Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1 | /* |
| 2 | * thermal.c - Generic Thermal Management Sysfs support. |
| 3 | * |
| 4 | * Copyright (C) 2008 Intel Corp |
| 5 | * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com> |
| 6 | * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com> |
| 7 | * |
| 8 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; version 2 of the License. |
| 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 | * |
| 19 | * You should have received a copy of the GNU General Public License along |
| 20 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 21 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 22 | * |
| 23 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 24 | */ |
| 25 | |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/device.h> |
| 28 | #include <linux/err.h> |
| 29 | #include <linux/kdev_t.h> |
| 30 | #include <linux/idr.h> |
| 31 | #include <linux/thermal.h> |
| 32 | #include <linux/spinlock.h> |
Matthew Garrett | b1569e9 | 2008-12-03 17:55:32 +0000 | [diff] [blame] | 33 | #include <linux/reboot.h> |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 34 | |
Zhang Rui | 63c4ec9 | 2008-04-21 16:07:13 +0800 | [diff] [blame] | 35 | MODULE_AUTHOR("Zhang Rui"); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 36 | MODULE_DESCRIPTION("Generic thermal management sysfs support"); |
| 37 | MODULE_LICENSE("GPL"); |
| 38 | |
| 39 | #define PREFIX "Thermal: " |
| 40 | |
| 41 | struct thermal_cooling_device_instance { |
| 42 | int id; |
| 43 | char name[THERMAL_NAME_LENGTH]; |
| 44 | struct thermal_zone_device *tz; |
| 45 | struct thermal_cooling_device *cdev; |
| 46 | int trip; |
| 47 | char attr_name[THERMAL_NAME_LENGTH]; |
| 48 | struct device_attribute attr; |
| 49 | struct list_head node; |
| 50 | }; |
| 51 | |
| 52 | static DEFINE_IDR(thermal_tz_idr); |
| 53 | static DEFINE_IDR(thermal_cdev_idr); |
| 54 | static DEFINE_MUTEX(thermal_idr_lock); |
| 55 | |
| 56 | static LIST_HEAD(thermal_tz_list); |
| 57 | static LIST_HEAD(thermal_cdev_list); |
| 58 | static DEFINE_MUTEX(thermal_list_lock); |
| 59 | |
| 60 | static int get_idr(struct idr *idr, struct mutex *lock, int *id) |
| 61 | { |
| 62 | int err; |
| 63 | |
| 64 | again: |
| 65 | if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0)) |
| 66 | return -ENOMEM; |
| 67 | |
| 68 | if (lock) |
| 69 | mutex_lock(lock); |
| 70 | err = idr_get_new(idr, NULL, id); |
| 71 | if (lock) |
| 72 | mutex_unlock(lock); |
| 73 | if (unlikely(err == -EAGAIN)) |
| 74 | goto again; |
| 75 | else if (unlikely(err)) |
| 76 | return err; |
| 77 | |
| 78 | *id = *id & MAX_ID_MASK; |
| 79 | return 0; |
| 80 | } |
| 81 | |
| 82 | static void release_idr(struct idr *idr, struct mutex *lock, int id) |
| 83 | { |
| 84 | if (lock) |
| 85 | mutex_lock(lock); |
| 86 | idr_remove(idr, id); |
| 87 | if (lock) |
| 88 | mutex_unlock(lock); |
| 89 | } |
| 90 | |
| 91 | /* sys I/F for thermal zone */ |
| 92 | |
| 93 | #define to_thermal_zone(_dev) \ |
| 94 | container_of(_dev, struct thermal_zone_device, device) |
| 95 | |
| 96 | static ssize_t |
| 97 | type_show(struct device *dev, struct device_attribute *attr, char *buf) |
| 98 | { |
| 99 | struct thermal_zone_device *tz = to_thermal_zone(dev); |
| 100 | |
| 101 | return sprintf(buf, "%s\n", tz->type); |
| 102 | } |
| 103 | |
| 104 | static ssize_t |
| 105 | temp_show(struct device *dev, struct device_attribute *attr, char *buf) |
| 106 | { |
| 107 | struct thermal_zone_device *tz = to_thermal_zone(dev); |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 108 | long temperature; |
| 109 | int ret; |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 110 | |
| 111 | if (!tz->ops->get_temp) |
| 112 | return -EPERM; |
| 113 | |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 114 | ret = tz->ops->get_temp(tz, &temperature); |
| 115 | |
| 116 | if (ret) |
| 117 | return ret; |
| 118 | |
| 119 | return sprintf(buf, "%ld\n", temperature); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | static ssize_t |
| 123 | mode_show(struct device *dev, struct device_attribute *attr, char *buf) |
| 124 | { |
| 125 | struct thermal_zone_device *tz = to_thermal_zone(dev); |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 126 | enum thermal_device_mode mode; |
| 127 | int result; |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 128 | |
| 129 | if (!tz->ops->get_mode) |
| 130 | return -EPERM; |
| 131 | |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 132 | result = tz->ops->get_mode(tz, &mode); |
| 133 | if (result) |
| 134 | return result; |
| 135 | |
| 136 | return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled" |
| 137 | : "disabled"); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | static ssize_t |
| 141 | mode_store(struct device *dev, struct device_attribute *attr, |
| 142 | const char *buf, size_t count) |
| 143 | { |
| 144 | struct thermal_zone_device *tz = to_thermal_zone(dev); |
| 145 | int result; |
| 146 | |
| 147 | if (!tz->ops->set_mode) |
| 148 | return -EPERM; |
| 149 | |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 150 | if (!strncmp(buf, "enabled", sizeof("enabled"))) |
| 151 | result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED); |
| 152 | else if (!strncmp(buf, "disabled", sizeof("disabled"))) |
| 153 | result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED); |
| 154 | else |
| 155 | result = -EINVAL; |
| 156 | |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 157 | if (result) |
| 158 | return result; |
| 159 | |
| 160 | return count; |
| 161 | } |
| 162 | |
| 163 | static ssize_t |
| 164 | trip_point_type_show(struct device *dev, struct device_attribute *attr, |
| 165 | char *buf) |
| 166 | { |
| 167 | struct thermal_zone_device *tz = to_thermal_zone(dev); |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 168 | enum thermal_trip_type type; |
| 169 | int trip, result; |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 170 | |
| 171 | if (!tz->ops->get_trip_type) |
| 172 | return -EPERM; |
| 173 | |
| 174 | if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip)) |
| 175 | return -EINVAL; |
| 176 | |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 177 | result = tz->ops->get_trip_type(tz, trip, &type); |
| 178 | if (result) |
| 179 | return result; |
| 180 | |
| 181 | switch (type) { |
| 182 | case THERMAL_TRIP_CRITICAL: |
