[mirror_ubuntu-artful-kernel.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 <linux/acpi.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;
};

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


/* hotkey input device driver */

static int sleep_keydown_seen;
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_FAILURE(rc)) {
		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
				 "error getting hotkey status\n"));
		return;
	}

	/* hack: some firmware sends no key down for sleep / hibernate */
	if ((result & 0xf) == 0x7 || (result & 0xf) == 0xa) {
		if (result & 0x80)
			sleep_keydown_seen = 1;
		if (!sleep_keydown_seen)
			sparse_keymap_report_event(hotk_input_dev,
					result & 0xf, 0x80, false);
	}

	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_dev;
	}

	pcc->input_dev = input_dev;
	return 0;

 err_free_dev:
	input_free_device(input_dev);
	return error;
}

/* 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:
	input_unregister_device(pcc->input_dev);
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);

	input_unregister_device(pcc->input_dev);

	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>
8b48463f	128	#include <linux/acpi.h>
709ee531	129	#include <linux/input.h>
1a765cac	130	#include <linux/input/sparse-keymap.h>
709ee531	131
709ee531 HW	132	#ifndef ACPI_HOTKEY_COMPONENT
	133	#define ACPI_HOTKEY_COMPONENT 0x10000000
	134	#endif
	135
	136	#define _COMPONENT ACPI_HOTKEY_COMPONENT
	137
	138	MODULE_AUTHOR("Hiroshi Miura, David Bronaugh and Harald Welte");
	139	MODULE_DESCRIPTION("ACPI HotKey driver for Panasonic Let's Note laptops");
	140	MODULE_LICENSE("GPL");
	141
	142	#define LOGPREFIX "pcc_acpi: "
	143
	144	/* Define ACPI PATHs */
	145	/* Lets note hotkeys */
	146	#define METHOD_HKEY_QUERY "HINF"
	147	#define METHOD_HKEY_SQTY "SQTY"
	148	#define METHOD_HKEY_SINF "SINF"
	149	#define METHOD_HKEY_SSET "SSET"
	150	#define HKEY_NOTIFY 0x80
	151
	152	#define ACPI_PCC_DRIVER_NAME "Panasonic Laptop Support"
	153	#define ACPI_PCC_DEVICE_NAME "Hotkey"
	154	#define ACPI_PCC_CLASS "pcc"
	155
	156	#define ACPI_PCC_INPUT_PHYS "panasonic/hkey0"
	157
	158	/* LCD_TYPEs: 0 = Normal, 1 = Semi-transparent
	159	ENV_STATEs: Normal temp=0x01, High temp=0x81, N/A=0x00
	160	*/
	161	enum SINF_BITS { SINF_NUM_BATTERIES = 0,
	162	SINF_LCD_TYPE,
	163	SINF_AC_MAX_BRIGHT,
	164	SINF_AC_MIN_BRIGHT,
	165	SINF_AC_CUR_BRIGHT,
	166	SINF_DC_MAX_BRIGHT,
	167	SINF_DC_MIN_BRIGHT,
	168	SINF_DC_CUR_BRIGHT,
	169	SINF_MUTE,
	170	SINF_RESERVED,
	171	SINF_ENV_STATE,
	172	SINF_STICKY_KEY = 0x80,
	173	};
	174	/* R1 handles SINF_AC_CUR_BRIGHT as SINF_CUR_BRIGHT, doesn't know AC state */
	175
	176	static int acpi_pcc_hotkey_add(struct acpi_device *device);
51fac838	177	static int acpi_pcc_hotkey_remove(struct acpi_device *device);
cddd1f71	178	static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event);
709ee531 HW	179
	180	static const struct acpi_device_id pcc_device_ids[] = {
	181	{ "MAT0012", 0},
	182	{ "MAT0013", 0},
	183	{ "MAT0018", 0},
