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22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/types.h>
26#include <linux/proc_fs.h>
27#include <linux/seq_file.h>
28#include <linux/input.h>
29#include <linux/slab.h>
30#include <linux/acpi.h>
31#include <acpi/button.h>
32
33#define PREFIX "ACPI: "
34
35#define ACPI_BUTTON_CLASS "button"
36#define ACPI_BUTTON_FILE_INFO "info"
37#define ACPI_BUTTON_FILE_STATE "state"
38#define ACPI_BUTTON_TYPE_UNKNOWN 0x00
39#define ACPI_BUTTON_NOTIFY_STATUS 0x80
40
41#define ACPI_BUTTON_SUBCLASS_POWER "power"
42#define ACPI_BUTTON_HID_POWER "PNP0C0C"
43#define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button"
44#define ACPI_BUTTON_TYPE_POWER 0x01
45
46#define ACPI_BUTTON_SUBCLASS_SLEEP "sleep"
47#define ACPI_BUTTON_HID_SLEEP "PNP0C0E"
48#define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button"
49#define ACPI_BUTTON_TYPE_SLEEP 0x03
50
51#define ACPI_BUTTON_SUBCLASS_LID "lid"
52#define ACPI_BUTTON_HID_LID "PNP0C0D"
53#define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch"
54#define ACPI_BUTTON_TYPE_LID 0x05
55
56#define _COMPONENT ACPI_BUTTON_COMPONENT
57ACPI_MODULE_NAME("button");
58
59MODULE_AUTHOR("Paul Diefenbaugh");
60MODULE_DESCRIPTION("ACPI Button Driver");
61MODULE_LICENSE("GPL");
62
63static const struct acpi_device_id button_device_ids[] = {
64 {ACPI_BUTTON_HID_LID, 0},
65 {ACPI_BUTTON_HID_SLEEP, 0},
66 {ACPI_BUTTON_HID_SLEEPF, 0},
67 {ACPI_BUTTON_HID_POWER, 0},
68 {ACPI_BUTTON_HID_POWERF, 0},
69 {"", 0},
70};
71MODULE_DEVICE_TABLE(acpi, button_device_ids);
72
73static int acpi_button_add(struct acpi_device *device);
74static int acpi_button_remove(struct acpi_device *device);
75static void acpi_button_notify(struct acpi_device *device, u32 event);
76
77#ifdef CONFIG_PM_SLEEP
78static int acpi_button_suspend(struct device *dev);
79static int acpi_button_resume(struct device *dev);
80#else
81#define acpi_button_suspend NULL
82#define acpi_button_resume NULL
83#endif
84static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, acpi_button_resume);
85
86static struct acpi_driver acpi_button_driver = {
87 .name = "button",
88 .class = ACPI_BUTTON_CLASS,
89 .ids = button_device_ids,
90 .ops = {
91 .add = acpi_button_add,
92 .remove = acpi_button_remove,
93 .notify = acpi_button_notify,
94 },
95 .drv.pm = &acpi_button_pm,
96};
97
98struct acpi_button {
99 unsigned int type;
100 struct input_dev *input;
101 char phys[32];
102 unsigned long pushed;
103 bool suspended;
104};
105
106static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
107static struct acpi_device *lid_device;
108
109
110
111
112
113static struct proc_dir_entry *acpi_button_dir;
114static struct proc_dir_entry *acpi_lid_dir;
115
116static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
117{
118 struct acpi_device *device = seq->private;
119 acpi_status status;
120 unsigned long long state;
121
122 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
123 seq_printf(seq, "state: %s\n",
124 ACPI_FAILURE(status) ? "unsupported" :
125 (state ? "open" : "closed"));
126 return 0;
127}
128
129static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
130{
131 return single_open(file, acpi_button_state_seq_show, PDE_DATA(inode));
132}
133
134static const struct file_operations acpi_button_state_fops = {
135 .owner = THIS_MODULE,
136 .open = acpi_button_state_open_fs,
137 .read = seq_read,
138 .llseek = seq_lseek,
139 .release = single_release,
140};
141
142static int acpi_button_add_fs(struct acpi_device *device)
143{
144 struct acpi_button *button = acpi_driver_data(device);
145 struct proc_dir_entry *entry = NULL;
146 int ret = 0;
147
148
