Merge branch 'stable/for-jens' of git://git.kernel.org/pub/scm/linux/kernel/git/konra...
[pandora-kernel.git] / 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 static int da_command_address;
64 static int da_command_code;
65 static int da_num_tokens;
66 static struct calling_interface_token *da_tokens;
67
68 static struct platform_driver platform_driver = {
69         .driver = {
70                 .name = "dell-laptop",
71                 .owner = THIS_MODULE,
72         }
73 };
74
75 static struct platform_device *platform_device;
76 static struct backlight_device *dell_backlight_device;
77 static struct rfkill *wifi_rfkill;
78 static struct rfkill *bluetooth_rfkill;
79 static struct rfkill *wwan_rfkill;
80
81 static const struct dmi_system_id __initdata dell_device_table[] = {
82         {
83                 .ident = "Dell laptop",
84                 .matches = {
85                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
86                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
87                 },
88         },
89         {
90                 .matches = {
91                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
92                         DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
93                 },
94         },
95         {
96                 .ident = "Dell Computer Corporation",
97                 .matches = {
98                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
99                         DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
100                 },
101         },
102         { }
103 };
104
105 static struct dmi_system_id __devinitdata dell_blacklist[] = {
106         /* Supported by compal-laptop */
107         {
108                 .ident = "Dell Mini 9",
109                 .matches = {
110                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
111                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 910"),
112                 },
113         },
114         {
115                 .ident = "Dell Mini 10",
116                 .matches = {
117                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
118                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1010"),
119                 },
120         },
121         {
122                 .ident = "Dell Mini 10v",
123                 .matches = {
124                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
125                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1011"),
126                 },
127         },
128         {
129                 .ident = "Dell Mini 1012",
130                 .matches = {
131                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
132                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
133                 },
134         },
135         {
136                 .ident = "Dell Inspiron 11z",
137                 .matches = {
138                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
139                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1110"),
140                 },
141         },
142         {
143                 .ident = "Dell Mini 12",
144                 .matches = {
145                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
146                         DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1210"),
147                 },
148         },
149         {}
150 };
151
152 static struct calling_interface_buffer *buffer;
153 static struct page *bufferpage;
154 static DEFINE_MUTEX(buffer_mutex);
155
156 static int hwswitch_state;
157
158 static void get_buffer(void)
159 {
160         mutex_lock(&buffer_mutex);
161         memset(buffer, 0, sizeof(struct calling_interface_buffer));
162 }
163
164 static void release_buffer(void)
165 {
166         mutex_unlock(&buffer_mutex);
167 }
168
169 static void __init parse_da_table(const struct dmi_header *dm)
170 {
171         /* Final token is a terminator, so we don't want to copy it */
172         int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
173         struct calling_interface_structure *table =
174                 container_of(dm, struct calling_interface_structure, header);
175
176         /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
177            6 bytes of entry */
178
179         if (dm->length < 17)
180                 return;
181
182         da_command_address = table->cmdIOAddress;
183         da_command_code = table->cmdIOCode;
184
185         da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
186                              sizeof(struct calling_interface_token),
187                              GFP_KERNEL);
188
189         if (!da_tokens)
190                 return;
191
192         memcpy(da_tokens+da_num_tokens, table->tokens,
193                sizeof(struct calling_interface_token) * tokens);
194
195         da_num_tokens += tokens;
196 }
197
198 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
199 {
200         switch (dm->type) {
201         case 0xd4: /* Indexed IO */
202                 break;
203         case 0xd5: /* Protected Area Type 1 */
204                 break;
205         case 0xd6: /* Protected Area Type 2 */
206                 break;
207         case 0xda: /* Calling interface */
208                 parse_da_table(dm);
209                 break;
210         }
211 }
212
213 static int find_token_location(int tokenid)
214 {
215         int i;
216         for (i = 0; i < da_num_tokens; i++) {
217                 if (da_tokens[i].tokenID == tokenid)
218                         return da_tokens[i].location;
219         }
220
221         return -1;
222 }
223
224 static struct calling_interface_buffer *
225 dell_send_request(struct calling_interface_buffer *buffer, int class,
226                   int select)
227 {
228         struct smi_cmd command;
229
230         command.magic = SMI_CMD_MAGIC;
231         command.command_address = da_command_address;
232         command.command_code = da_command_code;
233         command.ebx = virt_to_phys(buffer);
234         command.ecx = 0x42534931;
235
236         buffer->class = class;
237         buffer->select = select;
238
239         dcdbas_smi_request(&command);
240
241         return buffer;
242 }
243
244 /* Derived from information in DellWirelessCtl.cpp:
