Staging: pcc-acpi: update to latest version

Import the changes from the upstream driver into this version to keep
things up to date.

Cc: Yokota Hiroshi <yokota@netlab.cs.tsukuba.ac.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 309 insertions, 231 deletions

diff --git a/drivers/staging/pcc-acpi/pcc-acpi.c b/drivers/staging/pcc-acpi/pcc-acpi.c
index ffda32a10303..e44181ead26d 100644
--- a/drivers/staging/pcc-acpi/pcc-acpi.c
+++ b/drivers/staging/pcc-acpi/pcc-acpi.c
@@ -94,20 +94,21 @@
  *
  */
 
-#define ACPI_PCC_VERSION	"0.9"
+#define ACPI_PCC_VERSION	"0.9+hy"
 
-#include <linux/version.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include <asm/uaccess.h>
+#include <linux/ctype.h>
+#include <linux/init.h>
+#include <linux/input.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/init.h>
-#include <linux/types.h>
 #include <linux/proc_fs.h>
-#include <linux/ctype.h>
 #include <linux/seq_file.h>
-#include <asm/uaccess.h>
-#include <acpi/acpi_bus.h>
-#include <acpi/acpi_drivers.h>
-#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/version.h>
 
 
 /*************************************************************************
@@ -152,10 +153,10 @@ static int _open_func_name_(struct inode *inode, struct file *file) \
 #endif
 
 #define _COMPONENT		ACPI_HOTKEY_COMPONENT
-ACPI_MODULE_NAME("pcc_acpi")
+ACPI_MODULE_NAME("pcc_acpi");
 
-MODULE_AUTHOR("Hiroshi Miura");
-MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Lets Note laptops");
+MODULE_AUTHOR("Hiroshi Miura, Hiroshi Yokota");
+MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops");
 MODULE_LICENSE("GPL");
 
 #define LOGPREFIX "pcc_acpi: "
@@ -182,7 +183,7 @@ MODULE_LICENSE("GPL");
  * definitions for /proc/ interface
  *
  *******************************************************************/
-#define ACPI_PCC_DRIVER_NAME	"PCC Extra Driver"
+#define ACPI_PCC_DRIVER_NAME	"pcc_acpi"
 #define ACPI_PCC_DEVICE_NAME	"PCCExtra"
 #define ACPI_PCC_CLASS		"pcc"
 #define PROC_PCC		ACPI_PCC_CLASS
@@ -196,6 +197,12 @@ MODULE_LICENSE("GPL");
 
 #define PROC_STR_MAX_LEN  8
 
+#define BUS_PCC_HOTKEY BUS_I8042 /*0x1a*/ /* FIXME: BUS_I8042? */
+
+/* Fn+F4/F5 confricts with Shift+F1/F2  */
+/* This hack avoids key number confrict */
+#define PCC_KEYINPUT_MODE (0)
+
 /* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent
    ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00
 */
@@ -209,27 +216,32 @@ enum SINF_BITS { SINF_NUM_BATTERIES = 0,
 		 SINF_STICKY_KEY = 0x80,
 };
 
-static int acpi_pcc_hotkey_add(struct acpi_device *device);
-static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type);
-static int acpi_pcc_hotkey_resume(struct acpi_device *device);
-
-static const struct acpi_device_id pcc_device_ids[] = {
+static struct acpi_device_id pcc_device_ids[] = {
 	{"MAT0012", 0},
 	{"MAT0013", 0},
 	{"MAT0018", 0},
 	{"MAT0019", 0},
-	{"", 0},
+	{"",	    0},
 };
 MODULE_DEVICE_TABLE(acpi, pcc_device_ids);
 
+
+static int __devinit acpi_pcc_hotkey_add(struct acpi_device *device);
+static int __devexit acpi_pcc_hotkey_remove(struct acpi_device *device, int type);
+static int acpi_pcc_hotkey_resume(struct acpi_device *device);
+
+
 static struct acpi_driver acpi_pcc_driver = {
 	.name =		ACPI_PCC_DRIVER_NAME,
 	.class =	ACPI_PCC_CLASS,
 	.ids =		pcc_device_ids,
 	.ops =		{
 				.add =		acpi_pcc_hotkey_add,
-				.remove =	acpi_pcc_hotkey_remove,
+				.remove =	__devexit_p(acpi_pcc_hotkey_remove),
+#ifdef CONFIG_PM
+				/*.suspend =      acpi_pcc_hotkey_suspend,*/
 				.resume =       acpi_pcc_hotkey_resume,
+#endif
 			},
 };
 
@@ -248,9 +260,12 @@ struct pcc_keyinput {
 	int key_mode;
 };
 
-/* --------------------------------------------------------------------------
+/* *************************************************************************
+   Hotkey driver core
+   ************************************************************************* */
+/* -------------------------------------------------------------------------
                            method access functions
-   -------------------------------------------------------------------------- */
+   ------------------------------------------------------------------------- */
 static int acpi_pcc_write_sset(struct acpi_hotkey *hotkey, int func, int val)
 {
 	union acpi_object in_objs[] = {
@@ -263,13 +278,13 @@ static int acpi_pcc_write_sset(struct acpi_hotkey *hotkey, int func, int val)
 		.count   = ARRAY_SIZE(in_objs),
 		.pointer = in_objs,
 	};
-	acpi_status status = AE_OK;
+	acpi_status status;
 
 	ACPI_FUNCTION_TRACE("acpi_pcc_write_sset");
 
 	status = acpi_evaluate_object(hotkey->handle, METHOD_HKEY_SSET, &params, NULL);
 
