[linux-2.6-block.git] / drivers / thermal / int3403_thermal.c

/*
 * ACPI INT3403 thermal driver
 * Copyright (c) 2013, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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/acpi.h>
#include <linux/thermal.h>

#define INT3403_TYPE_SENSOR		0x03
#define INT3403_PERF_CHANGED_EVENT	0x80
#define INT3403_THERMAL_EVENT		0x90

#define DECI_KELVIN_TO_MILLI_CELSIUS(t, off) (((t) - (off)) * 100)
#define KELVIN_OFFSET	2732
#define MILLI_CELSIUS_TO_DECI_KELVIN(t, off) (((t) / 100) + (off))

#define ACPI_INT3403_CLASS		"int3403"
#define ACPI_INT3403_FILE_STATE		"state"

struct int3403_sensor {
	struct thermal_zone_device *tzone;
	unsigned long *thresholds;
	unsigned long	crit_temp;
	int		crit_trip_id;
	unsigned long	psv_temp;
	int		psv_trip_id;
};

static int sys_get_curr_temp(struct thermal_zone_device *tzone,
				unsigned long *temp)
{
	struct acpi_device *device = tzone->devdata;
	unsigned long long tmp;
	acpi_status status;

	status = acpi_evaluate_integer(device->handle, "_TMP", NULL, &tmp);
	if (ACPI_FAILURE(status))
		return -EIO;

	*temp = DECI_KELVIN_TO_MILLI_CELSIUS(tmp, KELVIN_OFFSET);

	return 0;
}

static int sys_get_trip_hyst(struct thermal_zone_device *tzone,
		int trip, unsigned long *temp)
{
	struct acpi_device *device = tzone->devdata;
	unsigned long long hyst;
	acpi_status status;

	status = acpi_evaluate_integer(device->handle, "GTSH", NULL, &hyst);
	if (ACPI_FAILURE(status))
		return -EIO;

	/*
	 * Thermal hysteresis represents a temperature difference.
	 * Kelvin and Celsius have same degree size. So the
	 * conversion here between tenths of degree Kelvin unit
	 * and Milli-Celsius unit is just to multiply 100.
	 */
	*temp = hyst * 100;

	return 0;
}

static int sys_get_trip_temp(struct thermal_zone_device *tzone,
		int trip, unsigned long *temp)
{
	struct acpi_device *device = tzone->devdata;
	struct int3403_sensor *obj = acpi_driver_data(device);

	if (trip == obj->crit_trip_id)
		*temp = obj->crit_temp;
	else if (trip == obj->psv_trip_id)
		*temp = obj->psv_temp;
	else {
		/*
		 * get_trip_temp is a mandatory callback but
		 * PATx method doesn't return any value, so return
		 * cached value, which was last set from user space.
		 */
		*temp = obj->thresholds[trip];
	}

	return 0;
}

static int sys_get_trip_type(struct thermal_zone_device *thermal,
		int trip, enum thermal_trip_type *type)
{
	struct acpi_device *device = thermal->devdata;
	struct int3403_sensor *obj = acpi_driver_data(device);

	/* Mandatory callback, may not mean much here */
	if (trip == obj->crit_trip_id)
		*type = THERMAL_TRIP_CRITICAL;
	else
		*type = THERMAL_TRIP_PASSIVE;

	return 0;
}

int sys_set_trip_temp(struct thermal_zone_device *tzone, int trip,
							unsigned long temp)
{
	struct acpi_device *device = tzone->devdata;
	acpi_status status;
	char name[10];
	int ret = 0;
	struct int3403_sensor *obj = acpi_driver_data(device);

	snprintf(name, sizeof(name), "PAT%d", trip);
	if (acpi_has_method(device->handle, name)) {
		status = acpi_execute_simple_method(device->handle, name,
				MILLI_CELSIUS_TO_DECI_KELVIN(temp,
							KELVIN_OFFSET));
		if (ACPI_FAILURE(status))
			ret = -EIO;
		else
			obj->thresholds[trip] = temp;
	} else {
		ret = -EIO;
		dev_err(&device->dev, "sys_set_trip_temp: method not found\n");
	}