	184	{ "MAT0019", 0},
	185	{ "", 0},
	186	};
c542aade	187	MODULE_DEVICE_TABLE(acpi, pcc_device_ids);
709ee531	188
3567a4e2	189	#ifdef CONFIG_PM_SLEEP
a7377419	190	static int acpi_pcc_hotkey_resume(struct device *dev);
3567a4e2	191	#endif
a7377419 RW	192	static SIMPLE_DEV_PM_OPS(acpi_pcc_hotkey_pm, NULL, acpi_pcc_hotkey_resume);
a7377419 RW	193
709ee531 HW	194	static struct acpi_driver acpi_pcc_driver = {
	195	.name = ACPI_PCC_DRIVER_NAME,
	196	.class = ACPI_PCC_CLASS,
	197	.ids = pcc_device_ids,
	198	.ops = {
	199	.add = acpi_pcc_hotkey_add,
	200	.remove = acpi_pcc_hotkey_remove,
cddd1f71	201	.notify = acpi_pcc_hotkey_notify,
709ee531	202	},
a7377419	203	.drv.pm = &acpi_pcc_hotkey_pm,
709ee531 HW	204	};
709ee531 HW	205
1a765cac DT	206	static const struct key_entry panasonic_keymap[] = {
	207	{ KE_KEY, 0, { KEY_RESERVED } },
	208	{ KE_KEY, 1, { KEY_BRIGHTNESSDOWN } },
	209	{ KE_KEY, 2, { KEY_BRIGHTNESSUP } },
	210	{ KE_KEY, 3, { KEY_DISPLAYTOGGLE } },
	211	{ KE_KEY, 4, { KEY_MUTE } },
	212	{ KE_KEY, 5, { KEY_VOLUMEDOWN } },
	213	{ KE_KEY, 6, { KEY_VOLUMEUP } },
	214	{ KE_KEY, 7, { KEY_SLEEP } },
	215	{ KE_KEY, 8, { KEY_PROG1 } }, /* Change CPU boost */
	216	{ KE_KEY, 9, { KEY_BATTERY } },
	217	{ KE_KEY, 10, { KEY_SUSPEND } },
	218	{ KE_END, 0 }
709ee531 HW	219	};
	220
	221	struct pcc_acpi {
	222	acpi_handle handle;
	223	unsigned long num_sifr;
	224	int sticky_mode;
1a765cac	225	u32 *sinf;
709ee531 HW	226	struct acpi_device *device;
	227	struct input_dev *input_dev;
	228	struct backlight_device *backlight;
709ee531 HW	229	};
709ee531 HW	230
709ee531 HW	231	/* method access functions */
	232	static int acpi_pcc_write_sset(struct pcc_acpi *pcc, int func, int val)
	233	{
	234	union acpi_object in_objs[] = {
	235	{ .integer.type = ACPI_TYPE_INTEGER,
	236	.integer.value = func, },
	237	{ .integer.type = ACPI_TYPE_INTEGER,
	238	.integer.value = val, },
	239	};
	240	struct acpi_object_list params = {
	241	.count = ARRAY_SIZE(in_objs),
	242	.pointer = in_objs,
	243	};
	244	acpi_status status = AE_OK;
	245
709ee531 HW	246	status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SSET,
	247	&params, NULL);
	248
9fab10cd	249	return (status == AE_OK) ? 0 : -EIO;
709ee531 HW	250	}
	251
	252	static inline int acpi_pcc_get_sqty(struct acpi_device *device)
	253	{
3e2dab9a	254	unsigned long long s;
709ee531 HW	255	acpi_status status;
709ee531 HW	256
709ee531 HW	257	status = acpi_evaluate_integer(device->handle, METHOD_HKEY_SQTY,
	258	NULL, &s);
	259	if (ACPI_SUCCESS(status))
	260	return s;
	261	else {
	262	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	263	"evaluation error HKEY.SQTY\n"));
	264	return -EINVAL;
	265	}
	266	}
	267
e253fb94	268	static int acpi_pcc_retrieve_biosdata(struct pcc_acpi *pcc)
709ee531 HW	269	{
	270	acpi_status status;
	271	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	272	union acpi_object *hkey = NULL;
	273	int i;
	274
a3c27056	275	status = acpi_evaluate_object(pcc->handle, METHOD_HKEY_SINF, NULL,
709ee531 HW	276	&buffer);
	277	if (ACPI_FAILURE(status)) {
