linux/drivers/misc/msi-laptop.c
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   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
  69static int force;
  70module_param(force, bool, 0);
  71MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
  72
  73static int auto_brightness;
  74module_param(auto_brightness, int, 0);
  75MODULE_PARM_DESC(auto_brightness, "Enable automatic brightness control (0: disabled; 1: enabled; 2: don't touch)");
  76
  77/* Hardware access */
  78
  79static 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
  92static 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
 104static 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
 116static 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
 133static 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
 153static int bl_get_brightness(struct backlight_device *b)
 154{
 155        return get_lcd_level();
 156}
 157
 158
 159static int bl_update_status(struct backlight_device *b)
 160{
 161        return set_lcd_level(b->props.brightness);
 162}
 163
 164static struct backlight_ops msibl_ops = {
 165        .get_brightness = bl_get_brightness,
 166        .update_status  = bl_update_status,
 167};
 168
 169static struct backlight_device *msibl_device;
 170
 171/* Platform device */
 172
 173static 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
 186static 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
 199static 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
 212static 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
 228static 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
 241static 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
 257static DEVICE_ATTR(lcd_level, 0644, show_lcd_level, store_lcd_level);
 258static DEVICE_ATTR(auto_brightness, 0644, show_auto_brightness, store_auto_brightness);
 259static DEVICE_ATTR(bluetooth, 0444, show_bluetooth, NULL);
 260static DEVICE_ATTR(wlan, 0444, show_wlan, NULL);
 261
 262static 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
 270static struct attribute_group msipf_attribute_group = {
 271        .attrs = msipf_attributes
 272};
 273
 274static struct platform_driver msipf_driver = {
 275        .driver = {
 276                .name = "msi-laptop-pf",
 277                .owner = THIS_MODULE,
 278        }
 279};
 280
 281static struct platform_device *msipf_device;
 282
 283/* Initialization */
 284
 285static 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
 291static 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
 335static 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
 392fail_platform_device2:
 393
 394        platform_device_del(msipf_device);
 395
 396fail_platform_device1:
 397
 398        platform_device_put(msipf_device);
 399
 400fail_platform_driver:
 401
 402        platform_driver_unregister(&msipf_driver);
 403
 404fail_backlight:
 405
 406        backlight_device_unregister(msibl_device);
 407
 408        return ret;
 409}
 410
 411static 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
 426module_init(msi_init);
 427module_exit(msi_cleanup);
 428
 429MODULE_AUTHOR("Lennart Poettering");
 430MODULE_DESCRIPTION("MSI Laptop Support");
 431MODULE_VERSION(MSI_DRIVER_VERSION);
 432MODULE_LICENSE("GPL");
 433
 434MODULE_ALIAS("dmi:*:svnMICRO-STARINT'LCO.,LTD:pnMS-1013:pvr0131*:cvnMICRO-STARINT'LCO.,LTD:ct10:*");
 435MODULE_ALIAS("dmi:*:svnMicro-StarInternational:pnMS-1058:pvr0581:rvnMSI:rnMS-1058:*:ct10:*");
 436MODULE_ALIAS("dmi:*:svnMicro-StarInternational:pnMS-1412:*:rvnMSI:rnMS-1412:*:cvnMICRO-STARINT'LCO.,LTD:ct10:*");
 437MODULE_ALIAS("dmi:*:svnNOTEBOOK:pnSAM2000:pvr0131*:cvnMICRO-STARINT'LCO.,LTD:ct10:*");
 438