[linux-2.6-block.git] / drivers / acpi / fan.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  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>
 */

#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 const 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++) {
		/*
		 * When Fine Grain Control is set, return the state
		 * corresponding to maximum fan->fps[i].control
		 * value compared to the current speed. Here the
		 * fan->fps[] is sorted array with increasing speed.
		 */
		if (fan->fif.fine_grain_ctrl && control < fan->fps[i].control) {
			i = (i > 0) ? i - 1 : 0;
			break;
		} else 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_kcalloc(&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, "Failed to set 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
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
	4	*
	5	* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
	6	* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
1da177e4 LT	7	*/
	8
	9	#include <linux/kernel.h>
	10	#include <linux/module.h>
	11	#include <linux/init.h>
	12	#include <linux/types.h>
88989fd2	13	#include <linux/uaccess.h>
05a83d97	14	#include <linux/thermal.h>
8b48463f	15	#include <linux/acpi.h>
19593a1f	16	#include <linux/platform_device.h>
9519a635	17	#include <linux/sort.h>
1da177e4	18
f52fd66d	19	MODULE_AUTHOR("Paul Diefenbaugh");
7cda93e0	20	MODULE_DESCRIPTION("ACPI Fan Driver");
1da177e4 LT	21	MODULE_LICENSE("GPL");
1da177e4 LT	22
19593a1f AL	23	static int acpi_fan_probe(struct platform_device *pdev);
19593a1f AL	24	static int acpi_fan_remove(struct platform_device *pdev);
1da177e4	25
1ba90e3a TR	26	static const struct acpi_device_id fan_device_ids[] = {
1ba90e3a TR	27	{"PNP0C0B", 0},
d806c6e9	28	{"INT3404", 0},
1ba90e3a TR	29	{"", 0},
	30	};
	31	MODULE_DEVICE_TABLE(acpi, fan_device_ids);
	32
90692404	33	#ifdef CONFIG_PM_SLEEP
62fcbdd9 RW	34	static int acpi_fan_suspend(struct device *dev);
62fcbdd9 RW	35	static int acpi_fan_resume(struct device *dev);
1d751584	36	static const struct dev_pm_ops acpi_fan_pm = {
b9b8515f AL	37	.resume = acpi_fan_resume,
	38	.freeze = acpi_fan_suspend,
	39	.thaw = acpi_fan_resume,
	40	.restore = acpi_fan_resume,
	41	};
	42	#define FAN_PM_OPS_PTR (&acpi_fan_pm)
b108e0ea	43	#else
b9b8515f	44	#define FAN_PM_OPS_PTR NULL
90692404	45	#endif
62fcbdd9	46
9519a635 AL	47	struct acpi_fan_fps {
	48	u64 control;
	49	u64 trip_point;
	50	u64 speed;
	51	u64 noise_level;
	52	u64 power;
	53	};
	54
	55	struct acpi_fan_fif {
	56	u64 revision;
	57	u64 fine_grain_ctrl;
	58	u64 step_size;
	59	u64 low_speed_notification;
	60	};
	61
	62	struct acpi_fan {
	63	bool acpi4;
	64	struct acpi_fan_fif fif;
	65	struct acpi_fan_fps *fps;
	66	int fps_count;
	67	struct thermal_cooling_device *cdev;
	68	};
	69
19593a1f AL	70	static struct platform_driver acpi_fan_driver = {
	71	.probe = acpi_fan_probe,
	72	.remove = acpi_fan_remove,
	73	.driver = {
	74	.name = "acpi-fan",
	75	.acpi_match_table = fan_device_ids,
	76	.pm = FAN_PM_OPS_PTR,
	77	},
1da177e4 LT	78	};
1da177e4 LT	79
05a83d97	80	/* thermal cooling device callbacks */
6503e5df MG	81	static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
6503e5df MG	82	*state)
05a83d97	83	{
9519a635 AL	84	struct acpi_device *device = cdev->devdata;
	85	struct acpi_fan *fan = acpi_driver_data(device);
	86
	87	if (fan->acpi4)
	88	*state = fan->fps_count - 1;
	89	else
	90	*state = 1;
6503e5df	91	return 0;
05a83d97 ZR	92	}
05a83d97 ZR	93
9519a635 AL	94	static int fan_get_state_acpi4(struct acpi_device device, unsigned long state)
	95	{
	96	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	97	struct acpi_fan *fan = acpi_driver_data(device);
	98	union acpi_object *obj;
	99	acpi_status status;
	100	int control, i;
	101
	102	status = acpi_evaluate_object(device->handle, "_FST", NULL, &buffer);
	103	if (ACPI_FAILURE(status)) {
	104	dev_err(&device->dev, "Get fan state failed\n");
	105	return status;
	106	}
	107
	108	obj = buffer.pointer;
	109	if (!obj \|\| obj->type != ACPI_TYPE_PACKAGE \|\|
	110	obj->package.count != 3 \|\|
	111	obj->package.elements[1].type != ACPI_TYPE_INTEGER) {
	112	dev_err(&device->dev, "Invalid _FST data\n");
	113	status = -EINVAL;
	114	goto err;
	115	}
	116
	117	control = obj->package.elements[1].integer.value;
	118	for (i = 0; i < fan->fps_count; i++) {
84baf172 SP	119	/*
	120	* When Fine Grain Control is set, return the state
	121	* corresponding to maximum fan->fps[i].control
	122	* value compared to the current speed. Here the
	123	* fan->fps[] is sorted array with increasing speed.
