Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 1 | /* |
| 2 | * Windfarm PowerMac thermal control. Core |
| 3 | * |
| 4 | * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. |
| 5 | * <benh@kernel.crashing.org> |
| 6 | * |
| 7 | * Released under the term of the GNU GPL v2. |
| 8 | * |
| 9 | * This core code tracks the list of sensors & controls, register |
| 10 | * clients, and holds the kernel thread used for control. |
| 11 | * |
| 12 | * TODO: |
| 13 | * |
| 14 | * Add some information about sensor/control type and data format to |
| 15 | * sensors/controls, and have the sysfs attribute stuff be moved |
| 16 | * generically here instead of hard coded in the platform specific |
| 17 | * driver as it us currently |
| 18 | * |
| 19 | * This however requires solving some annoying lifetime issues with |
| 20 | * sysfs which doesn't seem to have lifetime rules for struct attribute, |
| 21 | * I may have to create full features kobjects for every sensor/control |
| 22 | * instead which is a bit of an overkill imho |
| 23 | */ |
| 24 | |
| 25 | #include <linux/types.h> |
| 26 | #include <linux/errno.h> |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/spinlock.h> |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 30 | #include <linux/kthread.h> |
| 31 | #include <linux/jiffies.h> |
| 32 | #include <linux/reboot.h> |
| 33 | #include <linux/device.h> |
| 34 | #include <linux/platform_device.h> |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 35 | #include <linux/mutex.h> |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 36 | #include <linux/freezer.h> |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 37 | |
Benjamin Herrenschmidt | b55fafc | 2006-03-03 17:03:21 +1100 | [diff] [blame] | 38 | #include <asm/prom.h> |
| 39 | |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 40 | #include "windfarm.h" |
| 41 | |
| 42 | #define VERSION "0.2" |
| 43 | |
| 44 | #undef DEBUG |
| 45 | |
| 46 | #ifdef DEBUG |
| 47 | #define DBG(args...) printk(args) |
| 48 | #else |
| 49 | #define DBG(args...) do { } while(0) |
| 50 | #endif |
| 51 | |
| 52 | static LIST_HEAD(wf_controls); |
| 53 | static LIST_HEAD(wf_sensors); |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 54 | static DEFINE_MUTEX(wf_lock); |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 55 | static BLOCKING_NOTIFIER_HEAD(wf_client_list); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 56 | static int wf_client_count; |
| 57 | static unsigned int wf_overtemp; |
| 58 | static unsigned int wf_overtemp_counter; |
| 59 | struct task_struct *wf_thread; |
| 60 | |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 61 | static struct platform_device wf_platform_device = { |
| 62 | .name = "windfarm", |
| 63 | }; |
| 64 | |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 65 | /* |
| 66 | * Utilities & tick thread |
| 67 | */ |
| 68 | |
| 69 | static inline void wf_notify(int event, void *param) |
| 70 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 71 | blocking_notifier_call_chain(&wf_client_list, event, param); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | int wf_critical_overtemp(void) |
| 75 | { |
| 76 | static char * critical_overtemp_path = "/sbin/critical_overtemp"; |
| 77 | char *argv[] = { critical_overtemp_path, NULL }; |
| 78 | static char *envp[] = { "HOME=/", |
| 79 | "TERM=linux", |
| 80 | "PATH=/sbin:/usr/sbin:/bin:/usr/bin", |
| 81 | NULL }; |
| 82 | |
| 83 | return call_usermodehelper(critical_overtemp_path, argv, envp, 0); |
| 84 | } |
| 85 | EXPORT_SYMBOL_GPL(wf_critical_overtemp); |
| 86 | |
| 87 | static int wf_thread_func(void *data) |
| 88 | { |
| 89 | unsigned long next, delay; |
| 90 | |
| 91 | next = jiffies; |
| 92 | |
| 93 | DBG("wf: thread started\n"); |
| 94 | |
| 95 | while(!kthread_should_stop()) { |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 96 | if (time_after_eq(jiffies, next)) { |
| 97 | wf_notify(WF_EVENT_TICK, NULL); |