	return ret;
}

static struct thermal_zone_device_ops tzone_ops = {
	.get_temp = sys_get_curr_temp,
	.get_trip_temp = sys_get_trip_temp,
	.get_trip_type = sys_get_trip_type,
	.set_trip_temp = sys_set_trip_temp,
	.get_trip_hyst =  sys_get_trip_hyst,
};

static void acpi_thermal_notify(struct acpi_device *device, u32 event)
{
	struct int3403_sensor *obj;

	if (!device)
		return;

	obj = acpi_driver_data(device);
	if (!obj)
		return;

	switch (event) {
	case INT3403_PERF_CHANGED_EVENT:
		break;
	case INT3403_THERMAL_EVENT:
		thermal_zone_device_update(obj->tzone);
		break;
	default:
		dev_err(&device->dev, "Unsupported event [0x%x]\n", event);
		break;
	}
}

static int sys_get_trip_crt(struct acpi_device *device, unsigned long *temp)
{
	unsigned long long crt;
	acpi_status status;

	status = acpi_evaluate_integer(device->handle, "_CRT", NULL, &crt);
	if (ACPI_FAILURE(status))
		return -EIO;

	*temp = DECI_KELVIN_TO_MILLI_CELSIUS(crt, KELVIN_OFFSET);

	return 0;
}

static int sys_get_trip_psv(struct acpi_device *device, unsigned long *temp)
{
	unsigned long long psv;
	acpi_status status;

	status = acpi_evaluate_integer(device->handle, "_PSV", NULL, &psv);
	if (ACPI_FAILURE(status))
		return -EIO;

	*temp = DECI_KELVIN_TO_MILLI_CELSIUS(psv, KELVIN_OFFSET);

	return 0;
}

static int acpi_int3403_add(struct acpi_device *device)
{
	int result = 0;
	unsigned long long ptyp;
	acpi_status status;
	struct int3403_sensor *obj;
	unsigned long long trip_cnt;
	int trip_mask = 0;

	if (!device)
		return -EINVAL;

	status = acpi_evaluate_integer(device->handle, "PTYP", NULL, &ptyp);
	if (ACPI_FAILURE(status))
		return -EINVAL;

	if (ptyp != INT3403_TYPE_SENSOR)
		return -EINVAL;

	obj = devm_kzalloc(&device->dev, sizeof(*obj), GFP_KERNEL);
	if (!obj)
		return -ENOMEM;

	device->driver_data = obj;

	status = acpi_evaluate_integer(device->handle, "PATC", NULL,
						&trip_cnt);
	if (ACPI_FAILURE(status))
		trip_cnt = 0;

	if (trip_cnt) {
		/* We have to cache, thresholds can't be readback */
		obj->thresholds = devm_kzalloc(&device->dev,
					sizeof(*obj->thresholds) * trip_cnt,
					GFP_KERNEL);
		if (!obj->thresholds)
			return -ENOMEM;
		trip_mask = BIT(trip_cnt) - 1;
	}

	obj->psv_trip_id = -1;
	if (!sys_get_trip_psv(device, &obj->psv_temp))
		obj->psv_trip_id = trip_cnt++;

	obj->crit_trip_id = -1;
	if (!sys_get_trip_crt(device, &obj->crit_temp))
		obj->crit_trip_id = trip_cnt++;

	obj->tzone = thermal_zone_device_register(acpi_device_bid(device),
				trip_cnt, trip_mask, device, &tzone_ops,
				NULL, 0, 0);
	if (IS_ERR(obj->tzone)) {
		result = PTR_ERR(obj->tzone);
		return result;
	}

	strcpy(acpi_device_name(device), "INT3403");
	strcpy(acpi_device_class(device), ACPI_INT3403_CLASS);

