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 backlight_device *dell_backlight_device;
  62 static struct rfkill *wifi_rfkill;
  63 static struct rfkill *bluetooth_rfkill;
  64 static struct rfkill *wwan_rfkill;
  65
  66 static const struct dmi_system_id __initdata dell_device_table[] = {
  67         {
  68                 .ident = "Dell laptop",
  69                 .matches = {
  70                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  71                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
  72                 },
  73         },
  74         { }
  75 };
  76
  77 static void parse_da_table(const struct dmi_header *dm)
  78 {
  79         /* Final token is a terminator, so we don't want to copy it */
  80         int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
  81         struct calling_interface_structure *table =
  82                 container_of(dm, struct calling_interface_structure, header);
  83
  84         /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
  85            6 bytes of entry */
  86
  87         if (dm->length < 17)
  88                 return;
  89
  90         da_command_address = table->cmdIOAddress;
  91         da_command_code = table->cmdIOCode;
  92
  93         da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
  94                              sizeof(struct calling_interface_token),
  95                              GFP_KERNEL);
  96
  97         if (!da_tokens)
  98                 return;
  99
 100         memcpy(da_tokens+da_num_tokens, table->tokens,
 101                sizeof(struct calling_interface_token) * tokens);
 102
 103         da_num_tokens += tokens;
 104 }
 105
 106 static void find_tokens(const struct dmi_header *dm)
 107 {
 108         switch (dm->type) {
 109         case 0xd4: /* Indexed IO */
 110                 break;
 111         case 0xd5: /* Protected Area Type 1 */
 112                 break;
 113         case 0xd6: /* Protected Area Type 2 */
 114                 break;
 115         case 0xda: /* Calling interface */
 116                 parse_da_table(dm);
 117                 break;
 118         }
 119 }
 120
 121 static int find_token_location(int tokenid)
 122 {
 123         int i;
 124         for (i = 0; i < da_num_tokens; i++) {
 125                 if (da_tokens[i].tokenID == tokenid)
 126                         return da_tokens[i].location;
 127         }
 128
 129         return -1;
 130 }
 131
 132 static struct calling_interface_buffer *
 133 dell_send_request(struct calling_interface_buffer *buffer, int class,
 134                   int select)
 135 {
 136         struct smi_cmd command;
 137
 138         command.magic = SMI_CMD_MAGIC;
 139         command.command_address = da_command_address;
 140         command.command_code = da_command_code;
 141         command.ebx = virt_to_phys(buffer);
 142         command.ecx = 0x42534931;
 143
 144         buffer->class = class;
 145         buffer->select = select;
 146
 147         dcdbas_smi_request(&command);
 148
 149         return buffer;
 150 }
 151
 152 /* Derived from information in DellWirelessCtl.cpp:
 153    Class 17, select 11 is radio control. It returns an array of 32-bit values.
 154
 155    result[0]: return code
 156    result[1]:
 157      Bit 0:      Hardware switch supported
 158      Bit 1:      Wifi locator supported
 159      Bit 2:      Wifi is supported
 160      Bit 3:      Bluetooth is supported
 161      Bit 4:      WWAN is supported
 162      Bit 5:      Wireless keyboard supported
 163      Bits 6-7:   Reserved
 164      Bit 8:      Wifi is installed
 165      Bit 9:      Bluetooth is installed
 166      Bit 10:     WWAN is installed
 167      Bits 11-15: Reserved
 168      Bit 16:     Hardware switch is on
 169      Bit 17:     Wifi is blocked
 170      Bit 18:     Bluetooth is blocked
 171      Bit 19:     WWAN is blocked
 172      Bits 20-31: Reserved
 173    result[2]: NVRAM size in bytes
 174    result[3]: NVRAM format version number
 175 */
 176
 177 static int dell_rfkill_set(int radio, enum rfkill_state state)
 178 {
 179         struct calling_interface_buffer buffer;
 180         int disable = (state == RFKILL_STATE_UNBLOCKED) ? 0 : 1;
 181
 182         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 183         buffer.input[0] = (1 | (radio<<8) | (disable << 16));
