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ad8f07cc MG |
1 | /* |
2 | * Driver for Dell laptop extras | |
3 | * | |
4 | * Copyright (c) Red Hat <mjg@redhat.com> | |
5 | * | |
6 | * Based on documentation in the libsmbios package, Copyright (C) 2005 Dell | |
7 | * Inc. | |
8 | * | |
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. | |
12 | */ | |
13 | ||
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> | |
21 | #include <linux/io.h> | |
22 | #include <linux/rfkill.h> | |
23 | #include <linux/power_supply.h> | |
24 | #include <linux/acpi.h> | |
cad73120 | 25 | #include "../../firmware/dcdbas.h" |
ad8f07cc MG |
26 | |
27 | #define BRIGHTNESS_TOKEN 0x7d | |
28 | ||
29 | /* This structure will be modified by the firmware when we enter | |
30 | * system management mode, hence the volatiles */ | |
31 | ||
32 | struct calling_interface_buffer { | |
33 | u16 class; | |
34 | u16 select; | |
35 | volatile u32 input[4]; | |
36 | volatile u32 output[4]; | |
37 | } __packed; | |
38 | ||
39 | struct calling_interface_token { | |
40 | u16 tokenID; | |
41 | u16 location; | |
42 | union { | |
43 | u16 value; | |
44 | u16 stringlength; | |
45 | }; | |
46 | }; | |
47 | ||
48 | struct calling_interface_structure { | |
49 | struct dmi_header header; | |
50 | u16 cmdIOAddress; | |
51 | u8 cmdIOCode; | |
52 | u32 supportedCmds; | |
53 | struct calling_interface_token tokens[]; | |
54 | } __packed; | |
55 | ||
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; | |
60 | ||
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; | |
65 | ||
66 | static const struct dmi_system_id __initdata dell_device_table[] = { | |
67 | { | |
68 | .ident = "Dell laptop", | |
69 | .matches = { | |
70 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), | |
71 | DMI_MATCH(DMI_CHASSIS_TYPE, "8"), | |
72 | }, | |
73 | }, | |
74 | { } | |
75 | }; | |
76 | ||
77 | static void parse_da_table(const struct dmi_header *dm) | |
78 | { | |
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); | |
83 | ||
84 | /* 4 bytes of table header, plus 7 bytes of Dell header, plus at least | |
85 | 6 bytes of entry */ | |
86 | ||
87 | if (dm->length < 17) | |
88 | return; | |
89 | ||
90 | da_command_address = table->cmdIOAddress; | |
91 | da_command_code = table->cmdIOCode; | |
92 | ||
93 | da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) * | |
94 | sizeof(struct calling_interface_token), | |
95 | GFP_KERNEL); | |
96 | ||
97 | if (!da_tokens) | |
98 | return; | |
99 | ||
100 | memcpy(da_tokens+da_num_tokens, table->tokens, | |
101 | sizeof(struct calling_interface_token) * tokens); | |
102 | ||
103 | da_num_tokens += tokens; | |
104 | } | |
105 | ||
e7a19c56 | 106 | static void find_tokens(const struct dmi_header *dm, void *dummy) |
ad8f07cc MG |
107 | { |
108 | switch (dm->type) { | |
109 | case 0xd4: /* Indexed IO */ | |
110 | break; | |
111 | case 0xd5: /* Protected Area Type 1 */ | |
112 | break; | |
113 | case 0xd6: /* Protected Area Type 2 */ | |
114 | break; | |
115 | case 0xda: /* Calling interface */ | |
116 | parse_da_table(dm); | |
117 | break; | |
118 | } | |
119 | } | |
120 | ||
121 | static int find_token_location(int tokenid) | |
122 | { | |
123 | int i; | |
124 | for (i = 0; i < da_num_tokens; i++) { | |
125 | if (da_tokens[i].tokenID == tokenid) | |
126 | return da_tokens[i].location; | |
127 | } | |
128 | ||
129 | return -1; | |
130 | } | |
131 | ||
132 | static struct calling_interface_buffer * | |
133 | dell_send_request(struct calling_interface_buffer *buffer, int class, | |
134 | int select) | |
135 | { | |
136 | struct smi_cmd command; | |
137 | ||
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; | |
143 | ||
144 | buffer->class = class; | |
145 | buffer->select = select; | |
146 | ||
147 | dcdbas_smi_request(&command); | |
148 | ||
149 | return buffer; | |
150 | } | |
151 | ||
