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Diffstat (limited to 'sound/oss/vwsnd.c')
| -rw-r--r-- | sound/oss/vwsnd.c | 3506 |
1 files changed, 0 insertions, 3506 deletions
diff --git a/sound/oss/vwsnd.c b/sound/oss/vwsnd.c deleted file mode 100644 index a077e9c69a5e..000000000000 --- a/sound/oss/vwsnd.c +++ /dev/null @@ -1,3506 +0,0 @@ -/* - * Sound driver for Silicon Graphics 320 and 540 Visual Workstations' - * onboard audio. See notes in Documentation/sound/oss/vwsnd . - * - * Copyright 1999 Silicon Graphics, Inc. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#undef VWSND_DEBUG /* define for debugging */ - -/* - * XXX to do - - * - * External sync. - * Rename swbuf, hwbuf, u&i, hwptr&swptr to something rational. - * Bug - if select() called before read(), pcm_setup() not called. - * Bug - output doesn't stop soon enough if process killed. - */ - -/* - * Things to test - - * - * Will readv/writev work? Write a test. - * - * insmod/rmmod 100 million times. - * - * Run I/O until int ptrs wrap around (roughly 6.2 hours @ DAT - * rate). - * - * Concurrent threads banging on mixer simultaneously, both UP - * and SMP kernels. Especially, watch for thread A changing - * OUTSRC while thread B changes gain -- both write to the same - * ad1843 register. - * - * What happens if a client opens /dev/audio then forks? - * Do two procs have /dev/audio open? Test. - * - * Pump audio through the CD, MIC and line inputs and verify that - * they mix/mute into the output. - * - * Apps: - * amp - * mpg123 - * x11amp - * mxv - * kmedia - * esound - * need more input apps - * - * Run tests while bombarding with signals. setitimer(2) will do it... */ - -/* - * This driver is organized in nine sections. - * The nine sections are: - * - * debug stuff - * low level lithium access - * high level lithium access - * AD1843 access - * PCM I/O - * audio driver - * mixer driver - * probe/attach/unload - * initialization and loadable kernel module interface - * - * That is roughly the order of increasing abstraction, so forward - * dependencies are minimal. - */ - -/* - * Locking Notes - * - * INC_USE_COUNT and DEC_USE_COUNT keep track of the number of - * open descriptors to this driver. They store it in vwsnd_use_count. - * The global device list, vwsnd_dev_list, is immutable when the IN_USE - * is true. - * - * devc->open_lock is a semaphore that is used to enforce the - * single reader/single writer rule for /dev/audio. The rule is - * that each device may have at most one reader and one writer. - * Open will block until the previous client has closed the - * device, unless O_NONBLOCK is specified. - * - * The semaphore devc->io_mutex serializes PCM I/O syscalls. This - * is unnecessary in Linux 2.2, because the kernel lock - * serializes read, write, and ioctl globally, but it's there, - * ready for the brave, new post-kernel-lock world. - * - * Locking between interrupt and baselevel is handled by the - * "lock" spinlock in vwsnd_port (one lock each for read and - * write). Each half holds the lock just long enough to see what - * area it owns and update its pointers. See pcm_output() and - * pcm_input() for most of the gory stuff. - * - * devc->mix_mutex serializes all mixer ioctls. This is also - * redundant because of the kernel lock. - * - * The lowest level lock is lith->lithium_lock. It is a - * spinlock which is held during the two-register tango of - * reading/writing an AD1843 register. See - * li_{read,write}_ad1843_reg(). - */ - -/* - * Sample Format Notes - * - * Lithium's DMA engine has two formats: 16-bit 2's complement - * and 8-bit unsigned . 16-bit transfers the data unmodified, 2 - * bytes per sample. 8-bit unsigned transfers 1 byte per sample - * and XORs each byte with 0x80. Lithium can input or output - * either mono or stereo in either format. - * - * The AD1843 has four formats: 16-bit 2's complement, 8-bit - * unsigned, 8-bit mu-Law and 8-bit A-Law. - * - * This driver supports five formats: AFMT_S8, AFMT_U8, - * AFMT_MU_LAW, AFMT_A_LAW, and AFMT_S16_LE. - * - * For AFMT_U8 output, we keep the AD1843 in 16-bit mode, and - * rely on Lithium's XOR to translate between U8 and S8. - * - * For AFMT_S8, AFMT_MU_LAW and AFMT_A_LAW output, we have to XOR - * the 0x80 bit in software to compensate for Lithium's XOR. - * This happens in pcm_copy_{in,out}(). - * - * Changes: - * 11-10-2000 Bartlomiej Zolnierkiewicz <bkz@linux-ide.org> - * Added some __init/__exit - */ - -#include <linux/module.h> -#include <linux/init.h> - -#include <linux/spinlock.h> -#include <linux/wait.h> -#include <linux/interrupt.h> -#include <linux/mutex.h> -#include <linux/slab.h> -#include <linux/delay.h> - -#include <asm/visws/cobalt.h> - -#include "sound_config.h" - -static DEFINE_MUTEX(vwsnd_mutex); - -/*****************************************************************************/ -/* debug stuff */ - -#ifdef VWSND_DEBUG - -static int shut_up = 1; - -/* - * dbgassert - called when an assertion fails. - */ - -static void dbgassert(const char *fcn, int line, const char *expr) -{ - if (in_interrupt()) - panic("ASSERTION FAILED IN INTERRUPT, %s:%s:%d %s\n", - __FILE__, fcn, line, expr); - else { - int x; - printk(KERN_ERR "ASSERTION FAILED, %s:%s:%d %s\n", - __FILE__, fcn, line, expr); - x = * (volatile int *) 0; /* force proc to exit */ - } -} - -/* - * Bunch of useful debug macros: - * - * ASSERT - print unless e nonzero (panic if in interrupt) - * DBGDO - include arbitrary code if debugging - * DBGX - debug print raw (w/o function name) - * DBGP - debug print w/ function name - * DBGE - debug print function entry - * DBGC - debug print function call - * DBGR - debug print function return - * DBGXV - debug print raw when verbose - * DBGPV - debug print when verbose - * DBGEV - debug print function entry when verbose - * DBGRV - debug print function return when verbose - */ - -#define ASSERT(e) ((e) ? (void) 0 : dbgassert(__func__, __LINE__, #e)) -#define DBGDO(x) x -#define DBGX(fmt, args...) (in_interrupt() ? 0 : printk(KERN_ERR fmt, ##args)) -#define DBGP(fmt, args...) (DBGX("%s: " fmt, __func__ , ##args)) -#define DBGE(fmt, args...) (DBGX("%s" fmt, __func__ , ##args)) -#define DBGC(rtn) (DBGP("calling %s\n", rtn)) -#define DBGR() (DBGP("returning\n")) -#define DBGXV(fmt, args...) (shut_up ? 0 : DBGX(fmt, ##args)) -#define DBGPV(fmt, args...) (shut_up ? 0 : DBGP(fmt, ##args)) -#define DBGEV(fmt, args...) (shut_up ? 0 : DBGE(fmt, ##args)) -#define DBGCV(rtn) (shut_up ? 0 : DBGC(rtn)) -#define DBGRV() (shut_up ? 0 : DBGR()) - -#else /* !VWSND_DEBUG */ - -#define ASSERT(e) ((void) 0) -#define DBGDO(x) /* don't */ -#define DBGX(fmt, args...) ((void) 0) -#define DBGP(fmt, args...) ((void) 0) -#define DBGE(fmt, args...) ((void) 0) -#define DBGC(rtn) ((void) 0) -#define DBGR() ((void) 0) -#define DBGPV(fmt, args...) ((void) 0) -#define DBGXV(fmt, args...) ((void) 0) -#define DBGEV(fmt, args...) ((void) 0) -#define DBGCV(rtn) ((void) 0) -#define DBGRV() ((void) 0) - -#endif /* !VWSND_DEBUG */ - -/*****************************************************************************/ -/* low level lithium access */ - -/* - * We need to talk to Lithium registers on three pages. Here are - * the pages' offsets from the base address (0xFF001000). - */ - -enum { - LI_PAGE0_OFFSET = 0x01000 - 0x1000, /* FF001000 */ - LI_PAGE1_OFFSET = 0x0F000 - 0x1000, /* FF00F000 */ - LI_PAGE2_OFFSET = 0x10000 - 0x1000, /* FF010000 */ -}; - -/* low-level lithium data */ - -typedef struct lithium { - void * page0; /* virtual addresses */ - void * page1; - void * page2; - spinlock_t lock; /* protects codec and UST/MSC access */ -} lithium_t; - -/* - * li_destroy destroys the lithium_t structure and vm mappings. - */ - -static void li_destroy(lithium_t *lith) -{ - if (lith->page0) { - iounmap(lith->page0); - lith->page0 = NULL; - } - if (lith->page1) { - iounmap(lith->page1); - lith->page1 = NULL; - } - if (lith->page2) { - iounmap(lith->page2); - lith->page2 = NULL; - } -} - -/* - * li_create initializes the lithium_t structure and sets up vm mappings - * to access the registers. - * Returns 0 on success, -errno on failure. - */ - -static int __init li_create(lithium_t *lith, unsigned long baseaddr) -{ - spin_lock_init(&lith->lock); - lith->page0 = ioremap_nocache(baseaddr + LI_PAGE0_OFFSET, PAGE_SIZE); - lith->page1 = ioremap_nocache(baseaddr + LI_PAGE1_OFFSET, PAGE_SIZE); - lith->page2 = ioremap_nocache(baseaddr + LI_PAGE2_OFFSET, PAGE_SIZE); - if (!lith->page0 || !lith->page1 || !lith->page2) { - li_destroy(lith); - return -ENOMEM; - } - return 0; -} - -/* - * basic register accessors - read/write long/byte - */ - -static __inline__ unsigned long li_readl(lithium_t *lith, int off) -{ - return * (volatile unsigned long *) (lith->page0 + off); -} - -static __inline__ unsigned char li_readb(lithium_t *lith, int off) -{ - return * (volatile unsigned char *) (lith->page0 + off); -} - -static __inline__ void li_writel(lithium_t *lith, int off, unsigned long val) -{ - * (volatile unsigned long *) (lith->page0 + off) = val; -} - -static __inline__ void li_writeb(lithium_t *lith, int off, unsigned char val) -{ - * (volatile unsigned char *) (lith->page0 + off) = val; -} - -/*****************************************************************************/ -/* High Level Lithium Access */ - -/* - * Lithium DMA Notes - * - * Lithium has two dedicated DMA channels for audio. They are known - * as comm1 and comm2 (communication areas 1 and 2). Comm1 is for - * input, and comm2 is for output. Each is controlled by three - * registers: BASE (base address), CFG (config) and CCTL - * (config/control). - * - * Each DMA channel points to a physically contiguous ring buffer in - * main memory of up to 8 Kbytes. (This driver always uses 8 Kb.) - * There are three pointers into the ring buffer: read, write, and - * trigger. The pointers are 8 bits each. Each pointer points to - * 32-byte "chunks" of data. The DMA engine moves 32 bytes at a time, - * so there is no finer-granularity control. - * - * In comm1, the hardware updates the write ptr, and software updates - * the read ptr. In comm2, it's the opposite: hardware updates the - * read ptr, and software updates the write ptr. I designate the - * hardware-updated ptr as the hwptr, and the software-updated ptr as - * the swptr. - * - * The trigger ptr and trigger mask are used to trigger interrupts. - * From the Lithium spec, section 5.6.8, revision of 12/15/1998: - * - * Trigger Mask Value - * - * A three bit wide field that represents a power of two mask - * that is used whenever the trigger pointer is compared to its - * respective read or write pointer. A value of zero here - * implies a mask of 0xFF and a value of seven implies a mask - * 0x01. This value can be used to sub-divide the ring buffer - * into pie sections so that interrupts monitor the progress of - * hardware from section to section. - * - * My interpretation of that is, whenever the hw ptr is updated, it is - * compared with the trigger ptr, and the result is masked by the - * trigger mask. (Actually, by the complement of the trigger mask.) - * If the result is zero, an interrupt is triggered. I.e., interrupt - * if ((hwptr & ~mask) == (trptr & ~mask)). The mask is formed from - * the trigger register value as mask = (1 << (8 - tmreg)) - 1. - * - * In yet different words, setting tmreg to 0 causes an interrupt after - * every 256 DMA chunks (8192 bytes) or once per traversal of the - * ring buffer. Setting it to 7 caues an interrupt every 2 DMA chunks - * (64 bytes) or 128 times per traversal of the ring buffer. - */ - -/* Lithium register offsets and bit definitions */ - -#define LI_HOST_CONTROLLER 0x000 -# define LI_HC_RESET 0x00008000 -# define LI_HC_LINK_ENABLE 0x00004000 -# define LI_HC_LINK_FAILURE 0x00000004 -# define LI_HC_LINK_CODEC 0x00000002 -# define LI_HC_LINK_READY 0x00000001 - -#define LI_INTR_STATUS 0x010 -#define LI_INTR_MASK 0x014 -# define LI_INTR_LINK_ERR 0x00008000 -# define LI_INTR_COMM2_TRIG 0x00000008 -# define LI_INTR_COMM2_UNDERFLOW 0x00000004 -# define LI_INTR_COMM1_TRIG 0x00000002 -# define LI_INTR_COMM1_OVERFLOW 0x00000001 - -#define LI_CODEC_COMMAND 0x018 -# define LI_CC_BUSY 0x00008000 -# define LI_CC_DIR 0x00000080 -# define