245    Class 17, select 11 is radio control. It returns an array of 32-bit values.
246
247    Input byte 0 = 0: Wireless information
248
249    result[0]: return code
250    result[1]:
251      Bit 0:      Hardware switch supported
252      Bit 1:      Wifi locator supported
253      Bit 2:      Wifi is supported
254      Bit 3:      Bluetooth is supported
255      Bit 4:      WWAN is supported
256      Bit 5:      Wireless keyboard supported
257      Bits 6-7:   Reserved
258      Bit 8:      Wifi is installed
259      Bit 9:      Bluetooth is installed
260      Bit 10:     WWAN is installed
261      Bits 11-15: Reserved
262      Bit 16:     Hardware switch is on
263      Bit 17:     Wifi is blocked
264      Bit 18:     Bluetooth is blocked
265      Bit 19:     WWAN is blocked
266      Bits 20-31: Reserved
267    result[2]: NVRAM size in bytes
268    result[3]: NVRAM format version number
269
270    Input byte 0 = 2: Wireless switch configuration
271    result[0]: return code
272    result[1]:
273      Bit 0:      Wifi controlled by switch
274      Bit 1:      Bluetooth controlled by switch
275      Bit 2:      WWAN controlled by switch
276      Bits 3-6:   Reserved
277      Bit 7:      Wireless switch config locked
278      Bit 8:      Wifi locator enabled
279      Bits 9-14:  Reserved
280      Bit 15:     Wifi locator setting locked
281      Bits 16-31: Reserved
282 */
283
284 static int dell_rfkill_set(void *data, bool blocked)
285 {
286         int disable = blocked ? 1 : 0;
287         unsigned long radio = (unsigned long)data;
288         int hwswitch_bit = (unsigned long)data - 1;
289         int ret = 0;
290
291         get_buffer();
292         dell_send_request(buffer, 17, 11);
293
294         /* If the hardware switch controls this radio, and the hardware
295            switch is disabled, don't allow changing the software state */
296         if ((hwswitch_state & BIT(hwswitch_bit)) &&
297             !(buffer->output[1] & BIT(16))) {
298                 ret = -EINVAL;
299                 goto out;
300         }
301
302         buffer->input[0] = (1 | (radio<<8) | (disable << 16));
303         dell_send_request(buffer, 17, 11);
304
305 out:
306         release_buffer();
307         return ret;
308 }
309
310 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
311 {
312         int status;
313         int bit = (unsigned long)data + 16;
314         int hwswitch_bit = (unsigned long)data - 1;
315
316         get_buffer();
317         dell_send_request(buffer, 17, 11);
318         status = buffer->output[1];
319         release_buffer();
320
321         rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
322
323         if (hwswitch_state & (BIT(hwswitch_bit)))
324                 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
325 }
326
327 static const struct rfkill_ops dell_rfkill_ops = {
328         .set_block = dell_rfkill_set,
329         .query = dell_rfkill_query,
330 };
331
332 static struct dentry *dell_laptop_dir;
333
334 static int dell_debugfs_show(struct seq_file *s, void *data)
335 {
336         int status;
337
338         get_buffer();
339         dell_send_request(buffer, 17, 11);
340         status = buffer->output[1];
341         release_buffer();
342
343         seq_printf(s, "status:\t0x%X\n", status);
344         seq_printf(s, "Bit 0 : Hardware switch supported:   %lu\n",
345                    status & BIT(0));
346         seq_printf(s, "Bit 1 : Wifi locator supported:      %lu\n",
347                   (status & BIT(1)) >> 1);
348         seq_printf(s, "Bit 2 : Wifi is supported:           %lu\n",
349                   (status & BIT(2)) >> 2);
350         seq_printf(s, "Bit 3 : Bluetooth is supported:      %lu\n",
351                   (status & BIT(3)) >> 3);
352         seq_printf(s, "Bit 4 : WWAN is supported:           %lu\n",
353                   (status & BIT(4)) >> 4);
354         seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
355                   (status & BIT(5)) >> 5);
356         seq_printf(s, "Bit 8 : Wifi is installed:           %lu\n",
357                   (status & BIT(8)) >> 8);
358         seq_printf(s, "Bit 9 : Bluetooth is installed:      %lu\n",
359                   (status & BIT(9)) >> 9);
360         seq_printf(s, "Bit 10: WWAN is installed:           %lu\n",
361                   (status & BIT(10)) >> 10);