	278	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	279	"evaluation error HKEY.SINF\n"));
	280	return 0;
	281	}
	282
	283	hkey = buffer.pointer;
	284	if (!hkey \|\| (hkey->type != ACPI_TYPE_PACKAGE)) {
	285	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid HKEY.SINF\n"));
aa13857f	286	status = AE_ERROR;
709ee531 HW	287	goto end;
	288	}
	289
	290	if (pcc->num_sifr < hkey->package.count) {
	291	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	292	"SQTY reports bad SINF length\n"));
	293	status = AE_ERROR;
	294	goto end;
	295	}
	296
	297	for (i = 0; i < hkey->package.count; i++) {
	298	union acpi_object *element = &(hkey->package.elements[i]);
	299	if (likely(element->type == ACPI_TYPE_INTEGER)) {
e253fb94	300	pcc->sinf[i] = element->integer.value;
709ee531 HW	301	} else
	302	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	303	"Invalid HKEY.SINF data\n"));
	304	}
e253fb94	305	pcc->sinf[hkey->package.count] = -1;
709ee531 HW	306
	307	end:
	308	kfree(buffer.pointer);
	309	return status == AE_OK;
	310	}
	311
	312	/* backlight API interface functions */
	313
	314	/* This driver currently treats AC and DC brightness identical,
	315	* since we don't need to invent an interface to the core ACPI
	316	* logic to receive events in case a power supply is plugged in
	317	* or removed */
	318
	319	static int bl_get(struct backlight_device *bd)
	320	{
	321	struct pcc_acpi *pcc = bl_get_data(bd);
	322
e253fb94	323	if (!acpi_pcc_retrieve_biosdata(pcc))
709ee531 HW	324	return -EIO;
	325
	326	return pcc->sinf[SINF_AC_CUR_BRIGHT];
	327	}
	328
	329	static int bl_set_status(struct backlight_device *bd)
	330	{
	331	struct pcc_acpi *pcc = bl_get_data(bd);
	332	int bright = bd->props.brightness;
	333	int rc;
	334
e253fb94	335	if (!acpi_pcc_retrieve_biosdata(pcc))
709ee531 HW	336	return -EIO;
	337
	338	if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT])
	339	bright = pcc->sinf[SINF_AC_MIN_BRIGHT];
	340
	341	if (bright < pcc->sinf[SINF_DC_MIN_BRIGHT])
	342	bright = pcc->sinf[SINF_DC_MIN_BRIGHT];
	343
	344	if (bright < pcc->sinf[SINF_AC_MIN_BRIGHT] \|\|
	345	bright > pcc->sinf[SINF_AC_MAX_BRIGHT])
	346	return -EINVAL;
	347
	348	rc = acpi_pcc_write_sset(pcc, SINF_AC_CUR_BRIGHT, bright);
	349	if (rc < 0)
	350	return rc;
	351
	352	return acpi_pcc_write_sset(pcc, SINF_DC_CUR_BRIGHT, bright);
	353	}
	354
ec57af9c	355	static const struct backlight_ops pcc_backlight_ops = {
709ee531 HW	356	.get_brightness = bl_get,
	357	.update_status = bl_set_status,
	358	};
	359
	360
	361	/* sysfs user interface functions */
	362
	363	static ssize_t show_numbatt(struct device dev, struct device_attribute attr,
	364	char *buf)
	365	{
	366	struct acpi_device *acpi = to_acpi_device(dev);
	367	struct pcc_acpi *pcc = acpi_driver_data(acpi);
	368
e253fb94	369	if (!acpi_pcc_retrieve_biosdata(pcc))
709ee531 HW	370	return -EIO;
709ee531 HW	371
ba256b41	372	return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_NUM_BATTERIES]);
709ee531 HW	373	}
	374
