drivers/misc/sony-laptop.c

/*
 * ACPI Sony Notebook Control Driver (SNC)
 *
 * Copyright (C) 2004-2005 Stelian Pop <stelian@popies.net>
 * Copyright (C) 2007 Mattia Dongili <malattia@linux.it>
 *
 * Parts of this driver inspired from asus_acpi.c and ibm_acpi.c
 * which are copyrighted by their respective authors.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/backlight.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <acpi/acpi_drivers.h>
#include <acpi/acpi_bus.h>
#include <asm/uaccess.h>

#define ACPI_SNC_CLASS		"sony"
#define ACPI_SNC_HID		"SNY5001"
#define ACPI_SNC_DRIVER_NAME	"ACPI Sony Notebook Control Driver v0.4"

/* the device uses 1-based values, while the backlight subsystem uses
   0-based values */
#define SONY_MAX_BRIGHTNESS	8

#define LOG_PFX			KERN_WARNING "sony-laptop: "

MODULE_AUTHOR("Stelian Pop, Mattia Dongili");
MODULE_DESCRIPTION(ACPI_SNC_DRIVER_NAME);
MODULE_LICENSE("GPL");

static int debug;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "set this to 1 (and RTFM) if you want to help "
			"the development of this driver");

static int sony_backlight_update_status(struct backlight_device *bd);
static int sony_backlight_get_brightness(struct backlight_device *bd);
static struct backlight_device *sony_backlight_device;
static struct backlight_properties sony_backlight_properties = {
	.owner		= THIS_MODULE,
	.update_status	= sony_backlight_update_status,
	.get_brightness	= sony_backlight_get_brightness,
	.max_brightness	= SONY_MAX_BRIGHTNESS - 1,
};

static ssize_t sony_acpi_show(struct device *, struct device_attribute *, char *);
static ssize_t sony_acpi_store(struct device *, struct device_attribute *, const char *, size_t);

struct sony_acpi_value {
	char			*name;		/* name of the entry */
	char			**acpiget;	/* names of the ACPI get function */
	char			**acpiset;	/* names of the ACPI set function */
	int 			min;		/* minimum allowed value or -1 */
	int			max;		/* maximum allowed value or -1 */
	int			value;		/* current setting */
	int			valid;		/* Has ever been set */
	int			debug;		/* active only in debug mode ? */
	struct device_attribute	devattr;	/* sysfs atribute */
};

#define HANDLE_NAMES(_name, _values...) \
	static char *snc_##_name[] = { _values, NULL }

#define SONY_ACPI_VALUE(_name, _getters, _setters, _min, _max, _debug) \
	{ \
		.name		= __stringify(_name), \
		.acpiget	= _getters, \
		.acpiset	= _setters, \
		.min		= _min, \
		.max		= _max, \
		.debug		= _debug, \
		.devattr	= __ATTR(_name, 0, sony_acpi_show, sony_acpi_store), \
	}

#define SONY_ACPI_VALUE_NULL	{ .name = NULL }

HANDLE_NAMES(fnkey_get, "GHKE");

HANDLE_NAMES(brightness_def_get, "GPBR");
HANDLE_NAMES(brightness_def_set, "SPBR");

HANDLE_NAMES(cdpower_get, "GCDP");
HANDLE_NAMES(cdpower_set, "SCDP", "CDPW");

HANDLE_NAMES(audiopower_get, "GAZP");
HANDLE_NAMES(audiopower_set, "AZPW");

HANDLE_NAMES(lanpower_get, "GLNP");
HANDLE_NAMES(lanpower_set, "LNPW");

HANDLE_NAMES(PID_get, "GPID");

HANDLE_NAMES(CTR_get, "GCTR");
HANDLE_NAMES(CTR_set, "SCTR");

HANDLE_NAMES(PCR_get, "GPCR");
HANDLE_NAMES(PCR_set, "SPCR");

