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>
25 #include "../../firmware/dcdbas.h"
27 #define BRIGHTNESS_TOKEN 0x7d
29 /* This structure will be modified by the firmware when we enter
30 * system management mode, hence the volatiles */
32 struct calling_interface_buffer {
35 volatile u32 input[4];
36 volatile u32 output[4];
39 struct calling_interface_token {
48 struct calling_interface_structure {
49 struct dmi_header header;
53 struct calling_interface_token tokens[];
56 static int da_command_address;
57 static int da_command_code;
58 static int da_num_tokens;
59 static struct calling_interface_token *da_tokens;
61 static struct backlight_device *dell_backlight_device;
62 static struct rfkill *wifi_rfkill;
63 static struct rfkill *bluetooth_rfkill;
64 static struct rfkill *wwan_rfkill;
66 static const struct dmi_system_id __initdata dell_device_table[] = {
68 .ident = "Dell laptop",
70 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
71 DMI_MATCH(DMI_CHASSIS_TYPE, "8"),
77 static void parse_da_table(const struct dmi_header *dm)
79 /* Final token is a terminator, so we don't want to copy it */
80 int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
81 struct calling_interface_structure *table =
82 container_of(dm, struct calling_interface_structure, header);
84 /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least
90 da_command_address = table->cmdIOAddress;
91 da_command_code = table->cmdIOCode;
93 da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
94 sizeof(struct calling_interface_token),
100 memcpy(da_tokens+da_num_tokens, table->tokens,
101 sizeof(struct calling_interface_token) * tokens);
103 da_num_tokens += tokens;
106 static void find_tokens(const struct dmi_header *dm, void *dummy)
109 case 0xd4: /* Indexed IO */
111 case 0xd5: /* Protected Area Type 1 */
113 case 0xd6: /* Protected Area Type 2 */
115 case 0xda: /* Calling interface */
121 static int find_token_location(int tokenid)
124 for (i = 0; i < da_num_tokens; i++) {
125 if (da_tokens[i].tokenID == tokenid)
126 return da_tokens[i].location;
132 static struct calling_interface_buffer *
133 dell_send_request(struct calling_interface_buffer *buffer, int class,
136 struct smi_cmd command;
138 command.magic = SMI_CMD_MAGIC;
139 command.command_address = da_command_address;
140 command.command_code = da_command_code;
141 command.ebx = virt_to_phys(buffer);
142 command.ecx = 0x42534931;
144 buffer->class = class;
145 buffer->select = select;
147 dcdbas_smi_request(&command);
152 /* Derived from information in DellWirelessCtl.cpp:
153 Class 17, select 11 is radio control. It returns an array of 32-bit values.
155 result[0]: return code
157 Bit 0: Hardware switch supported
158 Bit 1: Wifi locator supported
159 Bit 2: Wifi is supported
160 Bit 3: Bluetooth is supported
161 Bit 4: WWAN is supported
162 Bit 5: Wireless keyboard supported
164 Bit 8: Wifi is installed
165 Bit 9: Bluetooth is installed
166 Bit 10: WWAN is installed
168 Bit 16: Hardware switch is on
169 Bit 17: Wifi is blocked
170 Bit 18: Bluetooth is blocked
171 Bit 19: WWAN is blocked
173 result[2]: NVRAM size in bytes
174 result[3]: NVRAM format version number
177 static int dell_rfkill_set(void *data, bool blocked)
179 struct calling_interface_buffer buffer;
180 int disable = blocked ? 0 : 1;
181 unsigned long radio = (unsigned long)data;
183 memset(&buffer, 0, sizeof(struct calling_interface_buffer));
184 buffer.input[0] = (1 | (radio<<8) | (disable << 16));
185 dell_send_request(&buffer, 17, 11);
190 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
192 struct calling_interface_buffer buffer;
194 int bit = (unsigned long)data + 16;
196 memset(&buffer, 0, sizeof(struct calling_interface_buffer));
197 dell_send_request(&buffer, 17, 11);
198 status = buffer.output[1];
200 if (status & BIT(bit))
201 rfkill_set_hw_state(rfkill, !!(status & BIT(16)));
