Merge branch 'x86-geode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[pandora-kernel.git] / drivers / platform / x86 / msi-wmi.c
1 /*
2  * MSI WMI hotkeys
3  *
4  * Copyright (C) 2009 Novell <trenn@suse.de>
5  *
6  * Most stuff taken over from hp-wmi
7  *
8  *  This program is free software; you can redistribute it and/or modify
9  *  it under the terms of the GNU General Public License as published by
10  *  the Free Software Foundation; either version 2 of the License, or
11  *  (at your option) any later version.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to the Free Software
20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21  */
22
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25 #include <linux/kernel.h>
26 #include <linux/input.h>
27 #include <linux/input/sparse-keymap.h>
28 #include <linux/acpi.h>
29 #include <linux/backlight.h>
30 #include <linux/slab.h>
31
32 MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
33 MODULE_DESCRIPTION("MSI laptop WMI hotkeys driver");
34 MODULE_LICENSE("GPL");
35
36 MODULE_ALIAS("wmi:551A1F84-FBDD-4125-91DB-3EA8F44F1D45");
37 MODULE_ALIAS("wmi:B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2");
38
39 #define DRV_NAME "msi-wmi"
40
41 #define MSIWMI_BIOS_GUID "551A1F84-FBDD-4125-91DB-3EA8F44F1D45"
42 #define MSIWMI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"
43
44 #define SCANCODE_BASE 0xD0
45 #define MSI_WMI_BRIGHTNESSUP   SCANCODE_BASE
46 #define MSI_WMI_BRIGHTNESSDOWN (SCANCODE_BASE + 1)
47 #define MSI_WMI_VOLUMEUP       (SCANCODE_BASE + 2)
48 #define MSI_WMI_VOLUMEDOWN     (SCANCODE_BASE + 3)
49 #define MSI_WMI_MUTE           (SCANCODE_BASE + 4)
50 static struct key_entry msi_wmi_keymap[] = {
51         { KE_KEY, MSI_WMI_BRIGHTNESSUP,   {KEY_BRIGHTNESSUP} },
52         { KE_KEY, MSI_WMI_BRIGHTNESSDOWN, {KEY_BRIGHTNESSDOWN} },
53         { KE_KEY, MSI_WMI_VOLUMEUP,       {KEY_VOLUMEUP} },
54         { KE_KEY, MSI_WMI_VOLUMEDOWN,     {KEY_VOLUMEDOWN} },
55         { KE_KEY, MSI_WMI_MUTE,           {KEY_MUTE} },
56         { KE_END, 0}
57 };
58 static ktime_t last_pressed[ARRAY_SIZE(msi_wmi_keymap) - 1];
59
60 static struct backlight_device *backlight;
61
62 static int backlight_map[] = { 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF };
63
64 static struct input_dev *msi_wmi_input_dev;
65
66 static int msi_wmi_query_block(int instance, int *ret)
67 {
68         acpi_status status;
69         union acpi_object *obj;
70
71         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
72
73         status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output);
74
75         obj = output.pointer;
76
77         if (!obj || obj->type != ACPI_TYPE_INTEGER) {
78                 if (obj) {
79                         pr_err("query block returned object "
80                                "type: %d - buffer length:%d\n", obj->type,
81                                obj->type == ACPI_TYPE_BUFFER ?
82                                obj->buffer.length : 0);
83                 }
84                 kfree(obj);
85                 return -EINVAL;
86         }
87         *ret = obj->integer.value;
88         kfree(obj);
89         return 0;
90 }
91
92 static int msi_wmi_set_block(int instance, int value)
93 {
94         acpi_status status;
95
96         struct acpi_buffer input = { sizeof(int), &value };
97
98         pr_debug("Going to set block of instance: %d - value: %d\n",
99                  instance, value);
100
101         status = wmi_set_block(MSIWMI_BIOS_GUID, instance, &input);
102
103         return ACPI_SUCCESS(status) ? 0 : 1;
104 }
105
106 static int bl_get(struct backlight_device *bd)
107 {
108         int level, err, ret;
109
110         /* Instance 1 is "get backlight", cmp with DSDT */
111         err = msi_wmi_query_block(1, &ret);
112         if (err) {
113                 pr_err("Could not query backlight: %d\n", err);
114                 return -EINVAL;
115         }
116         pr_debug("Get: Query block returned: %d\n", ret);
117         for (level = 0; level < ARRAY_SIZE(backlight_map); level++) {
118                 if (backlight_map[level] == ret) {
119                         pr_debug("Current backlight level: 0x%X - index: %d\n",
120                                  backlight_map[level], level);
121                         break;
122                 }
123         }
124         if (level == ARRAY_SIZE(backlight_map)) {
125                 pr_err("get: Invalid brightness value: 0x%X\n", ret);
126                 return -EINVAL;
127         }
128         return level;
129 }
130
131 static int bl_set_status(struct backlight_device *bd)
132 {
133         int bright = bd->props.brightness;
134         if (bright >= ARRAY_SIZE(backlight_map) || bright < 0)
135                 return -EINVAL;
136
137         /* Instance 0 is "set backlight" */
138         return msi_wmi_set_block(0, backlight_map[bright]);
139 }
140
141 static const struct backlight_ops msi_backlight_ops = {
142         .get_brightness = bl_get,
143         .update_status  = bl_set_status,
144 };
145
146 static void msi_wmi_notify(u32 value, void *context)
147 {
148         struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
149         static struct key_entry *key;
150         union acpi_object *obj;
151         ktime_t cur;
152         acpi_status status;
153
154         status = wmi_get_event_data(value, &response);
155         if (status != AE_OK) {
156                 pr_info("bad event status 0x%x\n", status);
