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 "../../firmware/dcdbas.h"
29 #define BRIGHTNESS_TOKEN 0x7d
31 /* This structure will be modified by the firmware when we enter
32 * system management mode, hence the volatiles */
34 struct calling_interface_buffer {
37 volatile u32 input[4];
38 volatile u32 output[4];
41 struct calling_interface_token {
50 struct calling_interface_structure {
51 struct dmi_header header;
55 struct calling_interface_token tokens[];
58 static int da_command_address;
59 static int da_command_code;
60 static int da_num_tokens;
61 static struct calling_interface_token *da_tokens;
63 static struct platform_driver platform_driver = {
65 .name = "dell-laptop",
70 static struct platform_device *platform_device;
71 static struct backlight_device *dell_backlight_device;
72 static struct rfkill *wifi_rfkill;
73 static struct rfkill *bluetooth_rfkill;
74 static struct rfkill *wwan_rfkill;
76 static const struct dmi_system_id __initdata dell_device_table[] = {
78 .ident = "Dell laptop",
80 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
81 DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
85 .ident = "Dell Computer Corporation",
87 DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
88 DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
94 static struct dmi_system_id __devinitdata dell_blacklist[] = {
95 /* Supported by compal-laptop */
97 .ident = "Dell Mini 9",
99 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
100 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 910"),
104 .ident = "Dell Mini 10",
106 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
107 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1010"),
111 .ident = "Dell Mini 10v",
113 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
114 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1011"),
118 .ident = "Dell Inspiron 11z",
120 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
121 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1110"),
125 .ident = "Dell Mini 12",
127 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
128 DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1210"),
134 static struct calling_interface_buffer *buffer;
135 static struct page *bufferpage;
136 static DEFINE_MUTEX(buffer_mutex);
138 static int hwswitch_state;
140 static void get_buffer(void)
142 mutex_lock(&buffer_mutex);
143 memset(buffer, 0, sizeof(struct calling_interface_buffer));
146 static void release_buffer(void)
148 mutex_unlock(&buffer_mutex);
151 static void __init parse_da_table(const struct dmi_header *dm)
153 /* Final token is a terminator, so we don't want to copy it */
154 int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
155 struct calling_interface_structure *table =
156 container_of(dm, struct calling_interface_structure, header);
158 /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
164 da_command_address = table->cmdIOAddress;
165 da_command_code = table->cmdIOCode;
167 da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
168 sizeof(struct calling_interface_token),
174 memcpy(da_tokens+da_num_tokens, table->tokens,
175 sizeof(struct calling_interface_token) * tokens);
177 da_num_tokens += tokens;
180 static void __init find_tokens(const struct dmi_header *dm, void *dummy)
183 case 0xd4: /* Indexed IO */
185 case 0xd5: /* Protected Area Type 1 */
187 case 0xd6: /* Protected Area Type 2 */
189 case 0xda: /* Calling interface */
195 static int find_token_location(int tokenid)
198 for (i = 0; i < da_num_tokens; i++) {
199 if (da_tokens[i].tokenID == tokenid)
200 return da_tokens[i].location;
206 static struct calling_interface_buffer *
207 dell_send_request(struct calling_interface_buffer *buffer, int class,
210 struct smi_cmd command;
212 command.magic = SMI_CMD_MAGIC;
213 command.command_address = da_command_address;
214 command.command_code = da_command_code;
215 command.ebx = virt_to_phys(buffer);
216 command.ecx = 0x42534931;
218 buffer->class = class;
219 buffer->select = select;
221 dcdbas_smi_request(&command);
226 /* Derived from information in DellWirelessCtl.cpp:
