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, void *dummy)
 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(void *data, bool blocked)
 178 {
 179         struct calling_interface_buffer buffer;
 180         int disable = blocked ? 1 : 0;
 181         unsigned long radio = (unsigned long)data;
 182
 183         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 184         buffer.input[0] = (1 | (radio<<8) | (disable << 16));
 185         dell_send_request(&buffer, 17, 11);
 186
 187         return 0;
 188 }
 189
 190 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 191 {
 192         struct calling_interface_buffer buffer;
 193         int status;
 194         int bit = (unsigned long)data + 16;
 195
 196         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 197         dell_send_request(&buffer, 17, 11);
 198         status = buffer.output[1];
 199
 200         if (status & BIT(bit))
 201                 rfkill_set_hw_state(rfkill, !!(status & BIT(16)));
 202 }
 203
 204 static const struct rfkill_ops dell_rfkill_ops = {
 205         .set_block = dell_rfkill_set,
 206         .query = dell_rfkill_query,
 207 };
 208
 209 static int dell_setup_rfkill(void)
 210 {
 211         struct calling_interface_buffer buffer;
 212         int status;
 213         int ret;
 214
 215         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 216         dell_send_request(&buffer, 17, 11);
 217         status = buffer.output[1];
 218
 219         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 220                 wifi_rfkill = rfkill_alloc("dell-wifi", NULL, RFKILL_TYPE_WLAN,
 221                                            &dell_rfkill_ops, (void *) 1);
 222                 if (!wifi_rfkill) {
 223                         ret = -ENOMEM;
 224                         goto err_wifi;
 225                 }
 226                 ret = rfkill_register(wifi_rfkill);
 227                 if (ret)
 228                         goto err_wifi;
 229         }
 230
 231         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
 232                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth", NULL,
 233                                                 RFKILL_TYPE_BLUETOOTH,
 234                                                 &dell_rfkill_ops, (void *) 2);
 235                 if (!bluetooth_rfkill) {
 236                         ret = -ENOMEM;
 237                         goto err_bluetooth;
 238                 }
 239                 ret = rfkill_register(bluetooth_rfkill);
 240                 if (ret)
 241                         goto err_bluetooth;
 242         }
 243
 244         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
 245                 wwan_rfkill = rfkill_alloc("dell-wwan", NULL, RFKILL_TYPE_WWAN,
 246                                            &dell_rfkill_ops, (void *) 3);
 247                 if (!wwan_rfkill) {
 248                         ret = -ENOMEM;
 249                         goto err_wwan;
 250                 }
 251                 ret = rfkill_register(wwan_rfkill);
 252                 if (ret)
 253                         goto err_wwan;
 254         }
 255
 256         return 0;
 257 err_wwan:
 258         rfkill_destroy(wwan_rfkill);
 259         if (bluetooth_rfkill)
 260                 rfkill_unregister(bluetooth_rfkill);
 261 err_bluetooth:
 262         rfkill_destroy(bluetooth_rfkill);
 263         if (wifi_rfkill)
 264                 rfkill_unregister(wifi_rfkill);
 265 err_wifi:
 266         rfkill_destroy(wifi_rfkill);
 267
 268         return ret;
 269 }
 270
 271 static int dell_send_intensity(struct backlight_device *bd)
 272 {
 273         struct calling_interface_buffer buffer;
 274
 275         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 276         buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
 277         buffer.input[1] = bd->props.brightness;
 278
 279         if (buffer.input[0] == -1)
 280                 return -ENODEV;
 281
 282         if (power_supply_is_system_supplied() > 0)
 283                 dell_send_request(&buffer, 1, 2);
 284         else
 285                 dell_send_request(&buffer, 1, 1);
 286
 287         return 0;
 288 }
 289
 290 static int dell_get_intensity(struct backlight_device *bd)
 291 {
 292         struct calling_interface_buffer buffer;
 293
 294         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 295         buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
 296
 297         if (buffer.input[0] == -1)
 298                 return -ENODEV;
 299
 300         if (power_supply_is_system_supplied() > 0)
 301                 dell_send_request(&buffer, 0, 2);
 302         else
 303                 dell_send_request(&buffer, 0, 1);
 304
 305         return buffer.output[1];
 306 }
 307
 308 static struct backlight_ops dell_ops = {
 309         .get_brightness = dell_get_intensity,
 310         .update_status  = dell_send_intensity,
 311 };
 312
 313 static int __init dell_init(void)
 314 {
 315         struct calling_interface_buffer buffer;
 316         int max_intensity = 0;
 317         int ret;
 318
 319         if (!dmi_check_system(dell_device_table))
 320                 return -ENODEV;
 321
 322         dmi_walk(find_tokens, NULL);
 323
 324         if (!da_tokens)  {
 325                 printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
 326                 return -ENODEV;
 327         }
 328
 329         ret = dell_setup_rfkill();
 330
 331         if (ret) {
 332                 printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
 333                 goto out;
 334         }
 335
 336 #ifdef CONFIG_ACPI
 337         /* In the event of an ACPI backlight being available, don't
 338          * register the platform controller.
 339          */
 340         if (acpi_video_backlight_support())
 341                 return 0;
 342 #endif
 343
 344         memset(&buffer, 0, sizeof(struct calling_interface_buffer));
 345         buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
 346
 347         if (buffer.input[0] != -1) {
 348                 dell_send_request(&buffer, 0, 2);
 349                 max_intensity = buffer.output[3];
 350         }
 351
 352         if (max_intensity) {
 353                 dell_backlight_device = backlight_device_register(
 354                         "dell_backlight",
 355                         NULL, NULL,
 356                         &dell_ops);
 357
 358                 if (IS_ERR(dell_backlight_device)) {
 359                         ret = PTR_ERR(dell_backlight_device);
 360                         dell_backlight_device = NULL;
 361                         goto out;
 362                 }
 363
 364                 dell_backlight_device->props.max_brightness = max_intensity;
 365                 dell_backlight_device->props.brightness =
 366                         dell_get_intensity(dell_backlight_device);
 367                 backlight_update_status(dell_backlight_device);
 368         }
 369
 370         return 0;
 371 out:
 372         if (wifi_rfkill)
 373                 rfkill_unregister(wifi_rfkill);
 374         if (bluetooth_rfkill)
 375                 rfkill_unregister(bluetooth_rfkill);
 376         if (wwan_rfkill)
 377                 rfkill_unregister(wwan_rfkill);
 378         kfree(da_tokens);
 379         return ret;
 380 }
 381
 382 static void __exit dell_exit(void)
 383 {
 384         backlight_device_unregister(dell_backlight_device);
 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 }
 392
 393 module_init(dell_init);
 394 module_exit(dell_exit);
 395
 396 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
 397 MODULE_DESCRIPTION("Dell laptop driver");
 398 MODULE_LICENSE("GPL");
 399 MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");