	375	static ssize_t show_lcdtype(struct device dev, struct device_attribute attr,
	376	char *buf)
	377	{
	378	struct acpi_device *acpi = to_acpi_device(dev);
	379	struct pcc_acpi *pcc = acpi_driver_data(acpi);
	380
e253fb94	381	if (!acpi_pcc_retrieve_biosdata(pcc))
709ee531 HW	382	return -EIO;
709ee531 HW	383
ba256b41	384	return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_LCD_TYPE]);
709ee531 HW	385	}
	386
	387	static ssize_t show_mute(struct device dev, struct device_attribute attr,
	388	char *buf)
	389	{
	390	struct acpi_device *acpi = to_acpi_device(dev);
	391	struct pcc_acpi *pcc = acpi_driver_data(acpi);
	392
e253fb94	393	if (!acpi_pcc_retrieve_biosdata(pcc))
709ee531 HW	394	return -EIO;
709ee531 HW	395
ba256b41	396	return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_MUTE]);
709ee531 HW	397	}
	398
	399	static ssize_t show_sticky(struct device dev, struct device_attribute attr,
	400	char *buf)
	401	{
	402	struct acpi_device *acpi = to_acpi_device(dev);
	403	struct pcc_acpi *pcc = acpi_driver_data(acpi);
	404
e253fb94	405	if (!acpi_pcc_retrieve_biosdata(pcc))
709ee531 HW	406	return -EIO;
709ee531 HW	407
ba256b41	408	return snprintf(buf, PAGE_SIZE, "%u\n", pcc->sinf[SINF_STICKY_KEY]);
709ee531 HW	409	}
	410
	411	static ssize_t set_sticky(struct device dev, struct device_attribute attr,
	412	const char *buf, size_t count)
	413	{
	414	struct acpi_device *acpi = to_acpi_device(dev);
	415	struct pcc_acpi *pcc = acpi_driver_data(acpi);
	416	int val;
	417
	418	if (count && sscanf(buf, "%i", &val) == 1 &&
	419	(val == 0 \|\| val == 1)) {
	420	acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, val);
	421	pcc->sticky_mode = val;
	422	}
	423
	424	return count;
	425	}
	426
	427	static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
	428	static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
	429	static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
	430	static DEVICE_ATTR(sticky_key, S_IRUGO \| S_IWUSR, show_sticky, set_sticky);
	431
	432	static struct attribute *pcc_sysfs_entries[] = {
	433	&dev_attr_numbatt.attr,
	434	&dev_attr_lcdtype.attr,
	435	&dev_attr_mute.attr,
	436	&dev_attr_sticky_key.attr,
	437	NULL,
	438	};
	439
24f58405	440	static const struct attribute_group pcc_attr_group = {
709ee531 HW	441	.name = NULL, /* put in device directory */
	442	.attrs = pcc_sysfs_entries,
	443	};
	444
	445
	446	/* hotkey input device driver */
	447
58c68865	448	static int sleep_keydown_seen;
709ee531 HW	449	static void acpi_pcc_generate_keyinput(struct pcc_acpi *pcc)
	450	{
	451	struct input_dev *hotk_input_dev = pcc->input_dev;
	452	int rc;
3e2dab9a	453	unsigned long long result;
709ee531	454
709ee531 HW	455	rc = acpi_evaluate_integer(pcc->handle, METHOD_HKEY_QUERY,
709ee531 HW	456	NULL, &result);
3526ecad	457	if (ACPI_FAILURE(rc)) {
709ee531 HW	458	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	459	"error getting hotkey status\n"));
	460	return;
	461	}
58c68865 SS	462
	463	/* hack: some firmware sends no key down for sleep / hibernate */
