[deliverable/linux.git] / drivers / platform / x86 / panasonic-laptop.c

/*
 *  Panasonic HotKey and LCD brightness control driver
 *  (C) 2004 Hiroshi Miura <miura@da-cha.org>
 *  (C) 2004 NTT DATA Intellilink Co. http://www.intellilink.co.jp/
 *  (C) YOKOTA Hiroshi <yokota (at) netlab. is. tsukuba. ac. jp>
 *  (C) 2004 David Bronaugh <dbronaugh>
 *  (C) 2006-2008 Harald Welte <laforge@gnumonks.org>
 *
 *  derived from toshiba_acpi.c, Copyright (C) 2002-2004 John Belmonte
 *
 *  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
 *  publicshed by the Free Software Foundation.
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 *
 *---------------------------------------------------------------------------
 *
 * ChangeLog:
 *	Sep.23, 2008	Harald Welte <laforge@gnumonks.org>
 *		-v0.95	rename driver from drivers/acpi/pcc_acpi.c to
 *			drivers/misc/panasonic-laptop.c
 *
 * 	Jul.04, 2008	Harald Welte <laforge@gnumonks.org>
 * 		-v0.94	replace /proc interface with device attributes
 * 			support {set,get}keycode on th input device
 *
 *      Jun.27, 2008	Harald Welte <laforge@gnumonks.org>
 *      	-v0.92	merge with 2.6.26-rc6 input API changes
 *      		remove broken <= 2.6.15 kernel support
 *      		resolve all compiler warnings
 *      		various coding style fixes (checkpatch.pl)
 *      		add support for backlight api
 *      		major code restructuring
 *
 * 	Dac.28, 2007	Harald Welte <laforge@gnumonks.org>
 * 		-v0.91	merge with 2.6.24-rc6 ACPI changes
 *
 * 	Nov.04, 2006	Hiroshi Miura <miura@da-cha.org>
 * 		-v0.9	remove warning about section reference.
 * 			remove acpi_os_free
 * 			add /proc/acpi/pcc/brightness interface for HAL access
 * 			merge dbronaugh's enhancement
 * 			Aug.17, 2004 David Bronaugh (dbronaugh)
 *  				- Added screen brightness setting interface
 *				  Thanks to FreeBSD crew (acpi_panasonic.c)
 * 				  for the ideas I needed to accomplish it
 *
 *	May.29, 2006	Hiroshi Miura <miura@da-cha.org>
 *		-v0.8.4 follow to change keyinput structure
 *			thanks Fabian Yamaguchi <fabs@cs.tu-berlin.de>,
 *			Jacob Bower <jacob.bower@ic.ac.uk> and
 *			Hiroshi Yokota for providing solutions.
 *
 *	Oct.02, 2004	Hiroshi Miura <miura@da-cha.org>
 *		-v0.8.2	merge code of YOKOTA Hiroshi
 *					<yokota@netlab.is.tsukuba.ac.jp>.
 *			Add sticky key mode interface.
 *			Refactoring acpi_pcc_generate_keyinput().
 *
 *	Sep.15, 2004	Hiroshi Miura <miura@da-cha.org>
 *		-v0.8	Generate key input event on input subsystem.
 *			This is based on yet another driver written by
 *							Ryuta Nakanishi.
 *
 *	Sep.10, 2004	Hiroshi Miura <miura@da-cha.org>
 *		-v0.7	Change proc interface functions using seq_file
 *			facility as same as other ACPI drivers.
 *
 *	Aug.28, 2004	Hiroshi Miura <miura@da-cha.org>
 *		-v0.6.4 Fix a silly error with status checking
 *
 *	Aug.25, 2004	Hiroshi Miura <miura@da-cha.org>
 *		-v0.6.3 replace read_acpi_int by standard function
 *							acpi_evaluate_integer
 *			some clean up and make smart copyright notice.
 *			fix return value of pcc_acpi_get_key()
 *			fix checking return value of acpi_bus_register_driver()
 *
 *      Aug.22, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
 *              -v0.6.2 Add check on ACPI data (num_sifr)
 *                      Coding style cleanups, better error messages/handling
 *			Fixed an off-by-one error in memory allocation
 *
 *      Aug.21, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
 *              -v0.6.1 Fix a silly error with status checking
 *
 *      Aug.20, 2004    David Bronaugh <dbronaugh@linuxboxen.org>
 *              - v0.6  Correct brightness controls to reflect reality
 *                      based on information gleaned by Hiroshi Miura
 *                      and discussions with Hiroshi Miura
 *
 *	Aug.10, 2004	Hiroshi Miura <miura@da-cha.org>
 *		- v0.5  support LCD brightness control
 *			based on the disclosed information by MEI.
 *
 *	Jul.25, 2004	Hiroshi Miura <miura@da-cha.org>
 *		- v0.4  first post version
 *		        add function to retrive SIFR
 *
 *	Jul.24, 2004	Hiroshi Miura <miura@da-cha.org>
 *		- v0.3  get proper status of hotkey
 *
 *      Jul.22, 2004	Hiroshi Miura <miura@da-cha.org>
 *		- v0.2  add HotKey handler
 *
 *      Jul.17, 2004	Hiroshi Miura <miura@da-cha.org>
 *		- v0.1  start from toshiba_acpi driver written by John Belmonte
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/backlight.h>
#include <linux/ctype.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>


#ifndef ACPI_HOTKEY_COMPONENT
#define ACPI_HOTKEY_COMPONENT	0x10000000
#endif

#define _COMPONENT		ACPI_HOTKEY_COMPONENT

MODULE_AUTHOR("Hiroshi Miura, David Bronaugh and Harald Welte");
MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops");
MODULE_LICENSE("GPL");

