[people/ms/linux.git] / drivers / acpi / fan.c

/*
 *  acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/thermal.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>
#include <linux/sort.h>

MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION("ACPI Fan Driver");
MODULE_LICENSE("GPL");

static int acpi_fan_probe(struct platform_device *pdev);
static int acpi_fan_remove(struct platform_device *pdev);

static const struct acpi_device_id fan_device_ids[] = {
	{"PNP0C0B", 0},
	{"INT3404", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, fan_device_ids);

#ifdef CONFIG_PM_SLEEP
static int acpi_fan_suspend(struct device *dev);
static int acpi_fan_resume(struct device *dev);
static struct dev_pm_ops acpi_fan_pm = {
	.resume = acpi_fan_resume,
	.freeze = acpi_fan_suspend,
	.thaw = acpi_fan_resume,
	.restore = acpi_fan_resume,
};
#define FAN_PM_OPS_PTR (&acpi_fan_pm)
#else
#define FAN_PM_OPS_PTR NULL
#endif

struct acpi_fan_fps {
	u64 control;
	u64 trip_point;
	u64 speed;
	u64 noise_level;
	u64 power;
};

struct acpi_fan_fif {
	u64 revision;
	u64 fine_grain_ctrl;
	u64 step_size;
	u64 low_speed_notification;
};

struct acpi_fan {
	bool acpi4;
	struct acpi_fan_fif fif;
	struct acpi_fan_fps *fps;
	int fps_count;
	struct thermal_cooling_device *cdev;
};

static struct platform_driver acpi_fan_driver = {
	.probe = acpi_fan_probe,
	.remove = acpi_fan_remove,
	.driver = {
		.name = "acpi-fan",
		.acpi_match_table = fan_device_ids,
		.pm = FAN_PM_OPS_PTR,
	},
};

/* thermal cooling device callbacks */
static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
			     *state)
{
	struct acpi_device *device = cdev->devdata;
	struct acpi_fan *fan = acpi_driver_data(device);

	if (fan->acpi4)
		*state = fan->fps_count - 1;
	else
		*state = 1;
	return 0;
}

static int fan_get_state_acpi4(struct acpi_device *device, unsigned long *state)
{
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_fan *fan = acpi_driver_data(device);
	union acpi_object *obj;
	acpi_status status;
	int control, i;

	status = acpi_evaluate_object(device->handle, "_FST", NULL, &buffer);
	if (ACPI_FAILURE(status)) {
		dev_err(&device->dev, "Get fan state failed\n");
		return status;
	}

	obj = buffer.pointer;
	if (!obj || obj->type != ACPI_TYPE_PACKAGE ||
	    obj->package.count != 3 ||
	    obj->package.elements[1].type != ACPI_TYPE_INTEGER) {
		dev_err(&device->dev, "Invalid _FST data\n");
		status = -EINVAL;
		goto err;
	}

	control = obj->package.elements[1].integer.value;
	for (i = 0; i < fan->fps_count; i++) {
		if (control == fan->fps[i].control)
			break;
	}
	if (i == fan->fps_count) {
		dev_dbg(&device->dev, "Invalid control value returned\n");
		status = -EINVAL;
		goto err;
	}

	*state = i;

err:
	kfree(obj);
	return status;
}

static int fan_get_state(struct acpi_device *device, unsigned long *state)
{
	int result;
	int acpi_state = ACPI_STATE_D0;

	result = acpi_device_update_power(device, &acpi_state);
	if (result)
		return result;

	*state = acpi_state == ACPI_STATE_D3_COLD
			|| acpi_state == ACPI_STATE_D3_HOT ?
		0 : (acpi_state == ACPI_STATE_D0 ? 1 : -1);
	return 0;
}

static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
			     *state)
{
	struct acpi_device *device = cdev->devdata;
	struct acpi_fan *fan = acpi_driver_data(device);

	if (fan->acpi4)
		return fan_get_state_acpi4(device, state);
	else
		return fan_get_state(device, state);
}

static int fan_set_state(struct acpi_device *device, unsigned long state)
{
	if (state != 0 && state != 1)
		return -EINVAL;

	return acpi_device_set_power(device,
				     state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
}

static int fan_set_state_acpi4(struct acpi_device *device, unsigned long state)
{
	struct acpi_fan *fan = acpi_driver_data(device);
	acpi_status status;

	if (state >= fan->fps_count)
		return -EINVAL;

