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1/*
2 * button.c - ACPI Button Driver
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/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]; /* for input device */
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 FS Interface (/proc)
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 /* procfs I/F for ACPI lid device only */
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 /* create /proc/acpi/button */
158 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
159 if (!acpi_button_dir)
160 return -ENODEV;
161
162 /* create /proc/acpi/button/lid */
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 /* create /proc/acpi/button/lid/LID/ */
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 /* create /proc/acpi/button/lid/LID/state */
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 Driver Interface
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 /* input layer checks if event is redundant */
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 * It is also regarded as success if the notifier_chain
274 * returns NOTIFY_OK or NOTIFY_DONE.
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 /* fall through */
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 * This assumes there's only one lid device, or if there are
422 * more we only care about the last one...
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);
1/*
2 * button.c - ACPI Button Driver
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#define pr_fmt(fmt) "ACPI : button: " fmt
23
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/types.h>
28#include <linux/proc_fs.h>
29#include <linux/seq_file.h>
30#include <linux/input.h>
31#include <linux/slab.h>
32#include <linux/acpi.h>
33#include <acpi/button.h>
34
35#define PREFIX "ACPI: "
36
37#define ACPI_BUTTON_CLASS "button"
38#define ACPI_BUTTON_FILE_INFO "info"
39#define ACPI_BUTTON_FILE_STATE "state"
40#define ACPI_BUTTON_TYPE_UNKNOWN 0x00
41#define ACPI_BUTTON_NOTIFY_STATUS 0x80
42
43#define ACPI_BUTTON_SUBCLASS_POWER "power"
44#define ACPI_BUTTON_HID_POWER "PNP0C0C"
45#define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button"
46#define ACPI_BUTTON_TYPE_POWER 0x01
47
48#define ACPI_BUTTON_SUBCLASS_SLEEP "sleep"
49#define ACPI_BUTTON_HID_SLEEP "PNP0C0E"
50#define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button"
51#define ACPI_BUTTON_TYPE_SLEEP 0x03
52
53#define ACPI_BUTTON_SUBCLASS_LID "lid"
54#define ACPI_BUTTON_HID_LID "PNP0C0D"
55#define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch"
56#define ACPI_BUTTON_TYPE_LID 0x05
57
58#define ACPI_BUTTON_LID_INIT_IGNORE 0x00
59#define ACPI_BUTTON_LID_INIT_OPEN 0x01
60#define ACPI_BUTTON_LID_INIT_METHOD 0x02
61
62#define _COMPONENT ACPI_BUTTON_COMPONENT
63ACPI_MODULE_NAME("button");
64
65MODULE_AUTHOR("Paul Diefenbaugh");
66MODULE_DESCRIPTION("ACPI Button Driver");
67MODULE_LICENSE("GPL");
68
69static const struct acpi_device_id button_device_ids[] = {
70 {ACPI_BUTTON_HID_LID, 0},
71 {ACPI_BUTTON_HID_SLEEP, 0},
72 {ACPI_BUTTON_HID_SLEEPF, 0},
73 {ACPI_BUTTON_HID_POWER, 0},
74 {ACPI_BUTTON_HID_POWERF, 0},
75 {"", 0},
76};
77MODULE_DEVICE_TABLE(acpi, button_device_ids);
78
79static int acpi_button_add(struct acpi_device *device);
80static int acpi_button_remove(struct acpi_device *device);
81static void acpi_button_notify(struct acpi_device *device, u32 event);
82
83#ifdef CONFIG_PM_SLEEP
84static int acpi_button_suspend(struct device *dev);
85static int acpi_button_resume(struct device *dev);
86#else
87#define acpi_button_suspend NULL
88#define acpi_button_resume NULL
89#endif
90static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, acpi_button_resume);
91
92static struct acpi_driver acpi_button_driver = {
93 .name = "button",