	return 0;
}

static int acpi_int3403_remove(struct acpi_device *device)
{
	struct int3403_sensor *obj;

	obj = acpi_driver_data(device);
	thermal_zone_device_unregister(obj->tzone);

	return 0;
}

ACPI_MODULE_NAME("int3403");
static const struct acpi_device_id int3403_device_ids[] = {
	{"INT3403", 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, int3403_device_ids);

static struct acpi_driver acpi_int3403_driver = {
	.name = "INT3403",
	.class = ACPI_INT3403_CLASS,
	.ids = int3403_device_ids,
	.ops = {
		.add = acpi_int3403_add,
		.remove = acpi_int3403_remove,
		.notify = acpi_thermal_notify,
		},
};

module_acpi_driver(acpi_int3403_driver);

MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ACPI INT3403 thermal driver");
Commit	Line	Data
925c36bb SP	1	/*
	2	* ACPI INT3403 thermal driver
	3	* Copyright (c) 2013, Intel Corporation.
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms and conditions of the GNU General Public License,
	7	* version 2, as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*/
	14
	15	#include <linux/kernel.h>
	16	#include <linux/module.h>
	17	#include <linux/init.h>
	18	#include <linux/types.h>
	19	#include <linux/acpi.h>
	20	#include <linux/thermal.h>
	21
	22	#define INT3403_TYPE_SENSOR 0x03
	23	#define INT3403_PERF_CHANGED_EVENT 0x80
	24	#define INT3403_THERMAL_EVENT 0x90
	25
	26	#define DECI_KELVIN_TO_MILLI_CELSIUS(t, off) (((t) - (off)) * 100)
	27	#define KELVIN_OFFSET 2732
	28	#define MILLI_CELSIUS_TO_DECI_KELVIN(t, off) (((t) / 100) + (off))
	29
	30	#define ACPI_INT3403_CLASS "int3403"
	31	#define ACPI_INT3403_FILE_STATE "state"
	32
	33	struct int3403_sensor {
	34	struct thermal_zone_device *tzone;
	35	unsigned long *thresholds;
5fcdeb20 SP	36	unsigned long crit_temp;
	37	int crit_trip_id;
	38	unsigned long psv_temp;
	39	int psv_trip_id;
925c36bb SP	40	};
	41
	42	static int sys_get_curr_temp(struct thermal_zone_device *tzone,
	43	unsigned long *temp)
	44	{
	45	struct acpi_device *device = tzone->devdata;
	46	unsigned long long tmp;
	47	acpi_status status;
	48
	49	status = acpi_evaluate_integer(device->handle, "_TMP", NULL, &tmp);
	50	if (ACPI_FAILURE(status))
	51	return -EIO;
	52
	53	*temp = DECI_KELVIN_TO_MILLI_CELSIUS(tmp, KELVIN_OFFSET);
	54
	55	return 0;
	56	}
	57
	58	static int sys_get_trip_hyst(struct thermal_zone_device *tzone,
	59	int trip, unsigned long *temp)
	60	{
	61	struct acpi_device *device = tzone->devdata;
	62	unsigned long long hyst;
	63	acpi_status status;
	64
	65	status = acpi_evaluate_integer(device->handle, "GTSH", NULL, &hyst);
	66	if (ACPI_FAILURE(status))
	67	return -EIO;
	68
ced22843 T	69	/*
	70	* Thermal hysteresis represents a temperature difference.
	71	* Kelvin and Celsius have same degree size. So the
	72	* conversion here between tenths of degree Kelvin unit
	73	* and Milli-Celsius unit is just to multiply 100.
	74	*/
	75	temp = hyst 100;
925c36bb SP	76
	77	return 0;
	78	}
	79
	80	static int sys_get_trip_temp(struct thermal_zone_device *tzone,
