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 43MODULE_AUTHOR("Yong Wang <yong.y.wang@intel.com>"); 44MODULE_DESCRIPTION("Eee PC WMI Hotkey Driver"); 45MODULE_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 50MODULE_ALIAS("wmi:"EEEPC_WMI_EVENT_GUID); 51MODULE_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 61#define EEEPC_WMI_DEVID_BACKLIGHT 0x00050012 62 63static const struct key_entry eeepc_wmi_keymap[] = { 64 /* Sleep already handled via generic ACPI code */ 65 { KE_KEY, 0x5d, { KEY_WLAN } }, 66 { KE_KEY, 0x32, { KEY_MUTE } }, 67 { KE_KEY, 0x31, { KEY_VOLUMEDOWN } }, 68 { KE_KEY, 0x30, { KEY_VOLUMEUP } }, 69 { KE_IGNORE, NOTIFY_BRNDOWN_MIN, { KEY_BRIGHTNESSDOWN } }, 70 { KE_IGNORE, NOTIFY_BRNUP_MIN, { KEY_BRIGHTNESSUP } }, 71 { KE_KEY, 0xcc, { KEY_SWITCHVIDEOMODE } }, 72 { KE_END, 0}, 73}; 74 75struct bios_args { 76 u32 dev_id; 77 u32 ctrl_param; 78}; 79 80struct eeepc_wmi { 81 struct input_dev *inputdev; 82 struct backlight_device *backlight_device; 83}; 84 85static struct platform_device *platform_device; 86 87static int eeepc_wmi_input_init(struct eeepc_wmi *eeepc) 88{ 89 int err; 90 91 eeepc->inputdev = input_allocate_device(); 92 if (!eeepc->inputdev) 93 return -ENOMEM; 94 95 eeepc->inputdev->name = "Eee PC WMI hotkeys"; 96 eeepc->inputdev->phys = EEEPC_WMI_FILE "/input0"; 97 eeepc->inputdev->id.bustype = BUS_HOST; 98 eeepc->inputdev->dev.parent = &platform_device->dev; 99 100 err = sparse_keymap_setup(eeepc->inputdev, eeepc_wmi_keymap, NULL); 101 if (err) 102 goto err_free_dev; 103 104 err = input_register_device(eeepc->inputdev); 105 if (err) 106 goto err_free_keymap; 107 108 return 0; 109 110err_free_keymap: 111 sparse_keymap_free(eeepc->inputdev); 112err_free_dev: 113 input_free_device(eeepc->inputdev); 114 return err; 115} 116 117static void eeepc_wmi_input_exit(struct eeepc_wmi *eeepc) 118{ 119 if (eeepc->inputdev) { 120 sparse_keymap_free(eeepc->inputdev); 121 input_unregister_device(eeepc->inputdev); 122 } 123 124 eeepc->inputdev = NULL; 125} 126 127static acpi_status eeepc_wmi_get_devstate(u32 dev_id, u32 *ctrl_param) 128{ 129 struct acpi_buffer input = { (acpi_size)sizeof(u32), &dev_id }; 130 struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL }; 131 union acpi_object *obj; 132 acpi_status status; 133 u32 tmp; 134 135 status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID, 136 1, EEEPC_WMI_METHODID_DSTS, &input, &output); 137 138 if (ACPI_FAILURE(status)) 139 return status; 140 141 obj = (union acpi_object *)output.pointer; 142 if (obj && obj->type == ACPI_TYPE_INTEGER) 143 tmp = (u32)obj->integer.value; 144 else 145 tmp = 0; 146 147 if (ctrl_param) 148 *ctrl_param = tmp; 149 150 kfree(obj); 151 152 return status; 153 154} 155 156static acpi_status eeepc_wmi_set_devstate(u32 dev_id, u32 ctrl_param) 157{ 158 struct bios_args args = { 159 .dev_id = dev_id, 160 .ctrl_param = ctrl_param, 161 }; 162 struct acpi_buffer input = { (acpi_size)sizeof(args), &args }; 163 acpi_status status; 164 165 status = wmi_evaluate_method(EEEPC_WMI_MGMT_GUID, 166 1, EEEPC_WMI_METHODID_DEVS, &input, NULL); 