drivers/platform/x86/dell-laptop.c

   1 /*
   2  *  Driver for Dell laptop extras
   3  *
   4  *  Copyright (c) Red Hat <mjg@redhat.com>
   5  *
   6  *  Based on documentation in the libsmbios package, Copyright (C) 2005 Dell
   7  *  Inc.
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2 as
  11  *  published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/backlight.h>
  19 #include <linux/err.h>
  20 #include <linux/dmi.h>
  21 #include <linux/io.h>
  22 #include <linux/rfkill.h>
  23 #include <linux/power_supply.h>
  24 #include <linux/acpi.h>
  25 #include "../../firmware/dcdbas.h"
  26
  27 #define BRIGHTNESS_TOKEN 0x7d
  28
  29 /* This structure will be modified by the firmware when we enter
  30  * system management mode, hence the volatiles */
  31
  32 struct calling_interface_buffer {
  33         u16 class;
  34         u16 select;
  35         volatile u32 input[4];
  36         volatile u32 output[4];
  37 } __packed;
  38
  39 struct calling_interface_token {
  40         u16 tokenID;
  41         u16 location;
  42         union {
  43                 u16 value;
  44                 u16 stringlength;
  45         };
  46 };
  47
  48 struct calling_interface_structure {
  49         struct dmi_header header;
  50         u16 cmdIOAddress;
  51         u8 cmdIOCode;
  52         u32 supportedCmds;
  53         struct calling_interface_token tokens[];
  54 } __packed;
  55
  56 static int da_command_address;
  57 static int da_command_code;
  58 static int da_num_tokens;
  59 static struct calling_interface_token *da_tokens;
  60
  61 static struct platform_driver platform_driver = {
  62         .driver = {
  63                 .name = "dell-laptop",
  64                 .owner = THIS_MODULE,
  65         }
  66 };
  67
  68 static struct platform_device *platform_device;
  69 static struct backlight_device *dell_backlight_device;
  70 static struct rfkill *wifi_rfkill;
  71 static struct rfkill *bluetooth_rfkill;
  72 static struct rfkill *wwan_rfkill;
  73
  74 static const struct dmi_system_id __initdata dell_device_table[] = {
  75         {
  76                 .ident = "Dell laptop",
  77                 .matches = {
  78                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  79                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
  80                 },
  81         },
  82         { }
  83 };
  84
  85 static void __init parse_da_table(const struct dmi_header *dm)
  86 {
  87         /* Final token is a terminator, so we don't want to copy it */
  88         int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
  89         struct calling_interface_structure *table =
  90                 container_of(dm, struct calling_interface_structure, header);
  91
  92         /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
  93            6 bytes of entry */
  94
  95         if (dm->length < 17)
  96                 return;
  97
  98         da_command_address = table->cmdIOAddress;
  99         da_command_code = table->cmdIOCode;
 100
 101         da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
 102                              sizeof(struct calling_interface_token),
 103                              GFP_KERNEL);
 104
 105         if (!da_tokens)
 106                 return;
 107
 108         memcpy(da_tokens+da_num_tokens, table->tokens,
 109                sizeof(struct calling_interface_token) * tokens);
 110
 111         da_num_tokens += tokens;
 112 }
 113
 114 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
 115 {
 116         switch (dm->type) {
 117         case 0xd4: /* Indexed IO */
 118                 break;
 119         case 0xd5: /* Protected Area Type 1 */
 120                 break;
 121         case 0xd6: /* Protected Area Type 2 */
 122                 break;
 123         case 0xda: /* Calling interface */
 124                 parse_da_table(dm);
 125                 break;
 126         }
 127 }
 128
 129 static int find_token_location(int tokenid)
 130 {
 131         int i;
 132         for (i = 0; i < da_num_tokens; i++) {
 133                 if (da_tokens[i].tokenID == tokenid)
 134                         return da_tokens[i].location;
 135         }
 136
 137         return -1;
 138 }
 139
 140 static struct calling_interface_buffer *
 141 dell_send_request(struct calling_interface_buffer *buffer, int class,
 142                   int select)
 143 {
 144         struct smi_cmd command;
 145
 146         command.magic = SMI_CMD_MAGIC;
 147         command.command_address = da_command_address;
 148         command.command_code = da_command_code;
 149         command.ebx = virt_to_phys(buffer);
 150         command.ecx = 0x42534931;
 151
 152         buffer->class = class;
 153         buffer->select = select;
 154
 155         dcdbas_smi_request(&command);
 156
 157         return buffer;
 158 }
 159
 160 /* Derived from information in DellWirelessCtl.cpp:
