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Linux/drivers/staging/quickstart/quickstart.c

  1 /*
  2  *  quickstart.c - ACPI Direct App Launch driver
  3  *
  4  *
  5  *  Copyright (C) 2007-2010 Angelo Arrifano <miknix@gmail.com>
  6  *
  7  *  Information gathered from disassembled dsdt and from here:
  8  *  <http://www.microsoft.com/whdc/system/platform/firmware/DirAppLaunch.mspx>
  9  *
 10  *  This program is free software; you can redistribute it and/or modify
 11  *  it under the terms of the GNU General Public License as published by
 12  *  the Free Software Foundation; either version 2 of the License, or
 13  *  (at your option) any later version.
 14  *
 15  *  This program is distributed in the hope that it will be useful,
 16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  *  GNU General Public License for more details.
 19  *
 20  *  You should have received a copy of the GNU General Public License
 21  *  along with this program; if not, write to the Free Software
 22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 23  *
 24  */
 25 
 26 #define QUICKSTART_VERSION "1.04"
 27 
 28 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 29 
 30 #include <linux/kernel.h>
 31 #include <linux/module.h>
 32 #include <linux/init.h>
 33 #include <linux/types.h>
 34 #include <linux/acpi.h>
 35 #include <linux/platform_device.h>
 36 #include <linux/input.h>
 37 
 38 MODULE_AUTHOR("Angelo Arrifano");
 39 MODULE_DESCRIPTION("ACPI Direct App Launch driver");
 40 MODULE_LICENSE("GPL");
 41 
 42 #define QUICKSTART_ACPI_DEVICE_NAME     "quickstart"
 43 #define QUICKSTART_ACPI_CLASS           "quickstart"
 44 #define QUICKSTART_ACPI_HID             "PNP0C32"
 45 
 46 #define QUICKSTART_PF_DRIVER_NAME       "quickstart"
 47 #define QUICKSTART_PF_DEVICE_NAME       "quickstart"
 48 
 49 /*
 50  * There will be two events:
 51  * 0x02 - A hot button was pressed while device was off/sleeping.
 52  * 0x80 - A hot button was pressed while device was up.
 53  */
 54 #define QUICKSTART_EVENT_WAKE           0x02
 55 #define QUICKSTART_EVENT_RUNTIME        0x80
 56 
 57 struct quickstart_button {
 58         char *name;
 59         unsigned int id;
 60         struct list_head list;
 61 };
 62 
 63 struct quickstart_acpi {
 64         struct acpi_device *device;
 65         struct quickstart_button *button;
 66 };
 67 
 68 static LIST_HEAD(buttons);
 69 static struct quickstart_button *pressed;
 70 
 71 static struct input_dev *quickstart_input;
 72 
 73 /* Platform driver functions */
 74 static ssize_t buttons_show(struct device *dev, struct device_attribute *attr,
 75                             char *buf)
 76 {
 77         int count = 0;
 78         struct quickstart_button *b;
 79 
 80         if (list_empty(&buttons))
 81                 return snprintf(buf, PAGE_SIZE, "none");
 82 
 83         list_for_each_entry(b, &buttons, list) {
 84                 count += snprintf(buf + count, PAGE_SIZE - count, "%u\t%s\n",
 85                                                         b->id, b->name);
 86 
 87                 if (count >= PAGE_SIZE) {
 88                         count = PAGE_SIZE;
 89                         break;
 90                 }
 91         }
 92 
 93         return count;
 94 }
 95 
 96 static ssize_t pressed_button_show(struct device *dev,
 97                                    struct device_attribute *attr, char *buf)
 98 {
 99         return scnprintf(buf, PAGE_SIZE, "%s\n",
100                                         (pressed ? pressed->name : "none"));
101 }
102 
103 
104 static ssize_t pressed_button_store(struct device *dev,
105                                     struct device_attribute *attr,
106                                     const char *buf, size_t count)
107 {
108         if (count < 2)
109                 return -EINVAL;
110 
111         if (strncasecmp(buf, "none", 4) != 0)
112                 return -EINVAL;
113 
114         pressed = NULL;
115         return count;
116 }
117 
118 /* Helper functions */
119 static struct quickstart_button *quickstart_buttons_add(void)
120 {
121         struct quickstart_button *b;
122 
123         b = kzalloc(sizeof(*b), GFP_KERNEL);
124         if (!b)
125                 return NULL;
126 
127         list_add_tail(&b->list, &buttons);
128 
129         return b;
130 }
131 
132 static void quickstart_button_del(struct quickstart_button *data)
133 {
134         if (!data)
135                 return;
136 
137         list_del(&data->list);
138         kfree(data->name);
139         kfree(data);
140 }
141 
142 static void quickstart_buttons_free(void)
143 {
144         struct quickstart_button *b, *n;
145 
146         list_for_each_entry_safe(b, n, &buttons, list)
147                 quickstart_button_del(b);
148 }
149 
150 /* ACPI Driver functions */
151 static void quickstart_acpi_notify(acpi_handle handle, u32 event, void *data)
152 {
153         struct quickstart_acpi *quickstart = data;
154 
155         if (!quickstart)
156                 return;
157 
158         switch (event) {
159         case QUICKSTART_EVENT_WAKE:
160                 pressed = quickstart->button;
161                 break;
162         case QUICKSTART_EVENT_RUNTIME:
163                 input_report_key(quickstart_input, quickstart->button->id, 1);
164                 input_sync(quickstart_input);
165                 input_report_key(quickstart_input, quickstart->button->id, 0);
166                 input_sync(quickstart_input);
167                 break;
168         default:
169                 pr_err("Unexpected ACPI event notify (%u)\n", event);
170                 break;
171         }
172 }
173 
174 static int quickstart_acpi_ghid(struct quickstart_acpi *quickstart)
175 {
176         acpi_status status;
177         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
178         int ret = 0;
179 
180         /*
181          * This returns a buffer telling the button usage ID,
182          * and triggers pending notify events (The ones before booting).
