drivers/misc/eeepc-laptop.c

   1 /*
   2  *  eepc-laptop.c - Asus Eee PC extras
   3  *
   4  *  Based on asus_acpi.c as patched for the Eee PC by Asus:
   5  *  ftp://ftp.asus.com/pub/ASUS/EeePC/701/ASUS_ACPI_071126.rar
   6  *  Based on eee.c from eeepc-linux
   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
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/types.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/backlight.h>
  25 #include <linux/fb.h>
  26 #include <acpi/acpi_drivers.h>
  27 #include <acpi/acpi_bus.h>
  28 #include <linux/uaccess.h>
  29
  30 #define EEEPC_LAPTOP_VERSION    "0.1"
  31
  32 #define EEEPC_HOTK_NAME         "Eee PC Hotkey Driver"
  33 #define EEEPC_HOTK_FILE         "eeepc"
  34 #define EEEPC_HOTK_CLASS        "hotkey"
  35 #define EEEPC_HOTK_DEVICE_NAME  "Hotkey"
  36 #define EEEPC_HOTK_HID          "ASUS010"
  37
  38 #define EEEPC_LOG       EEEPC_HOTK_FILE ": "
  39 #define EEEPC_ERR       KERN_ERR        EEEPC_LOG
  40 #define EEEPC_WARNING   KERN_WARNING    EEEPC_LOG
  41 #define EEEPC_NOTICE    KERN_NOTICE     EEEPC_LOG
  42 #define EEEPC_INFO      KERN_INFO       EEEPC_LOG
  43
  44 /*
  45  * Definitions for Asus EeePC
  46  */
  47 #define NOTIFY_WLAN_ON  0x10
  48 #define NOTIFY_BRN_MIN  0x20
  49 #define NOTIFY_BRN_MAX  0x2f
  50
  51 enum {
  52         DISABLE_ASL_WLAN = 0x0001,
  53         DISABLE_ASL_BLUETOOTH = 0x0002,
  54         DISABLE_ASL_IRDA = 0x0004,
  55         DISABLE_ASL_CAMERA = 0x0008,
  56         DISABLE_ASL_TV = 0x0010,
  57         DISABLE_ASL_GPS = 0x0020,
  58         DISABLE_ASL_DISPLAYSWITCH = 0x0040,
  59         DISABLE_ASL_MODEM = 0x0080,
  60         DISABLE_ASL_CARDREADER = 0x0100
  61 };
  62
  63 enum {
  64         CM_ASL_WLAN = 0,
  65         CM_ASL_BLUETOOTH,
  66         CM_ASL_IRDA,
  67         CM_ASL_1394,
  68         CM_ASL_CAMERA,
  69         CM_ASL_TV,
  70         CM_ASL_GPS,
  71         CM_ASL_DVDROM,
  72         CM_ASL_DISPLAYSWITCH,
  73         CM_ASL_PANELBRIGHT,
  74         CM_ASL_BIOSFLASH,
  75         CM_ASL_ACPIFLASH,
  76         CM_ASL_CPUFV,
  77         CM_ASL_CPUTEMPERATURE,
  78         CM_ASL_FANCPU,
  79         CM_ASL_FANCHASSIS,
  80         CM_ASL_USBPORT1,
  81         CM_ASL_USBPORT2,
  82         CM_ASL_USBPORT3,
  83         CM_ASL_MODEM,
  84         CM_ASL_CARDREADER,
  85         CM_ASL_LID
  86 };
  87
  88 const char *cm_getv[] = {
  89         "WLDG", NULL, NULL, NULL,
  90         "CAMG", NULL, NULL, NULL,
  91         NULL, "PBLG", NULL, NULL,
  92         "CFVG", NULL, NULL, NULL,
  93         "USBG", NULL, NULL, "MODG",
  94         "CRDG", "LIDG"
  95 };
  96
  97 const char *cm_setv[] = {
  98         "WLDS", NULL, NULL, NULL,
  99         "CAMS", NULL, NULL, NULL,
 100         "SDSP", "PBLS", "HDPS", NULL,
 101         "CFVS", NULL, NULL, NULL,
 102         "USBG", NULL, NULL, "MODS",
 103         "CRDS", NULL
 104 };
 105
 106 /*
 107  * This is the main structure, we can use it to store useful information
 108  * about the hotk device
 109  */
 110 struct eeepc_hotk {
 111         struct acpi_device *device;     /* the device we are in */
 112         acpi_handle handle;             /* the handle of the hotk device */
 113         u32 cm_supported;               /* the control methods supported
 114                                            by this BIOS */
 115         uint init_flag;                 /* Init flags */
 116         u16 event_count[128];           /* count for each event */
 117 };
 118
 119 /* The actual device the driver binds to */
 120 static struct eeepc_hotk *ehotk;
 121
 122 /* Platform device/driver */
 123 static struct platform_driver platform_driver = {
