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 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 30 MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>"); 31 MODULE_DESCRIPTION("MSI laptop WMI hotkeys driver"); 32 MODULE_LICENSE("GPL"); 33 34 MODULE_ALIAS("wmi:551A1F84-FBDD-4125-91DB-3EA8F44F1D45"); 35 MODULE_ALIAS("wmi:B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2"); 36 37 #define DRV_NAME "msi-wmi" 38 #define DRV_PFX DRV_NAME ": " 39 40 #define MSIWMI_BIOS_GUID "551A1F84-FBDD-4125-91DB-3EA8F44F1D45" 41 #define MSIWMI_EVENT_GUID "B6F3EEF2-3D2F-49DC-9DE3-85BCE18C62F2" 42 43 #define dprintk(msg...) pr_debug(DRV_PFX msg) 44 45 #define KEYCODE_BASE 0xD0 46 #define MSI_WMI_BRIGHTNESSUP KEYCODE_BASE 47 #define MSI_WMI_BRIGHTNESSDOWN (KEYCODE_BASE + 1) 48 #define MSI_WMI_VOLUMEUP (KEYCODE_BASE + 2) 49 #define MSI_WMI_VOLUMEDOWN (KEYCODE_BASE + 3) 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_END, 0} 56 }; 57 static ktime_t last_pressed[ARRAY_SIZE(msi_wmi_keymap) - 1]; 58 59 struct backlight_device *backlight; 60 61 static int backlight_map[] = { 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF }; 62 63 static struct input_dev *msi_wmi_input_dev; 64 65 static int msi_wmi_query_block(int instance, int *ret) 66 { 67 acpi_status status; 68 union acpi_object *obj; 69 70 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; 71 72 status = wmi_query_block(MSIWMI_BIOS_GUID, instance, &output); 73 74 obj = output.pointer; 75 76 if (!obj || obj->type != ACPI_TYPE_INTEGER) { 77 if (obj) { 78 printk(KERN_ERR DRV_PFX "query block returned object " 79 "type: %d - buffer length:%d\n", obj->type, 80 obj->type == ACPI_TYPE_BUFFER ? 81 obj->buffer.length : 0); 82 } 83 kfree(obj); 84 return -EINVAL; 85 } 86 *ret = obj->integer.value; 87 kfree(obj); 88 return 0; 89 } 90 91 static int msi_wmi_set_block(int instance, int value) 92 { 93 acpi_status status; 94 95 struct acpi_buffer input = { sizeof(int), &value }; 96 97 dprintk("Going to set block of instance: %d - value: %d\n", 98 instance, value); 99 100 status = wmi_set_block(MSIWMI_BIOS_GUID, instance, &input); 101 102 return ACPI_SUCCESS(status) ? 0 : 1; 103 } 104 105 static int bl_get(struct backlight_device *bd) 106 { 107 int level, err, ret; 108 109 /* Instance 1 is "get backlight", cmp with DSDT */ 110 err = msi_wmi_query_block(1, &ret); 111 if (err) { 112 printk(KERN_ERR DRV_PFX "Could not query backlight: %d\n", err); 113 return -EINVAL; 114 } 115 dprintk("Get: Query block returned: %d\n", ret); 116 for (level = 0; level < ARRAY_SIZE(backlight_map); level++) { 117 if (backlight_map[level] == ret) { 118 dprintk("Current backlight level: 0x%X - index: %d\n", 119 backlight_map[level], level); 120 break; 121 } 122 } 123 if (level == ARRAY_SIZE(backlight_map)) { 124 printk(KERN_ERR DRV_PFX "get: Invalid brightness value: 0x%X\n", 125 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 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 printk(KERN_INFO DRV_PFX "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 dprintk("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 KEYCODE_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 dprintk("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 - KEYCODE_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 dprintk("Send key: 0x%X - " 188 "Input layer keycode: %d\n", key->code, 189 key->keycode); 190 sparse_keymap_report_entry(msi_wmi_input_dev, 191 key, 1, true); 192 } 193 } else 194 printk(KERN_INFO "Unknown key pressed - %x\n", 195 eventcode); 196 } else 197 printk(KERN_INFO DRV_PFX "Unknown event received\n"); 198 kfree(response.pointer); 199 } 200 201 static int __init msi_wmi_input_setup(void) 202 { 203 int err; 204 205 msi_wmi_input_dev = input_allocate_device(); 206 if (!msi_wmi_input_dev) 207 return -ENOMEM; 208 209 msi_wmi_input_dev->name = "MSI WMI hotkeys"; 210 msi_wmi_input_dev->phys = "wmi/input0"; 211 msi_wmi_input_dev->id.bustype = BUS_HOST; 212 213 err = sparse_keymap_setup(msi_wmi_input_dev, msi_wmi_keymap, NULL); 214 if (err) 215 goto err_free_dev; 216 217 err = input_register_device(msi_wmi_input_dev); 218 219 if (err) 220 goto err_free_keymap; 221 222 memset(last_pressed, 0, sizeof(last_pressed)); 223 224 return 0; 225 226 err_free_keymap: 227 sparse_keymap_free(msi_wmi_input_dev); 228 err_free_dev: 229 input_free_device(msi_wmi_input_dev); 230 return err; 231 } 232 233 static int __init msi_wmi_init(void) 234 { 235 int err; 236 237 if (!wmi_has_guid(MSIWMI_EVENT_GUID)) { 238 printk(KERN_ERR 239 "This machine doesn't have MSI-hotkeys through WMI\n"); 240 return -ENODEV; 241 } 242 err = wmi_install_notify_handler(MSIWMI_EVENT_GUID, 243 msi_wmi_notify, NULL); 244 if (ACPI_FAILURE(err)) 245 return -EINVAL; 246 247 err = msi_wmi_input_setup(); 248 if (err) 249 goto err_uninstall_notifier; 250 251 if (!acpi_video_backlight_support()) { 252 backlight = backlight_device_register(DRV_NAME, 253 NULL, NULL, &msi_backlight_ops); 254 if (IS_ERR(backlight)) 255 goto err_free_input; 256 257 backlight->props.max_brightness = ARRAY_SIZE(backlight_map) - 1; 258 err = bl_get(NULL); 259 if (err < 0) 260 goto err_free_backlight; 261 262 backlight->props.brightness = err; 263 } 264 dprintk("Event handler installed\n"); 265 266 return 0; 267 268 err_free_backlight: 269 backlight_device_unregister(backlight); 270 err_free_input: 271 input_unregister_device(msi_wmi_input_dev); 272 err_uninstall_notifier: 273 wmi_remove_notify_handler(MSIWMI_EVENT_GUID); 274 return err; 275 } 276 277 static void __exit msi_wmi_exit(void) 278 { 279 if (wmi_has_guid(MSIWMI_EVENT_GUID)) { 280 wmi_remove_notify_handler(MSIWMI_EVENT_GUID); 281 sparse_keymap_free(msi_wmi_input_dev); 282 input_unregister_device(msi_wmi_input_dev); 283 backlight_device_unregister(backlight); 284 } 285 } 286 287 module_init(msi_wmi_init); 288 module_exit(msi_wmi_exit); 289