227 Class 17, select 11 is radio control. It returns an array of 32-bit values.
229 Input byte 0 = 0: Wireless information
231 result[0]: return code
233 Bit 0: Hardware switch supported
234 Bit 1: Wifi locator supported
235 Bit 2: Wifi is supported
236 Bit 3: Bluetooth is supported
237 Bit 4: WWAN is supported
238 Bit 5: Wireless keyboard supported
240 Bit 8: Wifi is installed
241 Bit 9: Bluetooth is installed
242 Bit 10: WWAN is installed
244 Bit 16: Hardware switch is on
245 Bit 17: Wifi is blocked
246 Bit 18: Bluetooth is blocked
247 Bit 19: WWAN is blocked
249 result[2]: NVRAM size in bytes
250 result[3]: NVRAM format version number
252 Input byte 0 = 2: Wireless switch configuration
253 result[0]: return code
255 Bit 0: Wifi controlled by switch
256 Bit 1: Bluetooth controlled by switch
257 Bit 2: WWAN controlled by switch
259 Bit 7: Wireless switch config locked
260 Bit 8: Wifi locator enabled
262 Bit 15: Wifi locator setting locked
266 static int dell_rfkill_set(void *data, bool blocked)
268 int disable = blocked ? 1 : 0;
269 unsigned long radio = (unsigned long)data;
270 int hwswitch_bit = (unsigned long)data - 1;
274 dell_send_request(buffer, 17, 11);
276 /* If the hardware switch controls this radio, and the hardware
277 switch is disabled, don't allow changing the software state */
278 if ((hwswitch_state & BIT(hwswitch_bit)) &&
279 !(buffer->output[1] & BIT(16))) {
284 buffer->input[0] = (1 | (radio<<8) | (disable << 16));
285 dell_send_request(buffer, 17, 11);
292 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
295 int bit = (unsigned long)data + 16;
296 int hwswitch_bit = (unsigned long)data - 1;
299 dell_send_request(buffer, 17, 11);
300 status = buffer->output[1];
303 rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
305 if (hwswitch_state & (BIT(hwswitch_bit)))
306 rfkill_set_hw_state(rfkill, !(status & BIT(16)));
309 static const struct rfkill_ops dell_rfkill_ops = {
310 .set_block = dell_rfkill_set,
311 .query = dell_rfkill_query,
314 static void dell_update_rfkill(struct work_struct *ignored)
317 dell_rfkill_query(wifi_rfkill, (void *)1);
318 if (bluetooth_rfkill)
319 dell_rfkill_query(bluetooth_rfkill, (void *)2);
321 dell_rfkill_query(wwan_rfkill, (void *)3);
323 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
326 static int __init dell_setup_rfkill(void)
331 if (dmi_check_system(dell_blacklist)) {
332 printk(KERN_INFO "dell-laptop: Blacklisted hardware detected - "
333 "not enabling rfkill\n");
338 dell_send_request(buffer, 17, 11);
339 status = buffer->output[1];
340 buffer->input[0] = 0x2;
341 dell_send_request(buffer, 17, 11);
342 hwswitch_state = buffer->output[1];
345 if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
346 wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
348 &dell_rfkill_ops, (void *) 1);
353 ret = rfkill_register(wifi_rfkill);
358 if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
359 bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
360 &platform_device->dev,
361 RFKILL_TYPE_BLUETOOTH,
362 &dell_rfkill_ops, (void *) 2);
363 if (!bluetooth_rfkill) {
367 ret = rfkill_register(bluetooth_rfkill);
372 if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
373 wwan_rfkill = rfkill_alloc("dell-wwan",
374 &platform_device->dev,
376 &dell_rfkill_ops, (void *) 3);
381 ret = rfkill_register(wwan_rfkill);
388 rfkill_destroy(wwan_rfkill);
389 if (bluetooth_rfkill)
390 rfkill_unregister(bluetooth_rfkill);
392 rfkill_destroy(bluetooth_rfkill);
394 rfkill_unregister(wifi_rfkill);
396 rfkill_destroy(wifi_rfkill);
401 static void dell_cleanup_rfkill(void)
404 rfkill_unregister(wifi_rfkill);
405 rfkill_destroy(wifi_rfkill);
407 if (bluetooth_rfkill) {
408 rfkill_unregister(bluetooth_rfkill);
409 rfkill_destroy(bluetooth_rfkill);
412 rfkill_unregister(wwan_rfkill);
413 rfkill_destroy(wwan_rfkill);
