Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 15 
 16 #include <linux/module.h>
 17 #include <linux/kernel.h>
 18 #include <linux/init.h>
 19 #include <linux/platform_device.h>
 20 #include <linux/backlight.h>
 21 #include <linux/err.h>
 22 #include <linux/dmi.h>
 23 #include <linux/io.h>
 24 #include <linux/rfkill.h>
 25 #include <linux/power_supply.h>
 26 #include <linux/acpi.h>
 27 #include <linux/mm.h>
 28 #include <linux/i8042.h>
 29 #include <linux/slab.h>
 30 #include <linux/debugfs.h>
 31 #include <linux/seq_file.h>
 32 #include "../../firmware/dcdbas.h"
 33 
 34 #define BRIGHTNESS_TOKEN 0x7d
 35 
 36 /* This structure will be modified by the firmware when we enter
 37  * system management mode, hence the volatiles */
 38 
 39 struct calling_interface_buffer {
 40         u16 class;
 41         u16 select;
 42         volatile u32 input[4];
 43         volatile u32 output[4];
 44 } __packed;
 45 
 46 struct calling_interface_token {
 47         u16 tokenID;
 48         u16 location;
 49         union {
 50                 u16 value;
 51                 u16 stringlength;
 52         };
 53 };
 54 
 55 struct calling_interface_structure {
 56         struct dmi_header header;
 57         u16 cmdIOAddress;
 58         u8 cmdIOCode;
 59         u32 supportedCmds;
 60         struct calling_interface_token tokens[];
 61 } __packed;
 62 
 63 struct quirk_entry {
 64         u8 touchpad_led;
 65 };
 66 
 67 static struct quirk_entry *quirks;
 68 
 69 static struct quirk_entry quirk_dell_vostro_v130 = {
 70         .touchpad_led = 1,
 71 };
 72 
 73 static int __init dmi_matched(const struct dmi_system_id *dmi)
 74 {
 75         quirks = dmi->driver_data;
 76         return 1;
 77 }
 78 
 79 static int da_command_address;
 80 static int da_command_code;
 81 static int da_num_tokens;
 82 static struct calling_interface_token *da_tokens;
 83 
 84 static struct platform_driver platform_driver = {
 85         .driver = {
 86                 .name = "dell-laptop",
 87                 .owner = THIS_MODULE,
 88         }
 89 };
 90 
 91 static struct platform_device *platform_device;
 92 static struct backlight_device *dell_backlight_device;
 93 static struct rfkill *wifi_rfkill;
 94 static struct rfkill *bluetooth_rfkill;
 95 static struct rfkill *wwan_rfkill;
 96 static bool force_rfkill;
 97 
 98 module_param(force_rfkill, bool, 0444);
 99 MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
100 
101 static const struct dmi_system_id dell_device_table[] __initconst = {
102         {
103                 .ident = "Dell laptop",
104                 .matches = {
105                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
106                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
107                 },
108         },
109         {
110                 .matches = {
111                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
112                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
113                 },
114         },
115         {
116                 .ident = "Dell Computer Corporation",
117                 .matches = {
118                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
119                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
120                 },
121         },
122         { }
123 };
124 MODULE_DEVICE_TABLE(dmi, dell_device_table);
125 
126 static const struct dmi_system_id dell_quirks[] __initconst = {
127         {
128                 .callback = dmi_matched,
129                 .ident = "Dell Vostro V130",
130                 .matches = {
131                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
132                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
133                 },
134                 .driver_data = &quirk_dell_vostro_v130,
135         },
136         {
137                 .callback = dmi_matched,
138                 .ident = "Dell Vostro V131",
139                 .matches = {
140                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
141                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
142                 },
143                 .driver_data = &quirk_dell_vostro_v130,
144         },
145         {
146                 .callback = dmi_matched,
147                 .ident = "Dell Vostro 3350",
148                 .matches = {
149                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
150                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
151                 },
152                 .driver_data = &quirk_dell_vostro_v130,
153         },
154         {
155                 .callback = dmi_matched,
156                 .ident = "Dell Vostro 3555",
157                 .matches = {
158                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
159                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3555"),
160                 },
161                 .driver_data = &quirk_dell_vostro_v130,
162         },
163         {
164                 .callback = dmi_matched,
165                 .ident = "Dell Inspiron N311z",
166                 .matches = {
167                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
168                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron N311z"),