-	return_VALUE(status == AE_OK);
+	return_VALUE(status == AE_OK ? AE_OK : AE_ERROR);
 }
 
 static inline int acpi_pcc_get_sqty(struct acpi_device *device)
@@ -301,19 +316,20 @@ static int acpi_pcc_retrieve_biosdata(struct acpi_hotkey *hotkey, u32* sinf)
 	status = acpi_evaluate_object(hotkey->handle, METHOD_HKEY_SINF, 0 , &buffer);
 	if (ACPI_FAILURE(status)) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "evaluation error HKEY.SINF\n"));
-		return_VALUE(0);
+		status = AE_ERROR;
+		return_VALUE(status);
 	}
 
 	hkey = buffer.pointer;
 	if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
-		goto end;
+		goto free_buffer;
 	}
 
 	if (hotkey->num_sifr < hkey->package.count) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "SQTY reports bad SINF length\n"));
 		status = AE_ERROR;
-		goto end;
+		goto free_buffer;
 	}
 
 	for (i = 0; i < hkey->package.count; i++) {
@@ -322,59 +338,54 @@ static int acpi_pcc_retrieve_biosdata(struct acpi_hotkey *hotkey, u32* sinf)
 			sinf[i] = element->integer.value;
 		} else {
 			ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF data\n"));
+			status = AE_ERROR;
+			break;
 		}
 	}
 	sinf[hkey->package.count] = -1;
 
-end:
+ free_buffer:
 	kfree(buffer.pointer);
-	return_VALUE(status == AE_OK);
+	return_VALUE(status == AE_OK ? AE_OK : AE_ERROR);
 }
 
 static int acpi_pcc_read_sinf_field(struct seq_file *seq, int field)
 {
 	struct acpi_hotkey *hotkey = (struct acpi_hotkey *) seq->private;
-	u32* sinf = kmalloc(sizeof(u32) * (hotkey->num_sifr + 1), GFP_KERNEL);
+	u32 sinf[hotkey->num_sifr + 1];
 
 	ACPI_FUNCTION_TRACE("acpi_pcc_read_sinf_field");
 
-	if (!sinf) {
-		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Couldn't allocate %li bytes\n",
-		       sizeof(u32) * hotkey->num_sifr));
-		return_VALUE(0);
-	}
-
-	if (acpi_pcc_retrieve_biosdata(hotkey, sinf)) {
+	if (ACPI_SUCCESS(acpi_pcc_retrieve_biosdata(hotkey, sinf))) {
 		seq_printf(seq, "%u\n",	sinf[field]);
 	} else {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Couldn't retrieve BIOS data\n"));
 	}
 
-	kfree(sinf);
-	return_VALUE(0);
+	return_VALUE(AE_OK);
 }
 
-/* --------------------------------------------------------------------------
+/* -------------------------------------------------------------------------
                        user interface functions
-   -------------------------------------------------------------------------- */
+   ------------------------------------------------------------------------- */
 /* read methods */
 /* Sinf read methods */
 #define PCC_SINF_READ_F(_name_, FUNC) \
 static int _name_  (struct seq_file *seq, void *offset) \
 { \
-	return acpi_pcc_read_sinf_field(seq, (FUNC)); \
+	return_VALUE(ACPI_SUCCESS(acpi_pcc_read_sinf_field(seq, (FUNC)))  ? 0 : -EINVAL); \
 }
 
-PCC_SINF_READ_F(acpi_pcc_numbatteries_show,      SINF_NUM_BATTERIES);
-PCC_SINF_READ_F(acpi_pcc_lcdtype_show,           SINF_LCD_TYPE);
+PCC_SINF_READ_F(acpi_pcc_numbatteries_show,	 SINF_NUM_BATTERIES);
+PCC_SINF_READ_F(acpi_pcc_lcdtype_show,		 SINF_LCD_TYPE);
 PCC_SINF_READ_F(acpi_pcc_ac_brightness_max_show, SINF_AC_MAX_BRIGHT);
 PCC_SINF_READ_F(acpi_pcc_ac_brightness_min_show, SINF_AC_MIN_BRIGHT);
-PCC_SINF_READ_F(acpi_pcc_ac_brightness_show,     SINF_AC_CUR_BRIGHT);
+PCC_SINF_READ_F(acpi_pcc_ac_brightness_show,	 SINF_AC_CUR_BRIGHT);
 PCC_SINF_READ_F(acpi_pcc_dc_brightness_max_show, SINF_DC_MAX_BRIGHT);
 PCC_SINF_READ_F(acpi_pcc_dc_brightness_min_show, SINF_DC_MIN_BRIGHT);
-PCC_SINF_READ_F(acpi_pcc_dc_brightness_show,     SINF_DC_CUR_BRIGHT);
-PCC_SINF_READ_F(acpi_pcc_brightness_show,        SINF_AC_CUR_BRIGHT);
-PCC_SINF_READ_F(acpi_pcc_mute_show,              SINF_MUTE);
+PCC_SINF_READ_F(acpi_pcc_dc_brightness_show,	 SINF_DC_CUR_BRIGHT);
+PCC_SINF_READ_F(acpi_pcc_brightness_show,	 SINF_AC_CUR_BRIGHT);
+PCC_SINF_READ_F(acpi_pcc_mute_show,		 SINF_MUTE);
 
 static int acpi_pcc_sticky_key_show(struct seq_file *seq, void *offset)
 {
@@ -383,7 +394,7 @@ static int acpi_pcc_sticky_key_show(struct seq_file *seq, void *offset)
 	ACPI_FUNCTION_TRACE("acpi_pcc_sticky_key_show");
 
 	if (!hotkey || !hotkey->device) {
-		return_VALUE(0);
+		return_VALUE(-EINVAL);
 	}
 
 	seq_printf(seq, "%d\n", hotkey->sticky_mode);
@@ -410,8 +421,9 @@ static int acpi_pcc_version_show(struct seq_file *seq, void *offset)
 
 	ACPI_FUNCTION_TRACE("acpi_pcc_version_show");
 
