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/acpi_bus.h>
54 #include <acpi/acpi_drivers.h>
55
56
57 #define DRIVER_NAME "intel_oaktrail"
58 #define DRIVER_VERSION "0.4ac1"
59
60 /*
61 * This is the devices status address in EC space, and the control bits
62 * definition:
63 *
64 * (1 << 0): Camera enable/disable, RW.
65 * (1 << 1): Bluetooth enable/disable, RW.
66 * (1 << 2): GPS enable/disable, RW.
67 * (1 << 3): WiFi enable/disable, RW.
68 * (1 << 4): WWAN (3G) enable/disalbe, RW.
69 * (1 << 5): Touchscreen enable/disable, Read Only.
70 */
71 #define OT_EC_DEVICE_STATE_ADDRESS 0xD6
72
73 #define OT_EC_CAMERA_MASK (1 << 0)
74 #define OT_EC_BT_MASK (1 << 1)
75 #define OT_EC_GPS_MASK (1 << 2)
76 #define OT_EC_WIFI_MASK (1 << 3)
77 #define OT_EC_WWAN_MASK (1 << 4)
78 #define OT_EC_TS_MASK (1 << 5)
79
80 /*
81 * This is the address in EC space and commands used to control LCD backlight:
82 *
83 * Two steps needed to change the LCD backlight:
84 * 1. write the backlight percentage into OT_EC_BL_BRIGHTNESS_ADDRESS;
85 * 2. write OT_EC_BL_CONTROL_ON_DATA into OT_EC_BL_CONTROL_ADDRESS.
86 *
87 * To read the LCD back light, just read out the value from
88 * OT_EC_BL_BRIGHTNESS_ADDRESS.
89 *
90 * LCD backlight brightness range: 0 - 100 (OT_EC_BL_BRIGHTNESS_MAX)
91 */
92 #define OT_EC_BL_BRIGHTNESS_ADDRESS 0x44
93 #define OT_EC_BL_BRIGHTNESS_MAX 100
94 #define OT_EC_BL_CONTROL_ADDRESS 0x3A
95 #define OT_EC_BL_CONTROL_ON_DATA 0x1A
96
97
98 static bool force;
99 module_param(force, bool, 0);
100 MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
101
102 static struct platform_device *oaktrail_device;
103 static struct backlight_device *oaktrail_bl_device;
104 static struct rfkill *bt_rfkill;
105 static struct rfkill *gps_rfkill;
106 static struct rfkill *wifi_rfkill;
107 static struct rfkill *wwan_rfkill;
108
109
110 /* rfkill */
oaktrail_rfkill_set(void * data,bool blocked)111 static int oaktrail_rfkill_set(void *data, bool blocked)
112 {
113 u8 value;
114 u8 result;
115 unsigned long radio = (unsigned long) data;
116
117 ec_read(OT_EC_DEVICE_STATE_ADDRESS, &result);
118
119 if (!blocked)
120 value = (u8) (result | radio);
121 else
122 value = (u8) (result & ~radio);
123
124 ec_write(OT_EC_DEVICE_STATE_ADDRESS, value);
125
126 return 0;
127 }
128
129 static const struct rfkill_ops oaktrail_rfkill_ops = {
130 .set_block = oaktrail_rfkill_set,
131 };
132
oaktrail_rfkill_new(char * name,enum rfkill_type type,unsigned long mask)133 static struct rfkill *oaktrail_rfkill_new(char *name, enum rfkill_type type,
134 unsigned long mask)
135 {
136 struct rfkill *rfkill_dev;
137 u8 value;
138 int err;
139
140 rfkill_dev = rfkill_alloc(name, &oaktrail_device->dev, type,
141 &oaktrail_rfkill_ops, (void *)mask);
142 if (!rfkill_dev)
143 return ERR_PTR(-ENOMEM);
144
145 ec_read(OT_EC_DEVICE_STATE_ADDRESS, &value);
146 rfkill_init_sw_state(rfkill_dev, (value & mask) != 1);
147
148 err = rfkill_register(rfkill_dev);
149 if (err) {
150 rfkill_destroy(rfkill_dev);
151 return ERR_PTR(err);
152 }
153
154 return rfkill_dev;
155 }
156
__oaktrail_rfkill_cleanup(struct rfkill * rf)157 static inline void __oaktrail_rfkill_cleanup(struct rfkill *rf)
158 {