169                 },
170                 .driver_data = &quirk_dell_vostro_v130,
171         },
172         {
173                 .callback = dmi_matched,
174                 .ident = "Dell Inspiron M5110",
175                 .matches = {
176                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
177                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"),
178                 },
179                 .driver_data = &quirk_dell_vostro_v130,
180         },
181         {
182                 .callback = dmi_matched,
183                 .ident = "Dell Vostro 3360",
184                 .matches = {
185                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
186                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3360"),
187                 },
188                 .driver_data = &quirk_dell_vostro_v130,
189         },
190         {
191                 .callback = dmi_matched,
192                 .ident = "Dell Vostro 3460",
193                 .matches = {
194                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
195                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3460"),
196                 },
197                 .driver_data = &quirk_dell_vostro_v130,
198         },
199         {
200                 .callback = dmi_matched,
201                 .ident = "Dell Vostro 3560",
202                 .matches = {
203                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
204                         DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3560"),
205                 },
206                 .driver_data = &quirk_dell_vostro_v130,
207         },
208         {
209                 .callback = dmi_matched,
210                 .ident = "Dell Vostro 3450",
211                 .matches = {
212                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
213                         DMI_MATCH(DMI_PRODUCT_NAME, "Dell System Vostro 3450"),
214                 },
215                 .driver_data = &quirk_dell_vostro_v130,
216         },
217         {
218                 .callback = dmi_matched,
219                 .ident = "Dell Inspiron 5420",
220                 .matches = {
221                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
222                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5420"),
223                 },
224                 .driver_data = &quirk_dell_vostro_v130,
225         },
226         {
227                 .callback = dmi_matched,
228                 .ident = "Dell Inspiron 5520",
229                 .matches = {
230                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
231                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5520"),
232                 },
233                 .driver_data = &quirk_dell_vostro_v130,
234         },
235         {
236                 .callback = dmi_matched,
237                 .ident = "Dell Inspiron 5720",
238                 .matches = {
239                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
240                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5720"),
241                 },
242                 .driver_data = &quirk_dell_vostro_v130,
243         },
244         {
245                 .callback = dmi_matched,
246                 .ident = "Dell Inspiron 7420",
247                 .matches = {
248                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
249                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7420"),
250                 },
251                 .driver_data = &quirk_dell_vostro_v130,
252         },
253         {
254                 .callback = dmi_matched,
255                 .ident = "Dell Inspiron 7520",
256                 .matches = {
257                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
258                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7520"),
259                 },
260                 .driver_data = &quirk_dell_vostro_v130,
261         },
262         {
263                 .callback = dmi_matched,
264                 .ident = "Dell Inspiron 7720",
265                 .matches = {
266                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
267                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7720"),
268                 },
269                 .driver_data = &quirk_dell_vostro_v130,
270         },
271         { }
272 };
273 
274 static struct calling_interface_buffer *buffer;
275 static struct page *bufferpage;
276 static DEFINE_MUTEX(buffer_mutex);
277 
278 static int hwswitch_state;
279 
280 static void get_buffer(void)
281 {
282         mutex_lock(&buffer_mutex);
283         memset(buffer, 0, sizeof(struct calling_interface_buffer));
284 }
285 
286 static void release_buffer(void)
287 {
288         mutex_unlock(&buffer_mutex);
289 }
290 
291 static void __init parse_da_table(const struct dmi_header *dm)
292 {
293         /* Final token is a terminator, so we don't want to copy it */
294         int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
295         struct calling_interface_token *new_da_tokens;
296         struct calling_interface_structure *table =
297                 container_of(dm, struct calling_interface_structure, header);
298 
