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                 .matches = {
  76                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  77                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
  78                 },
  79         },
  80         {
  81                 .ident = "Dell Computer Corporation",
  82                 .matches = {
  83                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
  84                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
  85                 },
  86         },
  87         { }
  88 };
  89
  90 static void parse_da_table(const struct dmi_header *dm)
  91 {
  92         /* Final token is a terminator, so we don't want to copy it */
  93         int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
  94         struct calling_interface_structure *table =
  95                 container_of(dm, struct calling_interface_structure, header);
  96
  97         /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
  98            6 bytes of entry */
  99
 100         if (dm->length < 17)
 101                 return;
 102
 103         da_command_address = table->cmdIOAddress;
 104         da_command_code = table->cmdIOCode;
 105
 106         da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
 107                              sizeof(struct calling_interface_token),
 108                              GFP_KERNEL);
 109
 110         if (!da_tokens)
 111                 return;
 112
 113         memcpy(da_tokens+da_num_tokens, table->tokens,
 114                sizeof(struct calling_interface_token) * tokens);
 115
 116         da_num_tokens += tokens;
 117 }
 118
 119 static void find_tokens(const struct dmi_header *dm, void *dummy)
 120 {
 121         switch (dm->type) {
 122         case 0xd4: /* Indexed IO */
 123                 break;
 124         case 0xd5: /* Protected Area Type 1 */
 125                 break;
 126         case 0xd6: /* Protected Area Type 2 */
 127                 break;
 128         case 0xda: /* Calling interface */
 129                 parse_da_table(dm);
 130                 break;
 131         }
 132 }
 133
 134 static int find_token_location(int tokenid)
 135 {
 136         int i;
 137         for (i = 0; i < da_num_tokens; i++) {
 138                 if (da_tokens[i].tokenID == tokenid)
 139                         return da_tokens[i].location;
 140         }
 141
 142         return -1;
 143 }
 144
 145 static struct calling_interface_buffer *
 146 dell_send_request(struct calling_interface_buffer *buffer, int class,
 147                   int select)
 148 {
 149         struct smi_cmd command;
 150
 151         command.magic = SMI_CMD_MAGIC;
 152         command.command_address = da_command_address;
 153         command.command_code = da_command_code;
 154         command.ebx = virt_to_phys(buffer);
 155         command.ecx = 0x42534931;
 156
 157         buffer->class = class;
 158         buffer->select = select;
 159
 160         dcdbas_smi_request(&command);
 161
 162         return buffer;
 163 }
 164
 165 /* Derived from information in DellWirelessCtl.cpp:
 166    Class 17, select 11 is radio control. It returns an array of 32-bit values.
 167
 168    result[0]: return code
 169    result[1]:
 170      Bit 0:      Hardware switch supported
 171      Bit 1:      Wifi locator supported
 172      Bit 2:      Wifi is supported
 173      Bit 3:      Bluetooth is supported
 174      Bit 4:      WWAN is supported
 175      Bit 5:      Wireless keyboard supported
 176      Bits 6-7:   Reserved
 177      Bit 8:      Wifi is installed
 178      Bit 9:      Bluetooth is installed
 179      Bit 10:     WWAN is installed
 180      Bits 11-15: Reserved
 181      Bit 16:     Hardware switch is on
 182      Bit 17:     Wifi is blocked
 183      Bit 18:     Bluetooth is blocked
 184      Bit 19:     WWAN is blocked
 185      Bits 20-31: Reserved
 186    result[2]: NVRAM size in bytes
 187    result[3]: NVRAM format version number
 188 */
 189
 190 static int dell_rfkill_set(void *data, bool blocked)
 191 {
 192         struct calling_interface_buffer buffer;
 193         int disable = blocked ? 1 : 0;
 194         unsigned long radio = (unsigned long)data;
 195
 196         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 197         buffer.input[0] = (1 | (radio<<8) | (disable << 16));
 198         dell_send_request(&buffer, 17, 11);
 199
 200         return 0;
 201 }
 202
 203 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 204 {
 205         struct calling_interface_buffer buffer;
 206         int status;
 207         int bit = (unsigned long)data + 16;
 208
 209         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 210         dell_send_request(&buffer, 17, 11);
 211         status = buffer.output[1];
 212
 213         if (status & BIT(bit))
 214                 rfkill_set_hw_state(rfkill, !!(status & BIT(16)));
 215 }
 216
 217 static const struct rfkill_ops dell_rfkill_ops = {
 218         .set_block = dell_rfkill_set,
 219         .query = dell_rfkill_query,
 220 };
 221
 222 static int dell_setup_rfkill(void)
 223 {
 224         struct calling_interface_buffer buffer;
 225         int status;
 226         int ret;
 227
 228         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 229         dell_send_request(&buffer, 17, 11);
 230         status = buffer.output[1];
 231
 232         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 233                 wifi_rfkill = rfkill_alloc("dell-wifi", NULL, RFKILL_TYPE_WLAN,
 234                                            &dell_rfkill_ops, (void *) 1);
 235                 if (!wifi_rfkill) {
 236                         ret = -ENOMEM;
 237                         goto err_wifi;
 238                 }
 239                 ret = rfkill_register(wifi_rfkill);
 240                 if (ret)
 241                         goto err_wifi;
 242         }
 243
 244         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 245                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth", NULL,
