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Yin Kangkaibb3ce202011-04-06 15:05:24 +01001/*
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>
Yin Kangkaibb3ce202011-04-06 15:05:24 +010053
54#define DRIVER_NAME "intel_oaktrail"
55#define DRIVER_VERSION "0.4ac1"
56
57/*
58 * This is the devices status address in EC space, and the control bits
59 * definition:
60 *
61 * (1 << 0): Camera enable/disable, RW.
62 * (1 << 1): Bluetooth enable/disable, RW.
63 * (1 << 2): GPS enable/disable, RW.
64 * (1 << 3): WiFi enable/disable, RW.
65 * (1 << 4): WWAN (3G) enable/disalbe, RW.
66 * (1 << 5): Touchscreen enable/disable, Read Only.
67 */
68#define OT_EC_DEVICE_STATE_ADDRESS 0xD6
69
70#define OT_EC_CAMERA_MASK (1 << 0)
71#define OT_EC_BT_MASK (1 << 1)
72#define OT_EC_GPS_MASK (1 << 2)
73#define OT_EC_WIFI_MASK (1 << 3)
74#define OT_EC_WWAN_MASK (1 << 4)
75#define OT_EC_TS_MASK (1 << 5)
76
77/*
78 * This is the address in EC space and commands used to control LCD backlight:
79 *
80 * Two steps needed to change the LCD backlight:
81 * 1. write the backlight percentage into OT_EC_BL_BRIGHTNESS_ADDRESS;
82 * 2. write OT_EC_BL_CONTROL_ON_DATA into OT_EC_BL_CONTROL_ADDRESS.
83 *
84 * To read the LCD back light, just read out the value from
85 * OT_EC_BL_BRIGHTNESS_ADDRESS.
86 *
87 * LCD backlight brightness range: 0 - 100 (OT_EC_BL_BRIGHTNESS_MAX)
88 */
89#define OT_EC_BL_BRIGHTNESS_ADDRESS 0x44
90#define OT_EC_BL_BRIGHTNESS_MAX 100
91#define OT_EC_BL_CONTROL_ADDRESS 0x3A
92#define OT_EC_BL_CONTROL_ON_DATA 0x1A
93
94
Rusty Russell90ab5ee2012-01-13 09:32:20 +103095static bool force;
Yin Kangkaibb3ce202011-04-06 15:05:24 +010096module_param(force, bool, 0);
97MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
98
99static struct platform_device *oaktrail_device;
100static struct backlight_device *oaktrail_bl_device;
101static struct rfkill *bt_rfkill;
102static struct rfkill *gps_rfkill;
103static struct rfkill *wifi_rfkill;
104static struct rfkill *wwan_rfkill;
105
106
107/* rfkill */
108static int oaktrail_rfkill_set(void *data, bool blocked)
109{
110 u8 value;
111 u8 result;
112 unsigned long radio = (unsigned long) data;
113
114 ec_read(OT_EC_DEVICE_STATE_ADDRESS, &result);
115
116 if (!blocked)
117 value = (u8) (result | radio);
118 else
119 value = (u8) (result & ~radio);
120
121 ec_write(OT_EC_DEVICE_STATE_ADDRESS, value);
122
123 return 0;
124}
125
126static const struct rfkill_ops oaktrail_rfkill_ops = {
127 .set_block = oaktrail_rfkill_set,
128};
129
130static struct rfkill *oaktrail_rfkill_new(char *name, enum rfkill_type type,
131 unsigned long mask)
132{
133 struct rfkill *rfkill_dev;
134 u8 value;
135 int err;
136
137 rfkill_dev = rfkill_alloc(name, &oaktrail_device->dev, type,
138 &oaktrail_rfkill_ops, (void *)mask);
139 if (!rfkill_dev)
140 return ERR_PTR(-ENOMEM);
141
142 ec_read(OT_EC_DEVICE_STATE_ADDRESS, &value);
143 rfkill_init_sw_state(rfkill_dev, (value & mask) != 1);
144
145 err = rfkill_register(rfkill_dev);
146 if (err) {
147 rfkill_destroy(rfkill_dev);
148 return ERR_PTR(err);
149 }
150
151 return rfkill_dev;
152}
153
154static inline void __oaktrail_rfkill_cleanup(struct rfkill *rf)