	464	if ((result & 0xf) == 0x7 \|\| (result & 0xf) == 0xa) {
	465	if (result & 0x80)
	466	sleep_keydown_seen = 1;
	467	if (!sleep_keydown_seen)
	468	sparse_keymap_report_event(hotk_input_dev,
	469	result & 0xf, 0x80, false);
	470	}
	471
1a765cac DT	472	if (!sparse_keymap_report_event(hotk_input_dev,
1a765cac DT	473	result & 0xf, result & 0x80, false))
709ee531	474	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
1a765cac	475	"Unknown hotkey event: %d\n", result));
709ee531 HW	476	}
709ee531 HW	477
cddd1f71	478	static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
709ee531	479	{
cddd1f71	480	struct pcc_acpi *pcc = acpi_driver_data(device);
709ee531	481
709ee531 HW	482	switch (event) {
	483	case HKEY_NOTIFY:
	484	acpi_pcc_generate_keyinput(pcc);
	485	break;
	486	default:
	487	/* nothing to do */
	488	break;
	489	}
	490	}
	491
	492	static int acpi_pcc_init_input(struct pcc_acpi *pcc)
	493	{
1a765cac DT	494	struct input_dev *input_dev;
1a765cac DT	495	int error;
709ee531	496
1a765cac	497	input_dev = input_allocate_device();
b222cca6	498	if (!input_dev)
709ee531	499	return -ENOMEM;
709ee531	500
1a765cac DT	501	input_dev->name = ACPI_PCC_DRIVER_NAME;
	502	input_dev->phys = ACPI_PCC_INPUT_PHYS;
	503	input_dev->id.bustype = BUS_HOST;
	504	input_dev->id.vendor = 0x0001;
	505	input_dev->id.product = 0x0001;
	506	input_dev->id.version = 0x0100;
709ee531	507
1a765cac DT	508	error = sparse_keymap_setup(input_dev, panasonic_keymap, NULL);
	509	if (error) {
	510	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	511	"Unable to setup input device keymap\n"));
	512	goto err_free_dev;
	513	}
709ee531	514
1a765cac DT	515	error = input_register_device(input_dev);
	516	if (error) {
	517	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	518	"Unable to register input device\n"));
b09b9195	519	goto err_free_dev;
1a765cac	520	}
709ee531	521
1a765cac DT	522	pcc->input_dev = input_dev;
1a765cac DT	523	return 0;
709ee531	524
1a765cac DT	525	err_free_dev:
	526	input_free_device(input_dev);
	527	return error;
	528	}
709ee531	529
709ee531 HW	530	/* kernel module interface */
709ee531 HW	531
3567a4e2	532	#ifdef CONFIG_PM_SLEEP
a7377419	533	static int acpi_pcc_hotkey_resume(struct device *dev)
709ee531	534	{
a7377419 RW	535	struct pcc_acpi *pcc;
	536
	537	if (!dev)
	538	return -EINVAL;
709ee531	539
a7377419 RW	540	pcc = acpi_driver_data(to_acpi_device(dev));
a7377419 RW	541	if (!pcc)
709ee531 HW	542	return -EINVAL;
	543
	544	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Sticky mode restore: %d\n",
	545	pcc->sticky_mode));
	546
9fab10cd	547	return acpi_pcc_write_sset(pcc, SINF_STICKY_KEY, pcc->sticky_mode);
709ee531	548	}
3567a4e2	549	#endif
709ee531 HW	550
	551	static int acpi_pcc_hotkey_add(struct acpi_device *device)
	552	{
a19a6ee6	553	struct backlight_properties props;
709ee531 HW	554	struct pcc_acpi *pcc;
	555	int num_sifr, result;
	556
709ee531 HW	557	if (!device)
	558	return -EINVAL;
	559
	560	num_sifr = acpi_pcc_get_sqty(device);
	561
