Commit | Line | Data |
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ee027e4a YW |
1 | /* |
2 | * Eee PC WMI hotkey driver | |
3 | * | |
4 | * Copyright(C) 2010 Intel Corporation. | |
5 | * | |
6 | * Portions based on wistron_btns.c: | |
7 | * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz> | |
8 | * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org> | |
9 | * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
24 | */ | |
25 | ||
81248889 YW |
26 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
27 | ||
ee027e4a YW |
28 | #include <linux/kernel.h> |
29 | #include <linux/module.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/types.h> | |
a32f3926 | 32 | #include <linux/slab.h> |
ee027e4a YW |
33 | #include <linux/input.h> |
34 | #include <linux/input/sparse-keymap.h> | |
3d7b1655 YW |
35 | #include <linux/fb.h> |
36 | #include <linux/backlight.h> | |
45f2c693 | 37 | #include <linux/platform_device.h> |
ee027e4a YW |
38 | #include <acpi/acpi_bus.h> |
39 | #include <acpi/acpi_drivers.h> | |
40 | ||
45f2c693 YW |
41 | #define EEEPC_WMI_FILE "eeepc-wmi" |
42 | ||
ee027e4a YW |
43 | MODULE_AUTHOR("Yong Wang <yong.y.wang@intel.com>"); |
44 | MODULE_DESCRIPTION("Eee PC WMI Hotkey Driver"); | |
45 | MODULE_LICENSE("GPL"); | |
46 | ||
47 | #define EEEPC_WMI_EVENT_GUID "ABBC0F72-8EA1-11D1-00A0-C90629100000" | |
3d7b1655 | 48 | #define EEEPC_WMI_MGMT_GUID "97845ED0-4E6D-11DE-8A39-0800200C9A66" |
ee027e4a YW |
49 | |
50 | MODULE_ALIAS("wmi:"EEEPC_WMI_EVENT_GUID); | |
3d7b1655 | 51 | MODULE_ALIAS("wmi:"EEEPC_WMI_MGMT_GUID); |
ee027e4a YW |
52 | |
53 | #define NOTIFY_BRNUP_MIN 0x11 | |
54 | #define NOTIFY_BRNUP_MAX 0x1f | |
55 | #define NOTIFY_BRNDOWN_MIN 0x20 | |
56 | #define NOTIFY_BRNDOWN_MAX 0x2e | |
57 | ||
3d7b1655 YW |
58 | #define EEEPC_WMI_METHODID_DEVS 0x53564544 |
59 | #define EEEPC_WMI_METHODID_DSTS 0x53544344 | |
60 | ||
61 | #define EEEPC_WMI_DEVID_BACKLIGHT 0x00050012 | |
62 | ||
ee027e4a YW |
63 | static const struct key_entry eeepc_wmi_keymap[] = { |
64 | /* Sleep already handled via generic ACPI code */ | |
65 | { KE_KEY, 0x5d, { KEY_WLAN } }, | |
66 | { KE_KEY, 0x32, { KEY_MUTE } }, | |
67 | { KE_KEY, 0x31, { KEY_VOLUMEDOWN } }, | |
68 | { KE_KEY, 0x30, { KEY_VOLUMEUP } }, | |
69 | { KE_IGNORE, NOTIFY_BRNDOWN_MIN, { KEY_BRIGHTNESSDOWN } }, | |
70 | { KE_IGNORE, NOTIFY_BRNUP_MIN, { KEY_BRIGHTNESSUP } }, | |
71 | { KE_KEY, 0xcc, { KEY_SWITCHVIDEOMODE } }, | |
72 | { KE_END, 0}, | |
73 | }; | |
74 | ||
3d7b1655 YW |
75 | struct bios_args { |
76 | u32 dev_id; | |
77 | u32 ctrl_param; | |
78 | }; | |
79 | ||
81248889 YW |
80 | struct eeepc_wmi { |
81 | struct input_dev *inputdev; | |
3d7b1655 | 82 | struct backlight_device *backlight_device; |
81248889 YW |
83 | }; |
84 | ||
45f2c693 | 85 | static struct platform_device *platform_device; |
ee027e4a | 86 | |
81248889 | 87 | static int eeepc_wmi_input_init(struct eeepc_wmi *eeepc) |
ee027e4a YW |
88 | { |
89 | int err; | |
90 | ||
81248889 YW |
91 | eeepc->inputdev = input_allocate_device(); |
92 | if (!eeepc->inputdev) | |
ee027e4a YW |
93 | return -ENOMEM; |
94 | ||
81248889 | 95 | eeepc->inputdev->name = "Eee PC WMI hotkeys"; |
45f2c693 | 96 | eeepc->inputdev->phys = EEEPC_WMI_FILE "/input0"; |
81248889 | 97 | eeepc->inputdev->id.bustype = BUS_HOST; |
45f2c693 | 98 | eeepc->inputdev->dev.parent = &platform_device->dev; |
ee027e4a | 99 | |
