[deliverable/linux.git] / drivers / staging / omap-thermal / omap-thermal-common.c

/*
 * OMAP thermal driver interface
 *
 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
 * Contact:
 *   Eduardo Valentin <eduardo.valentin@ti.com>
 *
 * 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 published 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., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/workqueue.h>
#include <linux/thermal.h>
#include <linux/cpufreq.h>
#include <linux/cpu_cooling.h>

#include "omap-thermal.h"
#include "omap-bandgap.h"

/* common data structures */
struct omap_thermal_data {
	struct thermal_zone_device *omap_thermal;
	struct thermal_cooling_device *cool_dev;
	struct omap_bandgap *bg_ptr;
	enum thermal_device_mode mode;
	struct work_struct thermal_wq;
	int sensor_id;
};

static void omap_thermal_work(struct work_struct *work)
{
	struct omap_thermal_data *data = container_of(work,
					struct omap_thermal_data, thermal_wq);

	thermal_zone_device_update(data->omap_thermal);

	dev_dbg(&data->omap_thermal->device, "updated thermal zone %s\n",
		data->omap_thermal->type);
}

/**
 * omap_thermal_hotspot_temperature - returns sensor extrapolated temperature
 * @t:	omap sensor temperature
 * @s:	omap sensor slope value
 * @c:	omap sensor const value
 */
static inline int omap_thermal_hotspot_temperature(int t, int s, int c)
{
	int delta = t * s / 1000 + c;

	if (delta < 0)
		delta = 0;

	return t + delta;
}

/* thermal zone ops */
/* Get temperature callback function for thermal zone*/
static inline int omap_thermal_get_temp(struct thermal_zone_device *thermal,
					 unsigned long *temp)
{
	struct omap_thermal_data *data = thermal->devdata;
	struct omap_bandgap *bg_ptr = data->bg_ptr;
	struct omap_temp_sensor *s = &bg_ptr->conf->sensors[data->sensor_id];
	int ret, tmp, pcb_temp, slope, constant;

	ret = omap_bandgap_read_temperature(bg_ptr, data->sensor_id, &tmp);
	if (ret)
		return ret;

	pcb_temp = 0;
	/* TODO: Introduce pcb temperature lookup */
	/* In case pcb zone is available, use the extrapolation rule with it */
	if (pcb_temp) {
		tmp -= pcb_temp;
		slope = s->slope_pcb;
		constant = s->constant_pcb;
	} else {
		slope = s->slope;
		constant = s->constant;
	}
	*temp = omap_thermal_hotspot_temperature(tmp, slope, constant);

	return ret;
}

/* Bind callback functions for thermal zone */
static int omap_thermal_bind(struct thermal_zone_device *thermal,
			      struct thermal_cooling_device *cdev)
{
	struct omap_thermal_data *data = thermal->devdata;
	int max, id;

	if (IS_ERR_OR_NULL(data))
		return -ENODEV;

	/* check if this is the cooling device we registered */
	if (data->cool_dev != cdev)
		return 0;

	id = data->sensor_id;
	max = data->bg_ptr->conf->sensors[id].cooling_data.freq_clip_count;

	/* TODO: bind with min and max states */
	/* Simple thing, two trips, one passive another critical */
	return thermal_zone_bind_cooling_device(thermal, 0, cdev);
}

/* Unbind callback functions for thermal zone */
static int omap_thermal_unbind(struct thermal_zone_device *thermal,
				struct thermal_cooling_device *cdev)
{
	struct omap_thermal_data *data = thermal->devdata;

	if (IS_ERR_OR_NULL(data))
		return -ENODEV;

	/* check if this is the cooling device we registered */
	if (data->cool_dev != cdev)
		return 0;

	/* Simple thing, two trips, one passive another critical */
	return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
}

/* Get mode callback functions for thermal zone */
static int omap_thermal_get_mode(struct thermal_zone_device *thermal,
				  enum thermal_device_mode *mode)
{
	struct omap_thermal_data *data = thermal->devdata;

	if (data)
		*mode = data->mode;

	return 0;
}

/* Set mode callback functions for thermal zone */
static int omap_thermal_set_mode(struct thermal_zone_device *thermal,
				  enum thermal_device_mode mode)
{
	struct omap_thermal_data *data = thermal->devdata;

	if (!data->omap_thermal) {
		dev_notice(&thermal->device, "thermal zone not registered\n");
		return 0;
	}

	mutex_lock(&data->omap_thermal->lock);

	if (mode == THERMAL_DEVICE_ENABLED)
		data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
	else
		data->omap_thermal->polling_delay = 0;