94 .class = ACPI_BUTTON_CLASS,
95 .ids = button_device_ids,
96 .ops = {
97 .add = acpi_button_add,
98 .remove = acpi_button_remove,
99 .notify = acpi_button_notify,
100 },
101 .drv.pm = &acpi_button_pm,
102};
103
104struct acpi_button {
105 unsigned int type;
106 struct input_dev *input;
107 char phys[32]; /* for input device */
108 unsigned long pushed;
109 int last_state;
110 ktime_t last_time;
111 bool suspended;
112};
113
114static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
115static struct acpi_device *lid_device;
116static u8 lid_init_state = ACPI_BUTTON_LID_INIT_OPEN;
117
118static unsigned long lid_report_interval __read_mostly = 500;
119module_param(lid_report_interval, ulong, 0644);
120MODULE_PARM_DESC(lid_report_interval, "Interval (ms) between lid key events");
121
122/* --------------------------------------------------------------------------
123 FS Interface (/proc)
124 -------------------------------------------------------------------------- */
125
126static struct proc_dir_entry *acpi_button_dir;
127static struct proc_dir_entry *acpi_lid_dir;
128
129static int acpi_lid_evaluate_state(struct acpi_device *device)
130{
131 unsigned long long lid_state;
132 acpi_status status;
133
134 status = acpi_evaluate_integer(device->handle, "_LID", NULL, &lid_state);
135 if (ACPI_FAILURE(status))
136 return -ENODEV;
137
138 return lid_state ? 1 : 0;
139}
140
141static int acpi_lid_notify_state(struct acpi_device *device, int state)
142{
143 struct acpi_button *button = acpi_driver_data(device);
144 int ret;
145 ktime_t next_report;
146 bool do_update;
147
148 /*
149 * In lid_init_state=ignore mode, if user opens/closes lid
150 * frequently with "open" missing, and "last_time" is also updated
151 * frequently, "close" cannot be delivered to the userspace.
152 * So "last_time" is only updated after a timeout or an actual
153 * switch.
154 */
155 if (lid_init_state != ACPI_BUTTON_LID_INIT_IGNORE ||
156 button->last_state != !!state)
157 do_update = true;
158 else
159 do_update = false;
160
161 next_report = ktime_add(button->last_time,
162 ms_to_ktime(lid_report_interval));
163 if (button->last_state == !!state &&
164 ktime_after(ktime_get(), next_report)) {
165 /* Complain the buggy firmware */
166 pr_warn_once("The lid device is not compliant to SW_LID.\n");
167
168 /*
169 * Send the unreliable complement switch event:
170 *
171 * On most platforms, the lid device is reliable. However
172 * there are exceptions:
173 * 1. Platforms returning initial lid state as "close" by
174 * default after booting/resuming:
175 * https://bugzilla.kernel.org/show_bug.cgi?id=89211
176 * https://bugzilla.kernel.org/show_bug.cgi?id=106151
177 * 2. Platforms never reporting "open" events:
178 * https://bugzilla.kernel.org/show_bug.cgi?id=106941
179 * On these buggy platforms, the usage model of the ACPI
180 * lid device actually is:
181 * 1. The initial returning value of _LID may not be
182 * reliable.
183 * 2. The open event may not be reliable.
184 * 3. The close event is reliable.
185 *
186 * But SW_LID is typed as input switch event, the input
187 * layer checks if the event is redundant. Hence if the
188 * state is not switched, the userspace cannot see this
189 * platform triggered reliable event. By inserting a
190 * complement switch event, it then is guaranteed that the
191 * platform triggered reliable one can always be seen by
192 * the userspace.
193 */
194 if (lid_init_state == ACPI_BUTTON_LID_INIT_IGNORE) {
195 do_update = true;
196 /*
197 * Do generate complement switch event for "close"
198 * as "close" is reliable and wrong "open" won't
199 * trigger unexpected behaviors.
200 * Do not generate complement switch event for
201 * "open" as "open" is not reliable and wrong
202 * "close" will trigger unexpected behaviors.
