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  * This driver exports a few files in /sys/devices/platform/msi-laptop-pf/:
  27  *
  28  *   lcd_level - Screen brightness: contains a single integer in the
  29  *   range 0..8. (rw)
  30  *
  31  *   auto_brightness - Enable automatic brightness control: contains
  32  *   either 0 or 1. If set to 1 the hardware adjusts the screen
  33  *   brightness automatically when the power cord is
  34  *   plugged/unplugged. (rw)
  35  *
  36  *   wlan - WLAN subsystem enabled: contains either 0 or 1. (ro)
  37  *
  38  *   bluetooth - Bluetooth subsystem enabled: contains either 0 or 1
  39  *   Please note that this file is constantly 0 if no Bluetooth
  40  *   hardware is available. (ro)
  41  *
  42  * In addition to these platform device attributes the driver
  43  * registers itself in the Linux backlight control subsystem and is
  44  * available to userspace under /sys/class/backlight/msi-laptop-bl/.
  45  *
  46  * This driver might work on other laptops produced by MSI. If you
  47  * want to try it you can pass force=1 as argument to the module which
  48  * will force it to load even when the DMI data doesn't identify the
  49  * laptop as MSI S270. YMMV.
  50  */
  51
  52 #include <linux/module.h>
  53 #include <linux/kernel.h>
  54 #include <linux/init.h>
  55 #include <linux/acpi.h>
  56 #include <linux/dmi.h>
  57 #include <linux/backlight.h>
  58 #include <linux/platform_device.h>
  59 #include <linux/autoconf.h>
  60
  61 #define MSI_DRIVER_VERSION "0.5"
  62
  63 #define MSI_LCD_LEVEL_MAX 9
  64
  65 #define MSI_EC_COMMAND_WIRELESS 0x10
  66 #define MSI_EC_COMMAND_LCD_LEVEL 0x11
  67
  68 static int force;
  69 module_param(force, bool, 0);
  70 MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
  71
  72 static int auto_brightness;
  73 module_param(auto_brightness, int, 0);
  74 MODULE_PARM_DESC(auto_brightness, "Enable automatic brightness control (0: disabled; 1: enabled; 2: don't touch)");
  75
  76 /* Hardware access */
  77
  78 static int set_lcd_level(int level)
  79 {
  80         u8 buf[2];
  81
  82         if (level < 0 || level >= MSI_LCD_LEVEL_MAX)
  83                 return -EINVAL;
  84
  85         buf[0] = 0x80;
  86         buf[1] = (u8) (level*31);
  87
  88         return ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, buf, sizeof(buf), NULL, 0);
  89 }
  90
  91 static int get_lcd_level(void)
  92 {
  93         u8 wdata = 0, rdata;
  94         int result;
  95
  96         result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1);
  97         if (result < 0)
  98                 return result;
  99
 100         return (int) rdata / 31;
 101 }
 102
 103 static int get_auto_brightness(void)
 104 {
 105         u8 wdata = 4, rdata;
 106         int result;
 107
 108         result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1);
 109         if (result < 0)
 110                 return result;
 111
 112         return !!(rdata & 8);
 113 }
 114
 115 static int set_auto_brightness(int enable)
 116 {
 117         u8 wdata[2], rdata;
 118         int result;
 119
 120         wdata[0] = 4;
 121
 122         result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, wdata, 1, &rdata, 1);
 123         if (result < 0)
 124                 return result;
 125
 126         wdata[0] = 0x84;
 127         wdata[1] = (rdata & 0xF7) | (enable ? 8 : 0);
 128
 129         return ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, wdata, 2, NULL, 0);
 130 }
 131
 132 static int get_wireless_state(int *wlan, int *bluetooth)
 133 {
 134         u8 wdata = 0, rdata;
 135         int result;
 136
 137         result = ec_transaction(MSI_EC_COMMAND_WIRELESS, &wdata, 1, &rdata, 1);
 138         if (result < 0)
