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 26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 27 28 #include <linux/kernel.h> 29 #include <linux/module.h> 30 #include <linux/init.h> 31 #include <linux/types.h> 32 #include <linux/slab.h> 33 #include <linux/input.h> 34 #include <linux/input/sparse-keymap.h> 35 #include <linux/fb.h> 36 #include <linux/backlight.h> 37 #include <linux/platform_device.h> 38 #include <acpi/acpi_bus.h> 39 #include <acpi/acpi_drivers.h> 40 41 #define EEEPC_WMI_FILE "eeepc-wmi" 42 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" 48 #define EEEPC_WMI_MGMT_GUID "97845ED0-4E6D-11DE-8A39-0800200C9A66" 49 50 MODULE_ALIAS("wmi:"EEEPC_WMI_EVENT_GUID); 51 MODULE_ALIAS("wmi:"EEEPC_WMI_MGMT_GUID); 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 58 #define EEEPC_WMI_METHODID_DEVS 0x53564544 59 #define EEEPC_WMI_METHODID_DSTS 0x53544344 60 #define EEEPC_WMI_METHODID_CFVS 0x53564643 61 62 #define EEEPC_WMI_DEVID_BACKLIGHT 0x00050012 63 64 static const struct key_entry eeepc_wmi_keymap[] = { 65 /* Sleep already handled via generic ACPI code */ 66 { KE_KEY, 0x5d, { KEY_WLAN } }, 67 { KE_KEY, 0x32, { KEY_MUTE } }, 68 { KE_KEY, 0x31, { KEY_VOLUMEDOWN } }, 69 { KE_KEY, 0x30, { KEY_VOLUMEUP } }, 70 { KE_IGNORE, NOTIFY_BRNDOWN_MIN, { KEY_BRIGHTNESSDOWN } }, 71 { KE_IGNORE, NOTIFY_BRNUP_MIN, { KEY_BRIGHTNESSUP } }, 72 { KE_KEY, 0xcc, { KEY_SWITCHVIDEOMODE } }, 73 { KE_KEY, 0x6b, { KEY_F13 } }, /* Disable Touchpad */ 74 { KE_KEY, 0xe1, { KEY_F14 } }, 75 { KE_KEY, 0xe9, { KEY_DISPLAY_OFF } }, 76 { KE_KEY, 0xe0, { KEY_PROG1 } }, 77 { KE_KEY, 0x5c, { KEY_F15 } }, 78 { KE_END, 0}, 79 }; 80 81 struct bios_args { 82 u32 dev_id; 83 u32 ctrl_param; 84 }; 85 86 struct eeepc_wmi { 87 struct input_dev *inputdev; 88 struct backlight_device *backlight_device; 89 }; 90 91 static struct platform_device *platform_device; 92 93 static int eeepc_wmi_input_init(struct eeepc_wmi *eeepc) 94 { 95 int err; 96 97 eeepc->inputdev = input_allocate_device(); 98 if (!eeepc->inputdev) 99 return -ENOMEM; 100 101 eeepc->inputdev->name = "Eee PC WMI hotkeys"; 102 eeepc->inputdev->phys = EEEPC_WMI_FILE "/input0"; 103 eeepc->inputdev->id.bustype = BUS_HOST; 104 eeepc->inputdev->dev.parent = &platform_device->dev; 105 106 err = sparse_keymap_setup(eeepc->inputdev, eeepc_wmi_keymap, NULL); 107 if (err) 108 goto err_free_dev; 109 110 err = input_register_device(eeepc->inputdev); 111 if (err) 112 goto err_free_keymap; 113 114 return 0; 115 116 err_free_keymap: 117 sparse_keymap_free(eeepc->inputdev); 118 err_free_dev: 119 input_free_device(eeepc->inputdev); 120 return err; 121 } 122 123 static void eeepc_wmi_input_exit(struct eeepc_wmi *eeepc) 124 { 125 if (eeepc->inputdev) { 126 sparse_keymap_free(eeepc->inputdev); 127 input_unregister_device(eeepc->inputdev); 128 } 129 130 eeepc->inputdev = NULL; 131 } 132 133 static acpi_status eeepc_wmi_get_devstate(u32 dev_id, u32 *ctrl_param) 134 { 135 struct acpi_buffer input = { (acpi_size)sizeof(u32), &dev_id }; 136 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; 137 union acpi_object *obj; 138 acpi_status status; 139 u32 tmp; 140 141 status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID, 142 1, EEEPC_WMI_METHODID_DSTS, &input, &output); 143 144 if (ACPI_FAILURE(status)) 145 return status; 146 147 obj = (union acpi_object *)output.pointer; 148 if (obj && obj->type == ACPI_TYPE_INTEGER) 149 tmp = (u32)obj->integer.value; 150 else 151 tmp = 0; 152 153 if (ctrl_param) 154 *ctrl_param = tmp; 155 156 kfree(obj); 157 158 return status; 159 160 } 161 162 static acpi_status eeepc_wmi_set_devstate(u32 dev_id, u32 ctrl_param) 163 { 164 struct bios_args args = { 165 .dev_id = dev_id, 166 .ctrl_param = ctrl_param, 167 }; 168 struct acpi_buffer input = { (acpi_size)sizeof(args), &args }; 169 acpi_status status; 170 