| 183 | return sprintf(buf, "critical"); |
| 184 | case THERMAL_TRIP_HOT: |
| 185 | return sprintf(buf, "hot"); |
| 186 | case THERMAL_TRIP_PASSIVE: |
| 187 | return sprintf(buf, "passive"); |
| 188 | case THERMAL_TRIP_ACTIVE: |
| 189 | return sprintf(buf, "active"); |
| 190 | default: |
| 191 | return sprintf(buf, "unknown"); |
| 192 | } |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 193 | } |
| 194 | |
| 195 | static ssize_t |
| 196 | trip_point_temp_show(struct device *dev, struct device_attribute *attr, |
| 197 | char *buf) |
| 198 | { |
| 199 | struct thermal_zone_device *tz = to_thermal_zone(dev); |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 200 | int trip, ret; |
| 201 | long temperature; |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 202 | |
| 203 | if (!tz->ops->get_trip_temp) |
| 204 | return -EPERM; |
| 205 | |
| 206 | if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip)) |
| 207 | return -EINVAL; |
| 208 | |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 209 | ret = tz->ops->get_trip_temp(tz, trip, &temperature); |
| 210 | |
| 211 | if (ret) |
| 212 | return ret; |
| 213 | |
| 214 | return sprintf(buf, "%ld\n", temperature); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 215 | } |
| 216 | |
Matthew Garrett | 03a971a | 2008-12-03 18:00:38 +0000 | [diff] [blame] | 217 | static ssize_t |
| 218 | passive_store(struct device *dev, struct device_attribute *attr, |
| 219 | const char *buf, size_t count) |
| 220 | { |
| 221 | struct thermal_zone_device *tz = to_thermal_zone(dev); |
| 222 | struct thermal_cooling_device *cdev = NULL; |
| 223 | int state; |
| 224 | |
| 225 | if (!sscanf(buf, "%d\n", &state)) |
| 226 | return -EINVAL; |
| 227 | |
| 228 | if (state && !tz->forced_passive) { |
| 229 | mutex_lock(&thermal_list_lock); |
| 230 | list_for_each_entry(cdev, &thermal_cdev_list, node) { |
| 231 | if (!strncmp("Processor", cdev->type, |
| 232 | sizeof("Processor"))) |
| 233 | thermal_zone_bind_cooling_device(tz, |
| 234 | THERMAL_TRIPS_NONE, |
| 235 | cdev); |
| 236 | } |
| 237 | mutex_unlock(&thermal_list_lock); |
| 238 | } else if (!state && tz->forced_passive) { |
| 239 | mutex_lock(&thermal_list_lock); |
| 240 | list_for_each_entry(cdev, &thermal_cdev_list, node) { |
| 241 | if (!strncmp("Processor", cdev->type, |
| 242 | sizeof("Processor"))) |
| 243 | thermal_zone_unbind_cooling_device(tz, |
| 244 | THERMAL_TRIPS_NONE, |
| 245 | cdev); |
| 246 | } |
| 247 | mutex_unlock(&thermal_list_lock); |
| 248 | } |
| 249 | |
| 250 | tz->tc1 = 1; |
| 251 | tz->tc2 = 1; |
| 252 | |
| 253 | if (!tz->passive_delay) |
| 254 | tz->passive_delay = 1000; |
| 255 | |
| 256 | if (!tz->polling_delay) |
| 257 | tz->polling_delay = 10000; |
| 258 | |
| 259 | tz->forced_passive = state; |
| 260 | |
| 261 | thermal_zone_device_update(tz); |
| 262 | |
| 263 | return count; |
| 264 | } |
| 265 | |
| 266 | static ssize_t |
| 267 | passive_show(struct device *dev, struct device_attribute *attr, |
| 268 | char *buf) |
| 269 | { |
| 270 | struct thermal_zone_device *tz = to_thermal_zone(dev); |
| 271 | |
| 272 | return sprintf(buf, "%d\n", tz->forced_passive); |
| 273 | } |
| 274 | |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 275 | static DEVICE_ATTR(type, 0444, type_show, NULL); |
| 276 | static DEVICE_ATTR(temp, 0444, temp_show, NULL); |
| 277 | static DEVICE_ATTR(mode, 0644, mode_show, mode_store); |
Matthew Garrett | 03a971a | 2008-12-03 18:00:38 +0000 | [diff] [blame] | 278 | static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \ |
| 279 | passive_store); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 280 | |
| 281 | static struct device_attribute trip_point_attrs[] = { |
| 282 | __ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL), |
| 283 | __ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL), |
| 284 | __ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL), |
| 285 | __ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL), |
| 286 | __ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL), |
| 287 | __ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL), |
| 288 | __ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL), |
| 289 | __ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL), |
| 290 | __ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL), |
| 291 | __ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL), |
| 292 | __ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL), |
| 293 | __ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL), |
| 294 | __ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL), |
| 295 | __ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL), |
| 296 | __ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL), |
| 297 | __ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL), |
| 298 | __ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL), |
| 299 | __ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL), |
| 300 | __ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL), |
| 301 | __ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL), |
Krzysztof Helt | 5f1a3f2 | 2008-04-15 14:34:47 -0700 | [diff] [blame] | 302 | __ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL), |
| 303 | __ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL), |
| 304 | __ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL), |
| 305 | __ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL), |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 306 | }; |
| 307 | |
| 308 | #define TRIP_POINT_ATTR_ADD(_dev, _index, result) \ |
| 309 | do { \ |
| 310 | result = device_create_file(_dev, \ |
| 311 | &trip_point_attrs[_index * 2]); \ |
| 312 | if (result) \ |
| 313 | break; \ |
| 314 | result = device_create_file(_dev, \ |
| 315 | &trip_point_attrs[_index * 2 + 1]); \ |
| 316 | } while (0) |
| 317 | |
| 318 | #define TRIP_POINT_ATTR_REMOVE(_dev, _index) \ |
| 319 | do { \ |
| 320 | device_remove_file(_dev, &trip_point_attrs[_index * 2]); \ |
| 321 | device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]); \ |
| 322 | } while (0) |
| 323 | |
| 324 | /* sys I/F for cooling device */ |
| 325 | #define to_cooling_device(_dev) \ |
| 326 | container_of(_dev, struct thermal_cooling_device, device) |
| 327 | |
| 328 | static ssize_t |
| 329 | thermal_cooling_device_type_show(struct device *dev, |
