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1da177e4 LT |
1 | /* |
2 | * acpi_fan.c - ACPI Fan Driver ($Revision: 29 $) | |
3 | * | |
4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> | |
5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> | |
6 | * | |
7 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or (at | |
12 | * your option) any later version. | |
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 | * | |
1da177e4 LT |
19 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
20 | */ | |
21 | ||
22 | #include <linux/kernel.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/types.h> | |
88989fd2 | 26 | #include <linux/uaccess.h> |
05a83d97 | 27 | #include <linux/thermal.h> |
8b48463f | 28 | #include <linux/acpi.h> |
19593a1f | 29 | #include <linux/platform_device.h> |
9519a635 | 30 | #include <linux/sort.h> |
1da177e4 | 31 | |
f52fd66d | 32 | MODULE_AUTHOR("Paul Diefenbaugh"); |
7cda93e0 | 33 | MODULE_DESCRIPTION("ACPI Fan Driver"); |
1da177e4 LT |
34 | MODULE_LICENSE("GPL"); |
35 | ||
19593a1f AL |
36 | static int acpi_fan_probe(struct platform_device *pdev); |
37 | static int acpi_fan_remove(struct platform_device *pdev); | |
1da177e4 | 38 | |
1ba90e3a TR |
39 | static const struct acpi_device_id fan_device_ids[] = { |
40 | {"PNP0C0B", 0}, | |
d806c6e9 | 41 | {"INT3404", 0}, |
1ba90e3a TR |
42 | {"", 0}, |
43 | }; | |
44 | MODULE_DEVICE_TABLE(acpi, fan_device_ids); | |
45 | ||
90692404 | 46 | #ifdef CONFIG_PM_SLEEP |
62fcbdd9 RW |
47 | static int acpi_fan_suspend(struct device *dev); |
48 | static int acpi_fan_resume(struct device *dev); | |
b9b8515f AL |
49 | static struct dev_pm_ops acpi_fan_pm = { |
50 | .resume = acpi_fan_resume, | |
51 | .freeze = acpi_fan_suspend, | |
52 | .thaw = acpi_fan_resume, | |
53 | .restore = acpi_fan_resume, | |
54 | }; | |
55 | #define FAN_PM_OPS_PTR (&acpi_fan_pm) | |
b108e0ea | 56 | #else |
b9b8515f | 57 | #define FAN_PM_OPS_PTR NULL |
90692404 | 58 | #endif |
62fcbdd9 | 59 | |
9519a635 AL |
60 | struct acpi_fan_fps { |
61 | u64 control; | |
62 | u64 trip_point; | |
63 | u64 speed; | |
64 | u64 noise_level; | |
65 | u64 power; | |
66 | }; | |
67 | ||
68 | struct acpi_fan_fif { | |
69 | u64 revision; | |
70 | u64 fine_grain_ctrl; | |
71 | u64 step_size; | |
72 | u64 low_speed_notification; | |
73 | }; | |
74 | ||
75 | struct acpi_fan { | |
76 | bool acpi4; | |
77 | struct acpi_fan_fif fif; | |
78 | struct acpi_fan_fps *fps; | |
79 | int fps_count; | |
80 | struct thermal_cooling_device *cdev; | |
81 | }; | |
82 | ||
19593a1f AL |
83 | static struct platform_driver acpi_fan_driver = { |
84 | .probe = acpi_fan_probe, | |
85 | .remove = acpi_fan_remove, | |
86 | .driver = { | |
87 | .name = "acpi-fan", | |
88 | .acpi_match_table = fan_device_ids, | |
89 | .pm = FAN_PM_OPS_PTR, | |
90 | }, | |
1da177e4 LT |
91 | }; |
92 | ||
05a83d97 | 93 | /* thermal cooling device callbacks */ |
6503e5df MG |
94 | static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long |
95 | *state) | |
05a83d97 | 96 | { |
9519a635 AL |
97 | struct acpi_device *device = cdev->devdata; |
98 | struct acpi_fan *fan = acpi_driver_data(device); | |
99 | ||
100 | if (fan->acpi4) | |
101 | *state = fan->fps_count - 1; | |
102 | else | |
103 | *state = 1; | |
6503e5df | 104 | return 0; |
05a83d97 ZR |
105 | } |
106 | ||
9519a635 AL |
107 | static int fan_get_state_acpi4(struct acpi_device *device, unsigned long *state) |
108 | { | |
109 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
110 | struct acpi_fan *fan = acpi_driver_data(device); | |
111 | union acpi_object *obj; | |
112 | acpi_status status; | |
113 | int control, i; | |
114 | ||