 161    Class 17, select 11 is radio control. It returns an array of 32-bit values.
 162
 163    result[0]: return code
 164    result[1]:
 165      Bit 0:      Hardware switch supported
 166      Bit 1:      Wifi locator supported
 167      Bit 2:      Wifi is supported
 168      Bit 3:      Bluetooth is supported
 169      Bit 4:      WWAN is supported
 170      Bit 5:      Wireless keyboard supported
 171      Bits 6-7:   Reserved
 172      Bit 8:      Wifi is installed
 173      Bit 9:      Bluetooth is installed
 174      Bit 10:     WWAN is installed
 175      Bits 11-15: Reserved
 176      Bit 16:     Hardware switch is on
 177      Bit 17:     Wifi is blocked
 178      Bit 18:     Bluetooth is blocked
 179      Bit 19:     WWAN is blocked
 180      Bits 20-31: Reserved
 181    result[2]: NVRAM size in bytes
 182    result[3]: NVRAM format version number
 183 */
 184
 185 static int dell_rfkill_set(void *data, bool blocked)
 186 {
 187         struct calling_interface_buffer buffer;
 188         int disable = blocked ? 1 : 0;
 189         unsigned long radio = (unsigned long)data;
 190
 191         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 192         buffer.input[0] = (1 | (radio<<8) | (disable << 16));
 193         dell_send_request(&buffer, 17, 11);
 194
 195         return 0;
 196 }
 197
 198 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 199 {
 200         struct calling_interface_buffer buffer;
 201         int status;
 202         int bit = (unsigned long)data + 16;
 203
 204         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 205         dell_send_request(&buffer, 17, 11);
 206         status = buffer.output[1];
 207
 208         rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
 209         rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 210 }
 211
 212 static const struct rfkill_ops dell_rfkill_ops = {
 213         .set_block = dell_rfkill_set,
 214         .query = dell_rfkill_query,
 215 };
 216
 217 static int __init dell_setup_rfkill(void)
 218 {
 219         struct calling_interface_buffer buffer;
 220         int status;
 221         int ret;
 222
 223         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 224         dell_send_request(&buffer, 17, 11);
 225         status = buffer.output[1];
 226
 227         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 228                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 229                                            RFKILL_TYPE_WLAN,
 230                                            &dell_rfkill_ops, (void *) 1);
 231                 if (!wifi_rfkill) {
 232                         ret = -ENOMEM;
 233                         goto err_wifi;
 234                 }
 235                 ret = rfkill_register(wifi_rfkill);
 236                 if (ret)
 237                         goto err_wifi;
 238         }
 239
 240         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 241                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
 242                                                 &platform_device->dev,
 243                                                 RFKILL_TYPE_BLUETOOTH,
 244                                                 &dell_rfkill_ops, (void *) 2);
 245                 if (!bluetooth_rfkill) {
 246                         ret = -ENOMEM;
 247                         goto err_bluetooth;
 248                 }
 249                 ret = rfkill_register(bluetooth_rfkill);
 250                 if (ret)
 251                         goto err_bluetooth;
 252         }
 253
 254         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 255                 wwan_rfkill = rfkill_alloc("dell-wwan",
 256                                            &platform_device->dev,
 257                                            RFKILL_TYPE_WWAN,
 258                                            &dell_rfkill_ops, (void *) 3);
 259                 if (!wwan_rfkill) {
 260                         ret = -ENOMEM;
 261                         goto err_wwan;
 262                 }
 263                 ret = rfkill_register(wwan_rfkill);
 264                 if (ret)
 265                         goto err_wwan;
 266         }
 267
 268         return 0;
 269 err_wwan:
 270         rfkill_destroy(wwan_rfkill);
 271         if (bluetooth_rfkill)
 272                 rfkill_unregister(bluetooth_rfkill);
 273 err_bluetooth:
 274         rfkill_destroy(bluetooth_rfkill);
 275         if (wifi_rfkill)
 276                 rfkill_unregister(wifi_rfkill);
 277 err_wifi:
 278         rfkill_destroy(wifi_rfkill);
 279
 280         return ret;
 281 }
 282
 283 static void dell_cleanup_rfkill(void)
 284 {
 285         if (wifi_rfkill) {
 286                 rfkill_unregister(wifi_rfkill);
 287                 rfkill_destroy(wifi_rfkill);
 288         }
 289         if (bluetooth_rfkill) {
 290                 rfkill_unregister(bluetooth_rfkill);
