2 * OMAP thermal driver interface
4 * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
6 * Eduardo Valentin <eduardo.valentin@ti.com>
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.
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.
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
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/cpumask.h>
33 #include <linux/cpu_cooling.h>
35 #include "ti-thermal.h"
36 #include "ti-bandgap.h"
38 /* common data structures */
39 struct ti_thermal_data
{
40 struct thermal_zone_device
*ti_thermal
;
41 struct thermal_zone_device
*pcb_tz
;
42 struct thermal_cooling_device
*cool_dev
;
43 struct ti_bandgap
*bgp
;
44 enum thermal_device_mode mode
;
45 struct work_struct thermal_wq
;
49 static void ti_thermal_work(struct work_struct
*work
)
51 struct ti_thermal_data
*data
= container_of(work
,
52 struct ti_thermal_data
, thermal_wq
);
54 thermal_zone_device_update(data
->ti_thermal
);
56 dev_dbg(&data
->ti_thermal
->device
, "updated thermal zone %s\n",
57 data
->ti_thermal
->type
);
61 * ti_thermal_hotspot_temperature - returns sensor extrapolated temperature
62 * @t: omap sensor temperature
63 * @s: omap sensor slope value
64 * @c: omap sensor const value
66 static inline int ti_thermal_hotspot_temperature(int t
, int s
, int c
)
68 int delta
= t
* s
/ 1000 + c
;
76 /* thermal zone ops */
77 /* Get temperature callback function for thermal zone*/
78 static inline int ti_thermal_get_temp(struct thermal_zone_device
*thermal
,
81 struct thermal_zone_device
*pcb_tz
= NULL
;
82 struct ti_thermal_data
*data
= thermal
->devdata
;
83 struct ti_bandgap
*bgp
;
84 const struct ti_temp_sensor
*s
;
85 int ret
, tmp
, slope
, constant
;
86 unsigned long pcb_temp
;
92 s
= &bgp
->conf
->sensors
[data
->sensor_id
];
94 ret
= ti_bandgap_read_temperature(bgp
, data
->sensor_id
, &tmp
);
98 /* Default constants */
100 constant
= s
->constant
;
102 pcb_tz
= data
->pcb_tz
;
103 /* In case pcb zone is available, use the extrapolation rule with it */
104 if (!IS_ERR(pcb_tz
)) {
105 ret
= thermal_zone_get_temp(pcb_tz
, &pcb_temp
);
107 tmp
-= pcb_temp
; /* got a valid PCB temp */
108 slope
= s
->slope_pcb
;
109 constant
= s
->constant_pcb
;
112 "Failed to read PCB state. Using defaults\n");
115 *temp
= ti_thermal_hotspot_temperature(tmp
, slope
, constant
);
120 /* Bind callback functions for thermal zone */
121 static int ti_thermal_bind(struct thermal_zone_device
*thermal
,
122 struct thermal_cooling_device
*cdev
)
124 struct ti_thermal_data
*data
= thermal
->devdata
;
127 if (!data
|| IS_ERR(data
))
130 /* check if this is the cooling device we registered */
131 if (data
->cool_dev
!= cdev
)
134 id
= data
->sensor_id
;
136 /* Simple thing, two trips, one passive another critical */
137 return thermal_zone_bind_cooling_device(thermal
, 0, cdev
,
138 /* bind with min and max states defined by cpu_cooling */
143 /* Unbind callback functions for thermal zone */
144 static int ti_thermal_unbind(struct thermal_zone_device
*thermal
,
145 struct thermal_cooling_device
*cdev
)
147 struct ti_thermal_data
*data
= thermal
->devdata
;
149 if (!data
|| IS_ERR(data
))
152 /* check if this is the cooling device we registered */
153 if (data
->cool_dev
!= cdev
)
156 /* Simple thing, two trips, one passive another critical */
157 return thermal_zone_unbind_cooling_device(thermal
, 0, cdev
);
160 /* Get mode callback functions for thermal zone */
161 static int ti_thermal_get_mode(struct thermal_zone_device
*thermal
,
162 enum thermal_device_mode
*mode
)
164 struct ti_thermal_data
*data
= thermal
->devdata
;
172 /* Set mode callback functions for thermal zone */
173 static int ti_thermal_set_mode(struct thermal_zone_device
*thermal
,
174 enum thermal_device_mode mode
)
176 struct ti_thermal_data
*data
= thermal
->devdata
;
178 if (!data
->ti_thermal
) {
179 dev_notice(&thermal
->device
, "thermal zone not registered\n");
183 mutex_lock(&data
->ti_thermal
->lock
);
185 if (mode
== THERMAL_DEVICE_ENABLED
)
186 data
->ti_thermal
->polling_delay
= FAST_TEMP_MONITORING_RATE
;
188 data
->ti_thermal
->polling_delay
= 0;
190 mutex_unlock(&data
->ti_thermal
->lock
);
193 thermal_zone_device_update(data
->ti_thermal
);
194 dev_dbg(&thermal
->device