	81	int trip, unsigned long *temp)
	82	{
	83	struct acpi_device *device = tzone->devdata;
	84	struct int3403_sensor *obj = acpi_driver_data(device);
	85
5fcdeb20 SP	86	if (trip == obj->crit_trip_id)
	87	*temp = obj->crit_temp;
	88	else if (trip == obj->psv_trip_id)
	89	*temp = obj->psv_temp;
	90	else {
	91	/*
	92	* get_trip_temp is a mandatory callback but
	93	* PATx method doesn't return any value, so return
	94	* cached value, which was last set from user space.
	95	*/
	96	*temp = obj->thresholds[trip];
	97	}
925c36bb SP	98
	99	return 0;
	100	}
	101
	102	static int sys_get_trip_type(struct thermal_zone_device *thermal,
	103	int trip, enum thermal_trip_type *type)
	104	{
5fcdeb20 SP	105	struct acpi_device *device = thermal->devdata;
	106	struct int3403_sensor *obj = acpi_driver_data(device);
	107
925c36bb	108	/* Mandatory callback, may not mean much here */
5fcdeb20 SP	109	if (trip == obj->crit_trip_id)
	110	*type = THERMAL_TRIP_CRITICAL;
	111	else
	112	*type = THERMAL_TRIP_PASSIVE;
925c36bb SP	113
	114	return 0;
	115	}
	116
	117	int sys_set_trip_temp(struct thermal_zone_device *tzone, int trip,
	118	unsigned long temp)
	119	{
	120	struct acpi_device *device = tzone->devdata;
	121	acpi_status status;
	122	char name[10];
	123	int ret = 0;
	124	struct int3403_sensor *obj = acpi_driver_data(device);
	125
	126	snprintf(name, sizeof(name), "PAT%d", trip);
	127	if (acpi_has_method(device->handle, name)) {
	128	status = acpi_execute_simple_method(device->handle, name,
	129	MILLI_CELSIUS_TO_DECI_KELVIN(temp,
	130	KELVIN_OFFSET));
	131	if (ACPI_FAILURE(status))
	132	ret = -EIO;
	133	else
	134	obj->thresholds[trip] = temp;
	135	} else {
	136	ret = -EIO;
	137	dev_err(&device->dev, "sys_set_trip_temp: method not found\n");
	138	}
	139
	140	return ret;
	141	}
	142
	143	static struct thermal_zone_device_ops tzone_ops = {
	144	.get_temp = sys_get_curr_temp,
	145	.get_trip_temp = sys_get_trip_temp,
	146	.get_trip_type = sys_get_trip_type,
	147	.set_trip_temp = sys_set_trip_temp,
	148	.get_trip_hyst = sys_get_trip_hyst,
	149	};
	150
	151	static void acpi_thermal_notify(struct acpi_device *device, u32 event)
	152	{
	153	struct int3403_sensor *obj;
	154
	155	if (!device)
	156	return;
	157
	158	obj = acpi_driver_data(device);
	159	if (!obj)
	160	return;
	161
	162	switch (event) {
	163	case INT3403_PERF_CHANGED_EVENT:
	164	break;
	165	case INT3403_THERMAL_EVENT:
	166	thermal_zone_device_update(obj->tzone);
	167	break;
	168	default:
	169	dev_err(&device->dev, "Unsupported event [0x%x]\n", event);
	170	break;
	171	}
	172	}
	173
5fcdeb20 SP	174	static int sys_get_trip_crt(struct acpi_device device, unsigned long temp)
	175	{
	176	unsigned long long crt;
	177	acpi_status status;
	178
	179	status = acpi_evaluate_integer(device->handle, "_CRT", NULL, &crt);
	180	if (ACPI_FAILURE(status))
	181	return -EIO;
	182
	183	*temp = DECI_KELVIN_TO_MILLI_CELSIUS(crt, KELVIN_OFFSET);
	184
	185	return 0;
	186	}
	187