| 330 | struct device_attribute *attr, char *buf) |
| 331 | { |
| 332 | struct thermal_cooling_device *cdev = to_cooling_device(dev); |
| 333 | |
| 334 | return sprintf(buf, "%s\n", cdev->type); |
| 335 | } |
| 336 | |
| 337 | static ssize_t |
| 338 | thermal_cooling_device_max_state_show(struct device *dev, |
| 339 | struct device_attribute *attr, char *buf) |
| 340 | { |
| 341 | struct thermal_cooling_device *cdev = to_cooling_device(dev); |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 342 | unsigned long state; |
| 343 | int ret; |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 344 | |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 345 | ret = cdev->ops->get_max_state(cdev, &state); |
| 346 | if (ret) |
| 347 | return ret; |
| 348 | return sprintf(buf, "%ld\n", state); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 349 | } |
| 350 | |
| 351 | static ssize_t |
| 352 | thermal_cooling_device_cur_state_show(struct device *dev, |
| 353 | struct device_attribute *attr, char *buf) |
| 354 | { |
| 355 | struct thermal_cooling_device *cdev = to_cooling_device(dev); |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 356 | unsigned long state; |
| 357 | int ret; |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 358 | |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 359 | ret = cdev->ops->get_cur_state(cdev, &state); |
| 360 | if (ret) |
| 361 | return ret; |
| 362 | return sprintf(buf, "%ld\n", state); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 363 | } |
| 364 | |
| 365 | static ssize_t |
| 366 | thermal_cooling_device_cur_state_store(struct device *dev, |
| 367 | struct device_attribute *attr, |
| 368 | const char *buf, size_t count) |
| 369 | { |
| 370 | struct thermal_cooling_device *cdev = to_cooling_device(dev); |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 371 | unsigned long state; |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 372 | int result; |
| 373 | |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 374 | if (!sscanf(buf, "%ld\n", &state)) |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 375 | return -EINVAL; |
| 376 | |
| 377 | if (state < 0) |
| 378 | return -EINVAL; |
| 379 | |
| 380 | result = cdev->ops->set_cur_state(cdev, state); |
| 381 | if (result) |
| 382 | return result; |
| 383 | return count; |
| 384 | } |
| 385 | |
| 386 | static struct device_attribute dev_attr_cdev_type = |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 387 | __ATTR(type, 0444, thermal_cooling_device_type_show, NULL); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 388 | static DEVICE_ATTR(max_state, 0444, |
| 389 | thermal_cooling_device_max_state_show, NULL); |
| 390 | static DEVICE_ATTR(cur_state, 0644, |
| 391 | thermal_cooling_device_cur_state_show, |
| 392 | thermal_cooling_device_cur_state_store); |
| 393 | |
| 394 | static ssize_t |
| 395 | thermal_cooling_device_trip_point_show(struct device *dev, |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 396 | struct device_attribute *attr, char *buf) |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 397 | { |
| 398 | struct thermal_cooling_device_instance *instance; |
| 399 | |
| 400 | instance = |
| 401 | container_of(attr, struct thermal_cooling_device_instance, attr); |
| 402 | |
| 403 | if (instance->trip == THERMAL_TRIPS_NONE) |
| 404 | return sprintf(buf, "-1\n"); |
| 405 | else |
| 406 | return sprintf(buf, "%d\n", instance->trip); |
| 407 | } |
| 408 | |
| 409 | /* Device management */ |
| 410 | |
Rene Herman | 16d7523 | 2008-06-24 19:38:56 +0200 | [diff] [blame] | 411 | #if defined(CONFIG_THERMAL_HWMON) |
| 412 | |
Zhang Rui | e68b16a | 2008-04-21 16:07:52 +0800 | [diff] [blame] | 413 | /* hwmon sys I/F */ |
| 414 | #include <linux/hwmon.h> |
| 415 | static LIST_HEAD(thermal_hwmon_list); |
| 416 | |
| 417 | static ssize_t |
| 418 | name_show(struct device *dev, struct device_attribute *attr, char *buf) |
| 419 | { |
Greg Kroah-Hartman | 0e968a3 | 2009-04-30 14:43:31 -0700 | [diff] [blame] | 420 | struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev); |
Zhang Rui | e68b16a | 2008-04-21 16:07:52 +0800 | [diff] [blame] | 421 | return sprintf(buf, "%s\n", hwmon->type); |
| 422 | } |
| 423 | static DEVICE_ATTR(name, 0444, name_show, NULL); |
| 424 | |
| 425 | static ssize_t |
| 426 | temp_input_show(struct device *dev, struct device_attribute *attr, char *buf) |
| 427 | { |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 428 | long temperature; |
| 429 | int ret; |
Zhang Rui | e68b16a | 2008-04-21 16:07:52 +0800 | [diff] [blame] | 430 | struct thermal_hwmon_attr *hwmon_attr |
| 431 | = container_of(attr, struct thermal_hwmon_attr, attr); |
| 432 | struct thermal_zone_device *tz |
| 433 | = container_of(hwmon_attr, struct thermal_zone_device, |
| 434 | temp_input); |
| 435 | |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 436 | ret = tz->ops->get_temp(tz, &temperature); |
| 437 | |
| 438 | if (ret) |
| 439 | return ret; |
| 440 | |
| 441 | return sprintf(buf, "%ld\n", temperature); |
Zhang Rui | e68b16a | 2008-04-21 16:07:52 +0800 | [diff] [blame] | 442 | } |
| 443 | |
| 444 | static ssize_t |
| 445 | temp_crit_show(struct device *dev, struct device_attribute *attr, |
| 446 | char *buf) |
| 447 | { |
| 448 | struct thermal_hwmon_attr *hwmon_attr |
| 449 | = container_of(attr, struct thermal_hwmon_attr, attr); |
| 450 | struct thermal_zone_device *tz |
| 451 | = container_of(hwmon_attr, struct thermal_zone_device, |
| 452 | temp_crit); |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 453 | long temperature; |
| 454 | int ret; |
Zhang Rui | e68b16a | 2008-04-21 16:07:52 +0800 | [diff] [blame] | 455 | |
Matthew Garrett | 6503e5d | 2008-11-27 17:48:13 +0000 | [diff] [blame] | 456 | ret = tz->ops->get_trip_temp(tz, 0, &temperature); |
| 457 | if (ret) |
| 458 | return ret; |
| 459 | |
| 460 | return sprintf(buf, "%ld\n", temperature); |
Zhang Rui | e68b16a | 2008-04-21 16:07:52 +0800 | [diff] [blame] | 461 | } |
| 462 | |
| 463 | |
| 464 | static int |
| 465 | thermal_add_hwmon_sysfs(struct thermal_zone_device *tz) |
| 466 | { |
| 467 | struct thermal_hwmon_device *hwmon; |
| 468 | int new_hwmon_device = 1; |
| 469 | int result; |
| 470 | |
| 471 | mutex_lock(&thermal_list_lock); |
| 472 | list_for_each_entry(hwmon, &thermal_hwmon_list, node) |
| 473 | if (!strcmp(hwmon->type, tz->type)) { |