 124         .driver = {
 125                 .name = EEEPC_HOTK_FILE,
 126                 .owner = THIS_MODULE,
 127         }
 128 };
 129
 130 static struct platform_device *platform_device;
 131
 132 /*
 133  * The hotkey driver declaration
 134  */
 135 static int eeepc_hotk_add(struct acpi_device *device);
 136 static int eeepc_hotk_remove(struct acpi_device *device, int type);
 137
 138 static const struct acpi_device_id eeepc_device_ids[] = {
 139         {EEEPC_HOTK_HID, 0},
 140         {"", 0},
 141 };
 142 MODULE_DEVICE_TABLE(acpi, eeepc_device_ids);
 143
 144 static struct acpi_driver eeepc_hotk_driver = {
 145         .name = EEEPC_HOTK_NAME,
 146         .class = EEEPC_HOTK_CLASS,
 147         .ids = eeepc_device_ids,
 148         .ops = {
 149                 .add = eeepc_hotk_add,
 150                 .remove = eeepc_hotk_remove,
 151         },
 152 };
 153
 154 /* The backlight device /sys/class/backlight */
 155 static struct backlight_device *eeepc_backlight_device;
 156
 157 /*
 158  * The backlight class declaration
 159  */
 160 static int read_brightness(struct backlight_device *bd);
 161 static int update_bl_status(struct backlight_device *bd);
 162 static struct backlight_ops eeepcbl_ops = {
 163         .get_brightness = read_brightness,
 164         .update_status = update_bl_status,
 165 };
 166
 167 MODULE_AUTHOR("Corentin Chary, Eric Cooper");
 168 MODULE_DESCRIPTION(EEEPC_HOTK_NAME);
 169 MODULE_LICENSE("GPL");
 170
 171 /*
 172  * ACPI Helpers
 173  */
 174 static int write_acpi_int(acpi_handle handle, const char *method, int val,
 175                           struct acpi_buffer *output)
 176 {
 177         struct acpi_object_list params;
 178         union acpi_object in_obj;
 179         acpi_status status;
 180
 181         params.count = 1;
 182         params.pointer = &in_obj;
 183         in_obj.type = ACPI_TYPE_INTEGER;
 184         in_obj.integer.value = val;
 185
 186         status = acpi_evaluate_object(handle, (char *)method, &params, output);
 187         return (status == AE_OK ? 0 : -1);
 188 }
 189
 190 static int read_acpi_int(acpi_handle handle, const char *method, int *val)
 191 {
 192         acpi_status status;
 193         ulong result;
 194
 195         status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
 196         if (ACPI_FAILURE(status)) {
 197                 *val = -1;
 198                 return -1;
 199         } else {
 200                 *val = result;
 201                 return 0;
 202         }
 203 }
 204
 205 static int set_acpi(int cm, int value)
 206 {
 207         if (ehotk->cm_supported & (0x1 << cm)) {
 208                 const char *method = cm_setv[cm];
 209                 if (method == NULL)
 210                         return -ENODEV;
 211                 if (write_acpi_int(ehotk->handle, method, value, NULL))
 212                         printk(EEEPC_WARNING "Error writing %s\n", method);
 213         }
 214         return 0;
 215 }
 216
 217 static int get_acpi(int cm)
 218 {
 219         int value = -1;
 220         if ((ehotk->cm_supported & (0x1 << cm))) {
 221                 const char *method = cm_getv[cm];
 222                 if (method == NULL)
 223                         return -ENODEV;
 224                 if (read_acpi_int(ehotk->handle, method, &value))
 225                         printk(EEEPC_WARNING "Error reading %s\n", method);
 226         }
 227         return value;
 228 }
 229
 230 /*
 231  * Backlight
 232  */
 233 static int read_brightness(struct backlight_device *bd)
 234 {
 235         return get_acpi(CM_ASL_PANELBRIGHT);
 236 }
 237
 238 static int set_brightness(struct backlight_device *bd, int value)