LI_CC_DIR_RD LI_CC_DIR -# define LI_CC_DIR_WR (!LI_CC_DIR) -# define LI_CC_ADDR_MASK 0x0000007F - -#define LI_CODEC_DATA 0x01C - -#define LI_COMM1_BASE 0x100 -#define LI_COMM1_CTL 0x104 -# define LI_CCTL_RESET 0x80000000 -# define LI_CCTL_SIZE 0x70000000 -# define LI_CCTL_DMA_ENABLE 0x08000000 -# define LI_CCTL_TMASK 0x07000000 /* trigger mask */ -# define LI_CCTL_TPTR 0x00FF0000 /* trigger pointer */ -# define LI_CCTL_RPTR 0x0000FF00 -# define LI_CCTL_WPTR 0x000000FF -#define LI_COMM1_CFG 0x108 -# define LI_CCFG_LOCK 0x00008000 -# define LI_CCFG_SLOT 0x00000070 -# define LI_CCFG_DIRECTION 0x00000008 -# define LI_CCFG_DIR_IN (!LI_CCFG_DIRECTION) -# define LI_CCFG_DIR_OUT LI_CCFG_DIRECTION -# define LI_CCFG_MODE 0x00000004 -# define LI_CCFG_MODE_MONO (!LI_CCFG_MODE) -# define LI_CCFG_MODE_STEREO LI_CCFG_MODE -# define LI_CCFG_FORMAT 0x00000003 -# define LI_CCFG_FMT_8BIT 0x00000000 -# define LI_CCFG_FMT_16BIT 0x00000001 -#define LI_COMM2_BASE 0x10C -#define LI_COMM2_CTL 0x110 - /* bit definitions are the same as LI_COMM1_CTL */ -#define LI_COMM2_CFG 0x114 - /* bit definitions are the same as LI_COMM1_CFG */ - -#define LI_UST_LOW 0x200 /* 64-bit Unadjusted System Time is */ -#define LI_UST_HIGH 0x204 /* microseconds since boot */ - -#define LI_AUDIO1_UST 0x300 /* UST-MSC pairs */ -#define LI_AUDIO1_MSC 0x304 /* MSC (Media Stream Counter) */ -#define LI_AUDIO2_UST 0x308 /* counts samples actually */ -#define LI_AUDIO2_MSC 0x30C /* processed as of time UST */ - -/* - * Lithium's DMA engine operates on chunks of 32 bytes. We call that - * a DMACHUNK. - */ - -#define DMACHUNK_SHIFT 5 -#define DMACHUNK_SIZE (1 << DMACHUNK_SHIFT) -#define BYTES_TO_CHUNKS(bytes) ((bytes) >> DMACHUNK_SHIFT) -#define CHUNKS_TO_BYTES(chunks) ((chunks) << DMACHUNK_SHIFT) - -/* - * Two convenient macros to shift bitfields into/out of position. - * - * Observe that (mask & -mask) is (1 << low_set_bit_of(mask)). - * As long as mask is constant, we trust the compiler will change the - * multiply and divide into shifts. - */ - -#define SHIFT_FIELD(val, mask) (((val) * ((mask) & -(mask))) & (mask)) -#define UNSHIFT_FIELD(val, mask) (((val) & (mask)) / ((mask) & -(mask))) - -/* - * dma_chan_desc is invariant information about a Lithium - * DMA channel. There are two instances, li_comm1 and li_comm2. - * - * Note that the CCTL register fields are write ptr and read ptr, but what - * we care about are which pointer is updated by software and which by - * hardware. - */ - -typedef struct dma_chan_desc { - int basereg; - int cfgreg; - int ctlreg; - int hwptrreg; - int swptrreg; - int ustreg; - int mscreg; - unsigned long swptrmask; - int ad1843_slot; - int direction; /* LI_CCTL_DIR_IN/OUT */ -} dma_chan_desc_t; - -static const dma_chan_desc_t li_comm1 = { - LI_COMM1_BASE, /* base register offset */ - LI_COMM1_CFG, /* config register offset */ - LI_COMM1_CTL, /* control register offset */ - LI_COMM1_CTL + 0, /* hw ptr reg offset (write ptr) */ - LI_COMM1_CTL + 1, /* sw ptr reg offset (read ptr) */ - LI_AUDIO1_UST, /* ust reg offset */ - LI_AUDIO1_MSC, /* msc reg offset */ - LI_CCTL_RPTR, /* sw ptr bitmask in ctlval */ - 2, /* ad1843 serial slot */ - LI_CCFG_DIR_IN /* direction */ -}; - -static const dma_chan_desc_t li_comm2 = { - LI_COMM2_BASE, /* base register offset */ - LI_COMM2_CFG, /* config register offset */ - LI_COMM2_CTL, /* control register offset */ - LI_COMM2_CTL + 1, /* hw ptr reg offset (read ptr) */ - LI_COMM2_CTL + 0, /* sw ptr reg offset (writr ptr) */ - LI_AUDIO2_UST, /* ust reg offset */ - LI_AUDIO2_MSC, /* msc reg offset */ - LI_CCTL_WPTR, /* sw ptr bitmask in ctlval */ - 2, /* ad1843 serial slot */ - LI_CCFG_DIR_OUT /* direction */ -}; - -/* - * dma_chan is variable information about a Lithium DMA channel. - * - * The desc field points to invariant information. - * The lith field points to a lithium_t which is passed - * to li_read* and li_write* to access the registers. - * The *val fields shadow the lithium registers' contents. - */ - -typedef struct dma_chan { - const dma_chan_desc_t *desc; - lithium_t *lith; - unsigned long baseval; - unsigned long cfgval; - unsigned long ctlval; -} dma_chan_t; - -/* - * ustmsc is a UST/MSC pair (Unadjusted System Time/Media Stream Counter). - * UST is time in microseconds since the system booted, and MSC is a - * counter that increments with every audio sample. - */ - -typedef struct ustmsc { - unsigned long long ust; - unsigned long msc; -} ustmsc_t; - -/* - * li_ad1843_wait waits until lithium says the AD1843 register - * exchange is not busy. Returns 0 on success, -EBUSY on timeout. - * - * Locking: must be called with lithium_lock held. - */ - -static int li_ad1843_wait(lithium_t *lith) -{ - unsigned long later = jiffies + 2; - while (li_readl(lith, LI_CODEC_COMMAND) & LI_CC_BUSY) - if (time_after_eq(jiffies, later)) - return -EBUSY; - return 0; -} - -/* - * li_read_ad1843_reg returns the current contents of a 16 bit AD1843 register. - * - * Returns unsigned register value on success, -errno on failure. - */ - -static int li_read_ad1843_reg(lithium_t *lith, int reg) -{ - int val; - - ASSERT(!in_interrupt()); - spin_lock(&lith->lock); - { - val = li_ad1843_wait(lith); - if (val == 0) { - li_writel(lith, LI_CODEC_COMMAND, LI_CC_DIR_RD | reg); - val = li_ad1843_wait(lith); - } - if (val == 0) - val = li_readl(lith, LI_CODEC_DATA); - } - spin_unlock(&lith->lock); - - DBGXV("li_read_ad1843_reg(lith=0x%p, reg=%d) returns 0x%04x\n", - lith, reg, val); - - return val; -} - -/* - * li_write_ad1843_reg writes the specified value to a 16 bit AD1843 register. - */ - -static void li_write_ad1843_reg(lithium_t *lith, int reg, int newval) -{ - spin_lock(&lith->lock); - { - if (li_ad1843_wait(lith) == 0) { - li_writel(lith, LI_CODEC_DATA, newval); - li_writel(lith, LI_CODEC_COMMAND, LI_CC_DIR_WR | reg); - } - } - spin_unlock(&lith->lock); -} - -/* - * li_setup_dma calculates all the register settings for DMA in a particular - * mode. It takes too many arguments. - */ - -static void li_setup_dma(dma_chan_t *chan, - const dma_chan_desc_t *desc, - lithium_t *lith, - unsigned long buffer_paddr, - int bufshift, - int fragshift, - int channels, - int sampsize) -{ - unsigned long mode, format; - unsigned long size, tmask; - - DBGEV("(chan=0x%p, desc=0x%p, lith=0x%p, buffer_paddr=0x%lx, " - "bufshift=%d, fragshift=%d, channels=%d, sampsize=%d)\n", - chan, desc, lith, buffer_paddr, - bufshift, fragshift, channels, sampsize); - - /* Reset the channel first. */ - - li_writel(lith, desc->ctlreg, LI_CCTL_RESET); - - ASSERT(channels == 1 || channels == 2); - if (channels == 2) - mode = LI_CCFG_MODE_STEREO; - else - mode = LI_CCFG_MODE_MONO; - ASSERT(sampsize == 1 || sampsize == 2); - if (sampsize == 2) - format = LI_CCFG_FMT_16BIT; - else - format = LI_CCFG_FMT_8BIT; - chan->desc = desc; - chan->lith = lith; - - /* - * Lithium DMA address register takes a 40-bit physical - * address, right-shifted by 8 so it fits in 32 bits. Bit 37 - * must be set -- it enables cache coherence. - */ - - ASSERT(!(buffer_paddr & 0xFF)); - chan->baseval = (buffer_paddr >> 8) | 1 << (37 - 8); - - chan->cfgval = ((chan->cfgval & ~LI_CCFG_LOCK) | - SHIFT_FIELD(desc->ad1843_slot, LI_CCFG_SLOT) | - desc->direction | - mode | - format); - - size = bufshift - 6; - tmask = 13 - fragshift; /* See Lithium DMA Notes above. */ - ASSERT(size >= 2 && size <= 7); - ASSERT(tmask >= 1 && tmask <= 7); - chan->ctlval = ((chan->ctlval & ~LI_CCTL_RESET) | - SHIFT_FIELD(size, LI_CCTL_SIZE) | - (chan->ctlval & ~LI_CCTL_DMA_ENABLE) | - SHIFT_FIELD(tmask, LI_CCTL_TMASK) | - SHIFT_FIELD(0, LI_CCTL_TPTR)); - - DBGPV("basereg 0x%x = 0x%lx\n", desc->basereg, chan->baseval); - DBGPV("cfgreg 0x%x = 0x%lx\n", desc->cfgreg, chan->cfgval); - DBGPV("ctlreg 0x%x = 0x%lx\n", desc->ctlreg, chan->ctlval); - - li_writel(lith, desc->basereg, chan->baseval); - li_writel(lith, desc->cfgreg, chan->cfgval); - li_writel(lith, desc->ctlreg, chan->ctlval); - - DBGRV(); -} - -static void li_shutdown_dma(dma_chan_t *chan) -{ - lithium_t *lith = chan->lith; - void * lith1 = lith->page1; - - DBGEV("(chan=0x%p)\n", chan); - - chan->ctlval &= ~LI_CCTL_DMA_ENABLE; - DBGPV("ctlreg 0x%x = 0x%lx\n", chan->desc->ctlreg, chan->ctlval); - li_writel(lith, chan->desc->ctlreg, chan->ctlval); - - /* - * Offset 0x500 on Lithium page 1 is an undocumented, - * unsupported register that holds the zero sample value. - * Lithium is supposed to output zero samples when DMA is - * inactive, and repeat the last sample when DMA underflows. - * But it has a bug, where, after underflow occurs, the zero - * sample is not reset. - * - * I expect this to break in a future rev of Lithium. - */ - - if (lith1 && chan->desc->direction == LI_CCFG_DIR_OUT) - * (volatile unsigned long *) (lith1 + 0x500) = 0; -} - -/* - * li_activate_dma always starts dma at the beginning of the buffer. - * - * N.B., these may be called from interrupt. - */ - -static __inline__ void li_activate_dma(dma_chan_t *chan) -{ - chan->ctlval |= LI_CCTL_DMA_ENABLE; - DBGPV("ctlval = 0x%lx\n", chan->ctlval); - li_writel(chan->lith, chan->desc->ctlreg, chan->ctlval); -} - -static void li_deactivate_dma(dma_chan_t *chan) -{ - lithium_t *lith = chan->lith; - void * lith2 = lith->page2; - - chan->ctlval &= ~(LI_CCTL_DMA_ENABLE | LI_CCTL_RPTR | LI_CCTL_WPTR); - DBGPV("ctlval = 0x%lx\n", chan->ctlval); - DBGPV("ctlreg 0x%x = 0x%lx\n", chan->desc->ctlreg, chan->ctlval); - li_writel(lith, chan->desc->ctlreg, chan->ctlval); - - /* - * Offsets 0x98 and 0x9C on Lithium page 2 are undocumented, - * unsupported registers that are internal copies of the DMA - * read and write pointers. Because of a Lithium bug, these - * registers aren't zeroed correctly when DMA is shut off. So - * we whack them directly. - * - * I expect this to break in a future rev of Lithium. - */ - - if (lith2 && chan->desc->direction == LI_CCFG_DIR_OUT) { - * (volatile unsigned long *) (lith2 + 0x98) = 0; - * (volatile unsigned long *) (lith2 + 0x9C) = 0; - } -} - -/* - * read/write the ring buffer pointers. These routines' arguments and results - * are byte offsets from the beginning of the ring buffer. - */ - -static __inline__ int li_read_swptr(dma_chan_t *chan) -{ - const unsigned long mask = chan->desc->swptrmask; - - return CHUNKS_TO_BYTES(UNSHIFT_FIELD(chan->ctlval, mask)); -} - -static __inline__ int li_read_hwptr(dma_chan_t *chan) -{ - return CHUNKS_TO_BYTES(li_readb(chan->lith, chan->desc->hwptrreg)); -} - -static __inline__ void li_write_swptr(dma_chan_t *chan, int val) -{ - const unsigned long mask = chan->desc->swptrmask; - - ASSERT(!