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
)
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(int radio
, enum rfkill_state state
)
179 struct calling_interface_buffer buffer
;
180 int disable
= (state
== RFKILL_STATE_UNBLOCKED
) ? 0 : 1;
182 memset(&buffer
, 0, sizeof(struct calling_interface_buffer
));
183 buffer
.input
[0] = (1 | (radio
<<8) | (disable
<< 16));
184 dell_send_request(&buffer
, 17, 11);
189 static int dell_wifi_set(void *data
, enum rfkill_state state
)
191 return dell_rfkill_set(1, state
);
194 static int dell_bluetooth_set(void *data
, enum rfkill_state state
)
196 return dell_rfkill_set(2, state
);
199 static int dell_wwan_set(void *data
, enum rfkill_state state
)
201 return dell_rfkill_set(3, state
);
204 static int dell_rfkill_get(int bit
, enum rfkill_state
*state
)
206 struct calling_interface_buffer buffer
;
208 int new_state
= RFKILL_STATE_HARD_BLOCKED
;
210 memset(&buffer
, 0, sizeof(struct calling_interface_buffer
));
211 dell_send_request(&buffer
, 17, 11);
212 status
= buffer
.output
[1];
214 if (status
& (1<<16))
215 new_state
= RFKILL_STATE_SOFT_BLOCKED
;
217 if (status
& (1<<bit
))
220 *state
= RFKILL_STATE_UNBLOCKED
;
225 static int dell_wifi_get(void *data
, enum rfkill_state
*state
)
227 return dell_rfkill_get(17, state
);
230 static int dell_bluetooth_get(void *data
, enum rfkill_state
*state
)
232 return dell_rfkill_get(18, state
);
235 static int dell_wwan_get(void *data
, enum rfkill_state
*state
)
237 return dell_rfkill_get(19, state
);
240 static int dell_setup_rfkill(void)
242 struct calling_interface_buffer buffer
;
246 memset(&buffer
, 0, sizeof(struct calling_interface_buffer
));
247 dell_send_request(&buffer
, 17, 11);
248 status
= buffer
.output
[1];
250 if ((status
& (1<<2|1<<8)) == (1<<2|1<<8)) {
251 wifi_rfkill
= rfkill_allocate(NULL
, RFKILL_TYPE_WLAN
);
254 wifi_rfkill
->name
= "dell-wifi";
255 wifi_rfkill
->toggle_radio
= dell_wifi_set
;
256 wifi_rfkill
->get_state
= dell_wifi_get
;
257 ret
= rfkill_register(wifi_rfkill
);
262 if ((status
& (1<<3|1<<9)) == (1<<3|1<<9)) {
263 bluetooth_rfkill
= rfkill_allocate(NULL
, RFKILL_TYPE_BLUETOOTH
);
264 if (!bluetooth_rfkill
)
266 bluetooth_rfkill
->name
= "dell-bluetooth";
267 bluetooth_rfkill
->toggle_radio
= dell_bluetooth_set
;
268 bluetooth_rfkill
->get_state
= dell_bluetooth_get
;
269 ret
= rfkill_register(bluetooth_rfkill
);
274 if ((status
& (1<<4|1<<10)) == (1<<4|1<<10)) {
275 wwan_rfkill
= rfkill_allocate(NULL
, RFKILL_TYPE_WWAN
);
278 wwan_rfkill
->name
= "dell-wwan";
279 wwan_rfkill
->toggle_radio
= dell_wwan_set
;
280 wwan_rfkill
->get_state
= dell_wwan_get
;
281 ret
= rfkill_register(wwan_rfkill
);
289 rfkill_free(wwan_rfkill
);
290 if (bluetooth_rfkill
) {
291 rfkill_unregister(bluetooth_rfkill
);
292 bluetooth_rfkill
= NULL
;
295 if (bluetooth_rfkill
)
296 rfkill_free(bluetooth_rfkill
);
298 rfkill_unregister(wifi_rfkill
);
303 rfkill_free(wifi_rfkill
);
308 static int dell_send_intensity(struct backlight_device
*bd
)
310 struct calling_interface_buffer buffer
;
312 memset(&buffer
, 0, sizeof(struct calling_interface_buffer
));
313 buffer
.input
[0] = find_token_location(BRIGHTNESS_TOKEN
);
314 buffer
.input
[1] = bd
->props
.brightness
;
316 if (buffer
.input
[0] == -1)
319 if (power_supply_is_system_supplied() > 0)
320 dell_send_request(&buffer
, 1, 2);
322 dell_send_request(&buffer
, 1, 1);
327 static int dell_get_intensity(struct backlight_device
*bd
)
329 struct calling_interface_buffer buffer
;
331 memset(&buffer
, 0, sizeof(struct calling_interface_buffer
));
332 buffer
.input
[0] = find_token_location(BRIGHTNESS_TOKEN
);
334 if (buffer
.input
[0] == -1)
337 if (power_supply_is_system_supplied() > 0)
338 dell_send_request(&buffer
, 0, 2);
340 dell_send_request(&buffer
, 0, 1);
342 return buffer
.output
[1];
345 static struct backlight_ops dell_ops
= {
346 .get_brightness
= dell_get_intensity
,
347 .update_status
= dell_send_intensity
,
350 static int __init
dell_init(void)
352 struct calling_interface_buffer buffer
;
353 int max_intensity
= 0;
356 if (!dmi_check_system(dell_device_table
))
359 dmi_walk(find_tokens
);
362 printk(KERN_INFO
"dell-laptop: Unable to find dmi tokens\n");
366 ret
= dell_setup_rfkill();
369 printk(KERN_WARNING
"dell-laptop: Unable to setup rfkill\n");
374 /* In the event of an ACPI backlight being available, don't
375 * register the platform controller.
377 if (acpi_video_backlight_support())
381 memset(&buffer
, 0, sizeof(struct calling_interface_buffer
));
382 buffer
.input
[0] = find_token_location(BRIGHTNESS_TOKEN
);
384 if (buffer
.input
[0] != -1) {
385 dell_send_request(&buffer
, 0, 2);
386 max_intensity
= buffer
.output
[3];
390 dell_backlight_device
= backlight_device_register(
395 if (IS_ERR(dell_backlight_device
)) {
396 ret
= PTR_ERR(dell_backlight_device
);
397 dell_backlight_device
= NULL
;
401 dell_backlight_device
->props
.max_brightness
= max_intensity
;
402 dell_backlight_device
->props
.brightness
=
403 dell_get_intensity(dell_backlight_device
);
404 backlight_update_status(dell_backlight_device
);
410 rfkill_unregister(wifi_rfkill
);
411 if (bluetooth_rfkill
)
412 rfkill_unregister(bluetooth_rfkill
);
414 rfkill_unregister(wwan_rfkill
);
419 static void __exit
dell_exit(void)
421 backlight_device_unregister(dell_backlight_device
);
423 rfkill_unregister(wifi_rfkill
);
424 if (bluetooth_rfkill
)
425 rfkill_unregister(bluetooth_rfkill
);
427 rfkill_unregister(wwan_rfkill
);
430 module_init(dell_init
);
431 module_exit(dell_exit
);
433 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
434 MODULE_DESCRIPTION("Dell laptop driver");
435 MODULE_LICENSE("GPL");
436 MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*");