	124	*/
	125	if (fan->fif.fine_grain_ctrl && control < fan->fps[i].control) {
	126	i = (i > 0) ? i - 1 : 0;
9519a635	127	break;
84baf172 SP	128	} else if (control == fan->fps[i].control) {
	129	break;
	130	}
9519a635 AL	131	}
	132	if (i == fan->fps_count) {
	133	dev_dbg(&device->dev, "Invalid control value returned\n");
	134	status = -EINVAL;
	135	goto err;
	136	}
	137
	138	*state = i;
	139
	140	err:
	141	kfree(obj);
	142	return status;
	143	}
	144
	145	static int fan_get_state(struct acpi_device device, unsigned long state)
05a83d97	146	{
05a83d97	147	int result;
85eb9827	148	int acpi_state = ACPI_STATE_D0;
05a83d97	149
2bb3a2bf	150	result = acpi_device_update_power(device, &acpi_state);
05a83d97 ZR	151	if (result)
	152	return result;
	153
20dacb71 RW	154	*state = acpi_state == ACPI_STATE_D3_COLD
	155	\|\| acpi_state == ACPI_STATE_D3_HOT ?
	156	0 : (acpi_state == ACPI_STATE_D0 ? 1 : -1);
6503e5df	157	return 0;
05a83d97 ZR	158	}
05a83d97 ZR	159
9519a635 AL	160	static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
9519a635 AL	161	*state)
05a83d97 ZR	162	{
05a83d97 ZR	163	struct acpi_device *device = cdev->devdata;
9519a635	164	struct acpi_fan *fan = acpi_driver_data(device);
05a83d97	165
9519a635 AL	166	if (fan->acpi4)
	167	return fan_get_state_acpi4(device, state);
	168	else
	169	return fan_get_state(device, state);
	170	}
05a83d97	171
9519a635 AL	172	static int fan_set_state(struct acpi_device *device, unsigned long state)
	173	{
	174	if (state != 0 && state != 1)
05a83d97 ZR	175	return -EINVAL;
05a83d97 ZR	176
9519a635 AL	177	return acpi_device_set_power(device,
	178	state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
	179	}
05a83d97	180
9519a635 AL	181	static int fan_set_state_acpi4(struct acpi_device *device, unsigned long state)
	182	{
	183	struct acpi_fan *fan = acpi_driver_data(device);
	184	acpi_status status;
	185
	186	if (state >= fan->fps_count)
	187	return -EINVAL;
	188
	189	status = acpi_execute_simple_method(device->handle, "_FSL",
	190	fan->fps[state].control);
	191	if (ACPI_FAILURE(status)) {
	192	dev_dbg(&device->dev, "Failed to set state by _FSL\n");
	193	return status;
	194	}
	195
	196	return 0;
05a83d97 ZR	197	}
05a83d97 ZR	198
9519a635 AL	199	static int
	200	fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
	201	{
	202	struct acpi_device *device = cdev->devdata;
	203	struct acpi_fan *fan = acpi_driver_data(device);
	204
	205	if (fan->acpi4)
	206	return fan_set_state_acpi4(device, state);
	207	else
	208	return fan_set_state(device, state);
447a5647	209	}
9519a635	210
9c8b04be	211	static const struct thermal_cooling_device_ops fan_cooling_ops = {
05a83d97 ZR	212	.get_max_state = fan_get_max_state,
	213	.get_cur_state = fan_get_cur_state,
	214	.set_cur_state = fan_set_cur_state,
	215	};
	216
1da177e4	217	/* --------------------------------------------------------------------------
88989fd2 SM	218	* Driver Interface
	219	* --------------------------------------------------------------------------
	220	*/
1da177e4	221
9519a635	222	static bool acpi_fan_is_acpi4(struct acpi_device *device)
1da177e4	223	{