#define LOGPREFIX "pcc_acpi: "

/* Define ACPI PATHs */
/* Lets note hotkeys */
#define METHOD_HKEY_QUERY	"HINF"
#define METHOD_HKEY_SQTY	"SQTY"
#define METHOD_HKEY_SINF	"SINF"
#define METHOD_HKEY_SSET	"SSET"
#define HKEY_NOTIFY		 0x80

#define ACPI_PCC_DRIVER_NAME	"Panasonic Laptop Support"
#define ACPI_PCC_DEVICE_NAME	"Hotkey"
#define ACPI_PCC_CLASS		"pcc"

#define ACPI_PCC_INPUT_PHYS	"panasonic/hkey0"

/* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent
   ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00
*/
enum SINF_BITS { SINF_NUM_BATTERIES = 0,
		 SINF_LCD_TYPE,
		 SINF_AC_MAX_BRIGHT,
		 SINF_AC_MIN_BRIGHT,
		 SINF_AC_CUR_BRIGHT,
		 SINF_DC_MAX_BRIGHT,
		 SINF_DC_MIN_BRIGHT,
		 SINF_DC_CUR_BRIGHT,
		 SINF_MUTE,
		 SINF_RESERVED,
		 SINF_ENV_STATE,
		 SINF_STICKY_KEY = 0x80,
	};
/* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */

static int acpi_pcc_hotkey_add(struct acpi_device *device);
static int acpi_pcc_hotkey_remove(struct acpi_device *device);
static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event);

static const struct acpi_device_id pcc_device_ids[] = {
	{ "MAT0012", 0},
	{ "MAT0013", 0},
	{ "MAT0018", 0},
	{ "MAT0019", 0},
	{ "", 0},
};
MODULE_DEVICE_TABLE(acpi, pcc_device_ids);

#ifdef CONFIG_PM_SLEEP
static int acpi_pcc_hotkey_resume(struct device *dev);
#endif
static SIMPLE_DEV_PM_OPS(acpi_pcc_hotkey_pm, NULL, acpi_pcc_hotkey_resume);

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,
				.notify =	acpi_pcc_hotkey_notify,
			},
	.drv.pm =	&acpi_pcc_hotkey_pm,
};

static const struct key_entry panasonic_keymap[] = {
	{ KE_KEY, 0, { KEY_RESERVED } },
	{ KE_KEY, 1, { KEY_BRIGHTNESSDOWN } },
	{ KE_KEY, 2, { KEY_BRIGHTNESSUP } },
	{ KE_KEY, 3, { KEY_DISPLAYTOGGLE } },
	{ KE_KEY, 4, { KEY_MUTE } },
	{ KE_KEY, 5, { KEY_VOLUMEDOWN } },
	{ KE_KEY, 6, { KEY_VOLUMEUP } },
	{ KE_KEY, 7, { KEY_SLEEP } },
	{ KE_KEY, 8, { KEY_PROG1 } }, /* Change CPU boost */
	{ KE_KEY, 9, { KEY_BATTERY } },
	{ KE_KEY, 10, { KEY_SUSPEND } },
	{ KE_END, 0 }
};

struct pcc_acpi {
	acpi_handle		handle;
	unsigned long		num_sifr;
	int			sticky_mode;
	u32			*sinf;
	struct acpi_device	*device;
	struct input_dev	*input_dev;
	struct backlight_device	*backlight;
};

struct pcc_keyinput {
	struct acpi_hotkey      *hotkey;
};

/* method access functions */
static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
{
	union acpi_object in_objs[] = {
		{ .integer.type  = ACPI_TYPE_INTEGER,
		  .integer.value = func, },
		{ .integer.type  = ACPI_TYPE_INTEGER,
		  .integer.value = val, },
	};
	struct acpi_object_list params = {
		.count   = ARRAY_SIZE(in_objs),
		.pointer = in_objs,
	};
	acpi_status status = AE_OK;

	status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
				      &params, NULL);

	return (status == AE_OK) ? 0 : -EIO;
}

static inline int acpi_pcc_get_sqty(struct acpi_device *device)
{
	unsigned long long s;
	acpi_status status;

	status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
				       NULL, &s);
	if (ACPI_SUCCESS(status))
		return s;
	else {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "evaluation error HKEY.SQTY\n"));
		return -EINVAL;
	}
}

static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc)
{
	acpi_status status;
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	union acpi_object *hkey = NULL;
	int i;

	status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL,
				      &buffer);
	if (ACPI_FAILURE(status)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "evaluation error HKEY.SINF\n"));
		return 0;
	}

	hkey = buffer.pointer;
	if (!hkey || (hkey->type != ACPI_TYPE_PACKAGE)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
		status = AE_ERROR;
		goto end;
	}

	if (pcc->num_sifr < hkey->package.count) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				 "SQTY reports bad SINF length\n"));
		status = AE_ERROR;
		goto end;
	}

	for (i = 0; i < hkey->package.count; i++) {
		union acpi_object *element = &(hkey->package.elements[i]);
		if (likely(element->type == ACPI_TYPE_INTEGER)) {
			pcc->sinf[i] = element->integer.value;
		} else
			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
					 "Invalid HKEY.SINF data\n"));
	}
	pcc->sinf[hkey->package.count] = -1;

end:
	kfree(buffer.pointer);
	return status == AE_OK;
}

/* backlight API interface functions */

/* This driver currently treats AC and DC brightness identical,
 * since we don't need to invent an interface to the core ACPI
 * logic to receive events in case a power supply is plugged in
 * or removed */