159 if (rf) {
160 rfkill_unregister(rf);
161 rfkill_destroy(rf);
162 }
163 }
164
oaktrail_rfkill_cleanup(void)165 static void oaktrail_rfkill_cleanup(void)
166 {
167 __oaktrail_rfkill_cleanup(wifi_rfkill);
168 __oaktrail_rfkill_cleanup(bt_rfkill);
169 __oaktrail_rfkill_cleanup(gps_rfkill);
170 __oaktrail_rfkill_cleanup(wwan_rfkill);
171 }
172
oaktrail_rfkill_init(void)173 static int oaktrail_rfkill_init(void)
174 {
175 int ret;
176
177 wifi_rfkill = oaktrail_rfkill_new("oaktrail-wifi",
178 RFKILL_TYPE_WLAN,
179 OT_EC_WIFI_MASK);
180 if (IS_ERR(wifi_rfkill)) {
181 ret = PTR_ERR(wifi_rfkill);
182 wifi_rfkill = NULL;
183 goto cleanup;
184 }
185
186 bt_rfkill = oaktrail_rfkill_new("oaktrail-bluetooth",
187 RFKILL_TYPE_BLUETOOTH,
188 OT_EC_BT_MASK);
189 if (IS_ERR(bt_rfkill)) {
190 ret = PTR_ERR(bt_rfkill);
191 bt_rfkill = NULL;
192 goto cleanup;
193 }
194
195 gps_rfkill = oaktrail_rfkill_new("oaktrail-gps",
196 RFKILL_TYPE_GPS,
197 OT_EC_GPS_MASK);
198 if (IS_ERR(gps_rfkill)) {
199 ret = PTR_ERR(gps_rfkill);
200 gps_rfkill = NULL;
201 goto cleanup;
202 }
203
204 wwan_rfkill = oaktrail_rfkill_new("oaktrail-wwan",
205 RFKILL_TYPE_WWAN,
206 OT_EC_WWAN_MASK);
207 if (IS_ERR(wwan_rfkill)) {
208 ret = PTR_ERR(wwan_rfkill);
209 wwan_rfkill = NULL;
210 goto cleanup;
211 }
212
213 return 0;
214
215 cleanup:
216 oaktrail_rfkill_cleanup();
217 return ret;
218 }
219
220
221 /* backlight */
get_backlight_brightness(struct backlight_device * b)222 static int get_backlight_brightness(struct backlight_device *b)
223 {
224 u8 value;
225 ec_read(OT_EC_BL_BRIGHTNESS_ADDRESS, &value);
226
227 return value;
228 }
229
set_backlight_brightness(struct backlight_device * b)230 static int set_backlight_brightness(struct backlight_device *b)
231 {
232 u8 percent = (u8) b->props.brightness;
233 if (percent < 0 || percent > OT_EC_BL_BRIGHTNESS_MAX)
234 return -EINVAL;
235
236 ec_write(OT_EC_BL_BRIGHTNESS_ADDRESS, percent);
237 ec_write(OT_EC_BL_CONTROL_ADDRESS, OT_EC_BL_CONTROL_ON_DATA);
238
239 return 0;
240 }
241
242 static const struct backlight_ops oaktrail_bl_ops = {
243 .get_brightness = get_backlight_brightness,
244 .update_status = set_backlight_brightness,
245 };
246
oaktrail_backlight_init(void)247 static int oaktrail_backlight_init(void)
248 {
249 struct backlight_device *bd;
250 struct backlight_properties props;
251
252 memset(&props, 0, sizeof(struct backlight_properties));
253 props.type = BACKLIGHT_PLATFORM;
254 props.max_brightness = OT_EC_BL_BRIGHTNESS_MAX;
255 bd = backlight_device_register(DRIVER_NAME,
256 &oaktrail_device->dev, NULL,
257 &oaktrail_bl_ops,
258 &props);
259
260 if (IS_ERR(bd)) {
261 oaktrail_bl_device = NULL;
262 pr_warning("Unable to register backlight device\n");
263 return PTR_ERR(bd);
264 }
265
266 oaktrail_bl_device = bd;
267
268 bd->props.brightness = get_backlight_brightness(bd);
269 bd->props.power = FB_BLANK_UNBLANK;
270 backlight_update_status(bd);
271
272 return 0;
273 }
274
oaktrail_backlight_exit(void)275 static void oaktrail_backlight_exit(void)
276 {
277 if (oaktrail_bl_device)
278 backlight_device_unregister(oaktrail_bl_device);