149 if (button->type != ACPI_BUTTON_TYPE_LID)
150 return 0;
151
152 if (acpi_button_dir || acpi_lid_dir) {
153 printk(KERN_ERR PREFIX "More than one Lid device found!\n");
154 return -EEXIST;
155 }
156
157
158 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
159 if (!acpi_button_dir)
160 return -ENODEV;
161
162
163 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
164 if (!acpi_lid_dir) {
165 ret = -ENODEV;
166 goto remove_button_dir;
167 }
168
169
170 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
171 if (!acpi_device_dir(device)) {
172 ret = -ENODEV;
173 goto remove_lid_dir;
174 }
175
176
177 entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
178 S_IRUGO, acpi_device_dir(device),
179 &acpi_button_state_fops, device);
180 if (!entry) {
181 ret = -ENODEV;
182 goto remove_dev_dir;
183 }
184
185done:
186 return ret;
187
188remove_dev_dir:
189 remove_proc_entry(acpi_device_bid(device),
190 acpi_lid_dir);
191 acpi_device_dir(device) = NULL;
192remove_lid_dir:
193 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
194remove_button_dir:
195 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
196 goto done;
197}
198
199static int acpi_button_remove_fs(struct acpi_device *device)
200{
201 struct acpi_button *button = acpi_driver_data(device);
202
203 if (button->type != ACPI_BUTTON_TYPE_LID)
204 return 0;
205
206 remove_proc_entry(ACPI_BUTTON_FILE_STATE,
207 acpi_device_dir(device));
208 remove_proc_entry(acpi_device_bid(device),
209 acpi_lid_dir);
210 acpi_device_dir(device) = NULL;
211 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
212 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
213
214 return 0;
215}
216
217
218
219
220int acpi_lid_notifier_register(struct notifier_block *nb)
221{
222 return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
223}
224EXPORT_SYMBOL(acpi_lid_notifier_register);
225
226int acpi_lid_notifier_unregister(struct notifier_block *nb)
227{
228 return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
229}
230EXPORT_SYMBOL(acpi_lid_notifier_unregister);
231
232int acpi_lid_open(void)
233{
234 acpi_status status;
235 unsigned long long state;
236
237 if (!lid_device)
238 return -ENODEV;
239
240 status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
241 &state);
242 if (ACPI_FAILURE(status))
243 return -ENODEV;
244
245 return !!state;
246}
247EXPORT_SYMBOL(acpi_lid_open);
248
249static int acpi_lid_send_state(struct acpi_device *device)
250{
251 struct acpi_button *button = acpi_driver_data(device);
252 unsigned long long state;
253 acpi_status status;
254 int ret;
255
256 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
257 if (ACPI_FAILURE(status))
258 return -ENODEV;
259
260
261 input_report_switch(button->input, SW_LID, !state);
262 input_sync(button->input);
263
264 if (state)
265 pm_wakeup_event(&device->dev, 0);
266
267 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
268 if (ret == NOTIFY_DONE)
269 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
270 device);
271 if (ret == NOTIFY_DONE || ret == NOTIFY_OK) {
272
273
274
275
276 ret = 0;
277 }
278 return ret;
279}
280
281static void acpi_button_notify(struct acpi_device *device, u32 event)
282{
283 struct acpi_button *button = acpi_driver_data(device);
284 struct input_dev *input;
285
286 switch (event) {
287 case ACPI_FIXED_HARDWARE_EVENT:
288 event = ACPI_BUTTON_NOTIFY_STATUS;
289
290 case ACPI_BUTTON_NOTIFY_STATUS:
291 input = button->input;
292 if (button->type == ACPI_BUTTON_TYPE_LID) {
293 acpi_lid_send_state(device);
294 } else {
295 int keycode;
296
297 pm_wakeup_event(&device->dev, 0);
298 if (button->suspended)
299 break;
300
301 keycode = test_bit(KEY_SLEEP, input->keybit) ?