299         /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
300            6 bytes of entry */
301 
302         if (dm->length < 17)
303                 return;
304 
305         da_command_address = table->cmdIOAddress;
306         da_command_code = table->cmdIOCode;
307 
308         new_da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
309                                  sizeof(struct calling_interface_token),
310                                  GFP_KERNEL);
311 
312         if (!new_da_tokens)
313                 return;
314         da_tokens = new_da_tokens;
315 
316         memcpy(da_tokens+da_num_tokens, table->tokens,
317                sizeof(struct calling_interface_token) * tokens);
318 
319         da_num_tokens += tokens;
320 }
321 
322 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
323 {
324         switch (dm->type) {
325         case 0xd4: /* Indexed IO */
326         case 0xd5: /* Protected Area Type 1 */
327         case 0xd6: /* Protected Area Type 2 */
328                 break;
329         case 0xda: /* Calling interface */
330                 parse_da_table(dm);
331                 break;
332         }
333 }
334 
335 static int find_token_location(int tokenid)
336 {
337         int i;
338         for (i = 0; i < da_num_tokens; i++) {
339                 if (da_tokens[i].tokenID == tokenid)
340                         return da_tokens[i].location;
341         }
342 
343         return -1;
344 }
345 
346 static struct calling_interface_buffer *
347 dell_send_request(struct calling_interface_buffer *buffer, int class,
348                   int select)
349 {
350         struct smi_cmd command;
351 
352         command.magic = SMI_CMD_MAGIC;
353         command.command_address = da_command_address;
354         command.command_code = da_command_code;
355         command.ebx = virt_to_phys(buffer);
356         command.ecx = 0x42534931;
357 
358         buffer->class = class;
359         buffer->select = select;
360 
361         dcdbas_smi_request(&command);
362 
363         return buffer;
364 }
365 
366 /* Derived from information in DellWirelessCtl.cpp:
367    Class 17, select 11 is radio control. It returns an array of 32-bit values.
368 
369    Input byte 0 = 0: Wireless information
370 
371    result[0]: return code
372    result[1]:
373      Bit 0:      Hardware switch supported
374      Bit 1:      Wifi locator supported
375      Bit 2:      Wifi is supported
376      Bit 3:      Bluetooth is supported
377      Bit 4:      WWAN is supported
378      Bit 5:      Wireless keyboard supported
379      Bits 6-7:   Reserved
380      Bit 8:      Wifi is installed
381      Bit 9:      Bluetooth is installed
382      Bit 10:     WWAN is installed
383      Bits 11-15: Reserved
384      Bit 16:     Hardware switch is on
385      Bit 17:     Wifi is blocked
386      Bit 18:     Bluetooth is blocked
387      Bit 19:     WWAN is blocked
388      Bits 20-31: Reserved
389    result[2]: NVRAM size in bytes
390    result[3]: NVRAM format version number
391 
392    Input byte 0 = 2: Wireless switch configuration
393    result[0]: return code
394    result[1]:
395      Bit 0:      Wifi controlled by switch
396      Bit 1:      Bluetooth controlled by switch
397      Bit 2:      WWAN controlled by switch
398      Bits 3-6:   Reserved
399      Bit 7:      Wireless switch config locked
400      Bit 8:      Wifi locator enabled
401      Bits 9-14:  Reserved
402      Bit 15:     Wifi locator setting locked
403      Bits 16-31: Reserved
404 */
405 
406 static int dell_rfkill_set(void *data, bool blocked)
407 {
408         int disable = blocked ? 1 : 0;
409         unsigned long radio = (unsigned long)data;
410         int hwswitch_bit = (unsigned long)data - 1;
411 
412         get_buffer();
413         dell_send_request(buffer, 17, 11);
414 
415         /* If the hardware switch controls this radio, and the hardware
416            switch is disabled, always disable the radio */
417         if ((hwswitch_state & BIT(hwswitch_bit)) &&
418             !(buffer->output[1] & BIT(16)))
419                 disable = 1;
420 
421         buffer->input[0] = (1 | (radio<<8) | (disable << 16));
422         dell_send_request(buffer, 17, 11);
423 
424         release_buffer();
425         return 0;
426 }
427 
428 /* Must be called with the buffer held */
429 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
430                                         int status)
431 {
432         if (status & BIT(0)) {
433                 /* Has hw-switch, sync sw_state to BIOS */
434                 int block = rfkill_blocked(rfkill);
435                 buffer->input[0] = (1 | (radio << 8) | (block << 16));
436                 dell_send_request(buffer, 17, 11);
437         } else {
438                 /* No hw-switch, sync BIOS state to sw_state */
439                 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
440         }
441 }
442 
443 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
444                                         int status)
445 {
446         if (hwswitch_state & (BIT(radio - 1)))
447                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
448 }
449 
450 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
451 {
452         int status;
453 
454         get_buffer();
455         dell_send_request(buffer, 17, 11);