	status = acpi_execute_simple_method(device->handle, "_FSL",
					    fan->fps[state].control);
	if (ACPI_FAILURE(status)) {
		dev_dbg(&device->dev, "Failed to set state by _FSL\n");
		return status;
	}

	return 0;
}

static int
fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
{
	struct acpi_device *device = cdev->devdata;
	struct acpi_fan *fan = acpi_driver_data(device);

	if (fan->acpi4)
		return fan_set_state_acpi4(device, state);
	else
		return fan_set_state(device, state);
 }

static const struct thermal_cooling_device_ops fan_cooling_ops = {
	.get_max_state = fan_get_max_state,
	.get_cur_state = fan_get_cur_state,
	.set_cur_state = fan_set_cur_state,
};

/* --------------------------------------------------------------------------
 *                               Driver Interface
 * --------------------------------------------------------------------------
*/

static bool acpi_fan_is_acpi4(struct acpi_device *device)
{
	return acpi_has_method(device->handle, "_FIF") &&
	       acpi_has_method(device->handle, "_FPS") &&
	       acpi_has_method(device->handle, "_FSL") &&
	       acpi_has_method(device->handle, "_FST");
}

static int acpi_fan_get_fif(struct acpi_device *device)
{
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	struct acpi_fan *fan = acpi_driver_data(device);
	struct acpi_buffer format = { sizeof("NNNN"), "NNNN" };
	struct acpi_buffer fif = { sizeof(fan->fif), &fan->fif };
	union acpi_object *obj;
	acpi_status status;

	status = acpi_evaluate_object(device->handle, "_FIF", NULL, &buffer);
	if (ACPI_FAILURE(status))
		return status;

	obj = buffer.pointer;
	if (!obj || obj->type != ACPI_TYPE_PACKAGE) {
		dev_err(&device->dev, "Invalid _FIF data\n");
		status = -EINVAL;
		goto err;
	}

	status = acpi_extract_package(obj, &format, &fif);
	if (ACPI_FAILURE(status)) {
		dev_err(&device->dev, "Invalid _FIF element\n");
		status = -EINVAL;
	}

err:
	kfree(obj);
	return status;
}

static int acpi_fan_speed_cmp(const void *a, const void *b)
{
	const struct acpi_fan_fps *fps1 = a;
	const struct acpi_fan_fps *fps2 = b;
	return fps1->speed - fps2->speed;
}

static int acpi_fan_get_fps(struct acpi_device *device)
{
	struct acpi_fan *fan = acpi_driver_data(device);
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;
	acpi_status status;
	int i;

	status = acpi_evaluate_object(device->handle, "_FPS", NULL, &buffer);
	if (ACPI_FAILURE(status))
		return status;

	obj = buffer.pointer;
	if (!obj || obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
		dev_err(&device->dev, "Invalid _FPS data\n");
		status = -EINVAL;
		goto err;
	}

	fan->fps_count = obj->package.count - 1; /* minus revision field */
	fan->fps = devm_kzalloc(&device->dev,
				fan->fps_count * sizeof(struct acpi_fan_fps),
				GFP_KERNEL);
	if (!fan->fps) {
		dev_err(&device->dev, "Not enough memory\n");
		status = -ENOMEM;
		goto err;
	}
	for (i = 0; i < fan->fps_count; i++) {
		struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
		struct acpi_buffer fps = { sizeof(fan->fps[i]), &fan->fps[i] };
		status = acpi_extract_package(&obj->package.elements[i + 1],
					      &format, &fps);
		if (ACPI_FAILURE(status)) {
			dev_err(&device->dev, "Invalid _FPS element\n");
			break;
		}
	}

	/* sort the state array according to fan speed in increase order */
	sort(fan->fps, fan->fps_count, sizeof(*fan->fps),
	     acpi_fan_speed_cmp, NULL);

err:
	kfree(obj);
	return status;
}

static int acpi_fan_probe(struct platform_device *pdev)
{
	int result = 0;
	struct thermal_cooling_device *cdev;
	struct acpi_fan *fan;
	struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
	char *name;

	fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
	if (!fan) {
		dev_err(&device->dev, "No memory for fan\n");
		return -ENOMEM;
	}
	device->driver_data = fan;
	platform_set_drvdata(pdev, fan);

	if (acpi_fan_is_acpi4(device)) {
		if (acpi_fan_get_fif(device) || acpi_fan_get_fps(device))
			goto end;
		fan->acpi4 = true;
	} else {
		result = acpi_device_update_power(device, NULL);
		if (result) {
			dev_err(&device->dev, "Setting initial power state\n");
			goto end;
		}
	}