302 KEY_SLEEP : KEY_POWER;
303 input_report_key(input, keycode, 1);
304 input_sync(input);
305 input_report_key(input, keycode, 0);
306 input_sync(input);
307
308 acpi_bus_generate_netlink_event(
309 device->pnp.device_class,
310 dev_name(&device->dev),
311 event, ++button->pushed);
312 }
313 break;
314 default:
315 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
316 "Unsupported event [0x%x]\n", event));
317 break;
318 }
319}
320
321#ifdef CONFIG_PM_SLEEP
322static int acpi_button_suspend(struct device *dev)
323{
324 struct acpi_device *device = to_acpi_device(dev);
325 struct acpi_button *button = acpi_driver_data(device);
326
327 button->suspended = true;
328 return 0;
329}
330
331static int acpi_button_resume(struct device *dev)
332{
333 struct acpi_device *device = to_acpi_device(dev);
334 struct acpi_button *button = acpi_driver_data(device);
335
336 button->suspended = false;
337 if (button->type == ACPI_BUTTON_TYPE_LID)
338 return acpi_lid_send_state(device);
339 return 0;
340}
341#endif
342
343static int acpi_button_add(struct acpi_device *device)
344{
345 struct acpi_button *button;
346 struct input_dev *input;
347 const char *hid = acpi_device_hid(device);
348 char *name, *class;
349 int error;
350
351 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
352 if (!button)
353 return -ENOMEM;
354
355 device->driver_data = button;
356
357 button->input = input = input_allocate_device();
358 if (!input) {
359 error = -ENOMEM;
360 goto err_free_button;
361 }
362
363 name = acpi_device_name(device);
364 class = acpi_device_class(device);
365
366 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
367 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
368 button->type = ACPI_BUTTON_TYPE_POWER;
369 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
370 sprintf(class, "%s/%s",
371 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
372 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
373 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
374 button->type = ACPI_BUTTON_TYPE_SLEEP;
375 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
376 sprintf(class, "%s/%s",
377 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
378 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
379 button->type = ACPI_BUTTON_TYPE_LID;
380 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
381 sprintf(class, "%s/%s",
382 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
383 } else {
384 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
385 error = -ENODEV;
386 goto err_free_input;
387 }
388
389 error = acpi_button_add_fs(device);
390 if (error)
391 goto err_free_input;
392
393 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
394
395 input->name = name;
396 input->phys = button->phys;
397 input->id.bustype = BUS_HOST;
398 input->id.product = button->type;
399 input->dev.parent = &device->dev;
400
401 switch (button->type) {
402 case ACPI_BUTTON_TYPE_POWER:
403 input_set_capability(input, EV_KEY, KEY_POWER);
404 break;
405
406 case ACPI_BUTTON_TYPE_SLEEP:
407 input_set_capability(input, EV_KEY, KEY_SLEEP);
408 break;
409
410 case ACPI_BUTTON_TYPE_LID:
411 input_set_capability(input, EV_SW, SW_LID);
412 break;
413 }
414
415 error = input_register_device(input);
416 if (error)
417 goto err_remove_fs;
418 if (button->type == ACPI_BUTTON_TYPE_LID) {
419 acpi_lid_send_state(device);
420
421
422
423
424 lid_device = device;
425 }
426
427 printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
428 return 0;
429
430 err_remove_fs:
431 acpi_button_remove_fs(device);
432 err_free_input:
433 input_free_device(input);
434 err_free_button:
435 kfree(button);
436 return error;
437}
438
439static int acpi_button_remove(struct acpi_device *device)
440{
441 struct acpi_button *button = acpi_driver_data(device);
442
443 acpi_button_remove_fs(device);
444 input_unregister_device(button->input);
445 kfree(button);
446 return 0;
447}
448
449module_acpi_driver(acpi_button_driver);
450
