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