(val & ~CHUNKS_TO_BYTES(0xFF))); - val = BYTES_TO_CHUNKS(val); - chan->ctlval = (chan->ctlval & ~mask) | SHIFT_FIELD(val, mask); - li_writeb(chan->lith, chan->desc->swptrreg, val); -} - -/* li_read_USTMSC() returns a UST/MSC pair for the given channel. */ - -static void li_read_USTMSC(dma_chan_t *chan, ustmsc_t *ustmsc) -{ - lithium_t *lith = chan->lith; - const dma_chan_desc_t *desc = chan->desc; - unsigned long now_low, now_high0, now_high1, chan_ust; - - spin_lock(&lith->lock); - { - /* - * retry until we do all five reads without the - * high word changing. (High word increments - * every 2^32 microseconds, i.e., not often) - */ - do { - now_high0 = li_readl(lith, LI_UST_HIGH); - now_low = li_readl(lith, LI_UST_LOW); - - /* - * Lithium guarantees these two reads will be - * atomic -- ust will not increment after msc - * is read. - */ - - ustmsc->msc = li_readl(lith, desc->mscreg); - chan_ust = li_readl(lith, desc->ustreg); - - now_high1 = li_readl(lith, LI_UST_HIGH); - } while (now_high0 != now_high1); - } - spin_unlock(&lith->lock); - ustmsc->ust = ((unsigned long long) now_high0 << 32 | chan_ust); -} - -static void li_enable_interrupts(lithium_t *lith, unsigned int mask) -{ - DBGEV("(lith=0x%p, mask=0x%x)\n", lith, mask); - - /* clear any already-pending interrupts. */ - - li_writel(lith, LI_INTR_STATUS, mask); - - /* enable the interrupts. */ - - mask |= li_readl(lith, LI_INTR_MASK); - li_writel(lith, LI_INTR_MASK, mask); -} - -static void li_disable_interrupts(lithium_t *lith, unsigned int mask) -{ - unsigned int keepmask; - - DBGEV("(lith=0x%p, mask=0x%x)\n", lith, mask); - - /* disable the interrupts */ - - keepmask = li_readl(lith, LI_INTR_MASK) & ~mask; - li_writel(lith, LI_INTR_MASK, keepmask); - - /* clear any pending interrupts. */ - - li_writel(lith, LI_INTR_STATUS, mask); -} - -/* Get the interrupt status and clear all pending interrupts. */ - -static unsigned int li_get_clear_intr_status(lithium_t *lith) -{ - unsigned int status; - - status = li_readl(lith, LI_INTR_STATUS); - li_writel(lith, LI_INTR_STATUS, ~0); - return status & li_readl(lith, LI_INTR_MASK); -} - -static int li_init(lithium_t *lith) -{ - /* 1. System power supplies stabilize. */ - - /* 2. Assert the ~RESET signal. */ - - li_writel(lith, LI_HOST_CONTROLLER, LI_HC_RESET); - udelay(1); - - /* 3. Deassert the ~RESET signal and enter a wait period to allow - the AD1843 internal clocks and the external crystal oscillator - to stabilize. */ - - li_writel(lith, LI_HOST_CONTROLLER, LI_HC_LINK_ENABLE); - udelay(1); - - return 0; -} - -/*****************************************************************************/ -/* AD1843 access */ - -/* - * AD1843 bitfield definitions. All are named as in the AD1843 data - * sheet, with ad1843_ prepended and individual bit numbers removed. - * - * E.g., bits LSS0 through LSS2 become ad1843_LSS. - * - * Only the bitfields we need are defined. - */ - -typedef struct ad1843_bitfield { - char reg; - char lo_bit; - char nbits; -} ad1843_bitfield_t; - -static const ad1843_bitfield_t - ad1843_PDNO = { 0, 14, 1 }, /* Converter Power-Down Flag */ - ad1843_INIT = { 0, 15, 1 }, /* Clock Initialization Flag */ - ad1843_RIG = { 2, 0, 4 }, /* Right ADC Input Gain */ - ad1843_RMGE = { 2, 4, 1 }, /* Right ADC Mic Gain Enable */ - ad1843_RSS = { 2, 5, 3 }, /* Right ADC Source Select */ - ad1843_LIG = { 2, 8, 4 }, /* Left ADC Input Gain */ - ad1843_LMGE = { 2, 12, 1 }, /* Left ADC Mic Gain Enable */ - ad1843_LSS = { 2, 13, 3 }, /* Left ADC Source Select */ - ad1843_RX1M = { 4, 0, 5 }, /* Right Aux 1 Mix Gain/Atten */ - ad1843_RX1MM = { 4, 7, 1 }, /* Right Aux 1 Mix Mute */ - ad1843_LX1M = { 4, 8, 5 }, /* Left Aux 1 Mix Gain/Atten */ - ad1843_LX1MM = { 4, 15, 1 }, /* Left Aux 1 Mix Mute */ - ad1843_RX2M = { 5, 0, 5 }, /* Right Aux 2 Mix Gain/Atten */ - ad1843_RX2MM = { 5, 7, 1 }, /* Right Aux 2 Mix Mute */ - ad1843_LX2M = { 5, 8, 5 }, /* Left Aux 2 Mix Gain/Atten */ - ad1843_LX2MM = { 5, 15, 1 }, /* Left Aux 2 Mix Mute */ - ad1843_RMCM = { 7, 0, 5 }, /* Right Mic Mix Gain/Atten */ - ad1843_RMCMM = { 7, 7, 1 }, /* Right Mic Mix Mute */ - ad1843_LMCM = { 7, 8, 5 }, /* Left Mic Mix Gain/Atten */ - ad1843_LMCMM = { 7, 15, 1 }, /* Left Mic Mix Mute */ - ad1843_HPOS = { 8, 4, 1 }, /* Headphone Output Voltage Swing */ - ad1843_HPOM = { 8, 5, 1 }, /* Headphone Output Mute */ - ad1843_RDA1G = { 9, 0, 6 }, /* Right DAC1 Analog/Digital Gain */ - ad1843_RDA1GM = { 9, 7, 1 }, /* Right DAC1 Analog Mute */ - ad1843_LDA1G = { 9, 8, 6 }, /* Left DAC1 Analog/Digital Gain */ - ad1843_LDA1GM = { 9, 15, 1 }, /* Left DAC1 Analog Mute */ - ad1843_RDA1AM = { 11, 7, 1 }, /* Right DAC1 Digital Mute */ - ad1843_LDA1AM = { 11, 15, 1 }, /* Left DAC1 Digital Mute */ - ad1843_ADLC = { 15, 0, 2 }, /* ADC Left Sample Rate Source */ - ad1843_ADRC = { 15, 2, 2 }, /* ADC Right Sample Rate Source */ - ad1843_DA1C = { 15, 8, 2 }, /* DAC1 Sample Rate Source */ - ad1843_C1C = { 17, 0, 16 }, /* Clock 1 Sample Rate Select */ - ad1843_C2C = { 20, 0, 16 }, /* Clock 1 Sample Rate Select */ - ad1843_DAADL = { 25, 4, 2 }, /* Digital ADC Left Source Select */ - ad1843_DAADR = { 25, 6, 2 }, /* Digital ADC Right Source Select */ - ad1843_DRSFLT = { 25, 15, 1 }, /* Digital Reampler Filter Mode */ - ad1843_ADLF = { 26, 0, 2 }, /* ADC Left Channel Data Format */ - ad1843_ADRF = { 26, 2, 2 }, /* ADC Right Channel Data Format */ - ad1843_ADTLK = { 26, 4, 1 }, /* ADC Transmit Lock Mode Select */ - ad1843_SCF = { 26, 7, 1 }, /* SCLK Frequency Select */ - ad1843_DA1F = { 26, 8, 2 }, /* DAC1 Data Format Select */ - ad1843_DA1SM = { 26, 14, 1 }, /* DAC1 Stereo/Mono Mode Select */ - ad1843_ADLEN = { 27, 0, 1 }, /* ADC Left Channel Enable */ - ad1843_ADREN = { 27, 1, 1 }, /* ADC Right Channel Enable */ - ad1843_AAMEN = { 27, 4, 1 }, /* Analog to Analog Mix Enable */ - ad1843_ANAEN = { 27, 7, 1 }, /* Analog Channel Enable */ - ad1843_DA1EN = { 27, 8, 1 }, /* DAC1 Enable */ - ad1843_DA2EN = { 27, 9, 1 }, /* DAC2 Enable */ - ad1843_C1EN = { 28, 11, 1 }, /* Clock Generator 1 Enable */ - ad1843_C2EN = { 28, 12, 1 }, /* Clock Generator 2 Enable */ - ad1843_PDNI = { 28, 15, 1 }; /* Converter Power Down */ - -/* - * The various registers of the AD1843 use three different formats for - * specifying gain. The ad1843_gain structure parameterizes the - * formats. - */ - -typedef struct ad1843_gain { - - int negative; /* nonzero if gain is negative. */ - const ad1843_bitfield_t *lfield; - const ad1843_bitfield_t *rfield; - -} ad1843_gain_t; - -static const ad1843_gain_t ad1843_gain_RECLEV - = { 0, &ad1843_LIG, &ad1843_RIG }; -static const ad1843_gain_t ad1843_gain_LINE - = { 1, &ad1843_LX1M, &ad1843_RX1M }; -static const ad1843_gain_t ad1843_gain_CD - = { 1, &ad1843_LX2M, &ad1843_RX2M }; -static const ad1843_gain_t ad1843_gain_MIC - = { 1, &ad1843_LMCM, &ad1843_RMCM }; -static const ad1843_gain_t ad1843_gain_PCM - = { 1, &ad1843_LDA1G, &ad1843_RDA1G }; - -/* read the current value of an AD1843 bitfield. */ - -static int ad1843_read_bits(lithium_t *lith, const ad1843_bitfield_t *field) -{ - int w = li_read_ad1843_reg(lith, field->reg); - int val = w >> field->lo_bit & ((1 << field->nbits) - 1); - - DBGXV("ad1843_read_bits(lith=0x%p, field->{%d %d %d}) returns 0x%x\n", - lith, field->reg, field->lo_bit, field->nbits, val); - - return val; -} - -/* - * write a new value to an AD1843 bitfield and return the old value. - */ - -static int ad1843_write_bits(lithium_t *lith, - const ad1843_bitfield_t *field, - int newval) -{ - int w = li_read_ad1843_reg(lith, field->reg); - int mask = ((1 << field->nbits) - 1) << field->lo_bit; - int oldval = (w & mask) >> field->lo_bit; - int newbits = (newval << field->lo_bit) & mask; - w = (w & ~mask) | newbits; - (void) li_write_ad1843_reg(lith, field->reg, w); - - DBGXV("ad1843_write_bits(lith=0x%p, field->{%d %d %d}, val=0x%x) " - "returns 0x%x\n", - lith, field->reg, field->lo_bit, field->nbits, newval, - oldval); - - return oldval; -} - -/* - * ad1843_read_multi reads multiple bitfields from the same AD1843 - * register. It uses a single read cycle to do it. (Reading the - * ad1843 requires 256 bit times at 12.288 MHz, or nearly 20 - * microseconds.) - * - * Called ike this. - * - * ad1843_read_multi(lith, nfields, - * &ad1843_FIELD1, &val1, - * &ad1843_FIELD2, &val2, ...); - */ - -static void ad1843_read_multi(lithium_t *lith, int argcount, ...) -{ - va_list ap; - const ad1843_bitfield_t *fp; - int w = 0, mask, *value, reg = -1; - - va_start(ap, argcount); - while (--argcount >= 0) { - fp = va_arg(ap, const ad1843_bitfield_t *); - value = va_arg(ap, int *); - if (reg == -1) { - reg = fp->reg; - w = li_read_ad1843_reg(lith, reg); - } - ASSERT(reg == fp->reg); - mask = (1 << fp->nbits) - 1; - *value = w >> fp->lo_bit & mask; - } - va_end(ap); -} - -/* - * ad1843_write_multi stores multiple bitfields into the same AD1843 - * register. It uses one read and one write cycle to do it. - * - * Called like this. - * - * ad1843_write_multi(lith, nfields, - * &ad1843_FIELD1, val1, - * &ad1843_FIELF2, val2, ...); - */ - -static void ad1843_write_multi(lithium_t *lith, int argcount, ...) -{ - va_list ap; - int reg; - const ad1843_bitfield_t *fp; - int value; - int w, m, mask, bits; - - mask = 0; - bits = 0; - reg = -1; - - va_start(ap, argcount); - while (--argcount >= 0) { - fp = va_arg(ap, const ad1843_bitfield_t *); - value = va_arg(ap, int); - if (reg == -1) - reg = fp->reg; - ASSERT(fp->reg == reg); - m = ((1 << fp->nbits) - 1) << fp->lo_bit; - mask |= m; - bits |= (value << fp->lo_bit) & m; - } - va_end(ap); - ASSERT(!(bits & ~mask)); - if (~mask & 0xFFFF) - w = li_read_ad1843_reg(lith, reg); - else - w = 0; - w = (w & ~mask) | bits; - (void) li_write_ad1843_reg(lith, reg, w); -} - -/* - * ad1843_get_gain reads the specified register and extracts the gain value - * using the supplied gain type. It returns the gain in OSS format. - */ - -static int ad1843_get_gain(lithium_t *lith, const ad1843_gain_t *gp) -{ - int lg, rg; - unsigned short mask = (1 << gp->lfield->nbits) - 1; - - ad1843_read_multi(lith, 2, gp->lfield, &lg, gp->rfield, &rg); - if (gp->negative) { - lg = mask - lg; - rg = mask - rg; - } - lg = (lg * 100 + (mask >> 1)) / mask; - rg = (rg * 100 + (mask >> 1)) / mask; - return lg << 0 | rg << 8; -} - -/* - * Set an audio channel's gain. Converts from OSS format to AD1843's - * format. - * - * Returns the new gain, which may be lower than the old gain. - */ - -static int ad1843_set_gain(lithium_t *lith, - const ad1843_gain_t *gp, - int newval) -{ - unsigned short mask = (1 << gp->lfield->nbits) - 1; - - int lg = newval >> 0 & 0xFF; - int rg = newval >> 8; - if (lg < 0 || lg > 100 || rg < 0 || rg > 100) - return -EINVAL; - lg = (lg * mask + (mask >> 1)) / 100; - rg = (rg * mask + (mask >> 1)) / 100; - if (gp->negative) { - lg = mask - lg; - rg = mask - rg; - } - ad1843_write_multi(lith, 2, gp->lfield, lg, gp->rfield, rg); - return ad1843_get_gain(lith, gp); -} - -/* Returns the current recording source, in OSS format. */ - -static int ad1843_get_recsrc(lithium_t *lith) -{ - int ls = ad1843_read_bits(lith, &ad1843_LSS); - - switch (ls) { - case 1: - return SOUND_MASK_MIC; - case 2: - return SOUND_MASK_LINE; - case 3: - return SOUND_MASK_CD; - case 6: - return SOUND_MASK_PCM; - default: - ASSERT(0); - return -1; - } -} - -/* - * Enable/disable digital resample mode in the AD1843. - * - * The AD1843 requires that ADL, ADR, DA1 and DA2 be powered down - * while switching modes. So we save DA1's state (DA2's state is not - * interesting), power them down, switch into/out of resample mode, - * power them up, and restore state. - * - * This will cause audible glitches if D/A or A/D is going on, so the - * driver disallows that (in mixer_write_ioctl()). - * - * The open question is, is this worth doing? I'm leaving it in, - * because it's written, but... - */ - -static void ad1843_set_resample_mode(lithium_t *lith, int onoff) -{ - /* Save DA1 mute and gain (addr 9 is DA1 analog gain/attenuation) */ - int save_da1 = li_read_ad1843_reg(lith, 9); - - /* Power down A/D and D/A. */ - ad1843_write_multi(lith, 4, - &ad1843_DA1EN, 0, - &ad1843_DA2EN, 0, - &ad1843_ADLEN, 0, - &ad1843_ADREN, 0); - - /* Switch mode */ - ASSERT(onoff == 0 || onoff == 1); - ad1843_write_bits(lith, &ad1843_DRSFLT, onoff); - - /* Power up A/D and D/A. */ - ad1843_write_multi(lith, 3, - &ad1843_DA1EN, 1, - &ad1843_ADLEN, 1, - &ad1843_ADREN, 1); - - /* Restore DA1 mute and gain. */ - li_write_ad1843_reg(lith, 9, save_da1); -} - -/* - * Set recording source. Arg newsrc specifies an OSS channel mask. - * - * The complication is that when we switch into/out of loopback mode - * (i.e., src = SOUND_MASK_PCM), we change the AD1843 into/out of - * digital resampling mode. - * - * Returns newsrc on success, -errno on failure. - */ - -static int ad1843_set_recsrc(lithium_t *lith, int newsrc) -{ - int bits; - int oldbits; - - switch (newsrc) { - case SOUND_MASK_PCM: - bits = 6; - break; - - case SOUND_MASK_MIC: - bits = 1; - break; - - case SOUND_MASK_LINE: - bits = 2; - break; - - case SOUND_MASK_CD: - bits = 3; - break; - - default: - return -EINVAL; - } - oldbits = ad1843_read_bits(lith, &ad1843_LSS); - if (newsrc == SOUND_MASK_PCM && oldbits != 6) { - DBGP("enabling digital resample mode\n"); - ad1843_set_resample_mode(lith, 1); - ad1843_write_multi(lith, 2, - &ad1843_DAADL, 2, - &ad1843_DAADR, 2); - } else if (newsrc != SOUND_MASK_PCM && oldbits == 6) { - DBGP("disabling digital resample mode\n"); - ad1843_set_resample_mode(lith, 0); - ad1843_write_multi(lith, 2, - &ad1843_DAADL, 0, - &ad1843_DAADR, 0); - } - ad1843_write_multi(lith, 2, &ad1843_LSS, bits, &ad1843_RSS, bits); - return newsrc; -} - -/* - * Return current output sources, in OSS format. - */ - -static int ad1843_get_outsrc(lithium_t *lith) -{ - int pcm, line, mic, cd; - - pcm = ad1843_read_bits(lith, &ad1843_LDA1GM) ? 