-	if (!hotkey || !hotkey->device)
-		return 0;
+	if (!hotkey || !hotkey->device) {
+		return_VALUE(-EINVAL);
+	}
 
 	seq_printf(seq, "%s version %s\n", ACPI_PCC_DRIVER_NAME, ACPI_PCC_VERSION);
 	seq_printf(seq, "%li functions\n", hotkey->num_sifr);
@@ -421,27 +433,28 @@ static int acpi_pcc_version_show(struct seq_file *seq, void *offset)
 
 /* write methods */
 static ssize_t acpi_pcc_write_single_flag (struct file *file,
-                                           const char __user *buffer,
-                                           size_t count,
-                                           int sinf_func)
+					   const char __user *buffer,
+					   size_t count,
+					   int sinf_func)
 {
 	struct seq_file		*seq = file->private_data;
 	struct acpi_hotkey	*hotkey = seq->private;
 	char			write_string[PROC_STR_MAX_LEN];
-	u32 			val;
+	u32			val;
 
 	ACPI_FUNCTION_TRACE("acpi_pcc_write_single_flag");
 
 	if (!hotkey || (count > sizeof(write_string) - 1)) {
 		return_VALUE(-EINVAL);
-        }
+	}
 
 	if (copy_from_user(write_string, buffer, count)) {
 		return_VALUE(-EFAULT);
-        }
+	}
 	write_string[count] = '\0';
 
-	if (sscanf(write_string, "%i", &val) == 1 && (val == 0 || val == 1)) {
+	if ((sscanf(write_string, "%3i", &val) == 1) &&
+	    (val == 0 || val == 1)) {
 		acpi_pcc_write_sset(hotkey, sinf_func, val);
 	}
 
@@ -457,53 +470,51 @@ static unsigned long acpi_pcc_write_brightness(struct file *file, const char __u
 	struct acpi_hotkey	*hotkey = (struct acpi_hotkey *)seq->private;
 	char			write_string[PROC_STR_MAX_LEN];
 	u32 bright;
-	u32* sinf = kmalloc(sizeof(u32) * (hotkey->num_sifr + 1), GFP_KERNEL);
+	u32 sinf[hotkey->num_sifr + 1];
 
 	ACPI_FUNCTION_TRACE("acpi_pcc_write_brightness");
 
-	if (!hotkey || (count > sizeof(write_string) - 1))
+	if (!hotkey || (count > sizeof(write_string) - 1)) {
 		return_VALUE(-EINVAL);
-
-	if (!sinf) {
-		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Couldn't allocate %li bytes\n",
-		       sizeof(u32) * hotkey->num_sifr));
-		return_VALUE(-EFAULT);
 	}
 
-	if (copy_from_user(write_string, buffer, count))
+	if (copy_from_user(write_string, buffer, count)) {
 		return_VALUE(-EFAULT);
+	}
 
 	write_string[count] = '\0';
 
-	if (!acpi_pcc_retrieve_biosdata(hotkey, sinf)) {
+	if (ACPI_FAILURE(acpi_pcc_retrieve_biosdata(hotkey, sinf))) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Couldn't retrieve BIOS data\n"));
 		goto end;
 	}
 
-	if (sscanf(write_string, "%i", &bright) == 1 &&
-		bright >= sinf[min_index] && bright <= sinf[max_index]) {
-			acpi_pcc_write_sset(hotkey, cur_index, bright);
+	if ((sscanf(write_string, "%4i", &bright) == 1) &&
+	    (bright >= sinf[min_index]                ) &&
+	    (bright <= sinf[max_index]                )) {
+		acpi_pcc_write_sset(hotkey, cur_index, bright);
 	}
 
 end:
-	kfree(sinf);
 	return_VALUE(count);
 }
 
 static ssize_t acpi_pcc_write_ac_brightness(struct file *file, const char __user *buffer,
 					 size_t count, loff_t *ppos)
 {
-	return acpi_pcc_write_brightness(file, buffer, count, SINF_AC_MIN_BRIGHT,
-					 SINF_AC_MAX_BRIGHT,
-					 SINF_AC_CUR_BRIGHT);
+	return_VALUE(acpi_pcc_write_brightness(file, buffer, count,
+					       SINF_AC_MIN_BRIGHT,
+					       SINF_AC_MAX_BRIGHT,
+					       SINF_AC_CUR_BRIGHT));
 }
 
 static ssize_t acpi_pcc_write_dc_brightness(struct file *file, const char __user *buffer,
 					 size_t count, loff_t *ppos)
 {
-	return acpi_pcc_write_brightness(file, buffer, count, SINF_DC_MIN_BRIGHT,
-					 SINF_DC_MAX_BRIGHT,
-					 SINF_DC_CUR_BRIGHT);
+	return_VALUE(acpi_pcc_write_brightness(file, buffer, count,
+					       SINF_DC_MIN_BRIGHT,
+					       SINF_DC_MAX_BRIGHT,
+					       SINF_DC_CUR_BRIGHT));
 }
 
 static ssize_t acpi_pcc_write_no_brightness(struct file *file, const char __user *buffer,
@@ -518,14 +529,36 @@ static ssize_t acpi_pcc_write_mute (struct file *file,
 				    const char __user *buffer,
 				    size_t count, loff_t *ppos)
 {
-	return acpi_pcc_write_single_flag(file, buffer, count, SINF_MUTE);
+	return_VALUE(acpi_pcc_write_single_flag(file, buffer, count, SINF_MUTE));
 }
 
 static ssize_t acpi_pcc_write_sticky_key (struct file *file,
 					  const char __user *buffer,
 					  size_t count, loff_t *ppos)
 {
-	return acpi_pcc_write_single_flag(file, buffer, count, SINF_STICKY_KEY);
+	struct seq_file     *seq = (struct seq_file *)file->private_data;
+	struct acpi_hotkey  *hotkey = (struct acpi_hotkey *)seq->private;
+	char                 write_string[PROC_STR_MAX_LEN];
+	int                  mode;
+
+	ACPI_FUNCTION_TRACE("acpi_pcc_write_sticky_key");
+
+	if (!hotkey || (count > sizeof(write_string) - 1)) {
+		return_VALUE(-EINVAL);
+	}
+
+	if (copy_from_user(write_string, buffer, count)) {
+		return_VALUE(-EFAULT);
+	}
+	write_string[count] = '\0';
+
+	if ((sscanf(write_string, "%3i", &mode) == 1) &&
+	    (mode == 0 || mode == 1)) {
+		acpi_pcc_write_sset(hotkey, SINF_STICKY_KEY, mode);
+		hotkey->sticky_mode = mode;
+	}
+
+	return_VALUE(count);
 }
 
 static ssize_t acpi_pcc_write_keyinput(struct file *file, const char __user *buffer,
@@ -539,25 +572,28 @@ static ssize_t acpi_pcc_write_keyinput(struct file *file, const char __user *buf
 
