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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 | * | |
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/kernel.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/types.h> | |
88989fd2 | 30 | #include <linux/uaccess.h> |
05a83d97 | 31 | #include <linux/thermal.h> |
8b48463f | 32 | #include <linux/acpi.h> |
19593a1f | 33 | #include <linux/platform_device.h> |
9519a635 | 34 | #include <linux/sort.h> |
1da177e4 | 35 | |
f52fd66d | 36 | MODULE_AUTHOR("Paul Diefenbaugh"); |
7cda93e0 | 37 | MODULE_DESCRIPTION("ACPI Fan Driver"); |
1da177e4 LT |
38 | MODULE_LICENSE("GPL"); |
39 | ||
19593a1f AL |
40 | static int acpi_fan_probe(struct platform_device *pdev); |
41 | static int acpi_fan_remove(struct platform_device *pdev); | |
1da177e4 | 42 | |
1ba90e3a TR |
43 | static const struct acpi_device_id fan_device_ids[] = { |
44 | {"PNP0C0B", 0}, | |
d806c6e9 | 45 | {"INT3404", 0}, |
1ba90e3a TR |
46 | {"", 0}, |
47 | }; | |
48 | MODULE_DEVICE_TABLE(acpi, fan_device_ids); | |
49 | ||
90692404 | 50 | #ifdef CONFIG_PM_SLEEP |
62fcbdd9 RW |
51 | static int acpi_fan_suspend(struct device *dev); |
52 | static int acpi_fan_resume(struct device *dev); | |
b9b8515f AL |
53 | static struct dev_pm_ops acpi_fan_pm = { |
54 | .resume = acpi_fan_resume, | |
55 | .freeze = acpi_fan_suspend, | |
56 | .thaw = acpi_fan_resume, | |
57 | .restore = acpi_fan_resume, | |
58 | }; | |
59 | #define FAN_PM_OPS_PTR (&acpi_fan_pm) | |
b108e0ea | 60 | #else |
b9b8515f | 61 | #define FAN_PM_OPS_PTR NULL |
90692404 | 62 | #endif |
62fcbdd9 | 63 | |
9519a635 AL |
64 | struct acpi_fan_fps { |
65 | u64 control; | |
66 | u64 trip_point; | |
67 | u64 speed; | |
68 | u64 noise_level; | |
69 | u64 power; | |
70 | }; | |
71 | ||
72 | struct acpi_fan_fif { | |
73 | u64 revision; | |
74 | u64 fine_grain_ctrl; | |
75 | u64 step_size; | |
76 | u64 low_speed_notification; | |
77 | }; | |
78 | ||
79 | struct acpi_fan { | |
80 | bool acpi4; | |
81 | struct acpi_fan_fif fif; | |
82 | struct acpi_fan_fps *fps; | |
83 | int fps_count; | |
84 | struct thermal_cooling_device *cdev; | |
85 | }; | |
86 | ||
19593a1f AL |
87 | static struct platform_driver acpi_fan_driver = { |
88 | .probe = acpi_fan_probe, | |
89 | .remove = acpi_fan_remove, | |
90 | .driver = { | |
91 | .name = "acpi-fan", | |
92 | .acpi_match_table = fan_device_ids, | |
93 | .pm = FAN_PM_OPS_PTR, | |
94 | }, | |
1da177e4 LT |
95 | }; |
96 | ||
05a83d97 | 97 | /* thermal cooling device callbacks */ |
6503e5df MG |
98 | static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long |
99 | *state) | |
05a83d97 | 100 | { |
9519a635 AL |
101 | struct acpi_device *device = cdev->devdata; |
102 | struct acpi_fan *fan = acpi_driver_data(device); | |
103 | ||
104 | if (fan->acpi4) | |
105 | *state = fan->fps_count - 1; | |
106 | else | |
107 | *state = 1; | |
6503e5df | 108 | return 0; |
05a83d97 ZR |
109 | } |
110 | ||
9519a635 AL |
111 | static int fan_get_state_acpi4(struct acpi_device *device, unsigned long *state) |
112 | { | |
113 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
114 | struct acpi_fan *fan = acpi_driver_data(device); | |
115 | union acpi_object *obj; | |
116 | acpi_status status; | |
117 | int control, i; | |
118 | ||
119 | status = acpi_evaluate_object(device->handle, "_FST", NULL, &buffer); | |
120 | if (ACPI_FAILURE(status)) { | |
121 | dev_err(&device->dev, "Get fan state failed\n"); | |
122 | return status; | |
123 | } | |
124 | ||
125 | obj = buffer.pointer; | |
126 | if (!obj || obj->type != ACPI_TYPE_PACKAGE || | |