0 : SOUND_MASK_PCM; - line = ad1843_read_bits(lith, &ad1843_LX1MM) ? 0 : SOUND_MASK_LINE; - cd = ad1843_read_bits(lith, &ad1843_LX2MM) ? 0 : SOUND_MASK_CD; - mic = ad1843_read_bits(lith, &ad1843_LMCMM) ? 0 : SOUND_MASK_MIC; - - return pcm | line | cd | mic; -} - -/* - * Set output sources. Arg is a mask of active sources in OSS format. - * - * Returns source mask on success, -errno on failure. - */ - -static int ad1843_set_outsrc(lithium_t *lith, int mask) -{ - int pcm, line, mic, cd; - - if (mask & ~(SOUND_MASK_PCM | SOUND_MASK_LINE | - SOUND_MASK_CD | SOUND_MASK_MIC)) - return -EINVAL; - pcm = (mask & SOUND_MASK_PCM) ? 0 : 1; - line = (mask & SOUND_MASK_LINE) ? 0 : 1; - mic = (mask & SOUND_MASK_MIC) ? 0 : 1; - cd = (mask & SOUND_MASK_CD) ? 0 : 1; - - ad1843_write_multi(lith, 2, &ad1843_LDA1GM, pcm, &ad1843_RDA1GM, pcm); - ad1843_write_multi(lith, 2, &ad1843_LX1MM, line, &ad1843_RX1MM, line); - ad1843_write_multi(lith, 2, &ad1843_LX2MM, cd, &ad1843_RX2MM, cd); - ad1843_write_multi(lith, 2, &ad1843_LMCMM, mic, &ad1843_RMCMM, mic); - - return mask; -} - -/* Setup ad1843 for D/A conversion. */ - -static void ad1843_setup_dac(lithium_t *lith, - int framerate, - int fmt, - int channels) -{ - int ad_fmt = 0, ad_mode = 0; - - DBGEV("(lith=0x%p, framerate=%d, fmt=%d, channels=%d)\n", - lith, framerate, fmt, channels); - - switch (fmt) { - case AFMT_S8: ad_fmt = 1; break; - case AFMT_U8: ad_fmt = 1; break; - case AFMT_S16_LE: ad_fmt = 1; break; - case AFMT_MU_LAW: ad_fmt = 2; break; - case AFMT_A_LAW: ad_fmt = 3; break; - default: ASSERT(0); - } - - switch (channels) { - case 2: ad_mode = 0; break; - case 1: ad_mode = 1; break; - default: ASSERT(0); - } - - DBGPV("ad_mode = %d, ad_fmt = %d\n", ad_mode, ad_fmt); - ASSERT(framerate >= 4000 && framerate <= 49000); - ad1843_write_bits(lith, &ad1843_C1C, framerate); - ad1843_write_multi(lith, 2, - &ad1843_DA1SM, ad_mode, &ad1843_DA1F, ad_fmt); -} - -static void ad1843_shutdown_dac(lithium_t *lith) -{ - ad1843_write_bits(lith, &ad1843_DA1F, 1); -} - -static void ad1843_setup_adc(lithium_t *lith, int framerate, int fmt, int channels) -{ - int da_fmt = 0; - - DBGEV("(lith=0x%p, framerate=%d, fmt=%d, channels=%d)\n", - lith, framerate, fmt, channels); - - switch (fmt) { - case AFMT_S8: da_fmt = 1; break; - case AFMT_U8: da_fmt = 1; break; - case AFMT_S16_LE: da_fmt = 1; break; - case AFMT_MU_LAW: da_fmt = 2; break; - case AFMT_A_LAW: da_fmt = 3; break; - default: ASSERT(0); - } - - DBGPV("da_fmt = %d\n", da_fmt); - ASSERT(framerate >= 4000 && framerate <= 49000); - ad1843_write_bits(lith, &ad1843_C2C, framerate); - ad1843_write_multi(lith, 2, - &ad1843_ADLF, da_fmt, &ad1843_ADRF, da_fmt); -} - -static void ad1843_shutdown_adc(lithium_t *lith) -{ - /* nothing to do */ -} - -/* - * Fully initialize the ad1843. As described in the AD1843 data - * sheet, section "START-UP SEQUENCE". The numbered comments are - * subsection headings from the data sheet. See the data sheet, pages - * 52-54, for more info. - * - * return 0 on success, -errno on failure. */ - -static int __init ad1843_init(lithium_t *lith) -{ - unsigned long later; - int err; - - err = li_init(lith); - if (err) - return err; - - if (ad1843_read_bits(lith, &ad1843_INIT) != 0) { - printk(KERN_ERR "vwsnd sound: AD1843 won't initialize\n"); - return -EIO; - } - - ad1843_write_bits(lith, &ad1843_SCF, 1); - - /* 4. Put the conversion resources into standby. */ - - ad1843_write_bits(lith, &ad1843_PDNI, 0); - later = jiffies + HZ / 2; /* roughly half a second */ - DBGDO(shut_up++); - while (ad1843_read_bits(lith, &ad1843_PDNO)) { - if (time_after(jiffies, later)) { - printk(KERN_ERR - "vwsnd audio: AD1843 won't power up\n"); - return -EIO; - } - schedule(); - } - DBGDO(shut_up--); - - /* 5. Power up the clock generators and enable clock output pins. */ - - ad1843_write_multi(lith, 2, &ad1843_C1EN, 1, &ad1843_C2EN, 1); - - /* 6. Configure conversion resources while they are in standby. */ - - /* DAC1 uses clock 1 as source, ADC uses clock 2. Always. */ - - ad1843_write_multi(lith, 3, - &ad1843_DA1C, 1, - &ad1843_ADLC, 2, - &ad1843_ADRC, 2); - - /* 7. Enable conversion resources. */ - - ad1843_write_bits(lith, &ad1843_ADTLK, 1); - ad1843_write_multi(lith, 5, - &ad1843_ANAEN, 1, - &ad1843_AAMEN, 1, - &ad1843_DA1EN, 1, - &ad1843_ADLEN, 1, - &ad1843_ADREN, 1); - - /* 8. Configure conversion resources while they are enabled. */ - - ad1843_write_bits(lith, &ad1843_DA1C, 1); - - /* Unmute all channels. */ - - ad1843_set_outsrc(lith, - (SOUND_MASK_PCM | SOUND_MASK_LINE | - SOUND_MASK_MIC | SOUND_MASK_CD)); - ad1843_write_multi(lith, 2, &ad1843_LDA1AM, 0, &ad1843_RDA1AM, 0); - - /* Set default recording source to Line In and set - * mic gain to +20 dB. - */ - - ad1843_set_recsrc(lith, SOUND_MASK_LINE); - ad1843_write_multi(lith, 2, &ad1843_LMGE, 1, &ad1843_RMGE, 1); - - /* Set Speaker Out level to +/- 4V and unmute it. */ - - ad1843_write_multi(lith, 2, &ad1843_HPOS, 1, &ad1843_HPOM, 0); - - return 0; -} - -/*****************************************************************************/ -/* PCM I/O */ - -#define READ_INTR_MASK (LI_INTR_COMM1_TRIG | LI_INTR_COMM1_OVERFLOW) -#define WRITE_INTR_MASK (LI_INTR_COMM2_TRIG | LI_INTR_COMM2_UNDERFLOW) - -typedef enum vwsnd_port_swstate { /* software state */ - SW_OFF, - SW_INITIAL, - SW_RUN, - SW_DRAIN, -} vwsnd_port_swstate_t; - -typedef enum vwsnd_port_hwstate { /* hardware state */ - HW_STOPPED, - HW_RUNNING, -} vwsnd_port_hwstate_t; - -/* - * These flags are read by ISR, but only written at baseline. - */ - -typedef enum vwsnd_port_flags { - DISABLED = 1 << 0, - ERFLOWN = 1 << 1, /* overflown or underflown */ - HW_BUSY = 1 << 2, -} vwsnd_port_flags_t; - -/* - * vwsnd_port is the per-port data structure. Each device has two - * ports, one for input and one for output. - * - * Locking: - * - * port->lock protects: hwstate, flags, swb_[iu]_avail. - * - * devc->io_mutex protects: swstate, sw_*, swb_[iu]_idx. - * - * everything else is only written by open/release or - * pcm_{setup,shutdown}(), which are serialized by a - * combination of devc->open_mutex and devc->io_mutex. - */ - -typedef struct vwsnd_port { - - spinlock_t lock; - wait_queue_head_t queue; - vwsnd_port_swstate_t swstate; - vwsnd_port_hwstate_t hwstate; - vwsnd_port_flags_t flags; - - int sw_channels; - int sw_samplefmt; - int sw_framerate; - int sample_size; - int frame_size; - unsigned int zero_word; /* zero for the sample format */ - - int sw_fragshift; - int sw_fragcount; - int sw_subdivshift; - - unsigned int hw_fragshift; - unsigned int hw_fragsize; - unsigned int hw_fragcount; - - int hwbuf_size; - unsigned long hwbuf_paddr; - unsigned long hwbuf_vaddr; - void * hwbuf; /* hwbuf == hwbuf_vaddr */ - int hwbuf_max; /* max bytes to preload */ - - void * swbuf; - unsigned int swbuf_size; /* size in bytes */ - unsigned int swb_u_idx; /* index of next user byte */ - unsigned int swb_i_idx; /* index of next intr byte */ - unsigned int swb_u_avail; /* # bytes avail to user */ - unsigned int swb_i_avail; /* # bytes avail to intr */ - - dma_chan_t chan; - - /* Accounting */ - - int byte_count; - int frag_count; - int MSC_offset; - -} vwsnd_port_t; - -/* vwsnd_dev is the per-device data structure. */ - -typedef struct vwsnd_dev { - struct vwsnd_dev *next_dev; - int audio_minor; /* minor number of audio device */ - int mixer_minor; /* minor number of mixer device */ - - struct mutex open_mutex; - struct mutex io_mutex; - struct mutex mix_mutex; - fmode_t open_mode; - wait_queue_head_t open_wait; - - lithium_t lith; - - vwsnd_port_t rport; - vwsnd_port_t wport; -} vwsnd_dev_t; - -static vwsnd_dev_t *vwsnd_dev_list; /* linked list of all devices */ - -static atomic_t vwsnd_use_count = ATOMIC_INIT(0); - -# define INC_USE_COUNT (atomic_inc(&vwsnd_use_count)) -# define DEC_USE_COUNT (atomic_dec(&vwsnd_use_count)) -# define IN_USE (atomic_read(&vwsnd_use_count) != 0) - -/* - * Lithium can only DMA multiples of 32 bytes. Its DMA buffer may - * be up to 8 Kb. This driver always uses 8 Kb. - * - * Memory bug workaround -- I'm not sure what's going on here, but - * somehow pcm_copy_out() was triggering segv's going on to the next - * page of the hw buffer. So, I make the hw buffer one size bigger - * than we actually use. That way, the following page is allocated - * and mapped, and no error. I suspect that something is broken - * in Cobalt, but haven't really investigated. HBO is the actual - * size of the buffer, and HWBUF_ORDER is what we allocate. - */ - -#define HWBUF_SHIFT 13 -#define HWBUF_SIZE (1 << HWBUF_SHIFT) -# define HBO (HWBUF_SHIFT > PAGE_SHIFT ? HWBUF_SHIFT - PAGE_SHIFT : 0) -# define HWBUF_ORDER (HBO + 1) /* next size bigger */ -#define MIN_SPEED 4000 -#define MAX_SPEED 49000 - -#define MIN_FRAGSHIFT (DMACHUNK_SHIFT + 1) -#define MAX_FRAGSHIFT (PAGE_SHIFT) -#define MIN_FRAGSIZE (1 << MIN_FRAGSHIFT) -#define MAX_FRAGSIZE (1 << MAX_FRAGSHIFT) -#define MIN_FRAGCOUNT(fragsize) 3 -#define MAX_FRAGCOUNT(fragsize) (32 * PAGE_SIZE / (fragsize)) -#define DEFAULT_FRAGSHIFT 12 -#define DEFAULT_FRAGCOUNT 16 -#define DEFAULT_SUBDIVSHIFT 0 - -/* - * The software buffer (swbuf) is a ring buffer shared between user - * level and interrupt level. Each level owns some of the bytes in - * the buffer, and may give bytes away by calling swb_inc_{u,i}(). - * User level calls _u for user, and interrupt level calls _i for - * interrupt. - * - * port->swb_{u,i}_avail is the number of bytes available to that level. - * - * port->swb_{u,i}_idx is the index of the first available byte in the - * buffer. - * - * Each level calls swb_inc_{u,i}() to atomically increment its index, - * recalculate the number of bytes available for both sides, and - * return the number of bytes available. Since each side can only - * give away bytes, the other side can only increase the number of - * bytes available to this side. Each side updates its own index - * variable, swb_{u,i}_idx, so no lock is needed to read it. - * - * To query the number of bytes available, call swb_inc_{u,i} with an - * increment of zero. - */ - -static __inline__ unsigned int __swb_inc_u(vwsnd_port_t *port, int inc) -{ - if (inc) { - port->swb_u_idx += inc; - port->swb_u_idx %= port->swbuf_size; - port->swb_u_avail -= inc; - port->swb_i_avail += inc; - } - return port->swb_u_avail; -} - -static __inline__ unsigned int swb_inc_u(vwsnd_port_t *port, int inc) -{ - unsigned long flags; - unsigned int ret; - - spin_lock_irqsave(&port->lock, flags); - { - ret = __swb_inc_u(port, inc); - } - spin_unlock_irqrestore(&port->lock, flags); - return ret; -} - -static __inline__ unsigned int __swb_inc_i(vwsnd_port_t *port, int inc) -{ - if (inc) { - port->swb_i_idx += inc; - port->swb_i_idx %= port->swbuf_size; - port->swb_i_avail -= inc; - port->swb_u_avail += inc; - } - return port->swb_i_avail; -} - -static __inline__ unsigned int swb_inc_i(vwsnd_port_t *port, int inc) -{ - unsigned long flags; - unsigned int ret; - - spin_lock_irqsave(&port->lock, flags); - { - ret = __swb_inc_i(port, inc); - } - spin_unlock_irqrestore(&port->lock, flags); - return ret; -} - -/* - * pcm_setup - this routine initializes all port state after - * mode-setting ioctls have been done, but before the first I/O is - * done. - * - * Locking: called with devc->io_mutex held. - * - * Returns 0 on success, -errno on failure. - */ - -static int pcm_setup(vwsnd_dev_t *devc, - vwsnd_port_t *rport, - vwsnd_port_t *wport) -{ - vwsnd_port_t *aport = rport ? rport : wport; - int sample_size; - unsigned int zero_word; - - DBGEV("(devc=0x%p, rport=0x%p, wport=0x%p)\n", devc, rport, wport); - - ASSERT(aport != NULL); - if (aport->swbuf != NULL) - return 0; - switch (aport->sw_samplefmt) { - case AFMT_MU_LAW: - sample_size = 1; - zero_word = 0xFFFFFFFF ^ 0x80808080; - break; - - case AFMT_A_LAW: - sample_size = 1; - zero_word = 0xD5D5D5D5 ^ 0x80808080; - break; - - case AFMT_U8: - sample_size = 1; - zero_word = 0x80808080; - break; - - case AFMT_S8: - sample_size = 1; - zero_word = 0x00000000; - break; - - case AFMT_S16_LE: - sample_size = 2; - zero_word = 0x00000000; - break; - - default: - sample_size = 0; /* prevent compiler warning */ - zero_word = 0; - ASSERT(0); - } - aport->sample_size = sample_size; - aport->zero_word = zero_word; - aport->frame_size = aport->sw_channels * aport->sample_size; - aport->hw_fragshift = aport->sw_fragshift - aport->sw_subdivshift; - aport->hw_fragsize = 1 << aport->hw_fragshift; - aport->hw_fragcount = aport->sw_fragcount << aport->sw_subdivshift; - ASSERT(aport->hw_fragsize >= MIN_FRAGSIZE); - ASSERT(aport->hw_fragsize <= MAX_FRAGSIZE); - ASSERT(aport->hw_fragcount >= MIN_FRAGCOUNT(aport->hw_fragsize)); - ASSERT(aport->hw_fragcount <= MAX_FRAGCOUNT(aport->hw_fragsize)); - if (rport) { - int hwfrags, swfrags; - rport->hwbuf_max = aport->hwbuf_size - DMACHUNK_SIZE; - hwfrags = rport->hwbuf_max >> aport->hw_fragshift; - swfrags = aport->hw_fragcount - hwfrags; - if (swfrags < 2) - swfrags = 2; - rport->swbuf_size = swfrags * aport->hw_fragsize; - DBGPV("hwfrags = %d, swfrags = %d\n", hwfrags, swfrags); - DBGPV("read hwbuf_max = %d, swbuf_size = %d\n", - rport->hwbuf_max, rport->swbuf_size); - } - if (wport) { - int hwfrags, swfrags; - int total_bytes = aport->hw_fragcount * aport->hw_fragsize; - wport->hwbuf_max = aport->hwbuf_size - DMACHUNK_SIZE; - if (wport->hwbuf_max > total_bytes) - wport->hwbuf_max = total_bytes; - hwfrags = wport->hwbuf_max >> aport->hw_fragshift; - DBGPV("hwfrags = %d\n", hwfrags); - swfrags = aport->hw_fragcount - hwfrags; - if (swfrags < 2) - swfrags = 2; - wport->swbuf_size = swfrags * aport->hw_fragsize; - DBGPV("hwfrags = %d, swfrags = %d\n", hwfrags, swfrags); - DBGPV("write hwbuf_max = %d, swbuf_size = %d\n", - wport->hwbuf_max, wport->swbuf_size); - } - - aport->swb_u_idx = 0; - aport->swb_i_idx = 0; - aport->byte_count = 0; - - /* - * Is this a Cobalt bug? We need to make this buffer extend - * one page further than we actually use -- somehow memcpy - * causes an exceptoin otherwise. I suspect there's a bug in - * Cobalt (or somewhere) where it's generating a fault on a - * speculative load or something. Obviously, I haven't taken - * the time to track it down. - */ - - aport->swbuf = vmalloc(aport->swbuf_size + PAGE_SIZE); - if (!aport->swbuf) - return -ENOMEM; - if (rport && wport) { - ASSERT(aport == rport); - ASSERT(wport->swbuf == NULL); - /* One extra page - see comment above. */ - wport->swbuf = vmalloc(aport->swbuf_size + PAGE_SIZE); - if (!wport->swbuf) { - vfree(aport->swbuf); - aport->swbuf = NULL; - return -ENOMEM; - } - wport->sample_size = rport->sample_size; - wport->zero_word = rport->zero_word; - wport->frame_size = rport->frame_size; - wport->hw_fragshift = rport->hw_fragshift; - wport->hw_fragsize = rport->hw_fragsize; - wport->hw_fragcount = rport->hw_fragcount; - wport->swbuf_size = rport->swbuf_size; - wport->hwbuf_max = rport->hwbuf_max; - wport->swb_u_idx = rport->swb_u_idx; - wport->swb_i_idx = rport->swb_i_idx; - wport->byte_count = rport->byte_count; - } - if (rport) { - rport->swb_u_avail = 0; - rport->swb_i_avail = rport->swbuf_size; - rport->swstate = SW_RUN; - li_setup_dma(&rport->chan, - &li_comm1, - &devc->lith, - rport->hwbuf_paddr, - HWBUF_SHIFT, - rport->hw_fragshift, - rport->sw_channels, - rport->sample_size); - ad1843_setup_adc(&devc->lith, - rport->sw_framerate, - rport->sw_samplefmt, - rport->sw_channels); - li_enable_interrupts(&devc->lith, READ_INTR_MASK); - if (!(rport->flags & DISABLED)) { - ustmsc_t ustmsc; - rport->hwstate = HW_RUNNING; - li_activate_dma(&rport->chan); - li_read_USTMSC(&rport->chan, &ustmsc); - rport->MSC_offset = ustmsc.msc; - } - } - if (wport) { - if (wport->hwbuf_max > wport->swbuf_size) - wport->hwbuf_max = wport->swbuf_size; - wport->flags &= ~ERFLOWN; - wport->swb_u_avail = wport->swbuf_size; - wport->swb_i_avail = 0; - wport->swstate = SW_RUN; - li_setup_dma(&wport->chan, - &li_comm2, - &devc->lith, - wport->hwbuf_paddr, - HWBUF_SHIFT, - wport->hw_fragshift, - wport->sw_channels, - wport->sample_size); - ad1843_setup_dac(&devc->lith, - wport->sw_framerate, - wport->sw_samplefmt, - wport->sw_channels); - li_enable_interrupts(&devc->lith, WRITE_INTR_MASK); - } - DBGRV(); - return 0; -} - -/* - * pcm_shutdown_port - shut down one port (direction) for PCM I/O. - * Only called from pcm_shutdown. - */ - -static void pcm_shutdown_port(vwsnd_dev_t *devc, - vwsnd_port_t *aport, - unsigned int mask) -{ - unsigned long flags; - vwsnd_port_hwstate_t hwstate; - DECLARE_WAITQUEUE(wait, current); - - aport->swstate = SW_INITIAL; - add_wait_queue(&aport->queue, &wait); - while (1) { - set_current_state(TASK_UNINTERRUPTIBLE); - spin_lock_irqsave(&aport->lock, flags); - { - hwstate = aport->hwstate; - } - spin_unlock_irqrestore(&aport->lock, flags); - if (hwstate == HW_STOPPED) - break; - schedule(); - } - current->state = TASK_RUNNING; - remove_wait_queue(&aport->queue, &wait); - li_disable_interrupts(&devc->lith, mask); - if (aport == &devc->rport) - ad1843_shutdown_adc(&devc->lith); - else /* aport == &devc->wport) */ - ad1843_shutdown_dac(&devc->lith); - li_shutdown_dma(&aport->chan); - vfree(aport->swbuf); - aport->swbuf = NULL; - aport->byte_count = 0; -} - -/* - * pcm_shutdown undoes what pcm_setup did. - * Also sets the ports' swstate to newstate. - */ - -static void pcm_shutdown(vwsnd_dev_t *devc, - vwsnd_port_t *rport, - vwsnd_port_t *wport) -{ - DBGEV("(devc=0x%p, rport=0x%p, wport=0x%p)\n", devc, rport, wport); - - if (rport && rport->swbuf) { - DBGPV("shutting down rport\n"); - pcm_shutdown_port(devc, rport, READ_INTR_MASK); - } - if (wport && wport->swbuf) { - DBGPV("shutting down wport\n"); - pcm_shutdown_port(devc, wport, WRITE_INTR_MASK); - } - DBGRV(); -} - -static void pcm_copy_in(vwsnd_port_t *rport, int swidx, int hwidx, int nb) -{ - char *src = rport->hwbuf + hwidx; - char *dst = rport->swbuf + swidx; - int fmt = rport->sw_samplefmt; - - DBGPV("swidx = %d, hwidx = %d\n", swidx, hwidx); - ASSERT(rport->hwbuf != NULL); - ASSERT(rport->swbuf != NULL); - ASSERT(nb > 0 && (nb % 32) == 0); - ASSERT(swidx % 32 == 0 && hwidx % 32 == 0); - ASSERT(swidx >= 0 && swidx + nb <= rport->swbuf_size); - ASSERT(hwidx >= 0 && hwidx + nb <= rport->hwbuf_size); - - if (fmt == AFMT_MU_LAW || fmt == AFMT_A_LAW || fmt == AFMT_S8) { - - /* See Sample Format Notes above. */ - - char *end = src + nb; - while (src < end) - *dst++ = *src++ ^ 0x80; - } else - memcpy(dst, src, nb); -} - -static void pcm_copy_out(vwsnd_port_t *wport, int swidx, int hwidx, int nb) -{ - char *src = wport->swbuf + swidx; - char *dst = wport->hwbuf + hwidx; - int fmt = wport->sw_samplefmt; - - ASSERT(nb > 0 && (nb % 32) == 0); - ASSERT(wport->hwbuf != NULL); - ASSERT(wport->swbuf != NULL); - ASSERT(swidx % 32 == 0 && hwidx % 32 == 0); - ASSERT(swidx >= 0 && swidx + nb <= wport->swbuf_size); - ASSERT(hwidx >= 0 && hwidx + nb <= wport->hwbuf_size); - if (fmt == AFMT_MU_LAW || fmt == AFMT_A_LAW || fmt == AFMT_S8) { - - /* See Sample Format Notes above. */ - - char *end = src + nb; - while (src < end) - *dst++ = *src++ ^ 0x80; - } else - memcpy(dst, src, nb); -} - -/* - * pcm_output() is called both from baselevel and from interrupt level. - * This is where audio frames are copied into the hardware-accessible - * ring buffer. - * - * Locking note: The part of this routine that figures out what to do - * holds wport->lock. The longer part releases wport->lock, but sets - * wport->flags & HW_BUSY. Afterward, it reacquires wport->lock, and - * checks for more work to do. - * - * If another thread calls pcm_output() while HW_BUSY is set, it - * returns immediately, knowing that the thread that set HW_BUSY will - * look for more work to do before returning. - * - * This has the advantage that port->lock is held for several short - * periods instead of one long period. Also, when pcm_output is - * called from base level, it reenables interrupts. - */ - -static void pcm_output(vwsnd_dev_t *devc, int erflown, int nb) -{ - vwsnd_port_t *wport = &devc->wport; - const int hwmax = wport->hwbuf_max; - const int hwsize = wport->hwbuf_size; - const int swsize = wport->swbuf_size; - const int fragsize = wport->hw_fragsize; - unsigned long iflags; - - DBGEV("(devc=0x%p, erflown=%d, nb=%d)\n", devc, erflown, nb); - spin_lock_irqsave(&wport->lock, iflags); - if (erflown) - wport->flags |= ERFLOWN; - (void) __swb_inc_u(wport, nb); - if (wport->flags & HW_BUSY) { - spin_unlock_irqrestore(&wport->lock, iflags); - DBGPV("returning: HW BUSY\n"); - return; - } - if (wport->flags & DISABLED) { - spin_unlock_irqrestore(&wport->lock, iflags); - DBGPV("returning: DISABLED\n"); - return; - } - wport->flags |= HW_BUSY; - while (1) { - int swptr, hwptr, hw_avail, sw_avail, swidx; - vwsnd_port_hwstate_t hwstate = wport->hwstate; - vwsnd_port_swstate_t swstate = wport->swstate; - int hw_unavail; - ustmsc_t ustmsc; - - hwptr = li_read_hwptr(&wport->chan); - swptr = li_read_swptr(&wport->chan); - hw_unavail = (swptr - hwptr + hwsize) % hwsize; - hw_avail = (hwmax - hw_unavail) & -fragsize; - sw_avail = wport->swb_i_avail & -fragsize; - if (sw_avail && swstate == SW_RUN) { - if (wport->flags & ERFLOWN) { - wport->flags &= ~ERFLOWN; - } - } else if (swstate == SW_INITIAL || - swstate == SW_OFF || - (swstate == SW_DRAIN && - !sw_avail && - (wport->flags & ERFLOWN))) { - DBGP("stopping. hwstate = %d\n", hwstate); - if (hwstate != HW_STOPPED) { - li_deactivate_dma(&wport->chan); - wport->hwstate = HW_STOPPED; - } - wake_up(&wport->queue); - break; - } - if (!sw_avail || !hw_avail) - break; - spin_unlock_irqrestore(&wport->lock, iflags); - - /* - * We gave up the port lock, but we have the HW_BUSY flag. - * Proceed without accessing any nonlocal state. - * Do not exit the loop -- must check for more work. - */ - - swidx = wport->swb_i_idx; - nb = hw_avail; - if (nb > sw_avail) - nb = sw_avail; - if (nb > hwsize - swptr) - nb = hwsize - swptr; /* don't overflow hwbuf */ - if (nb > swsize - swidx) - nb = swsize - swidx; /* don't overflow swbuf */ - ASSERT(nb > 0); - if (nb % fragsize) { - DBGP("nb = %d, fragsize = %d\n", nb, fragsize); - DBGP("hw_avail = %d\n", hw_avail); - DBGP("sw_avail = %d\n", sw_avail); - DBGP("hwsize = %d, swptr = %d\n", hwsize, swptr); - DBGP("swsize = %d, swidx = %d\n", swsize, swidx); - } - ASSERT(!(nb % fragsize)); - DBGPV("copying swb[%d..%d] to hwb[%d..%d]\n", - swidx, swidx + nb, swptr, swptr + nb); - pcm_copy_out(wport, swidx, swptr, nb); - li_write_swptr(&wport->chan, (swptr + nb) % hwsize); - spin_lock_irqsave(&wport->lock, iflags); - if (hwstate == HW_STOPPED) { - DBGPV("starting\n"); - li_activate_dma(&wport->chan); - wport->hwstate = HW_RUNNING; - li_read_USTMSC(&wport->chan, &ustmsc); - ASSERT(wport->byte_count % wport->frame_size == 0); - wport->MSC_offset = ustmsc.msc - wport->byte_count / wport->frame_size; - } - __swb_inc_i(wport, nb); - wport->byte_count += nb; - wport->frag_count += nb / fragsize; - ASSERT(nb % fragsize == 0); - wake_up(&wport->queue); - } - wport->flags &= ~HW_BUSY; - spin_unlock_irqrestore(&wport->lock, iflags); - DBGRV(); -} - -/* - * pcm_input() is called both from baselevel and from interrupt level. - * This is where audio frames are copied out of the hardware-accessible - * ring buffer. - * - * Locking note: The part of this routine that figures out what to do - * holds rport->lock. The longer part releases rport->lock, but sets - * rport->flags & HW_BUSY. Afterward, it reacquires rport->lock, and - * checks for more work to do. - * - * If another thread calls pcm_input() while HW_BUSY is set, it - * returns immediately, knowing that the thread that set HW_BUSY will - * look for more work to do before returning. - * - * This has the advantage that port->lock is held for several short - * periods instead of one long period. Also, when pcm_input is - * called from base level, it reenables interrupts. - */ - -static void pcm_input(vwsnd_dev_t *devc, int erflown, int nb) -{ - vwsnd_port_t *rport = &devc->rport; - const int hwmax = rport->hwbuf_max; - const int hwsize = rport->hwbuf_size; - const int swsize = rport->swbuf_size; - const int fragsize = rport->hw_fragsize; - unsigned long iflags; - - DBGEV("(devc=0x%p, erflown=%d, nb=%d)\n", devc, erflown, nb); - - spin_lock_irqsave(&rport->lock, iflags); - if (erflown) - rport->flags |= ERFLOWN; - (void) __swb_inc_u(rport, nb); - if (rport->flags & HW_BUSY || !rport->swbuf) { - spin_unlock_irqrestore(&rport->lock, iflags); - DBGPV("returning: HW BUSY or !swbuf\n"); - return; - } - if (rport->flags & DISABLED) { - spin_unlock_irqrestore(&rport->lock, iflags); - DBGPV("returning: DISABLED\n"); - return; - } - rport->flags |= HW_BUSY; - while (1) { - int swptr, hwptr, hw_avail, sw_avail, swidx; - vwsnd_port_hwstate_t hwstate = rport->hwstate; - vwsnd_port_swstate_t swstate = rport->swstate; - - hwptr = li_read_hwptr(&rport->chan); - swptr = li_read_swptr(&rport->chan); - hw_avail = (hwptr - swptr + hwsize) % hwsize & -fragsize; - if (hw_avail > hwmax) - hw_avail = hwmax; - sw_avail = rport->swb_i_avail & -fragsize; - if (swstate != SW_RUN) { - DBGP("stopping. hwstate = %d\n", hwstate); - if (hwstate != HW_STOPPED) { - li_deactivate_dma(&rport->chan); - rport->hwstate = HW_STOPPED; - } - wake_up(&rport->queue); - break; - } - if (!sw_avail || !hw_avail) - break; - spin_unlock_irqrestore(&rport->lock, iflags); - - /* - * We gave up the port lock, but we have the HW_BUSY flag. - * Proceed without accessing any nonlocal state. - * Do not exit the loop -- must check for more work. - */ - - swidx = rport->swb_i_idx; - nb = hw_avail; - if (nb > sw_avail) - nb = sw_avail; - if (nb > hwsize - swptr) - nb = hwsize - swptr; /* don't overflow hwbuf */ - if (nb > swsize - swidx) - nb = swsize - swidx; /* don't overflow swbuf */ - ASSERT(nb > 0); - if (nb % fragsize) { - DBGP("nb = %d, fragsize = %d\n", nb, fragsize); - DBGP("hw_avail = %d\n", hw_avail); - DBGP("sw_avail = %d\n", sw_avail); - DBGP("hwsize = %d, swptr = %d\n", hwsize, swptr); - DBGP("swsize = %d, swidx = %d\n", swsize, swidx); - } - ASSERT(!