 	ACPI_FUNCTION_TRACE("acpi_pcc_write_keyinput");
 
-	if (!hotkey || (count > sizeof(write_string) - 1))
+	if (!hotkey || (count > (sizeof(write_string) - 1))) {
 		return_VALUE(-EINVAL);
+	}
 
-	if (copy_from_user(write_string, buffer, count))
+	if (copy_from_user(write_string, buffer, count)) {
 		return_VALUE(-EFAULT);
+	}
 
 	write_string[count] = '\0';
 
-	if (sscanf(write_string, "%i", &key_mode) == 1 && (key_mode == 0 || key_mode == 1)) {
-		keyinput = (struct pcc_keyinput *)input_get_drvdata(hotkey->input_dev);
+	if ((sscanf(write_string, "%4i", &key_mode) == 1) &&
+	    (key_mode == 0 || key_mode == 1)) {
+		keyinput = input_get_drvdata(hotkey->input_dev);
 		keyinput->key_mode = key_mode;
 	}
 
 	return_VALUE(count);
 }
 
-/* --------------------------------------------------------------------------
+/* -------------------------------------------------------------------------
                             hotkey driver
-   -------------------------------------------------------------------------- */
+   ------------------------------------------------------------------------- */
 static void acpi_pcc_generete_keyinput(struct acpi_hotkey *hotkey)
 {
 	struct input_dev    *hotk_input_dev = hotkey->input_dev;
@@ -640,38 +676,38 @@ void acpi_pcc_hotkey_notify(acpi_handle handle, u32 event, void *data)
 	return_VOID;
 }
 
-/* --------------------------------------------------------------------------
-                              FS Interface (/proc)
-   -------------------------------------------------------------------------- */
+/* *************************************************************************
+   FS Interface (/proc)
+   ************************************************************************* */
 /* oepn proc file fs*/
-SEQ_OPEN_FS(acpi_pcc_dc_brightness_open_fs, acpi_pcc_dc_brightness_show);
-SEQ_OPEN_FS(acpi_pcc_numbatteries_open_fs,  acpi_pcc_numbatteries_show);
-SEQ_OPEN_FS(acpi_pcc_lcdtype_open_fs,  acpi_pcc_lcdtype_show);
+SEQ_OPEN_FS(acpi_pcc_dc_brightness_open_fs,	acpi_pcc_dc_brightness_show);
+SEQ_OPEN_FS(acpi_pcc_numbatteries_open_fs,	acpi_pcc_numbatteries_show);
+SEQ_OPEN_FS(acpi_pcc_lcdtype_open_fs,		acpi_pcc_lcdtype_show);
 SEQ_OPEN_FS(acpi_pcc_ac_brightness_max_open_fs, acpi_pcc_ac_brightness_max_show);
-SEQ_OPEN_FS(acpi_pcc_ac_brightness_min_open_fs,  acpi_pcc_ac_brightness_min_show);
-SEQ_OPEN_FS(acpi_pcc_ac_brightness_open_fs, acpi_pcc_ac_brightness_show);
+SEQ_OPEN_FS(acpi_pcc_ac_brightness_min_open_fs, acpi_pcc_ac_brightness_min_show);
+SEQ_OPEN_FS(acpi_pcc_ac_brightness_open_fs,	acpi_pcc_ac_brightness_show);
 SEQ_OPEN_FS(acpi_pcc_dc_brightness_max_open_fs, acpi_pcc_dc_brightness_max_show);
 SEQ_OPEN_FS(acpi_pcc_dc_brightness_min_open_fs, acpi_pcc_dc_brightness_min_show);
-SEQ_OPEN_FS(acpi_pcc_brightness_open_fs,  acpi_pcc_brightness_show);
-SEQ_OPEN_FS(acpi_pcc_mute_open_fs, acpi_pcc_mute_show);
-SEQ_OPEN_FS(acpi_pcc_version_open_fs, acpi_pcc_version_show);
-SEQ_OPEN_FS(acpi_pcc_keyinput_open_fs, acpi_pcc_keyinput_show);
-SEQ_OPEN_FS(acpi_pcc_sticky_key_open_fs, acpi_pcc_sticky_key_show);
+SEQ_OPEN_FS(acpi_pcc_brightness_open_fs,	acpi_pcc_brightness_show);
+SEQ_OPEN_FS(acpi_pcc_mute_open_fs,		acpi_pcc_mute_show);
+SEQ_OPEN_FS(acpi_pcc_version_open_fs,		acpi_pcc_version_show);
+SEQ_OPEN_FS(acpi_pcc_keyinput_open_fs,		acpi_pcc_keyinput_show);
+SEQ_OPEN_FS(acpi_pcc_sticky_key_open_fs,	acpi_pcc_sticky_key_show);
 