456         status = buffer->output[1];
457 
458         dell_rfkill_update_hw_state(rfkill, (unsigned long)data, status);
459 
460         release_buffer();
461 }
462 
463 static const struct rfkill_ops dell_rfkill_ops = {
464         .set_block = dell_rfkill_set,
465         .query = dell_rfkill_query,
466 };
467 
468 static struct dentry *dell_laptop_dir;
469 
470 static int dell_debugfs_show(struct seq_file *s, void *data)
471 {
472         int status;
473 
474         get_buffer();
475         dell_send_request(buffer, 17, 11);
476         status = buffer->output[1];
477         release_buffer();
478 
479         seq_printf(s, "status:\t0x%X\n", status);
480         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
481                    status & BIT(0));
482         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
483                   (status & BIT(1)) >> 1);
484         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
485                   (status & BIT(2)) >> 2);
486         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
487                   (status & BIT(3)) >> 3);
488         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
489                   (status & BIT(4)) >> 4);
490         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
491                   (status & BIT(5)) >> 5);
492         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
493                   (status & BIT(8)) >> 8);
494         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
495                   (status & BIT(9)) >> 9);
496         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
497                   (status & BIT(10)) >> 10);
498         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
499                   (status & BIT(16)) >> 16);
500         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
501                   (status & BIT(17)) >> 17);
502         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
503                   (status & BIT(18)) >> 18);
504         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
505                   (status & BIT(19)) >> 19);
506 
507         seq_printf(s, "\nhwswitch_state:\t0x%X\n", hwswitch_state);
508         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
509                    hwswitch_state & BIT(0));
510         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
511                    (hwswitch_state & BIT(1)) >> 1);
512         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
513                    (hwswitch_state & BIT(2)) >> 2);
514         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
515                    (hwswitch_state & BIT(7)) >> 7);
516         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
517                    (hwswitch_state & BIT(8)) >> 8);
518         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
519                    (hwswitch_state & BIT(15)) >> 15);
520 
521         return 0;
522 }
523 
524 static int dell_debugfs_open(struct inode *inode, struct file *file)
525 {
526         return single_open(file, dell_debugfs_show, inode->i_private);
527 }
528 
529 static const struct file_operations dell_debugfs_fops = {
530         .owner = THIS_MODULE,
531         .open = dell_debugfs_open,
532         .read = seq_read,
533         .llseek = seq_lseek,
534         .release = single_release,
535 };
536 
537 static void dell_update_rfkill(struct work_struct *ignored)
538 {
539         int status;
540 
541         get_buffer();
542         dell_send_request(buffer, 17, 11);
543         status = buffer->output[1];
544 
545         if (wifi_rfkill) {
546                 dell_rfkill_update_hw_state(wifi_rfkill, 1, status);
547                 dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
548         }
549         if (bluetooth_rfkill) {
550                 dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status);
551                 dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
552         }
553         if (wwan_rfkill) {
554                 dell_rfkill_update_hw_state(wwan_rfkill, 3, status);
555                 dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
556         }
557 
558         release_buffer();
559 }
560 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
561 
562 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
563                               struct serio *port)
564 {
565         static bool extended;
566 
567         if (str & 0x20)
568                 return false;
569 
570         if (unlikely(data == 0xe0)) {
571                 extended = true;
572                 return false;
573         } else if (unlikely(extended)) {
574                 switch (data) {
575                 case 0x8:
576                         schedule_delayed_work(&dell_rfkill_work,
577                                               round_jiffies_relative(HZ / 4));
578                         break;
579                 }
580                 extended = false;
581         }
582 
583         return false;
584 }
585 
586 static int __init dell_setup_rfkill(void)
587 {
588         int status, ret, whitelisted;
589         const char *product;
590 
591         /*
592          * rfkill support causes trouble on various models, mostly Inspirons.