183          */
184         status = acpi_evaluate_object(quickstart->device->handle, "GHID", NULL,
185                                                                 &buffer);
186         if (ACPI_FAILURE(status)) {
187                 pr_err("%s GHID method failed\n", quickstart->button->name);
188                 return -EINVAL;
189         }
190 
191         /*
192          * <<The GHID method can return a BYTE, WORD, or DWORD.
193          * The value must be encoded in little-endian byte
194          * order (least significant byte first).>>
195          */
196         switch (buffer.length) {
197         case 1:
198                 quickstart->button->id = *(uint8_t *)buffer.pointer;
199                 break;
200         case 2:
201                 quickstart->button->id = *(uint16_t *)buffer.pointer;
202                 break;
203         case 4:
204                 quickstart->button->id = *(uint32_t *)buffer.pointer;
205                 break;
206         case 8:
207                 quickstart->button->id = *(uint64_t *)buffer.pointer;
208                 break;
209         default:
210                 pr_err("%s GHID method returned buffer of unexpected length %lu\n",
211                                 quickstart->button->name,
212                                 (unsigned long)buffer.length);
213                 ret = -EINVAL;
214                 break;
215         }
216 
217         kfree(buffer.pointer);
218 
219         return ret;
220 }
221 
222 static int quickstart_acpi_config(struct quickstart_acpi *quickstart)
223 {
224         char *bid = acpi_device_bid(quickstart->device);
225         char *name;
226 
227         name = kmalloc(strlen(bid) + 1, GFP_KERNEL);
228         if (!name)
229                 return -ENOMEM;
230 
231         /* Add new button to list */
232         quickstart->button = quickstart_buttons_add();
233         if (!quickstart->button) {
234                 kfree(name);
235                 return -ENOMEM;
236         }
237 
238         quickstart->button->name = name;
239         strcpy(quickstart->button->name, bid);
240 
241         return 0;
242 }
243 
244 static int quickstart_acpi_add(struct acpi_device *device)
245 {
246         int ret;
247         acpi_status status;
248         struct quickstart_acpi *quickstart;
249 
250         if (!device)
251                 return -EINVAL;
252 
253         quickstart = kzalloc(sizeof(*quickstart), GFP_KERNEL);
254         if (!quickstart)
255                 return -ENOMEM;
256 
257         quickstart->device = device;
258 
259         strcpy(acpi_device_name(device), QUICKSTART_ACPI_DEVICE_NAME);
260         strcpy(acpi_device_class(device), QUICKSTART_ACPI_CLASS);
261         device->driver_data = quickstart;
262 
263         /* Add button to list and initialize some stuff */
264         ret = quickstart_acpi_config(quickstart);
265         if (ret < 0)
266                 goto fail_config;
267 
268         status = acpi_install_notify_handler(device->handle, ACPI_ALL_NOTIFY,
269                                                 quickstart_acpi_notify,
270                                                 quickstart);
271         if (ACPI_FAILURE(status)) {
272                 pr_err("Notify handler install error\n");
273                 ret = -ENODEV;
274                 goto fail_installnotify;
275         }
276 
277         ret = quickstart_acpi_ghid(quickstart);
278         if (ret < 0)
279                 goto fail_ghid;
280 
281         return 0;
282 
283 fail_ghid:
284         acpi_remove_notify_handler(device->handle, ACPI_ALL_NOTIFY,
285                                                 quickstart_acpi_notify);
286 
287 fail_installnotify:
288         quickstart_button_del(quickstart->button);
289 
290 fail_config:
291 
292         kfree(quickstart);
293 
294         return ret;
295 }
296 
297 static int quickstart_acpi_remove(struct acpi_device *device)
298 {
299         acpi_status status;
300         struct quickstart_acpi *quickstart;
301 
302         if (!device)
303                 return -EINVAL;
304 
305         quickstart = acpi_driver_data(device);
306         if (!quickstart)
307                 return -EINVAL;
308 
309         status = acpi_remove_notify_handler(device->handle, ACPI_ALL_NOTIFY,
310                                                 quickstart_acpi_notify);
311         if (ACPI_FAILURE(status))
312                 pr_err("Error removing notify handler\n");