	if (!strncmp(pdev->name, "PNP0C0B", strlen("PNP0C0B")))
		name = "Fan";
	else
		name = acpi_device_bid(device);

	cdev = thermal_cooling_device_register(name, device,
						&fan_cooling_ops);
	if (IS_ERR(cdev)) {
		result = PTR_ERR(cdev);
		goto end;
	}

	dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id);

	fan->cdev = cdev;
	result = sysfs_create_link(&pdev->dev.kobj,
				   &cdev->device.kobj,
				   "thermal_cooling");
	if (result)
		dev_err(&pdev->dev, "Failed to create sysfs link 'thermal_cooling'\n");

	result = sysfs_create_link(&cdev->device.kobj,
				   &pdev->dev.kobj,
				   "device");
	if (result)
		dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n");

end:
	return result;
}

static int acpi_fan_remove(struct platform_device *pdev)
{
	struct acpi_fan *fan = platform_get_drvdata(pdev);

	sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling");
	sysfs_remove_link(&fan->cdev->device.kobj, "device");
	thermal_cooling_device_unregister(fan->cdev);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int acpi_fan_suspend(struct device *dev)
{
	struct acpi_fan *fan = dev_get_drvdata(dev);
	if (fan->acpi4)
		return 0;

	acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0);

	return AE_OK;
}

static int acpi_fan_resume(struct device *dev)
{
	int result;
	struct acpi_fan *fan = dev_get_drvdata(dev);

	if (fan->acpi4)
		return 0;

	result = acpi_device_update_power(ACPI_COMPANION(dev), NULL);
	if (result)
		dev_err(dev, "Error updating fan power state\n");

