drivers/platform/x86/compal-laptop.c

   1 /*-*-linux-c-*-*/
   2
   3 /*
   4   Copyright (C) 2008 Cezary Jackiewicz <cezary.jackiewicz (at) gmail.com>
   5
   6   based on MSI driver
   7
   8   Copyright (C) 2006 Lennart Poettering <mzxreary (at) 0pointer (dot) de>
   9
  10   This program is free software; you can redistribute it and/or modify
  11   it under the terms of the GNU General Public License as published by
  12   the Free Software Foundation; either version 2 of the License, or
  13   (at your option) any later version.
  14
  15   This program is distributed in the hope that it will be useful, but
  16   WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18   General Public License for more details.
  19
  20   You should have received a copy of the GNU General Public License
  21   along with this program; if not, write to the Free Software
  22   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  23   02110-1301, USA.
  24  */
  25
  26 /*
  27  * comapl-laptop.c - Compal laptop support.
  28  *
  29  * This driver exports a few files in /sys/devices/platform/compal-laptop/:
  30  *
  31  *   wlan - wlan subsystem state: contains 0 or 1 (rw)
  32  *
  33  *   bluetooth - Bluetooth subsystem state: contains 0 or 1 (rw)
  34  *
  35  *   raw - raw value taken from embedded controller register (ro)
  36  *
  37  * In addition to these platform device attributes the driver
  38  * registers itself in the Linux backlight control subsystem and is
  39  * available to userspace under /sys/class/backlight/compal-laptop/.
  40  *
  41  * This driver might work on other laptops produced by Compal. If you
  42  * want to try it you can pass force=1 as argument to the module which
  43  * will force it to load even when the DMI data doesn't identify the
  44  * laptop as FL9x.
  45  */
  46
  47 #include <linux/module.h>
  48 #include <linux/kernel.h>
  49 #include <linux/init.h>
  50 #include <linux/acpi.h>
  51 #include <linux/dmi.h>
  52 #include <linux/backlight.h>
  53 #include <linux/platform_device.h>
  54
  55 #define COMPAL_DRIVER_VERSION "0.2.6"
  56
  57 #define COMPAL_LCD_LEVEL_MAX 8
  58
  59 #define COMPAL_EC_COMMAND_WIRELESS 0xBB
  60 #define COMPAL_EC_COMMAND_LCD_LEVEL 0xB9
  61
  62 #define KILLSWITCH_MASK 0x10
  63 #define WLAN_MASK       0x01
  64 #define BT_MASK         0x02
  65
  66 static int force;
  67 module_param(force, bool, 0);
  68 MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
  69
  70 /* Hardware access */
  71
  72 static int set_lcd_level(int level)
  73 {
  74         if (level < 0 || level >= COMPAL_LCD_LEVEL_MAX)
  75                 return -EINVAL;
  76
  77         ec_write(COMPAL_EC_COMMAND_LCD_LEVEL, level);
  78
  79         return 0;
  80 }
  81
  82 static int get_lcd_level(void)
  83 {
  84         u8 result;
  85
  86         ec_read(COMPAL_EC_COMMAND_LCD_LEVEL, &result);
  87
  88         return (int) result;
  89 }
  90
  91 static int set_wlan_state(int state)
  92 {
  93         u8 result, value;
  94
  95         ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);
  96
  97         if ((result & KILLSWITCH_MASK) == 0)
  98                 return -EINVAL;
  99         else {
 100                 if (state)
 101                         value = (u8) (result | WLAN_MASK);
 102                 else
 103                         value = (u8) (result & ~WLAN_MASK);
 104                 ec_write(COMPAL_EC_COMMAND_WIRELESS, value);
 105         }
 106
 107         return 0;
 108 }
 109
 110 static int set_bluetooth_state(int state)
 111 {
 112         u8 result, value;
 113
 114         ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);
 115
 116         if ((result & KILLSWITCH_MASK) == 0)
 117                 return -EINVAL;
 118         else {
 119                 if (state)
 120                         value = (u8) (result | BT_MASK);
 121                 else
 122                         value = (u8) (result & ~BT_MASK);
 123                 ec_write(COMPAL_EC_COMMAND_WIRELESS, value);
 124         }
 125
 126         return 0;
 127 }
 128
 129 static int get_wireless_state(int *wlan, int *bluetooth)
 130 {
 131         u8 result;
 132
 133         ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);