| 474 | new_hwmon_device = 0; |
| 475 | mutex_unlock(&thermal_list_lock); |
| 476 | goto register_sys_interface; |
| 477 | } |
| 478 | mutex_unlock(&thermal_list_lock); |
| 479 | |
| 480 | hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL); |
| 481 | if (!hwmon) |
| 482 | return -ENOMEM; |
| 483 | |
| 484 | INIT_LIST_HEAD(&hwmon->tz_list); |
| 485 | strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH); |
| 486 | hwmon->device = hwmon_device_register(NULL); |
| 487 | if (IS_ERR(hwmon->device)) { |
| 488 | result = PTR_ERR(hwmon->device); |
| 489 | goto free_mem; |
| 490 | } |
Greg Kroah-Hartman | 0e968a3 | 2009-04-30 14:43:31 -0700 | [diff] [blame] | 491 | dev_set_drvdata(hwmon->device, hwmon); |
Zhang Rui | e68b16a | 2008-04-21 16:07:52 +0800 | [diff] [blame] | 492 | result = device_create_file(hwmon->device, &dev_attr_name); |
| 493 | if (result) |
| 494 | goto unregister_hwmon_device; |
| 495 | |
| 496 | register_sys_interface: |
| 497 | tz->hwmon = hwmon; |
| 498 | hwmon->count++; |
| 499 | |
| 500 | snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH, |
| 501 | "temp%d_input", hwmon->count); |
| 502 | tz->temp_input.attr.attr.name = tz->temp_input.name; |
| 503 | tz->temp_input.attr.attr.mode = 0444; |
| 504 | tz->temp_input.attr.show = temp_input_show; |
| 505 | result = device_create_file(hwmon->device, &tz->temp_input.attr); |
| 506 | if (result) |
| 507 | goto unregister_hwmon_device; |
| 508 | |
| 509 | if (tz->ops->get_crit_temp) { |
| 510 | unsigned long temperature; |
| 511 | if (!tz->ops->get_crit_temp(tz, &temperature)) { |
| 512 | snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH, |
| 513 | "temp%d_crit", hwmon->count); |
| 514 | tz->temp_crit.attr.attr.name = tz->temp_crit.name; |
| 515 | tz->temp_crit.attr.attr.mode = 0444; |
| 516 | tz->temp_crit.attr.show = temp_crit_show; |
| 517 | result = device_create_file(hwmon->device, |
| 518 | &tz->temp_crit.attr); |
| 519 | if (result) |
| 520 | goto unregister_hwmon_device; |
| 521 | } |
| 522 | } |
| 523 | |
| 524 | mutex_lock(&thermal_list_lock); |
| 525 | if (new_hwmon_device) |
| 526 | list_add_tail(&hwmon->node, &thermal_hwmon_list); |
| 527 | list_add_tail(&tz->hwmon_node, &hwmon->tz_list); |
| 528 | mutex_unlock(&thermal_list_lock); |
| 529 | |
| 530 | return 0; |
| 531 | |
| 532 | unregister_hwmon_device: |
| 533 | device_remove_file(hwmon->device, &tz->temp_crit.attr); |
| 534 | device_remove_file(hwmon->device, &tz->temp_input.attr); |
| 535 | if (new_hwmon_device) { |
| 536 | device_remove_file(hwmon->device, &dev_attr_name); |
| 537 | hwmon_device_unregister(hwmon->device); |
| 538 | } |
| 539 | free_mem: |
| 540 | if (new_hwmon_device) |
| 541 | kfree(hwmon); |
| 542 | |
| 543 | return result; |
| 544 | } |
| 545 | |
| 546 | static void |
| 547 | thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz) |
| 548 | { |
| 549 | struct thermal_hwmon_device *hwmon = tz->hwmon; |
| 550 | |
| 551 | tz->hwmon = NULL; |
| 552 | device_remove_file(hwmon->device, &tz->temp_input.attr); |
| 553 | device_remove_file(hwmon->device, &tz->temp_crit.attr); |
| 554 | |
| 555 | mutex_lock(&thermal_list_lock); |
| 556 | list_del(&tz->hwmon_node); |
| 557 | if (!list_empty(&hwmon->tz_list)) { |
| 558 | mutex_unlock(&thermal_list_lock); |
| 559 | return; |
| 560 | } |
| 561 | list_del(&hwmon->node); |
| 562 | mutex_unlock(&thermal_list_lock); |
| 563 | |
| 564 | device_remove_file(hwmon->device, &dev_attr_name); |
| 565 | hwmon_device_unregister(hwmon->device); |
| 566 | kfree(hwmon); |
| 567 | } |
| 568 | #else |
| 569 | static int |
| 570 | thermal_add_hwmon_sysfs(struct thermal_zone_device *tz) |
| 571 | { |
| 572 | return 0; |
| 573 | } |
| 574 | |
| 575 | static void |
| 576 | thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz) |
| 577 | { |
| 578 | } |
| 579 | #endif |
| 580 | |
Matthew Garrett | b1569e9 | 2008-12-03 17:55:32 +0000 | [diff] [blame] | 581 | static void thermal_zone_device_set_polling(struct thermal_zone_device *tz, |
| 582 | int delay) |
| 583 | { |
| 584 | cancel_delayed_work(&(tz->poll_queue)); |
| 585 | |
| 586 | if (!delay) |
| 587 | return; |
| 588 | |
| 589 | if (delay > 1000) |
| 590 | schedule_delayed_work(&(tz->poll_queue), |
| 591 | round_jiffies(msecs_to_jiffies(delay))); |
| 592 | else |
| 593 | schedule_delayed_work(&(tz->poll_queue), |
| 594 | msecs_to_jiffies(delay)); |
| 595 | } |
| 596 | |
| 597 | static void thermal_zone_device_passive(struct thermal_zone_device *tz, |
| 598 | int temp, int trip_temp, int trip) |
| 599 | { |
| 600 | int trend = 0; |
| 601 | struct thermal_cooling_device_instance *instance; |
| 602 | struct thermal_cooling_device *cdev; |
| 603 | long state, max_state; |
| 604 | |
| 605 | /* |
| 606 | * Above Trip? |
| 607 | * ----------- |
| 608 | * Calculate the thermal trend (using the passive cooling equation) |
| 609 | * and modify the performance limit for all passive cooling devices |
| 610 | * accordingly. Note that we assume symmetry. |
| 611 | */ |
| 612 | if (temp >= trip_temp) { |
| 613 | tz->passive = true; |
| 614 | |
| 615 | trend = (tz->tc1 * (temp - tz->last_temperature)) + |
| 616 | (tz->tc2 * (temp - trip_temp)); |
| 617 | |
| 618 | /* Heating up? */ |
| 619 | if (trend > 0) { |
| 620 | list_for_each_entry(instance, &tz->cooling_devices, |
| 621 | node) { |
| 622 | if (instance->trip != trip) |
| 623 | continue; |
| 624 | cdev = instance->cdev; |
| 625 | cdev->ops->get_cur_state(cdev, &state); |
| 626 | cdev->ops->get_max_state(cdev, &max_state); |
| 627 | if (state++ < max_state) |
| 628 | cdev->ops->set_cur_state(cdev, state); |
| 629 | } |
| 630 | } else if (trend < 0) { /* Cooling off? */ |
| 631 | list_for_each_entry(instance, &tz->cooling_devices, |
| 632 | node) { |
| 633 | if (instance->trip != trip) |
| 634 | continue; |
| 635 | cdev = instance->cdev; |
| 636 | cdev->ops->get_cur_state(cdev, &state); |
| 637 | cdev->ops->get_max_state(cdev, &max_state); |
| 638 | if (state > 0) |
| 639 | cdev->ops->set_cur_state(cdev, --state); |
| 640 | } |
| 641 | } |
| 642 | return; |
| 643 | } |
| 644 | |
| 645 | /* |
| 646 | * Below Trip? |
| 647 | * ----------- |
| 648 | * Implement passive cooling hysteresis to slowly increase performance |
| 649 | * and avoid thrashing around the passive trip point. Note that we |
| 650 | * assume symmetry. |
| 651 | */ |
| 652 | list_for_each_entry(instance, &tz->cooling_devices, node) { |