155{
156 if (rf) {
157 rfkill_unregister(rf);
158 rfkill_destroy(rf);
159 }
160}
161
162static void oaktrail_rfkill_cleanup(void)
163{
164 __oaktrail_rfkill_cleanup(wifi_rfkill);
165 __oaktrail_rfkill_cleanup(bt_rfkill);
166 __oaktrail_rfkill_cleanup(gps_rfkill);
167 __oaktrail_rfkill_cleanup(wwan_rfkill);
168}
169
170static int oaktrail_rfkill_init(void)
171{
172 int ret;
173
174 wifi_rfkill = oaktrail_rfkill_new("oaktrail-wifi",
175 RFKILL_TYPE_WLAN,
176 OT_EC_WIFI_MASK);
177 if (IS_ERR(wifi_rfkill)) {
178 ret = PTR_ERR(wifi_rfkill);
179 wifi_rfkill = NULL;
180 goto cleanup;
181 }
182
183 bt_rfkill = oaktrail_rfkill_new("oaktrail-bluetooth",
184 RFKILL_TYPE_BLUETOOTH,
185 OT_EC_BT_MASK);
186 if (IS_ERR(bt_rfkill)) {
187 ret = PTR_ERR(bt_rfkill);
188 bt_rfkill = NULL;
189 goto cleanup;
190 }
191
192 gps_rfkill = oaktrail_rfkill_new("oaktrail-gps",
193 RFKILL_TYPE_GPS,
194 OT_EC_GPS_MASK);
195 if (IS_ERR(gps_rfkill)) {
196 ret = PTR_ERR(gps_rfkill);
197 gps_rfkill = NULL;
198 goto cleanup;
199 }
200
201 wwan_rfkill = oaktrail_rfkill_new("oaktrail-wwan",
202 RFKILL_TYPE_WWAN,
203 OT_EC_WWAN_MASK);
204 if (IS_ERR(wwan_rfkill)) {
205 ret = PTR_ERR(wwan_rfkill);
206 wwan_rfkill = NULL;
207 goto cleanup;
208 }
209
210 return 0;
211
212cleanup:
213 oaktrail_rfkill_cleanup();
214 return ret;
215}
216
217
218/* backlight */
219static int get_backlight_brightness(struct backlight_device *b)
220{
221 u8 value;
222 ec_read(OT_EC_BL_BRIGHTNESS_ADDRESS, &value);
223
224 return value;
225}
226
227static int set_backlight_brightness(struct backlight_device *b)
228{
229 u8 percent = (u8) b->props.brightness;
230 if (percent < 0 || percent > OT_EC_BL_BRIGHTNESS_MAX)
231 return -EINVAL;
232
233 ec_write(OT_EC_BL_BRIGHTNESS_ADDRESS, percent);
234 ec_write(OT_EC_BL_CONTROL_ADDRESS, OT_EC_BL_CONTROL_ON_DATA);
235
236 return 0;
237}
238
239static const struct backlight_ops oaktrail_bl_ops = {
240 .get_brightness = get_backlight_brightness,
241 .update_status = set_backlight_brightness,
242};
243
244static int oaktrail_backlight_init(void)
245{
246 struct backlight_device *bd;
247 struct backlight_properties props;
248
249 memset(&props, 0, sizeof(struct backlight_properties));
Axel Lin60cfa092011-06-29 11:43:30 +0800250 props.type = BACKLIGHT_PLATFORM;
Yin Kangkaibb3ce202011-04-06 15:05:24 +0100251 props.max_brightness = OT_EC_BL_BRIGHTNESS_MAX;
252 bd = backlight_device_register(DRIVER_NAME,
253 &oaktrail_device->dev, NULL,
254 &oaktrail_bl_ops,
255 &props);
256
257 if (IS_ERR(bd)) {
258 oaktrail_bl_device = NULL;
259 pr_warning("Unable to register backlight device\n");
260 return PTR_ERR(bd);
261 }
262
263 oaktrail_bl_device = bd;
264
265 bd->props.brightness = get_backlight_brightness(bd);
266 bd->props.power = FB_BLANK_UNBLANK;
267 backlight_update_status(bd);
268
269 return 0;
270}
271
272static void oaktrail_backlight_exit(void)
273{
Markus Elfring00981812014-11-24 20:30:29 +0100274 backlight_device_unregister(oaktrail_bl_device);
Yin Kangkaibb3ce202011-04-06 15:05:24 +0100275}
276
Greg Kroah-Hartmanb859f152012-12-21 13:18:33 -0800277static int oaktrail_probe(struct platform_device *pdev)
