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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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 20  */
 21 
 22 #include <linux/kernel.h>
 23 #include <linux/module.h>
 24 #include <linux/init.h>
 25 #include <linux/types.h>
 26 #include <linux/uaccess.h>
 27 #include <linux/thermal.h>
 28 #include <linux/acpi.h>
 29 #include <linux/platform_device.h>
 30 #include <linux/sort.h>
 31 
 32 MODULE_AUTHOR("Paul Diefenbaugh");
 33 MODULE_DESCRIPTION("ACPI Fan Driver");
 34 MODULE_LICENSE("GPL");
 35 
 36 static int acpi_fan_probe(struct platform_device *pdev);
 37 static int acpi_fan_remove(struct platform_device *pdev);
 38 
 39 static const struct acpi_device_id fan_device_ids[] = {
 40         {"PNP0C0B", 0},
 41         {"INT3404", 0},
 42         {"", 0},
 43 };
 44 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
 45 
 46 #ifdef CONFIG_PM_SLEEP
 47 static int acpi_fan_suspend(struct device *dev);
 48 static int acpi_fan_resume(struct device *dev);
 49 static const 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)
 56 #else
 57 #define FAN_PM_OPS_PTR NULL
 58 #endif
 59 
 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 
 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         },
 91 };
 92 
 93 /* thermal cooling device callbacks */
 94 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
 95                              *state)
 96 {
 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;
104         return 0;
105 }
106 
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)
149 {
150         int result;
151         int acpi_state = ACPI_STATE_D0;
152 
153         result = acpi_device_update_power(device, &acpi_state);
154         if (result)
155                 return result;
156 
157         *state = acpi_state == ACPI_STATE_D3_COLD
158                         || acpi_state == ACPI_STATE_D3_HOT ?
159                 0 : (acpi_state == ACPI_STATE_D0 ? 1 : -1);
160         return 0;
161 }
162 
163 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
164                              *state)
165 {
166         struct acpi_device *device = cdev->devdata;
167         struct acpi_fan *fan = acpi_driver_data(device);
168 
169         if (fan->acpi4)
170                 return fan_get_state_acpi4(device, state);
171         else
172                 return fan_get_state(device, state);
173 }
174 
175 static int fan_set_state(struct acpi_device *device, unsigned long state)
176 {
177         if (state != 0 && state != 1)
178                 return -EINVAL;
179 
180         return acpi_device_set_power(device,
181                                      state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
182 }
183 
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;
200 }
201 
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 
214 static const struct thermal_cooling_device_ops fan_cooling_ops = {
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 
220 /* --------------------------------------------------------------------------
221  *                               Driver Interface
222  * --------------------------------------------------------------------------
223 */
224 
225 static bool acpi_fan_is_acpi4(struct acpi_device *device)
226 {
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 }
232 
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         }
252 
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         }
258 
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 
319 static int acpi_fan_probe(struct platform_device *pdev)
320 {
321         int result = 0;
322         struct thermal_cooling_device *cdev;
323         struct acpi_fan *fan;
324         struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
325         char *name;
326 
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, "Failed to set initial power state\n");
343                         goto end;
344                 }
345         }
346 
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,
353                                                 &fan_cooling_ops);
354         if (IS_ERR(cdev)) {
355                 result = PTR_ERR(cdev);
356                 goto end;
357         }
358 
359         dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id);
360 
361         fan->cdev = cdev;
362         result = sysfs_create_link(&pdev->dev.kobj,
363                                    &cdev->device.kobj,
364                                    "thermal_cooling");
365         if (result)
366                 dev_err(&pdev->dev, "Failed to create sysfs link 'thermal_cooling'\n");
367 
368         result = sysfs_create_link(&cdev->device.kobj,
369                                    &pdev->dev.kobj,
370                                    "device");
371         if (result)
372                 dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n");
373 
374 end:
375         return result;
376 }
377 
378 static int acpi_fan_remove(struct platform_device *pdev)
379 {
380         struct acpi_fan *fan = platform_get_drvdata(pdev);
381 
382         sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling");
383         sysfs_remove_link(&fan->cdev->device.kobj, "device");
384         thermal_cooling_device_unregister(fan->cdev);
385 
386         return 0;
387 }
388 
389 #ifdef CONFIG_PM_SLEEP
390 static int acpi_fan_suspend(struct device *dev)
391 {
392         struct acpi_fan *fan = dev_get_drvdata(dev);
393         if (fan->acpi4)
394                 return 0;
395 
396         acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0);
397 
398         return AE_OK;
399 }
400 
401 static int acpi_fan_resume(struct device *dev)
402 {
403         int result;
404         struct acpi_fan *fan = dev_get_drvdata(dev);
405 
406         if (fan->acpi4)
407                 return 0;
408 
409         result = acpi_device_update_power(ACPI_COMPANION(dev), NULL);
410         if (result)
411                 dev_err(dev, "Error updating fan power state\n");
412 
413         return result;
414 }
415 #endif
416 
417 module_platform_driver(acpi_fan_driver);
418 

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