203 */
204 if (!state) {
205 input_report_switch(button->input,
206 SW_LID, state);
207 input_sync(button->input);
208 }
209 }
210 }
211 /* Send the platform triggered reliable event */
212 if (do_update) {
213 input_report_switch(button->input, SW_LID, !state);
214 input_sync(button->input);
215 button->last_state = !!state;
216 button->last_time = ktime_get();
217 }
218
219 if (state)
220 pm_wakeup_event(&device->dev, 0);
221
222 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
223 if (ret == NOTIFY_DONE)
224 ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
225 device);
226 if (ret == NOTIFY_DONE || ret == NOTIFY_OK) {
227 /*
228 * It is also regarded as success if the notifier_chain
229 * returns NOTIFY_OK or NOTIFY_DONE.
230 */
231 ret = 0;
232 }
233 return ret;
234}
235
236static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
237{
238 struct acpi_device *device = seq->private;
239 int state;
240
241 state = acpi_lid_evaluate_state(device);
242 seq_printf(seq, "state: %s\n",
243 state < 0 ? "unsupported" : (state ? "open" : "closed"));
244 return 0;
245}
246
247static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
248{
249 return single_open(file, acpi_button_state_seq_show, PDE_DATA(inode));
250}
251
252static const struct file_operations acpi_button_state_fops = {
253 .owner = THIS_MODULE,
254 .open = acpi_button_state_open_fs,
255 .read = seq_read,
256 .llseek = seq_lseek,
257 .release = single_release,
258};
259
260static int acpi_button_add_fs(struct acpi_device *device)
261{
262 struct acpi_button *button = acpi_driver_data(device);
263 struct proc_dir_entry *entry = NULL;
264 int ret = 0;
265
266 /* procfs I/F for ACPI lid device only */
267 if (button->type != ACPI_BUTTON_TYPE_LID)
268 return 0;
269
270 if (acpi_button_dir || acpi_lid_dir) {
271 printk(KERN_ERR PREFIX "More than one Lid device found!\n");
272 return -EEXIST;
273 }
274
275 /* create /proc/acpi/button */
276 acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
277 if (!acpi_button_dir)
278 return -ENODEV;
279
280 /* create /proc/acpi/button/lid */
281 acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
282 if (!acpi_lid_dir) {
283 ret = -ENODEV;
284 goto remove_button_dir;
285 }
286
287 /* create /proc/acpi/button/lid/LID/ */
288 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
289 if (!acpi_device_dir(device)) {
290 ret = -ENODEV;
291 goto remove_lid_dir;
292 }
293
294 /* create /proc/acpi/button/lid/LID/state */
295 entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
296 S_IRUGO, acpi_device_dir(device),
297 &acpi_button_state_fops, device);
298 if (!entry) {
299 ret = -ENODEV;
300 goto remove_dev_dir;
301 }
302
303done:
304 return ret;
305
306remove_dev_dir:
307 remove_proc_entry(acpi_device_bid(device),
308 acpi_lid_dir);
309 acpi_device_dir(device) = NULL;
310remove_lid_dir:
311 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
312 acpi_lid_dir = NULL;
313remove_button_dir:
314 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
315 acpi_button_dir = NULL;
316 goto done;
317}
318
319static int acpi_button_remove_fs(struct acpi_device *device)
320{
321 struct acpi_button *button = acpi_driver_data(device);
322
323 if (button->type != ACPI_BUTTON_TYPE_LID)
324 return 0;
325
326 remove_proc_entry(ACPI_BUTTON_FILE_STATE,
327 acpi_device_dir(device));
328 remove_proc_entry(acpi_device_bid(device),
329 acpi_lid_dir);
330 acpi_device_dir(device) = NULL;
331 remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
332 acpi_lid_dir = NULL;
333 remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
334 acpi_button_dir = NULL;
335
336 return 0;
337}
338
339/* --------------------------------------------------------------------------