115 | status = acpi_evaluate_object(device->handle, "_FST", NULL, &buffer); | |
116 | if (ACPI_FAILURE(status)) { | |
117 | dev_err(&device->dev, "Get fan state failed\n"); | |
118 | return status; | |
119 | } | |
120 | ||
121 | obj = buffer.pointer; | |
122 | if (!obj || obj->type != ACPI_TYPE_PACKAGE || | |
123 | obj->package.count != 3 || | |
124 | obj->package.elements[1].type != ACPI_TYPE_INTEGER) { | |
125 | dev_err(&device->dev, "Invalid _FST data\n"); | |
126 | status = -EINVAL; | |
127 | goto err; | |
128 | } | |
129 | ||
130 | control = obj->package.elements[1].integer.value; | |
131 | for (i = 0; i < fan->fps_count; i++) { | |
132 | if (control == fan->fps[i].control) | |
133 | break; | |
134 | } | |
135 | if (i == fan->fps_count) { | |
136 | dev_dbg(&device->dev, "Invalid control value returned\n"); | |
137 | status = -EINVAL; | |
138 | goto err; | |
139 | } | |
140 | ||
141 | *state = i; | |
142 | ||
143 | err: | |
144 | kfree(obj); | |
145 | return status; | |
146 | } | |
147 | ||
148 | static int fan_get_state(struct acpi_device *device, unsigned long *state) | |
05a83d97 | 149 | { |
05a83d97 | 150 | int result; |
85eb9827 | 151 | int acpi_state = ACPI_STATE_D0; |
05a83d97 | 152 | |
2bb3a2bf | 153 | result = acpi_device_update_power(device, &acpi_state); |
05a83d97 ZR |
154 | if (result) |
155 | return result; | |
156 | ||
20dacb71 RW |
157 | *state = acpi_state == ACPI_STATE_D3_COLD |
158 | || acpi_state == ACPI_STATE_D3_HOT ? | |
159 | 0 : (acpi_state == ACPI_STATE_D0 ? 1 : -1); | |
6503e5df | 160 | return 0; |
05a83d97 ZR |
161 | } |
162 | ||
9519a635 AL |
163 | static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long |
164 | *state) | |
05a83d97 ZR |
165 | { |
166 | struct acpi_device *device = cdev->devdata; | |
9519a635 | 167 | struct acpi_fan *fan = acpi_driver_data(device); |
05a83d97 | 168 | |
9519a635 AL |
169 | if (fan->acpi4) |
170 | return fan_get_state_acpi4(device, state); | |
171 | else | |
172 | return fan_get_state(device, state); | |
173 | } | |
05a83d97 | 174 | |
9519a635 AL |
175 | static int fan_set_state(struct acpi_device *device, unsigned long state) |
176 | { | |
177 | if (state != 0 && state != 1) | |
05a83d97 ZR |
178 | return -EINVAL; |
179 | ||
9519a635 AL |
180 | return acpi_device_set_power(device, |
181 | state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD); | |
182 | } | |
05a83d97 | 183 | |
9519a635 AL |
184 | static int fan_set_state_acpi4(struct acpi_device *device, unsigned long state) |
185 | { | |
186 | struct acpi_fan *fan = acpi_driver_data(device); | |
187 | acpi_status status; | |
188 | ||
189 | if (state >= fan->fps_count) | |
190 | return -EINVAL; | |
191 | ||
192 | status = acpi_execute_simple_method(device->handle, "_FSL", | |
193 | fan->fps[state].control); | |
194 | if (ACPI_FAILURE(status)) { | |
195 | dev_dbg(&device->dev, "Failed to set state by _FSL\n"); | |
196 | return status; | |
197 | } | |
198 | ||
199 | return 0; | |
05a83d97 ZR |
200 | } |
201 | ||
9519a635 AL |
202 | static int |
203 | fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) | |
204 | { | |
205 | struct acpi_device *device = cdev->devdata; | |
206 | struct acpi_fan *fan = acpi_driver_data(device); | |
207 | ||
208 | if (fan->acpi4) | |
209 | return fan_set_state_acpi4(device, state); | |
210 | else | |
211 | return fan_set_state(device, state); | |
212 | } | |
213 | ||
9c8b04be | 214 | static const struct thermal_cooling_device_ops fan_cooling_ops = { |
05a83d97 ZR |
215 | .get_max_state = fan_get_max_state, |
216 | .get_cur_state = fan_get_cur_state, | |
217 | .set_cur_state = fan_set_cur_state, | |
218 | }; | |
219 | ||