	mutex_unlock(&data->omap_thermal->lock);

	data->mode = mode;
	thermal_zone_device_update(data->omap_thermal);
	dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
		data->omap_thermal->polling_delay);

	return 0;
}

/* Get trip type callback functions for thermal zone */
static int omap_thermal_get_trip_type(struct thermal_zone_device *thermal,
				       int trip, enum thermal_trip_type *type)
{
	if (!omap_thermal_is_valid_trip(trip))
		return -EINVAL;

	if (trip + 1 == OMAP_TRIP_NUMBER)
		*type = THERMAL_TRIP_CRITICAL;
	else
		*type = THERMAL_TRIP_PASSIVE;

	return 0;
}

/* Get trip temperature callback functions for thermal zone */
static int omap_thermal_get_trip_temp(struct thermal_zone_device *thermal,
				       int trip, unsigned long *temp)
{
	if (!omap_thermal_is_valid_trip(trip))
		return -EINVAL;

	*temp = omap_thermal_get_trip_value(trip);

	return 0;
}

/* Get critical temperature callback functions for thermal zone */
static int omap_thermal_get_crit_temp(struct thermal_zone_device *thermal,
				       unsigned long *temp)
{
	/* shutdown zone */
	return omap_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
}

static struct thermal_zone_device_ops omap_thermal_ops = {
	.get_temp = omap_thermal_get_temp,
	/* TODO: add .get_trend */
	.bind = omap_thermal_bind,
	.unbind = omap_thermal_unbind,
	.get_mode = omap_thermal_get_mode,
	.set_mode = omap_thermal_set_mode,
	.get_trip_type = omap_thermal_get_trip_type,
	.get_trip_temp = omap_thermal_get_trip_temp,
	.get_crit_temp = omap_thermal_get_crit_temp,
};

int omap_thermal_expose_sensor(struct omap_bandgap *bg_ptr, int id,
			       char *domain)
{
	struct omap_thermal_data *data;

	data = devm_kzalloc(bg_ptr->dev, sizeof(*data), GFP_KERNEL);
	if (!data) {
		dev_err(bg_ptr->dev, "kzalloc fail\n");
		return -ENOMEM;
	}
	data->sensor_id = id;
	data->bg_ptr = bg_ptr;
	data->mode = THERMAL_DEVICE_ENABLED;
	INIT_WORK(&data->thermal_wq, omap_thermal_work);

	/* TODO: remove TC1 TC2 */
	/* Create thermal zone */
	data->omap_thermal = thermal_zone_device_register(domain,
				OMAP_TRIP_NUMBER, 0, data, &omap_thermal_ops,
				0, FAST_TEMP_MONITORING_RATE, 0, 0);
	if (IS_ERR_OR_NULL(data->omap_thermal)) {
		dev_err(bg_ptr->dev, "thermal zone device is NULL\n");
		return PTR_ERR(data->omap_thermal);
	}
	data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
	omap_bandgap_set_sensor_data(bg_ptr, id, data);

	return 0;
}

int omap_thermal_remove_sensor(struct omap_bandgap *bg_ptr, int id)
{
	struct omap_thermal_data *data;

	data = omap_bandgap_get_sensor_data(bg_ptr, id);

	thermal_zone_device_unregister(data->omap_thermal);

	return 0;
}

int omap_thermal_report_sensor_temperature(struct omap_bandgap *bg_ptr, int id)
{
	struct omap_thermal_data *data;

	data = omap_bandgap_get_sensor_data(bg_ptr, id);

	schedule_work(&data->thermal_wq);

	return 0;
}

static int omap_thermal_build_cpufreq_clip(struct omap_bandgap *bg_ptr,
					   struct freq_clip_table **tab_ptr,
					   int *tab_size)
{
	struct cpufreq_frequency_table *freq_table;
	struct freq_clip_table *tab;
	int i, count = 0;

	freq_table = cpufreq_frequency_get_table(0);
	if (IS_ERR_OR_NULL(freq_table)) {
		dev_err(bg_ptr->dev,
			"%s: failed to get cpufreq table (%p)\n",
			__func__, freq_table);
		return -EINVAL;
	}

	for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
		unsigned int freq = freq_table[i].frequency;
		if (freq == CPUFREQ_ENTRY_INVALID)
			continue;
		count++;
	}

	tab = devm_kzalloc(bg_ptr->dev, sizeof(*tab) * count, GFP_KERNEL);
	if (!tab) {
		dev_err(bg_ptr->dev,
			"%s: no memory available\n", __func__);
		return -ENOMEM;
	}

	for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
		unsigned int freq = freq_table[i].frequency;

		if (freq == CPUFREQ_ENTRY_INVALID)
			continue;

		tab[count - i - 1].freq_clip_max = freq;
		tab[count - i - 1].temp_level = OMAP_TRIP_HOT;
		tab[count - i - 1].mask_val = cpumask_of(0);
	}