, "thermal polling set for duration=%d msec\n",
195 data
->ti_thermal
->polling_delay
);
200 /* Get trip type callback functions for thermal zone */
201 static int ti_thermal_get_trip_type(struct thermal_zone_device
*thermal
,
202 int trip
, enum thermal_trip_type
*type
)
204 if (!ti_thermal_is_valid_trip(trip
))
207 if (trip
+ 1 == OMAP_TRIP_NUMBER
)
208 *type
= THERMAL_TRIP_CRITICAL
;
210 *type
= THERMAL_TRIP_PASSIVE
;
215 /* Get trip temperature callback functions for thermal zone */
216 static int ti_thermal_get_trip_temp(struct thermal_zone_device
*thermal
,
217 int trip
, unsigned long *temp
)
219 if (!ti_thermal_is_valid_trip(trip
))
222 *temp
= ti_thermal_get_trip_value(trip
);
227 /* Get the temperature trend callback functions for thermal zone */
228 static int ti_thermal_get_trend(struct thermal_zone_device
*thermal
,
229 int trip
, enum thermal_trend
*trend
)
231 struct ti_thermal_data
*data
= thermal
->devdata
;
232 struct ti_bandgap
*bgp
;
236 id
= data
->sensor_id
;
238 ret
= ti_bandgap_get_trend(bgp
, id
, &tr
);
243 *trend
= THERMAL_TREND_RAISING
;
245 *trend
= THERMAL_TREND_DROPPING
;
247 *trend
= THERMAL_TREND_STABLE
;
252 /* Get critical temperature callback functions for thermal zone */
253 static int ti_thermal_get_crit_temp(struct thermal_zone_device
*thermal
,
257 return ti_thermal_get_trip_temp(thermal
, OMAP_TRIP_NUMBER
- 1, temp
);
260 static struct thermal_zone_device_ops ti_thermal_ops
= {
261 .get_temp
= ti_thermal_get_temp
,
262 .get_trend
= ti_thermal_get_trend
,
263 .bind
= ti_thermal_bind
,
264 .unbind
= ti_thermal_unbind
,
265 .get_mode
= ti_thermal_get_mode
,
266 .set_mode
= ti_thermal_set_mode
,
267 .get_trip_type
= ti_thermal_get_trip_type
,
268 .get_trip_temp
= ti_thermal_get_trip_temp
,
269 .get_crit_temp
= ti_thermal_get_crit_temp
,
272 static struct ti_thermal_data
273 *ti_thermal_build_data(struct ti_bandgap
*bgp
, int id
)
275 struct ti_thermal_data
*data
;
277 data
= devm_kzalloc(bgp
->dev
, sizeof(*data
), GFP_KERNEL
);
279 dev_err(bgp
->dev
, "kzalloc fail\n");
282 data
->sensor_id
= id
;
284 data
->mode
= THERMAL_DEVICE_ENABLED
;
285 /* pcb_tz will be either valid or PTR_ERR() */
286 data
->pcb_tz
= thermal_zone_get_zone_by_name("pcb");
287 INIT_WORK(&data
->thermal_wq
, ti_thermal_work
);
292 int ti_thermal_expose_sensor(struct ti_bandgap
*bgp
, int id
,
295 struct ti_thermal_data
*data
;
297 data
= ti_bandgap_get_sensor_data(bgp
, id
);
299 if (!data
|| IS_ERR(data
))
300 data
= ti_thermal_build_data(bgp
, id
);
305 /* Create thermal zone */
306 data
->ti_thermal
= thermal_zone_device_register(domain
,
307 OMAP_TRIP_NUMBER
, 0, data
, &ti_thermal_ops
,
308 NULL
, FAST_TEMP_MONITORING_RATE
,
309 FAST_TEMP_MONITORING_RATE
);
310 if (IS_ERR(data
->ti_thermal
)) {
311 dev_err(bgp
->dev
, "thermal zone device is NULL\n");
312 return PTR_ERR(data
->ti_thermal
);
314 data
->ti_thermal
->polling_delay
= FAST_TEMP_MONITORING_RATE
;
315 ti_bandgap_set_sensor_data(bgp
, id
, data
);
320 int ti_thermal_remove_sensor(struct ti_bandgap
*bgp
, int id
)
322 struct ti_thermal_data
*data
;
324 data
= ti_bandgap_get_sensor_data(bgp
, id
);
326 thermal_zone_device_unregister(data
->ti_thermal
);
331 int ti_thermal_report_sensor_temperature(struct ti_bandgap
*bgp
, int id
)
333 struct ti_thermal_data
*data
;
335 data
= ti_bandgap_get_sensor_data(bgp
, id
);
337 schedule_work(&data
->thermal_wq
);
342 int ti_thermal_register_cpu_cooling(struct ti_bandgap
*bgp
, int id
)
344 struct ti_thermal_data
*data
;
346 data
= ti_bandgap_get_sensor_data(bgp
, id
);
347 if (!data
|| IS_ERR(data
))
348 data
= ti_thermal_build_data(bgp
, id
);
353 if (!cpufreq_get_current_driver()) {
354 dev_dbg(bgp
->dev
, "no cpufreq driver yet\n");
355 return -EPROBE_DEFER
;
358 /* Register cooling device */
359 data
->cool_dev
= cpufreq_cooling_register(cpu_present_mask
);
360 if (IS_ERR(data
->cool_dev
)) {
362 "Failed to register cpufreq cooling device\n");
363 return PTR_ERR(data
->cool_dev
);
365 ti_bandgap_set_sensor_data(bgp
, id
, data
);
370 int ti_thermal_unregister_cpu_cooling(struct ti_bandgap
*bgp
, int id
)
372 struct ti_thermal_data
*data
;
374 data
= ti_bandgap_get_sensor_data(bgp
, id
);
375 cpufreq_cooling_unregister(data
->cool_dev
);