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
dmi_matched(const struct dmi_system_id * dmi)73 static int 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
97 static const struct dmi_system_id __initdata dell_device_table[] = {
98 {
99 .ident = "Dell laptop",
100 .matches = {
101 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
102 DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
103 },
104 },
105 {
106 .matches = {
107 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
108 DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
109 },
110 },
111 {
112 .ident = "Dell Computer Corporation",
113 .matches = {
114 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
115 DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
116 },
117 },
118 { }
119 };
120
121 static struct dmi_system_id __devinitdata dell_blacklist[] = {
122 /* Supported by compal-laptop */
123 {
124 .ident = "Dell Mini 9",
125 .matches = {
126 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
127 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 910"),
128 },
129 },
130 {
131 .ident = "Dell Mini 10",
132 .matches = {
133 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
134 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1010"),
135 },
136 },
137 {
138 .ident = "Dell Mini 10v",
139 .matches = {
140 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
141 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1011"),
142 },
143 },
144 {
145 .ident = "Dell Mini 1012",
146 .matches = {
147 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
148 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
149 },
150 },
151 {
152 .ident = "Dell Inspiron 11z",
153 .matches = {
154 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
155 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1110"),
156 },
157 },
158 {
159 .ident = "Dell Mini 12",
160 .matches = {
161 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
162 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1210"),
163 },
164 },
165 {}
166 };
167
168 static struct dmi_system_id __devinitdata dell_quirks[] = {
169 {
170 .callback = dmi_matched,
171 .ident = "Dell Vostro V130",
172 .matches = {
173 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
174 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V130"),
175 },
176 .driver_data = &quirk_dell_vostro_v130,
177 },
178 {
179 .callback = dmi_matched,
180 .ident = "Dell Vostro V131",
181 .matches = {
182 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
183 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
184 },
185 .driver_data = &quirk_dell_vostro_v130,
186 },
187 };
188
189 static struct calling_interface_buffer *buffer;
190 static struct page *bufferpage;
191 static DEFINE_MUTEX(buffer_mutex);
192
193 static int hwswitch_state;
194
get_buffer(void)195 static void get_buffer(void)
196 {
197 mutex_lock(&buffer_mutex);
198 memset(buffer, 0, sizeof(struct calling_interface_buffer));
199 }
200
release_buffer(void)201 static void release_buffer(void)
202 {
203 mutex_unlock(&buffer_mutex);
204 }
205
parse_da_table(const struct dmi_header * dm)206 static void __init parse_da_table(const struct dmi_header *dm)
207 {
208 /* Final token is a terminator, so we don't want to copy it */
209 int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
210 struct calling_interface_structure *table =
211 container_of(dm, struct calling_interface_structure, header);
212
213 /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
214 6 bytes of entry */
215
216 if (dm->length < 17)
217 return;
218
219 da_command_address = table->cmdIOAddress;
220 da_command_code = table->cmdIOCode;
221
222 da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
223 sizeof(struct calling_interface_token),
224 GFP_KERNEL);
225
226 if (!da_tokens)
227 return;
228
229 memcpy(da_tokens+da_num_tokens, table->tokens,
230 sizeof(struct calling_interface_token) * tokens);
231
232 da_num_tokens += tokens;
233 }
234
find_tokens(const struct dmi_header * dm,void * dummy)235 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
236 {
237 switch (dm->type) {
238 case 0xd4: /* Indexed IO */
239 break;
240 case 0xd5: /* Protected Area Type 1 */
241 break;
242 case 0xd6: /* Protected Area Type 2 */
243 break;
244 case 0xda: /* Calling interface */
245 parse_da_table(dm);
246 break;
247 }
248 }
249
find_token_location(int tokenid)250 static int find_token_location(int tokenid)
251 {
252 int i;
253 for (i = 0; i < da_num_tokens; i++) {
254 if (da_tokens[i].tokenID == tokenid)
255 return da_tokens[i].location;
256 }
257
258 return -1;
259 }
260
261 static struct calling_interface_buffer *
dell_send_request(struct calling_interface_buffer * buffer,int class,int select)262 dell_send_request(struct calling_interface_buffer *buffer, int class,
263 int select)
264 {
265 struct smi_cmd command;
266
267 command.magic = SMI_CMD_MAGIC;
268 command.command_address = da_command_address;
269 command.command_code = da_command_code;
270 command.ebx = virt_to_phys(buffer);
271 command.ecx = 0x42534931;
272
273 buffer->class = class;
274 buffer->select = select;
275
276 dcdbas_smi_request(&command);
277
278 return buffer;
279 }
280
281 /* Derived from information in DellWirelessCtl.cpp:
