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24#include <linux/kernel.h>
25#include <linux/input.h>
26#include <linux/input/sparse-keymap.h>
27#include <linux/acpi.h>
28#include <linux/backlight.h>
29#include <linux/slab.h>
30
31MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");
32MODULE_DESCRIPTION("MSI laptop WMI hotkeys driver");
33MODULE_LICENSE("GPL");
34
35MODULE_ALIAS("wmi:551A1F84-FBDD-4125-91DB-3EA8F44F1D45");
36MODULE_ALIAS("wmi:B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2");
37
38#define DRV_NAME "msi-wmi"
39#define DRV_PFX DRV_NAME ": "
40
41#define MSIWMI_BIOS_GUID "551A1F84-FBDD-4125-91DB-3EA8F44F1D45"
42#define MSIWMI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"
43
44#define dprintk(msg...) pr_debug(DRV_PFX msg)
45
46#define SCANCODE_BASE 0xD0
47#define MSI_WMI_BRIGHTNESSUP SCANCODE_BASE
48#define MSI_WMI_BRIGHTNESSDOWN (SCANCODE_BASE + 1)
49#define MSI_WMI_VOLUMEUP (SCANCODE_BASE + 2)
50#define MSI_WMI_VOLUMEDOWN (SCANCODE_BASE + 3)
51#define MSI_WMI_MUTE (SCANCODE_BASE + 4)
52static struct key_entry msi_wmi_keymap[] = {
53 { KE_KEY, MSI_WMI_BRIGHTNESSUP, {KEY_BRIGHTNESSUP} },
54 { KE_KEY, MSI_WMI_BRIGHTNESSDOWN, {KEY_BRIGHTNESSDOWN} },
55 { KE_KEY, MSI_WMI_VOLUMEUP, {KEY_VOLUMEUP} },
56 { KE_KEY, MSI_WMI_VOLUMEDOWN, {KEY_VOLUMEDOWN} },
57 { KE_KEY, MSI_WMI_MUTE, {KEY_MUTE} },
58 { KE_END, 0}
59};
60static ktime_t last_pressed[ARRAY_SIZE(msi_wmi_keymap) - 1];
61
62static struct backlight_device *backlight;
63
64static int backlight_map[] = { 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF };
65
66static struct input_dev *msi_wmi_input_dev;
67
68static int msi_wmi_query_block(int instance, int *ret)
69{
70 acpi_status status;
71 union acpi_object *obj;
72
73 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
74
75 status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output);
76
77 obj = output.pointer;
78
79 if (!obj || obj->type != ACPI_TYPE_INTEGER) {
80 if (obj) {
81 printk(KERN_ERR DRV_PFX "query block returned object "
82 "type: %d - buffer length:%d\n", obj->type,
83 obj->type == ACPI_TYPE_BUFFER ?
84 obj->buffer.length : 0);
85 }
86 kfree(obj);
87 return -EINVAL;
88 }
89 *ret = obj->integer.value;
90 kfree(obj);
91 return 0;
92}
93
94static int msi_wmi_set_block(int instance, int value)
95{
96 acpi_status status;
97
98 struct acpi_buffer input = { sizeof(int), &value };
99
100 dprintk("Going to set block of instance: %d - value: %d\n",
101 instance, value);
102
103 status = wmi_set_block(MSIWMI_BIOS_GUID, instance, &input);
104
105 return ACPI_SUCCESS(status) ? 0 : 1;
106}
107
108static int bl_get(struct backlight_device *bd)
109{
110 int level, err, ret;
111
112
113 err = msi_wmi_query_block(1, &ret);
114 if (err) {
115 printk(KERN_ERR DRV_PFX "Could not query backlight: %d\n", err);
116 return -EINVAL;
117 }
118 dprintk("Get: Query block returned: %d\n", ret);
119 for (level = 0; level < ARRAY_SIZE(backlight_map); level++) {
120 if (backlight_map[level] == ret) {
121 dprintk("Current backlight level: 0x%X - index: %d\n",
122 backlight_map[level], level);
123 break;
124 }
125 }
126 if (level == ARRAY_SIZE(backlight_map)) {
127 printk(KERN_ERR DRV_PFX "get: Invalid brightness value: 0x%X\n",
128 ret);
129 return -EINVAL;
130 }
131 return level;
132}
133
134static int bl_set_status(struct backlight_device *bd)
135{
136 int bright = bd->props.brightness;
137 if (bright >= ARRAY_SIZE(backlight_map) || bright < 0)
138 return -EINVAL;
139
140
141 return msi_wmi_set_block(0, backlight_map[bright]);
142}
143
144static const struct backlight_ops msi_backlight_ops = {
145 .get_brightness = bl_get,
146 .update_status = bl_set_status,
147};
148
149static void msi_wmi_notify(u32 value, void *context)
150{
151 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