171 status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID, 172 1, EEEPC_WMI_METHODID_DEVS, &input, NULL); 173 174 return status; 175 } 176 177 static int read_brightness(struct backlight_device *bd) 178 { 179 static u32 ctrl_param; 180 acpi_status status; 181 182 status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_BACKLIGHT, &ctrl_param); 183 184 if (ACPI_FAILURE(status)) 185 return -1; 186 else 187 return ctrl_param & 0xFF; 188 } 189 190 static int update_bl_status(struct backlight_device *bd) 191 { 192 193 static u32 ctrl_param; 194 acpi_status status; 195 196 ctrl_param = bd->props.brightness; 197 198 status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BACKLIGHT, ctrl_param); 199 200 if (ACPI_FAILURE(status)) 201 return -1; 202 else 203 return 0; 204 } 205 206 static const struct backlight_ops eeepc_wmi_bl_ops = { 207 .get_brightness = read_brightness, 208 .update_status = update_bl_status, 209 }; 210 211 static int eeepc_wmi_backlight_notify(struct eeepc_wmi *eeepc, int code) 212 { 213 struct backlight_device *bd = eeepc->backlight_device; 214 int old = bd->props.brightness; 215 int new = old; 216 217 if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX) 218 new = code - NOTIFY_BRNUP_MIN + 1; 219 else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX) 220 new = code - NOTIFY_BRNDOWN_MIN; 221 222 bd->props.brightness = new; 223 backlight_update_status(bd); 224 backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY); 225 226 return old; 227 } 228 229 static int eeepc_wmi_backlight_init(struct eeepc_wmi *eeepc) 230 { 231 struct backlight_device *bd; 232 struct backlight_properties props; 233 234 memset(&props, 0, sizeof(struct backlight_properties)); 235 props.max_brightness = 15; 236 bd = backlight_device_register(EEEPC_WMI_FILE, 237 &platform_device->dev, eeepc, 238 &eeepc_wmi_bl_ops, &props); 239 if (IS_ERR(bd)) { 240 pr_err("Could not register backlight device\n"); 241 return PTR_ERR(bd); 242 } 243 244 eeepc->backlight_device = bd; 245 246 bd->props.brightness = read_brightness(bd); 247 bd->props.power = FB_BLANK_UNBLANK; 248 backlight_update_status(bd); 249 250 return 0; 251 } 252 253 static void eeepc_wmi_backlight_exit(struct eeepc_wmi *eeepc) 254 { 255 if (eeepc->backlight_device) 256 backlight_device_unregister(eeepc->backlight_device); 257 258 eeepc->backlight_device = NULL; 259 } 260 261 static void eeepc_wmi_notify(u32 value, void *context) 262 { 263 struct eeepc_wmi *eeepc = context; 264 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; 265 union acpi_object *obj; 266 acpi_status status; 267 int code; 268 int orig_code; 269 270 status = wmi_get_event_data(value, &response); 271 if (status != AE_OK) { 272 pr_err("bad event status 0x%x\n", status); 273 return; 274 } 275 276 obj = (union acpi_object *)response.pointer; 277 278 if (obj && obj->type == ACPI_TYPE_INTEGER) { 279 code = obj->integer.value; 280 orig_code = code; 281 282 if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX) 283 code = NOTIFY_BRNUP_MIN; 284 else if (code >= NOTIFY_BRNDOWN_MIN && 285 code <= NOTIFY_BRNDOWN_MAX) 286 code = NOTIFY_BRNDOWN_MIN; 287 288 if (code == NOTIFY_BRNUP_MIN || code == NOTIFY_BRNDOWN_MIN) { 289 if (!acpi_video_backlight_support()) 290 eeepc_wmi_backlight_notify(eeepc, orig_code); 291 } 292 293 if (!sparse_keymap_report_event(eeepc->inputdev, 294 code, 1, true)) 295 pr_info("Unknown key %x pressed\n", code); 296 } 297 298 kfree(obj); 299 } 300 301 static ssize_t store_cpufv(struct device *dev, struct device_attribute *attr, 302 const char *buf, size_t count) 303 { 304 int value; 305 struct acpi_buffer input = { (acpi_size)sizeof(value), &value }; 306 acpi_status status; 307 308 if (!count || sscanf(buf, "%i", &value) != 1) 309 return -EINVAL; 310 if (value < 0 || value > 2) 311 return -EINVAL; 312 313 