1 /*
2 * intel_oaktrail.c - Intel OakTrail Platform support.
3 *
4 * Copyright (C) 2010-2011 Intel Corporation
5 * Author: Yin Kangkai (kangkai.yin@intel.com)
6 *
7 * based on Compal driver, Copyright (C) 2008 Cezary Jackiewicz
8 * <cezary.jackiewicz (at) gmail.com>, based on MSI driver
9 * Copyright (C) 2006 Lennart Poettering <mzxreary (at) 0pointer (dot) de>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
24 * 02110-1301, USA.
25 *
26 * This driver does below things:
27 * 1. registers itself in the Linux backlight control in
28 * /sys/class/backlight/intel_oaktrail/
29 *
30 * 2. registers in the rfkill subsystem here: /sys/class/rfkill/rfkillX/
31 * for these components: wifi, bluetooth, wwan (3g), gps
32 *
33 * This driver might work on other products based on Oaktrail. If you
34 * want to try it you can pass force=1 as argument to the module which
35 * will force it to load even when the DMI data doesn't identify the
36 * product as compatible.
37 */
38
39 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
40
41 #include <linux/module.h>
42 #include <linux/kernel.h>
43 #include <linux/init.h>
44 #include <linux/acpi.h>
45 #include <linux/fb.h>
46 #include <linux/mutex.h>
47 #include <linux/err.h>
48 #include <linux/i2c.h>
49 #include <linux/backlight.h>
50 #include <linux/platform_device.h>
51 #include <linux/dmi.h>
52 #include <linux/rfkill.h>
53 #include <acpi/video.h>
54
55 #define DRIVER_NAME "intel_oaktrail"
56 #define DRIVER_VERSION "0.4ac1"
57
58 /*
59 * This is the devices status address in EC space, and the control bits
60 * definition:
61 *
62 * (1 << 0): Camera enable/disable, RW.
63 * (1 << 1): Bluetooth enable/disable, RW.
64 * (1 << 2): GPS enable/disable, RW.
65 * (1 << 3): WiFi enable/disable, RW.
66 * (1 << 4): WWAN (3G) enable/disable, RW.
67 * (1 << 5): Touchscreen enable/disable, Read Only.
68 */
69 #define OT_EC_DEVICE_STATE_ADDRESS 0xD6
70
71 #define OT_EC_CAMERA_MASK (1 << 0)
72 #define OT_EC_BT_MASK (1 << 1)
73 #define OT_EC_GPS_MASK (1 << 2)
74 #define OT_EC_WIFI_MASK (1 << 3)
75 #define OT_EC_WWAN_MASK (1 << 4)
76 #define OT_EC_TS_MASK (1 << 5)
77
78 /*
79 * This is the address in EC space and commands used to control LCD backlight:
80 *
81 * Two steps needed to change the LCD backlight:
82 * 1. write the backlight percentage into OT_EC_BL_BRIGHTNESS_ADDRESS;
83 * 2. write OT_EC_BL_CONTROL_ON_DATA into OT_EC_BL_CONTROL_ADDRESS.
84 *
85 * To read the LCD back light, just read out the value from
86 * OT_EC_BL_BRIGHTNESS_ADDRESS.
87 *
88 * LCD backlight brightness range: 0 - 100 (OT_EC_BL_BRIGHTNESS_MAX)
89 */
90 #define OT_EC_BL_BRIGHTNESS_ADDRESS 0x44
91 #define OT_EC_BL_BRIGHTNESS_MAX 100
92 #define OT_EC_BL_CONTROL_ADDRESS 0x3A
93 #define OT_EC_BL_CONTROL_ON_DATA 0x1A
94
95
96 static bool force;
97 module_param(force, bool, 0);
98 MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
99
100 static struct platform_device *oaktrail_device;
101 static struct backlight_device *oaktrail_bl_device;
102 static struct rfkill *bt_rfkill;
103 static struct rfkill *gps_rfkill;
104 static struct rfkill *wifi_rfkill;
105 static struct rfkill *wwan_rfkill;
106
107
108 /* rfkill */
oaktrail_rfkill_set(void * data,bool blocked)109 static int oaktrail_rfkill_set(void *data, bool blocked)
110 {
111 u8 value;
112 u8 result;
113 unsigned long radio = (unsigned long) data;
114
115 ec_read(OT_EC_DEVICE_STATE_ADDRESS, &result);
116
117 if (!blocked)
118 value = (u8) (result | radio);
119 else
120 value = (u8) (result & ~radio);
121