362         seq_printf(s, "Bit 16: Hardware switch is on:       %lu\n",
363                   (status & BIT(16)) >> 16);
364         seq_printf(s, "Bit 17: Wifi is blocked:             %lu\n",
365                   (status & BIT(17)) >> 17);
366         seq_printf(s, "Bit 18: Bluetooth is blocked:        %lu\n",
367                   (status & BIT(18)) >> 18);
368         seq_printf(s, "Bit 19: WWAN is blocked:             %lu\n",
369                   (status & BIT(19)) >> 19);
370
371         seq_printf(s, "\nhwswitch_state:\t0x%X\n", hwswitch_state);
372         seq_printf(s, "Bit 0 : Wifi controlled by switch:      %lu\n",
373                    hwswitch_state & BIT(0));
374         seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
375                    (hwswitch_state & BIT(1)) >> 1);
376         seq_printf(s, "Bit 2 : WWAN controlled by switch:      %lu\n",
377                    (hwswitch_state & BIT(2)) >> 2);
378         seq_printf(s, "Bit 7 : Wireless switch config locked:  %lu\n",
379                    (hwswitch_state & BIT(7)) >> 7);
380         seq_printf(s, "Bit 8 : Wifi locator enabled:           %lu\n",
381                    (hwswitch_state & BIT(8)) >> 8);
382         seq_printf(s, "Bit 15: Wifi locator setting locked:    %lu\n",
383                    (hwswitch_state & BIT(15)) >> 15);
384
385         return 0;
386 }
387
388 static int dell_debugfs_open(struct inode *inode, struct file *file)
389 {
390         return single_open(file, dell_debugfs_show, inode->i_private);
391 }
392
393 static const struct file_operations dell_debugfs_fops = {
394         .owner = THIS_MODULE,
395         .open = dell_debugfs_open,
396         .read = seq_read,
397         .llseek = seq_lseek,
398         .release = single_release,
399 };
400
401 static void dell_update_rfkill(struct work_struct *ignored)
402 {
403         if (wifi_rfkill)
404                 dell_rfkill_query(wifi_rfkill, (void *)1);
405         if (bluetooth_rfkill)
406                 dell_rfkill_query(bluetooth_rfkill, (void *)2);
407         if (wwan_rfkill)
408                 dell_rfkill_query(wwan_rfkill, (void *)3);
409 }
410 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
411
412
413 static int __init dell_setup_rfkill(void)
414 {
415         int status;
416         int ret;
417
418         if (dmi_check_system(dell_blacklist)) {
419                 pr_info("Blacklisted hardware detected - not enabling rfkill\n");
420                 return 0;
421         }
422
423         get_buffer();
424         dell_send_request(buffer, 17, 11);
425         status = buffer->output[1];
426         buffer->input[0] = 0x2;
427         dell_send_request(buffer, 17, 11);
428         hwswitch_state = buffer->output[1];
429         release_buffer();
430
431         if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
432                 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
433                                            RFKILL_TYPE_WLAN,
434                                            &dell_rfkill_ops, (void *) 1);
435                 if (!wifi_rfkill) {
436                         ret = -ENOMEM;
437                         goto err_wifi;
438                 }
439                 ret = rfkill_register(wifi_rfkill);
440                 if (ret)
441                         goto err_wifi;
442         }
443
444         if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
445                 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
446                                                 &platform_device->dev,
447                                                 RFKILL_TYPE_BLUETOOTH,
448                                                 &dell_rfkill_ops, (void *) 2);
449                 if (!bluetooth_rfkill) {
450                         ret = -ENOMEM;
451                         goto err_bluetooth;
452                 }
453                 ret = rfkill_register(bluetooth_rfkill);
454                 if (ret)
455                         goto err_bluetooth;
456         }
457
458         if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
459                 wwan_rfkill = rfkill_alloc("dell-wwan",
460                                            &platform_device->dev,
461                                            RFKILL_TYPE_WWAN,
462                                            &dell_rfkill_ops, (void *) 3);