 184         dell_send_request(&buffer, 17, 11);
 185
 186         return 0;
 187 }
 188
 189 static int dell_wifi_set(void *data, enum rfkill_state state)
 190 {
 191         return dell_rfkill_set(1, state);
 192 }
 193
 194 static int dell_bluetooth_set(void *data, enum rfkill_state state)
 195 {
 196         return dell_rfkill_set(2, state);
 197 }
 198
 199 static int dell_wwan_set(void *data, enum rfkill_state state)
 200 {
 201         return dell_rfkill_set(3, state);
 202 }
 203
 204 static int dell_rfkill_get(int bit, enum rfkill_state *state)
 205 {
 206         struct calling_interface_buffer buffer;
 207         int status;
 208         int new_state = RFKILL_STATE_HARD_BLOCKED;
 209
 210         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 211         dell_send_request(&buffer, 17, 11);
 212         status = buffer.output[1];
 213
 214         if (status & (1<<16))
 215                 new_state = RFKILL_STATE_SOFT_BLOCKED;
 216
 217         if (status & (1<<bit))
 218                 *state = new_state;
 219         else
 220                 *state = RFKILL_STATE_UNBLOCKED;
 221
 222         return 0;
 223 }
 224
 225 static int dell_wifi_get(void *data, enum rfkill_state *state)
 226 {
 227         return dell_rfkill_get(17, state);
 228 }
 229
 230 static int dell_bluetooth_get(void *data, enum rfkill_state *state)
 231 {
 232         return dell_rfkill_get(18, state);
 233 }
 234
 235 static int dell_wwan_get(void *data, enum rfkill_state *state)
 236 {
 237         return dell_rfkill_get(19, state);
 238 }
 239
 240 static int dell_setup_rfkill(void)
 241 {
 242         struct calling_interface_buffer buffer;
 243         int status;
 244         int ret;
 245
 246         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 247         dell_send_request(&buffer, 17, 11);
 248         status = buffer.output[1];
 249
 250         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 251                 wifi_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_WLAN);
 252                 if (!wifi_rfkill)
 253                         goto err_wifi;
 254                 wifi_rfkill->name = "dell-wifi";
 255                 wifi_rfkill->toggle_radio = dell_wifi_set;
 256                 wifi_rfkill->get_state = dell_wifi_get;
 257                 ret = rfkill_register(wifi_rfkill);
 258                 if (ret)
 259                         goto err_wifi;
 260         }
 261
 262         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 263                 bluetooth_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_BLUETOOTH);
 264                 if (!bluetooth_rfkill)
 265                         goto err_bluetooth;
 266                 bluetooth_rfkill->name = "dell-bluetooth";
 267                 bluetooth_rfkill->toggle_radio = dell_bluetooth_set;
 268                 bluetooth_rfkill->get_state = dell_bluetooth_get;
 269                 ret = rfkill_register(bluetooth_rfkill);
 270                 if (ret)
 271                         goto err_bluetooth;
 272         }
 273
 274         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 275                 wwan_rfkill = rfkill_allocate(NULL, RFKILL_TYPE_WWAN);
 276                 if (!wwan_rfkill)
 277                         goto err_wwan;
 278                 wwan_rfkill->name = "dell-wwan";
 279                 wwan_rfkill->toggle_radio = dell_wwan_set;
 280                 wwan_rfkill->get_state = dell_wwan_get;
 281                 ret = rfkill_register(wwan_rfkill);
 282                 if (ret)
 283                         goto err_wwan;
 284         }
 285
 286         return 0;
 287 err_wwan:
 288         if (wwan_rfkill)
 289                 rfkill_free(wwan_rfkill);
 290         if (bluetooth_rfkill) {
 291                 rfkill_unregister(bluetooth_rfkill);
 292                 bluetooth_rfkill = NULL;
 293         }
 294 err_bluetooth:
 295         if (bluetooth_rfkill)
 296                 rfkill_free(bluetooth_rfkill);
 297         if (wifi_rfkill) {
 298                 rfkill_unregister(wifi_rfkill);
 299                 wifi_rfkill = NULL;
 300         }
 301 err_wifi:
 302         if (wifi_rfkill)
 303                 rfkill_free(wifi_rfkill);
 304
 305         return ret;
 306 }
 307
 308 static int dell_send_intensity(struct backlight_device *bd)