	return result;
}
#endif

module_platform_driver(acpi_fan_driver);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
	3	*
	4	* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
	5	* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
	6	*
	7	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or (at
	12	* your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
1da177e4 LT	19	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	20	*/
	21
	22	#include <linux/kernel.h>
	23	#include <linux/module.h>
	24	#include <linux/init.h>
	25	#include <linux/types.h>
88989fd2	26	#include <linux/uaccess.h>
05a83d97	27	#include <linux/thermal.h>
8b48463f	28	#include <linux/acpi.h>
19593a1f	29	#include <linux/platform_device.h>
9519a635	30	#include <linux/sort.h>
1da177e4	31
f52fd66d	32	MODULE_AUTHOR("Paul Diefenbaugh");
7cda93e0	33	MODULE_DESCRIPTION("ACPI Fan Driver");
1da177e4 LT	34	MODULE_LICENSE("GPL");
1da177e4 LT	35
19593a1f AL	36	static int acpi_fan_probe(struct platform_device *pdev);
19593a1f AL	37	static int acpi_fan_remove(struct platform_device *pdev);
1da177e4	38
1ba90e3a TR	39	static const struct acpi_device_id fan_device_ids[] = {
1ba90e3a TR	40	{"PNP0C0B", 0},
d806c6e9	41	{"INT3404", 0},
1ba90e3a TR	42	{"", 0},
	43	};
	44	MODULE_DEVICE_TABLE(acpi, fan_device_ids);
	45
90692404	46	#ifdef CONFIG_PM_SLEEP
62fcbdd9 RW	47	static int acpi_fan_suspend(struct device *dev);
62fcbdd9 RW	48	static int acpi_fan_resume(struct device *dev);
b9b8515f AL	49	static struct dev_pm_ops acpi_fan_pm = {
	50	.resume = acpi_fan_resume,
	51	.freeze = acpi_fan_suspend,
	52	.thaw = acpi_fan_resume,
	53	.restore = acpi_fan_resume,
	54	};
	55	#define FAN_PM_OPS_PTR (&acpi_fan_pm)
b108e0ea	56	#else
b9b8515f	57	#define FAN_PM_OPS_PTR NULL
90692404	58	#endif
62fcbdd9	59
9519a635 AL	60	struct acpi_fan_fps {
	61	u64 control;
	62	u64 trip_point;
	63	u64 speed;
	64	u64 noise_level;
	65	u64 power;
	66	};
	67
	68	struct acpi_fan_fif {
	69	u64 revision;
	70	u64 fine_grain_ctrl;
	71	u64 step_size;
	72	u64 low_speed_notification;
	73	};
	74
	75	struct acpi_fan {
	76	bool acpi4;
	77	struct acpi_fan_fif fif;
	78	struct acpi_fan_fps *fps;
	79	int fps_count;
	80	struct thermal_cooling_device *cdev;
	81	};
	82
19593a1f AL	83	static struct platform_driver acpi_fan_driver = {
	84	.probe = acpi_fan_probe,
	85	.remove = acpi_fan_remove,
	86	.driver = {
	87	.name = "acpi-fan",
	88	.acpi_match_table = fan_device_ids,
	89	.pm = FAN_PM_OPS_PTR,
	90	},
1da177e4 LT	91	};
1da177e4 LT	92
05a83d97	93	/* thermal cooling device callbacks */
6503e5df MG	94	static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
6503e5df MG	95	*state)
05a83d97	96	{
9519a635 AL	97	struct acpi_device *device = cdev->devdata;
	98	struct acpi_fan *fan = acpi_driver_data(device);
	99
	100	if (fan->acpi4)
	101	*state = fan->fps_count - 1;
	102	else
	103	*state = 1;
6503e5df	104	return 0;
05a83d97 ZR	105	}
05a83d97 ZR	106
9519a635 AL	107	static int fan_get_state_acpi4(struct acpi_device device, unsigned long state)
	108	{
	109	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	110	struct acpi_fan *fan = acpi_driver_data(device);
	111	union acpi_object *obj;
	112	acpi_status status;
	113	int control, i;
	114
	115	status = acpi_evaluate_object(device->handle, "_FST", NULL, &buffer);
	116	if (ACPI_FAILURE(status)) {
	117	dev_err(&device->dev, "Get fan state failed\n");
	118	return status;
	119	}
	120
	121	obj = buffer.pointer;
	122	if (!obj \|\| obj->type != ACPI_TYPE_PACKAGE \|\|
	123	obj->package.count != 3 \|\|
	124	obj->package.elements[1].type != ACPI_TYPE_INTEGER) {
	125	dev_err(&device->dev, "Invalid _FST data\n");
	126	status = -EINVAL;
	127	goto err;
	128	}
	129
	130	control = obj->package.elements[1].integer.value;
	131	for (i = 0; i < fan->fps_count; i++) {
	132	if (control == fan->fps[i].control)
	133	break;
	134	}
	135	if (i == fan->fps_count) {
	136	dev_dbg(&device->dev, "Invalid control value returned\n");
	137	status = -EINVAL;
	138	goto err;
	139	}
	140
	141	*state = i;
	142
	143	err:
	144	kfree(obj);
	145	return status;
	146	}
	147
	148	static int fan_get_state(struct acpi_device device, unsigned long state)
05a83d97	149	{
05a83d97	150	int result;
85eb9827	151	int acpi_state = ACPI_STATE_D0;
05a83d97	152