e424fb8c XW	562	if (num_sifr < 0 \|\| num_sifr > 255) {
e424fb8c XW	563	ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "num_sifr out of range"));
709ee531 HW	564	return -ENODEV;
	565	}
	566
	567	pcc = kzalloc(sizeof(struct pcc_acpi), GFP_KERNEL);
	568	if (!pcc) {
	569	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	570	"Couldn't allocate mem for pcc"));
	571	return -ENOMEM;
	572	}
	573
	574	pcc->sinf = kzalloc(sizeof(u32) * (num_sifr + 1), GFP_KERNEL);
	575	if (!pcc->sinf) {
	576	result = -ENOMEM;
	577	goto out_hotkey;
	578	}
	579
	580	pcc->device = device;
	581	pcc->handle = device->handle;
	582	pcc->num_sifr = num_sifr;
3e2dab9a	583	device->driver_data = pcc;
709ee531 HW	584	strcpy(acpi_device_name(device), ACPI_PCC_DEVICE_NAME);
	585	strcpy(acpi_device_class(device), ACPI_PCC_CLASS);
	586
	587	result = acpi_pcc_init_input(pcc);
	588	if (result) {
	589	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
	590	"Error installing keyinput handler\n"));
1a765cac	591	goto out_sinf;
709ee531 HW	592	}
709ee531 HW	593
e253fb94	594	if (!acpi_pcc_retrieve_biosdata(pcc)) {
709ee531 HW	595	ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
709ee531 HW	596	"Couldn't retrieve BIOS data\n"));
aa13857f	597	result = -EIO;
a19a6ee6	598	goto out_input;
709ee531	599	}
a19a6ee6 MG	600	/* initialize backlight */
a19a6ee6 MG	601	memset(&props, 0, sizeof(struct backlight_properties));
bb7ca747	602	props.type = BACKLIGHT_PLATFORM;
a19a6ee6 MG	603	props.max_brightness = pcc->sinf[SINF_AC_MAX_BRIGHT];
	604	pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
	605	&pcc_backlight_ops, &props);
ec57af9c BP	606	if (IS_ERR(pcc->backlight)) {
ec57af9c BP	607	result = PTR_ERR(pcc->backlight);
1a765cac	608	goto out_input;
ec57af9c	609	}
709ee531 HW	610
709ee531 HW	611	/* read the initial brightness setting from the hardware */
709ee531 HW	612	pcc->backlight->props.brightness = pcc->sinf[SINF_AC_CUR_BRIGHT];
	613
	614	/* read the initial sticky key mode from the hardware */
	615	pcc->sticky_mode = pcc->sinf[SINF_STICKY_KEY];
	616
	617	/* add sysfs attributes */
	618	result = sysfs_create_group(&device->dev.kobj, &pcc_attr_group);
	619	if (result)
	620	goto out_backlight;
	621
	622	return 0;
	623
	624	out_backlight:
	625	backlight_device_unregister(pcc->backlight);
1a765cac	626	out_input:
b09b9195	627	input_unregister_device(pcc->input_dev);
a19a6ee6 MG	628	out_sinf:
a19a6ee6 MG	629	kfree(pcc->sinf);
709ee531 HW	630	out_hotkey:
	631	kfree(pcc);
	632
	633	return result;
	634	}
	635
51fac838	636	static int acpi_pcc_hotkey_remove(struct acpi_device *device)
709ee531 HW	637	{
	638	struct pcc_acpi *pcc = acpi_driver_data(device);
	639
709ee531 HW	640	if (!device \|\| !pcc)
	641	return -EINVAL;
	642
	643	sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
	644
	645	backlight_device_unregister(pcc->backlight);
	646
b09b9195	647	input_unregister_device(pcc->input_dev);
709ee531 HW	648
	649	kfree(pcc->sinf);
	650	kfree(pcc);
	651
	652	return 0;
	653	}
	654
5c07eae9	655	module_acpi_driver(acpi_pcc_driver);