| 98 | if (wf_overtemp) { |
| 99 | wf_overtemp_counter++; |
| 100 | /* 10 seconds overtemp, notify userland */ |
| 101 | if (wf_overtemp_counter > 10) |
| 102 | wf_critical_overtemp(); |
| 103 | /* 30 seconds, shutdown */ |
| 104 | if (wf_overtemp_counter > 30) { |
| 105 | printk(KERN_ERR "windfarm: Overtemp " |
| 106 | "for more than 30" |
| 107 | " seconds, shutting down\n"); |
| 108 | machine_power_off(); |
| 109 | } |
| 110 | } |
| 111 | next += HZ; |
| 112 | } |
| 113 | |
| 114 | delay = next - jiffies; |
| 115 | if (delay <= HZ) |
| 116 | schedule_timeout_interruptible(delay); |
| 117 | |
Johannes Berg | 1ed2ddf | 2007-02-05 19:30:29 +0100 | [diff] [blame] | 118 | /* there should be no non-suspend signal, but oh well */ |
| 119 | if (signal_pending(current) && !try_to_freeze()) { |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 120 | printk(KERN_WARNING "windfarm: thread got sigl !\n"); |
| 121 | break; |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | DBG("wf: thread stopped\n"); |
| 126 | |
| 127 | return 0; |
| 128 | } |
| 129 | |
| 130 | static void wf_start_thread(void) |
| 131 | { |
| 132 | wf_thread = kthread_run(wf_thread_func, NULL, "kwindfarm"); |
| 133 | if (IS_ERR(wf_thread)) { |
| 134 | printk(KERN_ERR "windfarm: failed to create thread,err %ld\n", |
| 135 | PTR_ERR(wf_thread)); |
| 136 | wf_thread = NULL; |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | |
| 141 | static void wf_stop_thread(void) |
| 142 | { |
| 143 | if (wf_thread) |
| 144 | kthread_stop(wf_thread); |
| 145 | wf_thread = NULL; |
| 146 | } |
| 147 | |
| 148 | /* |
| 149 | * Controls |
| 150 | */ |
| 151 | |
| 152 | static void wf_control_release(struct kref *kref) |
| 153 | { |
| 154 | struct wf_control *ct = container_of(kref, struct wf_control, ref); |
| 155 | |
| 156 | DBG("wf: Deleting control %s\n", ct->name); |
| 157 | |
| 158 | if (ct->ops && ct->ops->release) |
| 159 | ct->ops->release(ct); |
| 160 | else |
| 161 | kfree(ct); |
| 162 | } |
| 163 | |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 164 | static ssize_t wf_show_control(struct device *dev, |
| 165 | struct device_attribute *attr, char *buf) |
| 166 | { |
| 167 | struct wf_control *ctrl = container_of(attr, struct wf_control, attr); |
| 168 | s32 val = 0; |
| 169 | int err; |
| 170 | |
| 171 | err = ctrl->ops->get_value(ctrl, &val); |
| 172 | if (err < 0) |
| 173 | return err; |
| 174 | return sprintf(buf, "%d\n", val); |
| 175 | } |
| 176 | |
| 177 | /* This is really only for debugging... */ |
| 178 | static ssize_t wf_store_control(struct device *dev, |
| 179 | struct device_attribute *attr, |
| 180 | const char *buf, size_t count) |
| 181 | { |
| 182 | struct wf_control *ctrl = container_of(attr, struct wf_control, attr); |
| 183 | int val; |
| 184 | int err; |
| 185 | char *endp; |
| 186 | |
| 187 | val = simple_strtoul(buf, &endp, 0); |
| 188 | while (endp < buf + count && (*endp == ' ' || *endp == '\n')) |
| 189 | ++endp; |
| 190 | if (endp - buf < count) |
| 191 | return -EINVAL; |
| 192 | err = ctrl->ops->set_value(ctrl, val); |
| 193 | if (err < 0) |
| 194 | return err; |
| 195 | return count; |
| 196 | } |
| 197 | |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 198 | int wf_register_control(struct wf_control *new_ct) |
| 199 | { |
| 200 | struct wf_control *ct; |
| 201 | |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 202 | mutex_lock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 203 | list_for_each_entry(ct, &wf_controls, link) { |
| 204 | if (!strcmp(ct->name, new_ct->name)) { |
| 205 | printk(KERN_WARNING "windfarm: trying to register" |
| 206 | " duplicate control %s\n", ct->name); |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 207 | mutex_unlock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 208 | return -EEXIST; |
| 209 | } |
| 210 | } |
| 211 | kref_init(&new_ct->ref); |
| 212 | list_add(&new_ct->link, &wf_controls); |