81248889 | 100 | err = sparse_keymap_setup(eeepc->inputdev, eeepc_wmi_keymap, NULL); |
ee027e4a YW |
101 | if (err) |
102 | goto err_free_dev; | |
103 | ||
81248889 | 104 | err = input_register_device(eeepc->inputdev); |
ee027e4a YW |
105 | if (err) |
106 | goto err_free_keymap; | |
107 | ||
108 | return 0; | |
109 | ||
110 | err_free_keymap: | |
81248889 | 111 | sparse_keymap_free(eeepc->inputdev); |
ee027e4a | 112 | err_free_dev: |
81248889 | 113 | input_free_device(eeepc->inputdev); |
ee027e4a YW |
114 | return err; |
115 | } | |
116 | ||
81248889 YW |
117 | static void eeepc_wmi_input_exit(struct eeepc_wmi *eeepc) |
118 | { | |
119 | if (eeepc->inputdev) { | |
120 | sparse_keymap_free(eeepc->inputdev); | |
121 | input_unregister_device(eeepc->inputdev); | |
122 | } | |
123 | ||
124 | eeepc->inputdev = NULL; | |
125 | } | |
126 | ||
3d7b1655 YW |
127 | static acpi_status eeepc_wmi_get_devstate(u32 dev_id, u32 *ctrl_param) |
128 | { | |
129 | struct acpi_buffer input = { (acpi_size)sizeof(u32), &dev_id }; | |
130 | struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; | |
131 | union acpi_object *obj; | |
132 | acpi_status status; | |
133 | u32 tmp; | |
134 | ||
135 | status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID, | |
136 | 1, EEEPC_WMI_METHODID_DSTS, &input, &output); | |
137 | ||
138 | if (ACPI_FAILURE(status)) | |
139 | return status; | |
140 | ||
141 | obj = (union acpi_object *)output.pointer; | |
142 | if (obj && obj->type == ACPI_TYPE_INTEGER) | |
143 | tmp = (u32)obj->integer.value; | |
144 | else | |
145 | tmp = 0; | |
146 | ||
147 | if (ctrl_param) | |
148 | *ctrl_param = tmp; | |
149 | ||
150 | kfree(obj); | |
151 | ||
152 | return status; | |
153 | ||
154 | } | |
155 | ||
156 | static acpi_status eeepc_wmi_set_devstate(u32 dev_id, u32 ctrl_param) | |
157 | { | |
158 | struct bios_args args = { | |
159 | .dev_id = dev_id, | |
160 | .ctrl_param = ctrl_param, | |
161 | }; | |
162 | struct acpi_buffer input = { (acpi_size)sizeof(args), &args }; | |
163 | acpi_status status; | |
164 | ||
165 | status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID, | |
166 | 1, EEEPC_WMI_METHODID_DEVS, &input, NULL); | |
167 | ||
168 | return status; | |
169 | } | |
170 | ||
171 | static int read_brightness(struct backlight_device *bd) | |
172 | { | |
173 | static u32 ctrl_param; | |
174 | acpi_status status; | |
175 | ||
176 | status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_BACKLIGHT, &ctrl_param); | |
177 | ||
178 | if (ACPI_FAILURE(status)) | |
179 | return -1; | |
180 | else | |
181 | return ctrl_param & 0xFF; | |
182 | } | |
183 | ||
184 | static int update_bl_status(struct backlight_device *bd) | |
185 | { | |
186 | ||
187 | static u32 ctrl_param; | |
188 | acpi_status status; | |
189 | ||
190 | ctrl_param = bd->props.brightness; | |
191 | ||
192 | status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BACKLIGHT, ctrl_param); | |
193 | ||
194 | if (ACPI_FAILURE(status)) | |
195 | return -1; | |
196 | else | |
197 | return 0; | |
198 | } | |
199 | ||
200 | static const struct backlight_ops eeepc_wmi_bl_ops = { | |
201 | .get_brightness = read_brightness, | |
202 | .update_status = update_bl_status, | |
203 | }; | |
204 | ||
205 | static int eeepc_wmi_backlight_notify(struct eeepc_wmi *eeepc, int code) | |
206 | { | |
207 | struct backlight_device *bd = eeepc->backlight_device; | |
