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 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/platform_device.h>
18 #include <linux/backlight.h>
19 #include <linux/err.h>
20 #include <linux/dmi.h>
22 #include <linux/rfkill.h>
23 #include <linux/power_supply.h>
24 #include <linux/acpi.h>
26 #include <linux/i8042.h>
27 #include <linux/slab.h>
28 #include "../../firmware/dcdbas.h"
30 #define BRIGHTNESS_TOKEN 0x7d
32 /* This structure will be modified by the firmware when we enter
33 * system management mode, hence the volatiles */
35 struct calling_interface_buffer {
38 volatile u32 input[4];
39 volatile u32 output[4];
42 struct calling_interface_token {
51 struct calling_interface_structure {
52 struct dmi_header header;
56 struct calling_interface_token tokens[];
59 static int da_command_address;
60 static int da_command_code;
61 static int da_num_tokens;
62 static struct calling_interface_token *da_tokens;
64 static struct platform_driver platform_driver = {
66 .name = "dell-laptop",
71 static struct platform_device *platform_device;
72 static struct backlight_device *dell_backlight_device;
73 static struct rfkill *wifi_rfkill;
74 static struct rfkill *bluetooth_rfkill;
75 static struct rfkill *wwan_rfkill;
77 static const struct dmi_system_id __initdata dell_device_table[] = {
79 .ident = "Dell laptop",
81 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
82 DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
86 .ident = "Dell Computer Corporation",
88 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
89 DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
95 static struct dmi_system_id __devinitdata dell_blacklist[] = {
96 /* Supported by compal-laptop */
98 .ident = "Dell Mini 9",
100 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
101 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 910"),
105 .ident = "Dell Mini 10",
107 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
108 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1010"),
112 .ident = "Dell Mini 10v",
114 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
115 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1011"),
119 .ident = "Dell Inspiron 11z",
121 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
122 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1110"),
126 .ident = "Dell Mini 12",
128 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
129 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1210"),
135 static struct calling_interface_buffer *buffer;
136 static struct page *bufferpage;
137 static DEFINE_MUTEX(buffer_mutex);
139 static int hwswitch_state;
141 static void get_buffer(void)
143 mutex_lock(&buffer_mutex);
144 memset(buffer, 0, sizeof(struct calling_interface_buffer));
147 static void release_buffer(void)
149 mutex_unlock(&buffer_mutex);
152 static void __init parse_da_table(const struct dmi_header *dm)
154 /* Final token is a terminator, so we don't want to copy it */
155 int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
156 struct calling_interface_structure *table =
157 container_of(dm, struct calling_interface_structure, header);
159 /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
165 da_command_address = table->cmdIOAddress;
166 da_command_code = table->cmdIOCode;
168 da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
169 sizeof(struct calling_interface_token),
175 memcpy(da_tokens+da_num_tokens, table->tokens,
176 sizeof(struct calling_interface_token) * tokens);
178 da_num_tokens += tokens;
181 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
184 case 0xd4: /* Indexed IO */
186 case 0xd5: /* Protected Area Type 1 */
188 case 0xd6: /* Protected Area Type 2 */
190 case 0xda: /* Calling interface */
196 static int find_token_location(int tokenid)
199 for (i = 0; i < da_num_tokens; i++) {
200 if (da_tokens[i].tokenID == tokenid)
201 return da_tokens[i].location;
207 static struct calling_interface_buffer *
208 dell_send_request(struct calling_interface_buffer *buffer, int class,
211 struct smi_cmd command;
213 command.magic = SMI_CMD_MAGIC;
214 command.command_address = da_command_address;
215 command.command_code = da_command_code;
216 command.ebx = virt_to_phys(buffer);
217 command.ecx = 0x42534931;
219 buffer->class = class;
220 buffer->select = select;
222 dcdbas_smi_request(&command);
227 /* Derived from information in DellWirelessCtl.cpp:
228 Class 17, select 11 is radio control. It returns an array of 32-bit values.
230 Input byte 0 = 0: Wireless information
232 result[0]: return code
234 Bit 0: Hardware switch supported
235 Bit 1: Wifi locator supported
236 Bit 2: Wifi is supported
237 Bit 3: Bluetooth is supported
238 Bit 4: WWAN is supported
239 Bit 5: Wireless keyboard supported
241 Bit 8: Wifi is installed
242 Bit 9: Bluetooth is installed
243 Bit 10: WWAN is installed
245 Bit 16: Hardware switch is on
246 Bit 17: Wifi is blocked
247 Bit 18: Bluetooth is blocked
248 Bit 19: WWAN is blocked
250 result[2]: NVRAM size in bytes
251 result[3]: NVRAM format version number
253 Input byte 0 = 2: Wireless switch configuration
254 result[0]: return code
256 Bit 0: Wifi controlled by switch
257 Bit 1: Bluetooth controlled by switch
258 Bit 2: WWAN controlled by switch
260 Bit 7: Wireless switch config locked
261 Bit 8: Wifi locator enabled
263 Bit 15: Wifi locator setting locked
267 static int dell_rfkill_set(void *data, bool blocked)
269 int disable = blocked ? 1 : 0;
270 unsigned long radio = (unsigned long)data;
271 int hwswitch_bit = (unsigned long)data - 1;
275 dell_send_request(buffer, 17, 11);
277 /* If the hardware switch controls this radio, and the hardware
278 switch is disabled, don't allow changing the software state */
279 if ((hwswitch_state & BIT(hwswitch_bit)) &&
280 !(buffer->output[1] & BIT(16))) {
285 buffer->input[0] = (1 | (radio<<8) | (disable << 16));
286 dell_send_request(buffer, 17, 11);
293 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
296 int bit = (unsigned long)data + 16;
297 int hwswitch_bit = (unsigned long)data - 1;
300 dell_send_request(buffer, 17, 11);
301 status = buffer->output[1];
304 rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
306 if (hwswitch_state & (BIT(hwswitch_bit)))
307 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
310 static const struct rfkill_ops dell_rfkill_ops = {
311 .set_block = dell_rfkill_set,
312 .query = dell_rfkill_query,
315 static void dell_update_rfkill(struct work_struct *ignored)
318 dell_rfkill_query(wifi_rfkill, (void *)1);
319 if (bluetooth_rfkill)
320 dell_rfkill_query(bluetooth_rfkill, (void *)2);
322 dell_rfkill_query(wwan_rfkill, (void *)3);
324 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
327 static int __init dell_setup_rfkill(void)
332 if (dmi_check_system(dell_blacklist)) {
333 printk(KERN_INFO "dell-laptop: Blacklisted hardware detected - "
334 "not enabling rfkill\n");
339 dell_send_request(buffer, 17, 11);
340 status = buffer->output[1];
341 buffer->input[0] = 0x2;
342 dell_send_request(buffer, 17, 11);
343 hwswitch_state = buffer->output[1];
346 if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
347 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
349 &dell_rfkill_ops, (void *) 1);
354 ret = rfkill_register(wifi_rfkill);
359 if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
360 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
361 &platform_device->dev,
362 RFKILL_TYPE_BLUETOOTH,
363 &dell_rfkill_ops, (void *) 2);
364 if (!bluetooth_rfkill) {
368 ret = rfkill_register(bluetooth_rfkill);
373 if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
374 wwan_rfkill = rfkill_alloc("dell-wwan",
375 &platform_device->dev,
377 &dell_rfkill_ops, (void *) 3);
382 ret = rfkill_register(wwan_rfkill);
389 rfkill_destroy(wwan_rfkill);
390 if (bluetooth_rfkill)
391 rfkill_unregister(bluetooth_rfkill);
393 rfkill_destroy(bluetooth_rfkill);
395 rfkill_unregister(wifi_rfkill);
397 rfkill_destroy(wifi_rfkill);
402 static void dell_cleanup_rfkill(void)
405 rfkill_unregister(wifi_rfkill);
406 rfkill_destroy(wifi_rfkill);
408 if (bluetooth_rfkill) {
409 rfkill_unregister(bluetooth_rfkill);
410 rfkill_destroy(bluetooth_rfkill);
413 rfkill_unregister(wwan_rfkill);
414 rfkill_destroy(wwan_rfkill);