| 653 | if (instance->trip != trip) |
| 654 | continue; |
| 655 | cdev = instance->cdev; |
| 656 | cdev->ops->get_cur_state(cdev, &state); |
| 657 | cdev->ops->get_max_state(cdev, &max_state); |
| 658 | if (state > 0) |
| 659 | cdev->ops->set_cur_state(cdev, --state); |
| 660 | if (state == 0) |
| 661 | tz->passive = false; |
| 662 | } |
| 663 | } |
| 664 | |
| 665 | static void thermal_zone_device_check(struct work_struct *work) |
| 666 | { |
| 667 | struct thermal_zone_device *tz = container_of(work, struct |
| 668 | thermal_zone_device, |
| 669 | poll_queue.work); |
| 670 | thermal_zone_device_update(tz); |
| 671 | } |
Zhang Rui | e68b16a | 2008-04-21 16:07:52 +0800 | [diff] [blame] | 672 | |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 673 | /** |
| 674 | * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 675 | * @tz: thermal zone device |
| 676 | * @trip: indicates which trip point the cooling devices is |
| 677 | * associated with in this thermal zone. |
| 678 | * @cdev: thermal cooling device |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 679 | * |
| 680 | * This function is usually called in the thermal zone device .bind callback. |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 681 | */ |
| 682 | int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz, |
| 683 | int trip, |
| 684 | struct thermal_cooling_device *cdev) |
| 685 | { |
| 686 | struct thermal_cooling_device_instance *dev; |
| 687 | struct thermal_cooling_device_instance *pos; |
Thomas Sujith | c751670 | 2008-02-15 00:58:50 -0500 | [diff] [blame] | 688 | struct thermal_zone_device *pos1; |
| 689 | struct thermal_cooling_device *pos2; |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 690 | int result; |
| 691 | |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 692 | if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE)) |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 693 | return -EINVAL; |
| 694 | |
Thomas Sujith | c751670 | 2008-02-15 00:58:50 -0500 | [diff] [blame] | 695 | list_for_each_entry(pos1, &thermal_tz_list, node) { |
| 696 | if (pos1 == tz) |
| 697 | break; |
| 698 | } |
| 699 | list_for_each_entry(pos2, &thermal_cdev_list, node) { |
| 700 | if (pos2 == cdev) |
| 701 | break; |
| 702 | } |
| 703 | |
| 704 | if (tz != pos1 || cdev != pos2) |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 705 | return -EINVAL; |
| 706 | |
| 707 | dev = |
| 708 | kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL); |
| 709 | if (!dev) |
| 710 | return -ENOMEM; |
| 711 | dev->tz = tz; |
| 712 | dev->cdev = cdev; |
| 713 | dev->trip = trip; |
| 714 | result = get_idr(&tz->idr, &tz->lock, &dev->id); |
| 715 | if (result) |
| 716 | goto free_mem; |
| 717 | |
| 718 | sprintf(dev->name, "cdev%d", dev->id); |
| 719 | result = |
| 720 | sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name); |
| 721 | if (result) |
| 722 | goto release_idr; |
| 723 | |
| 724 | sprintf(dev->attr_name, "cdev%d_trip_point", dev->id); |
| 725 | dev->attr.attr.name = dev->attr_name; |
| 726 | dev->attr.attr.mode = 0444; |
| 727 | dev->attr.show = thermal_cooling_device_trip_point_show; |
| 728 | result = device_create_file(&tz->device, &dev->attr); |
| 729 | if (result) |
| 730 | goto remove_symbol_link; |
| 731 | |
| 732 | mutex_lock(&tz->lock); |
| 733 | list_for_each_entry(pos, &tz->cooling_devices, node) |
| 734 | if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { |
| 735 | result = -EEXIST; |
| 736 | break; |
| 737 | } |
| 738 | if (!result) |
| 739 | list_add_tail(&dev->node, &tz->cooling_devices); |
| 740 | mutex_unlock(&tz->lock); |
| 741 | |
| 742 | if (!result) |
| 743 | return 0; |
| 744 | |
| 745 | device_remove_file(&tz->device, &dev->attr); |
| 746 | remove_symbol_link: |
| 747 | sysfs_remove_link(&tz->device.kobj, dev->name); |
| 748 | release_idr: |
| 749 | release_idr(&tz->idr, &tz->lock, dev->id); |
| 750 | free_mem: |
| 751 | kfree(dev); |
| 752 | return result; |
| 753 | } |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 754 | |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 755 | EXPORT_SYMBOL(thermal_zone_bind_cooling_device); |
| 756 | |
| 757 | /** |
| 758 | * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 759 | * @tz: thermal zone device |
| 760 | * @trip: indicates which trip point the cooling devices is |
| 761 | * associated with in this thermal zone. |
| 762 | * @cdev: thermal cooling device |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 763 | * |
| 764 | * This function is usually called in the thermal zone device .unbind callback. |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 765 | */ |
| 766 | int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz, |
| 767 | int trip, |
| 768 | struct thermal_cooling_device *cdev) |
| 769 | { |
| 770 | struct thermal_cooling_device_instance *pos, *next; |
| 771 | |
| 772 | mutex_lock(&tz->lock); |
| 773 | list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) { |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 774 | if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) { |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 775 | list_del(&pos->node); |
| 776 | mutex_unlock(&tz->lock); |
| 777 | goto unbind; |
| 778 | } |
| 779 | } |
| 780 | mutex_unlock(&tz->lock); |
| 781 | |
| 782 | return -ENODEV; |
| 783 | |
| 784 | unbind: |
| 785 | device_remove_file(&tz->device, &pos->attr); |
| 786 | sysfs_remove_link(&tz->device.kobj, pos->name); |
| 787 | release_idr(&tz->idr, &tz->lock, pos->id); |
| 788 | kfree(pos); |
| 789 | return 0; |
| 790 | } |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 791 | |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 792 | EXPORT_SYMBOL(thermal_zone_unbind_cooling_device); |
| 793 | |
| 794 | static void thermal_release(struct device *dev) |
| 795 | { |
| 796 | struct thermal_zone_device *tz; |
| 797 | struct thermal_cooling_device *cdev; |
| 798 | |
Kay Sievers | 354655e | 2009-01-06 10:44:37 -0800 | [diff] [blame] | 799 | if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) { |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 800 | tz = to_thermal_zone(dev); |
| 801 | kfree(tz); |
| 802 | } else { |
| 803 | cdev = to_cooling_device(dev); |
| 804 | kfree(cdev); |
| 805 | } |
| 806 | } |
| 807 | |
| 808 | static struct class thermal_class = { |
| 809 | .name = "thermal", |