157                 return;
158         }
159
160         obj = (union acpi_object *)response.pointer;
161
162         if (obj && obj->type == ACPI_TYPE_INTEGER) {
163                 int eventcode = obj->integer.value;
164                 pr_debug("Eventcode: 0x%x\n", eventcode);
165                 key = sparse_keymap_entry_from_scancode(msi_wmi_input_dev,
166                                 eventcode);
167                 if (key) {
168                         ktime_t diff;
169                         cur = ktime_get_real();
170                         diff = ktime_sub(cur, last_pressed[key->code -
171                                         SCANCODE_BASE]);
172                         /* Ignore event if the same event happened in a 50 ms
173                            timeframe -> Key press may result in 10-20 GPEs */
174                         if (ktime_to_us(diff) < 1000 * 50) {
175                                 pr_debug("Suppressed key event 0x%X - "
176                                          "Last press was %lld us ago\n",
177                                          key->code, ktime_to_us(diff));
178                                 return;
179                         }
180                         last_pressed[key->code - SCANCODE_BASE] = cur;
181
182                         if (key->type == KE_KEY &&
183                         /* Brightness is served via acpi video driver */
184                         (!acpi_video_backlight_support() ||
185                         (key->code != MSI_WMI_BRIGHTNESSUP &&
186                         key->code != MSI_WMI_BRIGHTNESSDOWN))) {
187                                 pr_debug("Send key: 0x%X - "
188                                          "Input layer keycode: %d\n",
189                                          key->code, key->keycode);
190                                 sparse_keymap_report_entry(msi_wmi_input_dev,
191                                                 key, 1, true);
192                         }
193                 } else
194                         pr_info("Unknown key pressed - %x\n", eventcode);
195         } else
196                 pr_info("Unknown event received\n");
197         kfree(response.pointer);
198 }
199
200 static int __init msi_wmi_input_setup(void)
201 {
202         int err;
203
204         msi_wmi_input_dev = input_allocate_device();
205         if (!msi_wmi_input_dev)
206                 return -ENOMEM;
207
208         msi_wmi_input_dev->name = "MSI WMI hotkeys";
209         msi_wmi_input_dev->phys = "wmi/input0";
210         msi_wmi_input_dev->id.bustype = BUS_HOST;
211
212         err = sparse_keymap_setup(msi_wmi_input_dev, msi_wmi_keymap, NULL);
213         if (err)
214                 goto err_free_dev;
215
216         err = input_register_device(msi_wmi_input_dev);
217
218         if (err)
219                 goto err_free_keymap;
220
221         memset(last_pressed, 0, sizeof(last_pressed));
222
223         return 0;
224
225 err_free_keymap:
226         sparse_keymap_free(msi_wmi_input_dev);
227 err_free_dev:
228         input_free_device(msi_wmi_input_dev);
229         return err;
230 }
231
232 static int __init msi_wmi_init(void)
233 {
234         int err;
235
236         if (!wmi_has_guid(MSIWMI_EVENT_GUID)) {
237                 pr_err("This machine doesn't have MSI-hotkeys through WMI\n");
238                 return -ENODEV;
239         }
240         err = wmi_install_notify_handler(MSIWMI_EVENT_GUID,
241                         msi_wmi_notify, NULL);
242         if (ACPI_FAILURE(err))
243                 return -EINVAL;
244
245         err = msi_wmi_input_setup();
246         if (err)
247                 goto err_uninstall_notifier;
248
249         if (!acpi_video_backlight_support()) {
250                 struct backlight_properties props;
251                 memset(&props, 0, sizeof(struct backlight_properties));
252                 props.type = BACKLIGHT_PLATFORM;
253                 props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
254                 backlight = backlight_device_register(DRV_NAME, NULL, NULL,
255                                                       &msi_backlight_ops,
256                                                       &props);
257                 if (IS_ERR(backlight)) {
258                         err = PTR_ERR(backlight);
259                         goto err_free_input;
260                 }
261
262                 err = bl_get(NULL);
263                 if (err < 0)
264                         goto err_free_backlight;
265
266                 backlight->props.brightness = err;
267         }
268         pr_debug("Event handler installed\n");
269
270         return 0;
271
272 err_free_backlight:
273         backlight_device_unregister(backlight);
274 err_free_input:
275         sparse_keymap_free(msi_wmi_input_dev);
276         input_unregister_device(msi_wmi_input_dev);
277 err_uninstall_notifier:
278         wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
279         return err;
280 }
281
282 static void __exit msi_wmi_exit(void)
283 {
284         if (wmi_has_guid(MSIWMI_EVENT_GUID)) {
285                 wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
286                 sparse_keymap_free(msi_wmi_input_dev);
287                 input_unregister_device(msi_wmi_input_dev);
288                 backlight_device_unregister(backlight);
289         }
290 }
291
292 module_init(msi_wmi_init);
293 module_exit(msi_wmi_exit);