282 Class 17, select 11 is radio control. It returns an array of 32-bit values.
283
284 Input byte 0 = 0: Wireless information
285
286 result[0]: return code
287 result[1]:
288 Bit 0: Hardware switch supported
289 Bit 1: Wifi locator supported
290 Bit 2: Wifi is supported
291 Bit 3: Bluetooth is supported
292 Bit 4: WWAN is supported
293 Bit 5: Wireless keyboard supported
294 Bits 6-7: Reserved
295 Bit 8: Wifi is installed
296 Bit 9: Bluetooth is installed
297 Bit 10: WWAN is installed
298 Bits 11-15: Reserved
299 Bit 16: Hardware switch is on
300 Bit 17: Wifi is blocked
301 Bit 18: Bluetooth is blocked
302 Bit 19: WWAN is blocked
303 Bits 20-31: Reserved
304 result[2]: NVRAM size in bytes
305 result[3]: NVRAM format version number
306
307 Input byte 0 = 2: Wireless switch configuration
308 result[0]: return code
309 result[1]:
310 Bit 0: Wifi controlled by switch
311 Bit 1: Bluetooth controlled by switch
312 Bit 2: WWAN controlled by switch
313 Bits 3-6: Reserved
314 Bit 7: Wireless switch config locked
315 Bit 8: Wifi locator enabled
316 Bits 9-14: Reserved
317 Bit 15: Wifi locator setting locked
318 Bits 16-31: Reserved
319 */
320
dell_rfkill_set(void * data,bool blocked)321 static int dell_rfkill_set(void *data, bool blocked)
322 {
323 int disable = blocked ? 1 : 0;
324 unsigned long radio = (unsigned long)data;
325 int hwswitch_bit = (unsigned long)data - 1;
326 int ret = 0;
327
328 get_buffer();
329 dell_send_request(buffer, 17, 11);
330
331 /* If the hardware switch controls this radio, and the hardware
332 switch is disabled, don't allow changing the software state */
333 if ((hwswitch_state & BIT(hwswitch_bit)) &&
334 !(buffer->output[1] & BIT(16))) {
335 ret = -EINVAL;
336 goto out;
337 }
338
339 buffer->input[0] = (1 | (radio<<8) | (disable << 16));
340 dell_send_request(buffer, 17, 11);
341
342 out:
343 release_buffer();
344 return ret;
345 }
346
dell_rfkill_query(struct rfkill * rfkill,void * data)347 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
348 {
349 int status;
350 int bit = (unsigned long)data + 16;
351 int hwswitch_bit = (unsigned long)data - 1;
352
353 get_buffer();
354 dell_send_request(buffer, 17, 11);
355 status = buffer->output[1];
356 release_buffer();
357
358 rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
359
360 if (hwswitch_state & (BIT(hwswitch_bit)))
361 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
362 }
363
364 static const struct rfkill_ops dell_rfkill_ops = {
365 .set_block = dell_rfkill_set,
366 .query = dell_rfkill_query,
367 };
368
369 static struct dentry *dell_laptop_dir;
370
dell_debugfs_show(struct seq_file * s,void * data)371 static int dell_debugfs_show(struct seq_file *s, void *data)
372 {
373 int status;
374
375 get_buffer();
376 dell_send_request(buffer, 17, 11);
377 status = buffer->output[1];
378 release_buffer();
379
380 seq_printf(s, "status:\t0x%X\n", status);
381 seq_printf(s, "Bit 0 : Hardware switch supported: %lu\n",
382 status & BIT(0));
383 seq_printf(s, "Bit 1 : Wifi locator supported: %lu\n",
384 (status & BIT(1)) >> 1);
385 seq_printf(s, "Bit 2 : Wifi is supported: %lu\n",
386 (status & BIT(2)) >> 2);
387 seq_printf(s, "Bit 3 : Bluetooth is supported: %lu\n",
388 (status & BIT(3)) >> 3);
389 seq_printf(s, "Bit 4 : WWAN is supported: %lu\n",
390 (status & BIT(4)) >> 4);
391 seq_printf(s, "Bit 5 : Wireless keyboard supported: %lu\n",
392 (status & BIT(5)) >> 5);
393 seq_printf(s, "Bit 8 : Wifi is installed: %lu\n",
394 (status & BIT(8)) >> 8);
395 seq_printf(s, "Bit 9 : Bluetooth is installed: %lu\n",
396 (status & BIT(9)) >> 9);
397 seq_printf(s, "Bit 10: WWAN is installed: %lu\n",
398 (status & BIT(10)) >> 10);
399 seq_printf(s, "Bit 16: Hardware switch is on: %lu\n",
400 (status & BIT(16)) >> 16);
401 seq_printf(s, "Bit 17: Wifi is blocked: %lu\n",