167 168 return status; 169} 170 171static int read_brightness(struct backlight_device *bd) 172{ 173 static u32 ctrl_param; 174 acpi_status status; 175 176 status = eeepc_wmi_get_devstate(EEEPC_WMI_DEVID_BACKLIGHT, &ctrl_param); 177 178 if (ACPI_FAILURE(status)) 179 return -1; 180 else 181 return ctrl_param & 0xFF; 182} 183 184static int update_bl_status(struct backlight_device *bd) 185{ 186 187 static u32 ctrl_param; 188 acpi_status status; 189 190 ctrl_param = bd->props.brightness; 191 192 status = eeepc_wmi_set_devstate(EEEPC_WMI_DEVID_BACKLIGHT, ctrl_param); 193 194 if (ACPI_FAILURE(status)) 195 return -1; 196 else 197 return 0; 198} 199 200static const struct backlight_ops eeepc_wmi_bl_ops = { 201 .get_brightness = read_brightness, 202 .update_status = update_bl_status, 203}; 204 205static int eeepc_wmi_backlight_notify(struct eeepc_wmi *eeepc, int code) 206{ 207 struct backlight_device *bd = eeepc->backlight_device; 208 int old = bd->props.brightness; 209 int new = old; 210 211 if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX) 212 new = code - NOTIFY_BRNUP_MIN + 1; 213 else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX) 214 new = code - NOTIFY_BRNDOWN_MIN; 215 216 bd->props.brightness = new; 217 backlight_update_status(bd); 218 backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY); 219 220 return old; 221} 222 223static int eeepc_wmi_backlight_init(struct eeepc_wmi *eeepc) 224{ 225 struct backlight_device *bd; 226 struct backlight_properties props; 227 228 memset(&props, 0, sizeof(struct backlight_properties)); 229 props.max_brightness = 15; 230 bd = backlight_device_register(EEEPC_WMI_FILE, 231 &platform_device->dev, eeepc, 232 &eeepc_wmi_bl_ops, &props); 233 if (IS_ERR(bd)) { 234 pr_err("Could not register backlight device\n"); 235 return PTR_ERR(bd); 236 } 237 238 eeepc->backlight_device = bd; 239 240 bd->props.brightness = read_brightness(bd); 241 bd->props.power = FB_BLANK_UNBLANK; 242 backlight_update_status(bd); 243 244 return 0; 245} 246 247static void eeepc_wmi_backlight_exit(struct eeepc_wmi *eeepc) 248{ 249 if (eeepc->backlight_device) 250 backlight_device_unregister(eeepc->backlight_device); 251 252 eeepc->backlight_device = NULL; 253} 254 255static void eeepc_wmi_notify(u32 value, void *context) 256{ 257 struct eeepc_wmi *eeepc = context; 258 struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL }; 259 union acpi_object *obj; 260 acpi_status status; 261 int code; 262 int orig_code; 263 264 status = wmi_get_event_data(value, &response); 265 if (status != AE_OK) { 266 pr_err("bad event status 0x%x\n", status); 267 return; 268 } 269 270 obj = (union acpi_object *)response.pointer; 271 272 if (obj && obj->type == ACPI_TYPE_INTEGER) { 273 code = obj->integer.value; 274 orig_code = code; 275 276 if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX) 277 code = NOTIFY_BRNUP_MIN; 278 else if (code >= NOTIFY_BRNDOWN_MIN && 279 code <= NOTIFY_BRNDOWN_MAX) 280 code = NOTIFY_BRNDOWN_MIN; 281 282 if (code == NOTIFY_BRNUP_MIN || code == NOTIFY_BRNDOWN_MIN) { 283 if (!acpi_video_backlight_support()) 