static int bl_get(struct backlight_device *bd)
{
	struct pcc_acpi *pcc = bl_get_data(bd);

	if (!acpi_pcc_retrieve_biosdata(pcc))
		return -EIO;

	return pcc->sinf[SINF_AC_CUR_BRIGHT];
}

static int bl_set_status(struct backlight_device *bd)
{
	struct pcc_acpi *pcc = bl_get_data(bd);
	int bright = bd->props.brightness;
	int rc;

	if (!acpi_pcc_retrieve_biosdata(pcc))
		return -EIO;

	if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
		bright = pcc->sinf[SINF_AC_MIN_BRIGHT];

	if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
		bright = pcc->sinf[SINF_DC_MIN_BRIGHT];

	if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] ||
	    bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
		return -EINVAL;

	rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
	if (rc < 0)
		return rc;

	return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
}

static const struct backlight_ops pcc_backlight_ops = {
	.get_brightness	= bl_get,
	.update_status	= bl_set_status,
};


/* sysfs user interface functions */

static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
			    char *buf)
{
	struct acpi_device *acpi = to_acpi_device(dev);
	struct pcc_acpi *pcc = acpi_driver_data(acpi);

	if (!acpi_pcc_retrieve_biosdata(pcc))
		return -EIO;

	return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
}

static ssize_t show_lcdtype(struct device *dev, struct device_attribute *attr,
			    char *buf)
{
	struct acpi_device *acpi = to_acpi_device(dev);
	struct pcc_acpi *pcc = acpi_driver_data(acpi);

	if (!acpi_pcc_retrieve_biosdata(pcc))
		return -EIO;

	return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
}

static ssize_t show_mute(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct acpi_device *acpi = to_acpi_device(dev);
	struct pcc_acpi *pcc = acpi_driver_data(acpi);

	if (!acpi_pcc_retrieve_biosdata(pcc))
		return -EIO;

	return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]);
}

static ssize_t show_sticky(struct device *dev, struct device_attribute *attr,
			   char *buf)
{
	struct acpi_device *acpi = to_acpi_device(dev);
	struct pcc_acpi *pcc = acpi_driver_data(acpi);

	if (!acpi_pcc_retrieve_biosdata(pcc))
		return -EIO;

	return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
}

static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct acpi_device *acpi = to_acpi_device(dev);
	struct pcc_acpi *pcc = acpi_driver_data(acpi);
	int val;

	if (count && sscanf(buf, "%i", &val) == 1 &&
	    (val == 0 || val == 1)) {
		acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
		pcc->sticky_mode = val;
	}

	return count;
}

static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);

static struct attribute *pcc_sysfs_entries[] = {
	&dev_attr_numbatt.attr,
	&dev_attr_lcdtype.attr,
	&dev_attr_mute.attr,
	&dev_attr_sticky_key.attr,
	NULL,
};

static struct attribute_group pcc_attr_group = {
	.name	= NULL,		/* put in device directory */
	.attrs	= pcc_sysfs_entries,
};


/* hotkey input device driver */

static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
{
	struct input_dev *hotk_input_dev = pcc->input_dev;
	int rc;
	unsigned long long result;

	rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
				   NULL, &result);
	if (!ACPI_SUCCESS(rc)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				 "error getting hotkey status\n"));
		return;
	}
	if (!sparse_keymap_report_event(hotk_input_dev,
					result & 0xf, result & 0x80, false))
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Unknown hotkey event: %d\n", result));
}

static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
{
	struct pcc_acpi *pcc = acpi_driver_data(device);

	switch (event) {
	case HKEY_NOTIFY:
		acpi_pcc_generate_keyinput(pcc);
		break;
	default:
		/* nothing to do */
		break;
	}
}

static int acpi_pcc_init_input(struct pcc_acpi *pcc)
{
	struct input_dev *input_dev;
	int error;

	input_dev = input_allocate_device();
	if (!input_dev)
		return -ENOMEM;

	input_dev->name = ACPI_PCC_DRIVER_NAME;
	input_dev->phys = ACPI_PCC_INPUT_PHYS;
	input_dev->id.bustype = BUS_HOST;
	input_dev->id.vendor = 0x0001;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0100;

	error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL);
	if (error) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Unable to setup input device keymap\n"));
		goto err_free_dev;
	}

	error = input_register_device(input_dev);
	if (error) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Unable to register input device\n"));
		goto err_free_keymap;
	}

	pcc->input_dev = input_dev;
	return 0;

 err_free_keymap:
	sparse_keymap_free(input_dev);
 err_free_dev:
	input_free_device(input_dev);
	return error;
}

static void acpi_pcc_destroy_input(struct pcc_acpi *pcc)
{
	sparse_keymap_free(pcc->input_dev);
	input_unregister_device(pcc->input_dev);
	/*
	 * No need to input_free_device() since core input API refcounts
	 * and free()s the device.
	 */
}

/* kernel module interface */

#ifdef CONFIG_PM_SLEEP
static int acpi_pcc_hotkey_resume(struct device *dev)
{
	struct pcc_acpi *pcc;

	if (!dev)
		return -EINVAL;

	pcc = acpi_driver_data(to_acpi_device(dev));
	if (!pcc)
		return -EINVAL;