 134
 135         if (wlan) {
 136                 if ((result & KILLSWITCH_MASK) == 0)
 137                         *wlan = 0;
 138                 else
 139                         *wlan = result & WLAN_MASK;
 140         }
 141
 142         if (bluetooth) {
 143                 if ((result & KILLSWITCH_MASK) == 0)
 144                         *bluetooth = 0;
 145                 else
 146                         *bluetooth = (result & BT_MASK) >> 1;
 147         }
 148
 149         return 0;
 150 }
 151
 152 /* Backlight device stuff */
 153
 154 static int bl_get_brightness(struct backlight_device *b)
 155 {
 156         return get_lcd_level();
 157 }
 158
 159
 160 static int bl_update_status(struct backlight_device *b)
 161 {
 162         return set_lcd_level(b->props.brightness);
 163 }
 164
 165 static struct backlight_ops compalbl_ops = {
 166         .get_brightness = bl_get_brightness,
 167         .update_status  = bl_update_status,
 168 };
 169
 170 static struct backlight_device *compalbl_device;
 171
 172 /* Platform device */
 173
 174 static ssize_t show_wlan(struct device *dev,
 175         struct device_attribute *attr, char *buf)
 176 {
 177         int ret, enabled;
 178
 179         ret = get_wireless_state(&enabled, NULL);
 180         if (ret < 0)
 181                 return ret;
 182
 183         return sprintf(buf, "%i\n", enabled);
 184 }
 185
 186 static ssize_t show_raw(struct device *dev,
 187         struct device_attribute *attr, char *buf)
 188 {
 189         u8 result;
 190
 191         ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);
 192
 193         return sprintf(buf, "%i\n", result);
 194 }
 195
 196 static ssize_t show_bluetooth(struct device *dev,
 197         struct device_attribute *attr, char *buf)
 198 {
 199         int ret, enabled;
 200
 201         ret = get_wireless_state(NULL, &enabled);
 202         if (ret < 0)
 203                 return ret;
 204
 205         return sprintf(buf, "%i\n", enabled);
 206 }
 207
 208 static ssize_t store_wlan_state(struct device *dev,
 209         struct device_attribute *attr, const char *buf, size_t count)
 210 {
 211         int state, ret;
 212
 213         if (sscanf(buf, "%i", &state) != 1 || (state < 0 || state > 1))
 214                 return -EINVAL;
 215
 216         ret = set_wlan_state(state);
 217         if (ret < 0)
 218                 return ret;
 219
 220         return count;
 221 }
 222
 223 static ssize_t store_bluetooth_state(struct device *dev,
 224         struct device_attribute *attr, const char *buf, size_t count)
 225 {
 226         int state, ret;
 227
 228         if (sscanf(buf, "%i", &state) != 1 || (state < 0 || state > 1))
 229                 return -EINVAL;
 230
 231         ret = set_bluetooth_state(state);
 232         if (ret < 0)
 233                 return ret;
 234
 235         return count;
 236 }
 237
 238 static DEVICE_ATTR(bluetooth, 0644, show_bluetooth, store_bluetooth_state);
 239 static DEVICE_ATTR(wlan, 0644, show_wlan, store_wlan_state);
 240 static DEVICE_ATTR(raw, 0444, show_raw, NULL);
 241
 242 static struct attribute *compal_attributes[] = {
 243         &dev_attr_bluetooth.attr,
 244         &dev_attr_wlan.attr,
 245         &dev_attr_raw.attr,
 246         NULL
 247 };
 248
 249 static struct attribute_group compal_attribute_group = {
 250         .attrs = compal_attributes
 251 };
 252
 253 static struct platform_driver compal_driver = {
 254         .driver = {
 255                 .name = "compal-laptop",
 256                 .owner = THIS_MODULE,
 257         }
 258 };
 259
 260 static struct platform_device *compal_device;
 261
 262 /* Initialization */
 263
 264 static int dmi_check_cb(const struct dmi_system_id *id)
 265 {
 266         printk(KERN_INFO "compal-laptop: Identified laptop model '%s'.\n",
 267                 id->ident);
 268
 269         return 0;
 270 }
 271
 272 static struct dmi_system_id __initdata compal_dmi_table[] = {
 273         {
 274                 .ident = "FL90/IFL90",
 275                 .matches = {
 276                         DMI_MATCH(DMI_BOARD_NAME, "IFL90"),
 277                         DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
 278                 },