 246                                                 RFKILL_TYPE_BLUETOOTH,
 247                                                 &dell_rfkill_ops, (void *) 2);
 248                 if (!bluetooth_rfkill) {
 249                         ret = -ENOMEM;
 250                         goto err_bluetooth;
 251                 }
 252                 ret = rfkill_register(bluetooth_rfkill);
 253                 if (ret)
 254                         goto err_bluetooth;
 255         }
 256
 257         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 258                 wwan_rfkill = rfkill_alloc("dell-wwan", NULL, RFKILL_TYPE_WWAN,
 259                                            &dell_rfkill_ops, (void *) 3);
 260                 if (!wwan_rfkill) {
 261                         ret = -ENOMEM;
 262                         goto err_wwan;
 263                 }
 264                 ret = rfkill_register(wwan_rfkill);
 265                 if (ret)
 266                         goto err_wwan;
 267         }
 268
 269         return 0;
 270 err_wwan:
 271         rfkill_destroy(wwan_rfkill);
 272         if (bluetooth_rfkill)
 273                 rfkill_unregister(bluetooth_rfkill);
 274 err_bluetooth:
 275         rfkill_destroy(bluetooth_rfkill);
 276         if (wifi_rfkill)
 277                 rfkill_unregister(wifi_rfkill);
 278 err_wifi:
 279         rfkill_destroy(wifi_rfkill);
 280
 281         return ret;
 282 }
 283
 284 static int dell_send_intensity(struct backlight_device *bd)
 285 {
 286         struct calling_interface_buffer buffer;
 287
 288         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 289         buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
 290         buffer.input[1] = bd->props.brightness;
 291
 292         if (buffer.input[0] == -1)
 293                 return -ENODEV;
 294
 295         if (power_supply_is_system_supplied() > 0)
 296                 dell_send_request(&buffer, 1, 2);
 297         else
 298                 dell_send_request(&buffer, 1, 1);
 299
 300         return 0;
 301 }
 302
 303 static int dell_get_intensity(struct backlight_device *bd)
 304 {
 305         struct calling_interface_buffer buffer;
 306
 307         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 308         buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
 309
 310         if (buffer.input[0] == -1)
 311                 return -ENODEV;
 312
 313         if (power_supply_is_system_supplied() > 0)
 314                 dell_send_request(&buffer, 0, 2);
 315         else
 316                 dell_send_request(&buffer, 0, 1);
 317
 318         return buffer.output[1];
 319 }
 320
 321 static struct backlight_ops dell_ops = {
 322         .get_brightness = dell_get_intensity,
 323         .update_status  = dell_send_intensity,
 324 };
 325
 326 static int __init dell_init(void)
 327 {
 328         struct calling_interface_buffer buffer;
 329         int max_intensity = 0;
 330         int ret;
 331
 332         if (!dmi_check_system(dell_device_table))
 333                 return -ENODEV;
 334
 335         dmi_walk(find_tokens, NULL);
 336
 337         if (!da_tokens)  {
 338                 printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
 339                 return -ENODEV;
 340         }
 341
 342         ret = dell_setup_rfkill();
 343
 344         if (ret) {
 345                 printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
 346                 goto out;
 347         }
 348
 349 #ifdef CONFIG_ACPI
 350         /* In the event of an ACPI backlight being available, don't
 351          * register the platform controller.
 352          */
 353         if (acpi_video_backlight_support())
 354                 return 0;
 355 #endif
 356
 357         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 358         buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
 359
 360         if (buffer.input[0] != -1) {
 361                 dell_send_request(&buffer, 0, 2);
 362                 max_intensity = buffer.output[3];
 363         }
 364
 365         if (max_intensity) {
 366                 dell_backlight_device = backlight_device_register(
 367                         "dell_backlight",
 368                         NULL, NULL,
 369                         &dell_ops);
 370
 371                 if (IS_ERR(dell_backlight_device)) {
 372                         ret = PTR_ERR(dell_backlight_device);
 373                         dell_backlight_device = NULL;
 374                         goto out;
 375                 }
 376
 377                 dell_backlight_device->props.max_brightness = max_intensity;
 378                 dell_backlight_device->props.brightness =
 379                         dell_get_intensity(dell_backlight_device);
 380                 backlight_update_status(dell_backlight_device);
 381         }
 382
 383         return 0;
 384 out:
 385         if (wifi_rfkill)
 386                 rfkill_unregister(wifi_rfkill);
 387         if (bluetooth_rfkill)
 388                 rfkill_unregister(bluetooth_rfkill);
 389         if (wwan_rfkill)
 390                 rfkill_unregister(wwan_rfkill);
 391         kfree(da_tokens);
 392         return ret;
 393 }
 394
 395 static void __exit dell_exit(void)
 396 {
 397         backlight_device_unregister(dell_backlight_device);
 398         if (wifi_rfkill)
 399                 rfkill_unregister(wifi_rfkill);
 400         if (bluetooth_rfkill)
 401                 rfkill_unregister(bluetooth_rfkill);
 402         if (wwan_rfkill)
 403                 rfkill_unregister(wwan_rfkill);
 404 }
 405
 406 module_init(dell_init);
 407 module_exit(dell_exit);
 408
 409 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
 410 MODULE_DESCRIPTION("Dell laptop driver");
 411 MODULE_LICENSE("GPL");
 412 MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");
 413 MODULE_ALIAS("dmi:*svnDellInc.:*:ct9:*");
 414 MODULE_ALIAS("dmi:*svnDellComputerCorporation.:*:ct8:*");