 typedef struct file_operations fops_t;
-static fops_t acpi_pcc_numbatteries_fops = SEQ_FILEOPS_R (acpi_pcc_numbatteries_open_fs);
-static fops_t acpi_pcc_lcdtype_fops = SEQ_FILEOPS_R (acpi_pcc_lcdtype_open_fs);
-static fops_t acpi_pcc_mute_fops = SEQ_FILEOPS_RW(acpi_pcc_mute_open_fs, acpi_pcc_write_mute);
-static fops_t acpi_pcc_ac_brightness_fops = SEQ_FILEOPS_RW(acpi_pcc_ac_brightness_open_fs, acpi_pcc_write_ac_brightness);
-static fops_t acpi_pcc_ac_brightness_max_fops = SEQ_FILEOPS_R(acpi_pcc_ac_brightness_max_open_fs);
-static fops_t acpi_pcc_ac_brightness_min_fops = SEQ_FILEOPS_R(acpi_pcc_ac_brightness_min_open_fs);
-static fops_t acpi_pcc_dc_brightness_fops = SEQ_FILEOPS_RW(acpi_pcc_dc_brightness_open_fs, acpi_pcc_write_dc_brightness);
-static fops_t acpi_pcc_dc_brightness_max_fops = SEQ_FILEOPS_R(acpi_pcc_dc_brightness_max_open_fs);
-static fops_t acpi_pcc_dc_brightness_min_fops = SEQ_FILEOPS_R(acpi_pcc_dc_brightness_min_open_fs);
-static fops_t acpi_pcc_brightness_fops = SEQ_FILEOPS_RW(acpi_pcc_brightness_open_fs, acpi_pcc_write_no_brightness);
-static fops_t acpi_pcc_sticky_key_fops = SEQ_FILEOPS_RW(acpi_pcc_sticky_key_open_fs, acpi_pcc_write_sticky_key);
-static fops_t acpi_pcc_keyinput_fops = SEQ_FILEOPS_RW(acpi_pcc_keyinput_open_fs, acpi_pcc_write_keyinput);
-static fops_t acpi_pcc_version_fops = SEQ_FILEOPS_R (acpi_pcc_version_open_fs);
+static fops_t acpi_pcc_numbatteries_fops      = SEQ_FILEOPS_R (acpi_pcc_numbatteries_open_fs);
+static fops_t acpi_pcc_lcdtype_fops           = SEQ_FILEOPS_R (acpi_pcc_lcdtype_open_fs);
+static fops_t acpi_pcc_mute_fops              = SEQ_FILEOPS_RW(acpi_pcc_mute_open_fs, acpi_pcc_write_mute);
+static fops_t acpi_pcc_ac_brightness_fops     = SEQ_FILEOPS_RW(acpi_pcc_ac_brightness_open_fs, acpi_pcc_write_ac_brightness);
+static fops_t acpi_pcc_ac_brightness_max_fops = SEQ_FILEOPS_R (acpi_pcc_ac_brightness_max_open_fs);
+static fops_t acpi_pcc_ac_brightness_min_fops = SEQ_FILEOPS_R (acpi_pcc_ac_brightness_min_open_fs);
+static fops_t acpi_pcc_dc_brightness_fops     = SEQ_FILEOPS_RW(acpi_pcc_dc_brightness_open_fs, acpi_pcc_write_dc_brightness);
+static fops_t acpi_pcc_dc_brightness_max_fops = SEQ_FILEOPS_R (acpi_pcc_dc_brightness_max_open_fs);
+static fops_t acpi_pcc_dc_brightness_min_fops = SEQ_FILEOPS_R (acpi_pcc_dc_brightness_min_open_fs);
+static fops_t acpi_pcc_brightness_fops        = SEQ_FILEOPS_RW(acpi_pcc_brightness_open_fs, acpi_pcc_write_no_brightness);
+static fops_t acpi_pcc_sticky_key_fops        = SEQ_FILEOPS_RW(acpi_pcc_sticky_key_open_fs, acpi_pcc_write_sticky_key);
+static fops_t acpi_pcc_keyinput_fops          = SEQ_FILEOPS_RW(acpi_pcc_keyinput_open_fs, acpi_pcc_write_keyinput);
+static fops_t acpi_pcc_version_fops           = SEQ_FILEOPS_R (acpi_pcc_version_open_fs);
 
 typedef struct _ProcItem
 {
@@ -681,37 +717,35 @@ typedef struct _ProcItem
 } ProcItem;
 
 /* Note: These functions map *exactly* to the SINF/SSET functions */
-ProcItem pcc_proc_items_sifr[] =
-{
-	{ "num_batteries",      &acpi_pcc_numbatteries_fops,     S_IRUGO },
-	{ "lcd_type",           &acpi_pcc_lcdtype_fops,          S_IRUGO },
+ProcItem acpi_pcc_proc_items_sifr[] = {
+	{ "num_batteries",	&acpi_pcc_numbatteries_fops,	 S_IRUGO },
+	{ "lcd_type",		&acpi_pcc_lcdtype_fops,		 S_IRUGO },
 	{ "ac_brightness_max" , &acpi_pcc_ac_brightness_max_fops,S_IRUGO },
 	{ "ac_brightness_min" , &acpi_pcc_ac_brightness_min_fops,S_IRUGO },
-	{ "ac_brightness" ,     &acpi_pcc_ac_brightness_fops,    S_IFREG | S_IRUGO | S_IWUSR },
+	{ "ac_brightness" ,	&acpi_pcc_ac_brightness_fops,	 S_IFREG | S_IRUGO | S_IWUSR },
 	{ "dc_brightness_max" , &acpi_pcc_dc_brightness_max_fops,S_IRUGO },
 	{ "dc_brightness_min" , &acpi_pcc_dc_brightness_min_fops,S_IRUGO },
-	{ "dc_brightness" ,     &acpi_pcc_dc_brightness_fops,    S_IFREG | S_IRUGO | S_IWUSR },
-	{ "brightness" ,        &acpi_pcc_brightness_fops,    S_IFREG | S_IRUGO | S_IWUSR },
-	{ "mute",               &acpi_pcc_mute_fops,             S_IFREG | S_IRUGO | S_IWUSR },
+	{ "dc_brightness" ,	&acpi_pcc_dc_brightness_fops,	 S_IFREG | S_IRUGO | S_IWUSR },
+	{ "brightness" ,	&acpi_pcc_brightness_fops,    S_IFREG | S_IRUGO | S_IWUSR },
+	{ "mute",		&acpi_pcc_mute_fops,		 S_IFREG | S_IRUGO | S_IWUSR },
 	{ NULL, NULL, 0 },
 };
 