	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
			  pcc->sticky_mode));

	return acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
}
#endif

static int acpi_pcc_hotkey_add(struct acpi_device *device)
{
	struct backlight_properties props;
	struct pcc_acpi *pcc;
	int num_sifr, result;

	if (!device)
		return -EINVAL;

	num_sifr = acpi_pcc_get_sqty(device);

	if (num_sifr < 0 || num_sifr > 255) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr out of range"));
		return -ENODEV;
	}

	pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
	if (!pcc) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Couldn't allocate mem for pcc"));
		return -ENOMEM;
	}

	pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
	if (!pcc->sinf) {
		result = -ENOMEM;
		goto out_hotkey;
	}

	pcc->device = device;
	pcc->handle = device->handle;
	pcc->num_sifr = num_sifr;
	device->driver_data = pcc;
	strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
	strcpy(acpi_device_class(device), ACPI_PCC_CLASS);

	result = acpi_pcc_init_input(pcc);
	if (result) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				  "Error installing keyinput handler\n"));
		goto out_sinf;
	}

	if (!acpi_pcc_retrieve_biosdata(pcc)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				 "Couldn't retrieve BIOS data\n"));
		result = -EIO;
		goto out_input;
	}
	/* initialize backlight */
	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_PLATFORM;
	props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
	pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
						   &pcc_backlight_ops, &props);
	if (IS_ERR(pcc->backlight)) {
		result = PTR_ERR(pcc->backlight);
		goto out_input;
	}

	/* read the initial brightness setting from the hardware */
	pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];

	/* read the initial sticky key mode from the hardware */
	pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];

	/* add sysfs attributes */
	result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
	if (result)
		goto out_backlight;

	return 0;

out_backlight:
	backlight_device_unregister(pcc->backlight);
out_input:
	acpi_pcc_destroy_input(pcc);
out_sinf:
	kfree(pcc->sinf);
out_hotkey:
	kfree(pcc);

	return result;
}

static int acpi_pcc_hotkey_remove(struct acpi_device *device)
{
	struct pcc_acpi *pcc = acpi_driver_data(device);

	if (!device || !pcc)
		return -EINVAL;

	sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);

	backlight_device_unregister(pcc->backlight);

	acpi_pcc_destroy_input(pcc);

	kfree(pcc->sinf);
	kfree(pcc);