417 static int dell_send_intensity(struct backlight_device *bd)
422 buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
423 buffer->input[1] = bd->props.brightness;
425 if (buffer->input[0] == -1) {
430 if (power_supply_is_system_supplied() > 0)
431 dell_send_request(buffer, 1, 2);
433 dell_send_request(buffer, 1, 1);
440 static int dell_get_intensity(struct backlight_device *bd)
445 buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
447 if (buffer->input[0] == -1) {
452 if (power_supply_is_system_supplied() > 0)
453 dell_send_request(buffer, 0, 2);
455 dell_send_request(buffer, 0, 1);
461 return buffer->output[1];
464 static struct backlight_ops dell_ops = {
465 .get_brightness = dell_get_intensity,
466 .update_status = dell_send_intensity,
469 bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
472 static bool extended;
477 if (unlikely(data == 0xe0)) {
480 } else if (unlikely(extended)) {
483 schedule_delayed_work(&dell_rfkill_work,
484 round_jiffies_relative(HZ));
493 static int __init dell_init(void)
495 int max_intensity = 0;
498 if (!dmi_check_system(dell_device_table))
501 dmi_walk(find_tokens, NULL);
504 printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
508 ret = platform_driver_register(&platform_driver);
510 goto fail_platform_driver;
511 platform_device = platform_device_alloc("dell-laptop", -1);
512 if (!platform_device) {
514 goto fail_platform_device1;
516 ret = platform_device_add(platform_device);
518 goto fail_platform_device2;
521 * Allocate buffer below 4GB for SMI data--only 32-bit physical addr
522 * is passed to SMI handler.
524 bufferpage = alloc_page(GFP_KERNEL | GFP_DMA32);
528 buffer = page_address(bufferpage);
529 mutex_init(&buffer_mutex);
531 ret = dell_setup_rfkill();
534 printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
538 ret = i8042_install_filter(dell_laptop_i8042_filter);
541 "dell-laptop: Unable to install key filter\n");
546 /* In the event of an ACPI backlight being available, don't
547 * register the platform controller.
549 if (acpi_video_backlight_support())
554 buffer->input[0] = find_token_location(BRIGHTNESS_TOKEN);
555 if (buffer->input[0] != -1) {
556 dell_send_request(buffer, 0, 2);
557 max_intensity = buffer->output[3];
562 struct backlight_properties props;
563 memset(&props, 0, sizeof(struct backlight_properties));
564 props.max_brightness = max_intensity;
565 dell_backlight_device = backlight_device_register("dell_backlight",
566 &platform_device->dev,
571 if (IS_ERR(dell_backlight_device)) {
572 ret = PTR_ERR(dell_backlight_device);
573 dell_backlight_device = NULL;
577 dell_backlight_device->props.brightness =
578 dell_get_intensity(dell_backlight_device);
579 backlight_update_status(dell_backlight_device);
585 i8042_remove_filter(dell_laptop_i8042_filter);
586 cancel_delayed_work_sync(&dell_rfkill_work);
588 dell_cleanup_rfkill();
590 free_page((unsigned long)bufferpage);
592 platform_device_del(platform_device);
593 fail_platform_device2:
594 platform_device_put(platform_device);
595 fail_platform_device1:
596 platform_driver_unregister(&platform_driver);
597 fail_platform_driver:
602 static void __exit dell_exit(void)
604 i8042_remove_filter(dell_laptop_i8042_filter);
605 cancel_delayed_work_sync(&dell_rfkill_work);
606 backlight_device_unregister(dell_backlight_device);
607 dell_cleanup_rfkill();
608 if (platform_device) {
609 platform_device_unregister(platform_device);
610 platform_driver_unregister(&platform_driver);
613 free_page((unsigned long)buffer);
616 module_init(dell_init);
617 module_exit(dell_exit);
619 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
620 MODULE_DESCRIPTION("Dell laptop driver");
621 MODULE_LICENSE("GPL");
622 MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");
623 MODULE_ALIAS("dmi:*svnDellComputerCorporation.:*:ct8:*");