127 | obj->package.count != 3 || | |
128 | obj->package.elements[1].type != ACPI_TYPE_INTEGER) { | |
129 | dev_err(&device->dev, "Invalid _FST data\n"); | |
130 | status = -EINVAL; | |
131 | goto err; | |
132 | } | |
133 | ||
134 | control = obj->package.elements[1].integer.value; | |
135 | for (i = 0; i < fan->fps_count; i++) { | |
136 | if (control == fan->fps[i].control) | |
137 | break; | |
138 | } | |
139 | if (i == fan->fps_count) { | |
140 | dev_dbg(&device->dev, "Invalid control value returned\n"); | |
141 | status = -EINVAL; | |
142 | goto err; | |
143 | } | |
144 | ||
145 | *state = i; | |
146 | ||
147 | err: | |
148 | kfree(obj); | |
149 | return status; | |
150 | } | |
151 | ||
152 | static int fan_get_state(struct acpi_device *device, unsigned long *state) | |
05a83d97 | 153 | { |
05a83d97 | 154 | int result; |
85eb9827 | 155 | int acpi_state = ACPI_STATE_D0; |
05a83d97 | 156 | |
2bb3a2bf | 157 | result = acpi_device_update_power(device, &acpi_state); |
05a83d97 ZR |
158 | if (result) |
159 | return result; | |
160 | ||
8ad928d5 | 161 | *state = (acpi_state == ACPI_STATE_D3_COLD ? 0 : |
6503e5df MG |
162 | (acpi_state == ACPI_STATE_D0 ? 1 : -1)); |
163 | return 0; | |
05a83d97 ZR |
164 | } |
165 | ||
9519a635 AL |
166 | static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long |
167 | *state) | |
05a83d97 ZR |
168 | { |
169 | struct acpi_device *device = cdev->devdata; | |
9519a635 | 170 | struct acpi_fan *fan = acpi_driver_data(device); |
05a83d97 | 171 | |
9519a635 AL |
172 | if (fan->acpi4) |
173 | return fan_get_state_acpi4(device, state); | |
174 | else | |
175 | return fan_get_state(device, state); | |
176 | } | |
05a83d97 | 177 | |
9519a635 AL |
178 | static int fan_set_state(struct acpi_device *device, unsigned long state) |
179 | { | |
180 | if (state != 0 && state != 1) | |
05a83d97 ZR |
181 | return -EINVAL; |
182 | ||
9519a635 AL |
183 | return acpi_device_set_power(device, |
184 | state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD); | |
185 | } | |
05a83d97 | 186 | |
9519a635 AL |
187 | static int fan_set_state_acpi4(struct acpi_device *device, unsigned long state) |
188 | { | |
189 | struct acpi_fan *fan = acpi_driver_data(device); | |
190 | acpi_status status; | |
191 | ||
192 | if (state >= fan->fps_count) | |
193 | return -EINVAL; | |
194 | ||
195 | status = acpi_execute_simple_method(device->handle, "_FSL", | |
196 | fan->fps[state].control); | |
197 | if (ACPI_FAILURE(status)) { | |
198 | dev_dbg(&device->dev, "Failed to set state by _FSL\n"); | |
199 | return status; | |
200 | } | |
201 | ||
202 | return 0; | |
05a83d97 ZR |
203 | } |
204 | ||
9519a635 AL |
205 | static int |
206 | fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) | |
207 | { | |
208 | struct acpi_device *device = cdev->devdata; | |
209 | struct acpi_fan *fan = acpi_driver_data(device); | |
210 | ||
211 | if (fan->acpi4) | |
212 | return fan_set_state_acpi4(device, state); | |
213 | else | |
214 | return fan_set_state(device, state); | |
215 | } | |
216 | ||
9c8b04be | 217 | static const struct thermal_cooling_device_ops fan_cooling_ops = { |
05a83d97 ZR |
218 | .get_max_state = fan_get_max_state, |
219 | .get_cur_state = fan_get_cur_state, | |
220 | .set_cur_state = fan_set_cur_state, | |
221 | }; | |
222 | ||
1da177e4 | 223 | /* -------------------------------------------------------------------------- |
88989fd2 SM |
224 | * Driver Interface |
225 | * -------------------------------------------------------------------------- | |
226 | */ | |
1da177e4 | 227 | |