	return 0;
}

module_acpi_driver(acpi_pcc_driver);
Commit	Line	Data
709ee531 HW	1	/*
	2	* Panasonic HotKey and LCD brightness control driver
	3	* (C) 2004 Hiroshi Miura <miura@da-cha.org>
	4	* (C) 2004 NTT DATA Intellilink Co. http://www.intellilink.co.jp/
	5	* (C) YOKOTA Hiroshi <yokota (at) netlab. is. tsukuba. ac. jp>
	6	* (C) 2004 David Bronaugh <dbronaugh>
	7	* (C) 2006-2008 Harald Welte <laforge@gnumonks.org>
	8	*
	9	* derived from toshiba_acpi.c, Copyright (C) 2002-2004 John Belmonte
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License version 2 as
	13	* publicshed by the Free Software Foundation.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	23	*
	24	*---------------------------------------------------------------------------
	25	*
	26	* ChangeLog:
	27	* Sep.23, 2008 Harald Welte <laforge@gnumonks.org>
	28	* -v0.95 rename driver from drivers/acpi/pcc_acpi.c to
	29	* drivers/misc/panasonic-laptop.c
	30	*
	31	* Jul.04, 2008 Harald Welte <laforge@gnumonks.org>
	32	* -v0.94 replace /proc interface with device attributes
	33	* support {set,get}keycode on th input device
	34	*
	35	* Jun.27, 2008 Harald Welte <laforge@gnumonks.org>
	36	* -v0.92 merge with 2.6.26-rc6 input API changes
	37	* remove broken <= 2.6.15 kernel support
	38	* resolve all compiler warnings
	39	* various coding style fixes (checkpatch.pl)
	40	* add support for backlight api
	41	* major code restructuring
	42	*
	43	* Dac.28, 2007 Harald Welte <laforge@gnumonks.org>
	44	* -v0.91 merge with 2.6.24-rc6 ACPI changes
	45	*
	46	* Nov.04, 2006 Hiroshi Miura <miura@da-cha.org>
	47	* -v0.9 remove warning about section reference.
	48	* remove acpi_os_free
	49	* add /proc/acpi/pcc/brightness interface for HAL access
	50	* merge dbronaugh's enhancement
	51	* Aug.17, 2004 David Bronaugh (dbronaugh)
	52	* - Added screen brightness setting interface
	53	* Thanks to FreeBSD crew (acpi_panasonic.c)
	54	* for the ideas I needed to accomplish it
	55	*
	56	* May.29, 2006 Hiroshi Miura <miura@da-cha.org>
	57	* -v0.8.4 follow to change keyinput structure
	58	* thanks Fabian Yamaguchi <fabs@cs.tu-berlin.de>,
	59	* Jacob Bower <jacob.bower@ic.ac.uk> and
	60	* Hiroshi Yokota for providing solutions.
	61	*
	62	* Oct.02, 2004 Hiroshi Miura <miura@da-cha.org>
	63	* -v0.8.2 merge code of YOKOTA Hiroshi
	64	* <yokota@netlab.is.tsukuba.ac.jp>.
65	* Add sticky key mode interface.
66	* Refactoring acpi_pcc_generate_keyinput().
67	*
68	* Sep.15, 2004 Hiroshi Miura <miura@da-cha.org>
69	* -v0.8 Generate key input event on input subsystem.
70	* This is based on yet another driver written by
71	* Ryuta Nakanishi.
72	*
73	* Sep.10, 2004 Hiroshi Miura <miura@da-cha.org>
74	* -v0.7 Change proc interface functions using seq_file
75	* facility as same as other ACPI drivers.
76	*
77	* Aug.28, 2004 Hiroshi Miura <miura@da-cha.org>
78	* -v0.6.4 Fix a silly error with status checking
79	*
80	* Aug.25, 2004 Hiroshi Miura <miura@da-cha.org>
81	* -v0.6.3 replace read_acpi_int by standard function
82	* acpi_evaluate_integer
83	* some clean up and make smart copyright notice.
84	* fix return value of pcc_acpi_get_key()
85	* fix checking return value of acpi_bus_register_driver()
86	*
87	* Aug.22, 2004 David Bronaugh <dbronaugh@linuxboxen.org>
88	* -v0.6.2 Add check on ACPI data (num_sifr)
89	* Coding style cleanups, better error messages/handling
90	* Fixed an off-by-one error in memory allocation
91	*
92	* Aug.21, 2004 David Bronaugh <dbronaugh@linuxboxen.org>
93	* -v0.6.1 Fix a silly error with status checking
94	*
95	* Aug.20, 2004 David Bronaugh <dbronaugh@linuxboxen.org>
96	* - v0.6 Correct brightness controls to reflect reality
97	* based on information gleaned by Hiroshi Miura
98	* and discussions with Hiroshi Miura
99	*
100	* Aug.10, 2004 Hiroshi Miura <miura@da-cha.org>
101	* - v0.5 support LCD brightness control
102	* based on the disclosed information by MEI.
103	*
104	* Jul.25, 2004 Hiroshi Miura <miura@da-cha.org>
105	* - v0.4 first post version
106	* add function to retrive SIFR
107	*
108	* Jul.24, 2004 Hiroshi Miura <miura@da-cha.org>
109	* - v0.3 get proper status of hotkey
110	*
111	* Jul.22, 2004 Hiroshi Miura <miura@da-cha.org>
112	* - v0.2 add HotKey handler
113	*
114	* Jul.17, 2004 Hiroshi Miura <miura@da-cha.org>
115	* - v0.1 start from toshiba_acpi driver written by John Belmonte
116	*
117	*/
118
709ee531 HW	119	#include <linux/kernel.h>
	120	#include <linux/module.h>
	121	#include <linux/init.h>
	122	#include <linux/types.h>
	123	#include <linux/backlight.h>
	124	#include <linux/ctype.h>
	125	#include <linux/seq_file.h>
	126	#include <linux/uaccess.h>
5a0e3ad6	127	#include <linux/slab.h>
709ee531 HW	128	#include <acpi/acpi_bus.h>
	129	#include <acpi/acpi_drivers.h>
	130	#include <linux/input.h>
1a765cac	131	#include <linux/input/sparse-keymap.h>
709ee531 HW	132
	133
	134	#ifndef ACPI_HOTKEY_COMPONENT
	135	#define ACPI_HOTKEY_COMPONENT 0x10000000
	136	#endif
	137
	138	#define _COMPONENT ACPI_HOTKEY_COMPONENT
	139
	140	MODULE_AUTHOR("Hiroshi Miura, David Bronaugh and Harald Welte");
	141	MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops");
	142	MODULE_LICENSE("GPL");
	143
	144	#define LOGPREFIX "pcc_acpi: "
	145
	146	/* Define ACPI PATHs */
	147	/* Lets note hotkeys */
	148	#define METHOD_HKEY_QUERY "HINF"
	149	#define METHOD_HKEY_SQTY "SQTY"
	150	#define METHOD_HKEY_SINF "SINF"