| 213 | |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 214 | new_ct->attr.attr.name = new_ct->name; |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 215 | new_ct->attr.attr.mode = 0644; |
| 216 | new_ct->attr.show = wf_show_control; |
| 217 | new_ct->attr.store = wf_store_control; |
Stephen Rothwell | ccd308f | 2007-05-17 11:22:15 +1000 | [diff] [blame] | 218 | if (device_create_file(&wf_platform_device.dev, &new_ct->attr)) |
| 219 | printk(KERN_WARNING "windfarm: device_create_file failed" |
| 220 | " for %s\n", new_ct->name); |
| 221 | /* the subsystem still does useful work without the file */ |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 222 | |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 223 | DBG("wf: Registered control %s\n", new_ct->name); |
| 224 | |
| 225 | wf_notify(WF_EVENT_NEW_CONTROL, new_ct); |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 226 | mutex_unlock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 227 | |
| 228 | return 0; |
| 229 | } |
| 230 | EXPORT_SYMBOL_GPL(wf_register_control); |
| 231 | |
| 232 | void wf_unregister_control(struct wf_control *ct) |
| 233 | { |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 234 | mutex_lock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 235 | list_del(&ct->link); |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 236 | mutex_unlock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 237 | |
| 238 | DBG("wf: Unregistered control %s\n", ct->name); |
| 239 | |
| 240 | kref_put(&ct->ref, wf_control_release); |
| 241 | } |
| 242 | EXPORT_SYMBOL_GPL(wf_unregister_control); |
| 243 | |
| 244 | struct wf_control * wf_find_control(const char *name) |
| 245 | { |
| 246 | struct wf_control *ct; |
| 247 | |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 248 | mutex_lock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 249 | list_for_each_entry(ct, &wf_controls, link) { |
| 250 | if (!strcmp(ct->name, name)) { |
| 251 | if (wf_get_control(ct)) |
| 252 | ct = NULL; |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 253 | mutex_unlock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 254 | return ct; |
| 255 | } |
| 256 | } |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 257 | mutex_unlock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 258 | return NULL; |
| 259 | } |
| 260 | EXPORT_SYMBOL_GPL(wf_find_control); |
| 261 | |
| 262 | int wf_get_control(struct wf_control *ct) |
| 263 | { |
| 264 | if (!try_module_get(ct->ops->owner)) |
| 265 | return -ENODEV; |
| 266 | kref_get(&ct->ref); |
| 267 | return 0; |
| 268 | } |
| 269 | EXPORT_SYMBOL_GPL(wf_get_control); |
| 270 | |
| 271 | void wf_put_control(struct wf_control *ct) |
| 272 | { |
| 273 | struct module *mod = ct->ops->owner; |
| 274 | kref_put(&ct->ref, wf_control_release); |
| 275 | module_put(mod); |
| 276 | } |
| 277 | EXPORT_SYMBOL_GPL(wf_put_control); |
| 278 | |
| 279 | |
| 280 | /* |
| 281 | * Sensors |
| 282 | */ |
| 283 | |
| 284 | |
| 285 | static void wf_sensor_release(struct kref *kref) |
| 286 | { |
| 287 | struct wf_sensor *sr = container_of(kref, struct wf_sensor, ref); |
| 288 | |
| 289 | DBG("wf: Deleting sensor %s\n", sr->name); |
| 290 | |
| 291 | if (sr->ops && sr->ops->release) |
| 292 | sr->ops->release(sr); |
| 293 | else |
| 294 | kfree(sr); |
| 295 | } |
| 296 | |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 297 | static ssize_t wf_show_sensor(struct device *dev, |
| 298 | struct device_attribute *attr, char *buf) |
| 299 | { |
| 300 | struct wf_sensor *sens = container_of(attr, struct wf_sensor, attr); |
| 301 | s32 val = 0; |
| 302 | int err; |
| 303 | |
| 304 | err = sens->ops->get_value(sens, &val); |
| 305 | if (err < 0) |
| 306 | return err; |
| 307 | return sprintf(buf, "%d.%03d\n", FIX32TOPRINT(val)); |
| 308 | } |
| 309 | |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 310 | int wf_register_sensor(struct wf_sensor *new_sr) |
| 311 | { |
| 312 | struct wf_sensor *sr; |