 239 {
 240         value = max(0, min(15, value));
 241         return set_acpi(CM_ASL_PANELBRIGHT, value);
 242 }
 243
 244 static int update_bl_status(struct backlight_device *bd)
 245 {
 246         return set_brightness(bd, bd->props.brightness);
 247 }
 248
 249 /*
 250  * Sys helpers
 251  */
 252 static int parse_arg(const char *buf, unsigned long count, int *val)
 253 {
 254         if (!count)
 255                 return 0;
 256         if (sscanf(buf, "%i", val) != 1)
 257                 return -EINVAL;
 258         return count;
 259 }
 260
 261 static ssize_t store_sys_acpi(int cm, const char *buf, size_t count)
 262 {
 263         int rv, value;
 264
 265         rv = parse_arg(buf, count, &value);
 266         if (rv > 0)
 267                 set_acpi(cm, value);
 268         return rv;
 269 }
 270
 271 static ssize_t show_sys_acpi(int cm, char *buf)
 272 {
 273         return sprintf(buf, "%d\n", get_acpi(cm));
 274 }
 275
 276 #define EEEPC_CREATE_DEVICE_ATTR(_name, _cm)                            \
 277         static ssize_t show_##_name(struct device *dev,                 \
 278                                     struct device_attribute *attr,      \
 279                                     char *buf)                          \
 280         {                                                               \
 281                 return show_sys_acpi(_cm, buf);                         \
 282         }                                                               \
 283         static ssize_t store_##_name(struct device *dev,                \
 284                                      struct device_attribute *attr,     \
 285                                      const char *buf, size_t count)     \
 286         {                                                               \
 287                 return store_sys_acpi(_cm, buf, count);                 \
 288         }                                                               \
 289         static struct device_attribute dev_attr_##_name = {             \
 290                 .attr = {                                               \
 291                         .name = __stringify(_name),                     \
 292                         .mode = 0644 },                                 \
 293                 .show   = show_##_name,                                 \
 294                 .store  = store_##_name,                                \
 295         }
 296
 297 EEEPC_CREATE_DEVICE_ATTR(camera, CM_ASL_CAMERA);
 298 EEEPC_CREATE_DEVICE_ATTR(cardr, CM_ASL_CARDREADER);
 299 EEEPC_CREATE_DEVICE_ATTR(disp, CM_ASL_DISPLAYSWITCH);
 300 EEEPC_CREATE_DEVICE_ATTR(wlan, CM_ASL_WLAN);
 301
 302 static struct attribute *platform_attributes[] = {
 303         &dev_attr_camera.attr,
 304         &dev_attr_cardr.attr,
 305         &dev_attr_disp.attr,
 306         &dev_attr_wlan.attr,
 307         NULL
 308 };
 309
 310 static struct attribute_group platform_attribute_group = {
 311         .attrs = platform_attributes
 312 };
 313
 314 /*
 315  * Hotkey functions
 316  */
 317 static int eeepc_hotk_check(void)
 318 {
 319         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 320         int result;
 321
 322         result = acpi_bus_get_status(ehotk->device);
 323         if (result)
 324                 return result;
 325         if (ehotk->device->status.present) {
 326                 if (write_acpi_int(ehotk->handle, "INIT", ehotk->init_flag,
 327                                     &buffer)) {
 328                         printk(EEEPC_ERR "Hotkey initialization failed\n");
 329                         return -ENODEV;