	188	static int sys_get_trip_psv(struct acpi_device device, unsigned long temp)
	189	{
	190	unsigned long long psv;
	191	acpi_status status;
	192
	193	status = acpi_evaluate_integer(device->handle, "_PSV", NULL, &psv);
	194	if (ACPI_FAILURE(status))
	195	return -EIO;
	196
	197	*temp = DECI_KELVIN_TO_MILLI_CELSIUS(psv, KELVIN_OFFSET);
	198
	199	return 0;
	200	}
	201
925c36bb SP	202	static int acpi_int3403_add(struct acpi_device *device)
	203	{
	204	int result = 0;
	205	unsigned long long ptyp;
	206	acpi_status status;
	207	struct int3403_sensor *obj;
	208	unsigned long long trip_cnt;
	209	int trip_mask = 0;
	210
	211	if (!device)
	212	return -EINVAL;
	213
	214	status = acpi_evaluate_integer(device->handle, "PTYP", NULL, &ptyp);
	215	if (ACPI_FAILURE(status))
	216	return -EINVAL;
	217
	218	if (ptyp != INT3403_TYPE_SENSOR)
	219	return -EINVAL;
	220
	221	obj = devm_kzalloc(&device->dev, sizeof(*obj), GFP_KERNEL);
	222	if (!obj)
	223	return -ENOMEM;
	224
	225	device->driver_data = obj;
	226
	227	status = acpi_evaluate_integer(device->handle, "PATC", NULL,
	228	&trip_cnt);
	229	if (ACPI_FAILURE(status))
	230	trip_cnt = 0;
	231
	232	if (trip_cnt) {
	233	/* We have to cache, thresholds can't be readback */
	234	obj->thresholds = devm_kzalloc(&device->dev,
	235	sizeof(obj->thresholds) trip_cnt,
	236	GFP_KERNEL);
	237	if (!obj->thresholds)
	238	return -ENOMEM;
	239	trip_mask = BIT(trip_cnt) - 1;
	240	}
5fcdeb20 SP	241
	242	obj->psv_trip_id = -1;
	243	if (!sys_get_trip_psv(device, &obj->psv_temp))
	244	obj->psv_trip_id = trip_cnt++;
	245
	246	obj->crit_trip_id = -1;
	247	if (!sys_get_trip_crt(device, &obj->crit_temp))
	248	obj->crit_trip_id = trip_cnt++;
	249
925c36bb SP	250	obj->tzone = thermal_zone_device_register(acpi_device_bid(device),
	251	trip_cnt, trip_mask, device, &tzone_ops,
	252	NULL, 0, 0);
	253	if (IS_ERR(obj->tzone)) {
	254	result = PTR_ERR(obj->tzone);
	255	return result;
	256	}
	257
	258	strcpy(acpi_device_name(device), "INT3403");
	259	strcpy(acpi_device_class(device), ACPI_INT3403_CLASS);
	260
	261	return 0;
	262	}
	263
	264	static int acpi_int3403_remove(struct acpi_device *device)
	265	{
	266	struct int3403_sensor *obj;
	267
	268	obj = acpi_driver_data(device);
	269	thermal_zone_device_unregister(obj->tzone);
	270
	271	return 0;
	272	}
	273
	274	ACPI_MODULE_NAME("int3403");
	275	static const struct acpi_device_id int3403_device_ids[] = {
	276	{"INT3403", 0},
	277	{"", 0},
	278	};
	279	MODULE_DEVICE_TABLE(acpi, int3403_device_ids);
	280
	281	static struct acpi_driver acpi_int3403_driver = {
	282	.name = "INT3403",
	283	.class = ACPI_INT3403_CLASS,
	284	.ids = int3403_device_ids,
	285	.ops = {
	286	.add = acpi_int3403_add,
	287	.remove = acpi_int3403_remove,
	288	.notify = acpi_thermal_notify,
	289	},
	290	};
	291
	292	module_acpi_driver(acpi_int3403_driver);
	293
	294	MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
	295	MODULE_LICENSE("GPL v2");
	296	MODULE_DESCRIPTION("ACPI INT3403 thermal driver");