(nb % fragsize)); - DBGPV("copying hwb[%d..%d] to swb[%d..%d]\n", - swptr, swptr + nb, swidx, swidx + nb); - pcm_copy_in(rport, swidx, swptr, nb); - li_write_swptr(&rport->chan, (swptr + nb) % hwsize); - spin_lock_irqsave(&rport->lock, iflags); - __swb_inc_i(rport, nb); - rport->byte_count += nb; - rport->frag_count += nb / fragsize; - ASSERT(nb % fragsize == 0); - wake_up(&rport->queue); - } - rport->flags &= ~HW_BUSY; - spin_unlock_irqrestore(&rport->lock, iflags); - DBGRV(); -} - -/* - * pcm_flush_frag() writes zero samples to fill the current fragment, - * then flushes it to the hardware. - * - * It is only meaningful to flush output, not input. - */ - -static void pcm_flush_frag(vwsnd_dev_t *devc) -{ - vwsnd_port_t *wport = &devc->wport; - - DBGPV("swstate = %d\n", wport->swstate); - if (wport->swstate == SW_RUN) { - int idx = wport->swb_u_idx; - int end = (idx + wport->hw_fragsize - 1) - >> wport->hw_fragshift - << wport->hw_fragshift; - int nb = end - idx; - DBGPV("clearing %d bytes\n", nb); - if (nb) - memset(wport->swbuf + idx, - (char) wport->zero_word, - nb); - wport->swstate = SW_DRAIN; - pcm_output(devc, 0, nb); - } - DBGRV(); -} - -/* - * Wait for output to drain. This sleeps uninterruptibly because - * there is nothing intelligent we can do if interrupted. This - * means the process will be delayed in responding to the signal. - */ - -static void pcm_write_sync(vwsnd_dev_t *devc) -{ - vwsnd_port_t *wport = &devc->wport; - DECLARE_WAITQUEUE(wait, current); - unsigned long flags; - vwsnd_port_hwstate_t hwstate; - - DBGEV("(devc=0x%p)\n", devc); - add_wait_queue(&wport->queue, &wait); - while (1) { - set_current_state(TASK_UNINTERRUPTIBLE); - spin_lock_irqsave(&wport->lock, flags); - { - hwstate = wport->hwstate; - } - spin_unlock_irqrestore(&wport->lock, flags); - if (hwstate == HW_STOPPED) - break; - schedule(); - } - current->state = TASK_RUNNING; - remove_wait_queue(&wport->queue, &wait); - DBGPV("swstate = %d, hwstate = %d\n", wport->swstate, wport->hwstate); - DBGRV(); -} - -/*****************************************************************************/ -/* audio driver */ - -/* - * seek on an audio device always fails. - */ - -static void vwsnd_audio_read_intr(vwsnd_dev_t *devc, unsigned int status) -{ - int overflown = status & LI_INTR_COMM1_OVERFLOW; - - if (status & READ_INTR_MASK) - pcm_input(devc, overflown, 0); -} - -static void vwsnd_audio_write_intr(vwsnd_dev_t *devc, unsigned int status) -{ - int underflown = status & LI_INTR_COMM2_UNDERFLOW; - - if (status & WRITE_INTR_MASK) - pcm_output(devc, underflown, 0); -} - -static irqreturn_t vwsnd_audio_intr(int irq, void *dev_id) -{ - vwsnd_dev_t *devc = dev_id; - unsigned int status; - - DBGEV("(irq=%d, dev_id=0x%p)\n", irq, dev_id); - - status = li_get_clear_intr_status(&devc->lith); - vwsnd_audio_read_intr(devc, status); - vwsnd_audio_write_intr(devc, status); - return IRQ_HANDLED; -} - -static ssize_t vwsnd_audio_do_read(struct file *file, - char *buffer, - size_t count, - loff_t *ppos) -{ - vwsnd_dev_t *devc = file->private_data; - vwsnd_port_t *rport = ((file->f_mode & FMODE_READ) ? - &devc->rport : NULL); - int ret, nb; - - DBGEV("(file=0x%p, buffer=0x%p, count=%d, ppos=0x%p)\n", - file, buffer, count, ppos); - - if (!rport) - return -EINVAL; - - if (rport->swbuf == NULL) { - vwsnd_port_t *wport = (file->f_mode & FMODE_WRITE) ? - &devc->wport : NULL; - ret = pcm_setup(devc, rport, wport); - if (ret < 0) - return ret; - } - - if (!access_ok(VERIFY_READ, buffer, count)) - return -EFAULT; - ret = 0; - while (count) { - DECLARE_WAITQUEUE(wait, current); - add_wait_queue(&rport->queue, &wait); - while ((nb = swb_inc_u(rport, 0)) == 0) { - DBGPV("blocking\n"); - set_current_state(TASK_INTERRUPTIBLE); - if (rport->flags & DISABLED || - file->f_flags & O_NONBLOCK) { - current->state = TASK_RUNNING; - remove_wait_queue(&rport->queue, &wait); - return ret ? ret : -EAGAIN; - } - schedule(); - if (signal_pending(current)) { - current->state = TASK_RUNNING; - remove_wait_queue(&rport->queue, &wait); - return ret ? ret : -ERESTARTSYS; - } - } - current->state = TASK_RUNNING; - remove_wait_queue(&rport->queue, &wait); - pcm_input(devc, 0, 0); - /* nb bytes are available in userbuf. */ - if (nb > count) - nb = count; - DBGPV("nb = %d\n", nb); - if (copy_to_user(buffer, rport->swbuf + rport->swb_u_idx, nb)) - return -EFAULT; - (void) swb_inc_u(rport, nb); - buffer += nb; - count -= nb; - ret += nb; - } - DBGPV("returning %d\n", ret); - return ret; -} - -static ssize_t vwsnd_audio_read(struct file *file, - char *buffer, - size_t count, - loff_t *ppos) -{ - vwsnd_dev_t *devc = file->private_data; - ssize_t ret; - - mutex_lock(&devc->io_mutex); - ret = vwsnd_audio_do_read(file, buffer, count, ppos); - mutex_unlock(&devc->io_mutex); - return ret; -} - -static ssize_t vwsnd_audio_do_write(struct file *file, - const char *buffer, - size_t count, - loff_t *ppos) -{ - vwsnd_dev_t *devc = file->private_data; - vwsnd_port_t *wport = ((file->f_mode & FMODE_WRITE) ? - &devc->wport : NULL); - int ret, nb; - - DBGEV("(file=0x%p, buffer=0x%p, count=%d, ppos=0x%p)\n", - file, buffer, count, ppos); - - if (!wport) - return -EINVAL; - - if (wport->swbuf == NULL) { - vwsnd_port_t *rport = (file->f_mode & FMODE_READ) ? - &devc->rport : NULL; - ret = pcm_setup(devc, rport, wport); - if (ret < 0) - return ret; - } - if (!access_ok(VERIFY_WRITE, buffer, count)) - return -EFAULT; - ret = 0; - while (count) { - DECLARE_WAITQUEUE(wait, current); - add_wait_queue(&wport->queue, &wait); - while ((nb = swb_inc_u(wport, 0)) == 0) { - set_current_state(TASK_INTERRUPTIBLE); - if (wport->flags & DISABLED || - file->f_flags & O_NONBLOCK) { - current->state = TASK_RUNNING; - remove_wait_queue(&wport->queue, &wait); - return ret ? ret : -EAGAIN; - } - schedule(); - if (signal_pending(current)) { - current->state = TASK_RUNNING; - remove_wait_queue(&wport->queue, &wait); - return ret ? ret : -ERESTARTSYS; - } - } - current->state = TASK_RUNNING; - remove_wait_queue(&wport->queue, &wait); - /* nb bytes are available in userbuf. */ - if (nb > count) - nb = count; - DBGPV("nb = %d\n", nb); - if (copy_from_user(wport->swbuf + wport->swb_u_idx, buffer, nb)) - return -EFAULT; - pcm_output(devc, 0, nb); - buffer += nb; - count -= nb; - ret += nb; - } - DBGPV("returning %d\n", ret); - return ret; -} - -static ssize_t vwsnd_audio_write(struct file *file, - const char *buffer, - size_t count, - loff_t *ppos) -{ - vwsnd_dev_t *devc = file->private_data; - ssize_t ret; - - mutex_lock(&devc->io_mutex); - ret = vwsnd_audio_do_write(file, buffer, count, ppos); - mutex_unlock(&devc->io_mutex); - return ret; -} - -/* No kernel lock - fine */ -static unsigned int vwsnd_audio_poll(struct file *file, - struct poll_table_struct *wait) -{ - vwsnd_dev_t *devc = (vwsnd_dev_t *) file->private_data; - vwsnd_port_t *rport = (file->f_mode & FMODE_READ) ? - &devc->rport : NULL; - vwsnd_port_t *wport = (file->f_mode & FMODE_WRITE) ? - &devc->wport : NULL; - unsigned int mask = 0; - - DBGEV("(file=0x%p, wait=0x%p)\n", file, wait); - - ASSERT(rport || wport); - if (rport) { - poll_wait(file, &rport->queue, wait); - if (swb_inc_u(rport, 0)) - mask |= (POLLIN | POLLRDNORM); - } - if (wport) { - poll_wait(file, &wport->queue, wait); - if (wport->swbuf == NULL || swb_inc_u(wport, 0)) - mask |= (POLLOUT | POLLWRNORM); - } - - DBGPV("returning 0x%x\n", mask); - return mask; -} - -static int vwsnd_audio_do_ioctl(struct file *file, - unsigned int cmd, - unsigned long arg) -{ - vwsnd_dev_t *devc = (vwsnd_dev_t *) file->private_data; - vwsnd_port_t *rport = (file->f_mode & FMODE_READ) ? - &devc->rport : NULL; - vwsnd_port_t *wport = (file->f_mode & FMODE_WRITE) ? - &devc->wport : NULL; - vwsnd_port_t *aport = rport ? rport : wport; - struct audio_buf_info buf_info; - struct count_info info; - unsigned long flags; - int ival; - - - DBGEV("(file=0x%p, cmd=0x%x, arg=0x%lx)\n", - file, cmd, arg); - switch (cmd) { - case OSS_GETVERSION: /* _SIOR ('M', 118, int) */ - DBGX("OSS_GETVERSION\n"); - ival = SOUND_VERSION; - return put_user(ival, (int *) arg); - - case SNDCTL_DSP_GETCAPS: /* _SIOR ('P',15, int) */ - DBGX("SNDCTL_DSP_GETCAPS\n"); - ival = DSP_CAP_DUPLEX | DSP_CAP_REALTIME | DSP_CAP_TRIGGER; - return put_user(ival, (int *) arg); - - case SNDCTL_DSP_GETFMTS: /* _SIOR ('P',11, int) */ - DBGX("SNDCTL_DSP_GETFMTS\n"); - ival = (AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW | - AFMT_U8 | AFMT_S8); - return put_user(ival, (int *) arg); - break; - - case SOUND_PCM_READ_RATE: /* _SIOR ('P', 2, int) */ - DBGX("SOUND_PCM_READ_RATE\n"); - ival = aport->sw_framerate; - return put_user(ival, (int *) arg); - - case SOUND_PCM_READ_CHANNELS: /* _SIOR ('P', 6, int) */ - DBGX("SOUND_PCM_READ_CHANNELS\n"); - ival = aport->sw_channels; - return put_user(ival, (int *) arg); - - case SNDCTL_DSP_SPEED: /* _SIOWR('P', 2, int) */ - if (get_user(ival, (int *) arg)) - return -EFAULT; - DBGX("SNDCTL_DSP_SPEED %d\n", ival); - if (ival) { - if (aport->swstate != SW_INITIAL) { - DBGX("SNDCTL_DSP_SPEED failed: swstate = %d\n", - aport->swstate); - return -EINVAL; - } - if (ival < MIN_SPEED) - ival = MIN_SPEED; - if (ival > MAX_SPEED) - ival = MAX_SPEED; - if (rport) - rport->sw_framerate = ival; - if (wport) - wport->sw_framerate = ival; - } else - ival = aport->sw_framerate; - return put_user(ival, (int *) arg); - - case SNDCTL_DSP_STEREO: /* _SIOWR('P', 3, int) */ - if (get_user(ival, (int *) arg)) - return -EFAULT; - DBGX("SNDCTL_DSP_STEREO %d\n", ival); - if (ival != 0 && ival != 1) - return -EINVAL; - if (aport->swstate != SW_INITIAL) - return -EINVAL; - if (rport) - rport->sw_channels = ival + 1; - if (wport) - wport->sw_channels = ival + 1; - return put_user(ival, (int *) arg); - - case SNDCTL_DSP_CHANNELS: /* _SIOWR('P', 6, int) */ - if (get_user(ival, (int *) arg)) - return -EFAULT; - DBGX("SNDCTL_DSP_CHANNELS %d\n", ival); - if (ival != 1 && ival != 2) - return -EINVAL; - if (aport->swstate != SW_INITIAL) - return -EINVAL; - if (rport) - rport->sw_channels = ival; - if (wport) - wport->sw_channels = ival; - return put_user(ival, (int *) arg); - - case SNDCTL_DSP_GETBLKSIZE: /* _SIOWR('P', 4, int) */ - ival = pcm_setup(devc, rport, wport); - if (ival < 0) { - DBGX("SNDCTL_DSP_GETBLKSIZE failed, errno %d\n", ival); - return ival; - } - ival = 1 << aport->sw_fragshift; - DBGX("SNDCTL_DSP_GETBLKSIZE returning %d\n", ival); - return put_user(ival, (int *) arg); - - case SNDCTL_DSP_SETFRAGMENT: /* _SIOWR('P',10, int) */ - if (get_user(ival, (int *) arg)) - return -EFAULT; - DBGX("SNDCTL_DSP_SETFRAGMENT %d:%d\n", - ival >> 16, ival & 0xFFFF); - if (aport->swstate != SW_INITIAL) - return -EINVAL; - { - int sw_fragshift = ival & 0xFFFF; - int