152 | /* Derived from information in DellWirelessCtl.cpp: | |
153 | Class 17, select 11 is radio control. It returns an array of 32-bit values. | |
154 | ||
155 | result[0]: return code | |
156 | result[1]: | |
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 | |
163 | Bits 6-7: Reserved | |
164 | Bit 8: Wifi is installed | |
165 | Bit 9: Bluetooth is installed | |
166 | Bit 10: WWAN is installed | |
167 | Bits 11-15: Reserved | |
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 | |
172 | Bits 20-31: Reserved | |
173 | result[2]: NVRAM size in bytes | |
174 | result[3]: NVRAM format version number | |
175 | */ | |
176 | ||
19d337df | 177 | static int dell_rfkill_set(void *data, bool blocked) |
ad8f07cc MG |
178 | { |
179 | struct calling_interface_buffer buffer; | |
19d337df JB |
180 | int disable = blocked ? 0 : 1; |
181 | unsigned long radio = (unsigned long)data; | |
ad8f07cc MG |
182 | |
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); | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
19d337df | 190 | static void dell_rfkill_query(struct rfkill *rfkill, void *data) |
ad8f07cc MG |
191 | { |
192 | struct calling_interface_buffer buffer; | |
193 | int status; | |
19d337df | 194 | int bit = (unsigned long)data + 16; |
ad8f07cc MG |
195 | |
196 | memset(&buffer, 0, sizeof(struct calling_interface_buffer)); | |
197 | dell_send_request(&buffer, 17, 11); | |
198 | status = buffer.output[1]; | |
199 | ||
19d337df JB |
200 | if (status & BIT(bit)) |
201 | rfkill_set_hw_state(rfkill, !!(status & BIT(16))); | |
ad8f07cc MG |
202 | } |
203 | ||
19d337df JB |
204 | static const struct rfkill_ops dell_rfkill_ops = { |
205 | .set_block = dell_rfkill_set, | |
206 | .query = dell_rfkill_query, | |
207 | }; | |
ad8f07cc MG |
208 | |
209 | static int dell_setup_rfkill(void) | |
210 | { | |
211 | struct calling_interface_buffer buffer; | |
212 | int status; | |
213 | int ret; | |
214 | ||
215 | memset(&buffer, 0, sizeof(struct calling_interface_buffer)); | |
216 | dell_send_request(&buffer, 17, 11); | |
217 | status = buffer.output[1]; | |
218 | ||
219 | if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) { | |
19d337df JB |
220 | wifi_rfkill = rfkill_alloc("dell-wifi", NULL, RFKILL_TYPE_WLAN, |
221 | &dell_rfkill_ops, (void *) 1); | |
222 | if (!wifi_rfkill) { | |
223 | ret = -ENOMEM; | |
ad8f07cc | 224 | goto err_wifi; |
19d337df | 225 | } |
ad8f07cc MG |
226 | ret = rfkill_register(wifi_rfkill); |
227 | if (ret) | |
228 | goto err_wifi; | |
229 | } | |
230 | ||
231 | if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) { | |
19d337df JB |
232 | bluetooth_rfkill = rfkill_alloc("dell-bluetooth", NULL, |
233 | RFKILL_TYPE_BLUETOOTH, | |
234 | &dell_rfkill_ops, (void *) 2); | |
235 | if (!bluetooth_rfkill) { | |
236 | ret = -ENOMEM; | |
ad8f07cc | 237 | goto err_bluetooth; |
19d337df | 238 | } |
ad8f07cc MG |
239 | ret = rfkill_register(bluetooth_rfkill); |
240 | if (ret) | |
241 | goto err_bluetooth; | |
242 | } | |
243 | ||
244 | if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) { | |
19d337df JB |
245 | wwan_rfkill = rfkill_alloc("dell-wwan", NULL, RFKILL_TYPE_WWAN, |
246 | &dell_rfkill_ops, (void *) 3); | |
247 | if (!wwan_rfkill) { | |
248 | ret = -ENOMEM; | |
ad8f07cc | 249 | goto err_wwan; |
19d337df | 250 | } |
ad8f07cc MG |
251 | ret = rfkill_register(wwan_rfkill); |
252 | if (ret) | |
253 | goto err_wwan; | |
254 | } | |
255 | ||
256 | return 0; | |
257 | err_wwan: | |
19d337df JB |
258 | rfkill_destroy(wwan_rfkill); |
259 | if (bluetooth_rfkill) | |
ad8f07cc | 260 | rfkill_unregister(bluetooth_rfkill); |
ad8f07cc | 261 | err_bluetooth: |
19d337df JB |
262 | rfkill_destroy(bluetooth_rfkill); |
263 | if (wifi_rfkill) | |
ad8f07cc | 264 | rfkill_unregister(wifi_rfkill); |
ad8f07cc | 265 | err_wifi: |
19d337df | 266 | rfkill_destroy(wifi_rfkill); |
ad8f07cc MG |
267 | |