-ProcItem pcc_proc_items[] =
-{
+ProcItem acpi_pcc_proc_items[] = {
 	{ "sticky_key",		&acpi_pcc_sticky_key_fops,	 S_IFREG | S_IRUGO | S_IWUSR },
-	{ "keyinput",           &acpi_pcc_keyinput_fops,         S_IFREG | S_IRUGO | S_IWUSR },
-	{ "version",            &acpi_pcc_version_fops,          S_IRUGO },
+	{ "keyinput",		&acpi_pcc_keyinput_fops,	 S_IFREG | S_IRUGO | S_IWUSR },
+	{ "version",		&acpi_pcc_version_fops,		 S_IRUGO },
 	{ NULL, NULL, 0 },
 };
 
-static int acpi_pcc_add_device(struct acpi_device *device,
-                                      ProcItem *proc_items,
-                                      int num)
+static int __devinit acpi_pcc_add_device(struct acpi_device *device,
+					 ProcItem *proc_items,
+					 int num)
 {
+	struct acpi_hotkey *hotkey = (struct acpi_hotkey*)acpi_driver_data(device);
 	struct proc_dir_entry* proc;
 	ProcItem* item;
 	int i;
-	struct acpi_hotkey *hotkey = (struct acpi_hotkey*)acpi_driver_data(device);
 
 	for (item = proc_items, i = 0; item->name && i < num; ++item, ++i) {
 		proc = create_proc_entry(item->name, item->flag, hotkey->proc_dir_entry);
@@ -724,16 +758,16 @@ static int acpi_pcc_add_device(struct acpi_device *device,
 				item--;
 				remove_proc_entry(item->name, hotkey->proc_dir_entry);
 			}
-			return -ENODEV;
+			return_VALUE(-ENODEV);
 		}
 	}
-	return 0;
+	return_VALUE(0);
 }
 
-static int acpi_pcc_proc_init(struct acpi_device *device)
+static int __devinit acpi_pcc_proc_init(struct acpi_device *device)
 {
-	struct proc_dir_entry* acpi_pcc_dir;
-	struct acpi_hotkey *hotkey = (struct acpi_hotkey*)acpi_driver_data(device);
+	struct proc_dir_entry *acpi_pcc_dir;
+	struct acpi_hotkey    *hotkey = (struct acpi_hotkey*)acpi_driver_data(device);
 	acpi_status status;
 
 	ACPI_FUNCTION_TRACE("acpi_pcc_proc_init");
@@ -748,8 +782,8 @@ static int acpi_pcc_proc_init(struct acpi_device *device)
 	acpi_pcc_dir->owner = THIS_MODULE;
 	hotkey->proc_dir_entry = acpi_pcc_dir;
 
-	status =  acpi_pcc_add_device(device, pcc_proc_items_sifr, hotkey->num_sifr);
-	status |= acpi_pcc_add_device(device, pcc_proc_items, sizeof(pcc_proc_items)/sizeof(ProcItem));
+	status =  acpi_pcc_add_device(device, acpi_pcc_proc_items_sifr, hotkey->num_sifr);
+	status |= acpi_pcc_add_device(device, acpi_pcc_proc_items,      ARRAY_SIZE(acpi_pcc_proc_items));
 	if (unlikely(status)) {
 		remove_proc_entry(PROC_PCC, acpi_root_dir);
 		hotkey->proc_dir_entry = NULL;
@@ -759,9 +793,9 @@ static int acpi_pcc_proc_init(struct acpi_device *device)
 	return_VALUE(status);
 }
 
-static void acpi_pcc_remove_device(struct acpi_device *device,
-                                          ProcItem *proc_items,
-                                          int num)
+static void __devexit acpi_pcc_remove_device(struct acpi_device *device,
+					     ProcItem *proc_items,
+					     int num)
 {
 	struct acpi_hotkey *hotkey = (struct acpi_hotkey*)acpi_driver_data(device);
 	ProcItem* item;
@@ -771,131 +805,165 @@ static void acpi_pcc_remove_device(struct acpi_device *device,
 		remove_proc_entry(item->name, hotkey->proc_dir_entry);
 	}
 
-	return;
+	return_VOID;
+}
+
+/* *************************************************************************
+   Power Management
+   ************************************************************************* */
+#ifdef CONFIG_PM
+static int acpi_pcc_hotkey_resume(struct acpi_device *device)
+{
+	struct acpi_hotkey *hotkey = acpi_driver_data(device);
+	acpi_status	    status = AE_OK;
+
+	ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_resume");
+
+	if (device == NULL || hotkey == NULL) { return_VALUE(-EINVAL); }
+
+	if (hotkey->num_sifr != 0) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Sticky mode restore: %d\n", hotkey->sticky_mode));
+
+		status = acpi_pcc_write_sset(hotkey, SINF_STICKY_KEY, hotkey->sticky_mode);
+	}
+	if (status != AE_OK) { return_VALUE(-EINVAL); }
+
+	return_VALUE(0);
 }
+#endif
 
-/* --------------------------------------------------------------------------
-                             input init
-   -------------------------------------------------------------------------- */
-static int acpi_pcc_init_input(struct acpi_hotkey *hotkey)
+/* *************************************************************************
+   Module init/remove
+   ************************************************************************* */
+/* -------------------------------------------------------------------------
+   input
+   ------------------------------------------------------------------------- */
+static int __devinit acpi_pcc_init_input(struct acpi_hotkey *hotkey)
 {
-	struct input_dev *hotk_input_dev;
+	struct input_dev    *hotk_input_dev;
 	struct pcc_keyinput *pcc_keyinput;
+	int error;
 