284 eeepc_wmi_backlight_notify(eeepc, orig_code); 285 } 286 287 if (!sparse_keymap_report_event(eeepc->inputdev, 288 code, 1, true)) 289 pr_info("Unknown key %x pressed\n", code); 290 } 291 292 kfree(obj); 293} 294 295static int __devinit eeepc_wmi_platform_probe(struct platform_device *device) 296{ 297 struct eeepc_wmi *eeepc; 298 int err; 299 acpi_status status; 300 301 eeepc = platform_get_drvdata(device); 302 303 err = eeepc_wmi_input_init(eeepc); 304 if (err) 305 goto error_input; 306 307 if (!acpi_video_backlight_support()) { 308 err = eeepc_wmi_backlight_init(eeepc); 309 if (err) 310 goto error_backlight; 311 } else 312 pr_info("Backlight controlled by ACPI video driver\n"); 313 314 status = wmi_install_notify_handler(EEEPC_WMI_EVENT_GUID, 315 eeepc_wmi_notify, eeepc); 316 if (ACPI_FAILURE(status)) { 317 pr_err("Unable to register notify handler - %d\n", 318 status); 319 err = -ENODEV; 320 goto error_wmi; 321 } 322 323 return 0; 324 325error_wmi: 326 eeepc_wmi_backlight_exit(eeepc); 327error_backlight: 328 eeepc_wmi_input_exit(eeepc); 329error_input: 330 return err; 331} 332 333static int __devexit eeepc_wmi_platform_remove(struct platform_device *device) 334{ 335 struct eeepc_wmi *eeepc; 336 337 eeepc = platform_get_drvdata(device); 338 wmi_remove_notify_handler(EEEPC_WMI_EVENT_GUID); 339 eeepc_wmi_backlight_exit(eeepc); 340 eeepc_wmi_input_exit(eeepc); 341 342 return 0; 343} 344 345static struct platform_driver platform_driver = { 346 .driver = { 347 .name = EEEPC_WMI_FILE, 348 .owner = THIS_MODULE, 349 }, 350 .probe = eeepc_wmi_platform_probe, 351 .remove = __devexit_p(eeepc_wmi_platform_remove), 352}; 353 354static int __init eeepc_wmi_init(void) 355{ 356 struct eeepc_wmi *eeepc; 357 int err; 358 359 if (!wmi_has_guid(EEEPC_WMI_EVENT_GUID) || 360 !wmi_has_guid(EEEPC_WMI_MGMT_GUID)) { 361 pr_warning("No known WMI GUID found\n"); 362 return -ENODEV; 363 } 364 365 eeepc = kzalloc(sizeof(struct eeepc_wmi), GFP_KERNEL); 366 if (!eeepc) 367 return -ENOMEM; 368 369 platform_device = platform_device_alloc(EEEPC_WMI_FILE, -1); 370 if (!platform_device) { 371 pr_warning("Unable to allocate platform device\n"); 372 err = -ENOMEM; 373 goto fail_platform; 374 } 375 376 err = platform_device_add(platform_device); 377 if (err) { 378 pr_warning("Unable to add platform device\n"); 379 goto put_dev; 380 } 381 382 platform_set_drvdata(platform_device, eeepc); 383 384 err = platform_driver_register(&platform_driver); 385 if (err) { 386 pr_warning("Unable to register platform driver\n"); 387 goto del_dev; 388 } 389 390 return 0; 391 392del_dev: 393 platform_device_del(platform_device); 394put_dev: 395 platform_device_put(platform_device); 396fail_platform: 397 kfree(eeepc); 398 399 return err; 400} 401 402static void __exit eeepc_wmi_exit(void) 403{ 404 struct eeepc_wmi *eeepc; 405 406 eeepc = platform_get_drvdata(platform_device); 407 platform_driver_unregister(&platform_driver); 408 platform_device_unregister(platform_device); 409 kfree(eeepc); 410} 411 412module_init(eeepc_wmi_init); 413module_exit(eeepc_wmi_exit); 414