	*tab_ptr = tab;
	*tab_size = count;

	return 0;
}

int omap_thermal_register_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
{
	struct omap_thermal_data *data;
	struct freq_clip_table *tab_ptr;
	int tab_size, ret;

	data = omap_bandgap_get_sensor_data(bg_ptr, id);

	ret = omap_thermal_build_cpufreq_clip(bg_ptr, &tab_ptr, &tab_size);
	if (ret < 0) {
		dev_err(bg_ptr->dev,
			"%s: failed to build cpufreq clip table\n", __func__);
		return ret;
	}

	/* Register cooling device */
	data->cool_dev = cpufreq_cooling_register(tab_ptr, tab_size);
	if (IS_ERR_OR_NULL(data->cool_dev)) {
		dev_err(bg_ptr->dev,
			"Failed to register cpufreq cooling device\n");
		return PTR_ERR(data->cool_dev);
	}
	bg_ptr->conf->sensors[id].cooling_data.freq_clip_count = tab_size;

	return 0;
}

int omap_thermal_unregister_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
{
	struct omap_thermal_data *data;

	data = omap_bandgap_get_sensor_data(bg_ptr, id);
	cpufreq_cooling_unregister(data->cool_dev);

	return 0;
}
Commit	Line	Data
445eaf87 EV	1	/*
	2	* OMAP thermal driver interface
	3	*
	4	* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
	5	* Contact:
	6	* Eduardo Valentin <eduardo.valentin@ti.com>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* version 2 as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	20	* 02110-1301 USA
	21	*
	22	*/
	23
	24	#include <linux/device.h>
	25	#include <linux/err.h>
	26	#include <linux/mutex.h>
	27	#include <linux/gfp.h>
	28	#include <linux/kernel.h>
	29	#include <linux/workqueue.h>
	30	#include <linux/thermal.h>
	31	#include <linux/cpufreq.h>
	32	#include <linux/cpu_cooling.h>
	33
	34	#include "omap-thermal.h"
	35	#include "omap-bandgap.h"
	36
	37	/* common data structures */
	38	struct omap_thermal_data {
	39	struct thermal_zone_device *omap_thermal;
	40	struct thermal_cooling_device *cool_dev;
	41	struct omap_bandgap *bg_ptr;
	42	enum thermal_device_mode mode;
	43	struct work_struct thermal_wq;
	44	int sensor_id;
	45	};
	46
	47	static void omap_thermal_work(struct work_struct *work)
	48	{
	49	struct omap_thermal_data *data = container_of(work,
	50	struct omap_thermal_data, thermal_wq);
	51
	52	thermal_zone_device_update(data->omap_thermal);
	53
	54	dev_dbg(&data->omap_thermal->device, "updated thermal zone %s\n",
	55	data->omap_thermal->type);
	56	}
	57
	58	/**
	59	* omap_thermal_hotspot_temperature - returns sensor extrapolated temperature
	60	* @t: omap sensor temperature
	61	* @s: omap sensor slope value
	62	* @c: omap sensor const value
	63	*/
	64	static inline int omap_thermal_hotspot_temperature(int t, int s, int c)
65	{
66	int delta = t * s / 1000 + c;
67
68	if (delta < 0)
69	delta = 0;
70
71	return t + delta;
72	}
73
74	/* thermal zone ops */
75	/* Get temperature callback function for thermal zone*/
76	static inline int omap_thermal_get_temp(struct thermal_zone_device *thermal,
77	unsigned long *temp)
78	{
79	struct omap_thermal_data *data = thermal->devdata;
80	struct omap_bandgap *bg_ptr = data->bg_ptr;
81	struct omap_temp_sensor *s = &bg_ptr->conf->sensors[data->sensor_id];
82	int ret, tmp, pcb_temp, slope, constant;
83
84	ret = omap_bandgap_read_temperature(bg_ptr, data->sensor_id, &tmp);
85	if (ret)
86	return ret;
87
88	pcb_temp = 0;
89	/* TODO: Introduce pcb temperature lookup */
90	/* In case pcb zone is available, use the extrapolation rule with it */
91	if (pcb_temp) {
92	tmp -= pcb_temp;
93	slope = s->slope_pcb;
94	constant = s->constant_pcb;
95	} else {
96	slope = s->slope;
97	constant = s->constant;
98	}
99	*temp = omap_thermal_hotspot_temperature(tmp, slope, constant);
100
101	return ret;
102	}
103
104	/* Bind callback functions for thermal zone */
105	static int omap_thermal_bind(struct thermal_zone_device *thermal,