418 static int dell_send_intensity(struct backlight_device *bd)
423 buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
424 buffer->input[1] = bd->props.brightness;
426 if (buffer->input[0] == -1) {
431 if (power_supply_is_system_supplied() > 0)
432 dell_send_request(buffer, 1, 2);
434 dell_send_request(buffer, 1, 1);
441 static int dell_get_intensity(struct backlight_device *bd)
446 buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
448 if (buffer->input[0] == -1) {
453 if (power_supply_is_system_supplied() > 0)
454 dell_send_request(buffer, 0, 2);
456 dell_send_request(buffer, 0, 1);
462 return buffer->output[1];
465 static struct backlight_ops dell_ops = {
466 .get_brightness = dell_get_intensity,
467 .update_status = dell_send_intensity,
470 bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
473 static bool extended;
478 if (unlikely(data == 0xe0)) {
481 } else if (unlikely(extended)) {
484 schedule_delayed_work(&dell_rfkill_work,
485 round_jiffies_relative(HZ));
494 static int __init dell_init(void)
496 int max_intensity = 0;
499 if (!dmi_check_system(dell_device_table))
502 dmi_walk(find_tokens, NULL);
505 printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
509 ret = platform_driver_register(&platform_driver);
511 goto fail_platform_driver;
512 platform_device = platform_device_alloc("dell-laptop", -1);
513 if (!platform_device) {
515 goto fail_platform_device1;
517 ret = platform_device_add(platform_device);
519 goto fail_platform_device2;
522 * Allocate buffer below 4GB for SMI data--only 32-bit physical addr
523 * is passed to SMI handler.
525 bufferpage = alloc_page(GFP_KERNEL | GFP_DMA32);
529 buffer = page_address(bufferpage);
530 mutex_init(&buffer_mutex);
532 ret = dell_setup_rfkill();
535 printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
539 ret = i8042_install_filter(dell_laptop_i8042_filter);
542 "dell-laptop: Unable to install key filter\n");
547 /* In the event of an ACPI backlight being available, don't
548 * register the platform controller.
550 if (acpi_video_backlight_support())
555 buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
556 if (buffer->input[0] != -1) {
557 dell_send_request(buffer, 0, 2);
558 max_intensity = buffer->output[3];
563 struct backlight_properties props;
564 memset(&props, 0, sizeof(struct backlight_properties));
565 props.max_brightness = max_intensity;
566 dell_backlight_device = backlight_device_register("dell_backlight",
567 &platform_device->dev,
572 if (IS_ERR(dell_backlight_device)) {
573 ret = PTR_ERR(dell_backlight_device);
574 dell_backlight_device = NULL;
578 dell_backlight_device->props.brightness =
579 dell_get_intensity(dell_backlight_device);
580 backlight_update_status(dell_backlight_device);
586 i8042_remove_filter(dell_laptop_i8042_filter);
587 cancel_delayed_work_sync(&dell_rfkill_work);
589 dell_cleanup_rfkill();
591 free_page((unsigned long)bufferpage);
593 platform_device_del(platform_device);
594 fail_platform_device2:
595 platform_device_put(platform_device);
596 fail_platform_device1:
597 platform_driver_unregister(&platform_driver);
598 fail_platform_driver:
603 static void __exit dell_exit(void)
605 i8042_remove_filter(dell_laptop_i8042_filter);
606 cancel_delayed_work_sync(&dell_rfkill_work);
607 backlight_device_unregister(dell_backlight_device);
608 dell_cleanup_rfkill();
609 if (platform_device) {
610 platform_device_unregister(platform_device);
611 platform_driver_unregister(&platform_driver);
614 free_page((unsigned long)buffer);
617 module_init(dell_init);
618 module_exit(dell_exit);
620 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
621 MODULE_DESCRIPTION("Dell laptop driver");
622 MODULE_LICENSE("GPL");
623 MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");
624 MODULE_ALIAS("dmi:*svnDellComputerCorporation.:*:ct8:*");