drivers/misc/msi-laptop.c

   1 /*-*-linux-c-*-*/
   2
   3 /*
   4   Copyright (C) 2006 Lennart Poettering <mzxreary (at) 0pointer (dot) de>
   5
   6   This program is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation; either version 2 of the License, or
   9   (at your option) any later version.
  10
  11   This program is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with this program; if not, write to the Free Software
  18   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19   02110-1301, USA.
  20  */
  21
  22 /*
  23  * msi-laptop.c - MSI S270 laptop support. This laptop is sold under
  24  * various brands, including "Cytron/TCM/Medion/Tchibo MD96100".
  25  *
  26  * Driver also supports S271, S420 models.
  27  *
  28  * This driver exports a few files in /sys/devices/platform/msi-laptop-pf/:
  29  *
  30  *   lcd_level - Screen brightness: contains a single integer in the
  31  *   range 0..8. (rw)
  32  *
  33  *   auto_brightness - Enable automatic brightness control: contains
  34  *   either 0 or 1. If set to 1 the hardware adjusts the screen
  35  *   brightness automatically when the power cord is
  36  *   plugged/unplugged. (rw)
  37  *
  38  *   wlan - WLAN subsystem enabled: contains either 0 or 1. (ro)
  39  *
  40  *   bluetooth - Bluetooth subsystem enabled: contains either 0 or 1
  41  *   Please note that this file is constantly 0 if no Bluetooth
  42  *   hardware is available. (ro)
  43  *
  44  * In addition to these platform device attributes the driver
  45  * registers itself in the Linux backlight control subsystem and is
  46  * available to userspace under /sys/class/backlight/msi-laptop-bl/.
  47  *
  48  * This driver might work on other laptops produced by MSI. If you
  49  * want to try it you can pass force=1 as argument to the module which
  50  * will force it to load even when the DMI data doesn't identify the
  51  * laptop as MSI S270. YMMV.
  52  */
  53
  54 #include <linux/module.h>
  55 #include <linux/kernel.h>
  56 #include <linux/init.h>
  57 #include <linux/acpi.h>
  58 #include <linux/dmi.h>
  59 #include <linux/backlight.h>
  60 #include <linux/platform_device.h>
  61
  62 #define MSI_DRIVER_VERSION "0.5"
  63
  64 #define MSI_LCD_LEVEL_MAX 9
  65
  66 #define MSI_EC_COMMAND_WIRELESS 0x10
  67 #define MSI_EC_COMMAND_LCD_LEVEL 0x11
  68
  69 static int force;
  70 module_param(force, bool, 0);
  71 MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
  72
  73 static int auto_brightness;
  74 module_param(auto_brightness, int, 0);
  75 MODULE_PARM_DESC(auto_brightness, "Enable automatic brightness control (0: disabled; 1: enabled; 2: don't touch)");
  76
  77 /* Hardware access */
  78
  79 static int set_lcd_level(int level)
  80 {
  81         u8 buf[2];
  82
  83         if (level < 0 || level >= MSI_LCD_LEVEL_MAX)
  84                 return -EINVAL;
  85
  86         buf[0] = 0x80;
  87         buf[1] = (u8) (level*31);
  88
  89         return ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, buf, sizeof(buf), NULL, 0, 1);
  90 }
  91
  92 static int get_lcd_level(void)
  93 {
  94         u8 wdata = 0, rdata;
  95         int result;
  96
  97         result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1, 1);
  98         if (result < 0)
  99                 return result;
 100
 101         return (int) rdata / 31;
 102 }
 103
 104 static int get_auto_brightness(void)
 105 {
 106         u8 wdata = 4, rdata;
 107         int result;
 108
 109         result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1, 1);
 110         if (result < 0)
 111                 return result;
 112
 113         return !!(rdata & 8);
 114 }
 115
 116 static int set_auto_brightness(int enable)
 117 {
 118         u8 wdata[2], rdata;
 119         int result;
 120
 121         wdata[0] = 4;
 122
 123         result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, wdata, 1, &rdata, 1, 1);
 124         if (result < 0)
 125                 return result;
 126
 127         wdata[0] = 0x84;
 128         wdata[1] = (rdata & 0xF7) | (enable ? 8 : 0);
 129
 130         return ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, wdata, 2, NULL, 0, 1);
 131 }
 132
 133 static int get_wireless_state(int *wlan, int *bluetooth)
 134 {
 135         u8 wdata = 0, rdata;
 136         int result;
 137
 138         result = ec_transaction(MSI_EC_COMMAND_WIRELESS, &wdata, 1, &rdata, 1, 1);
 139         if (result < 0)
 140                 return -1;
 141
 142         if (wlan)
 143                 *wlan = !!(rdata & 8);
 144
 145         if (bluetooth)
 146                 *bluetooth = !!(rdata & 128);
 147
 148         return 0;
