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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
39struct calling_interface_buffer {
40 u16 class;
41 u16 select;
42 volatile u32 input[4];
43 volatile u32 output[4];
44} __packed;
45
46struct calling_interface_token {
47 u16 tokenID;
48 u16 location;
49 union {
50 u16 value;
51 u16 stringlength;
52 };
53};
54
55struct 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
63static int da_command_address;
64static int da_command_code;
65static int da_num_tokens;
66static struct calling_interface_token *da_tokens;
67
68static struct platform_driver platform_driver = {
69 .driver = {
70 .name = "dell-laptop",
71 .owner = THIS_MODULE,
72 }
73};
74
75static struct platform_device *platform_device;
76static struct backlight_device *dell_backlight_device;
77static struct rfkill *wifi_rfkill;
78static struct rfkill *bluetooth_rfkill;
79static struct rfkill *wwan_rfkill;
80
81static 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
105static 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
152static struct calling_interface_buffer *buffer;
153static struct page *bufferpage;
154static DEFINE_MUTEX(buffer_mutex);
155
156static int hwswitch_state;
157
158static void get_buffer(void)
159{
160 mutex_lock(&buffer_mutex);
161 memset(buffer, 0, sizeof(struct calling_interface_buffer));
162}
163
164static void release_buffer(void)
165{
166 mutex_unlock(&buffer_mutex);
167}
168
169static 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
198static 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
213static 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
224static struct calling_interface_buffer *
225dell_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
284static 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
305out:
306 release_buffer();
307 return ret;
308}
309
310static 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
327static const struct rfkill_ops dell_rfkill_ops = {
328 .set_block = dell_rfkill_set,
329 .query = dell_rfkill_query,
330};
331
332static struct dentry *dell_laptop_dir;
333
334static 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
388static int dell_debugfs_open(struct inode *inode, struct file *file)
389{
390 return single_open(file, dell_debugfs_show, inode->i_private);
391}
392
393static 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
401static 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}
410static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
411
412
413static 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;
473err_wwan:
474 rfkill_destroy(wwan_rfkill);
475 if (bluetooth_rfkill)
476 rfkill_unregister(bluetooth_rfkill);
477err_bluetooth:
478 rfkill_destroy(bluetooth_rfkill);
479 if (wifi_rfkill)
480 rfkill_unregister(wifi_rfkill);
481err_wifi:
482 rfkill_destroy(wifi_rfkill);
483
484 return ret;
485}
486
487static 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
503static 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
521out:
522 release_buffer();
523 return 0;
524}
525
526static 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
545out:
546 release_buffer();
547 return ret;
548}
549
550static const struct backlight_ops dell_ops = {
551 .get_brightness = dell_get_intensity,
552 .update_status = dell_send_intensity,
553};
554
555static 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
579static 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
674fail_backlight:
675 i8042_remove_filter(dell_laptop_i8042_filter);
676 cancel_delayed_work_sync(&dell_rfkill_work);
677fail_filter:
678 dell_cleanup_rfkill();
679fail_rfkill:
680 free_page((unsigned long)bufferpage);
681fail_buffer:
682 platform_device_del(platform_device);
683fail_platform_device2:
684 platform_device_put(platform_device);
685fail_platform_device1:
686 platform_driver_unregister(&platform_driver);
687fail_platform_driver:
688 kfree(da_tokens);
689 return ret;
690}
691
692static 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
707module_init(dell_init);
708module_exit(dell_exit);
709
710MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
711MODULE_DESCRIPTION("Dell laptop driver");
712MODULE_LICENSE("GPL");
713MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");
714MODULE_ALIAS("dmi:*svnDellInc.:*:ct9:*");
715MODULE_ALIAS("dmi:*svnDellComputerCorporation.:*:ct8:*");