HANDLE_NAMES(CMI_get, "GCMI");
HANDLE_NAMES(CMI_set, "SCMI");

static struct sony_acpi_value sony_acpi_values[] = {
	SONY_ACPI_VALUE(brightness_default, snc_brightness_def_get, snc_brightness_def_set, 1, SONY_MAX_BRIGHTNESS, 0),
	SONY_ACPI_VALUE(fnkey,		snc_fnkey_get, NULL, -1, -1, 0),
	SONY_ACPI_VALUE(cdpower,	snc_cdpower_get, snc_cdpower_set, 0, 1, 0),
	SONY_ACPI_VALUE(audiopower,	snc_audiopower_get, snc_audiopower_set, 0, 1, 0),
	SONY_ACPI_VALUE(lanpower,	snc_lanpower_get, snc_lanpower_set, 0, 1, 1),
	/* unknown methods */
	SONY_ACPI_VALUE(PID,		snc_PID_get, NULL, -1, -1, 1),
	SONY_ACPI_VALUE(CTR,		snc_CTR_get, snc_CTR_set, -1, -1, 1),
	SONY_ACPI_VALUE(PCR,		snc_PCR_get, snc_PCR_set, -1, -1, 1),
	SONY_ACPI_VALUE(CMI,		snc_CMI_get, snc_CMI_set, -1, -1, 1),
	SONY_ACPI_VALUE_NULL
};

static acpi_handle sony_acpi_handle;
static struct acpi_device *sony_acpi_acpi_device = NULL;

static int acpi_callgetfunc(acpi_handle handle, char *name, int *result)
{
	struct acpi_buffer output;
	union acpi_object out_obj;
	acpi_status status;

	output.length = sizeof(out_obj);
	output.pointer = &out_obj;

	status = acpi_evaluate_object(handle, name, NULL, &output);
	if ((status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER)) {
		*result = out_obj.integer.value;
		return 0;
	}

	printk(LOG_PFX "acpi_callreadfunc failed\n");

	return -1;
}

static int acpi_callsetfunc(acpi_handle handle, char *name, int value,
			    int *result)
{
	struct acpi_object_list params;
	union acpi_object in_obj;
	struct acpi_buffer output;
	union acpi_object out_obj;
	acpi_status status;

	params.count = 1;
	params.pointer = &in_obj;
	in_obj.type = ACPI_TYPE_INTEGER;
	in_obj.integer.value = value;

	output.length = sizeof(out_obj);
	output.pointer = &out_obj;

	status = acpi_evaluate_object(handle, name, &params, &output);
	if (status == AE_OK) {
		if (result != NULL) {
			if (out_obj.type != ACPI_TYPE_INTEGER) {
				printk(LOG_PFX "acpi_evaluate_object bad "
				       "return type\n");
				return -1;
			}
			*result = out_obj.integer.value;
		}
		return 0;
	}

	printk(LOG_PFX "acpi_evaluate_object failed\n");

	return -1;
}

/*
 * Sysfs show/store common to all sony_acpi_values
 */
static ssize_t sony_acpi_show(struct device *dev, struct device_attribute *attr,
		char *buffer)
{
	int value;
	struct sony_acpi_value *item = container_of(attr, struct sony_acpi_value, devattr);

	if (!*item->acpiget)
		return -EIO;

	if (acpi_callgetfunc(sony_acpi_handle, *item->acpiget, &value) < 0)
		return -EIO;

	return snprintf(buffer, PAGE_SIZE, "%d\n", value);
}

static ssize_t sony_acpi_store(struct device *dev, struct device_attribute *attr,
		const char *buffer, size_t count)
{
	int value;
	struct sony_acpi_value *item = container_of(attr, struct sony_acpi_value, devattr);

	if (!item->acpiset)
		return -EIO;

	if (count > 31)
		return -EINVAL;

	value = simple_strtoul(buffer, NULL, 10);

	if (item->min != -1 && value < item->min)
		return -EINVAL;
	if (item->max != -1 && value > item->max)
		return -EINVAL;

	if (acpi_callsetfunc(sony_acpi_handle, *item->acpiset, value, NULL) < 0)
		return -EIO;
	item->value = value;
	item->valid = 1;
	return count;
}