| 810 | .dev_release = thermal_release, |
| 811 | }; |
| 812 | |
| 813 | /** |
| 814 | * thermal_cooling_device_register - register a new thermal cooling device |
| 815 | * @type: the thermal cooling device type. |
| 816 | * @devdata: device private data. |
| 817 | * @ops: standard thermal cooling devices callbacks. |
| 818 | */ |
| 819 | struct thermal_cooling_device *thermal_cooling_device_register(char *type, |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 820 | void *devdata, |
| 821 | struct |
| 822 | thermal_cooling_device_ops |
| 823 | *ops) |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 824 | { |
| 825 | struct thermal_cooling_device *cdev; |
| 826 | struct thermal_zone_device *pos; |
| 827 | int result; |
| 828 | |
| 829 | if (strlen(type) >= THERMAL_NAME_LENGTH) |
Thomas Sujith | 3e6fda5 | 2008-02-15 00:59:50 -0500 | [diff] [blame] | 830 | return ERR_PTR(-EINVAL); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 831 | |
| 832 | if (!ops || !ops->get_max_state || !ops->get_cur_state || |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 833 | !ops->set_cur_state) |
Thomas Sujith | 3e6fda5 | 2008-02-15 00:59:50 -0500 | [diff] [blame] | 834 | return ERR_PTR(-EINVAL); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 835 | |
| 836 | cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL); |
| 837 | if (!cdev) |
Thomas Sujith | 3e6fda5 | 2008-02-15 00:59:50 -0500 | [diff] [blame] | 838 | return ERR_PTR(-ENOMEM); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 839 | |
| 840 | result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id); |
| 841 | if (result) { |
| 842 | kfree(cdev); |
Thomas Sujith | 3e6fda5 | 2008-02-15 00:59:50 -0500 | [diff] [blame] | 843 | return ERR_PTR(result); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 844 | } |
| 845 | |
| 846 | strcpy(cdev->type, type); |
| 847 | cdev->ops = ops; |
| 848 | cdev->device.class = &thermal_class; |
| 849 | cdev->devdata = devdata; |
Kay Sievers | 354655e | 2009-01-06 10:44:37 -0800 | [diff] [blame] | 850 | dev_set_name(&cdev->device, "cooling_device%d", cdev->id); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 851 | result = device_register(&cdev->device); |
| 852 | if (result) { |
| 853 | release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id); |
| 854 | kfree(cdev); |
Thomas Sujith | 3e6fda5 | 2008-02-15 00:59:50 -0500 | [diff] [blame] | 855 | return ERR_PTR(result); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 856 | } |
| 857 | |
| 858 | /* sys I/F */ |
| 859 | if (type) { |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 860 | result = device_create_file(&cdev->device, &dev_attr_cdev_type); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 861 | if (result) |
| 862 | goto unregister; |
| 863 | } |
| 864 | |
| 865 | result = device_create_file(&cdev->device, &dev_attr_max_state); |
| 866 | if (result) |
| 867 | goto unregister; |
| 868 | |
| 869 | result = device_create_file(&cdev->device, &dev_attr_cur_state); |
| 870 | if (result) |
| 871 | goto unregister; |
| 872 | |
| 873 | mutex_lock(&thermal_list_lock); |
| 874 | list_add(&cdev->node, &thermal_cdev_list); |
| 875 | list_for_each_entry(pos, &thermal_tz_list, node) { |
| 876 | if (!pos->ops->bind) |
| 877 | continue; |
| 878 | result = pos->ops->bind(pos, cdev); |
| 879 | if (result) |
| 880 | break; |
| 881 | |
| 882 | } |
| 883 | mutex_unlock(&thermal_list_lock); |
| 884 | |
| 885 | if (!result) |
| 886 | return cdev; |
| 887 | |
| 888 | unregister: |
| 889 | release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id); |
| 890 | device_unregister(&cdev->device); |
Thomas Sujith | 3e6fda5 | 2008-02-15 00:59:50 -0500 | [diff] [blame] | 891 | return ERR_PTR(result); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 892 | } |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 893 | |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 894 | EXPORT_SYMBOL(thermal_cooling_device_register); |
| 895 | |
| 896 | /** |
| 897 | * thermal_cooling_device_unregister - removes the registered thermal cooling device |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 898 | * @cdev: the thermal cooling device to remove. |
| 899 | * |
| 900 | * thermal_cooling_device_unregister() must be called when the device is no |
| 901 | * longer needed. |
| 902 | */ |
| 903 | void thermal_cooling_device_unregister(struct |
| 904 | thermal_cooling_device |
| 905 | *cdev) |
| 906 | { |
| 907 | struct thermal_zone_device *tz; |
| 908 | struct thermal_cooling_device *pos = NULL; |
| 909 | |
| 910 | if (!cdev) |
| 911 | return; |
| 912 | |
| 913 | mutex_lock(&thermal_list_lock); |
| 914 | list_for_each_entry(pos, &thermal_cdev_list, node) |
| 915 | if (pos == cdev) |
| 916 | break; |
| 917 | if (pos != cdev) { |
| 918 | /* thermal cooling device not found */ |
| 919 | mutex_unlock(&thermal_list_lock); |
| 920 | return; |
| 921 | } |
| 922 | list_del(&cdev->node); |
| 923 | list_for_each_entry(tz, &thermal_tz_list, node) { |
| 924 | if (!tz->ops->unbind) |
| 925 | continue; |
| 926 | tz->ops->unbind(tz, cdev); |
| 927 | } |
| 928 | mutex_unlock(&thermal_list_lock); |
| 929 | if (cdev->type[0]) |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 930 | device_remove_file(&cdev->device, &dev_attr_cdev_type); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 931 | device_remove_file(&cdev->device, &dev_attr_max_state); |
| 932 | device_remove_file(&cdev->device, &dev_attr_cur_state); |
| 933 | |
| 934 | release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id); |
| 935 | device_unregister(&cdev->device); |
| 936 | return; |
| 937 | } |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 938 | |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 939 | EXPORT_SYMBOL(thermal_cooling_device_unregister); |
| 940 | |
| 941 | /** |
Matthew Garrett | b1569e9 | 2008-12-03 17:55:32 +0000 | [diff] [blame] | 942 | * thermal_zone_device_update - force an update of a thermal zone's state |
| 943 | * @ttz: the thermal zone to update |
| 944 | */ |
| 945 | |
| 946 | void thermal_zone_device_update(struct thermal_zone_device *tz) |
| 947 | { |
| 948 | int count, ret = 0; |
| 949 | long temp, trip_temp; |
| 950 | enum thermal_trip_type trip_type; |
| 951 | struct thermal_cooling_device_instance *instance; |
| 952 | struct thermal_cooling_device *cdev; |
| 953 | |