 279                 .callback = dmi_check_cb
 280         },
 281         {
 282                 .ident = "FL90/IFL90",
 283                 .matches = {
 284                         DMI_MATCH(DMI_BOARD_NAME, "IFL90"),
 285                         DMI_MATCH(DMI_BOARD_VERSION, "REFERENCE"),
 286                 },
 287                 .callback = dmi_check_cb
 288         },
 289         {
 290                 .ident = "FL91/IFL91",
 291                 .matches = {
 292                         DMI_MATCH(DMI_BOARD_NAME, "IFL91"),
 293                         DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
 294                 },
 295                 .callback = dmi_check_cb
 296         },
 297         {
 298                 .ident = "FL92/JFL92",
 299                 .matches = {
 300                         DMI_MATCH(DMI_BOARD_NAME, "JFL92"),
 301                         DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
 302                 },
 303                 .callback = dmi_check_cb
 304         },
 305         {
 306                 .ident = "FT00/IFT00",
 307                 .matches = {
 308                         DMI_MATCH(DMI_BOARD_NAME, "IFT00"),
 309                         DMI_MATCH(DMI_BOARD_VERSION, "IFT00"),
 310                 },
 311                 .callback = dmi_check_cb
 312         },
 313         { }
 314 };
 315
 316 static int __init compal_init(void)
 317 {
 318         int ret;
 319
 320         if (acpi_disabled)
 321                 return -ENODEV;
 322
 323         if (!force && !dmi_check_system(compal_dmi_table))
 324                 return -ENODEV;
 325
 326         /* Register backlight stuff */
 327
 328         if (!acpi_video_backlight_support()) {
 329                 compalbl_device = backlight_device_register("compal-laptop", NULL, NULL,
 330                                                             &compalbl_ops);
 331                 if (IS_ERR(compalbl_device))
 332                         return PTR_ERR(compalbl_device);
 333
 334                 compalbl_device->props.max_brightness = COMPAL_LCD_LEVEL_MAX-1;
 335         }
 336
 337         ret = platform_driver_register(&compal_driver);
 338         if (ret)
 339                 goto fail_backlight;
 340
 341         /* Register platform stuff */
 342
 343         compal_device = platform_device_alloc("compal-laptop", -1);
 344         if (!compal_device) {
 345                 ret = -ENOMEM;
 346                 goto fail_platform_driver;
 347         }
 348
 349         ret = platform_device_add(compal_device);
 350         if (ret)
 351                 goto fail_platform_device1;
 352
 353         ret = sysfs_create_group(&compal_device->dev.kobj,
 354                 &compal_attribute_group);
 355         if (ret)
 356                 goto fail_platform_device2;
 357
 358         printk(KERN_INFO "compal-laptop: driver "COMPAL_DRIVER_VERSION
 359                 " successfully loaded.\n");
 360
 361         return 0;
 362
 363 fail_platform_device2:
 364
 365         platform_device_del(compal_device);
 366
 367 fail_platform_device1:
 368
 369         platform_device_put(compal_device);
 370
 371 fail_platform_driver:
 372
 373         platform_driver_unregister(&compal_driver);
 374
 375 fail_backlight:
 376
 377         backlight_device_unregister(compalbl_device);
 378
 379         return ret;
 380 }
 381
 382 static void __exit compal_cleanup(void)
 383 {
 384
 385         sysfs_remove_group(&compal_device->dev.kobj, &compal_attribute_group);
 386         platform_device_unregister(compal_device);
 387         platform_driver_unregister(&compal_driver);
 388         backlight_device_unregister(compalbl_device);
 389
 390         printk(KERN_INFO "compal-laptop: driver unloaded.\n");
 391 }
 392
 393 module_init(compal_init);
 394 module_exit(compal_cleanup);
 395
 396 MODULE_AUTHOR("Cezary Jackiewicz");
 397 MODULE_DESCRIPTION("Compal Laptop Support");
 398 MODULE_VERSION(COMPAL_DRIVER_VERSION);
 399 MODULE_LICENSE("GPL");
 400
 401 MODULE_ALIAS("dmi:*:rnIFL90:rvrIFT00:*");
 402 MODULE_ALIAS("dmi:*:rnIFL90:rvrREFERENCE:*");
 403 MODULE_ALIAS("dmi:*:rnIFL91:rvrIFT00:*");
 404 MODULE_ALIAS("dmi:*:rnJFL92:rvrIFT00:*");
 405 MODULE_ALIAS("dmi:*:rnIFT00:rvrIFT00:*");