/*
 * Platform device
 */
static struct platform_driver sncpf_driver = {
	.driver = {
		.name = "sony-laptop",
		.owner = THIS_MODULE,
	}
};
static struct platform_device *sncpf_device;

static int sony_snc_pf_add(void)
{
	acpi_handle handle;
	struct sony_acpi_value *item;
	int ret = 0;

	ret = platform_driver_register(&sncpf_driver);
	if (ret)
		goto out;

	sncpf_device = platform_device_alloc("sony-laptop", -1);
	if (!sncpf_device) {
		ret = -ENOMEM;
		goto out_platform_registered;
	}

	ret = platform_device_add(sncpf_device);
	if (ret)
		goto out_platform_alloced;

	for (item = sony_acpi_values; item->name; ++item) {

		if (!debug && item->debug)
			continue;

		/* find the available acpiget as described in the DSDT */
		for (; item->acpiget && *item->acpiget; ++item->acpiget) {
			if (ACPI_SUCCESS(acpi_get_handle(sony_acpi_handle,
							*item->acpiget,
							&handle))) {
				if (debug)
					printk(LOG_PFX "Found %s getter: %s\n",
							item->name,
							*item->acpiget);
				item->devattr.attr.mode |= S_IRUGO;
				break;
			}
		}

		/* find the available acpiset as described in the DSDT */
		for (; item->acpiset && *item->acpiset; ++item->acpiset) {
			if (ACPI_SUCCESS(acpi_get_handle(sony_acpi_handle,
							*item->acpiset,
							&handle))) {
				if (debug)
					printk(LOG_PFX "Found %s setter: %s\n",
							item->name,
							*item->acpiset);
				item->devattr.attr.mode |= S_IWUSR;
				break;
			}
		}

	       if (item->devattr.attr.mode != 0) {
		       ret = device_create_file(&sncpf_device->dev, &item->devattr);
		       if (ret)
			       goto out_sysfs;
	       }
	}

	return 0;

out_sysfs:
	for (item = sony_acpi_values; item->name; ++item) {
		device_remove_file(&sncpf_device->dev, &item->devattr);
	}
	platform_device_del(sncpf_device);
out_platform_alloced:
	platform_device_put(sncpf_device);
out_platform_registered:
	platform_driver_unregister(&sncpf_driver);
out:
	return ret;
}

static void sony_snc_pf_remove(void)
{
	struct sony_acpi_value *item;

	for (item = sony_acpi_values; item->name; ++item) {
		device_remove_file(&sncpf_device->dev, &item->devattr);
	}

	platform_device_del(sncpf_device);
	platform_device_put(sncpf_device);
	platform_driver_unregister(&sncpf_driver);
}

static int sony_acpi_resume(struct acpi_device *device)
{
	struct sony_acpi_value *item;

	for (item = sony_acpi_values; item->name; item++) {
		int ret;

		if (!item->valid)
			continue;
		ret = acpi_callsetfunc(sony_acpi_handle, *item->acpiset,
					item->value, NULL);
		if (ret < 0) {
			printk("%s: %d\n", __FUNCTION__, ret);
			break;
		}
	}
	return 0;
}

static void sony_acpi_notify(acpi_handle handle, u32 event, void *data)
{
	if (debug)
		printk(LOG_PFX "sony_acpi_notify, event: %d\n", event);
	acpi_bus_generate_event(sony_acpi_acpi_device, 1, event);
}

static acpi_status sony_walk_callback(acpi_handle handle, u32 level,
				      void *context, void **return_value)
{
	struct acpi_namespace_node *node;
	union acpi_operand_object *operand;

	node = (struct acpi_namespace_node *) handle;
	operand = (union acpi_operand_object *) node->object;

