2 * Driver for Dell laptop extras
4 * Copyright (c) Red Hat <mjg@redhat.com>
6 * Based on documentation in the libsmbios package, Copyright (C) 2005 Dell
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.
14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
24 #include <linux/rfkill.h>
25 #include <linux/power_supply.h>
26 #include <linux/acpi.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"
34 #define BRIGHTNESS_TOKEN 0x7d
36 /* This structure will be modified by the firmware when we enter
37 * system management mode, hence the volatiles */
39 struct calling_interface_buffer {
42 volatile u32 input[4];
43 volatile u32 output[4];
46 struct calling_interface_token {
55 struct calling_interface_structure {
56 struct dmi_header header;
60 struct calling_interface_token tokens[];
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;
68 static struct platform_driver platform_driver = {
70 .name = "dell-laptop",
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;
81 static const struct dmi_system_id __initdata dell_device_table[] = {
83 .ident = "Dell laptop",
85 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
86 DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
91 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
92 DMI_MATCH(DMI_CHASSIS_TYPE, "9"), /*Laptop*/
96 .ident = "Dell Computer Corporation",
98 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
99 DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
105 static struct dmi_system_id __devinitdata dell_blacklist[] = {
106 /* Supported by compal-laptop */
108 .ident = "Dell Mini 9",
110 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
111 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 910"),
115 .ident = "Dell Mini 10",
117 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
118 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1010"),
122 .ident = "Dell Mini 10v",
124 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
125 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1011"),
129 .ident = "Dell Mini 1012",
131 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
132 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
136 .ident = "Dell Inspiron 11z",
138 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
139 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1110"),
143 .ident = "Dell Mini 12",
145 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
146 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1210"),
152 static struct calling_interface_buffer *buffer;
153 static struct page *bufferpage;
154 static DEFINE_MUTEX(buffer_mutex);
156 static int hwswitch_state;
158 static void get_buffer(void)
160 mutex_lock(&buffer_mutex);
161 memset(buffer, 0, sizeof(struct calling_interface_buffer));
164 static void release_buffer(void)
166 mutex_unlock(&buffer_mutex);
169 static void __init parse_da_table(const struct dmi_header *dm)
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);
176 /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
182 da_command_address = table->cmdIOAddress;
183 da_command_code = table->cmdIOCode;
185 da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
186 sizeof(struct calling_interface_token),
192 memcpy(da_tokens+da_num_tokens, table->tokens,
193 sizeof(struct calling_interface_token) * tokens);
195 da_num_tokens += tokens;
198 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
201 case 0xd4: /* Indexed IO */
203 case 0xd5: /* Protected Area Type 1 */
205 case 0xd6: /* Protected Area Type 2 */
207 case 0xda: /* Calling interface */
213 static int find_token_location(int tokenid)
216 for (i = 0; i < da_num_tokens; i++) {
217 if (da_tokens[i].tokenID == tokenid)
218 return da_tokens[i].location;
224 static struct calling_interface_buffer *
225 dell_send_request(struct calling_interface_buffer *buffer, int class,
228 struct smi_cmd command;
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;
236 buffer->class = class;
237 buffer->select = select;
239 dcdbas_smi_request(&command);
244 /* Derived from information in DellWirelessCtl.cpp:
245 Class 17, select 11 is radio control. It returns an array of 32-bit values.
247 Input byte 0 = 0: Wireless information
249 result[0]: return code
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
258 Bit 8: Wifi is installed
259 Bit 9: Bluetooth is installed
260 Bit 10: WWAN is installed
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
267 result[2]: NVRAM size in bytes
268 result[3]: NVRAM format version number
270 Input byte 0 = 2: Wireless switch configuration
271 result[0]: return code
273 Bit 0: Wifi controlled by switch
274 Bit 1: Bluetooth controlled by switch
275 Bit 2: WWAN controlled by switch
277 Bit 7: Wireless switch config locked
278 Bit 8: Wifi locator enabled
280 Bit 15: Wifi locator setting locked
284 static int dell_rfkill_set(void *data, bool blocked)
286 int disable = blocked ? 1 : 0;
287 unsigned long radio = (unsigned long)data;
288 int hwswitch_bit = (unsigned long)data - 1;
292 dell_send_request(buffer, 17, 11);
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))) {
302 buffer->input[0] = (1 | (radio<<8) | (disable << 16));
303 dell_send_request(buffer, 17, 11);
310 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
313 int bit = (unsigned long)data + 16;
314 int hwswitch_bit = (unsigned long)data - 1;
317 dell_send_request(buffer, 17, 11);
318 status = buffer->output[1];