402 (status & BIT(17)) >> 17);
403 seq_printf(s, "Bit 18: Bluetooth is blocked: %lu\n",
404 (status & BIT(18)) >> 18);
405 seq_printf(s, "Bit 19: WWAN is blocked: %lu\n",
406 (status & BIT(19)) >> 19);
407
408 seq_printf(s, "\nhwswitch_state:\t0x%X\n", hwswitch_state);
409 seq_printf(s, "Bit 0 : Wifi controlled by switch: %lu\n",
410 hwswitch_state & BIT(0));
411 seq_printf(s, "Bit 1 : Bluetooth controlled by switch: %lu\n",
412 (hwswitch_state & BIT(1)) >> 1);
413 seq_printf(s, "Bit 2 : WWAN controlled by switch: %lu\n",
414 (hwswitch_state & BIT(2)) >> 2);
415 seq_printf(s, "Bit 7 : Wireless switch config locked: %lu\n",
416 (hwswitch_state & BIT(7)) >> 7);
417 seq_printf(s, "Bit 8 : Wifi locator enabled: %lu\n",
418 (hwswitch_state & BIT(8)) >> 8);
419 seq_printf(s, "Bit 15: Wifi locator setting locked: %lu\n",
420 (hwswitch_state & BIT(15)) >> 15);
421
422 return 0;
423 }
424
dell_debugfs_open(struct inode * inode,struct file * file)425 static int dell_debugfs_open(struct inode *inode, struct file *file)
426 {
427 return single_open(file, dell_debugfs_show, inode->i_private);
428 }
429
430 static const struct file_operations dell_debugfs_fops = {
431 .owner = THIS_MODULE,
432 .open = dell_debugfs_open,
433 .read = seq_read,
434 .llseek = seq_lseek,
435 .release = single_release,
436 };
437
dell_update_rfkill(struct work_struct * ignored)438 static void dell_update_rfkill(struct work_struct *ignored)
439 {
440 if (wifi_rfkill)
441 dell_rfkill_query(wifi_rfkill, (void *)1);
442 if (bluetooth_rfkill)
443 dell_rfkill_query(bluetooth_rfkill, (void *)2);
444 if (wwan_rfkill)
445 dell_rfkill_query(wwan_rfkill, (void *)3);
446 }
447 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
448
449
dell_setup_rfkill(void)450 static int __init dell_setup_rfkill(void)
451 {
452 int status;
453 int ret;
454
455 if (dmi_check_system(dell_blacklist)) {
456 pr_info("Blacklisted hardware detected - not enabling rfkill\n");
457 return 0;
458 }
459
460 get_buffer();
461 dell_send_request(buffer, 17, 11);
462 status = buffer->output[1];
463 buffer->input[0] = 0x2;
464 dell_send_request(buffer, 17, 11);
465 hwswitch_state = buffer->output[1];
466 release_buffer();
467
468 if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
469 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
470 RFKILL_TYPE_WLAN,
471 &dell_rfkill_ops, (void *) 1);
472 if (!wifi_rfkill) {
473 ret = -ENOMEM;
474 goto err_wifi;
475 }
476 ret = rfkill_register(wifi_rfkill);
477 if (ret)
478 goto err_wifi;
479 }
480
481 if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
482 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
483 &platform_device->dev,
484 RFKILL_TYPE_BLUETOOTH,
485 &dell_rfkill_ops, (void *) 2);
486 if (!bluetooth_rfkill) {
487 ret = -ENOMEM;
488 goto err_bluetooth;
489 }
490 ret = rfkill_register(bluetooth_rfkill);
491 if (ret)
492 goto err_bluetooth;
493 }
494
495 if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
496 wwan_rfkill = rfkill_alloc("dell-wwan",
497 &platform_device->dev,
498 RFKILL_TYPE_WWAN,
499 &dell_rfkill_ops, (void *) 3);
500 if (!wwan_rfkill) {
501 ret = -ENOMEM;
502 goto err_wwan;
503 }
504 ret = rfkill_register(wwan_rfkill);
505 if (ret)
506 goto err_wwan;
507 }
508
509 return 0;
510 err_wwan:
511 rfkill_destroy(wwan_rfkill);
512 if (bluetooth_rfkill)
513 rfkill_unregister(bluetooth_rfkill);
514 err_bluetooth:
515 rfkill_destroy(bluetooth_rfkill);
516 if (wifi_rfkill)
517 rfkill_unregister(wifi_rfkill);
518 err_wifi:
519 rfkill_destroy(wifi_rfkill);
520
521 return ret;
522 }
523
dell_cleanup_rfkill(void)524 static void dell_cleanup_rfkill(void)
525 {
526 if (wifi_rfkill) {
527 rfkill_unregister(wifi_rfkill);
528 rfkill_destroy(wifi_rfkill);
529 }
530 if (bluetooth_rfkill) {
531 rfkill_unregister(bluetooth_rfkill);