 	ACPI_FUNCTION_TRACE("acpi_pcc_init_input");
 
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15)
 	hotk_input_dev = input_allocate_device();
-	if (!hotk_input_dev) {
-		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Couldn't allocate input device for hotkey"));
-		return_VALUE(-ENOMEM);
-	}
-#else
-	hotk_input_dev = kcalloc(1, sizeof(struct input_dev),GFP_KERNEL);
 	if (hotk_input_dev == NULL) {
-		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Couldn't allocate mem for hotkey"));
-		return_VALUE(-ENOMEM);
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Couldn't allocate input device for hotkey"));
+		goto err_input;
 	}
-#endif
 
-	pcc_keyinput = kcalloc(1,sizeof(struct pcc_keyinput),GFP_KERNEL);
+	pcc_keyinput = kcalloc(1, sizeof(struct pcc_keyinput), GFP_KERNEL);
 
 	if (pcc_keyinput == NULL) {
-		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Couldn't allocate mem for hotkey"));
-		input_unregister_device(hotk_input_dev);
-		return_VALUE(-ENOMEM);
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Couldn't allocate mem for private data"));
+		goto err_pcc;
 	}
 
 	hotk_input_dev->evbit[0] = BIT(EV_KEY);
 
 	set_bit(KEY_BRIGHTNESSDOWN, hotk_input_dev->keybit);
-	set_bit(KEY_BRIGHTNESSUP, hotk_input_dev->keybit);
-	set_bit(KEY_MUTE, hotk_input_dev->keybit);
-	set_bit(KEY_VOLUMEDOWN, hotk_input_dev->keybit);
-	set_bit(KEY_VOLUMEUP, hotk_input_dev->keybit);
-	set_bit(KEY_SLEEP, hotk_input_dev->keybit);
-	set_bit(KEY_BATT, hotk_input_dev->keybit);
-	set_bit(KEY_SUSPEND, hotk_input_dev->keybit);
-
-	hotk_input_dev->name = ACPI_PCC_DRIVER_NAME;
-	hotk_input_dev->phys = ACPI_PCC_INPUT_PHYS;
-	hotk_input_dev->id.bustype = 0x1a; /* XXX FIXME: BUS_I8042? */
-	hotk_input_dev->id.vendor = 0x0001;
+	set_bit(KEY_BRIGHTNESSUP,   hotk_input_dev->keybit);
+	set_bit(KEY_MUTE,	    hotk_input_dev->keybit);
+	set_bit(KEY_VOLUMEDOWN,	    hotk_input_dev->keybit);
+	set_bit(KEY_VOLUMEUP,	    hotk_input_dev->keybit);
+	set_bit(KEY_SLEEP,	    hotk_input_dev->keybit);
+	set_bit(KEY_BATT,	    hotk_input_dev->keybit);
+	set_bit(KEY_SUSPEND,	    hotk_input_dev->keybit);
+
+	hotk_input_dev->name       = ACPI_PCC_DRIVER_NAME;
+	hotk_input_dev->phys       = ACPI_PCC_INPUT_PHYS;
+	hotk_input_dev->id.bustype = BUS_PCC_HOTKEY;
+	hotk_input_dev->id.vendor  = 0x0001;
 	hotk_input_dev->id.product = 0x0001;
 	hotk_input_dev->id.version = 0x0100;
 
-	pcc_keyinput->key_mode = 1; /* default on */
-	pcc_keyinput->hotkey = hotkey;
+	pcc_keyinput->key_mode = PCC_KEYINPUT_MODE;
+	pcc_keyinput->hotkey   = hotkey;
 
 	input_set_drvdata(hotk_input_dev, pcc_keyinput);
 
 	hotkey->input_dev = hotk_input_dev;
 
+	error = input_register_device(hotk_input_dev);
 
-	input_register_device(hotk_input_dev);
+	if (error) {
+		goto err_pcc;
+	}
 
 	return_VALUE(0);
-}
 
-/* --------------------------------------------------------------------------
-                         module init
-   -------------------------------------------------------------------------- */
+ err_pcc:
+	input_unregister_device(hotk_input_dev);
+ err_input:
+	return_VALUE(-ENOMEM);
+}
 
-static int acpi_pcc_hotkey_resume(struct acpi_device *device)
+static void __devexit acpi_pcc_remove_input(struct acpi_hotkey *hotkey)
 {
-	struct acpi_hotkey *hotkey = acpi_driver_data(device);
-	acpi_status	    status = AE_OK;
+	struct input_dev    *hotk_input_dev;
+	struct pcc_keyinput *pcc_keyinput;
 
-	ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_resume");
+	ACPI_FUNCTION_TRACE("acpi_pcc_remove_input");
 
-	if (device == NULL || hotkey == NULL) { return_VALUE(-EINVAL); }
+	if (hotkey == NULL) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Can't free memory"));
+		return_VOID;
+	}
 
-	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n", hotkey->sticky_mode));
+	hotk_input_dev = hotkey->input_dev;
+	pcc_keyinput   = input_get_drvdata(hotk_input_dev);
 
-	status = acpi_pcc_write_sset(hotkey, SINF_STICKY_KEY, hotkey->sticky_mode);
+	input_unregister_device(hotk_input_dev);
 
-	return_VALUE(status == AE_OK ? 0 : -EINVAL);
+	kfree(pcc_keyinput);
 }
 
-static int acpi_pcc_hotkey_add (struct acpi_device *device)
+/* -------------------------------------------------------------------------
+   ACPI
+   ------------------------------------------------------------------------- */
+static int __devinit acpi_pcc_hotkey_add (struct acpi_device *device)
 {
 	acpi_status		status = AE_OK;
 	struct acpi_hotkey	*hotkey = NULL;
-	int num_sifr, result;
+	int sifr_status, num_sifr, result;
 