321 rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
323 if (hwswitch_state & (BIT(hwswitch_bit)))
324 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
327 static const struct rfkill_ops dell_rfkill_ops = {
328 .set_block = dell_rfkill_set,
329 .query = dell_rfkill_query,
332 static struct dentry *dell_laptop_dir;
334 static int dell_debugfs_show(struct seq_file *s, void *data)
339 dell_send_request(buffer, 17, 11);
340 status = buffer->output[1];
343 seq_printf(s, "status:\t0x%X\n", status);
344 seq_printf(s, "Bit 0 : Hardware switch supported: %lu\n",
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);
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);
388 static int dell_debugfs_open(struct inode *inode, struct file *file)
390 return single_open(file, dell_debugfs_show, inode->i_private);
393 static const struct file_operations dell_debugfs_fops = {
394 .owner = THIS_MODULE,
395 .open = dell_debugfs_open,
398 .release = single_release,
401 static void dell_update_rfkill(struct work_struct *ignored)
404 dell_rfkill_query(wifi_rfkill, (void *)1);
405 if (bluetooth_rfkill)
406 dell_rfkill_query(bluetooth_rfkill, (void *)2);
408 dell_rfkill_query(wwan_rfkill, (void *)3);
410 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
413 static int __init dell_setup_rfkill(void)
418 if (dmi_check_system(dell_blacklist)) {
419 pr_info("Blacklisted hardware detected - not enabling rfkill\n");
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];
431 if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
432 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
434 &dell_rfkill_ops, (void *) 1);
439 ret = rfkill_register(wifi_rfkill);
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) {
453 ret = rfkill_register(bluetooth_rfkill);
458 if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
459 wwan_rfkill = rfkill_alloc("dell-wwan",
460 &platform_device->dev,
462 &dell_rfkill_ops, (void *) 3);
467 ret = rfkill_register(wwan_rfkill);
474 rfkill_destroy(wwan_rfkill);
475 if (bluetooth_rfkill)
476 rfkill_unregister(bluetooth_rfkill);
478 rfkill_destroy(bluetooth_rfkill);
480 rfkill_unregister(wifi_rfkill);
482 rfkill_destroy(wifi_rfkill);
487 static void dell_cleanup_rfkill(void)
490 rfkill_unregister(wifi_rfkill);
491 rfkill_destroy(wifi_rfkill);
493 if (bluetooth_rfkill) {
494 rfkill_unregister(bluetooth_rfkill);
495 rfkill_destroy(bluetooth_rfkill);
498 rfkill_unregister(wwan_rfkill);
499 rfkill_destroy(wwan_rfkill);
503 static int dell_send_intensity(struct backlight_device *bd)
508 buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
509 buffer->input[1] = bd->props.brightness;
511 if (buffer->input[0] == -1) {
516 if (power_supply_is_system_supplied() > 0)
517 dell_send_request(buffer, 1, 2);
519 dell_send_request(buffer, 1, 1);
526 static int dell_get_intensity(struct backlight_device *bd)
531 buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
533 if (buffer->input[0] == -1) {
538 if (power_supply_is_system_supplied() > 0)
539 dell_send_request(buffer, 0, 2);
541 dell_send_request(buffer, 0, 1);
543 ret = buffer->output[1];
550 static const struct backlight_ops dell_ops = {
551 .get_brightness = dell_get_intensity,
552 .update_status = dell_send_intensity,
555 static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
558 static bool extended;
563 if (unlikely(data == 0xe0)) {
566 } else if (unlikely(extended)) {
569 schedule_delayed_work(&dell_rfkill_work,
570 round_jiffies_relative(HZ));
579 static int __init dell_init(void)
581 int max_intensity = 0;
584 if (!dmi_check_system(dell_device_table))
587 dmi_walk(find_tokens, NULL);
590 pr_info("Unable to find dmi tokens\n");
594 ret = platform_driver_register(&platform_driver);
596 goto fail_platform_driver;
597 platform_device = platform_device_alloc("dell-laptop", -1);
598 if (!platform_device) {
600 goto fail_platform_device1;
602 ret = platform_device_add(platform_device);
604 goto fail_platform_device2;
607 * Allocate buffer below 4GB for SMI data--only 32-bit physical addr
608 * is passed to SMI handler.
610 bufferpage = alloc_page(GFP_KERNEL | GFP_DMA32);
614 buffer = page_address(bufferpage);
616 ret = dell_setup_rfkill();
619 pr_warn("Unable to setup rfkill\n");
623 ret = i8042_install_filter(dell_laptop_i8042_filter);
625 pr_warn("Unable to install key filter\n");
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,
635 /* In the event of an ACPI backlight being available, don't
636 * register the platform controller.
638 if (acpi_video_backlight_support())
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];
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,
661 if (IS_ERR(dell_backlight_device)) {
662 ret = PTR_ERR(dell_backlight_device);
663 dell_backlight_device = NULL;
667 dell_backlight_device->props.brightness =
668 dell_get_intensity(dell_backlight_device);
669 backlight_update_status(dell_backlight_device);
675 i8042_remove_filter(dell_laptop_i8042_filter);
676 cancel_delayed_work_sync(&dell_rfkill_work);
678 dell_cleanup_rfkill();
680 free_page((unsigned long)bufferpage);
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:
692 static void __exit dell_exit(void)
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);
704 free_page((unsigned long)buffer);
707 module_init(dell_init);
708 module_exit(dell_exit);
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:*");