9519a635 AL	224	return acpi_has_method(device->handle, "_FIF") &&
	225	acpi_has_method(device->handle, "_FPS") &&
	226	acpi_has_method(device->handle, "_FSL") &&
	227	acpi_has_method(device->handle, "_FST");
	228	}
1da177e4	229
9519a635 AL	230	static int acpi_fan_get_fif(struct acpi_device *device)
	231	{
	232	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	233	struct acpi_fan *fan = acpi_driver_data(device);
	234	struct acpi_buffer format = { sizeof("NNNN"), "NNNN" };
	235	struct acpi_buffer fif = { sizeof(fan->fif), &fan->fif };
	236	union acpi_object *obj;
	237	acpi_status status;
	238
	239	status = acpi_evaluate_object(device->handle, "_FIF", NULL, &buffer);
	240	if (ACPI_FAILURE(status))
	241	return status;
	242
	243	obj = buffer.pointer;
	244	if (!obj \|\| obj->type != ACPI_TYPE_PACKAGE) {
	245	dev_err(&device->dev, "Invalid _FIF data\n");
	246	status = -EINVAL;
	247	goto err;
	248	}
1da177e4	249
9519a635 AL	250	status = acpi_extract_package(obj, &format, &fif);
	251	if (ACPI_FAILURE(status)) {
	252	dev_err(&device->dev, "Invalid _FIF element\n");
	253	status = -EINVAL;
	254	}
1da177e4	255
9519a635 AL	256	err:
	257	kfree(obj);
	258	return status;
	259	}
	260
	261	static int acpi_fan_speed_cmp(const void a, const void b)
	262	{
	263	const struct acpi_fan_fps *fps1 = a;
	264	const struct acpi_fan_fps *fps2 = b;
	265	return fps1->speed - fps2->speed;
	266	}
	267
	268	static int acpi_fan_get_fps(struct acpi_device *device)
	269	{
	270	struct acpi_fan *fan = acpi_driver_data(device);
	271	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	272	union acpi_object *obj;
	273	acpi_status status;
	274	int i;
	275
	276	status = acpi_evaluate_object(device->handle, "_FPS", NULL, &buffer);
	277	if (ACPI_FAILURE(status))
	278	return status;
	279
	280	obj = buffer.pointer;
	281	if (!obj \|\| obj->type != ACPI_TYPE_PACKAGE \|\| obj->package.count < 2) {
	282	dev_err(&device->dev, "Invalid _FPS data\n");
	283	status = -EINVAL;
	284	goto err;
	285	}
	286
	287	fan->fps_count = obj->package.count - 1; /* minus revision field */
a86854d0 KC	288	fan->fps = devm_kcalloc(&device->dev,
a86854d0 KC	289	fan->fps_count, sizeof(struct acpi_fan_fps),
9519a635 AL	290	GFP_KERNEL);
	291	if (!fan->fps) {
	292	dev_err(&device->dev, "Not enough memory\n");
	293	status = -ENOMEM;
	294	goto err;
	295	}
	296	for (i = 0; i < fan->fps_count; i++) {
	297	struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
	298	struct acpi_buffer fps = { sizeof(fan->fps[i]), &fan->fps[i] };
	299	status = acpi_extract_package(&obj->package.elements[i + 1],
	300	&format, &fps);
	301	if (ACPI_FAILURE(status)) {
	302	dev_err(&device->dev, "Invalid _FPS element\n");
	303	break;
	304	}
	305	}
	306
	307	/* sort the state array according to fan speed in increase order */
	308	sort(fan->fps, fan->fps_count, sizeof(*fan->fps),
	309	acpi_fan_speed_cmp, NULL);
	310
	311	err:
	312	kfree(obj);
	313	return status;
	314	}
	315
19593a1f	316	static int acpi_fan_probe(struct platform_device *pdev)
1da177e4	317	{
4be44fcd	318	int result = 0;
05a83d97	319	struct thermal_cooling_device *cdev;