| 313 | |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 314 | mutex_lock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 315 | list_for_each_entry(sr, &wf_sensors, link) { |
| 316 | if (!strcmp(sr->name, new_sr->name)) { |
| 317 | printk(KERN_WARNING "windfarm: trying to register" |
| 318 | " duplicate sensor %s\n", sr->name); |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 319 | mutex_unlock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 320 | return -EEXIST; |
| 321 | } |
| 322 | } |
| 323 | kref_init(&new_sr->ref); |
| 324 | list_add(&new_sr->link, &wf_sensors); |
| 325 | |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 326 | new_sr->attr.attr.name = new_sr->name; |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 327 | new_sr->attr.attr.mode = 0444; |
| 328 | new_sr->attr.show = wf_show_sensor; |
| 329 | new_sr->attr.store = NULL; |
Stephen Rothwell | ccd308f | 2007-05-17 11:22:15 +1000 | [diff] [blame] | 330 | if (device_create_file(&wf_platform_device.dev, &new_sr->attr)) |
| 331 | printk(KERN_WARNING "windfarm: device_create_file failed" |
| 332 | " for %s\n", new_sr->name); |
| 333 | /* the subsystem still does useful work without the file */ |
Benjamin Herrenschmidt | ac171c4 | 2006-02-08 16:42:51 +1100 | [diff] [blame] | 334 | |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 335 | DBG("wf: Registered sensor %s\n", new_sr->name); |
| 336 | |
| 337 | wf_notify(WF_EVENT_NEW_SENSOR, new_sr); |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 338 | mutex_unlock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 339 | |
| 340 | return 0; |
| 341 | } |
| 342 | EXPORT_SYMBOL_GPL(wf_register_sensor); |
| 343 | |
| 344 | void wf_unregister_sensor(struct wf_sensor *sr) |
| 345 | { |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 346 | mutex_lock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 347 | list_del(&sr->link); |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 348 | mutex_unlock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 349 | |
| 350 | DBG("wf: Unregistered sensor %s\n", sr->name); |
| 351 | |
| 352 | wf_put_sensor(sr); |
| 353 | } |
| 354 | EXPORT_SYMBOL_GPL(wf_unregister_sensor); |
| 355 | |
| 356 | struct wf_sensor * wf_find_sensor(const char *name) |
| 357 | { |
| 358 | struct wf_sensor *sr; |
| 359 | |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 360 | mutex_lock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 361 | list_for_each_entry(sr, &wf_sensors, link) { |
| 362 | if (!strcmp(sr->name, name)) { |
| 363 | if (wf_get_sensor(sr)) |
| 364 | sr = NULL; |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 365 | mutex_unlock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 366 | return sr; |
| 367 | } |
| 368 | } |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 369 | mutex_unlock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 370 | return NULL; |
| 371 | } |
| 372 | EXPORT_SYMBOL_GPL(wf_find_sensor); |
| 373 | |
| 374 | int wf_get_sensor(struct wf_sensor *sr) |
| 375 | { |
| 376 | if (!try_module_get(sr->ops->owner)) |
| 377 | return -ENODEV; |
| 378 | kref_get(&sr->ref); |
| 379 | return 0; |
| 380 | } |
| 381 | EXPORT_SYMBOL_GPL(wf_get_sensor); |
| 382 | |
| 383 | void wf_put_sensor(struct wf_sensor *sr) |
| 384 | { |
| 385 | struct module *mod = sr->ops->owner; |
| 386 | kref_put(&sr->ref, wf_sensor_release); |
| 387 | module_put(mod); |
| 388 | } |
| 389 | EXPORT_SYMBOL_GPL(wf_put_sensor); |
| 390 | |
| 391 | |
| 392 | /* |
| 393 | * Client & notification |
| 394 | */ |
| 395 | |
| 396 | int wf_register_client(struct notifier_block *nb) |
| 397 | { |
| 398 | int rc; |
| 399 | struct wf_control *ct; |
| 400 | struct wf_sensor *sr; |
| 401 | |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 402 | mutex_lock(&wf_lock); |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 403 | rc = blocking_notifier_chain_register(&wf_client_list, nb); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 404 | if (rc != 0) |