268 | return ret; | |
269 | } | |
270 | ||
271 | static int dell_send_intensity(struct backlight_device *bd) | |
272 | { | |
273 | struct calling_interface_buffer buffer; | |
274 | ||
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; | |
278 | ||
279 | if (buffer.input[0] == -1) | |
280 | return -ENODEV; | |
281 | ||
282 | if (power_supply_is_system_supplied() > 0) | |
283 | dell_send_request(&buffer, 1, 2); | |
284 | else | |
285 | dell_send_request(&buffer, 1, 1); | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
290 | static int dell_get_intensity(struct backlight_device *bd) | |
291 | { | |
292 | struct calling_interface_buffer buffer; | |
293 | ||
294 | memset(&buffer, 0, sizeof(struct calling_interface_buffer)); | |
295 | buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN); | |
296 | ||
297 | if (buffer.input[0] == -1) | |
298 | return -ENODEV; | |
299 | ||
300 | if (power_supply_is_system_supplied() > 0) | |
301 | dell_send_request(&buffer, 0, 2); | |
302 | else | |
303 | dell_send_request(&buffer, 0, 1); | |
304 | ||
305 | return buffer.output[1]; | |
306 | } | |
307 | ||
308 | static struct backlight_ops dell_ops = { | |
309 | .get_brightness = dell_get_intensity, | |
310 | .update_status = dell_send_intensity, | |
311 | }; | |
312 | ||
313 | static int __init dell_init(void) | |
314 | { | |
315 | struct calling_interface_buffer buffer; | |
316 | int max_intensity = 0; | |
317 | int ret; | |
318 | ||
319 | if (!dmi_check_system(dell_device_table)) | |
320 | return -ENODEV; | |
321 | ||
e7a19c56 | 322 | dmi_walk(find_tokens, NULL); |
ad8f07cc MG |
323 | |
324 | if (!da_tokens) { | |
325 | printk(KERN_INFO "dell-laptop: Unable to find dmi tokens\n"); | |
326 | return -ENODEV; | |
327 | } | |
328 | ||
329 | ret = dell_setup_rfkill(); | |
330 | ||
331 | if (ret) { | |
332 | printk(KERN_WARNING "dell-laptop: Unable to setup rfkill\n"); | |
333 | goto out; | |
334 | } | |
335 | ||
336 | #ifdef CONFIG_ACPI | |
337 | /* In the event of an ACPI backlight being available, don't | |
338 | * register the platform controller. | |
339 | */ | |
340 | if (acpi_video_backlight_support()) | |
341 | return 0; | |
342 | #endif | |
343 | ||
344 | memset(&buffer, 0, sizeof(struct calling_interface_buffer)); | |
345 | buffer.input[0] = find_token_location(BRIGHTNESS_TOKEN); | |
346 | ||
347 | if (buffer.input[0] != -1) { | |
348 | dell_send_request(&buffer, 0, 2); | |
349 | max_intensity = buffer.output[3]; | |
350 | } | |
351 | ||
352 | if (max_intensity) { | |
353 | dell_backlight_device = backlight_device_register( | |
354 | "dell_backlight", | |
355 | NULL, NULL, | |
356 | &dell_ops); | |
357 | ||
358 | if (IS_ERR(dell_backlight_device)) { | |
359 | ret = PTR_ERR(dell_backlight_device); | |
360 | dell_backlight_device = NULL; | |
361 | goto out; | |
362 | } | |
363 | ||
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); | |
368 | } | |
369 | ||
370 | return 0; | |
371 | out: | |
372 | if (wifi_rfkill) | |
373 | rfkill_unregister(wifi_rfkill); | |
374 | if (bluetooth_rfkill) | |
375 | rfkill_unregister(bluetooth_rfkill); | |
376 | if (wwan_rfkill) | |
377 | rfkill_unregister(wwan_rfkill); | |
378 | kfree(da_tokens); | |
379 | return ret; | |
380 | } | |
381 | ||
382 | static void __exit dell_exit(void) | |
383 | { | |
384 | backlight_device_unregister(dell_backlight_device); | |
385 | if (wifi_rfkill) | |
386 | rfkill_unregister(wifi_rfkill); | |
387 | if (bluetooth_rfkill) | |
388 | rfkill_unregister(bluetooth_rfkill); | |
389 | if (wwan_rfkill) | |
390 | rfkill_unregister(wwan_rfkill); | |
391 | } | |
392 | ||
393 | module_init(dell_init); | |
394 | module_exit(dell_exit); | |
395 | ||
396 | MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); | |
397 | MODULE_DESCRIPTION("Dell laptop driver"); | |
398 | MODULE_LICENSE("GPL"); | |
399 | MODULE_ALIAS("dmi:*svnDellInc.:*:ct8:*"); |