	151	#define METHOD_HKEY_SSET "SSET"
	152	#define HKEY_NOTIFY 0x80
	153
	154	#define ACPI_PCC_DRIVER_NAME "Panasonic Laptop Support"
	155	#define ACPI_PCC_DEVICE_NAME "Hotkey"
	156	#define ACPI_PCC_CLASS "pcc"
	157
	158	#define ACPI_PCC_INPUT_PHYS "panasonic/hkey0"
	159
	160	/* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent
	161	ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00
	162	*/
	163	enum SINF_BITS { SINF_NUM_BATTERIES = 0,
	164	SINF_LCD_TYPE,
	165	SINF_AC_MAX_BRIGHT,
	166	SINF_AC_MIN_BRIGHT,
	167	SINF_AC_CUR_BRIGHT,
	168	SINF_DC_MAX_BRIGHT,
	169	SINF_DC_MIN_BRIGHT,
	170	SINF_DC_CUR_BRIGHT,
	171	SINF_MUTE,
	172	SINF_RESERVED,
	173	SINF_ENV_STATE,
	174	SINF_STICKY_KEY = 0x80,
	175	};
	176	/* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */
	177
	178	static int acpi_pcc_hotkey_add(struct acpi_device *device);
51fac838	179	static int acpi_pcc_hotkey_remove(struct acpi_device *device);
cddd1f71	180	static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event);
709ee531 HW	181
	182	static const struct acpi_device_id pcc_device_ids[] = {
	183	{ "MAT0012", 0},
	184	{ "MAT0013", 0},
	185	{ "MAT0018", 0},
	186	{ "MAT0019", 0},
	187	{ "", 0},
	188	};
c542aade	189	MODULE_DEVICE_TABLE(acpi, pcc_device_ids);
709ee531	190
3567a4e2	191	#ifdef CONFIG_PM_SLEEP
a7377419	192	static int acpi_pcc_hotkey_resume(struct device *dev);
3567a4e2	193	#endif
a7377419 RW	194	static SIMPLE_DEV_PM_OPS(acpi_pcc_hotkey_pm, NULL, acpi_pcc_hotkey_resume);
a7377419 RW	195
709ee531 HW	196	static struct acpi_driver acpi_pcc_driver = {
	197	.name = ACPI_PCC_DRIVER_NAME,
	198	.class = ACPI_PCC_CLASS,
	199	.ids = pcc_device_ids,
	200	.ops = {
	201	.add = acpi_pcc_hotkey_add,
	202	.remove = acpi_pcc_hotkey_remove,
cddd1f71	203	.notify = acpi_pcc_hotkey_notify,
709ee531	204	},
a7377419	205	.drv.pm = &acpi_pcc_hotkey_pm,
709ee531 HW	206	};
709ee531 HW	207
1a765cac DT	208	static const struct key_entry panasonic_keymap[] = {
	209	{ KE_KEY, 0, { KEY_RESERVED } },
	210	{ KE_KEY, 1, { KEY_BRIGHTNESSDOWN } },
	211	{ KE_KEY, 2, { KEY_BRIGHTNESSUP } },
	212	{ KE_KEY, 3, { KEY_DISPLAYTOGGLE } },
	213	{ KE_KEY, 4, { KEY_MUTE } },
	214	{ KE_KEY, 5, { KEY_VOLUMEDOWN } },
	215	{ KE_KEY, 6, { KEY_VOLUMEUP } },
	216	{ KE_KEY, 7, { KEY_SLEEP } },
	217	{ KE_KEY, 8, { KEY_PROG1 } }, /* Change CPU boost */
	218	{ KE_KEY, 9, { KEY_BATTERY } },
	219	{ KE_KEY, 10, { KEY_SUSPEND } },
	220	{ KE_END, 0 }
709ee531 HW	221	};
	222
	223	struct pcc_acpi {
	224	acpi_handle handle;
	225	unsigned long num_sifr;
	226	int sticky_mode;
1a765cac	227	u32 *sinf;
709ee531 HW	228	struct acpi_device *device;
	229	struct input_dev *input_dev;
	230	struct backlight_device *backlight;
709ee531 HW	231	};
	232
	233	struct pcc_keyinput {
	234	struct acpi_hotkey *hotkey;
	235	};
	236
	237	/* method access functions */
	238	static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
	239	{
	240	union acpi_object in_objs[] = {
	241	{ .integer.type = ACPI_TYPE_INTEGER,
	242	.integer.value = func, },
	243	{ .integer.type = ACPI_TYPE_INTEGER,
	244	.integer.value = val, },
	245	};
	246	struct acpi_object_list params = {
	247	.count = ARRAY_SIZE(in_objs),
	248	.pointer = in_objs,
	249	};
	250	acpi_status status = AE_OK;
	251
709ee531 HW	252	status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
	253	&params, NULL);
	254
9fab10cd	255	return (status == AE_OK) ? 0 : -EIO;
709ee531 HW	256	}
	257
	258	static inline int acpi_pcc_get_sqty(struct acpi_device *device)
	259	{
3e2dab9a	260	unsigned long long s;
709ee531 HW	261	acpi_status status;
709ee531 HW	262
709ee531 HW	263	status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
	264	NULL, &s);
	265	if (ACPI_SUCCESS(status))
	266	return s;
	267	else {
	268	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	269	"evaluation error HKEY.SQTY\n"));
	270	return -EINVAL;
	271	}
	272	}
	273
e253fb94	274	static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc)
709ee531 HW	275	{
	276	acpi_status status;
	277	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	278	union acpi_object *hkey = NULL;
	279	int i;
	280
a3c27056	281	status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL,
709ee531 HW	282	&buffer);
	283	if (ACPI_FAILURE(status)) {
	284	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	285	"evaluation error HKEY.SINF\n"));
	286	return 0;
	287	}
	288
	289	hkey = buffer.pointer;
	290	if (!hkey \|\| (hkey->type != ACPI_TYPE_PACKAGE)) {
	291	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
aa13857f	292	status = AE_ERROR;
709ee531 HW	293	goto end;
	294	}
	295
	296	if (pcc->num_sifr < hkey->package.count) {
	297	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	298	"SQTY reports bad SINF length\n"));
	299	status = AE_ERROR;
	300	goto end;
	301	}
	302
	303	for (i = 0; i < hkey->package.count; i++) {
	304	union acpi_object *element = &(hkey->package.elements[i]);
	305	if (likely(element->type == ACPI_TYPE_INTEGER)) {
e253fb94	306	pcc->sinf[i] = element->integer.value;
709ee531 HW	307	} else
	308	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	309	"Invalid HKEY.SINF data\n"));
	310	}
e253fb94	311	pcc->sinf[hkey->package.count] = -1;
709ee531 HW	312
	313	end:
	314	kfree(buffer.pointer);
	315	return status == AE_OK;
	316	}
	317
	318	/* backlight API interface functions */
	319
	320	/* This driver currently treats AC and DC brightness identical,