463                 if (!wwan_rfkill) {
464                         ret = -ENOMEM;
465                         goto err_wwan;
466                 }
467                 ret = rfkill_register(wwan_rfkill);
468                 if (ret)
469                         goto err_wwan;
470         }
471
472         return 0;
473 err_wwan:
474         rfkill_destroy(wwan_rfkill);
475         if (bluetooth_rfkill)
476                 rfkill_unregister(bluetooth_rfkill);
477 err_bluetooth:
478         rfkill_destroy(bluetooth_rfkill);
479         if (wifi_rfkill)
480                 rfkill_unregister(wifi_rfkill);
481 err_wifi:
482         rfkill_destroy(wifi_rfkill);
483
484         return ret;
485 }
486
487 static void dell_cleanup_rfkill(void)
488 {
489         if (wifi_rfkill) {
490                 rfkill_unregister(wifi_rfkill);
491                 rfkill_destroy(wifi_rfkill);
492         }
493         if (bluetooth_rfkill) {
494                 rfkill_unregister(bluetooth_rfkill);
495                 rfkill_destroy(bluetooth_rfkill);
496         }
497         if (wwan_rfkill) {
498                 rfkill_unregister(wwan_rfkill);
499                 rfkill_destroy(wwan_rfkill);
500         }
501 }
502
503 static int dell_send_intensity(struct backlight_device *bd)
504 {
505         int ret = 0;
506
507         get_buffer();
508         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
509         buffer->input[1] = bd->props.brightness;
510
511         if (buffer->input[0] == -1) {
512                 ret = -ENODEV;
513                 goto out;
514         }
515
516         if (power_supply_is_system_supplied() > 0)
517                 dell_send_request(buffer, 1, 2);
518         else
519                 dell_send_request(buffer, 1, 1);
520
521 out:
522         release_buffer();
523         return 0;
524 }
525
526 static int dell_get_intensity(struct backlight_device *bd)
527 {
528         int ret = 0;
529
530         get_buffer();
531         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
532
533         if (buffer->input[0] == -1) {
534                 ret = -ENODEV;
535                 goto out;
536         }
537
538         if (power_supply_is_system_supplied() > 0)
539                 dell_send_request(buffer, 0, 2);
540         else
541                 dell_send_request(buffer, 0, 1);
542
543         ret = buffer->output[1];
544
545 out:
546         release_buffer();
547         return ret;
548 }
549
550 static const struct backlight_ops dell_ops = {
551         .get_brightness = dell_get_intensity,
552         .update_status  = dell_send_intensity,
553 };
554
555 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
556                               struct serio *port)
557 {
558         static bool extended;
559
560         if (str & 0x20)
561                 return false;
562
563         if (unlikely(data == 0xe0)) {
564                 extended = true;
565                 return false;
566         } else if (unlikely(extended)) {
567                 switch (data) {
568                 case 0x8:
569                         schedule_delayed_work(&dell_rfkill_work,
570                                               round_jiffies_relative(HZ));
571                         break;
572                 }
573                 extended = false;
574         }
575
576         return false;
577 }
578
579 static int __init dell_init(void)
580 {
581         int max_intensity = 0;
582         int ret;
583
584         if (!dmi_check_system(dell_device_table))
585                 return -ENODEV;
586
587         dmi_walk(find_tokens, NULL);
588
589         if (!da_tokens)  {
590                 pr_info("Unable to find dmi tokens\n");
591                 return -ENODEV;
592         }
593
594         ret = platform_driver_register(&platform_driver);
595         if (ret)
596                 goto fail_platform_driver;
597         platform_device = platform_device_alloc("dell-laptop", -1);
598         if (!platform_device) {
599                 ret = -ENOMEM;
600                 goto fail_platform_device1;
601         }
602         ret = platform_device_add(platform_device);
603         if (ret)
604                 goto fail_platform_device2;
605
606         /*
607          * Allocate buffer below 4GB for SMI data--only 32-bit physical addr
608          * is passed to SMI handler.