340 Driver Interface
341 -------------------------------------------------------------------------- */
342int acpi_lid_notifier_register(struct notifier_block *nb)
343{
344 return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
345}
346EXPORT_SYMBOL(acpi_lid_notifier_register);
347
348int acpi_lid_notifier_unregister(struct notifier_block *nb)
349{
350 return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
351}
352EXPORT_SYMBOL(acpi_lid_notifier_unregister);
353
354int acpi_lid_open(void)
355{
356 if (!lid_device)
357 return -ENODEV;
358
359 return acpi_lid_evaluate_state(lid_device);
360}
361EXPORT_SYMBOL(acpi_lid_open);
362
363static int acpi_lid_update_state(struct acpi_device *device)
364{
365 int state;
366
367 state = acpi_lid_evaluate_state(device);
368 if (state < 0)
369 return state;
370
371 return acpi_lid_notify_state(device, state);
372}
373
374static void acpi_lid_initialize_state(struct acpi_device *device)
375{
376 switch (lid_init_state) {
377 case ACPI_BUTTON_LID_INIT_OPEN:
378 (void)acpi_lid_notify_state(device, 1);
379 break;
380 case ACPI_BUTTON_LID_INIT_METHOD:
381 (void)acpi_lid_update_state(device);
382 break;
383 case ACPI_BUTTON_LID_INIT_IGNORE:
384 default:
385 break;
386 }
387}
388
389static void acpi_button_notify(struct acpi_device *device, u32 event)
390{
391 struct acpi_button *button = acpi_driver_data(device);
392 struct input_dev *input;
393
394 switch (event) {
395 case ACPI_FIXED_HARDWARE_EVENT:
396 event = ACPI_BUTTON_NOTIFY_STATUS;
397 /* fall through */
398 case ACPI_BUTTON_NOTIFY_STATUS:
399 input = button->input;
400 if (button->type == ACPI_BUTTON_TYPE_LID) {
401 acpi_lid_update_state(device);
402 } else {
403 int keycode;
404
405 pm_wakeup_event(&device->dev, 0);
406 if (button->suspended)
407 break;
408
409 keycode = test_bit(KEY_SLEEP, input->keybit) ?
410 KEY_SLEEP : KEY_POWER;
411 input_report_key(input, keycode, 1);
412 input_sync(input);
413 input_report_key(input, keycode, 0);
414 input_sync(input);
415
416 acpi_bus_generate_netlink_event(
417 device->pnp.device_class,
418 dev_name(&device->dev),
419 event, ++button->pushed);
420 }
421 break;
422 default:
423 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
424 "Unsupported event [0x%x]\n", event));
425 break;
426 }
427}
428
429#ifdef CONFIG_PM_SLEEP
430static int acpi_button_suspend(struct device *dev)
431{
432 struct acpi_device *device = to_acpi_device(dev);
433 struct acpi_button *button = acpi_driver_data(device);
434
435 button->suspended = true;
436 return 0;
437}
438
439static int acpi_button_resume(struct device *dev)
440{
441 struct acpi_device *device = to_acpi_device(dev);
442 struct acpi_button *button = acpi_driver_data(device);
443
444 button->suspended = false;
445 if (button->type == ACPI_BUTTON_TYPE_LID)
446 acpi_lid_initialize_state(device);
447 return 0;
448}
449#endif
450
451static int acpi_button_add(struct acpi_device *device)
452{
453 struct acpi_button *button;
454 struct input_dev *input;
455 const char *hid = acpi_device_hid(device);
456 char *name, *class;
457 int error;
458
459 button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
460 if (!button)
461 return -ENOMEM;
462
463 device->driver_data = button;
464
465 button->input = input = input_allocate_device();
466 if (!input) {
467 error = -ENOMEM;
468 goto err_free_button;
469 }
470
471 name = acpi_device_name(device);
472 class = acpi_device_class(device);
473
474 if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
475 !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
476 button->type = ACPI_BUTTON_TYPE_POWER;
477 strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