| 954 | mutex_lock(&tz->lock); |
| 955 | |
| 956 | tz->ops->get_temp(tz, &temp); |
| 957 | |
| 958 | for (count = 0; count < tz->trips; count++) { |
| 959 | tz->ops->get_trip_type(tz, count, &trip_type); |
| 960 | tz->ops->get_trip_temp(tz, count, &trip_temp); |
| 961 | |
| 962 | switch (trip_type) { |
| 963 | case THERMAL_TRIP_CRITICAL: |
Vladimir Zajac | 2932135 | 2009-05-06 19:34:21 +0200 | [diff] [blame] | 964 | if (temp >= trip_temp) { |
Matthew Garrett | b1569e9 | 2008-12-03 17:55:32 +0000 | [diff] [blame] | 965 | if (tz->ops->notify) |
| 966 | ret = tz->ops->notify(tz, count, |
| 967 | trip_type); |
| 968 | if (!ret) { |
| 969 | printk(KERN_EMERG |
| 970 | "Critical temperature reached (%ld C), shutting down.\n", |
| 971 | temp/1000); |
| 972 | orderly_poweroff(true); |
| 973 | } |
| 974 | } |
| 975 | break; |
| 976 | case THERMAL_TRIP_HOT: |
Vladimir Zajac | 2932135 | 2009-05-06 19:34:21 +0200 | [diff] [blame] | 977 | if (temp >= trip_temp) |
Matthew Garrett | b1569e9 | 2008-12-03 17:55:32 +0000 | [diff] [blame] | 978 | if (tz->ops->notify) |
| 979 | tz->ops->notify(tz, count, trip_type); |
| 980 | break; |
| 981 | case THERMAL_TRIP_ACTIVE: |
| 982 | list_for_each_entry(instance, &tz->cooling_devices, |
| 983 | node) { |
| 984 | if (instance->trip != count) |
| 985 | continue; |
| 986 | |
| 987 | cdev = instance->cdev; |
| 988 | |
Vladimir Zajac | 2932135 | 2009-05-06 19:34:21 +0200 | [diff] [blame] | 989 | if (temp >= trip_temp) |
Matthew Garrett | b1569e9 | 2008-12-03 17:55:32 +0000 | [diff] [blame] | 990 | cdev->ops->set_cur_state(cdev, 1); |
| 991 | else |
| 992 | cdev->ops->set_cur_state(cdev, 0); |
| 993 | } |
| 994 | break; |
| 995 | case THERMAL_TRIP_PASSIVE: |
Vladimir Zajac | 2932135 | 2009-05-06 19:34:21 +0200 | [diff] [blame] | 996 | if (temp >= trip_temp || tz->passive) |
Matthew Garrett | b1569e9 | 2008-12-03 17:55:32 +0000 | [diff] [blame] | 997 | thermal_zone_device_passive(tz, temp, |
| 998 | trip_temp, count); |
| 999 | break; |
| 1000 | } |
| 1001 | } |
Matthew Garrett | 03a971a | 2008-12-03 18:00:38 +0000 | [diff] [blame] | 1002 | |
| 1003 | if (tz->forced_passive) |
| 1004 | thermal_zone_device_passive(tz, temp, tz->forced_passive, |
| 1005 | THERMAL_TRIPS_NONE); |
| 1006 | |
Matthew Garrett | b1569e9 | 2008-12-03 17:55:32 +0000 | [diff] [blame] | 1007 | tz->last_temperature = temp; |
| 1008 | if (tz->passive) |
| 1009 | thermal_zone_device_set_polling(tz, tz->passive_delay); |
| 1010 | else if (tz->polling_delay) |
| 1011 | thermal_zone_device_set_polling(tz, tz->polling_delay); |
| 1012 | mutex_unlock(&tz->lock); |
| 1013 | } |
| 1014 | EXPORT_SYMBOL(thermal_zone_device_update); |
| 1015 | |
| 1016 | /** |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1017 | * thermal_zone_device_register - register a new thermal zone device |
| 1018 | * @type: the thermal zone device type |
| 1019 | * @trips: the number of trip points the thermal zone support |
| 1020 | * @devdata: private device data |
| 1021 | * @ops: standard thermal zone device callbacks |
Matthew Garrett | b1569e9 | 2008-12-03 17:55:32 +0000 | [diff] [blame] | 1022 | * @tc1: thermal coefficient 1 for passive calculations |
| 1023 | * @tc2: thermal coefficient 2 for passive calculations |
| 1024 | * @passive_delay: number of milliseconds to wait between polls when |
| 1025 | * performing passive cooling |
| 1026 | * @polling_delay: number of milliseconds to wait between polls when checking |
| 1027 | * whether trip points have been crossed (0 for interrupt |
| 1028 | * driven systems) |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1029 | * |
| 1030 | * thermal_zone_device_unregister() must be called when the device is no |
Matthew Garrett | b1569e9 | 2008-12-03 17:55:32 +0000 | [diff] [blame] | 1031 | * longer needed. The passive cooling formula uses tc1 and tc2 as described in |
| 1032 | * section 11.1.5.1 of the ACPI specification 3.0. |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1033 | */ |
| 1034 | struct thermal_zone_device *thermal_zone_device_register(char *type, |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 1035 | int trips, |
| 1036 | void *devdata, struct |
| 1037 | thermal_zone_device_ops |
Matthew Garrett | b1569e9 | 2008-12-03 17:55:32 +0000 | [diff] [blame] | 1038 | *ops, int tc1, int |
| 1039 | tc2, |
| 1040 | int passive_delay, |
| 1041 | int polling_delay) |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1042 | { |
| 1043 | struct thermal_zone_device *tz; |
| 1044 | struct thermal_cooling_device *pos; |
Matthew Garrett | 03a971a | 2008-12-03 18:00:38 +0000 | [diff] [blame] | 1045 | enum thermal_trip_type trip_type; |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1046 | int result; |
| 1047 | int count; |
Matthew Garrett | 03a971a | 2008-12-03 18:00:38 +0000 | [diff] [blame] | 1048 | int passive = 0; |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1049 | |
| 1050 | if (strlen(type) >= THERMAL_NAME_LENGTH) |
Thomas Sujith | 3e6fda5 | 2008-02-15 00:59:50 -0500 | [diff] [blame] | 1051 | return ERR_PTR(-EINVAL); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1052 | |
| 1053 | if (trips > THERMAL_MAX_TRIPS || trips < 0) |
Thomas Sujith | 3e6fda5 | 2008-02-15 00:59:50 -0500 | [diff] [blame] | 1054 | return ERR_PTR(-EINVAL); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1055 | |
| 1056 | if (!ops || !ops->get_temp) |
Thomas Sujith | 3e6fda5 | 2008-02-15 00:59:50 -0500 | [diff] [blame] | 1057 | return ERR_PTR(-EINVAL); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1058 | |
| 1059 | tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL); |
| 1060 | if (!tz) |
Thomas Sujith | 3e6fda5 | 2008-02-15 00:59:50 -0500 | [diff] [blame] | 1061 | return ERR_PTR(-ENOMEM); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1062 | |
| 1063 | INIT_LIST_HEAD(&tz->cooling_devices); |
| 1064 | idr_init(&tz->idr); |
| 1065 | mutex_init(&tz->lock); |
| 1066 | result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id); |
| 1067 | if (result) { |
| 1068 | kfree(tz); |
Thomas Sujith | 3e6fda5 | 2008-02-15 00:59:50 -0500 | [diff] [blame] | 1069 | return ERR_PTR(result); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1070 | } |
| 1071 | |
| 1072 | strcpy(tz->type, type); |
| 1073 | tz->ops = ops; |
| 1074 | tz->device.class = &thermal_class; |
| 1075 | tz->devdata = devdata; |
| 1076 | tz->trips = trips; |