609          */
610         bufferpage = alloc_page(GFP_KERNEL | GFP_DMA32);
611
612         if (!bufferpage)
613                 goto fail_buffer;
614         buffer = page_address(bufferpage);
615
616         ret = dell_setup_rfkill();
617
618         if (ret) {
619                 pr_warn("Unable to setup rfkill\n");
620                 goto fail_rfkill;
621         }
622
623         ret = i8042_install_filter(dell_laptop_i8042_filter);
624         if (ret) {
625                 pr_warn("Unable to install key filter\n");
626                 goto fail_filter;
627         }
628
629         dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
630         if (dell_laptop_dir != NULL)
631                 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
632                                     &dell_debugfs_fops);
633
634 #ifdef CONFIG_ACPI
635         /* In the event of an ACPI backlight being available, don't
636          * register the platform controller.
637          */
638         if (acpi_video_backlight_support())
639                 return 0;
640 #endif
641
642         get_buffer();
643         buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
644         if (buffer->input[0] != -1) {
645                 dell_send_request(buffer, 0, 2);
646                 max_intensity = buffer->output[3];
647         }
648         release_buffer();
649
650         if (max_intensity) {
651                 struct backlight_properties props;
652                 memset(&props, 0, sizeof(struct backlight_properties));
653                 props.type = BACKLIGHT_PLATFORM;
654                 props.max_brightness = max_intensity;
655                 dell_backlight_device = backlight_device_register("dell_backlight",
656                                                                   &platform_device->dev,
657                                                                   NULL,
658                                                                   &dell_ops,
659                                                                   &props);
660
661                 if (IS_ERR(dell_backlight_device)) {
662                         ret = PTR_ERR(dell_backlight_device);
663                         dell_backlight_device = NULL;
664                         goto fail_backlight;
665                 }
666
667                 dell_backlight_device->props.brightness =
668                         dell_get_intensity(dell_backlight_device);
669                 backlight_update_status(dell_backlight_device);
670         }
671
672         return 0;
673
674 fail_backlight:
675         i8042_remove_filter(dell_laptop_i8042_filter);
676         cancel_delayed_work_sync(&dell_rfkill_work);
677 fail_filter:
678         dell_cleanup_rfkill();
679 fail_rfkill:
680         free_page((unsigned long)bufferpage);
681 fail_buffer:
682         platform_device_del(platform_device);
683 fail_platform_device2:
684         platform_device_put(platform_device);
685 fail_platform_device1:
686         platform_driver_unregister(&platform_driver);
687 fail_platform_driver:
688         kfree(da_tokens);
689         return ret;
690 }
691
692 static void __exit dell_exit(void)
693 {
694         debugfs_remove_recursive(dell_laptop_dir);
695         i8042_remove_filter(dell_laptop_i8042_filter);
696         cancel_delayed_work_sync(&dell_rfkill_work);
697         backlight_device_unregister(dell_backlight_device);
698         dell_cleanup_rfkill();
699         if (platform_device) {
700                 platform_device_unregister(platform_device);
701                 platform_driver_unregister(&platform_driver);
702         }
703         kfree(da_tokens);
704         free_page((unsigned long)buffer);
705 }
706
707 module_init(dell_init);
708 module_exit(dell_exit);
709
710 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
711 MODULE_DESCRIPTION("Dell laptop driver");
712 MODULE_LICENSE("GPL");
713 MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");
714 MODULE_ALIAS("dmi:*svnDellInc.:*:ct9:*");
715 MODULE_ALIAS("dmi:*svnDellComputerCorporation.:*:ct8:*");