sw_subdivshift = aport->sw_subdivshift; - int hw_fragshift = sw_fragshift - sw_subdivshift; - int sw_fragcount = (ival >> 16) & 0xFFFF; - int hw_fragsize; - if (hw_fragshift < MIN_FRAGSHIFT) - hw_fragshift = MIN_FRAGSHIFT; - if (hw_fragshift > MAX_FRAGSHIFT) - hw_fragshift = MAX_FRAGSHIFT; - sw_fragshift = hw_fragshift + aport->sw_subdivshift; - hw_fragsize = 1 << hw_fragshift; - if (sw_fragcount < MIN_FRAGCOUNT(hw_fragsize)) - sw_fragcount = MIN_FRAGCOUNT(hw_fragsize); - if (sw_fragcount > MAX_FRAGCOUNT(hw_fragsize)) - sw_fragcount = MAX_FRAGCOUNT(hw_fragsize); - DBGPV("sw_fragshift = %d\n", sw_fragshift); - DBGPV("rport = 0x%p, wport = 0x%p\n", rport, wport); - if (rport) { - rport->sw_fragshift = sw_fragshift; - rport->sw_fragcount = sw_fragcount; - } - if (wport) { - wport->sw_fragshift = sw_fragshift; - wport->sw_fragcount = sw_fragcount; - } - ival = sw_fragcount << 16 | sw_fragshift; - } - DBGX("SNDCTL_DSP_SETFRAGMENT returns %d:%d\n", - ival >> 16, ival & 0xFFFF); - return put_user(ival, (int *) arg); - - case SNDCTL_DSP_SUBDIVIDE: /* _SIOWR('P', 9, int) */ - if (get_user(ival, (int *) arg)) - return -EFAULT; - DBGX("SNDCTL_DSP_SUBDIVIDE %d\n", ival); - if (aport->swstate != SW_INITIAL) - return -EINVAL; - { - int subdivshift; - int hw_fragshift, hw_fragsize, hw_fragcount; - switch (ival) { - case 1: subdivshift = 0; break; - case 2: subdivshift = 1; break; - case 4: subdivshift = 2; break; - default: return -EINVAL; - } - hw_fragshift = aport->sw_fragshift - subdivshift; - if (hw_fragshift < MIN_FRAGSHIFT || - hw_fragshift > MAX_FRAGSHIFT) - return -EINVAL; - hw_fragsize = 1 << hw_fragshift; - hw_fragcount = aport->sw_fragcount >> subdivshift; - if (hw_fragcount < MIN_FRAGCOUNT(hw_fragsize) || - hw_fragcount > MAX_FRAGCOUNT(hw_fragsize)) - return -EINVAL; - if (rport) - rport->sw_subdivshift = subdivshift; - if (wport) - wport->sw_subdivshift = subdivshift; - } - return 0; - - case SNDCTL_DSP_SETFMT: /* _SIOWR('P',5, int) */ - if (get_user(ival, (int *) arg)) - return -EFAULT; - DBGX("SNDCTL_DSP_SETFMT %d\n", ival); - if (ival != AFMT_QUERY) { - if (aport->swstate != SW_INITIAL) { - DBGP("SETFMT failed, swstate = %d\n", - aport->swstate); - return -EINVAL; - } - switch (ival) { - case AFMT_MU_LAW: - case AFMT_A_LAW: - case AFMT_U8: - case AFMT_S8: - case AFMT_S16_LE: - if (rport) - rport->sw_samplefmt = ival; - if (wport) - wport->sw_samplefmt = ival; - break; - default: - return -EINVAL; - } - } - ival = aport->sw_samplefmt; - return put_user(ival, (int *) arg); - - case SNDCTL_DSP_GETOSPACE: /* _SIOR ('P',12, audio_buf_info) */ - DBGXV("SNDCTL_DSP_GETOSPACE\n"); - if (!wport) - return -EINVAL; - ival = pcm_setup(devc, rport, wport); - if (ival < 0) - return ival; - ival = swb_inc_u(wport, 0); - buf_info.fragments = ival >> wport->sw_fragshift; - buf_info.fragstotal = wport->sw_fragcount; - buf_info.fragsize = 1 << wport->sw_fragshift; - buf_info.bytes = ival; - DBGXV("SNDCTL_DSP_GETOSPACE returns { %d %d %d %d }\n", - buf_info.fragments, buf_info.fragstotal, - buf_info.fragsize, buf_info.bytes); - if (copy_to_user((void *) arg, &buf_info, sizeof buf_info)) - return -EFAULT; - return 0; - - case SNDCTL_DSP_GETISPACE: /* _SIOR ('P',13, audio_buf_info) */ - DBGX("SNDCTL_DSP_GETISPACE\n"); - if (!rport) - return -EINVAL; - ival = pcm_setup(devc, rport, wport); - if (ival < 0) - return ival; - ival = swb_inc_u(rport, 0); - buf_info.fragments = ival >> rport->sw_fragshift; - buf_info.fragstotal = rport->sw_fragcount; - buf_info.fragsize = 1 << rport->sw_fragshift; - buf_info.bytes = ival; - DBGX("SNDCTL_DSP_GETISPACE returns { %d %d %d %d }\n", - buf_info.fragments, buf_info.fragstotal, - buf_info.fragsize, buf_info.bytes); - if (copy_to_user((void *) arg, &buf_info, sizeof buf_info)) - return -EFAULT; - return 0; - - case SNDCTL_DSP_NONBLOCK: /* _SIO ('P',14) */ - DBGX("SNDCTL_DSP_NONBLOCK\n"); - spin_lock(&file->f_lock); - file->f_flags |= O_NONBLOCK; - spin_unlock(&file->f_lock); - return 0; - - case SNDCTL_DSP_RESET: /* _SIO ('P', 0) */ - DBGX("SNDCTL_DSP_RESET\n"); - /* - * Nothing special needs to be done for input. Input - * samples sit in swbuf, but it will be reinitialized - * to empty when pcm_setup() is called. - */ - if (wport && wport->swbuf) { - wport->swstate = SW_INITIAL; - pcm_output(devc, 0, 0); - pcm_write_sync(devc); - } - pcm_shutdown(devc, rport, wport); - return 0; - - case SNDCTL_DSP_SYNC: /* _SIO ('P', 1) */ - DBGX("SNDCTL_DSP_SYNC\n"); - if (wport) { - pcm_flush_frag(devc); - pcm_write_sync(devc); - } - pcm_shutdown(devc, rport, wport); - return 0; - - case SNDCTL_DSP_POST: /* _SIO ('P', 8) */ - DBGX("SNDCTL_DSP_POST\n"); - if (!wport) - return -EINVAL; - pcm_flush_frag(devc); - return 0; - - case SNDCTL_DSP_GETIPTR: /* _SIOR ('P', 17, count_info) */ - DBGX("SNDCTL_DSP_GETIPTR\n"); - if (!rport) - return -EINVAL; - spin_lock_irqsave(&rport->lock, flags); - { - ustmsc_t ustmsc; - if (rport->hwstate == HW_RUNNING) { - ASSERT(rport->swstate == SW_RUN); - li_read_USTMSC(&rport->chan, &ustmsc); - info.bytes = ustmsc.msc - rport->MSC_offset; - info.bytes *= rport->frame_size; - } else { - info.bytes = rport->byte_count; - } - info.blocks = rport->frag_count; - info.ptr = 0; /* not implemented */ - rport->frag_count = 0; - } - spin_unlock_irqrestore(&rport->lock, flags); - if (copy_to_user((void *) arg, &info, sizeof info)) - return -EFAULT; - return 0; - - case SNDCTL_DSP_GETOPTR: /* _SIOR ('P',18, count_info) */ - DBGX("SNDCTL_DSP_GETOPTR\n"); - if (!wport) - return -EINVAL; - spin_lock_irqsave(&wport->lock, flags); - { - ustmsc_t ustmsc; - if (wport->hwstate == HW_RUNNING) { - ASSERT(wport->swstate == SW_RUN); - li_read_USTMSC(&wport->chan, &ustmsc); - info.bytes = ustmsc.msc - wport->MSC_offset; - info.bytes *= wport->frame_size; - } else { - info.bytes = wport->byte_count; - } - info.blocks = wport->frag_count; - info.ptr = 0; /* not implemented */ - wport->frag_count = 0; - } - spin_unlock_irqrestore(&wport->lock, flags); - if (copy_to_user((void *) arg, &info, sizeof info)) - return -EFAULT; - return 0; - - case SNDCTL_DSP_GETODELAY: /* _SIOR ('P', 23, int) */ - DBGX("SNDCTL_DSP_GETODELAY\n"); - if (!wport) - return -EINVAL; - spin_lock_irqsave(&wport->lock, flags); - { - int fsize = wport->frame_size; - ival = wport->swb_i_avail / fsize; - if (wport->hwstate == HW_RUNNING) { - int swptr, hwptr, hwframes, hwbytes, hwsize; - int totalhwbytes; - ustmsc_t ustmsc; - - hwsize = wport->hwbuf_size; - swptr = li_read_swptr(&wport->chan); - li_read_USTMSC(&wport->chan, &ustmsc); - hwframes = ustmsc.msc - wport->MSC_offset; - totalhwbytes = hwframes * fsize; - hwptr = totalhwbytes % hwsize; - hwbytes = (swptr - hwptr + hwsize) % hwsize; - ival += hwbytes / fsize; - } - } - spin_unlock_irqrestore(&wport->lock, flags); - return put_user(ival, (int *) arg); - - case SNDCTL_DSP_PROFILE: /* _SIOW ('P', 23, int) */ - DBGX("SNDCTL_DSP_PROFILE\n"); - - /* - * Thomas Sailer explains SNDCTL_DSP_PROFILE - * (private email, March 24, 1999): - * - * This gives the sound driver a hint on what it - * should do with partial fragments - * (i.e. fragments partially filled with write). - * This can direct the driver to zero them or - * leave them alone. But don't ask me what this - * is good for, my driver just zeroes the last - * fragment before the receiver stops, no idea - * what good for any other behaviour could - * be. Implementing it as NOP seems safe. - */ - - break; - - case SNDCTL_DSP_GETTRIGGER: /* _SIOR ('P',16, int) */ - DBGX("SNDCTL_DSP_GETTRIGGER\n"); - ival = 0; - if (rport) { - spin_lock_irqsave(&rport->lock, flags); - { - if (!(rport->flags & DISABLED)) - ival |= PCM_ENABLE_INPUT; - } - spin_unlock_irqrestore(&rport->lock, flags); - } - if (wport) { - spin_lock_irqsave(&wport->lock, flags); - { - if (!(wport->flags & DISABLED)) - ival |= PCM_ENABLE_OUTPUT; - } - spin_unlock_irqrestore(&wport->lock, flags); - } - return put_user(ival, (int *) arg); - - case SNDCTL_DSP_SETTRIGGER: /* _SIOW ('P',16, int) */ - if (get_user(ival, (int *) arg)) - return -EFAULT; - DBGX("SNDCTL_DSP_SETTRIGGER %d\n", ival); - - /* - * If user is disabling I/O and port is not in initial - * state, fail with EINVAL. - */ - - if (((rport && !(ival & PCM_ENABLE_INPUT)) || - (wport && !(ival & PCM_ENABLE_OUTPUT))) && - aport->swstate != SW_INITIAL) - return -EINVAL; - - if (rport) { - vwsnd_port_hwstate_t hwstate; - spin_lock_irqsave(&rport->lock, flags); - { - hwstate = rport->hwstate; - if (ival & PCM_ENABLE_INPUT) - rport->flags &= ~DISABLED; - else - rport->flags |= DISABLED; - } - spin_unlock_irqrestore(&rport->lock, flags); - if (hwstate != HW_RUNNING && ival & PCM_ENABLE_INPUT) { - - if (rport->swstate == SW_INITIAL) - pcm_setup(devc, rport, wport); - else - li_activate_dma(&rport->chan); - } - } - if (wport) { - vwsnd_port_flags_t pflags; - spin_lock_irqsave(&wport->lock, flags); - { - pflags = wport->flags; - if (ival & PCM_ENABLE_OUTPUT) - wport->flags &= ~DISABLED; - else - wport->flags |= DISABLED; - } - spin_unlock_irqrestore(&wport->lock, flags); - if (pflags & DISABLED && ival & PCM_ENABLE_OUTPUT) { - if (wport->swstate == SW_RUN) - pcm_output(devc, 0, 0); - } - } - return 0; - - default: - DBGP("unknown ioctl 0x%x\n", cmd); - return -EINVAL; - } - DBGP("unimplemented ioctl 0x%x\n", cmd); - return -EINVAL; -} - -static long vwsnd_audio_ioctl(struct file *file, - unsigned int cmd, - unsigned long arg) -{ - vwsnd_dev_t *devc = (vwsnd_dev_t *) file->private_data; - int ret; - - mutex_lock(&vwsnd_mutex); - mutex_lock(&devc->io_mutex); - ret = vwsnd_audio_do_ioctl(file, cmd, arg); - mutex_unlock(&devc->io_mutex); - mutex_unlock(&vwsnd_mutex); - - return ret; -} - -/* No mmap. */ - -static int vwsnd_audio_mmap(struct file *file, struct vm_area_struct *vma) -{ - DBGE("(file=0x%p, vma=0x%p)\n", file, vma); - return -ENODEV; -} - -/* - * Open the audio device for read and/or write. - * - * Returns 0 on success, -errno on failure. - */ - -static int vwsnd_audio_open(struct inode *inode, struct file *file) -{ - vwsnd_dev_t *devc; - int minor = iminor(inode); - int sw_samplefmt; - DEFINE_WAIT(wait); - - DBGE("(inode=0x%p, file=0x%p)\n", inode, file); - - mutex_lock(&vwsnd_mutex); - INC_USE_COUNT; - for (devc = vwsnd_dev_list; devc; devc = devc->next_dev) - if ((devc->audio_minor & ~0x0F) == (minor & ~0x0F)) - break; - - if (devc == NULL) { - DEC_USE_COUNT; - mutex_unlock(&vwsnd_mutex); - return -ENODEV; - } - - mutex_lock(&devc->open_mutex); - while (1) { - prepare_to_wait(&devc->open_wait, &wait, TASK_INTERRUPTIBLE); - if (!