Matthew Garrett | b1569e9 | 2008-12-03 17:55:32 +0000 | [diff] [blame] | 1077 | tz->tc1 = tc1; |
| 1078 | tz->tc2 = tc2; |
| 1079 | tz->passive_delay = passive_delay; |
| 1080 | tz->polling_delay = polling_delay; |
| 1081 | |
Kay Sievers | 354655e | 2009-01-06 10:44:37 -0800 | [diff] [blame] | 1082 | dev_set_name(&tz->device, "thermal_zone%d", tz->id); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1083 | result = device_register(&tz->device); |
| 1084 | if (result) { |
| 1085 | release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id); |
| 1086 | kfree(tz); |
Thomas Sujith | 3e6fda5 | 2008-02-15 00:59:50 -0500 | [diff] [blame] | 1087 | return ERR_PTR(result); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1088 | } |
| 1089 | |
| 1090 | /* sys I/F */ |
| 1091 | if (type) { |
| 1092 | result = device_create_file(&tz->device, &dev_attr_type); |
| 1093 | if (result) |
| 1094 | goto unregister; |
| 1095 | } |
| 1096 | |
| 1097 | result = device_create_file(&tz->device, &dev_attr_temp); |
| 1098 | if (result) |
| 1099 | goto unregister; |
| 1100 | |
| 1101 | if (ops->get_mode) { |
| 1102 | result = device_create_file(&tz->device, &dev_attr_mode); |
| 1103 | if (result) |
| 1104 | goto unregister; |
| 1105 | } |
| 1106 | |
| 1107 | for (count = 0; count < trips; count++) { |
| 1108 | TRIP_POINT_ATTR_ADD(&tz->device, count, result); |
| 1109 | if (result) |
| 1110 | goto unregister; |
Matthew Garrett | 03a971a | 2008-12-03 18:00:38 +0000 | [diff] [blame] | 1111 | tz->ops->get_trip_type(tz, count, &trip_type); |
| 1112 | if (trip_type == THERMAL_TRIP_PASSIVE) |
| 1113 | passive = 1; |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1114 | } |
| 1115 | |
Matthew Garrett | 03a971a | 2008-12-03 18:00:38 +0000 | [diff] [blame] | 1116 | if (!passive) |
| 1117 | result = device_create_file(&tz->device, |
| 1118 | &dev_attr_passive); |
| 1119 | |
| 1120 | if (result) |
| 1121 | goto unregister; |
| 1122 | |
Zhang Rui | e68b16a | 2008-04-21 16:07:52 +0800 | [diff] [blame] | 1123 | result = thermal_add_hwmon_sysfs(tz); |
| 1124 | if (result) |
| 1125 | goto unregister; |
| 1126 | |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1127 | mutex_lock(&thermal_list_lock); |
| 1128 | list_add_tail(&tz->node, &thermal_tz_list); |
| 1129 | if (ops->bind) |
| 1130 | list_for_each_entry(pos, &thermal_cdev_list, node) { |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 1131 | result = ops->bind(tz, pos); |
| 1132 | if (result) |
| 1133 | break; |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1134 | } |
| 1135 | mutex_unlock(&thermal_list_lock); |
| 1136 | |
Matthew Garrett | b1569e9 | 2008-12-03 17:55:32 +0000 | [diff] [blame] | 1137 | INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check); |
| 1138 | |
| 1139 | thermal_zone_device_update(tz); |
| 1140 | |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1141 | if (!result) |
| 1142 | return tz; |
| 1143 | |
| 1144 | unregister: |
| 1145 | release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id); |
| 1146 | device_unregister(&tz->device); |
Thomas Sujith | 3e6fda5 | 2008-02-15 00:59:50 -0500 | [diff] [blame] | 1147 | return ERR_PTR(result); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1148 | } |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 1149 | |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1150 | EXPORT_SYMBOL(thermal_zone_device_register); |
| 1151 | |
| 1152 | /** |
| 1153 | * thermal_device_unregister - removes the registered thermal zone device |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1154 | * @tz: the thermal zone device to remove |
| 1155 | */ |
| 1156 | void thermal_zone_device_unregister(struct thermal_zone_device *tz) |
| 1157 | { |
| 1158 | struct thermal_cooling_device *cdev; |
| 1159 | struct thermal_zone_device *pos = NULL; |
| 1160 | int count; |
| 1161 | |
| 1162 | if (!tz) |
| 1163 | return; |
| 1164 | |
| 1165 | mutex_lock(&thermal_list_lock); |
| 1166 | list_for_each_entry(pos, &thermal_tz_list, node) |
| 1167 | if (pos == tz) |
| 1168 | break; |
| 1169 | if (pos != tz) { |
| 1170 | /* thermal zone device not found */ |
| 1171 | mutex_unlock(&thermal_list_lock); |
| 1172 | return; |
| 1173 | } |
| 1174 | list_del(&tz->node); |
| 1175 | if (tz->ops->unbind) |
| 1176 | list_for_each_entry(cdev, &thermal_cdev_list, node) |
| 1177 | tz->ops->unbind(tz, cdev); |
| 1178 | mutex_unlock(&thermal_list_lock); |
| 1179 | |
Matthew Garrett | b1569e9 | 2008-12-03 17:55:32 +0000 | [diff] [blame] | 1180 | thermal_zone_device_set_polling(tz, 0); |
| 1181 | |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1182 | if (tz->type[0]) |
| 1183 | device_remove_file(&tz->device, &dev_attr_type); |
| 1184 | device_remove_file(&tz->device, &dev_attr_temp); |
| 1185 | if (tz->ops->get_mode) |
| 1186 | device_remove_file(&tz->device, &dev_attr_mode); |
| 1187 | |
| 1188 | for (count = 0; count < tz->trips; count++) |
| 1189 | TRIP_POINT_ATTR_REMOVE(&tz->device, count); |
| 1190 | |
Zhang Rui | e68b16a | 2008-04-21 16:07:52 +0800 | [diff] [blame] | 1191 | thermal_remove_hwmon_sysfs(tz); |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1192 | release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id); |
| 1193 | idr_destroy(&tz->idr); |
| 1194 | mutex_destroy(&tz->lock); |
| 1195 | device_unregister(&tz->device); |
| 1196 | return; |
| 1197 | } |
Len Brown | 543a956 | 2008-02-07 16:55:08 -0500 | [diff] [blame] | 1198 | |
Zhang Rui | 203d3d4 | 2008-01-17 15:51:08 +0800 | [diff] [blame] | 1199 | EXPORT_SYMBOL(thermal_zone_device_unregister); |
| 1200 | |
| 1201 | static int __init thermal_init(void) |
| 1202 | { |
| 1203 | int result = 0; |
| 1204 | |
| 1205 | result = class_register(&thermal_class); |
| 1206 | if (result) { |
| 1207 | idr_destroy(&thermal_tz_idr); |
| 1208 | idr_destroy(&thermal_cdev_idr); |
| 1209 | mutex_destroy(&thermal_idr_lock); |
| 1210 | mutex_destroy(&thermal_list_lock); |
| 1211 | } |
| 1212 | return result; |
| 1213 | } |
| 1214 | |
| 1215 | static void __exit thermal_exit(void) |
| 1216 | { |
| 1217 | class_unregister(&thermal_class); |
| 1218 | idr_destroy(&thermal_tz_idr); |
| 1219 | idr_destroy(&thermal_cdev_idr); |
| 1220 | mutex_destroy(&thermal_idr_lock); |
| 1221 | mutex_destroy(&thermal_list_lock); |
| 1222 | } |
| 1223 | |
| 1224 | subsys_initcall(thermal_init); |
| 1225 | module_exit(thermal_exit); |