106	struct thermal_cooling_device *cdev)
107	{
108	struct omap_thermal_data *data = thermal->devdata;
109	int max, id;
110
111	if (IS_ERR_OR_NULL(data))
112	return -ENODEV;
113
114	/* check if this is the cooling device we registered */
115	if (data->cool_dev != cdev)
116	return 0;
117
118	id = data->sensor_id;
119	max = data->bg_ptr->conf->sensors[id].cooling_data.freq_clip_count;
120
121	/* TODO: bind with min and max states */
122	/* Simple thing, two trips, one passive another critical */
123	return thermal_zone_bind_cooling_device(thermal, 0, cdev);
124	}
125
126	/* Unbind callback functions for thermal zone */
127	static int omap_thermal_unbind(struct thermal_zone_device *thermal,
128	struct thermal_cooling_device *cdev)
129	{
130	struct omap_thermal_data *data = thermal->devdata;
131
132	if (IS_ERR_OR_NULL(data))
133	return -ENODEV;
134
135	/* check if this is the cooling device we registered */
136	if (data->cool_dev != cdev)
137	return 0;
138
139	/* Simple thing, two trips, one passive another critical */
140	return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
141	}
142
143	/* Get mode callback functions for thermal zone */
144	static int omap_thermal_get_mode(struct thermal_zone_device *thermal,
145	enum thermal_device_mode *mode)
146	{
147	struct omap_thermal_data *data = thermal->devdata;
148
149	if (data)
150	*mode = data->mode;
151
152	return 0;
153	}
154
155	/* Set mode callback functions for thermal zone */
156	static int omap_thermal_set_mode(struct thermal_zone_device *thermal,
157	enum thermal_device_mode mode)
158	{
159	struct omap_thermal_data *data = thermal->devdata;
160
161	if (!data->omap_thermal) {
162	dev_notice(&thermal->device, "thermal zone not registered\n");
163	return 0;
164	}
165
166	mutex_lock(&data->omap_thermal->lock);
167
168	if (mode == THERMAL_DEVICE_ENABLED)
169	data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
170	else
171	data->omap_thermal->polling_delay = 0;
172
173	mutex_unlock(&data->omap_thermal->lock);
174
175	data->mode = mode;
176	thermal_zone_device_update(data->omap_thermal);
177	dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
178	data->omap_thermal->polling_delay);
179
180	return 0;
181	}
182
183	/* Get trip type callback functions for thermal zone */
184	static int omap_thermal_get_trip_type(struct thermal_zone_device *thermal,
185	int trip, enum thermal_trip_type *type)
186	{
187	if (!omap_thermal_is_valid_trip(trip))
188	return -EINVAL;
189
190	if (trip + 1 == OMAP_TRIP_NUMBER)
191	*type = THERMAL_TRIP_CRITICAL;
192	else
193	*type = THERMAL_TRIP_PASSIVE;
194
195	return 0;
196	}
197
198	/* Get trip temperature callback functions for thermal zone */
199	static int omap_thermal_get_trip_temp(struct thermal_zone_device *thermal,
200	int trip, unsigned long *temp)
201	{
202	if (!omap_thermal_is_valid_trip(trip))
203	return -EINVAL;
204
205	*temp = omap_thermal_get_trip_value(trip);
206
207	return 0;
208	}
209
210	/* Get critical temperature callback functions for thermal zone */
211	static int omap_thermal_get_crit_temp(struct thermal_zone_device *thermal,
212	unsigned long *temp)
213	{
214	/* shutdown zone */
215	return omap_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
216	}
217
218	static struct thermal_zone_device_ops omap_thermal_ops = {
219	.get_temp = omap_thermal_get_temp,
220	/* TODO: add .get_trend */
221	.bind = omap_thermal_bind,
222	.unbind = omap_thermal_unbind,
223	.get_mode = omap_thermal_get_mode,
224	.set_mode = omap_thermal_set_mode,
225	.get_trip_type = omap_thermal_get_trip_type,
226	.get_trip_temp = omap_thermal_get_trip_temp,
227	.get_crit_temp = omap_thermal_get_crit_temp,
228	};
229