Yin Kangkaibb3ce202011-04-06 15:05:24 +0100278{
279 return 0;
280}
281
Greg Kroah-Hartmanb859f152012-12-21 13:18:33 -0800282static int oaktrail_remove(struct platform_device *pdev)
Yin Kangkaibb3ce202011-04-06 15:05:24 +0100283{
284 return 0;
285}
286
287static struct platform_driver oaktrail_driver = {
288 .driver = {
289 .name = DRIVER_NAME,
Yin Kangkaibb3ce202011-04-06 15:05:24 +0100290 },
291 .probe = oaktrail_probe,
Greg Kroah-Hartmanb859f152012-12-21 13:18:33 -0800292 .remove = oaktrail_remove,
Yin Kangkaibb3ce202011-04-06 15:05:24 +0100293};
294
295static int dmi_check_cb(const struct dmi_system_id *id)
296{
297 pr_info("Identified model '%s'\n", id->ident);
298 return 0;
299}
300
301static struct dmi_system_id __initdata oaktrail_dmi_table[] = {
302 {
303 .ident = "OakTrail platform",
304 .matches = {
305 DMI_MATCH(DMI_PRODUCT_NAME, "OakTrail platform"),
306 },
307 .callback = dmi_check_cb
308 },
309 { }
310};
Dmitry Torokhovdc2cbb32011-11-14 00:27:00 -0800311MODULE_DEVICE_TABLE(dmi, oaktrail_dmi_table);
Yin Kangkaibb3ce202011-04-06 15:05:24 +0100312
313static int __init oaktrail_init(void)
314{
315 int ret;
316
317 if (acpi_disabled) {
318 pr_err("ACPI needs to be enabled for this driver to work!\n");
319 return -ENODEV;
320 }
321
322 if (!force && !dmi_check_system(oaktrail_dmi_table)) {
323 pr_err("Platform not recognized (You could try the module's force-parameter)");
324 return -ENODEV;
325 }
326
327 ret = platform_driver_register(&oaktrail_driver);
328 if (ret) {
329 pr_warning("Unable to register platform driver\n");
330 goto err_driver_reg;
331 }
332
333 oaktrail_device = platform_device_alloc(DRIVER_NAME, -1);
334 if (!oaktrail_device) {
335 pr_warning("Unable to allocate platform device\n");
336 ret = -ENOMEM;
337 goto err_device_alloc;
338 }
339
340 ret = platform_device_add(oaktrail_device);
341 if (ret) {
342 pr_warning("Unable to add platform device\n");
343 goto err_device_add;
344 }
345
346 if (!acpi_video_backlight_support()) {
347 ret = oaktrail_backlight_init();
348 if (ret)
349 goto err_backlight;
350
351 } else
352 pr_info("Backlight controlled by ACPI video driver\n");
353
354 ret = oaktrail_rfkill_init();
355 if (ret) {
356 pr_warning("Setup rfkill failed\n");
357 goto err_rfkill;
358 }
359
360 pr_info("Driver "DRIVER_VERSION" successfully loaded\n");
361 return 0;
362
363err_rfkill:
364 oaktrail_backlight_exit();
365err_backlight:
366 platform_device_del(oaktrail_device);
367err_device_add:
368 platform_device_put(oaktrail_device);
369err_device_alloc:
370 platform_driver_unregister(&oaktrail_driver);
371err_driver_reg:
372
373 return ret;
374}
375
376static void __exit oaktrail_cleanup(void)
377{
378 oaktrail_backlight_exit();
379 oaktrail_rfkill_cleanup();
380 platform_device_unregister(oaktrail_device);
381 platform_driver_unregister(&oaktrail_driver);
382
383 pr_info("Driver unloaded\n");
384}
385
386module_init(oaktrail_init);
387module_exit(oaktrail_cleanup);
388
389MODULE_AUTHOR("Yin Kangkai (kangkai.yin@intel.com)");
390MODULE_DESCRIPTION("Intel Oaktrail Platform ACPI Extras");
391MODULE_VERSION(DRIVER_VERSION);
392MODULE_LICENSE("GPL");