 	ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_add");
 
-	if (!device) {
+	if (device == NULL) {
 		return_VALUE(-EINVAL);
 	}
 
-	num_sifr = acpi_pcc_get_sqty(device);
+	sifr_status = acpi_pcc_get_sqty(device);
 
-	if (num_sifr > 255) {
+	if (sifr_status > 255) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr too large"));
 		return_VALUE(-ENODEV);
 	}
 
-	hotkey = kmalloc(sizeof(struct acpi_hotkey), GFP_KERNEL);
-	if (!hotkey) {
+	if (sifr_status < 0) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "not support SQTY"));
+		num_sifr = 0;
+	} else {
+		num_sifr = sifr_status;
+	}
+
+	hotkey = kcalloc(1, sizeof(struct acpi_hotkey), GFP_KERNEL);
+	if (hotkey == NULL) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Couldn't allocate mem for hotkey"));
 		return_VALUE(-ENOMEM);
 	}
 
-	memset(hotkey, 0, sizeof(struct acpi_hotkey));
-
-	hotkey->device = device;
-	hotkey->handle = device->handle;
+	hotkey->device   = device;
+	hotkey->handle   = device->handle;
 	hotkey->num_sifr = num_sifr;
 	acpi_driver_data(device) = hotkey;
-	strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
+	strcpy(acpi_device_name(device),  ACPI_PCC_DEVICE_NAME);
 	strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
 
-	status = acpi_install_notify_handler (
-			hotkey->handle,
-			ACPI_DEVICE_NOTIFY,
-			acpi_pcc_hotkey_notify,
-			hotkey);
+	status = acpi_install_notify_handler(hotkey->handle,
+					     ACPI_DEVICE_NOTIFY,
+					     acpi_pcc_hotkey_notify,
+					     hotkey);
 
 	if (ACPI_FAILURE(status)) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error installing notify handler\n"));
@@ -904,7 +972,7 @@ static int acpi_pcc_hotkey_add (struct acpi_device *device)
 	}
 
 	result = acpi_pcc_init_input(hotkey);
-	if (result) {
+	if (result != 0) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error installing keyinput handler\n"));
 		kfree(hotkey);
 		return_VALUE(result);
@@ -913,62 +981,72 @@ static int acpi_pcc_hotkey_add (struct acpi_device *device)
 	return_VALUE(acpi_pcc_proc_init(device));
 }
 
-static int __init acpi_pcc_init(void)
-{
-	int result = 0;
-
-	ACPI_FUNCTION_TRACE("acpi_pcc_init");
-
-	if (acpi_disabled) {
-		return_VALUE(-ENODEV);
-	}
-
-	result = acpi_bus_register_driver(&acpi_pcc_driver);
-	if (result < 0) {
-		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error registering hotkey driver\n"));
-		return_VALUE(-ENODEV);
-	}
-
-	return_VALUE(0);
-}
-
-module_init(acpi_pcc_init);
-
-static int acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
+static int __devexit acpi_pcc_hotkey_remove(struct acpi_device *device, int type)
 {
 	acpi_status		status = AE_OK;
 	struct acpi_hotkey	*hotkey = acpi_driver_data(device);
 
 	ACPI_FUNCTION_TRACE("acpi_pcc_hotkey_remove");
 
-	if (!device || !hotkey)
+	if (!device || !hotkey) {
 		return_VALUE(-EINVAL);
+	}
 
 	if (hotkey->proc_dir_entry) {
-		acpi_pcc_remove_device(device, pcc_proc_items_sifr, hotkey->num_sifr);
-		acpi_pcc_remove_device(device, pcc_proc_items, sizeof(pcc_proc_items)/sizeof(ProcItem));
+		acpi_pcc_remove_device(device, acpi_pcc_proc_items_sifr, hotkey->num_sifr);
+		acpi_pcc_remove_device(device, acpi_pcc_proc_items,      ARRAY_SIZE(acpi_pcc_proc_items));
 		remove_proc_entry(PROC_PCC, acpi_root_dir);
 	}
 
 	status = acpi_remove_notify_handler(hotkey->handle,
 		    ACPI_DEVICE_NOTIFY, acpi_pcc_hotkey_notify);
 
-	if (ACPI_FAILURE(status))
+	if (ACPI_FAILURE(status)) {
 		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error removing notify handler\n"));
+	}
 
-	input_unregister_device(hotkey->input_dev);
-
-	kfree(hotkey);
+	acpi_pcc_remove_input(hotkey);
+	if (hotkey != NULL) {
+		kfree(hotkey);
+	}
 	return_VALUE(status == AE_OK);
 }
 
+/* *********************************************************************
+   Module entry point
+   ********************************************************************* */
+static int __init acpi_pcc_init(void)
+{
+	int result;
+
+	ACPI_FUNCTION_TRACE("acpi_pcc_init");
+
+	printk(KERN_INFO LOGPREFIX "loading...\n");
+
+	if (acpi_disabled) {
+		printk(KERN_INFO LOGPREFIX "ACPI disabled.\n");
+		return_VALUE(-ENODEV);
+	}
+
+	result = acpi_bus_register_driver(&acpi_pcc_driver);
+	if (result < 0) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error registering hotkey driver\n"));
+		return_VALUE(-ENODEV);
+	}
+
+	return_VALUE(result);
+}
+
 static void __exit acpi_pcc_exit(void)
 {
 	ACPI_FUNCTION_TRACE("acpi_pcc_exit");
 
+	printk(KERN_INFO LOGPREFIX "unloading...\n");
+
 	acpi_bus_unregister_driver(&acpi_pcc_driver);
 
 	return_VOID;
 }
 
+module_init(acpi_pcc_init);
 module_exit(acpi_pcc_exit);