 309 {
 310         struct calling_interface_buffer buffer;
 311
 312         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 313         buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
 314         buffer.input[1] = bd->props.brightness;
 315
 316         if (buffer.input[0] == -1)
 317                 return -ENODEV;
 318
 319         if (power_supply_is_system_supplied() > 0)
 320                 dell_send_request(&buffer, 1, 2);
 321         else
 322                 dell_send_request(&buffer, 1, 1);
 323
 324         return 0;
 325 }
 326
 327 static int dell_get_intensity(struct backlight_device *bd)
 328 {
 329         struct calling_interface_buffer buffer;
 330
 331         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 332         buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
 333
 334         if (buffer.input[0] == -1)
 335                 return -ENODEV;
 336
 337         if (power_supply_is_system_supplied() > 0)
 338                 dell_send_request(&buffer, 0, 2);
 339         else
 340                 dell_send_request(&buffer, 0, 1);
 341
 342         return buffer.output[1];
 343 }
 344
 345 static struct backlight_ops dell_ops = {
 346         .get_brightness = dell_get_intensity,
 347         .update_status  = dell_send_intensity,
 348 };
 349
 350 static int __init dell_init(void)
 351 {
 352         struct calling_interface_buffer buffer;
 353         int max_intensity = 0;
 354         int ret;
 355
 356         if (!dmi_check_system(dell_device_table))
 357                 return -ENODEV;
 358
 359         dmi_walk(find_tokens);
 360
 361         if (!da_tokens)  {
 362                 printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
 363                 return -ENODEV;
 364         }
 365
 366         ret = dell_setup_rfkill();
 367
 368         if (ret) {
 369                 printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
 370                 goto out;
 371         }
 372
 373 #ifdef CONFIG_ACPI
 374         /* In the event of an ACPI backlight being available, don't
 375          * register the platform controller.
 376          */
 377         if (acpi_video_backlight_support())
 378                 return 0;
 379 #endif
 380
 381         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 382         buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
 383
 384         if (buffer.input[0] != -1) {
 385                 dell_send_request(&buffer, 0, 2);
 386                 max_intensity = buffer.output[3];
 387         }
 388
 389         if (max_intensity) {
 390                 dell_backlight_device = backlight_device_register(
 391                         "dell_backlight",
 392                         NULL, NULL,
 393                         &dell_ops);
 394
 395                 if (IS_ERR(dell_backlight_device)) {
 396                         ret = PTR_ERR(dell_backlight_device);
 397                         dell_backlight_device = NULL;
 398                         goto out;
 399                 }
 400
 401                 dell_backlight_device->props.max_brightness = max_intensity;
 402                 dell_backlight_device->props.brightness =
 403                         dell_get_intensity(dell_backlight_device);
 404                 backlight_update_status(dell_backlight_device);
 405         }
 406
 407         return 0;
 408 out:
 409         if (wifi_rfkill)
 410                 rfkill_unregister(wifi_rfkill);
 411         if (bluetooth_rfkill)
 412                 rfkill_unregister(bluetooth_rfkill);
 413         if (wwan_rfkill)
 414                 rfkill_unregister(wwan_rfkill);
 415         kfree(da_tokens);
 416         return ret;
 417 }
 418
 419 static void __exit dell_exit(void)
 420 {
 421         backlight_device_unregister(dell_backlight_device);
 422         if (wifi_rfkill)
 423                 rfkill_unregister(wifi_rfkill);
 424         if (bluetooth_rfkill)
 425                 rfkill_unregister(bluetooth_rfkill);
 426         if (wwan_rfkill)
 427                 rfkill_unregister(wwan_rfkill);
 428 }
 429
 430 module_init(dell_init);
 431 module_exit(dell_exit);
 432
 433 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
 434 MODULE_DESCRIPTION("Dell laptop driver");
 435 MODULE_LICENSE("GPL");
 436 MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");