313 
314         kfree(quickstart);
315 
316         return 0;
317 }
318 
319 /* Platform driver structs */
320 static DEVICE_ATTR_RW(pressed_button);
321 static DEVICE_ATTR_RO(buttons);
322 static struct platform_device *pf_device;
323 static struct platform_driver pf_driver = {
324         .driver = {
325                 .name = QUICKSTART_PF_DRIVER_NAME,
326                 .owner = THIS_MODULE,
327         }
328 };
329 
330 static const struct acpi_device_id quickstart_device_ids[] = {
331         {QUICKSTART_ACPI_HID, 0},
332         {"", 0},
333 };
334 
335 static struct acpi_driver quickstart_acpi_driver = {
336         .name = "quickstart",
337         .class = QUICKSTART_ACPI_CLASS,
338         .ids = quickstart_device_ids,
339         .ops = {
340                         .add = quickstart_acpi_add,
341                         .remove = quickstart_acpi_remove,
342                 },
343 };
344 
345 /* Module functions */
346 static void quickstart_exit(void)
347 {
348         input_unregister_device(quickstart_input);
349 
350         device_remove_file(&pf_device->dev, &dev_attr_pressed_button);
351         device_remove_file(&pf_device->dev, &dev_attr_buttons);
352 
353         platform_device_unregister(pf_device);
354 
355         platform_driver_unregister(&pf_driver);
356 
357         acpi_bus_unregister_driver(&quickstart_acpi_driver);
358 
359         quickstart_buttons_free();
360 }
361 
362 static int __init quickstart_init_input(void)
363 {
364         struct quickstart_button *b;
365         int ret;
366 
367         quickstart_input = input_allocate_device();
368 
369         if (!quickstart_input)
370                 return -ENOMEM;
371 
372         quickstart_input->name = "Quickstart ACPI Buttons";
373         quickstart_input->id.bustype = BUS_HOST;
374 
375         list_for_each_entry(b, &buttons, list) {
376                 set_bit(EV_KEY, quickstart_input->evbit);
377                 set_bit(b->id, quickstart_input->keybit);
378         }
379 
380         ret = input_register_device(quickstart_input);
381         if (ret) {
382                 input_free_device(quickstart_input);
383                 return ret;
384         }
385 
386         return 0;
387 }
388 
389 static int __init quickstart_init(void)
390 {
391         int ret;
392 
393         /* ACPI driver register */
394         ret = acpi_bus_register_driver(&quickstart_acpi_driver);
395         if (ret)
396                 return ret;
397 
398         /* If existing bus with no devices */
399         if (list_empty(&buttons)) {
400                 ret = -ENODEV;
401                 goto fail_pfdrv_reg;
402         }
403 
404         /* Platform driver register */
405         ret = platform_driver_register(&pf_driver);
406         if (ret)
407                 goto fail_pfdrv_reg;
408 
409         /* Platform device register */
410         pf_device = platform_device_alloc(QUICKSTART_PF_DEVICE_NAME, -1);
411         if (!pf_device) {
412                 ret = -ENOMEM;
413                 goto fail_pfdev_alloc;
414         }
415         ret = platform_device_add(pf_device);
416         if (ret)
417                 goto fail_pfdev_add;
418 
419         /* Create device sysfs file */
420         ret = device_create_file(&pf_device->dev, &dev_attr_pressed_button);
421         if (ret)
422                 goto fail_dev_file;
423 
424         ret = device_create_file(&pf_device->dev, &dev_attr_buttons);
425         if (ret)
426                 goto fail_dev_file2;
427 
428         /* Input device */
429         ret = quickstart_init_input();
430         if (ret)
431                 goto fail_input;
432 
433         pr_info("ACPI Direct App Launch ver %s\n", QUICKSTART_VERSION);
434 
435         return 0;
436 fail_input:
437         device_remove_file(&pf_device->dev, &dev_attr_buttons);
438 
439 fail_dev_file2:
440         device_remove_file(&pf_device->dev, &dev_attr_pressed_button);
441 
442 fail_dev_file:
443         platform_device_del(pf_device);
444 
445 fail_pfdev_add:
446         platform_device_put(pf_device);
447 
448 fail_pfdev_alloc:
449         platform_driver_unregister(&pf_driver);
450 
451 fail_pfdrv_reg:
452         acpi_bus_unregister_driver(&quickstart_acpi_driver);
453 
454         return ret;
455 }
456 
457 module_init(quickstart_init);
458 module_exit(quickstart_exit);
459 

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