593          * So we whitelist certain series, and don't support rfkill on others.
594          */
595         whitelisted = 0;
596         product = dmi_get_system_info(DMI_PRODUCT_NAME);
597         if (product &&  (strncmp(product, "Latitude", 8) == 0 ||
598                          strncmp(product, "Precision", 9) == 0))
599                 whitelisted = 1;
600         if (!force_rfkill && !whitelisted)
601                 return 0;
602 
603         get_buffer();
604         dell_send_request(buffer, 17, 11);
605         status = buffer->output[1];
606         buffer->input[0] = 0x2;
607         dell_send_request(buffer, 17, 11);
608         hwswitch_state = buffer->output[1];
609         release_buffer();
610 
611         if (!(status & BIT(0))) {
612                 if (force_rfkill) {
613                         /* No hwsitch, clear all hw-controlled bits */
614                         hwswitch_state &= ~7;
615                 } else {
616                         /* rfkill is only tested on laptops with a hwswitch */
617                         return 0;
618                 }
619         }
620 
621         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
622                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
623                                            RFKILL_TYPE_WLAN,
624                                            &dell_rfkill_ops, (void *) 1);
625                 if (!wifi_rfkill) {
626                         ret = -ENOMEM;
627                         goto err_wifi;
628                 }
629                 ret = rfkill_register(wifi_rfkill);
630                 if (ret)
631                         goto err_wifi;
632         }
633 
634         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
635                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
636                                                 &platform_device->dev,
637                                                 RFKILL_TYPE_BLUETOOTH,
638                                                 &dell_rfkill_ops, (void *) 2);
639                 if (!bluetooth_rfkill) {
640                         ret = -ENOMEM;
641                         goto err_bluetooth;
642                 }
643                 ret = rfkill_register(bluetooth_rfkill);
644                 if (ret)
645                         goto err_bluetooth;
646         }
647 
648         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
649                 wwan_rfkill = rfkill_alloc("dell-wwan",
650                                            &platform_device->dev,
651                                            RFKILL_TYPE_WWAN,
652                                            &dell_rfkill_ops, (void *) 3);
653                 if (!wwan_rfkill) {
654                         ret = -ENOMEM;
655                         goto err_wwan;
656                 }
657                 ret = rfkill_register(wwan_rfkill);
658                 if (ret)
659                         goto err_wwan;
660         }
661 
662         ret = i8042_install_filter(dell_laptop_i8042_filter);
663         if (ret) {
664                 pr_warn("Unable to install key filter\n");
665                 goto err_filter;
666         }
667 
668         return 0;
669 err_filter:
670         if (wwan_rfkill)
671                 rfkill_unregister(wwan_rfkill);
672 err_wwan:
673         rfkill_destroy(wwan_rfkill);
674         if (bluetooth_rfkill)
675                 rfkill_unregister(bluetooth_rfkill);
676 err_bluetooth:
677         rfkill_destroy(bluetooth_rfkill);
678         if (wifi_rfkill)
679                 rfkill_unregister(wifi_rfkill);
680 err_wifi:
681         rfkill_destroy(wifi_rfkill);
682 
683         return ret;
684 }
685 
686 static void dell_cleanup_rfkill(void)
687 {
688         if (wifi_rfkill) {
689                 rfkill_unregister(wifi_rfkill);
690                 rfkill_destroy(wifi_rfkill);
