diff options
Diffstat (limited to 'sound/soc/codecs/rt5677-spi.c')
-rw-r--r-- | sound/soc/codecs/rt5677-spi.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/sound/soc/codecs/rt5677-spi.c b/sound/soc/codecs/rt5677-spi.c new file mode 100644 index 000000000000..11c38f3a9b72 --- /dev/null +++ b/sound/soc/codecs/rt5677-spi.c @@ -0,0 +1,128 @@ +/* + * rt5677-spi.c -- RT5677 ALSA SoC audio codec driver + * + * Copyright 2013 Realtek Semiconductor Corp. + * Author: Oder Chiou <oder_chiou@realtek.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/input.h> +#include <linux/spi/spi.h> +#include <linux/device.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/slab.h> +#include <linux/gpio.h> +#include <linux/sched.h> +#include <linux/kthread.h> +#include <linux/uaccess.h> +#include <linux/miscdevice.h> +#include <linux/regulator/consumer.h> +#include <linux/pm_qos.h> +#include <linux/sysfs.h> +#include <linux/clk.h> +#include <linux/firmware.h> + +#include "rt5677-spi.h" + +static struct spi_device *g_spi; + +/** + * rt5677_spi_write - Write data to SPI. + * @txbuf: Data Buffer for writing. + * @len: Data length. + * + * + * Returns true for success. + */ +int rt5677_spi_write(u8 *txbuf, size_t len) +{ + int status; + + status = spi_write(g_spi, txbuf, len); + + if (status) + dev_err(&g_spi->dev, "rt5677_spi_write error %d\n", status); + + return status; +} + +/** + * rt5677_spi_burst_write - Write data to SPI by rt5677 dsp memory address. + * @addr: Start address. + * @txbuf: Data Buffer for writng. + * @len: Data length, it must be a multiple of 8. + * + * + * Returns true for success. + */ +int rt5677_spi_burst_write(u32 addr, const struct firmware *fw) +{ + u8 spi_cmd = RT5677_SPI_CMD_BURST_WRITE; + u8 *write_buf; + unsigned int i, end, offset = 0; + + write_buf = kmalloc(RT5677_SPI_BUF_LEN + 6, GFP_KERNEL); + + if (write_buf == NULL) + return -ENOMEM; + + while (offset < fw->size) { + if (offset + RT5677_SPI_BUF_LEN <= fw->size) + end = RT5677_SPI_BUF_LEN; + else + end = fw->size % RT5677_SPI_BUF_LEN; + + write_buf[0] = spi_cmd; + write_buf[1] = ((addr + offset) & 0xff000000) >> 24; + write_buf[2] = ((addr + offset) & 0x00ff0000) >> 16; + write_buf[3] = ((addr + offset) & 0x0000ff00) >> 8; + write_buf[4] = ((addr + offset) & 0x000000ff) >> 0; + + for (i = 0; i < end; i += 8) { + write_buf[i + 12] = fw->data[offset + i + 0]; + write_buf[i + 11] = fw->data[offset + i + 1]; + write_buf[i + 10] = fw->data[offset + i + 2]; + write_buf[i + 9] = fw->data[offset + i + 3]; + write_buf[i + 8] = fw->data[offset + i + 4]; + write_buf[i + 7] = fw->data[offset + i + 5]; + write_buf[i + 6] = fw->data[offset + i + 6]; + write_buf[i + 5] = fw->data[offset + i + 7]; + } + + write_buf[end + 5] = spi_cmd; + + rt5677_spi_write(write_buf, end + 6); + + offset += RT5677_SPI_BUF_LEN; + } + + kfree(write_buf); + + return 0; +} + +static int rt5677_spi_probe(struct spi_device *spi) +{ + g_spi = spi; + return 0; +} + +static struct spi_driver rt5677_spi_driver = { + .driver = { + .name = "rt5677", + .owner = THIS_MODULE, + }, + .probe = rt5677_spi_probe, +}; +module_spi_driver(rt5677_spi_driver); + +MODULE_DESCRIPTION("ASoC RT5677 SPI driver"); +MODULE_AUTHOR("Oder Chiou <oder_chiou@realtek.com>"); +MODULE_LICENSE("GPL v2"); |