122 ec_write(OT_EC_DEVICE_STATE_ADDRESS, value);
123
124 return 0;
125 }
126
127 static const struct rfkill_ops oaktrail_rfkill_ops = {
128 .set_block = oaktrail_rfkill_set,
129 };
130
oaktrail_rfkill_new(char * name,enum rfkill_type type,unsigned long mask)131 static struct rfkill *oaktrail_rfkill_new(char *name, enum rfkill_type type,
132 unsigned long mask)
133 {
134 struct rfkill *rfkill_dev;
135 u8 value;
136 int err;
137
138 rfkill_dev = rfkill_alloc(name, &oaktrail_device->dev, type,
139 &oaktrail_rfkill_ops, (void *)mask);
140 if (!rfkill_dev)
141 return ERR_PTR(-ENOMEM);
142
143 ec_read(OT_EC_DEVICE_STATE_ADDRESS, &value);
144 rfkill_init_sw_state(rfkill_dev, (value & mask) != 1);
145
146 err = rfkill_register(rfkill_dev);
147 if (err) {
148 rfkill_destroy(rfkill_dev);
149 return ERR_PTR(err);
150 }
151
152 return rfkill_dev;
153 }
154
__oaktrail_rfkill_cleanup(struct rfkill * rf)155 static inline void __oaktrail_rfkill_cleanup(struct rfkill *rf)
156 {
157 if (rf) {
158 rfkill_unregister(rf);
159 rfkill_destroy(rf);
160 }
161 }
162
oaktrail_rfkill_cleanup(void)163 static void oaktrail_rfkill_cleanup(void)
164 {
165 __oaktrail_rfkill_cleanup(wifi_rfkill);
166 __oaktrail_rfkill_cleanup(bt_rfkill);
167 __oaktrail_rfkill_cleanup(gps_rfkill);
168 __oaktrail_rfkill_cleanup(wwan_rfkill);
169 }
170
oaktrail_rfkill_init(void)171 static int oaktrail_rfkill_init(void)
172 {
173 int ret;
174
175 wifi_rfkill = oaktrail_rfkill_new("oaktrail-wifi",
176 RFKILL_TYPE_WLAN,
177 OT_EC_WIFI_MASK);
178 if (IS_ERR(wifi_rfkill)) {
179 ret = PTR_ERR(wifi_rfkill);
180 wifi_rfkill = NULL;
181 goto cleanup;
182 }
183
184 bt_rfkill = oaktrail_rfkill_new("oaktrail-bluetooth",
185 RFKILL_TYPE_BLUETOOTH,
186 OT_EC_BT_MASK);
187 if (IS_ERR(bt_rfkill)) {
188 ret = PTR_ERR(bt_rfkill);
189 bt_rfkill = NULL;
190 goto cleanup;
191 }
192
193 gps_rfkill = oaktrail_rfkill_new("oaktrail-gps",
194 RFKILL_TYPE_GPS,
195 OT_EC_GPS_MASK);
196 if (IS_ERR(gps_rfkill)) {
197 ret = PTR_ERR(gps_rfkill);
198 gps_rfkill = NULL;
199 goto cleanup;
200 }
201
202 wwan_rfkill = oaktrail_rfkill_new("oaktrail-wwan",
203 RFKILL_TYPE_WWAN,
204 OT_EC_WWAN_MASK);
205 if (IS_ERR(wwan_rfkill)) {
206 ret = PTR_ERR(wwan_rfkill);
207 wwan_rfkill = NULL;
208 goto cleanup;
209 }
210
211 return 0;
212
213 cleanup:
214 oaktrail_rfkill_cleanup();
215 return ret;
216 }
217
218
219 /* backlight */
get_backlight_brightness(struct backlight_device * b)220 static int get_backlight_brightness(struct backlight_device *b)
221 {
222 u8 value;
223 ec_read(OT_EC_BL_BRIGHTNESS_ADDRESS, &value);
224
225 return value;
226 }
227
set_backlight_brightness(struct backlight_device * b)228 static int set_backlight_brightness(struct backlight_device *b)
229 {
230 u8 percent = (u8) b->props.brightness;
231 if (percent < 0 || percent > OT_EC_BL_BRIGHTNESS_MAX)
232 return -EINVAL;
233
234 ec_write(OT_EC_BL_BRIGHTNESS_ADDRESS, percent);
235 ec_write(OT_EC_BL_CONTROL_ADDRESS, OT_EC_BL_CONTROL_ON_DATA);
236
237 return 0;
238 }
239
240 static const struct backlight_ops oaktrail_bl_ops = {
241 .get_brightness = get_backlight_brightness,
242 .update_status = set_backlight_brightness,
243 };
244
oaktrail_backlight_init(void)245 static int oaktrail_backlight_init(void)
246 {
247 struct backlight_device *bd;
248 struct backlight_properties props;
249
250 memset(&props, 0, sizeof(struct backlight_properties));
251 props.type = BACKLIGHT_PLATFORM;
252 props.max_brightness = OT_EC_BL_BRIGHTNESS_MAX;
253 bd = backlight_device_register(DRIVER_NAME,
254 &oaktrail_device->dev, NULL,