478 sprintf(class, "%s/%s",
479 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
480 } else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
481 !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
482 button->type = ACPI_BUTTON_TYPE_SLEEP;
483 strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
484 sprintf(class, "%s/%s",
485 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
486 } else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
487 button->type = ACPI_BUTTON_TYPE_LID;
488 strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
489 sprintf(class, "%s/%s",
490 ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
491 button->last_state = !!acpi_lid_evaluate_state(device);
492 button->last_time = ktime_get();
493 } else {
494 printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
495 error = -ENODEV;
496 goto err_free_input;
497 }
498
499 error = acpi_button_add_fs(device);
500 if (error)
501 goto err_free_input;
502
503 snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
504
505 input->name = name;
506 input->phys = button->phys;
507 input->id.bustype = BUS_HOST;
508 input->id.product = button->type;
509 input->dev.parent = &device->dev;
510
511 switch (button->type) {
512 case ACPI_BUTTON_TYPE_POWER:
513 input_set_capability(input, EV_KEY, KEY_POWER);
514 break;
515
516 case ACPI_BUTTON_TYPE_SLEEP:
517 input_set_capability(input, EV_KEY, KEY_SLEEP);
518 break;
519
520 case ACPI_BUTTON_TYPE_LID:
521 input_set_capability(input, EV_SW, SW_LID);
522 break;
523 }
524
525 error = input_register_device(input);
526 if (error)
527 goto err_remove_fs;
528 if (button->type == ACPI_BUTTON_TYPE_LID) {
529 acpi_lid_initialize_state(device);
530 /*
531 * This assumes there's only one lid device, or if there are
532 * more we only care about the last one...
533 */
534 lid_device = device;
535 }
536
537 printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
538 return 0;
539
540 err_remove_fs:
541 acpi_button_remove_fs(device);
542 err_free_input:
543 input_free_device(input);
544 err_free_button:
545 kfree(button);
546 return error;
547}
548
549static int acpi_button_remove(struct acpi_device *device)
550{
551 struct acpi_button *button = acpi_driver_data(device);
552
553 acpi_button_remove_fs(device);
554 input_unregister_device(button->input);
555 kfree(button);
556 return 0;
557}
558
559static int param_set_lid_init_state(const char *val, struct kernel_param *kp)
560{
561 int result = 0;
562
563 if (!strncmp(val, "open", sizeof("open") - 1)) {
564 lid_init_state = ACPI_BUTTON_LID_INIT_OPEN;
565 pr_info("Notify initial lid state as open\n");
566 } else if (!strncmp(val, "method", sizeof("method") - 1)) {
567 lid_init_state = ACPI_BUTTON_LID_INIT_METHOD;
568 pr_info("Notify initial lid state with _LID return value\n");
569 } else if (!strncmp(val, "ignore", sizeof("ignore") - 1)) {
570 lid_init_state = ACPI_BUTTON_LID_INIT_IGNORE;
571 pr_info("Do not notify initial lid state\n");
572 } else
573 result = -EINVAL;
574 return result;
575}
576
577static int param_get_lid_init_state(char *buffer, struct kernel_param *kp)
578{
579 switch (lid_init_state) {
580 case ACPI_BUTTON_LID_INIT_OPEN:
581 return sprintf(buffer, "open");
582 case ACPI_BUTTON_LID_INIT_METHOD:
583 return sprintf(buffer, "method");
584 case ACPI_BUTTON_LID_INIT_IGNORE:
585 return sprintf(buffer, "ignore");
586 default:
587 return sprintf(buffer, "invalid");
588 }
589 return 0;
590}
591
592module_param_call(lid_init_state,
593 param_set_lid_init_state, param_get_lid_init_state,
594 NULL, 0644);
595MODULE_PARM_DESC(lid_init_state, "Behavior for reporting LID initial state");
596
597module_acpi_driver(acpi_button_driver);