9519a635 | 228 | static bool acpi_fan_is_acpi4(struct acpi_device *device) |
1da177e4 | 229 | { |
9519a635 AL |
230 | return acpi_has_method(device->handle, "_FIF") && |
231 | acpi_has_method(device->handle, "_FPS") && | |
232 | acpi_has_method(device->handle, "_FSL") && | |
233 | acpi_has_method(device->handle, "_FST"); | |
234 | } | |
1da177e4 | 235 | |
9519a635 AL |
236 | static int acpi_fan_get_fif(struct acpi_device *device) |
237 | { | |
238 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
239 | struct acpi_fan *fan = acpi_driver_data(device); | |
240 | struct acpi_buffer format = { sizeof("NNNN"), "NNNN" }; | |
241 | struct acpi_buffer fif = { sizeof(fan->fif), &fan->fif }; | |
242 | union acpi_object *obj; | |
243 | acpi_status status; | |
244 | ||
245 | status = acpi_evaluate_object(device->handle, "_FIF", NULL, &buffer); | |
246 | if (ACPI_FAILURE(status)) | |
247 | return status; | |
248 | ||
249 | obj = buffer.pointer; | |
250 | if (!obj || obj->type != ACPI_TYPE_PACKAGE) { | |
251 | dev_err(&device->dev, "Invalid _FIF data\n"); | |
252 | status = -EINVAL; | |
253 | goto err; | |
254 | } | |
1da177e4 | 255 | |
9519a635 AL |
256 | status = acpi_extract_package(obj, &format, &fif); |
257 | if (ACPI_FAILURE(status)) { | |
258 | dev_err(&device->dev, "Invalid _FIF element\n"); | |
259 | status = -EINVAL; | |
260 | } | |
1da177e4 | 261 | |
9519a635 AL |
262 | err: |
263 | kfree(obj); | |
264 | return status; | |
265 | } | |
266 | ||
267 | static int acpi_fan_speed_cmp(const void *a, const void *b) | |
268 | { | |
269 | const struct acpi_fan_fps *fps1 = a; | |
270 | const struct acpi_fan_fps *fps2 = b; | |
271 | return fps1->speed - fps2->speed; | |
272 | } | |
273 | ||
274 | static int acpi_fan_get_fps(struct acpi_device *device) | |
275 | { | |
276 | struct acpi_fan *fan = acpi_driver_data(device); | |
277 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
278 | union acpi_object *obj; | |
279 | acpi_status status; | |
280 | int i; | |
281 | ||
282 | status = acpi_evaluate_object(device->handle, "_FPS", NULL, &buffer); | |
283 | if (ACPI_FAILURE(status)) | |
284 | return status; | |
285 | ||
286 | obj = buffer.pointer; | |
287 | if (!obj || obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) { | |
288 | dev_err(&device->dev, "Invalid _FPS data\n"); | |
289 | status = -EINVAL; | |
290 | goto err; | |
291 | } | |
292 | ||
293 | fan->fps_count = obj->package.count - 1; /* minus revision field */ | |
294 | fan->fps = devm_kzalloc(&device->dev, | |
295 | fan->fps_count * sizeof(struct acpi_fan_fps), | |
296 | GFP_KERNEL); | |
297 | if (!fan->fps) { | |
298 | dev_err(&device->dev, "Not enough memory\n"); | |
299 | status = -ENOMEM; | |
300 | goto err; | |
301 | } | |
302 | for (i = 0; i < fan->fps_count; i++) { | |
303 | struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" }; | |
304 | struct acpi_buffer fps = { sizeof(fan->fps[i]), &fan->fps[i] }; | |
305 | status = acpi_extract_package(&obj->package.elements[i + 1], | |
306 | &format, &fps); | |
307 | if (ACPI_FAILURE(status)) { | |
308 | dev_err(&device->dev, "Invalid _FPS element\n"); | |
309 | break; | |
310 | } | |
311 | } | |
312 | ||
313 | /* sort the state array according to fan speed in increase order */ | |
314 | sort(fan->fps, fan->fps_count, sizeof(*fan->fps), | |
315 | acpi_fan_speed_cmp, NULL); | |
316 | ||
317 | err: | |
318 | kfree(obj); | |
319 | return status; | |
320 | } | |
321 | ||
19593a1f | 322 | static int acpi_fan_probe(struct platform_device *pdev) |
1da177e4 | 323 | { |
4be44fcd | 324 | int result = 0; |