9519a635	320	struct acpi_fan *fan;
19593a1f	321	struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
bbb16fef	322	char *name;
1da177e4	323
9519a635 AL	324	fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
	325	if (!fan) {
	326	dev_err(&device->dev, "No memory for fan\n");
	327	return -ENOMEM;
	328	}
	329	device->driver_data = fan;
	330	platform_set_drvdata(pdev, fan);
	331
	332	if (acpi_fan_is_acpi4(device)) {
	333	if (acpi_fan_get_fif(device) \|\| acpi_fan_get_fps(device))
	334	goto end;
	335	fan->acpi4 = true;
	336	} else {
	337	result = acpi_device_update_power(device, NULL);
	338	if (result) {
f9727999	339	dev_err(&device->dev, "Failed to set initial power state\n");
9519a635 AL	340	goto end;
9519a635 AL	341	}
1da177e4 LT	342	}
1da177e4 LT	343
bbb16fef SP	344	if (!strncmp(pdev->name, "PNP0C0B", strlen("PNP0C0B")))
	345	name = "Fan";
	346	else
	347	name = acpi_device_bid(device);
	348
	349	cdev = thermal_cooling_device_register(name, device,
05a83d97	350	&fan_cooling_ops);
19b36780 TS	351	if (IS_ERR(cdev)) {
	352	result = PTR_ERR(cdev);
	353	goto end;
	354	}
9030062f	355
19593a1f	356	dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id);
9030062f	357
9519a635	358	fan->cdev = cdev;
19593a1f	359	result = sysfs_create_link(&pdev->dev.kobj,
9030062f JL	360	&cdev->device.kobj,
	361	"thermal_cooling");
	362	if (result)
8264fce6	363	dev_err(&pdev->dev, "Failed to create sysfs link 'thermal_cooling'\n");
9030062f JL	364
9030062f JL	365	result = sysfs_create_link(&cdev->device.kobj,
19593a1f	366	&pdev->dev.kobj,
9030062f JL	367	"device");
9030062f JL	368	if (result)
8264fce6	369	dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n");
1da177e4	370
568b6ad8	371	end:
d550d98d	372	return result;
1da177e4 LT	373	}
1da177e4 LT	374
19593a1f	375	static int acpi_fan_remove(struct platform_device *pdev)
1da177e4	376	{
9519a635	377	struct acpi_fan *fan = platform_get_drvdata(pdev);
1da177e4	378
19593a1f	379	sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling");
9519a635 AL	380	sysfs_remove_link(&fan->cdev->device.kobj, "device");
9519a635 AL	381	thermal_cooling_device_unregister(fan->cdev);
1da177e4	382
d550d98d	383	return 0;
1da177e4 LT	384	}
1da177e4 LT	385
90692404	386	#ifdef CONFIG_PM_SLEEP
62fcbdd9	387	static int acpi_fan_suspend(struct device *dev)
ec68373c	388	{
9519a635 AL	389	struct acpi_fan *fan = dev_get_drvdata(dev);
	390	if (fan->acpi4)
	391	return 0;
ec68373c	392
19593a1f	393	acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0);
ec68373c LB	394
	395	return AE_OK;
	396	}
	397
62fcbdd9	398	static int acpi_fan_resume(struct device *dev)
ec68373c	399	{
488a76c5	400	int result;
9519a635	401	struct acpi_fan *fan = dev_get_drvdata(dev);
ec68373c	402
9519a635 AL	403	if (fan->acpi4)
9519a635 AL	404	return 0;
ec68373c	405
19593a1f	406	result = acpi_device_update_power(ACPI_COMPANION(dev), NULL);
488a76c5	407	if (result)
88989fd2	408	dev_err(dev, "Error updating fan power state\n");
ec68373c LB	409
	410	return result;
	411	}
90692404	412	#endif
ec68373c	413
19593a1f	414	module_platform_driver(acpi_fan_driver);