 139                 return -1;
 140
 141         if (wlan)
 142                 *wlan = !!(rdata & 8);
 143
 144         if (bluetooth)
 145                 *bluetooth = !!(rdata & 128);
 146
 147         return 0;
 148 }
 149
 150 /* Backlight device stuff */
 151
 152 static int bl_get_brightness(struct backlight_device *b)
 153 {
 154         return get_lcd_level();
 155 }
 156
 157
 158 static int bl_update_status(struct backlight_device *b)
 159 {
 160         return set_lcd_level(b->props.brightness);
 161 }
 162
 163 static struct backlight_ops msibl_ops = {
 164         .get_brightness = bl_get_brightness,
 165         .update_status  = bl_update_status,
 166 };
 167
 168 static struct backlight_device *msibl_device;
 169
 170 /* Platform device */
 171
 172 static ssize_t show_wlan(struct device *dev,
 173         struct device_attribute *attr, char *buf)
 174 {
 175
 176         int ret, enabled;
 177
 178         ret = get_wireless_state(&enabled, NULL);
 179         if (ret < 0)
 180                 return ret;
 181
 182         return sprintf(buf, "%i\n", enabled);
 183 }
 184
 185 static ssize_t show_bluetooth(struct device *dev,
 186         struct device_attribute *attr, char *buf)
 187 {
 188
 189         int ret, enabled;
 190
 191         ret = get_wireless_state(NULL, &enabled);
 192         if (ret < 0)
 193                 return ret;
 194
 195         return sprintf(buf, "%i\n", enabled);
 196 }
 197
 198 static ssize_t show_lcd_level(struct device *dev,
 199         struct device_attribute *attr, char *buf)
 200 {
 201
 202         int ret;
 203
 204         ret = get_lcd_level();
 205         if (ret < 0)
 206                 return ret;
 207
 208         return sprintf(buf, "%i\n", ret);
 209 }
 210
 211 static ssize_t store_lcd_level(struct device *dev,
 212         struct device_attribute *attr, const char *buf, size_t count)
 213 {
 214
 215         int level, ret;
 216
 217         if (sscanf(buf, "%i", &level) != 1 || (level < 0 || level >= MSI_LCD_LEVEL_MAX))
 218                 return -EINVAL;
 219
 220         ret = set_lcd_level(level);
 221         if (ret < 0)
 222                 return ret;
 223
 224         return count;
 225 }
 226
 227 static ssize_t show_auto_brightness(struct device *dev,
 228         struct device_attribute *attr, char *buf)
 229 {
 230
 231         int ret;
 232
 233         ret = get_auto_brightness();
 234         if (ret < 0)
 235                 return ret;
 236
 237         return sprintf(buf, "%i\n", ret);
 238 }
 239
 240 static ssize_t store_auto_brightness(struct device *dev,
 241         struct device_attribute *attr, const char *buf, size_t count)
 242 {
 243
 244         int enable, ret;
 245
 246         if (sscanf(buf, "%i", &enable) != 1 || (enable != (enable & 1)))
 247                 return -EINVAL;
 248
 249         ret = set_auto_brightness(enable);
 250         if (ret < 0)
 251                 return ret;
 252
 253         return count;
 254 }
 255
 256 static DEVICE_ATTR(lcd_level, 0644, show_lcd_level, store_lcd_level);
 257 static DEVICE_ATTR(auto_brightness, 0644, show_auto_brightness, store_auto_brightness);
 258 static DEVICE_ATTR(bluetooth, 0444, show_bluetooth, NULL);
 259 static DEVICE_ATTR(wlan, 0444, show_wlan, NULL);
 260
 261 static struct attribute *msipf_attributes[] = {
 262         &dev_attr_lcd_level.attr,
 263         &dev_attr_auto_brightness.attr,
 264         &dev_attr_bluetooth.attr,
 265         &dev_attr_wlan.attr,
 266         NULL
 267 };
 268
 269 static struct attribute_group msipf_attribute_group = {
 270         .attrs = msipf_attributes
 271 };
 272
 273 static struct platform_driver msipf_driver = {
 274         .driver = {
 275                 .name = "msi-laptop-pf",