208 | int old = bd->props.brightness; | |
209 | int new; | |
210 | ||
211 | if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX) | |
212 | new = code - NOTIFY_BRNUP_MIN + 1; | |
213 | else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX) | |
214 | new = code - NOTIFY_BRNDOWN_MIN; | |
215 | ||
216 | bd->props.brightness = new; | |
217 | backlight_update_status(bd); | |
218 | backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY); | |
219 | ||
220 | return old; | |
221 | } | |
222 | ||
223 | static int eeepc_wmi_backlight_init(struct eeepc_wmi *eeepc) | |
224 | { | |
225 | struct backlight_device *bd; | |
226 | struct backlight_properties props; | |
227 | ||
228 | memset(&props, 0, sizeof(struct backlight_properties)); | |
229 | props.max_brightness = 15; | |
230 | bd = backlight_device_register(EEEPC_WMI_FILE, | |
231 | &platform_device->dev, eeepc, | |
232 | &eeepc_wmi_bl_ops, &props); | |
233 | if (IS_ERR(bd)) { | |
234 | pr_err("Could not register backlight device\n"); | |
235 | return PTR_ERR(bd); | |
236 | } | |
237 | ||
238 | eeepc->backlight_device = bd; | |
239 | ||
240 | bd->props.brightness = read_brightness(bd); | |
241 | bd->props.power = FB_BLANK_UNBLANK; | |
242 | backlight_update_status(bd); | |
243 | ||
244 | return 0; | |
245 | } | |
246 | ||
247 | static void eeepc_wmi_backlight_exit(struct eeepc_wmi *eeepc) | |
248 | { | |
249 | if (eeepc->backlight_device) | |
250 | backlight_device_unregister(eeepc->backlight_device); | |
251 | ||
252 | eeepc->backlight_device = NULL; | |
253 | } | |
254 | ||
255 | static void eeepc_wmi_notify(u32 value, void *context) | |
256 | { | |
257 | struct eeepc_wmi *eeepc = context; | |
258 | struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; | |
259 | union acpi_object *obj; | |
260 | acpi_status status; | |
261 | int code; | |
262 | int orig_code; | |
263 | ||
264 | status = wmi_get_event_data(value, &response); | |
265 | if (status != AE_OK) { | |
266 | pr_err("bad event status 0x%x\n", status); | |
267 | return; | |
268 | } | |
269 | ||
270 | obj = (union acpi_object *)response.pointer; | |
271 | ||
272 | if (obj && obj->type == ACPI_TYPE_INTEGER) { | |
273 | code = obj->integer.value; | |
274 | orig_code = code; | |
275 | ||
276 | if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX) | |
277 | code = NOTIFY_BRNUP_MIN; | |
278 | else if (code >= NOTIFY_BRNDOWN_MIN && | |
279 | code <= NOTIFY_BRNDOWN_MAX) | |
280 | code = NOTIFY_BRNDOWN_MIN; | |
281 | ||
282 | if (code == NOTIFY_BRNUP_MIN || code == NOTIFY_BRNDOWN_MIN) { | |
283 | if (!acpi_video_backlight_support()) | |
284 | eeepc_wmi_backlight_notify(eeepc, orig_code); | |
285 | } | |
286 | ||
287 | if (!sparse_keymap_report_event(eeepc->inputdev, | |
288 | code, 1, true)) | |
289 | pr_info("Unknown key %x pressed\n", code); | |
290 | } | |
291 | ||
292 | kfree(obj); | |
293 | } | |
294 | ||
45f2c693 | 295 | static int __devinit eeepc_wmi_platform_probe(struct platform_device *device) |
ee027e4a | 296 | { |
45f2c693 | 297 | struct eeepc_wmi *eeepc; |
ee027e4a YW |
298 | int err; |
299 | acpi_status status; | |
300 | ||
45f2c693 YW |
301 | eeepc = platform_get_drvdata(device); |
302 | ||
303 | err = eeepc_wmi_input_init(eeepc); | |
304 | if (err) | |
3d7b1655 YW |
305 | goto error_input; |
306 | ||
307 | if (!acpi_video_backlight_support()) { | |
308 | err = eeepc_wmi_backlight_init(eeepc); | |
309 | if (err) | |