 330                 } else {
 331                         printk(EEEPC_NOTICE "Hotkey init flags 0x%x\n",
 332                                ehotk->init_flag);
 333                 }
 334                 /* get control methods supported */
 335                 if (read_acpi_int(ehotk->handle, "CMSG"
 336                                    , &ehotk->cm_supported)) {
 337                         printk(EEEPC_ERR
 338                                "Get control methods supported failed\n");
 339                         return -ENODEV;
 340                 } else {
 341                         printk(EEEPC_INFO
 342                                "Get control methods supported: 0x%x\n",
 343                                ehotk->cm_supported);
 344                 }
 345         } else {
 346                 printk(EEEPC_ERR "Hotkey device not present, aborting\n");
 347                 return -EINVAL;
 348         }
 349         return 0;
 350 }
 351
 352 static void notify_wlan(u32 *event)
 353 {
 354         /* if DISABLE_ASL_WLAN is set, the notify code for fn+f2
 355            will always be 0x10 */
 356         if (ehotk->cm_supported & (0x1 << CM_ASL_WLAN)) {
 357                 const char *method = cm_getv[CM_ASL_WLAN];
 358                 int value;
 359                 if (read_acpi_int(ehotk->handle, method, &value))
 360                         printk(EEEPC_WARNING "Error reading %s\n",
 361                                method);
 362                 else if (value == 1)
 363                         *event = 0x11;
 364         }
 365 }
 366
 367 static void notify_brn(void)
 368 {
 369         struct backlight_device *bd = eeepc_backlight_device;
 370         bd->props.brightness = read_brightness(bd);
 371 }
 372
 373 static void eeepc_hotk_notify(acpi_handle handle, u32 event, void *data)
 374 {
 375         if (!ehotk)
 376                 return;
 377         if (event == NOTIFY_WLAN_ON && (DISABLE_ASL_WLAN & ehotk->init_flag))
 378                 notify_wlan(&event);
 379         if (event >= NOTIFY_BRN_MIN && event <= NOTIFY_BRN_MAX)
 380                 notify_brn();
 381         acpi_bus_generate_proc_event(ehotk->device, event,
 382                                      ehotk->event_count[event % 128]++);
 383 }
 384
 385 static int eeepc_hotk_add(struct acpi_device *device)
 386 {
 387         acpi_status status = AE_OK;
 388         int result;
 389
 390         if (!device)
 391                  return -EINVAL;
 392         printk(EEEPC_NOTICE EEEPC_HOTK_NAME "\n");
 393         ehotk = kzalloc(sizeof(struct eeepc_hotk), GFP_KERNEL);
 394         if (!ehotk)
 395                 return -ENOMEM;
 396         ehotk->init_flag = DISABLE_ASL_WLAN | DISABLE_ASL_DISPLAYSWITCH;
 397         ehotk->handle = device->handle;
 398         strcpy(acpi_device_name(device), EEEPC_HOTK_DEVICE_NAME);
 399         strcpy(acpi_device_class(device), EEEPC_HOTK_CLASS);
 400         acpi_driver_data(device) = ehotk;
 401         ehotk->device = device;
 402         result = eeepc_hotk_check();
 403         if (result)
 404                 goto end;
 405         status = acpi_install_notify_handler(ehotk->handle, ACPI_SYSTEM_NOTIFY,
 406                                              eeepc_hotk_notify, ehotk);
 407         if (ACPI_FAILURE(status))
 408                 printk(EEEPC_ERR "Error installing notify handler\n");
 409  end:
 410         if (result) {
 411                 kfree(ehotk);
 412                 ehotk = NULL;
 413         }
 414         return result;
 415 }
 416
 417 static int eeepc_hotk_remove(struct acpi_device *device, int type)
 418 {
 419         acpi_status status = 0;
 420