	321	* since we don't need to invent an interface to the core ACPI
	322	* logic to receive events in case a power supply is plugged in
	323	* or removed */
	324
	325	static int bl_get(struct backlight_device *bd)
	326	{
	327	struct pcc_acpi *pcc = bl_get_data(bd);
	328
e253fb94	329	if (!acpi_pcc_retrieve_biosdata(pcc))
709ee531 HW	330	return -EIO;
	331
	332	return pcc->sinf[SINF_AC_CUR_BRIGHT];
	333	}
	334
	335	static int bl_set_status(struct backlight_device *bd)
	336	{
	337	struct pcc_acpi *pcc = bl_get_data(bd);
	338	int bright = bd->props.brightness;
	339	int rc;
	340
e253fb94	341	if (!acpi_pcc_retrieve_biosdata(pcc))
709ee531 HW	342	return -EIO;
	343
	344	if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
	345	bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
	346
	347	if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
	348	bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
	349
	350	if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] \|\|
	351	bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
	352	return -EINVAL;
	353
	354	rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
	355	if (rc < 0)
	356	return rc;
	357
	358	return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
	359	}
	360
ec57af9c	361	static const struct backlight_ops pcc_backlight_ops = {
709ee531 HW	362	.get_brightness = bl_get,
	363	.update_status = bl_set_status,
	364	};
	365
	366
	367	/* sysfs user interface functions */
	368
	369	static ssize_t show_numbatt(struct device dev, struct device_attribute attr,
	370	char *buf)
	371	{
	372	struct acpi_device *acpi = to_acpi_device(dev);
	373	struct pcc_acpi *pcc = acpi_driver_data(acpi);
	374
e253fb94	375	if (!acpi_pcc_retrieve_biosdata(pcc))
709ee531 HW	376	return -EIO;
709ee531 HW	377
ba256b41	378	return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
709ee531 HW	379	}
	380
	381	static ssize_t show_lcdtype(struct device dev, struct device_attribute attr,
	382	char *buf)
	383	{
	384	struct acpi_device *acpi = to_acpi_device(dev);
	385	struct pcc_acpi *pcc = acpi_driver_data(acpi);
	386
e253fb94	387	if (!acpi_pcc_retrieve_biosdata(pcc))
709ee531 HW	388	return -EIO;
709ee531 HW	389
ba256b41	390	return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
709ee531 HW	391	}
	392
	393	static ssize_t show_mute(struct device dev, struct device_attribute attr,
	394	char *buf)
	395	{
	396	struct acpi_device *acpi = to_acpi_device(dev);
	397	struct pcc_acpi *pcc = acpi_driver_data(acpi);
	398
e253fb94	399	if (!acpi_pcc_retrieve_biosdata(pcc))
709ee531 HW	400	return -EIO;
709ee531 HW	401
ba256b41	402	return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]);
709ee531 HW	403	}
	404
	405	static ssize_t show_sticky(struct device dev, struct device_attribute attr,
	406	char *buf)
	407	{
	408	struct acpi_device *acpi = to_acpi_device(dev);
	409	struct pcc_acpi *pcc = acpi_driver_data(acpi);
	410
e253fb94	411	if (!acpi_pcc_retrieve_biosdata(pcc))
709ee531 HW	412	return -EIO;
709ee531 HW	413
ba256b41	414	return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
709ee531 HW	415	}
	416
	417	static ssize_t set_sticky(struct device dev, struct device_attribute attr,
	418	const char *buf, size_t count)
	419	{
	420	struct acpi_device *acpi = to_acpi_device(dev);
	421	struct pcc_acpi *pcc = acpi_driver_data(acpi);
	422	int val;
	423
	424	if (count && sscanf(buf, "%i", &val) == 1 &&
	425	(val == 0 \|\| val == 1)) {
	426	acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
	427	pcc->sticky_mode = val;
	428	}
	429
	430	return count;
	431	}
	432
	433	static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
	434	static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
	435	static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
	436	static DEVICE_ATTR(sticky_key, S_IRUGO \| S_IWUSR, show_sticky, set_sticky);
	437
	438	static struct attribute *pcc_sysfs_entries[] = {
	439	&dev_attr_numbatt.attr,
	440	&dev_attr_lcdtype.attr,
	441	&dev_attr_mute.attr,
	442	&dev_attr_sticky_key.attr,
	443	NULL,
	444	};
	445
	446	static struct attribute_group pcc_attr_group = {
	447	.name = NULL, /* put in device directory */
	448	.attrs = pcc_sysfs_entries,
	449	};
	450
	451
	452	/* hotkey input device driver */
	453
709ee531 HW	454	static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
	455	{
	456	struct input_dev *hotk_input_dev = pcc->input_dev;
	457	int rc;
3e2dab9a	458	unsigned long long result;
709ee531	459
709ee531 HW	460	rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
	461	NULL, &result);
	462	if (!ACPI_SUCCESS(rc)) {
	463	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	464	"error getting hotkey status\n"));
	465	return;
	466	}
1a765cac DT	467	if (!sparse_keymap_report_event(hotk_input_dev,
1a765cac DT	468	result & 0xf, result & 0x80, false))
709ee531	469	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1a765cac	470	"Unknown hotkey event: %d\n", result));
709ee531 HW	471	}
709ee531 HW	472
cddd1f71	473	static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
709ee531	474	{
cddd1f71	475	struct pcc_acpi *pcc = acpi_driver_data(device);
709ee531	476
709ee531 HW	477	switch (event) {
	478	case HKEY_NOTIFY:
	479	acpi_pcc_generate_keyinput(pcc);
	480	break;
	481	default:
	482	/* nothing to do */
	483	break;
	484	}
	485	}
	486
	487	static int acpi_pcc_init_input(struct pcc_acpi *pcc)
	488	{
1a765cac DT	489	struct input_dev *input_dev;