2bb3a2bf	153	result = acpi_device_update_power(device, &acpi_state);
05a83d97 ZR	154	if (result)
	155	return result;
	156
20dacb71 RW	157	*state = acpi_state == ACPI_STATE_D3_COLD
	158	\|\| acpi_state == ACPI_STATE_D3_HOT ?
	159	0 : (acpi_state == ACPI_STATE_D0 ? 1 : -1);
6503e5df	160	return 0;
05a83d97 ZR	161	}
05a83d97 ZR	162
9519a635 AL	163	static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
9519a635 AL	164	*state)
05a83d97 ZR	165	{
05a83d97 ZR	166	struct acpi_device *device = cdev->devdata;
9519a635	167	struct acpi_fan *fan = acpi_driver_data(device);
05a83d97	168
9519a635 AL	169	if (fan->acpi4)
	170	return fan_get_state_acpi4(device, state);
	171	else
	172	return fan_get_state(device, state);
	173	}
05a83d97	174
9519a635 AL	175	static int fan_set_state(struct acpi_device *device, unsigned long state)
	176	{
	177	if (state != 0 && state != 1)
05a83d97 ZR	178	return -EINVAL;
05a83d97 ZR	179
9519a635 AL	180	return acpi_device_set_power(device,
	181	state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
	182	}
05a83d97	183
9519a635 AL	184	static int fan_set_state_acpi4(struct acpi_device *device, unsigned long state)
	185	{
	186	struct acpi_fan *fan = acpi_driver_data(device);
	187	acpi_status status;
	188
	189	if (state >= fan->fps_count)
	190	return -EINVAL;
	191
	192	status = acpi_execute_simple_method(device->handle, "_FSL",
	193	fan->fps[state].control);
	194	if (ACPI_FAILURE(status)) {
	195	dev_dbg(&device->dev, "Failed to set state by _FSL\n");
	196	return status;
	197	}
	198
	199	return 0;
05a83d97 ZR	200	}
05a83d97 ZR	201
9519a635 AL	202	static int
	203	fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
	204	{
	205	struct acpi_device *device = cdev->devdata;
	206	struct acpi_fan *fan = acpi_driver_data(device);
	207
	208	if (fan->acpi4)
	209	return fan_set_state_acpi4(device, state);
	210	else
	211	return fan_set_state(device, state);
	212	}
	213
9c8b04be	214	static const struct thermal_cooling_device_ops fan_cooling_ops = {
05a83d97 ZR	215	.get_max_state = fan_get_max_state,
	216	.get_cur_state = fan_get_cur_state,
	217	.set_cur_state = fan_set_cur_state,
	218	};
	219
1da177e4	220	/* --------------------------------------------------------------------------
88989fd2 SM	221	* Driver Interface
	222	* --------------------------------------------------------------------------
	223	*/
1da177e4	224
9519a635	225	static bool acpi_fan_is_acpi4(struct acpi_device *device)
1da177e4	226	{
9519a635 AL	227	return acpi_has_method(device->handle, "_FIF") &&
	228	acpi_has_method(device->handle, "_FPS") &&
	229	acpi_has_method(device->handle, "_FSL") &&
	230	acpi_has_method(device->handle, "_FST");
	231	}
1da177e4	232
9519a635 AL	233	static int acpi_fan_get_fif(struct acpi_device *device)
	234	{
	235	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	236	struct acpi_fan *fan = acpi_driver_data(device);
	237	struct acpi_buffer format = { sizeof("NNNN"), "NNNN" };
	238	struct acpi_buffer fif = { sizeof(fan->fif), &fan->fif };
	239	union acpi_object *obj;
	240	acpi_status status;
	241
	242	status = acpi_evaluate_object(device->handle, "_FIF", NULL, &buffer);
	243	if (ACPI_FAILURE(status))
	244	return status;
	245
	246	obj = buffer.pointer;
	247	if (!obj \|\| obj->type != ACPI_TYPE_PACKAGE) {
	248	dev_err(&device->dev, "Invalid _FIF data\n");
	249	status = -EINVAL;
	250	goto err;
	251	}
1da177e4	252
9519a635 AL	253	status = acpi_extract_package(obj, &format, &fif);
	254	if (ACPI_FAILURE(status)) {
	255	dev_err(&device->dev, "Invalid _FIF element\n");
	256	status = -EINVAL;
	257	}
1da177e4	258
9519a635 AL	259	err:
	260	kfree(obj);
	261	return status;
	262	}
	263
	264	static int acpi_fan_speed_cmp(const void a, const void b)
	265	{
	266	const struct acpi_fan_fps *fps1 = a;
	267	const struct acpi_fan_fps *fps2 = b;
	268	return fps1->speed - fps2->speed;
	269	}
	270
	271	static int acpi_fan_get_fps(struct acpi_device *device)
	272	{
	273	struct acpi_fan *fan = acpi_driver_data(device);
	274	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	275	union acpi_object *obj;
	276	acpi_status status;
	277	int i;
	278
	279	status = acpi_evaluate_object(device->handle, "_FPS", NULL, &buffer);
	280	if (ACPI_FAILURE(status))
	281	return status;
	282
	283	obj = buffer.pointer;