1da177e4 | 220 | /* -------------------------------------------------------------------------- |
88989fd2 SM |
221 | * Driver Interface |
222 | * -------------------------------------------------------------------------- | |
223 | */ | |
1da177e4 | 224 | |
9519a635 | 225 | static bool acpi_fan_is_acpi4(struct acpi_device *device) |
1da177e4 | 226 | { |
9519a635 AL |
227 | return acpi_has_method(device->handle, "_FIF") && |
228 | acpi_has_method(device->handle, "_FPS") && | |
229 | acpi_has_method(device->handle, "_FSL") && | |
230 | acpi_has_method(device->handle, "_FST"); | |
231 | } | |
1da177e4 | 232 | |
9519a635 AL |
233 | static int acpi_fan_get_fif(struct acpi_device *device) |
234 | { | |
235 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
236 | struct acpi_fan *fan = acpi_driver_data(device); | |
237 | struct acpi_buffer format = { sizeof("NNNN"), "NNNN" }; | |
238 | struct acpi_buffer fif = { sizeof(fan->fif), &fan->fif }; | |
239 | union acpi_object *obj; | |
240 | acpi_status status; | |
241 | ||
242 | status = acpi_evaluate_object(device->handle, "_FIF", NULL, &buffer); | |
243 | if (ACPI_FAILURE(status)) | |
244 | return status; | |
245 | ||
246 | obj = buffer.pointer; | |
247 | if (!obj || obj->type != ACPI_TYPE_PACKAGE) { | |
248 | dev_err(&device->dev, "Invalid _FIF data\n"); | |
249 | status = -EINVAL; | |
250 | goto err; | |
251 | } | |
1da177e4 | 252 | |
9519a635 AL |
253 | status = acpi_extract_package(obj, &format, &fif); |
254 | if (ACPI_FAILURE(status)) { | |
255 | dev_err(&device->dev, "Invalid _FIF element\n"); | |
256 | status = -EINVAL; | |
257 | } | |
1da177e4 | 258 | |
9519a635 AL |
259 | err: |
260 | kfree(obj); | |
261 | return status; | |
262 | } | |
263 | ||
264 | static int acpi_fan_speed_cmp(const void *a, const void *b) | |
265 | { | |
266 | const struct acpi_fan_fps *fps1 = a; | |
267 | const struct acpi_fan_fps *fps2 = b; | |
268 | return fps1->speed - fps2->speed; | |
269 | } | |
270 | ||
271 | static int acpi_fan_get_fps(struct acpi_device *device) | |
272 | { | |
273 | struct acpi_fan *fan = acpi_driver_data(device); | |
274 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
275 | union acpi_object *obj; | |
276 | acpi_status status; | |
277 | int i; | |
278 | ||
279 | status = acpi_evaluate_object(device->handle, "_FPS", NULL, &buffer); | |
280 | if (ACPI_FAILURE(status)) | |
281 | return status; | |
282 | ||
283 | obj = buffer.pointer; | |
284 | if (!obj || obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) { | |
285 | dev_err(&device->dev, "Invalid _FPS data\n"); | |
286 | status = -EINVAL; | |
287 | goto err; | |
288 | } | |
289 | ||
290 | fan->fps_count = obj->package.count - 1; /* minus revision field */ | |
291 | fan->fps = devm_kzalloc(&device->dev, | |
292 | fan->fps_count * sizeof(struct acpi_fan_fps), | |
293 | GFP_KERNEL); | |
294 | if (!fan->fps) { | |
295 | dev_err(&device->dev, "Not enough memory\n"); | |
296 | status = -ENOMEM; | |
297 | goto err; | |
298 | } | |
299 | for (i = 0; i < fan->fps_count; i++) { | |
300 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
301 | struct acpi_buffer fps = { sizeof(fan->fps[i]), &fan->fps[i] }; | |
302 | status = acpi_extract_package(&obj->package.elements[i + 1], | |
303 | &format, &fps); | |
304 | if (ACPI_FAILURE(status)) { | |
305 | dev_err(&device->dev, "Invalid _FPS element\n"); | |
306 | break; | |
307 | } | |
308 | } | |
309 | ||
310 | /* sort the state array according to fan speed in increase order */ | |
311 | sort(fan->fps, fan->fps_count, sizeof(*fan->fps), | |
312 | acpi_fan_speed_cmp, NULL); | |
313 | ||
314 | err: | |
315 | kfree(obj); | |
316 | return status; | |
317 | } | |
318 | ||