1a765cac DT	490	int error;
709ee531	491
1a765cac	492	input_dev = input_allocate_device();
b222cca6	493	if (!input_dev)
709ee531	494	return -ENOMEM;
709ee531	495
1a765cac DT	496	input_dev->name = ACPI_PCC_DRIVER_NAME;
	497	input_dev->phys = ACPI_PCC_INPUT_PHYS;
	498	input_dev->id.bustype = BUS_HOST;
	499	input_dev->id.vendor = 0x0001;
	500	input_dev->id.product = 0x0001;
	501	input_dev->id.version = 0x0100;
709ee531	502
1a765cac DT	503	error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL);
	504	if (error) {
	505	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	506	"Unable to setup input device keymap\n"));
	507	goto err_free_dev;
	508	}
709ee531	509
1a765cac DT	510	error = input_register_device(input_dev);
	511	if (error) {
	512	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	513	"Unable to register input device\n"));
	514	goto err_free_keymap;
	515	}
709ee531	516
1a765cac DT	517	pcc->input_dev = input_dev;
1a765cac DT	518	return 0;
709ee531	519
1a765cac DT	520	err_free_keymap:
	521	sparse_keymap_free(input_dev);
	522	err_free_dev:
	523	input_free_device(input_dev);
	524	return error;
	525	}
709ee531	526
1a765cac DT	527	static void acpi_pcc_destroy_input(struct pcc_acpi *pcc)
	528	{
	529	sparse_keymap_free(pcc->input_dev);
	530	input_unregister_device(pcc->input_dev);
	531	/*
	532	* No need to input_free_device() since core input API refcounts
	533	* and free()s the device.
	534	*/
709ee531 HW	535	}
	536
	537	/* kernel module interface */
	538
3567a4e2	539	#ifdef CONFIG_PM_SLEEP
a7377419	540	static int acpi_pcc_hotkey_resume(struct device *dev)
709ee531	541	{
a7377419 RW	542	struct pcc_acpi *pcc;
	543
	544	if (!dev)
	545	return -EINVAL;
709ee531	546
a7377419 RW	547	pcc = acpi_driver_data(to_acpi_device(dev));
a7377419 RW	548	if (!pcc)
709ee531 HW	549	return -EINVAL;
	550
	551	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
	552	pcc->sticky_mode));
	553
9fab10cd	554	return acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
709ee531	555	}
3567a4e2	556	#endif
709ee531 HW	557
	558	static int acpi_pcc_hotkey_add(struct acpi_device *device)
	559	{
a19a6ee6	560	struct backlight_properties props;
709ee531 HW	561	struct pcc_acpi *pcc;
	562	int num_sifr, result;
	563
709ee531 HW	564	if (!device)
	565	return -EINVAL;
	566
	567	num_sifr = acpi_pcc_get_sqty(device);
	568
e424fb8c XW	569	if (num_sifr < 0 \|\| num_sifr > 255) {
e424fb8c XW	570	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr out of range"));
709ee531 HW	571	return -ENODEV;
	572	}
	573
	574	pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
	575	if (!pcc) {
	576	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	577	"Couldn't allocate mem for pcc"));
	578	return -ENOMEM;
	579	}
	580
	581	pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
	582	if (!pcc->sinf) {
	583	result = -ENOMEM;
	584	goto out_hotkey;
	585	}
	586
	587	pcc->device = device;
	588	pcc->handle = device->handle;
	589	pcc->num_sifr = num_sifr;
3e2dab9a	590	device->driver_data = pcc;
709ee531 HW	591	strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
	592	strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
	593
	594	result = acpi_pcc_init_input(pcc);
	595	if (result) {
	596	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	597	"Error installing keyinput handler\n"));
1a765cac	598	goto out_sinf;
709ee531 HW	599	}
709ee531 HW	600
e253fb94	601	if (!acpi_pcc_retrieve_biosdata(pcc)) {
709ee531 HW	602	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
709ee531 HW	603	"Couldn't retrieve BIOS data\n"));
aa13857f	604	result = -EIO;
a19a6ee6	605	goto out_input;
709ee531	606	}
a19a6ee6 MG	607	/* initialize backlight */
a19a6ee6 MG	608	memset(&props, 0, sizeof(struct backlight_properties));
bb7ca747	609	props.type = BACKLIGHT_PLATFORM;
a19a6ee6 MG	610	props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
	611	pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
	612	&pcc_backlight_ops, &props);
ec57af9c BP	613	if (IS_ERR(pcc->backlight)) {
ec57af9c BP	614	result = PTR_ERR(pcc->backlight);
1a765cac	615	goto out_input;
ec57af9c	616	}
709ee531 HW	617
709ee531 HW	618	/* read the initial brightness setting from the hardware */
709ee531 HW	619	pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
	620
	621	/* read the initial sticky key mode from the hardware */
	622	pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
	623
	624	/* add sysfs attributes */
	625	result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
	626	if (result)
	627	goto out_backlight;
	628
	629	return 0;
	630
	631	out_backlight:
	632	backlight_device_unregister(pcc->backlight);
1a765cac DT	633	out_input:
1a765cac DT	634	acpi_pcc_destroy_input(pcc);
a19a6ee6 MG	635	out_sinf:
a19a6ee6 MG	636	kfree(pcc->sinf);
709ee531 HW	637	out_hotkey:
	638	kfree(pcc);
	639
	640	return result;
	641	}
	642
51fac838	643	static int acpi_pcc_hotkey_remove(struct acpi_device *device)
709ee531 HW	644	{
	645	struct pcc_acpi *pcc = acpi_driver_data(device);
	646
709ee531 HW	647	if (!device \|\| !pcc)
	648	return -EINVAL;
	649
	650	sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
	651
	652	backlight_device_unregister(pcc->backlight);
	653
1a765cac	654	acpi_pcc_destroy_input(pcc);
709ee531 HW	655
	656	kfree(pcc->sinf);
	657	kfree(pcc);
	658
	659	return 0;
	660	}
	661
5c07eae9	662	module_acpi_driver(acpi_pcc_driver);