230	int omap_thermal_expose_sensor(struct omap_bandgap *bg_ptr, int id,
231	char *domain)
232	{
233	struct omap_thermal_data *data;
234
235	data = devm_kzalloc(bg_ptr->dev, sizeof(*data), GFP_KERNEL);
236	if (!data) {
237	dev_err(bg_ptr->dev, "kzalloc fail\n");
238	return -ENOMEM;
239	}
240	data->sensor_id = id;
241	data->bg_ptr = bg_ptr;
242	data->mode = THERMAL_DEVICE_ENABLED;
243	INIT_WORK(&data->thermal_wq, omap_thermal_work);
244
245	/* TODO: remove TC1 TC2 */
246	/* Create thermal zone */
247	data->omap_thermal = thermal_zone_device_register(domain,
248	OMAP_TRIP_NUMBER, 0, data, &omap_thermal_ops,
249	0, FAST_TEMP_MONITORING_RATE, 0, 0);
250	if (IS_ERR_OR_NULL(data->omap_thermal)) {
251	dev_err(bg_ptr->dev, "thermal zone device is NULL\n");
252	return PTR_ERR(data->omap_thermal);
253	}
254	data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
255	omap_bandgap_set_sensor_data(bg_ptr, id, data);
256
257	return 0;
258	}
259
260	int omap_thermal_remove_sensor(struct omap_bandgap *bg_ptr, int id)
261	{
262	struct omap_thermal_data *data;
263
264	data = omap_bandgap_get_sensor_data(bg_ptr, id);
265
266	thermal_zone_device_unregister(data->omap_thermal);
267
268	return 0;
269	}
270
271	int omap_thermal_report_sensor_temperature(struct omap_bandgap *bg_ptr, int id)
272	{
273	struct omap_thermal_data *data;
274
275	data = omap_bandgap_get_sensor_data(bg_ptr, id);
276
277	schedule_work(&data->thermal_wq);
278
279	return 0;
280	}
281
282	static int omap_thermal_build_cpufreq_clip(struct omap_bandgap *bg_ptr,
283	struct freq_clip_table **tab_ptr,
284	int *tab_size)
285	{
286	struct cpufreq_frequency_table *freq_table;
287	struct freq_clip_table *tab;
288	int i, count = 0;
289
290	freq_table = cpufreq_frequency_get_table(0);
291	if (IS_ERR_OR_NULL(freq_table)) {
292	dev_err(bg_ptr->dev,
293	"%s: failed to get cpufreq table (%p)\n",
294	__func__, freq_table);
295	return -EINVAL;
296	}
297
298	for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
299	unsigned int freq = freq_table[i].frequency;
300	if (freq == CPUFREQ_ENTRY_INVALID)
301	continue;
302	count++;
303	}
304
305	tab = devm_kzalloc(bg_ptr->dev, sizeof(tab) count, GFP_KERNEL);
306	if (!tab) {
307	dev_err(bg_ptr->dev,
308	"%s: no memory available\n", __func__);
309	return -ENOMEM;
310	}
311
312	for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
313	unsigned int freq = freq_table[i].frequency;
314
315	if (freq == CPUFREQ_ENTRY_INVALID)
316	continue;
317
318	tab[count - i - 1].freq_clip_max = freq;
319	tab[count - i - 1].temp_level = OMAP_TRIP_HOT;
320	tab[count - i - 1].mask_val = cpumask_of(0);
321	}
322
323	*tab_ptr = tab;
324	*tab_size = count;
325
326	return 0;
327	}
328
329	int omap_thermal_register_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
330	{
331	struct omap_thermal_data *data;
332	struct freq_clip_table *tab_ptr;
333	int tab_size, ret;
334
335	data = omap_bandgap_get_sensor_data(bg_ptr, id);
336
337	ret = omap_thermal_build_cpufreq_clip(bg_ptr, &tab_ptr, &tab_size);
338	if (ret < 0) {
339	dev_err(bg_ptr->dev,
340	"%s: failed to build cpufreq clip table\n", __func__);
341	return ret;
342	}
343
344	/* Register cooling device */
345	data->cool_dev = cpufreq_cooling_register(tab_ptr, tab_size);
346	if (IS_ERR_OR_NULL(data->cool_dev)) {
347	dev_err(bg_ptr->dev,
348	"Failed to register cpufreq cooling device\n");
349	return PTR_ERR(data->cool_dev);
350	}
351	bg_ptr->conf->sensors[id].cooling_data.freq_clip_count = tab_size;
352
353	return 0;
354	}
355
356	int omap_thermal_unregister_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
357	{
358	struct omap_thermal_data *data;
359
360	data = omap_bandgap_get_sensor_data(bg_ptr, id);
361	cpufreq_cooling_unregister(data->cool_dev);
362
363	return 0;
364	}