19593a1f | 319 | static int acpi_fan_probe(struct platform_device *pdev) |
1da177e4 | 320 | { |
4be44fcd | 321 | int result = 0; |
05a83d97 | 322 | struct thermal_cooling_device *cdev; |
9519a635 | 323 | struct acpi_fan *fan; |
19593a1f | 324 | struct acpi_device *device = ACPI_COMPANION(&pdev->dev); |
bbb16fef | 325 | char *name; |
1da177e4 | 326 | |
9519a635 AL |
327 | fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL); |
328 | if (!fan) { | |
329 | dev_err(&device->dev, "No memory for fan\n"); | |
330 | return -ENOMEM; | |
331 | } | |
332 | device->driver_data = fan; | |
333 | platform_set_drvdata(pdev, fan); | |
334 | ||
335 | if (acpi_fan_is_acpi4(device)) { | |
336 | if (acpi_fan_get_fif(device) || acpi_fan_get_fps(device)) | |
337 | goto end; | |
338 | fan->acpi4 = true; | |
339 | } else { | |
340 | result = acpi_device_update_power(device, NULL); | |
341 | if (result) { | |
342 | dev_err(&device->dev, "Setting initial power state\n"); | |
343 | goto end; | |
344 | } | |
1da177e4 LT |
345 | } |
346 | ||
bbb16fef SP |
347 | if (!strncmp(pdev->name, "PNP0C0B", strlen("PNP0C0B"))) |
348 | name = "Fan"; | |
349 | else | |
350 | name = acpi_device_bid(device); | |
351 | ||
352 | cdev = thermal_cooling_device_register(name, device, | |
05a83d97 | 353 | &fan_cooling_ops); |
19b36780 TS |
354 | if (IS_ERR(cdev)) { |
355 | result = PTR_ERR(cdev); | |
356 | goto end; | |
357 | } | |
9030062f | 358 | |
19593a1f | 359 | dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id); |
9030062f | 360 | |
9519a635 | 361 | fan->cdev = cdev; |
19593a1f | 362 | result = sysfs_create_link(&pdev->dev.kobj, |
9030062f JL |
363 | &cdev->device.kobj, |
364 | "thermal_cooling"); | |
365 | if (result) | |
8264fce6 | 366 | dev_err(&pdev->dev, "Failed to create sysfs link 'thermal_cooling'\n"); |
9030062f JL |
367 | |
368 | result = sysfs_create_link(&cdev->device.kobj, | |
19593a1f | 369 | &pdev->dev.kobj, |
9030062f JL |
370 | "device"); |
371 | if (result) | |
8264fce6 | 372 | dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n"); |
1da177e4 | 373 | |
568b6ad8 | 374 | end: |
d550d98d | 375 | return result; |
1da177e4 LT |
376 | } |
377 | ||
19593a1f | 378 | static int acpi_fan_remove(struct platform_device *pdev) |
1da177e4 | 379 | { |
9519a635 | 380 | struct acpi_fan *fan = platform_get_drvdata(pdev); |
1da177e4 | 381 | |
19593a1f | 382 | sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling"); |
9519a635 AL |
383 | sysfs_remove_link(&fan->cdev->device.kobj, "device"); |
384 | thermal_cooling_device_unregister(fan->cdev); | |
1da177e4 | 385 | |
d550d98d | 386 | return 0; |
1da177e4 LT |
387 | } |
388 | ||
90692404 | 389 | #ifdef CONFIG_PM_SLEEP |
62fcbdd9 | 390 | static int acpi_fan_suspend(struct device *dev) |
ec68373c | 391 | { |
9519a635 AL |
392 | struct acpi_fan *fan = dev_get_drvdata(dev); |
393 | if (fan->acpi4) | |
394 | return 0; | |
ec68373c | 395 | |
19593a1f | 396 | acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0); |
ec68373c LB |
397 | |
398 | return AE_OK; | |
399 | } | |
400 | ||
62fcbdd9 | 401 | static int acpi_fan_resume(struct device *dev) |
ec68373c | 402 | { |
488a76c5 | 403 | int result; |
9519a635 | 404 | struct acpi_fan *fan = dev_get_drvdata(dev); |
ec68373c | 405 | |
9519a635 AL |
406 | if (fan->acpi4) |
407 | return 0; | |
ec68373c | 408 | |
19593a1f | 409 | result = acpi_device_update_power(ACPI_COMPANION(dev), NULL); |
488a76c5 | 410 | if (result) |
88989fd2 | 411 | dev_err(dev, "Error updating fan power state\n"); |
ec68373c LB |
412 | |
413 | return result; | |
414 | } | |
90692404 | 415 | #endif |
ec68373c | 416 | |
19593a1f | 417 | module_platform_driver(acpi_fan_driver); |