691         }
692         if (bluetooth_rfkill) {
693                 rfkill_unregister(bluetooth_rfkill);
694                 rfkill_destroy(bluetooth_rfkill);
695         }
696         if (wwan_rfkill) {
697                 rfkill_unregister(wwan_rfkill);
698                 rfkill_destroy(wwan_rfkill);
699         }
700 }
701 
702 static int dell_send_intensity(struct backlight_device *bd)
703 {
704         int ret = 0;
705 
706         get_buffer();
707         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
708         buffer->input[1] = bd->props.brightness;
709 
710         if (buffer->input[0] == -1) {
711                 ret = -ENODEV;
712                 goto out;
713         }
714 
715         if (power_supply_is_system_supplied() > 0)
716                 dell_send_request(buffer, 1, 2);
717         else
718                 dell_send_request(buffer, 1, 1);
719 
720 out:
721         release_buffer();
722         return ret;
723 }
724 
725 static int dell_get_intensity(struct backlight_device *bd)
726 {
727         int ret = 0;
728 
729         get_buffer();
730         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
731 
732         if (buffer->input[0] == -1) {
733                 ret = -ENODEV;
734                 goto out;
735         }
736 
737         if (power_supply_is_system_supplied() > 0)
738                 dell_send_request(buffer, 0, 2);
739         else
740                 dell_send_request(buffer, 0, 1);
741 
742         ret = buffer->output[1];
743 
744 out:
745         release_buffer();
746         return ret;
747 }
748 
749 static const struct backlight_ops dell_ops = {
750         .get_brightness = dell_get_intensity,
751         .update_status  = dell_send_intensity,
752 };
753 
754 static void touchpad_led_on(void)
755 {
756         int command = 0x97;
757         char data = 1;
758         i8042_command(&data, command | 1 << 12);
759 }
760 
761 static void touchpad_led_off(void)
762 {
763         int command = 0x97;
764         char data = 2;
765         i8042_command(&data, command | 1 << 12);
766 }
767 
768 static void touchpad_led_set(struct led_classdev *led_cdev,
769         enum led_brightness value)
770 {
771         if (value > 0)
772                 touchpad_led_on();
773         else
774                 touchpad_led_off();
775 }
776 
777 static struct led_classdev touchpad_led = {
778         .name = "dell-laptop::touchpad",
779         .brightness_set = touchpad_led_set,
780         .flags = LED_CORE_SUSPENDRESUME,
781 };
782 
783 static int __init touchpad_led_init(struct device *dev)
784 {
785         return led_classdev_register(dev, &touchpad_led);
786 }
787 
788 static void touchpad_led_exit(void)
789 {
790         led_classdev_unregister(&touchpad_led);
791 }
792 
793 static int __init dell_init(void)
794 {
795         int max_intensity = 0;
796         int ret;
797 
798         if (!dmi_check_system(dell_device_table))
799                 return -ENODEV;
800 
801         quirks = NULL;
802         /* find if this machine support other functions */
803         dmi_check_system(dell_quirks);
804 
805         dmi_walk(find_tokens, NULL);
806 
807         if (!da_tokens)  {
808                 pr_info("Unable to find dmi tokens\n");
809                 return -ENODEV;
810         }
811 
812         ret = platform_driver_register(&platform_driver);
813         if (ret)
814                 goto fail_platform_driver;
815         platform_device = platform_device_alloc("dell-laptop", -1);
816         if (!platform_device) {
817                 ret = -ENOMEM;
818                 goto fail_platform_device1;
819         }
820         ret = platform_device_add(platform_device);
821         if (ret)
822                 goto fail_platform_device2;
823 
824         /*
825          * Allocate buffer below 4GB for SMI data--only 32-bit physical addr
826          * is passed to SMI handler.