310 | goto error_backlight; | |
311 | } else | |
312 | pr_info("Backlight controlled by ACPI video driver\n"); | |
45f2c693 YW |
313 | |
314 | status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID, | |
315 | eeepc_wmi_notify, eeepc); | |
316 | if (ACPI_FAILURE(status)) { | |
317 | pr_err("Unable to register notify handler - %d\n", | |
318 | status); | |
319 | err = -ENODEV; | |
320 | goto error_wmi; | |
321 | } | |
322 | ||
323 | return 0; | |
324 | ||
325 | error_wmi: | |
3d7b1655 YW |
326 | eeepc_wmi_backlight_exit(eeepc); |
327 | error_backlight: | |
45f2c693 | 328 | eeepc_wmi_input_exit(eeepc); |
3d7b1655 | 329 | error_input: |
45f2c693 YW |
330 | return err; |
331 | } | |
332 | ||
333 | static int __devexit eeepc_wmi_platform_remove(struct platform_device *device) | |
334 | { | |
335 | struct eeepc_wmi *eeepc; | |
336 | ||
337 | eeepc = platform_get_drvdata(device); | |
338 | wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID); | |
3d7b1655 | 339 | eeepc_wmi_backlight_exit(eeepc); |
45f2c693 YW |
340 | eeepc_wmi_input_exit(eeepc); |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | static struct platform_driver platform_driver = { | |
346 | .driver = { | |
347 | .name = EEEPC_WMI_FILE, | |
348 | .owner = THIS_MODULE, | |
349 | }, | |
350 | .probe = eeepc_wmi_platform_probe, | |
351 | .remove = __devexit_p(eeepc_wmi_platform_remove), | |
352 | }; | |
353 | ||
354 | static int __init eeepc_wmi_init(void) | |
355 | { | |
356 | struct eeepc_wmi *eeepc; | |
357 | int err; | |
358 | ||
3d7b1655 YW |
359 | if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID) || |
360 | !wmi_has_guid(EEEPC_WMI_MGMT_GUID)) { | |
81248889 | 361 | pr_warning("No known WMI GUID found\n"); |
ee027e4a YW |
362 | return -ENODEV; |
363 | } | |
364 | ||
81248889 YW |
365 | eeepc = kzalloc(sizeof(struct eeepc_wmi), GFP_KERNEL); |
366 | if (!eeepc) | |
367 | return -ENOMEM; | |
368 | ||
45f2c693 YW |
369 | platform_device = platform_device_alloc(EEEPC_WMI_FILE, -1); |
370 | if (!platform_device) { | |
371 | pr_warning("Unable to allocate platform device\n"); | |
372 | err = -ENOMEM; | |
373 | goto fail_platform; | |
374 | } | |
375 | ||
376 | err = platform_device_add(platform_device); | |
81248889 | 377 | if (err) { |
45f2c693 YW |
378 | pr_warning("Unable to add platform device\n"); |
379 | goto put_dev; | |
81248889 | 380 | } |
ee027e4a | 381 | |
45f2c693 YW |
382 | platform_set_drvdata(platform_device, eeepc); |
383 | ||
384 | err = platform_driver_register(&platform_driver); | |
385 | if (err) { | |
386 | pr_warning("Unable to register platform driver\n"); | |
387 | goto del_dev; | |
ee027e4a YW |
388 | } |
389 | ||
390 | return 0; | |
45f2c693 YW |
391 | |
392 | del_dev: | |
393 | platform_device_del(platform_device); | |
394 | put_dev: | |
395 | platform_device_put(platform_device); | |
396 | fail_platform: | |
397 | kfree(eeepc); | |
398 | ||
399 | return err; | |
ee027e4a YW |
400 | } |
401 | ||
402 | static void __exit eeepc_wmi_exit(void) | |
403 | { | |
45f2c693 YW |
404 | struct eeepc_wmi *eeepc; |
405 | ||
406 | eeepc = platform_get_drvdata(platform_device); | |
407 | platform_driver_unregister(&platform_driver); | |
408 | platform_device_unregister(platform_device); | |
81248889 | 409 | kfree(eeepc); |
ee027e4a YW |
410 | } |
411 | ||
412 | module_init(eeepc_wmi_init); | |
413 | module_exit(eeepc_wmi_exit); |