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Linux/drivers/acpi/fan.c

  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>
 30 #include <linux/uaccess.h>
 31 #include <linux/thermal.h>
 32 #include <linux/acpi.h>
 33 #include <linux/platform_device.h>
 34 #include <linux/sort.h>
 35 
 36 MODULE_AUTHOR("Paul Diefenbaugh");
 37 MODULE_DESCRIPTION("ACPI Fan Driver");
 38 MODULE_LICENSE("GPL");
 39 
 40 static int acpi_fan_probe(struct platform_device *pdev);
 41 static int acpi_fan_remove(struct platform_device *pdev);
 42 
 43 static const struct acpi_device_id fan_device_ids[] = {
 44         {"PNP0C0B", 0},
 45         {"INT3404", 0},
 46         {"", 0},
 47 };
 48 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
 49 
 50 #ifdef CONFIG_PM_SLEEP
 51 static int acpi_fan_suspend(struct device *dev);
 52 static int acpi_fan_resume(struct device *dev);
 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)
 60 #else
 61 #define FAN_PM_OPS_PTR NULL
 62 #endif
 63 
 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 
 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         },
 95 };
 96 
 97 /* thermal cooling device callbacks */
 98 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
 99                              *state)
100 {
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;
108         return 0;
109 }
110 
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)
153 {
154         int result;
155         int acpi_state = ACPI_STATE_D0;
156 
157         result = acpi_device_update_power(device, &acpi_state);
158         if (result)
159                 return result;
160 
161         *state = (acpi_state == ACPI_STATE_D3_COLD ? 0 :
162                  (acpi_state == ACPI_STATE_D0 ? 1 : -1));
163         return 0;
164 }
165 
166 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
167                              *state)
168 {
169         struct acpi_device *device = cdev->devdata;
170         struct acpi_fan *fan = acpi_driver_data(device);
171 
172         if (fan->acpi4)
173                 return fan_get_state_acpi4(device, state);
174         else
175                 return fan_get_state(device, state);
176 }
177 
178 static int fan_set_state(struct acpi_device *device, unsigned long state)
179 {
180         if (state != 0 && state != 1)
181                 return -EINVAL;
182 
183         return acpi_device_set_power(device,
184                                      state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
185 }
186 
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;
203 }
204 
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 
217 static const struct thermal_cooling_device_ops fan_cooling_ops = {
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 
223 /* --------------------------------------------------------------------------
224  *                               Driver Interface
225  * --------------------------------------------------------------------------
226 */
227 
228 static bool acpi_fan_is_acpi4(struct acpi_device *device)
229 {
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 }
235 
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         }
255 
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         }
261 
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 
322 static int acpi_fan_probe(struct platform_device *pdev)
323 {
324         int result = 0;
325         struct thermal_cooling_device *cdev;
326         struct acpi_fan *fan;
327         struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
328 
329         fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
330         if (!fan) {
331                 dev_err(&device->dev, "No memory for fan\n");
332                 return -ENOMEM;
333         }
334         device->driver_data = fan;
335         platform_set_drvdata(pdev, fan);
336 
337         if (acpi_fan_is_acpi4(device)) {
338                 if (acpi_fan_get_fif(device) || acpi_fan_get_fps(device))
339                         goto end;
340                 fan->acpi4 = true;
341         } else {
342                 result = acpi_device_update_power(device, NULL);
343                 if (result) {
344                         dev_err(&device->dev, "Setting initial power state\n");
345                         goto end;
346                 }
347         }
348 
349         cdev = thermal_cooling_device_register("Fan", device,
350                                                 &fan_cooling_ops);
351         if (IS_ERR(cdev)) {
352                 result = PTR_ERR(cdev);
353                 goto end;
354         }
355 
356         dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id);
357 
358         fan->cdev = cdev;
359         result = sysfs_create_link(&pdev->dev.kobj,
360                                    &cdev->device.kobj,
361                                    "thermal_cooling");
362         if (result)
363                 dev_err(&pdev->dev, "Failed to create sysfs link 'thermal_cooling'\n");
364 
365         result = sysfs_create_link(&cdev->device.kobj,
366                                    &pdev->dev.kobj,
367                                    "device");
368         if (result)
369                 dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n");
370 
371 end:
372         return result;
373 }
374 
375 static int acpi_fan_remove(struct platform_device *pdev)
376 {
377         struct acpi_fan *fan = platform_get_drvdata(pdev);
378 
379         sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling");
380         sysfs_remove_link(&fan->cdev->device.kobj, "device");
381         thermal_cooling_device_unregister(fan->cdev);
382 
383         return 0;
384 }
385 
386 #ifdef CONFIG_PM_SLEEP
387 static int acpi_fan_suspend(struct device *dev)
388 {
389         struct acpi_fan *fan = dev_get_drvdata(dev);
390         if (fan->acpi4)
391                 return 0;
392 
393         acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0);
394 
395         return AE_OK;
396 }
397 
398 static int acpi_fan_resume(struct device *dev)
399 {
400         int result;
401         struct acpi_fan *fan = dev_get_drvdata(dev);
402 
403         if (fan->acpi4)
404                 return 0;
405 
406         result = acpi_device_update_power(ACPI_COMPANION(dev), NULL);
407         if (result)
408                 dev_err(dev, "Error updating fan power state\n");
409 
410         return result;
411 }
412 #endif
413 
414 module_platform_driver(acpi_fan_driver);
415 

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