255 &oaktrail_bl_ops,
256 &props);
257
258 if (IS_ERR(bd)) {
259 oaktrail_bl_device = NULL;
260 pr_warning("Unable to register backlight device\n");
261 return PTR_ERR(bd);
262 }
263
264 oaktrail_bl_device = bd;
265
266 bd->props.brightness = get_backlight_brightness(bd);
267 bd->props.power = FB_BLANK_UNBLANK;
268 backlight_update_status(bd);
269
270 return 0;
271 }
272
oaktrail_backlight_exit(void)273 static void oaktrail_backlight_exit(void)
274 {
275 backlight_device_unregister(oaktrail_bl_device);
276 }
277
oaktrail_probe(struct platform_device * pdev)278 static int oaktrail_probe(struct platform_device *pdev)
279 {
280 return 0;
281 }
282
oaktrail_remove(struct platform_device * pdev)283 static int oaktrail_remove(struct platform_device *pdev)
284 {
285 return 0;
286 }
287
288 static struct platform_driver oaktrail_driver = {
289 .driver = {
290 .name = DRIVER_NAME,
291 },
292 .probe = oaktrail_probe,
293 .remove = oaktrail_remove,
294 };
295
dmi_check_cb(const struct dmi_system_id * id)296 static int dmi_check_cb(const struct dmi_system_id *id)
297 {
298 pr_info("Identified model '%s'\n", id->ident);
299 return 0;
300 }
301
302 static const struct dmi_system_id oaktrail_dmi_table[] __initconst = {
303 {
304 .ident = "OakTrail platform",
305 .matches = {
306 DMI_MATCH(DMI_PRODUCT_NAME, "OakTrail platform"),
307 },
308 .callback = dmi_check_cb
309 },
310 { }
311 };
312 MODULE_DEVICE_TABLE(dmi, oaktrail_dmi_table);
313
oaktrail_init(void)314 static int __init oaktrail_init(void)
315 {
316 int ret;
317
318 if (acpi_disabled) {
319 pr_err("ACPI needs to be enabled for this driver to work!\n");
320 return -ENODEV;
321 }
322
323 if (!force && !dmi_check_system(oaktrail_dmi_table)) {
324 pr_err("Platform not recognized (You could try the module's force-parameter)");
325 return -ENODEV;
326 }
327
328 ret = platform_driver_register(&oaktrail_driver);
329 if (ret) {
330 pr_warning("Unable to register platform driver\n");
331 goto err_driver_reg;
332 }
333
334 oaktrail_device = platform_device_alloc(DRIVER_NAME, -1);
335 if (!oaktrail_device) {
336 pr_warning("Unable to allocate platform device\n");
337 ret = -ENOMEM;
338 goto err_device_alloc;
339 }
340
341 ret = platform_device_add(oaktrail_device);
342 if (ret) {
343 pr_warning("Unable to add platform device\n");
344 goto err_device_add;
345 }
346
347 if (acpi_video_get_backlight_type() == acpi_backlight_vendor) {
348 ret = oaktrail_backlight_init();
349 if (ret)
350 goto err_backlight;
351 }
352
353 ret = oaktrail_rfkill_init();
354 if (ret) {
355 pr_warning("Setup rfkill failed\n");
356 goto err_rfkill;
357 }
358
359 pr_info("Driver "DRIVER_VERSION" successfully loaded\n");
360 return 0;
361
362 err_rfkill:
363 oaktrail_backlight_exit();
364 err_backlight:
365 platform_device_del(oaktrail_device);
366 err_device_add:
367 platform_device_put(oaktrail_device);
368 err_device_alloc:
369 platform_driver_unregister(&oaktrail_driver);
370 err_driver_reg:
371
372 return ret;
373 }
374
oaktrail_cleanup(void)375 static void __exit oaktrail_cleanup(void)
376 {
377 oaktrail_backlight_exit();
378 oaktrail_rfkill_cleanup();
379 platform_device_unregister(oaktrail_device);
380 platform_driver_unregister(&oaktrail_driver);
381
382 pr_info("Driver unloaded\n");
383 }
384
385 module_init(oaktrail_init);
386 module_exit(oaktrail_cleanup);
387
388 MODULE_AUTHOR("Yin Kangkai (kangkai.yin@intel.com)");
389 MODULE_DESCRIPTION("Intel Oaktrail Platform ACPI Extras");
390 MODULE_VERSION(DRIVER_VERSION);
391 MODULE_LICENSE("GPL");
392