827          */
828         bufferpage = alloc_page(GFP_KERNEL | GFP_DMA32);
829         if (!bufferpage) {
830                 ret = -ENOMEM;
831                 goto fail_buffer;
832         }
833         buffer = page_address(bufferpage);
834 
835         ret = dell_setup_rfkill();
836 
837         if (ret) {
838                 pr_warn("Unable to setup rfkill\n");
839                 goto fail_rfkill;
840         }
841 
842         if (quirks && quirks->touchpad_led)
843                 touchpad_led_init(&platform_device->dev);
844 
845         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
846         if (dell_laptop_dir != NULL)
847                 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
848                                     &dell_debugfs_fops);
849 
850 #ifdef CONFIG_ACPI
851         /* In the event of an ACPI backlight being available, don't
852          * register the platform controller.
853          */
854         if (acpi_video_backlight_support())
855                 return 0;
856 #endif
857 
858         get_buffer();
859         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
860         if (buffer->input[0] != -1) {
861                 dell_send_request(buffer, 0, 2);
862                 max_intensity = buffer->output[3];
863         }
864         release_buffer();
865 
866         if (max_intensity) {
867                 struct backlight_properties props;
868                 memset(&props, 0, sizeof(struct backlight_properties));
869                 props.type = BACKLIGHT_PLATFORM;
870                 props.max_brightness = max_intensity;
871                 dell_backlight_device = backlight_device_register("dell_backlight",
872                                                                   &platform_device->dev,
873                                                                   NULL,
874                                                                   &dell_ops,
875                                                                   &props);
876 
877                 if (IS_ERR(dell_backlight_device)) {
878                         ret = PTR_ERR(dell_backlight_device);
879                         dell_backlight_device = NULL;
880                         goto fail_backlight;
881                 }
882 
883                 dell_backlight_device->props.brightness =
884                         dell_get_intensity(dell_backlight_device);
885                 backlight_update_status(dell_backlight_device);
886         }
887 
888         return 0;
889 
890 fail_backlight:
891         i8042_remove_filter(dell_laptop_i8042_filter);
892         cancel_delayed_work_sync(&dell_rfkill_work);
893         dell_cleanup_rfkill();
894 fail_rfkill:
895         free_page((unsigned long)bufferpage);
896 fail_buffer:
897         platform_device_del(platform_device);
898 fail_platform_device2:
899         platform_device_put(platform_device);
900 fail_platform_device1:
901         platform_driver_unregister(&platform_driver);
902 fail_platform_driver:
903         kfree(da_tokens);
904         return ret;
905 }
906 
907 static void __exit dell_exit(void)
908 {
909         debugfs_remove_recursive(dell_laptop_dir);
910         if (quirks && quirks->touchpad_led)
911                 touchpad_led_exit();
912         i8042_remove_filter(dell_laptop_i8042_filter);
913         cancel_delayed_work_sync(&dell_rfkill_work);
914         backlight_device_unregister(dell_backlight_device);
915         dell_cleanup_rfkill();
916         if (platform_device) {
917                 platform_device_unregister(platform_device);
918                 platform_driver_unregister(&platform_driver);
919         }
920         kfree(da_tokens);
921         free_page((unsigned long)buffer);
922 }
923 
924 module_init(dell_init);
925 module_exit(dell_exit);
926 
927 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
928 MODULE_DESCRIPTION("Dell laptop driver");
929 MODULE_LICENSE("GPL");
930 

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