	printk(LOG_PFX "method: name: %4.4s, args %X\n", node->name.ascii,
	       (u32) operand->method.param_count);

	return AE_OK;
}

static int sony_acpi_add(struct acpi_device *device)
{
	acpi_status status;
	int result;
	acpi_handle handle;

	sony_acpi_acpi_device = device;

	sony_acpi_handle = device->handle;

	if (debug) {
		status = acpi_walk_namespace(ACPI_TYPE_METHOD, sony_acpi_handle,
					     1, sony_walk_callback, NULL, NULL);
		if (ACPI_FAILURE(status)) {
			printk(LOG_PFX "unable to walk acpi resources\n");
			result = -ENODEV;
			goto outwalk;
		}
	}

	status = acpi_install_notify_handler(sony_acpi_handle,
					     ACPI_DEVICE_NOTIFY,
					     sony_acpi_notify,
					     NULL);
	if (ACPI_FAILURE(status)) {
		printk(LOG_PFX "unable to install notify handler\n");
		result = -ENODEV;
		goto outwalk;
	}

	if (ACPI_SUCCESS(acpi_get_handle(sony_acpi_handle, "GBRT", &handle))) {
		sony_backlight_device = backlight_device_register("sony", NULL,
					NULL, &sony_backlight_properties);

	        if (IS_ERR(sony_backlight_device)) {
			printk(LOG_PFX "unable to register backlight device\n");
			sony_backlight_device = NULL;
		}
		else
			sony_backlight_properties.brightness =
				sony_backlight_get_brightness(sony_backlight_device);
	}

	if (sony_snc_pf_add())
		goto outbacklight;

	printk(KERN_INFO ACPI_SNC_DRIVER_NAME " successfully installed\n");

	return 0;

outbacklight:
	if (sony_backlight_device)
		backlight_device_unregister(sony_backlight_device);

	status = acpi_remove_notify_handler(sony_acpi_handle,
					    ACPI_DEVICE_NOTIFY,
					    sony_acpi_notify);
	if (ACPI_FAILURE(status))
		printk(LOG_PFX "unable to remove notify handler\n");
outwalk:
	return result;
}

static int sony_acpi_remove(struct acpi_device *device, int type)
{
	acpi_status status;

	if (sony_backlight_device)
		backlight_device_unregister(sony_backlight_device);

	sony_acpi_acpi_device = NULL;

	status = acpi_remove_notify_handler(sony_acpi_handle,
					    ACPI_DEVICE_NOTIFY,
					    sony_acpi_notify);
	if (ACPI_FAILURE(status))
		printk(LOG_PFX "unable to remove notify handler\n");

	sony_snc_pf_remove();

	printk(KERN_INFO ACPI_SNC_DRIVER_NAME " successfully removed\n");

	return 0;
}

static int sony_backlight_update_status(struct backlight_device *bd)
{
	return acpi_callsetfunc(sony_acpi_handle, "SBRT",
				bd->props->brightness + 1,
				NULL);
}

static int sony_backlight_get_brightness(struct backlight_device *bd)
{
	int value;

	if (acpi_callgetfunc(sony_acpi_handle, "GBRT", &value))
		return 0;
	/* brightness levels are 1-based, while backlight ones are 0-based */
	return value - 1;
}

static struct acpi_driver sony_acpi_driver = {
	.name	= ACPI_SNC_DRIVER_NAME,
	.class	= ACPI_SNC_CLASS,
	.ids	= ACPI_SNC_HID,
	.ops	= {
			.add	= sony_acpi_add,
			.remove	= sony_acpi_remove,
			.resume = sony_acpi_resume,
		  },
};

static int __init sony_acpi_init(void)
{
	return acpi_bus_register_driver(&sony_acpi_driver);
}


static void __exit sony_acpi_exit(void)
{
	acpi_bus_unregister_driver(&sony_acpi_driver);
}

module_init(sony_acpi_init);
module_exit(sony_acpi_exit);