	284	if (!obj \|\| obj->type != ACPI_TYPE_PACKAGE \|\| obj->package.count < 2) {
	285	dev_err(&device->dev, "Invalid _FPS data\n");
	286	status = -EINVAL;
	287	goto err;
	288	}
	289
	290	fan->fps_count = obj->package.count - 1; /* minus revision field */
	291	fan->fps = devm_kzalloc(&device->dev,
	292	fan->fps_count * sizeof(struct acpi_fan_fps),
	293	GFP_KERNEL);
	294	if (!fan->fps) {
	295	dev_err(&device->dev, "Not enough memory\n");
	296	status = -ENOMEM;
	297	goto err;
	298	}
	299	for (i = 0; i < fan->fps_count; i++) {
	300	struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
	301	struct acpi_buffer fps = { sizeof(fan->fps[i]), &fan->fps[i] };
	302	status = acpi_extract_package(&obj->package.elements[i + 1],
	303	&format, &fps);
	304	if (ACPI_FAILURE(status)) {
	305	dev_err(&device->dev, "Invalid _FPS element\n");
	306	break;
	307	}
	308	}
	309
	310	/* sort the state array according to fan speed in increase order */
	311	sort(fan->fps, fan->fps_count, sizeof(*fan->fps),
	312	acpi_fan_speed_cmp, NULL);
	313
	314	err:
	315	kfree(obj);
	316	return status;
	317	}
	318
19593a1f	319	static int acpi_fan_probe(struct platform_device *pdev)
1da177e4	320	{
4be44fcd	321	int result = 0;
05a83d97	322	struct thermal_cooling_device *cdev;
9519a635	323	struct acpi_fan *fan;
19593a1f	324	struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
bbb16fef	325	char *name;
1da177e4	326
9519a635 AL	327	fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
	328	if (!fan) {
	329	dev_err(&device->dev, "No memory for fan\n");
	330	return -ENOMEM;
	331	}
	332	device->driver_data = fan;
	333	platform_set_drvdata(pdev, fan);
	334
	335	if (acpi_fan_is_acpi4(device)) {
	336	if (acpi_fan_get_fif(device) \|\| acpi_fan_get_fps(device))
	337	goto end;
	338	fan->acpi4 = true;
	339	} else {
	340	result = acpi_device_update_power(device, NULL);
	341	if (result) {
	342	dev_err(&device->dev, "Setting initial power state\n");
	343	goto end;
	344	}
1da177e4 LT	345	}
1da177e4 LT	346
bbb16fef SP	347	if (!strncmp(pdev->name, "PNP0C0B", strlen("PNP0C0B")))
	348	name = "Fan";
	349	else
	350	name = acpi_device_bid(device);
	351
	352	cdev = thermal_cooling_device_register(name, device,
05a83d97	353	&fan_cooling_ops);
19b36780 TS	354	if (IS_ERR(cdev)) {
	355	result = PTR_ERR(cdev);
	356	goto end;
	357	}
9030062f	358
19593a1f	359	dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id);
9030062f	360
9519a635	361	fan->cdev = cdev;
19593a1f	362	result = sysfs_create_link(&pdev->dev.kobj,
9030062f JL	363	&cdev->device.kobj,
	364	"thermal_cooling");
	365	if (result)
8264fce6	366	dev_err(&pdev->dev, "Failed to create sysfs link 'thermal_cooling'\n");
9030062f JL	367
9030062f JL	368	result = sysfs_create_link(&cdev->device.kobj,
19593a1f	369	&pdev->dev.kobj,
9030062f JL	370	"device");
9030062f JL	371	if (result)
8264fce6	372	dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n");
1da177e4	373
568b6ad8	374	end:
d550d98d	375	return result;
1da177e4 LT	376	}
1da177e4 LT	377
19593a1f	378	static int acpi_fan_remove(struct platform_device *pdev)
1da177e4	379	{
9519a635	380	struct acpi_fan *fan = platform_get_drvdata(pdev);
1da177e4	381
19593a1f	382	sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling");
9519a635 AL	383	sysfs_remove_link(&fan->cdev->device.kobj, "device");
9519a635 AL	384	thermal_cooling_device_unregister(fan->cdev);
1da177e4	385
d550d98d	386	return 0;
1da177e4 LT	387	}
1da177e4 LT	388
90692404	389	#ifdef CONFIG_PM_SLEEP
62fcbdd9	390	static int acpi_fan_suspend(struct device *dev)
ec68373c	391	{
9519a635 AL	392	struct acpi_fan *fan = dev_get_drvdata(dev);
	393	if (fan->acpi4)
	394	return 0;
ec68373c	395
19593a1f	396	acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0);
ec68373c LB	397
	398	return AE_OK;
	399	}
	400
62fcbdd9	401	static int acpi_fan_resume(struct device *dev)
ec68373c	402	{
488a76c5	403	int result;
9519a635	404	struct acpi_fan *fan = dev_get_drvdata(dev);
ec68373c	405
9519a635 AL	406	if (fan->acpi4)
9519a635 AL	407	return 0;
ec68373c	408
19593a1f	409	result = acpi_device_update_power(ACPI_COMPANION(dev), NULL);
488a76c5	410	if (result)
88989fd2	411	dev_err(dev, "Error updating fan power state\n");
ec68373c LB	412
	413	return result;
	414	}
90692404	415	#endif
ec68373c	416
19593a1f	417	module_platform_driver(acpi_fan_driver);