204 static const struct rfkill_ops dell_rfkill_ops = {
205 .set_block = dell_rfkill_set,
206 .query = dell_rfkill_query,
209 static int dell_setup_rfkill(void)
211 struct calling_interface_buffer buffer;
215 memset(&buffer, 0, sizeof(struct calling_interface_buffer));
216 dell_send_request(&buffer, 17, 11);
217 status = buffer.output[1];
219 if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
220 wifi_rfkill = rfkill_alloc("dell-wifi", NULL, RFKILL_TYPE_WLAN,
221 &dell_rfkill_ops, (void *) 1);
226 ret = rfkill_register(wifi_rfkill);
231 if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
232 bluetooth_rfkill = rfkill_alloc("dell-bluetooth", NULL,
233 RFKILL_TYPE_BLUETOOTH,
234 &dell_rfkill_ops, (void *) 2);
235 if (!bluetooth_rfkill) {
239 ret = rfkill_register(bluetooth_rfkill);
244 if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
245 wwan_rfkill = rfkill_alloc("dell-wwan", NULL, RFKILL_TYPE_WWAN,
246 &dell_rfkill_ops, (void *) 3);
251 ret = rfkill_register(wwan_rfkill);
258 rfkill_destroy(wwan_rfkill);
259 if (bluetooth_rfkill)
260 rfkill_unregister(bluetooth_rfkill);
262 rfkill_destroy(bluetooth_rfkill);
264 rfkill_unregister(wifi_rfkill);
266 rfkill_destroy(wifi_rfkill);
271 static int dell_send_intensity(struct backlight_device *bd)
273 struct calling_interface_buffer buffer;
275 memset(&buffer, 0, sizeof(struct calling_interface_buffer));
276 buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
277 buffer.input[1] = bd->props.brightness;
279 if (buffer.input[0] == -1)
282 if (power_supply_is_system_supplied() > 0)
283 dell_send_request(&buffer, 1, 2);
285 dell_send_request(&buffer, 1, 1);
290 static int dell_get_intensity(struct backlight_device *bd)
292 struct calling_interface_buffer buffer;
294 memset(&buffer, 0, sizeof(struct calling_interface_buffer));
295 buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
297 if (buffer.input[0] == -1)
300 if (power_supply_is_system_supplied() > 0)
301 dell_send_request(&buffer, 0, 2);
303 dell_send_request(&buffer, 0, 1);
305 return buffer.output[1];
308 static struct backlight_ops dell_ops = {
309 .get_brightness = dell_get_intensity,
310 .update_status = dell_send_intensity,
313 static int __init dell_init(void)
315 struct calling_interface_buffer buffer;
316 int max_intensity = 0;
319 if (!dmi_check_system(dell_device_table))
322 dmi_walk(find_tokens, NULL);
325 printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n");
329 ret = dell_setup_rfkill();
332 printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n");
337 /* In the event of an ACPI backlight being available, don't
338 * register the platform controller.
340 if (acpi_video_backlight_support())
344 memset(&buffer, 0, sizeof(struct calling_interface_buffer));
345 buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN);
347 if (buffer.input[0] != -1) {
348 dell_send_request(&buffer, 0, 2);
349 max_intensity = buffer.output[3];
353 dell_backlight_device = backlight_device_register(
358 if (IS_ERR(dell_backlight_device)) {
359 ret = PTR_ERR(dell_backlight_device);
360 dell_backlight_device = NULL;
364 dell_backlight_device->props.max_brightness = max_intensity;
365 dell_backlight_device->props.brightness =
366 dell_get_intensity(dell_backlight_device);
367 backlight_update_status(dell_backlight_device);
373 rfkill_unregister(wifi_rfkill);
374 if (bluetooth_rfkill)
375 rfkill_unregister(bluetooth_rfkill);
377 rfkill_unregister(wwan_rfkill);
382 static void __exit dell_exit(void)
384 backlight_device_unregister(dell_backlight_device);
386 rfkill_unregister(wifi_rfkill);
387 if (bluetooth_rfkill)
388 rfkill_unregister(bluetooth_rfkill);
390 rfkill_unregister(wwan_rfkill);
393 module_init(dell_init);
394 module_exit(dell_exit);
396 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
397 MODULE_DESCRIPTION("Dell laptop driver");
398 MODULE_LICENSE("GPL");
399 MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");