(devc->open_mode & file->f_mode)) - break; - - mutex_unlock(&devc->open_mutex); - mutex_unlock(&vwsnd_mutex); - if (file->f_flags & O_NONBLOCK) { - DEC_USE_COUNT; - return -EBUSY; - } - schedule(); - if (signal_pending(current)) { - DEC_USE_COUNT; - return -ERESTARTSYS; - } - mutex_lock(&vwsnd_mutex); - mutex_lock(&devc->open_mutex); - } - finish_wait(&devc->open_wait, &wait); - devc->open_mode |= file->f_mode & (FMODE_READ | FMODE_WRITE); - mutex_unlock(&devc->open_mutex); - - /* get default sample format from minor number. */ - - sw_samplefmt = 0; - if ((minor & 0xF) == SND_DEV_DSP) - sw_samplefmt = AFMT_U8; - else if ((minor & 0xF) == SND_DEV_AUDIO) - sw_samplefmt = AFMT_MU_LAW; - else if ((minor & 0xF) == SND_DEV_DSP16) - sw_samplefmt = AFMT_S16_LE; - else - ASSERT(0); - - /* Initialize vwsnd_ports. */ - - mutex_lock(&devc->io_mutex); - { - if (file->f_mode & FMODE_READ) { - devc->rport.swstate = SW_INITIAL; - devc->rport.flags = 0; - devc->rport.sw_channels = 1; - devc->rport.sw_samplefmt = sw_samplefmt; - devc->rport.sw_framerate = 8000; - devc->rport.sw_fragshift = DEFAULT_FRAGSHIFT; - devc->rport.sw_fragcount = DEFAULT_FRAGCOUNT; - devc->rport.sw_subdivshift = DEFAULT_SUBDIVSHIFT; - devc->rport.byte_count = 0; - devc->rport.frag_count = 0; - } - if (file->f_mode & FMODE_WRITE) { - devc->wport.swstate = SW_INITIAL; - devc->wport.flags = 0; - devc->wport.sw_channels = 1; - devc->wport.sw_samplefmt = sw_samplefmt; - devc->wport.sw_framerate = 8000; - devc->wport.sw_fragshift = DEFAULT_FRAGSHIFT; - devc->wport.sw_fragcount = DEFAULT_FRAGCOUNT; - devc->wport.sw_subdivshift = DEFAULT_SUBDIVSHIFT; - devc->wport.byte_count = 0; - devc->wport.frag_count = 0; - } - } - mutex_unlock(&devc->io_mutex); - - file->private_data = devc; - DBGRV(); - mutex_unlock(&vwsnd_mutex); - return 0; -} - -/* - * Release (close) the audio device. - */ - -static int vwsnd_audio_release(struct inode *inode, struct file *file) -{ - vwsnd_dev_t *devc = (vwsnd_dev_t *) file->private_data; - vwsnd_port_t *wport = NULL, *rport = NULL; - int err = 0; - - mutex_lock(&vwsnd_mutex); - mutex_lock(&devc->io_mutex); - { - DBGEV("(inode=0x%p, file=0x%p)\n", inode, file); - - if (file->f_mode & FMODE_READ) - rport = &devc->rport; - if (file->f_mode & FMODE_WRITE) { - wport = &devc->wport; - pcm_flush_frag(devc); - pcm_write_sync(devc); - } - pcm_shutdown(devc, rport, wport); - if (rport) - rport->swstate = SW_OFF; - if (wport) - wport->swstate = SW_OFF; - } - mutex_unlock(&devc->io_mutex); - - mutex_lock(&devc->open_mutex); - { - devc->open_mode &= ~file->f_mode; - } - mutex_unlock(&devc->open_mutex); - wake_up(&devc->open_wait); - DEC_USE_COUNT; - DBGR(); - mutex_unlock(&vwsnd_mutex); - return err; -} - -static const struct file_operations vwsnd_audio_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .read = vwsnd_audio_read, - .write = vwsnd_audio_write, - .poll = vwsnd_audio_poll, - .unlocked_ioctl = vwsnd_audio_ioctl, - .mmap = vwsnd_audio_mmap, - .open = vwsnd_audio_open, - .release = vwsnd_audio_release, -}; - -/*****************************************************************************/ -/* mixer driver */ - -/* open the mixer device. */ - -static int vwsnd_mixer_open(struct inode *inode, struct file *file) -{ - vwsnd_dev_t *devc; - - DBGEV("(inode=0x%p, file=0x%p)\n", inode, file); - - INC_USE_COUNT; - mutex_lock(&vwsnd_mutex); - for (devc = vwsnd_dev_list; devc; devc = devc->next_dev) - if (devc->mixer_minor == iminor(inode)) - break; - - if (devc == NULL) { - DEC_USE_COUNT; - mutex_unlock(&vwsnd_mutex); - return -ENODEV; - } - file->private_data = devc; - mutex_unlock(&vwsnd_mutex); - return 0; -} - -/* release (close) the mixer device. */ - -static int vwsnd_mixer_release(struct inode *inode, struct file *file) -{ - DBGEV("(inode=0x%p, file=0x%p)\n", inode, file); - DEC_USE_COUNT; - return 0; -} - -/* mixer_read_ioctl handles all read ioctls on the mixer device. */ - -static int mixer_read_ioctl(vwsnd_dev_t *devc, unsigned int nr, void __user *arg) -{ - int val = -1; - - DBGEV("(devc=0x%p, nr=0x%x, arg=0x%p)\n", devc, nr, arg); - - switch (nr) { - case SOUND_MIXER_CAPS: - val = SOUND_CAP_EXCL_INPUT; - break; - - case SOUND_MIXER_DEVMASK: - val = (SOUND_MASK_PCM | SOUND_MASK_LINE | - SOUND_MASK_MIC | SOUND_MASK_CD | SOUND_MASK_RECLEV); - break; - - case SOUND_MIXER_STEREODEVS: - val = (SOUND_MASK_PCM | SOUND_MASK_LINE | - SOUND_MASK_MIC | SOUND_MASK_CD | SOUND_MASK_RECLEV); - break; - - case SOUND_MIXER_OUTMASK: - val = (SOUND_MASK_PCM | SOUND_MASK_LINE | - SOUND_MASK_MIC | SOUND_MASK_CD); - break; - - case SOUND_MIXER_RECMASK: - val = (SOUND_MASK_PCM | SOUND_MASK_LINE | - SOUND_MASK_MIC | SOUND_MASK_CD); - break; - - case SOUND_MIXER_PCM: - val = ad1843_get_gain(&devc->lith, &ad1843_gain_PCM); - break; - - case SOUND_MIXER_LINE: - val = ad1843_get_gain(&devc->lith, &ad1843_gain_LINE); - break; - - case SOUND_MIXER_MIC: - val = ad1843_get_gain(&devc->lith, &ad1843_gain_MIC); - break; - - case SOUND_MIXER_CD: - val = ad1843_get_gain(&devc->lith, &ad1843_gain_CD); - break; - - case SOUND_MIXER_RECLEV: - val = ad1843_get_gain(&devc->lith, &ad1843_gain_RECLEV); - break; - - case SOUND_MIXER_RECSRC: - val = ad1843_get_recsrc(&devc->lith); - break; - - case SOUND_MIXER_OUTSRC: - val = ad1843_get_outsrc(&devc->lith); - break; - - default: - return -EINVAL; - } - return put_user(val, (int __user *) arg); -} - -/* mixer_write_ioctl handles all write ioctls on the mixer device. */ - -static int mixer_write_ioctl(vwsnd_dev_t *devc, unsigned int nr, void __user *arg) -{ - int val; - int err; - - DBGEV("(devc=0x%p, nr=0x%x, arg=0x%p)\n", devc, nr, arg); - - err = get_user(val, (int __user *) arg); - if (err) - return -EFAULT; - switch (nr) { - case SOUND_MIXER_PCM: - val = ad1843_set_gain(&devc->lith, &ad1843_gain_PCM, val); - break; - - case SOUND_MIXER_LINE: - val = ad1843_set_gain(&devc->lith, &ad1843_gain_LINE, val); - break; - - case SOUND_MIXER_MIC: - val = ad1843_set_gain(&devc->lith, &ad1843_gain_MIC, val); - break; - - case SOUND_MIXER_CD: - val = ad1843_set_gain(&devc->lith, &ad1843_gain_CD, val); - break; - - case SOUND_MIXER_RECLEV: - val = ad1843_set_gain(&devc->lith, &ad1843_gain_RECLEV, val); - break; - - case SOUND_MIXER_RECSRC: - if (devc->rport.swbuf || devc->wport.swbuf) - return -EBUSY; /* can't change recsrc while running */ - val = ad1843_set_recsrc(&devc->lith, val); - break; - - case SOUND_MIXER_OUTSRC: - val = ad1843_set_outsrc(&devc->lith, val); - break; - - default: - return -EINVAL; - } - if (val < 0) - return val; - return put_user(val, (int __user *) arg); -} - -/* This is the ioctl entry to the mixer driver. */ - -static long vwsnd_mixer_ioctl(struct file *file, - unsigned int cmd, - unsigned long arg) -{ - vwsnd_dev_t *devc = (vwsnd_dev_t *) file->private_data; - const unsigned int nrmask = _IOC_NRMASK << _IOC_NRSHIFT; - const unsigned int nr = (cmd & nrmask) >> _IOC_NRSHIFT; - int retval; - - DBGEV("(devc=0x%p, cmd=0x%x, arg=0x%lx)\n", devc, cmd, arg); - - mutex_lock(&vwsnd_mutex); - mutex_lock(&devc->mix_mutex); - { - if ((cmd & ~nrmask) == MIXER_READ(0)) - retval = mixer_read_ioctl(devc, nr, (void __user *) arg); - else if ((cmd & ~nrmask) == MIXER_WRITE(0)) - retval = mixer_write_ioctl(devc, nr, (void __user *) arg); - else - retval = -EINVAL; - } - mutex_unlock(&devc->mix_mutex); - mutex_unlock(&vwsnd_mutex); - return retval; -} - -static const struct file_operations vwsnd_mixer_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .unlocked_ioctl = vwsnd_mixer_ioctl, - .open = vwsnd_mixer_open, - .release = vwsnd_mixer_release, -}; - -/*****************************************************************************/ -/* probe/attach/unload */ - -/* driver probe routine. Return nonzero if hardware is found. */ - -static int __init probe_vwsnd(struct address_info *hw_config) -{ - lithium_t lith; - int w; - unsigned long later; - - DBGEV("(hw_config=0x%p)\n", hw_config); - - /* XXX verify lithium present (to prevent crash on non-vw) */ - - if (li_create(&lith, hw_config->io_base) != 0) { - printk(KERN_WARNING "probe_vwsnd: can't map lithium\n"); - return 0; - } - later = jiffies + 2; - li_writel(&lith, LI_HOST_CONTROLLER, LI_HC_LINK_ENABLE); - do { - w = li_readl(&lith, LI_HOST_CONTROLLER); - } while (w == LI_HC_LINK_ENABLE && time_before(jiffies, later)); - - li_destroy(&lith); - - DBGPV("HC = 0x%04x\n", w); - - if ((w == LI_HC_LINK_ENABLE) || (w & LI_HC_LINK_CODEC)) { - - /* This may indicate a beta machine with no audio, - * or a future machine with different audio. - * On beta-release 320 w/ no audio, HC == 0x4000 */ - - printk(KERN_WARNING "probe_vwsnd: audio codec not found\n"); - return 0; - } - - if (w & LI_HC_LINK_FAILURE) { - printk(KERN_WARNING "probe_vwsnd: can't init audio codec\n"); - return 0; - } - - printk(KERN_INFO "vwsnd: lithium audio at mmio %#x irq %d\n", - hw_config->io_base, hw_config->irq); - - return 1; -} - -/* - * driver attach routine. Initialize driver data structures and - * initialize hardware. A new vwsnd_dev_t is allocated and put - * onto the global list, vwsnd_dev_list. - * - * Return +minor_dev on success, -errno on failure. - */ - -static int __init attach_vwsnd(struct address_info *hw_config) -{ - vwsnd_dev_t *devc = NULL; - int err = -ENOMEM; - - DBGEV("(hw_config=0x%p)\n", hw_config); - - devc = kmalloc(sizeof (vwsnd_dev_t), GFP_KERNEL); - if (devc == NULL) - goto fail0; - - err = li_create(&devc->lith, hw_config->io_base); - if (err) - goto fail1; - - init_waitqueue_head(&devc->open_wait); - - devc->rport.hwbuf_size = HWBUF_SIZE; - devc->rport.hwbuf_vaddr = __get_free_pages(GFP_KERNEL, HWBUF_ORDER); - if (!devc->rport.hwbuf_vaddr) - goto fail2; - devc->rport.hwbuf = (void *) devc->rport.hwbuf_vaddr; - devc->rport.hwbuf_paddr = virt_to_phys(devc->rport.hwbuf); - - /* - * Quote from the NT driver: - * - * // WARNING!!! HACK to setup output dma!!! - * // This is required because even on output there is some data - * // trickling into the input DMA channel. This is a bug in the - * // Lithium microcode. - * // --sde - * - * We set the input side's DMA base address here. It will remain - * valid until the driver is unloaded. - */ - - li_writel(&devc->lith, LI_COMM1_BASE, - devc->rport.hwbuf_paddr >> 8 | 1 << (37 - 8)); - - devc->wport.hwbuf_size = HWBUF_SIZE; - devc->wport.hwbuf_vaddr = __get_free_pages(GFP_KERNEL, HWBUF_ORDER); - if (!devc->wport.hwbuf_vaddr) - goto fail3; - devc->wport.hwbuf = (void *) devc->wport.hwbuf_vaddr; - devc->wport.hwbuf_paddr = virt_to_phys(devc->wport.hwbuf); - DBGP("wport hwbuf = 0x%p\n", devc->wport.hwbuf); - - DBGDO(shut_up++); - err = ad1843_init(&devc->lith); - DBGDO(shut_up--); - if (err) - goto fail4; - - /* install interrupt handler */ - - err = request_irq(hw_config->irq, vwsnd_audio_intr, 0, "vwsnd", devc); - if (err) - goto fail5; - - /* register this device's drivers. */ - - devc->audio_minor = register_sound_dsp(&vwsnd_audio_fops, -1); - if ((err = devc->audio_minor) < 0) { - DBGDO(printk(KERN_WARNING - "attach_vwsnd: register_sound_dsp error %d\n", - err)); - goto fail6; - } - devc->mixer_minor = register_sound_mixer(&vwsnd_mixer_fops, - devc->audio_minor >> 4); - if ((err = devc->mixer_minor) < 0) { - DBGDO(printk(KERN_WARNING - "attach_vwsnd: register_sound_mixer error %d\n", - err)); - goto fail7; - } - - /* Squirrel away device indices for unload routine. */ - - hw_config->slots[0] = devc->audio_minor; - - /* Initialize as much of *devc as possible */ - - mutex_init(&devc->open_mutex); - mutex_init(&devc->io_mutex); - mutex_init(&devc->mix_mutex); - devc->open_mode = 0; - spin_lock_init(&devc->rport.lock); - init_waitqueue_head(&devc->rport.queue); - devc->rport.swstate = SW_OFF; - devc->rport.hwstate = HW_STOPPED; - devc->rport.flags = 0; - devc->rport.swbuf = NULL; - spin_lock_init(&devc->wport.lock); - init_waitqueue_head(&devc->wport.queue); - devc->wport.swstate = SW_OFF; - devc->wport.hwstate = HW_STOPPED; - devc->wport.flags = 0; - devc->wport.swbuf = NULL; - - /* Success. Link us onto the local device list. */ - - devc->next_dev = vwsnd_dev_list; - vwsnd_dev_list = devc; - return devc->audio_minor; - - /* So many ways to fail. Undo what we did. */ - - fail7: - unregister_sound_dsp(devc->audio_minor); - fail6: - free_irq(hw_config->irq, devc); - fail5: - fail4: - free_pages(devc->wport.hwbuf_vaddr, HWBUF_ORDER); - fail3: - free_pages(devc->rport.hwbuf_vaddr, HWBUF_ORDER); - fail2: - li_destroy(&devc->lith); - fail1: - kfree(devc); - fail0: - return err; -} - -static int __exit unload_vwsnd(struct address_info *hw_config) -{ - vwsnd_dev_t *devc, **devcp; - - DBGE("()\n"); - - devcp = &vwsnd_dev_list; - while ((devc = *devcp)) { - if (devc->audio_minor == hw_config->slots[0]) { - *devcp = devc->next_dev; - break; - } - devcp = &devc->next_dev; - } - - if (!devc) - return -ENODEV; - - unregister_sound_mixer(devc->mixer_minor); - unregister_sound_dsp(devc->audio_minor); - free_irq(hw_config->irq, devc); - free_pages(devc->wport.hwbuf_vaddr, HWBUF_ORDER); - free_pages(devc->rport.hwbuf_vaddr, HWBUF_ORDER); - li_destroy(&devc->lith); - kfree(devc); - - return 0; -} - -/*****************************************************************************/ -/* initialization and loadable kernel module interface */ - -static struct address_info the_hw_config = { - 0xFF001000, /* lithium phys addr */ - CO_IRQ(CO_APIC_LI_AUDIO) /* irq */ -}; - -MODULE_DESCRIPTION("SGI Visual Workstation sound module"); -MODULE_AUTHOR("Bob Miller <kbob@sgi.com>"); -MODULE_LICENSE("GPL"); - -static int __init init_vwsnd(void) -{ - int err; - - DBGXV("\n"); - DBGXV("sound::vwsnd::init_module()\n"); - - if (!probe_vwsnd(&the_hw_config)) - return -ENODEV; - - err = attach_vwsnd(&the_hw_config); - if (err < 0) - return err; - return 0; -} - -static void __exit cleanup_vwsnd(void) -{ - DBGX("sound::vwsnd::cleanup_module()\n"); - - unload_vwsnd(&the_hw_config); -} - -module_init(init_vwsnd); -module_exit(cleanup_vwsnd); |