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); 294