 149 }
 150
 151 /* Backlight device stuff */
 152
 153 static int bl_get_brightness(struct backlight_device *b)
 154 {
 155         return get_lcd_level();
 156 }
 157
 158
 159 static int bl_update_status(struct backlight_device *b)
 160 {
 161         return set_lcd_level(b->props.brightness);
 162 }
 163
 164 static struct backlight_ops msibl_ops = {
 165         .get_brightness = bl_get_brightness,
 166         .update_status  = bl_update_status,
 167 };
 168
 169 static struct backlight_device *msibl_device;
 170
 171 /* Platform device */
 172
 173 static ssize_t show_wlan(struct device *dev,
 174         struct device_attribute *attr, char *buf)
 175 {
 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_bluetooth(struct device *dev,
 187         struct device_attribute *attr, char *buf)
 188 {
 189
 190         int ret, enabled;
 191
 192         ret = get_wireless_state(NULL, &enabled);
 193         if (ret < 0)
 194                 return ret;
 195
 196         return sprintf(buf, "%i\n", enabled);
 197 }
 198
 199 static ssize_t show_lcd_level(struct device *dev,
 200         struct device_attribute *attr, char *buf)
 201 {
 202
 203         int ret;
 204
 205         ret = get_lcd_level();
 206         if (ret < 0)
 207                 return ret;
 208
 209         return sprintf(buf, "%i\n", ret);
 210 }
 211
 212 static ssize_t store_lcd_level(struct device *dev,
 213         struct device_attribute *attr, const char *buf, size_t count)
 214 {
 215
 216         int level, ret;
 217
 218         if (sscanf(buf, "%i", &level) != 1 || (level < 0 || level >= MSI_LCD_LEVEL_MAX))
 219                 return -EINVAL;
 220
 221         ret = set_lcd_level(level);
 222         if (ret < 0)
 223                 return ret;
 224
 225         return count;
 226 }
 227
 228 static ssize_t show_auto_brightness(struct device *dev,
 229         struct device_attribute *attr, char *buf)
 230 {
 231
 232         int ret;
 233
 234         ret = get_auto_brightness();
 235         if (ret < 0)
 236                 return ret;
 237
 238         return sprintf(buf, "%i\n", ret);
 239 }
 240
 241 static ssize_t store_auto_brightness(struct device *dev,
 242         struct device_attribute *attr, const char *buf, size_t count)
 243 {
 244
 245         int enable, ret;
 246
 247         if (sscanf(buf, "%i", &enable) != 1 || (enable != (enable & 1)))
 248                 return -EINVAL;
 249
 250         ret = set_auto_brightness(enable);
 251         if (ret < 0)
 252                 return ret;
 253
 254         return count;
 255 }
 256
 257 static DEVICE_ATTR(lcd_level, 0644, show_lcd_level, store_lcd_level);
 258 static DEVICE_ATTR(auto_brightness, 0644, show_auto_brightness, store_auto_brightness);
 259 static DEVICE_ATTR(bluetooth, 0444, show_bluetooth, NULL);
 260 static DEVICE_ATTR(wlan, 0444, show_wlan, NULL);
 261
 262 static struct attribute *msipf_attributes[] = {
 263         &dev_attr_lcd_level.attr,
 264         &dev_attr_auto_brightness.attr,
 265         &dev_attr_bluetooth.attr,
 266         &dev_attr_wlan.attr,
 267         NULL
 268 };
 269
 270 static struct attribute_group msipf_attribute_group = {
 271         .attrs = msipf_attributes
 272 };
 273
 274 static struct platform_driver msipf_driver = {
 275         .driver = {
 276                 .name = "msi-laptop-pf",
 277                 .owner = THIS_MODULE,
 278         }
 279 };
 280
 281 static struct platform_device *msipf_device;
 282
 283 /* Initialization */
 284
 285 static int dmi_check_cb(const struct dmi_system_id *id)
 286 {
 287         printk("msi-laptop: Identified laptop model '%s'.\n", id->ident);
 288         return 0;
 289 }
 290
 291 static struct dmi_system_id __initdata msi_dmi_table[] = {
 292         {
 293                 .ident = "MSI S270",
 294                 .matches = {
 295                         DMI_MATCH(DMI_SYS_VENDOR, "MICRO-STAR INT'L CO.,LTD"),
 296                         DMI_MATCH(DMI_PRODUCT_NAME, "MS-1013"),
 297                         DMI_MATCH(DMI_PRODUCT_VERSION, "0131"),
 298                         DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR INT'L CO.,LTD")
 299                 },
 300                 .callback = dmi_check_cb
 301         },
 302         {
 303                 .ident = "MSI S271",
 304                 .matches = {
 305                         DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
 306                         DMI_MATCH(DMI_PRODUCT_NAME, "MS-1058"),
 307                         DMI_MATCH(DMI_PRODUCT_VERSION, "0581"),
 308                         DMI_MATCH(DMI_BOARD_NAME, "MS-1058")
 309                 },