05a83d97 | 325 | struct thermal_cooling_device *cdev; |
9519a635 | 326 | struct acpi_fan *fan; |
19593a1f | 327 | struct acpi_device *device = ACPI_COMPANION(&pdev->dev); |
bbb16fef | 328 | char *name; |
1da177e4 | 329 | |
9519a635 AL |
330 | fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL); |
331 | if (!fan) { | |
332 | dev_err(&device->dev, "No memory for fan\n"); | |
333 | return -ENOMEM; | |
334 | } | |
335 | device->driver_data = fan; | |
336 | platform_set_drvdata(pdev, fan); | |
337 | ||
338 | if (acpi_fan_is_acpi4(device)) { | |
339 | if (acpi_fan_get_fif(device) || acpi_fan_get_fps(device)) | |
340 | goto end; | |
341 | fan->acpi4 = true; | |
342 | } else { | |
343 | result = acpi_device_update_power(device, NULL); | |
344 | if (result) { | |
345 | dev_err(&device->dev, "Setting initial power state\n"); | |
346 | goto end; | |
347 | } | |
1da177e4 LT |
348 | } |
349 | ||
bbb16fef SP |
350 | if (!strncmp(pdev->name, "PNP0C0B", strlen("PNP0C0B"))) |
351 | name = "Fan"; | |
352 | else | |
353 | name = acpi_device_bid(device); | |
354 | ||
355 | cdev = thermal_cooling_device_register(name, device, | |
05a83d97 | 356 | &fan_cooling_ops); |
19b36780 TS |
357 | if (IS_ERR(cdev)) { |
358 | result = PTR_ERR(cdev); | |
359 | goto end; | |
360 | } | |
9030062f | 361 | |
19593a1f | 362 | dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id); |
9030062f | 363 | |
9519a635 | 364 | fan->cdev = cdev; |
19593a1f | 365 | result = sysfs_create_link(&pdev->dev.kobj, |
9030062f JL |
366 | &cdev->device.kobj, |
367 | "thermal_cooling"); | |
368 | if (result) | |
8264fce6 | 369 | dev_err(&pdev->dev, "Failed to create sysfs link 'thermal_cooling'\n"); |
9030062f JL |
370 | |
371 | result = sysfs_create_link(&cdev->device.kobj, | |
19593a1f | 372 | &pdev->dev.kobj, |
9030062f JL |
373 | "device"); |
374 | if (result) | |
8264fce6 | 375 | dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n"); |
1da177e4 | 376 | |
568b6ad8 | 377 | end: |
d550d98d | 378 | return result; |
1da177e4 LT |
379 | } |
380 | ||
19593a1f | 381 | static int acpi_fan_remove(struct platform_device *pdev) |
1da177e4 | 382 | { |
9519a635 | 383 | struct acpi_fan *fan = platform_get_drvdata(pdev); |
1da177e4 | 384 | |
19593a1f | 385 | sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling"); |
9519a635 AL |
386 | sysfs_remove_link(&fan->cdev->device.kobj, "device"); |
387 | thermal_cooling_device_unregister(fan->cdev); | |
1da177e4 | 388 | |
d550d98d | 389 | return 0; |
1da177e4 LT |
390 | } |
391 | ||
90692404 | 392 | #ifdef CONFIG_PM_SLEEP |
62fcbdd9 | 393 | static int acpi_fan_suspend(struct device *dev) |
ec68373c | 394 | { |
9519a635 AL |
395 | struct acpi_fan *fan = dev_get_drvdata(dev); |
396 | if (fan->acpi4) | |
397 | return 0; | |
ec68373c | 398 | |
19593a1f | 399 | acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0); |
ec68373c LB |
400 | |
401 | return AE_OK; | |
402 | } | |
403 | ||
62fcbdd9 | 404 | static int acpi_fan_resume(struct device *dev) |
ec68373c | 405 | { |
488a76c5 | 406 | int result; |
9519a635 | 407 | struct acpi_fan *fan = dev_get_drvdata(dev); |
ec68373c | 408 | |
9519a635 AL |
409 | if (fan->acpi4) |
410 | return 0; | |
ec68373c | 411 | |
19593a1f | 412 | result = acpi_device_update_power(ACPI_COMPANION(dev), NULL); |
488a76c5 | 413 | if (result) |
88989fd2 | 414 | dev_err(dev, "Error updating fan power state\n"); |
ec68373c LB |
415 | |
416 | return result; | |
417 | } | |
90692404 | 418 | #endif |
ec68373c | 419 | |
19593a1f | 420 | module_platform_driver(acpi_fan_driver); |