 276                 .owner = THIS_MODULE,
 277         }
 278 };
 279
 280 static struct platform_device *msipf_device;
 281
 282 /* Initialization */
 283
 284 static struct dmi_system_id __initdata msi_dmi_table[] = {
 285         {
 286                 .ident = "MSI S270",
 287                 .matches = {
 288                         DMI_MATCH(DMI_SYS_VENDOR, "MICRO-STAR INT'L CO.,LTD"),
 289                         DMI_MATCH(DMI_PRODUCT_NAME, "MS-1013"),
 290                 }
 291         },
 292         {
 293                 .ident = "Medion MD96100",
 294                 .matches = {
 295                         DMI_MATCH(DMI_SYS_VENDOR, "NOTEBOOK"),
 296                         DMI_MATCH(DMI_PRODUCT_NAME, "SAM2000"),
 297                 }
 298         },
 299         { }
 300 };
 301
 302
 303 static int __init msi_init(void)
 304 {
 305         int ret;
 306
 307         if (acpi_disabled)
 308                 return -ENODEV;
 309
 310         if (!force && !dmi_check_system(msi_dmi_table))
 311                 return -ENODEV;
 312
 313         if (auto_brightness < 0 || auto_brightness > 2)
 314                 return -EINVAL;
 315
 316         /* Register backlight stuff */
 317
 318         msibl_device = backlight_device_register("msi-laptop-bl", NULL, NULL,
 319                                                 &msibl_ops);
 320         if (IS_ERR(msibl_device))
 321                 return PTR_ERR(msibl_device);
 322
 323         msibl_device->props.max_brightness = MSI_LCD_LEVEL_MAX-1,
 324
 325         ret = platform_driver_register(&msipf_driver);
 326         if (ret)
 327                 goto fail_backlight;
 328
 329         /* Register platform stuff */
 330
 331         msipf_device = platform_device_alloc("msi-laptop-pf", -1);
 332         if (!msipf_device) {
 333                 ret = -ENOMEM;
 334                 goto fail_platform_driver;
 335         }
 336
 337         ret = platform_device_add(msipf_device);
 338         if (ret)
 339                 goto fail_platform_device1;
 340
 341         ret = sysfs_create_group(&msipf_device->dev.kobj, &msipf_attribute_group);
 342         if (ret)
 343                 goto fail_platform_device2;
 344
 345         /* Disable automatic brightness control by default because
 346          * this module was probably loaded to do brightness control in
 347          * software. */
 348
 349         if (auto_brightness != 2)
 350                 set_auto_brightness(auto_brightness);
 351
 352         printk(KERN_INFO "msi-laptop: driver "MSI_DRIVER_VERSION" successfully loaded.\n");
 353
 354         return 0;
 355
 356 fail_platform_device2:
 357
 358         platform_device_del(msipf_device);
 359
 360 fail_platform_device1:
 361
 362         platform_device_put(msipf_device);
 363
 364 fail_platform_driver:
 365
 366         platform_driver_unregister(&msipf_driver);
 367
 368 fail_backlight:
 369
 370         backlight_device_unregister(msibl_device);
 371
 372         return ret;
 373 }
 374
 375 static void __exit msi_cleanup(void)
 376 {
 377
 378         sysfs_remove_group(&msipf_device->dev.kobj, &msipf_attribute_group);
 379         platform_device_unregister(msipf_device);
 380         platform_driver_unregister(&msipf_driver);
 381         backlight_device_unregister(msibl_device);
 382
 383         /* Enable automatic brightness control again */
 384         if (auto_brightness != 2)
 385                 set_auto_brightness(1);
 386
 387         printk(KERN_INFO "msi-laptop: driver unloaded.\n");
 388 }
 389
 390 module_init(msi_init);
 391 module_exit(msi_cleanup);
 392
 393 MODULE_AUTHOR("Lennart Poettering");
 394 MODULE_DESCRIPTION("MSI Laptop Support");
 395 MODULE_VERSION(MSI_DRIVER_VERSION);
 396 MODULE_LICENSE("GPL");