279 }
280
oaktrail_probe(struct platform_device * pdev)281 static int __devinit oaktrail_probe(struct platform_device *pdev)
282 {
283 return 0;
284 }
285
oaktrail_remove(struct platform_device * pdev)286 static int __devexit oaktrail_remove(struct platform_device *pdev)
287 {
288 return 0;
289 }
290
291 static struct platform_driver oaktrail_driver = {
292 .driver = {
293 .name = DRIVER_NAME,
294 .owner = THIS_MODULE,
295 },
296 .probe = oaktrail_probe,
297 .remove = __devexit_p(oaktrail_remove)
298 };
299
dmi_check_cb(const struct dmi_system_id * id)300 static int dmi_check_cb(const struct dmi_system_id *id)
301 {
302 pr_info("Identified model '%s'\n", id->ident);
303 return 0;
304 }
305
306 static struct dmi_system_id __initdata oaktrail_dmi_table[] = {
307 {
308 .ident = "OakTrail platform",
309 .matches = {
310 DMI_MATCH(DMI_PRODUCT_NAME, "OakTrail platform"),
311 },
312 .callback = dmi_check_cb
313 },
314 { }
315 };
316
oaktrail_init(void)317 static int __init oaktrail_init(void)
318 {
319 int ret;
320
321 if (acpi_disabled) {
322 pr_err("ACPI needs to be enabled for this driver to work!\n");
323 return -ENODEV;
324 }
325
326 if (!force && !dmi_check_system(oaktrail_dmi_table)) {
327 pr_err("Platform not recognized (You could try the module's force-parameter)");
328 return -ENODEV;
329 }
330
331 ret = platform_driver_register(&oaktrail_driver);
332 if (ret) {
333 pr_warning("Unable to register platform driver\n");
334 goto err_driver_reg;
335 }
336
337 oaktrail_device = platform_device_alloc(DRIVER_NAME, -1);
338 if (!oaktrail_device) {
339 pr_warning("Unable to allocate platform device\n");
340 ret = -ENOMEM;
341 goto err_device_alloc;
342 }
343
344 ret = platform_device_add(oaktrail_device);
345 if (ret) {
346 pr_warning("Unable to add platform device\n");
347 goto err_device_add;
348 }
349
350 if (!acpi_video_backlight_support()) {
351 ret = oaktrail_backlight_init();
352 if (ret)
353 goto err_backlight;
354
355 } else
356 pr_info("Backlight controlled by ACPI video driver\n");
357
358 ret = oaktrail_rfkill_init();
359 if (ret) {
360 pr_warning("Setup rfkill failed\n");
361 goto err_rfkill;
362 }
363
364 pr_info("Driver "DRIVER_VERSION" successfully loaded\n");
365 return 0;
366
367 err_rfkill:
368 oaktrail_backlight_exit();
369 err_backlight:
370 platform_device_del(oaktrail_device);
371 err_device_add:
372 platform_device_put(oaktrail_device);
373 err_device_alloc:
374 platform_driver_unregister(&oaktrail_driver);
375 err_driver_reg:
376
377 return ret;
378 }
379
oaktrail_cleanup(void)380 static void __exit oaktrail_cleanup(void)
381 {
382 oaktrail_backlight_exit();
383 oaktrail_rfkill_cleanup();
384 platform_device_unregister(oaktrail_device);
385 platform_driver_unregister(&oaktrail_driver);
386
387 pr_info("Driver unloaded\n");
388 }
389
390 module_init(oaktrail_init);
391 module_exit(oaktrail_cleanup);
392
393 MODULE_AUTHOR("Yin Kangkai (kangkai.yin@intel.com)");
394 MODULE_DESCRIPTION("Intel Oaktrail Platform ACPI Extras");
395 MODULE_VERSION(DRIVER_VERSION);
396 MODULE_LICENSE("GPL");
397 MODULE_ALIAS("dmi:*:svnIntelCorporation:pnOakTrailplatform:*");
398