| 405 | goto bail; |
| 406 | wf_client_count++; |
| 407 | list_for_each_entry(ct, &wf_controls, link) |
| 408 | wf_notify(WF_EVENT_NEW_CONTROL, ct); |
| 409 | list_for_each_entry(sr, &wf_sensors, link) |
| 410 | wf_notify(WF_EVENT_NEW_SENSOR, sr); |
| 411 | if (wf_client_count == 1) |
| 412 | wf_start_thread(); |
| 413 | bail: |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 414 | mutex_unlock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 415 | return rc; |
| 416 | } |
| 417 | EXPORT_SYMBOL_GPL(wf_register_client); |
| 418 | |
| 419 | int wf_unregister_client(struct notifier_block *nb) |
| 420 | { |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 421 | mutex_lock(&wf_lock); |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 422 | blocking_notifier_chain_unregister(&wf_client_list, nb); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 423 | wf_client_count++; |
| 424 | if (wf_client_count == 0) |
| 425 | wf_stop_thread(); |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 426 | mutex_unlock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 427 | |
| 428 | return 0; |
| 429 | } |
| 430 | EXPORT_SYMBOL_GPL(wf_unregister_client); |
| 431 | |
| 432 | void wf_set_overtemp(void) |
| 433 | { |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 434 | mutex_lock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 435 | wf_overtemp++; |
| 436 | if (wf_overtemp == 1) { |
| 437 | printk(KERN_WARNING "windfarm: Overtemp condition detected !\n"); |
| 438 | wf_overtemp_counter = 0; |
| 439 | wf_notify(WF_EVENT_OVERTEMP, NULL); |
| 440 | } |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 441 | mutex_unlock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 442 | } |
| 443 | EXPORT_SYMBOL_GPL(wf_set_overtemp); |
| 444 | |
| 445 | void wf_clear_overtemp(void) |
| 446 | { |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 447 | mutex_lock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 448 | WARN_ON(wf_overtemp == 0); |
| 449 | if (wf_overtemp == 0) { |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 450 | mutex_unlock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 451 | return; |
| 452 | } |
| 453 | wf_overtemp--; |
| 454 | if (wf_overtemp == 0) { |
| 455 | printk(KERN_WARNING "windfarm: Overtemp condition cleared !\n"); |
| 456 | wf_notify(WF_EVENT_NORMALTEMP, NULL); |
| 457 | } |
Ingo Molnar | 837e959 | 2006-01-14 16:18:45 +0100 | [diff] [blame] | 458 | mutex_unlock(&wf_lock); |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 459 | } |
| 460 | EXPORT_SYMBOL_GPL(wf_clear_overtemp); |
| 461 | |
| 462 | int wf_is_overtemp(void) |
| 463 | { |
| 464 | return (wf_overtemp != 0); |
| 465 | } |
| 466 | EXPORT_SYMBOL_GPL(wf_is_overtemp); |
| 467 | |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 468 | static int __init windfarm_core_init(void) |
| 469 | { |
| 470 | DBG("wf: core loaded\n"); |
| 471 | |
Benjamin Herrenschmidt | b55fafc | 2006-03-03 17:03:21 +1100 | [diff] [blame] | 472 | /* Don't register on old machines that use therm_pm72 for now */ |
| 473 | if (machine_is_compatible("PowerMac7,2") || |
| 474 | machine_is_compatible("PowerMac7,3") || |
| 475 | machine_is_compatible("RackMac3,1")) |
| 476 | return -ENODEV; |
Benjamin Herrenschmidt | 75722d3 | 2005-11-07 16:08:17 +1100 | [diff] [blame] | 477 | platform_device_register(&wf_platform_device); |
| 478 | return 0; |
| 479 | } |
| 480 | |
| 481 | static void __exit windfarm_core_exit(void) |
| 482 | { |
| 483 | BUG_ON(wf_client_count != 0); |
| 484 | |
| 485 | DBG("wf: core unloaded\n"); |
| 486 | |
| 487 | platform_device_unregister(&wf_platform_device); |
| 488 | } |
| 489 | |
| 490 | |
| 491 | module_init(windfarm_core_init); |
| 492 | module_exit(windfarm_core_exit); |
| 493 | |
| 494 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); |
| 495 | MODULE_DESCRIPTION("Core component of PowerMac thermal control"); |
| 496 | MODULE_LICENSE("GPL"); |
| 497 | |