 291                 rfkill_destroy(bluetooth_rfkill);
 292         }
 293         if (wwan_rfkill) {
 294                 rfkill_unregister(wwan_rfkill);
 295                 rfkill_destroy(wwan_rfkill);
 296         }
 297 }
 298
 299 static int dell_send_intensity(struct backlight_device *bd)
 300 {
 301         struct calling_interface_buffer buffer;
 302
 303         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 304         buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
 305         buffer.input[1] = bd->props.brightness;
 306
 307         if (buffer.input[0] == -1)
 308                 return -ENODEV;
 309
 310         if (power_supply_is_system_supplied() > 0)
 311                 dell_send_request(&buffer, 1, 2);
 312         else
 313                 dell_send_request(&buffer, 1, 1);
 314
 315         return 0;
 316 }
 317
 318 static int dell_get_intensity(struct backlight_device *bd)
 319 {
 320         struct calling_interface_buffer buffer;
 321
 322         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 323         buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
 324
 325         if (buffer.input[0] == -1)
 326                 return -ENODEV;
 327
 328         if (power_supply_is_system_supplied() > 0)
 329                 dell_send_request(&buffer, 0, 2);
 330         else
 331                 dell_send_request(&buffer, 0, 1);
 332
 333         return buffer.output[1];
 334 }
 335
 336 static struct backlight_ops dell_ops = {
 337         .get_brightness = dell_get_intensity,
 338         .update_status  = dell_send_intensity,
 339 };
 340
 341 static int __init dell_init(void)
 342 {
 343         struct calling_interface_buffer buffer;
 344         int max_intensity = 0;
 345         int ret;
 346
 347         if (!dmi_check_system(dell_device_table))
 348                 return -ENODEV;
 349
 350         dmi_walk(find_tokens, NULL);
 351
 352         if (!da_tokens)  {
 353                 printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
 354                 return -ENODEV;
 355         }
 356
 357         ret = platform_driver_register(&platform_driver);
 358         if (ret)
 359                 goto fail_platform_driver;
 360         platform_device = platform_device_alloc("dell-laptop", -1);
 361         if (!platform_device) {
 362                 ret = -ENOMEM;
 363                 goto fail_platform_device1;
 364         }
 365         ret = platform_device_add(platform_device);
 366         if (ret)
 367                 goto fail_platform_device2;
 368
 369         ret = dell_setup_rfkill();
 370
 371         if (ret) {
 372                 printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
 373                 goto fail_rfkill;
 374         }
 375
 376 #ifdef CONFIG_ACPI
 377         /* In the event of an ACPI backlight being available, don't
 378          * register the platform controller.
 379          */
 380         if (acpi_video_backlight_support())
 381                 return 0;
 382 #endif
 383
 384         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 385         buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
 386
 387         if (buffer.input[0] != -1) {
 388                 dell_send_request(&buffer, 0, 2);
 389                 max_intensity = buffer.output[3];
 390         }
 391
 392         if (max_intensity) {
 393                 dell_backlight_device = backlight_device_register(
 394                         "dell_backlight",
 395                         &platform_device->dev, NULL,
 396                         &dell_ops);
 397
 398                 if (IS_ERR(dell_backlight_device)) {
 399                         ret = PTR_ERR(dell_backlight_device);
 400                         dell_backlight_device = NULL;
 401                         goto fail_backlight;
 402                 }
 403
 404                 dell_backlight_device->props.max_brightness = max_intensity;
 405                 dell_backlight_device->props.brightness =
 406                         dell_get_intensity(dell_backlight_device);
 407                 backlight_update_status(dell_backlight_device);
 408         }
 409
 410         return 0;
 411
 412 fail_backlight:
 413         dell_cleanup_rfkill();
 414 fail_rfkill:
 415         platform_device_del(platform_device);
 416 fail_platform_device2:
 417         platform_device_put(platform_device);
 418 fail_platform_device1:
 419         platform_driver_unregister(&platform_driver);
 420 fail_platform_driver:
 421         kfree(da_tokens);
 422         return ret;
 423 }
 424
 425 static void __exit dell_exit(void)
 426 {
 427         backlight_device_unregister(dell_backlight_device);
 428         dell_cleanup_rfkill();
 429 }
 430
 431 module_init(dell_init);
 432 module_exit(dell_exit);
 433
 434 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
 435 MODULE_DESCRIPTION("Dell laptop driver");
 436 MODULE_LICENSE("GPL");
 437 MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");