status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID, 314 1, EEEPC_WMI_METHODID_CFVS, &input, NULL); 315 316 if (ACPI_FAILURE(status)) 317 return -EIO; 318 else 319 return count; 320 } 321 322 static DEVICE_ATTR(cpufv, S_IRUGO | S_IWUSR, NULL, store_cpufv); 323 324 static void eeepc_wmi_sysfs_exit(struct platform_device *device) 325 { 326 device_remove_file(&device->dev, &dev_attr_cpufv); 327 } 328 329 static int eeepc_wmi_sysfs_init(struct platform_device *device) 330 { 331 int retval = -ENOMEM; 332 333 retval = device_create_file(&device->dev, &dev_attr_cpufv); 334 if (retval) 335 goto error_sysfs; 336 337 return 0; 338 339 error_sysfs: 340 eeepc_wmi_sysfs_exit(platform_device); 341 return retval; 342 } 343 344 static int __devinit eeepc_wmi_platform_probe(struct platform_device *device) 345 { 346 struct eeepc_wmi *eeepc; 347 int err; 348 acpi_status status; 349 350 eeepc = platform_get_drvdata(device); 351 352 err = eeepc_wmi_input_init(eeepc); 353 if (err) 354 goto error_input; 355 356 if (!acpi_video_backlight_support()) { 357 err = eeepc_wmi_backlight_init(eeepc); 358 if (err) 359 goto error_backlight; 360 } else 361 pr_info("Backlight controlled by ACPI video driver\n"); 362 363 status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID, 364 eeepc_wmi_notify, eeepc); 365 if (ACPI_FAILURE(status)) { 366 pr_err("Unable to register notify handler - %d\n", 367 status); 368 err = -ENODEV; 369 goto error_wmi; 370 } 371 372 return 0; 373 374 error_wmi: 375 eeepc_wmi_backlight_exit(eeepc); 376 error_backlight: 377 eeepc_wmi_input_exit(eeepc); 378 error_input: 379 return err; 380 } 381 382 static int __devexit eeepc_wmi_platform_remove(struct platform_device *device) 383 { 384 struct eeepc_wmi *eeepc; 385 386 eeepc = platform_get_drvdata(device); 387 wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID); 388 eeepc_wmi_backlight_exit(eeepc); 389 eeepc_wmi_input_exit(eeepc); 390 391 return 0; 392 } 393 394 static struct platform_driver platform_driver = { 395 .driver = { 396 .name = EEEPC_WMI_FILE, 397 .owner = THIS_MODULE, 398 }, 399 .probe = eeepc_wmi_platform_probe, 400 .remove = __devexit_p(eeepc_wmi_platform_remove), 401 }; 402 403 static int __init eeepc_wmi_init(void) 404 { 405 struct eeepc_wmi *eeepc; 406 int err; 407 408 if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID) || 409 !wmi_has_guid(EEEPC_WMI_MGMT_GUID)) { 410 pr_warning("No known WMI GUID found\n"); 411 return -ENODEV; 412 } 413 414 eeepc = kzalloc(sizeof(struct eeepc_wmi), GFP_KERNEL); 415 if (!eeepc) 416 return -ENOMEM; 417 418 platform_device = platform_device_alloc(EEEPC_WMI_FILE, -1); 419 if (!platform_device) { 420 pr_warning("Unable to allocate platform device\n"); 421 err = -ENOMEM; 422 goto fail_platform; 423 } 424 425 err = platform_device_add(platform_device); 426 if (err) { 427 pr_warning("Unable to add platform device\n"); 428 goto put_dev; 429 } 430 431 platform_set_drvdata(platform_device, eeepc); 432 433 err = platform_driver_register(&platform_driver); 434 if (err) { 435 pr_warning("Unable to register platform driver\n"); 436 goto del_dev; 437 } 438 439 err = eeepc_wmi_sysfs_init(platform_device); 440 if (err) 441 goto del_sysfs; 442 443 return 0; 444 445 del_sysfs: 446 eeepc_wmi_sysfs_exit(platform_device); 447 del_dev: 448 platform_device_del(platform_device); 449 put_dev: 450 platform_device_put(platform_device); 451 fail_platform: 452 kfree(eeepc); 453 454 return err; 455 } 456 457 static void __exit eeepc_wmi_exit(void) 458 { 459 struct eeepc_wmi *eeepc; 460 461 eeepc_wmi_sysfs_exit(platform_device); 462 eeepc = platform_get_drvdata(platform_device); 463 platform_driver_unregister(&platform_driver); 464 platform_device_unregister(platform_device); 465 kfree(eeepc); 466 } 467 468 module_init(eeepc_wmi_init); 469 module_exit(eeepc_wmi_exit); 470