 421         if (!device || !acpi_driver_data(device))
 422                  return -EINVAL;
 423         status = acpi_remove_notify_handler(ehotk->handle, ACPI_SYSTEM_NOTIFY,
 424                                             eeepc_hotk_notify);
 425         if (ACPI_FAILURE(status))
 426                 printk(EEEPC_ERR "Error removing notify handler\n");
 427         kfree(ehotk);
 428         return 0;
 429 }
 430
 431 /*
 432  * exit/init
 433  */
 434 static void eeepc_backlight_exit(void)
 435 {
 436         if (eeepc_backlight_device)
 437                 backlight_device_unregister(eeepc_backlight_device);
 438         eeepc_backlight_device = NULL;
 439 }
 440
 441 static void __exit eeepc_laptop_exit(void)
 442 {
 443         eeepc_backlight_exit();
 444         acpi_bus_unregister_driver(&eeepc_hotk_driver);
 445         sysfs_remove_group(&platform_device->dev.kobj,
 446                            &platform_attribute_group);
 447         platform_device_unregister(platform_device);
 448         platform_driver_unregister(&platform_driver);
 449 }
 450
 451 static int eeepc_backlight_init(struct device *dev)
 452 {
 453         struct backlight_device *bd;
 454
 455         bd = backlight_device_register(EEEPC_HOTK_FILE, dev,
 456                                        NULL, &eeepcbl_ops);
 457         if (IS_ERR(bd)) {
 458                 printk(EEEPC_ERR
 459                        "Could not register eeepc backlight device\n");
 460                 eeepc_backlight_device = NULL;
 461                 return PTR_ERR(bd);
 462         }
 463         eeepc_backlight_device = bd;
 464         bd->props.max_brightness = 15;
 465         bd->props.brightness = read_brightness(NULL);
 466         bd->props.power = FB_BLANK_UNBLANK;
 467         backlight_update_status(bd);
 468         return 0;
 469 }
 470
 471 static int __init eeepc_laptop_init(void)
 472 {
 473         struct device *dev;
 474         int result;
 475
 476         if (acpi_disabled)
 477                 return -ENODEV;
 478         result = acpi_bus_register_driver(&eeepc_hotk_driver);
 479         if (result < 0)
 480                 return result;
 481         if (!ehotk) {
 482                 acpi_bus_unregister_driver(&eeepc_hotk_driver);
 483                 return -ENODEV;
 484         }
 485         dev = acpi_get_physical_device(ehotk->device->handle);
 486         result = eeepc_backlight_init(dev);
 487         if (result)
 488                 goto fail_backlight;
 489         /* Register platform stuff */
 490         result = platform_driver_register(&platform_driver);
 491         if (result)
 492                 goto fail_platform_driver;
 493         platform_device = platform_device_alloc(EEEPC_HOTK_FILE, -1);
 494         if (!platform_device) {
 495                 result = -ENOMEM;
 496                 goto fail_platform_device1;
 497         }
 498         result = platform_device_add(platform_device);
 499         if (result)
 500                 goto fail_platform_device2;
 501         result = sysfs_create_group(&platform_device->dev.kobj,
 502                                     &platform_attribute_group);
 503         if (result)
 504                 goto fail_sysfs;
 505         return 0;
 506 fail_sysfs:
 507         platform_device_del(platform_device);
 508 fail_platform_device2:
 509         platform_device_put(platform_device);
 510 fail_platform_device1:
 511         platform_driver_unregister(&platform_driver);
 512 fail_platform_driver:
 513         eeepc_backlight_exit();
 514 fail_backlight:
 515         return result;
 516 }
 517
 518 module_init(eeepc_laptop_init);
 519 module_exit(eeepc_laptop_exit);