152 static struct key_entry *key;
153 union acpi_object *obj;
154 ktime_t cur;
155 acpi_status status;
156
157 status = wmi_get_event_data(value, &response);
158 if (status != AE_OK) {
159 printk(KERN_INFO DRV_PFX "bad event status 0x%x\n", status);
160 return;
161 }
162
163 obj = (union acpi_object *)response.pointer;
164
165 if (obj && obj->type == ACPI_TYPE_INTEGER) {
166 int eventcode = obj->integer.value;
167 dprintk("Eventcode: 0x%x\n", eventcode);
168 key = sparse_keymap_entry_from_scancode(msi_wmi_input_dev,
169 eventcode);
170 if (key) {
171 ktime_t diff;
172 cur = ktime_get_real();
173 diff = ktime_sub(cur, last_pressed[key->code -
174 SCANCODE_BASE]);
175
176
177 if (ktime_to_us(diff) < 1000 * 50) {
178 dprintk("Suppressed key event 0x%X - "
179 "Last press was %lld us ago\n",
180 key->code, ktime_to_us(diff));
181 return;
182 }
183 last_pressed[key->code - SCANCODE_BASE] = cur;
184
185 if (key->type == KE_KEY &&
186
187 (!acpi_video_backlight_support() ||
188 (key->code != MSI_WMI_BRIGHTNESSUP &&
189 key->code != MSI_WMI_BRIGHTNESSDOWN))) {
190 dprintk("Send key: 0x%X - "
191 "Input layer keycode: %d\n", key->code,
192 key->keycode);
193 sparse_keymap_report_entry(msi_wmi_input_dev,
194 key, 1, true);
195 }
196 } else
197 printk(KERN_INFO "Unknown key pressed - %x\n",
198 eventcode);
199 } else
200 printk(KERN_INFO DRV_PFX "Unknown event received\n");
201 kfree(response.pointer);
202}
203
204static int __init msi_wmi_input_setup(void)
205{
206 int err;
207
208 msi_wmi_input_dev = input_allocate_device();
209 if (!msi_wmi_input_dev)
210 return -ENOMEM;
211
212 msi_wmi_input_dev->name = "MSI WMI hotkeys";
213 msi_wmi_input_dev->phys = "wmi/input0";
214 msi_wmi_input_dev->id.bustype = BUS_HOST;
215
216 err = sparse_keymap_setup(msi_wmi_input_dev, msi_wmi_keymap, NULL);
217 if (err)
218 goto err_free_dev;
219
220 err = input_register_device(msi_wmi_input_dev);
221
222 if (err)
223 goto err_free_keymap;
224
225 memset(last_pressed, 0, sizeof(last_pressed));
226
227 return 0;
228
229err_free_keymap:
230 sparse_keymap_free(msi_wmi_input_dev);
231err_free_dev:
232 input_free_device(msi_wmi_input_dev);
233 return err;
234}
235
236static int __init msi_wmi_init(void)
237{
238 int err;
239
240 if (!wmi_has_guid(MSIWMI_EVENT_GUID)) {
241 printk(KERN_ERR
242 "This machine doesn't have MSI-hotkeys through WMI\n");
243 return -ENODEV;
244 }
245 err = wmi_install_notify_handler(MSIWMI_EVENT_GUID,
246 msi_wmi_notify, NULL);
247 if (ACPI_FAILURE(err))
248 return -EINVAL;
249
250 err = msi_wmi_input_setup();
251 if (err)
252 goto err_uninstall_notifier;
253
254 if (!acpi_video_backlight_support()) {
255 struct backlight_properties props;
256 memset(&props, 0, sizeof(struct backlight_properties));
257 props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
258 backlight = backlight_device_register(DRV_NAME, NULL, NULL,
259 &msi_backlight_ops,
260 &props);
261 if (IS_ERR(backlight)) {
262 err = PTR_ERR(backlight);
263 goto err_free_input;
264 }
265
266 err = bl_get(NULL);
267 if (err < 0)
268 goto err_free_backlight;
269
270 backlight->props.brightness = err;
271 }
272 dprintk("Event handler installed\n");
273
274 return 0;
275
276err_free_backlight:
277 backlight_device_unregister(backlight);
278err_free_input:
279 input_unregister_device(msi_wmi_input_dev);
280err_uninstall_notifier:
281 wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
282 return err;
283}
284
285static void __exit msi_wmi_exit(void)
286{
287 if (wmi_has_guid(MSIWMI_EVENT_GUID)) {
288 wmi_remove_notify_handler(MSIWMI_EVENT_GUID);
289 sparse_keymap_free(msi_wmi_input_dev);
290 input_unregister_device(msi_wmi_input_dev);
291 backlight_device_unregister(backlight);
292 }
293}
294
295module_init(msi_wmi_init);
296module_exit(msi_wmi_exit);
297