532 rfkill_destroy(bluetooth_rfkill);
533 }
534 if (wwan_rfkill) {
535 rfkill_unregister(wwan_rfkill);
536 rfkill_destroy(wwan_rfkill);
537 }
538 }
539
dell_send_intensity(struct backlight_device * bd)540 static int dell_send_intensity(struct backlight_device *bd)
541 {
542 int ret = 0;
543
544 get_buffer();
545 buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
546 buffer->input[1] = bd->props.brightness;
547
548 if (buffer->input[0] == -1) {
549 ret = -ENODEV;
550 goto out;
551 }
552
553 if (power_supply_is_system_supplied() > 0)
554 dell_send_request(buffer, 1, 2);
555 else
556 dell_send_request(buffer, 1, 1);
557
558 out:
559 release_buffer();
560 return 0;
561 }
562
dell_get_intensity(struct backlight_device * bd)563 static int dell_get_intensity(struct backlight_device *bd)
564 {
565 int ret = 0;
566
567 get_buffer();
568 buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
569
570 if (buffer->input[0] == -1) {
571 ret = -ENODEV;
572 goto out;
573 }
574
575 if (power_supply_is_system_supplied() > 0)
576 dell_send_request(buffer, 0, 2);
577 else
578 dell_send_request(buffer, 0, 1);
579
580 ret = buffer->output[1];
581
582 out:
583 release_buffer();
584 return ret;
585 }
586
587 static const struct backlight_ops dell_ops = {
588 .get_brightness = dell_get_intensity,
589 .update_status = dell_send_intensity,
590 };
591
touchpad_led_on(void)592 static void touchpad_led_on(void)
593 {
594 int command = 0x97;
595 char data = 1;
596 i8042_command(&data, command | 1 << 12);
597 }
598
touchpad_led_off(void)599 static void touchpad_led_off(void)
600 {
601 int command = 0x97;
602 char data = 2;
603 i8042_command(&data, command | 1 << 12);
604 }
605
touchpad_led_set(struct led_classdev * led_cdev,enum led_brightness value)606 static void touchpad_led_set(struct led_classdev *led_cdev,
607 enum led_brightness value)
608 {
609 if (value > 0)
610 touchpad_led_on();
611 else
612 touchpad_led_off();
613 }
614
615 static struct led_classdev touchpad_led = {
616 .name = "dell-laptop::touchpad",
617 .brightness_set = touchpad_led_set,
618 };
619
touchpad_led_init(struct device * dev)620 static int __devinit touchpad_led_init(struct device *dev)
621 {
622 return led_classdev_register(dev, &touchpad_led);
623 }
624
touchpad_led_exit(void)625 static void touchpad_led_exit(void)
626 {
627 led_classdev_unregister(&touchpad_led);
628 }
629
dell_laptop_i8042_filter(unsigned char data,unsigned char str,struct serio * port)630 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
631 struct serio *port)
632 {
633 static bool extended;
634
635 if (str & 0x20)
636 return false;
637
638 if (unlikely(data == 0xe0)) {
639 extended = true;
640 return false;
641 } else if (unlikely(extended)) {
642 switch (data) {
643 case 0x8:
644 schedule_delayed_work(&dell_rfkill_work,
645 round_jiffies_relative(HZ));
646 break;
647 }
648 extended = false;
649 }
650
651 return false;
652 }
653
dell_init(void)654 static int __init dell_init(void)
655 {
656 int max_intensity = 0;
657 int ret;
658
659 if (!dmi_check_system(dell_device_table))
660 return -ENODEV;
661
662 quirks = NULL;
663 /* find if this machine support other functions */
664 dmi_check_system(dell_quirks);
665
666 dmi_walk(find_tokens, NULL);
667
668 if (!da_tokens) {
669 pr_info("Unable to find dmi tokens\n");
670 return -ENODEV;
671 }
672
673 ret = platform_driver_register(&platform_driver);
674 if (ret)
675 goto fail_platform_driver;
676 platform_device = platform_device_alloc("dell-laptop", -1);
677 if (!platform_device) {
678 ret = -ENOMEM;
679 goto fail_platform_device1;
680 }
681 ret = platform_device_add(platform_device);
682 if (ret)
683 goto fail_platform_device2;
684
685 /*
686 * Allocate buffer below 4GB for SMI data--only 32-bit physical addr
687 * is passed to SMI handler.