 310                 .callback = dmi_check_cb
 311         },
 312         {
 313                 .ident = "MSI S420",
 314                 .matches = {
 315                         DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
 316                         DMI_MATCH(DMI_PRODUCT_NAME, "MS-1412"),
 317                         DMI_MATCH(DMI_BOARD_VENDOR, "MSI"),
 318                         DMI_MATCH(DMI_BOARD_NAME, "MS-1412")
 319                 },
 320                 .callback = dmi_check_cb
 321         },
 322         {
 323                 .ident = "Medion MD96100",
 324                 .matches = {
 325                         DMI_MATCH(DMI_SYS_VENDOR, "NOTEBOOK"),
 326                         DMI_MATCH(DMI_PRODUCT_NAME, "SAM2000"),
 327                         DMI_MATCH(DMI_PRODUCT_VERSION, "0131"),
 328                         DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR INT'L CO.,LTD")
 329                 },
 330                 .callback = dmi_check_cb
 331         },
 332         { }
 333 };
 334
 335 static int __init msi_init(void)
 336 {
 337         int ret;
 338
 339         if (acpi_disabled)
 340                 return -ENODEV;
 341
 342         if (!force && !dmi_check_system(msi_dmi_table))
 343                 return -ENODEV;
 344
 345         if (auto_brightness < 0 || auto_brightness > 2)
 346                 return -EINVAL;
 347
 348         /* Register backlight stuff */
 349
 350         if (acpi_video_backlight_support()) {
 351                 printk(KERN_INFO "MSI: Brightness ignored, must be controlled "
 352                        "by ACPI video driver\n");
 353         } else {
 354                 msibl_device = backlight_device_register("msi-laptop-bl", NULL,
 355                                                          NULL, &msibl_ops);
 356                 if (IS_ERR(msibl_device))
 357                         return PTR_ERR(msibl_device);
 358                 msibl_device->props.max_brightness = MSI_LCD_LEVEL_MAX-1;
 359         }
 360
 361         ret = platform_driver_register(&msipf_driver);
 362         if (ret)
 363                 goto fail_backlight;
 364
 365         /* Register platform stuff */
 366
 367         msipf_device = platform_device_alloc("msi-laptop-pf", -1);
 368         if (!msipf_device) {
 369                 ret = -ENOMEM;
 370                 goto fail_platform_driver;
 371         }
 372
 373         ret = platform_device_add(msipf_device);
 374         if (ret)
 375                 goto fail_platform_device1;
 376
 377         ret = sysfs_create_group(&msipf_device->dev.kobj, &msipf_attribute_group);
 378         if (ret)
 379                 goto fail_platform_device2;
 380
 381         /* Disable automatic brightness control by default because
 382          * this module was probably loaded to do brightness control in
 383          * software. */
 384
 385         if (auto_brightness != 2)
 386                 set_auto_brightness(auto_brightness);
 387
 388         printk(KERN_INFO "msi-laptop: driver "MSI_DRIVER_VERSION" successfully loaded.\n");
 389
 390         return 0;
 391
 392 fail_platform_device2:
 393
 394         platform_device_del(msipf_device);
 395
 396 fail_platform_device1:
 397
 398         platform_device_put(msipf_device);
 399
 400 fail_platform_driver:
 401
 402         platform_driver_unregister(&msipf_driver);
 403
 404 fail_backlight:
 405
 406         backlight_device_unregister(msibl_device);
 407
 408         return ret;
 409 }
 410
 411 static void __exit msi_cleanup(void)
 412 {
 413
 414         sysfs_remove_group(&msipf_device->dev.kobj, &msipf_attribute_group);
 415         platform_device_unregister(msipf_device);
 416         platform_driver_unregister(&msipf_driver);
 417         backlight_device_unregister(msibl_device);
 418
 419         /* Enable automatic brightness control again */
 420         if (auto_brightness != 2)
 421                 set_auto_brightness(1);
 422
 423         printk(KERN_INFO "msi-laptop: driver unloaded.\n");
 424 }
 425
 426 module_init(msi_init);
 427 module_exit(msi_cleanup);
 428
 429 MODULE_AUTHOR("Lennart Poettering");
 430 MODULE_DESCRIPTION("MSI Laptop Support");
 431 MODULE_VERSION(MSI_DRIVER_VERSION);
 432 MODULE_LICENSE("GPL");
 433
 434 MODULE_ALIAS("dmi:*:svnMICRO-STARINT'LCO.,LTD:pnMS-1013:pvr0131*:cvnMICRO-STARINT'LCO.,LTD:ct10:*");
 435 MODULE_ALIAS("dmi:*:svnMicro-StarInternational:pnMS-1058:pvr0581:rvnMSI:rnMS-1058:*:ct10:*");
 436 MODULE_ALIAS("dmi:*:svnMicro-StarInternational:pnMS-1412:*:rvnMSI:rnMS-1412:*:cvnMICRO-STARINT'LCO.,LTD:ct10:*");
 437 MODULE_ALIAS("dmi:*:svnNOTEBOOK:pnSAM2000:pvr0131*:cvnMICRO-STARINT'LCO.,LTD:ct10:*");