688 */
689 bufferpage = alloc_page(GFP_KERNEL | GFP_DMA32);
690
691 if (!bufferpage)
692 goto fail_buffer;
693 buffer = page_address(bufferpage);
694
695 ret = dell_setup_rfkill();
696
697 if (ret) {
698 pr_warn("Unable to setup rfkill\n");
699 goto fail_rfkill;
700 }
701
702 ret = i8042_install_filter(dell_laptop_i8042_filter);
703 if (ret) {
704 pr_warn("Unable to install key filter\n");
705 goto fail_filter;
706 }
707
708 if (quirks && quirks->touchpad_led)
709 touchpad_led_init(&platform_device->dev);
710
711 dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
712 if (dell_laptop_dir != NULL)
713 debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
714 &dell_debugfs_fops);
715
716 #ifdef CONFIG_ACPI
717 /* In the event of an ACPI backlight being available, don't
718 * register the platform controller.
719 */
720 if (acpi_video_backlight_support())
721 return 0;
722 #endif
723
724 get_buffer();
725 buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
726 if (buffer->input[0] != -1) {
727 dell_send_request(buffer, 0, 2);
728 max_intensity = buffer->output[3];
729 }
730 release_buffer();
731
732 if (max_intensity) {
733 struct backlight_properties props;
734 memset(&props, 0, sizeof(struct backlight_properties));
735 props.type = BACKLIGHT_PLATFORM;
736 props.max_brightness = max_intensity;
737 dell_backlight_device = backlight_device_register("dell_backlight",
738 &platform_device->dev,
739 NULL,
740 &dell_ops,
741 &props);
742
743 if (IS_ERR(dell_backlight_device)) {
744 ret = PTR_ERR(dell_backlight_device);
745 dell_backlight_device = NULL;
746 goto fail_backlight;
747 }
748
749 dell_backlight_device->props.brightness =
750 dell_get_intensity(dell_backlight_device);
751 backlight_update_status(dell_backlight_device);
752 }
753
754 return 0;
755
756 fail_backlight:
757 i8042_remove_filter(dell_laptop_i8042_filter);
758 cancel_delayed_work_sync(&dell_rfkill_work);
759 fail_filter:
760 dell_cleanup_rfkill();
761 fail_rfkill:
762 free_page((unsigned long)bufferpage);
763 fail_buffer:
764 platform_device_del(platform_device);
765 fail_platform_device2:
766 platform_device_put(platform_device);
767 fail_platform_device1:
768 platform_driver_unregister(&platform_driver);
769 fail_platform_driver:
770 kfree(da_tokens);
771 return ret;
772 }
773
dell_exit(void)774 static void __exit dell_exit(void)
775 {
776 debugfs_remove_recursive(dell_laptop_dir);
777 if (quirks && quirks->touchpad_led)
778 touchpad_led_exit();
779 i8042_remove_filter(dell_laptop_i8042_filter);
780 cancel_delayed_work_sync(&dell_rfkill_work);
781 backlight_device_unregister(dell_backlight_device);
782 dell_cleanup_rfkill();
783 if (platform_device) {
784 platform_device_unregister(platform_device);
785 platform_driver_unregister(&platform_driver);
786 }
787 kfree(da_tokens);
788 free_page((unsigned long)buffer);
789 }
790
791 module_init(dell_init);
792 module_exit(dell_exit);
793
794 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
795 MODULE_DESCRIPTION("Dell laptop driver");
796 MODULE_LICENSE("GPL");
797 MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");
798 MODULE_ALIAS("dmi:*svnDellInc.:*:ct9:*");
799 MODULE_ALIAS("dmi:*svnDellComputerCorporation.:*:ct8:*");
800