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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
96static bool force;
97module_param(force, bool, 0);
98MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
99
100static struct platform_device *oaktrail_device;
101static struct backlight_device *oaktrail_bl_device;
102static struct rfkill *bt_rfkill;
103static struct rfkill *gps_rfkill;
104static struct rfkill *wifi_rfkill;
105static struct rfkill *wwan_rfkill;
106
107
108/* rfkill */
109static 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
127static const struct rfkill_ops oaktrail_rfkill_ops = {
128 .set_block = oaktrail_rfkill_set,
129};
130
131static 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
155static inline void __oaktrail_rfkill_cleanup(struct rfkill *rf)
156{
157 if (rf) {
158 rfkill_unregister(rf);
159 rfkill_destroy(rf);
160 }
161}
162
163static 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
171static 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
213cleanup:
214 oaktrail_rfkill_cleanup();
215 return ret;
216}
217
218
219/* backlight */
220static 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
228static 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
240static const struct backlight_ops oaktrail_bl_ops = {
241 .get_brightness = get_backlight_brightness,
242 .update_status = set_backlight_brightness,
243};
244
245static 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
273static void oaktrail_backlight_exit(void)
274{
275 backlight_device_unregister(oaktrail_bl_device);
276}
277
278static int oaktrail_probe(struct platform_device *pdev)
279{
280 return 0;
281}
282
283static int oaktrail_remove(struct platform_device *pdev)
284{
285 return 0;
286}
287
288static struct platform_driver oaktrail_driver = {
289 .driver = {
290 .name = DRIVER_NAME,
291 },
292 .probe = oaktrail_probe,
293 .remove = oaktrail_remove,
294};
295
296static 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
302static struct dmi_system_id __initdata oaktrail_dmi_table[] = {
303 {
304 .ident = "OakTrail platform",
305 .matches = {
306 DMI_MATCH(DMI_PRODUCT_NAME, "OakTrail platform"),
307 },
308 .callback = dmi_check_cb
309 },
310 { }
311};
312MODULE_DEVICE_TABLE(dmi, oaktrail_dmi_table);
313
314static 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
362err_rfkill:
363 oaktrail_backlight_exit();
364err_backlight:
365 platform_device_del(oaktrail_device);
366err_device_add:
367 platform_device_put(oaktrail_device);
368err_device_alloc:
369 platform_driver_unregister(&oaktrail_driver);
370err_driver_reg:
371
372 return ret;
373}
374
375static 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
385module_init(oaktrail_init);
386module_exit(oaktrail_cleanup);
387
388MODULE_AUTHOR("Yin Kangkai (kangkai.yin@intel.com)");
389MODULE_DESCRIPTION("Intel Oaktrail Platform ACPI Extras");
390MODULE_VERSION(DRIVER_VERSION);
391MODULE_LICENSE("GPL");
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
98static bool force;
99module_param(force, bool, 0);
100MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
101
102static struct platform_device *oaktrail_device;
103static struct backlight_device *oaktrail_bl_device;
104static struct rfkill *bt_rfkill;
105static struct rfkill *gps_rfkill;
106static struct rfkill *wifi_rfkill;
107static struct rfkill *wwan_rfkill;
108
109
110/* rfkill */
111static 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
129static const struct rfkill_ops oaktrail_rfkill_ops = {
130 .set_block = oaktrail_rfkill_set,
131};
132
133static 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
157static inline void __oaktrail_rfkill_cleanup(struct rfkill *rf)
158{
159 if (rf) {
160 rfkill_unregister(rf);
161 rfkill_destroy(rf);
162 }
163}
164
165static 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
173static 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
215cleanup:
216 oaktrail_rfkill_cleanup();
217 return ret;
218}
219
220
221/* backlight */
222static 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
230static 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
242static const struct backlight_ops oaktrail_bl_ops = {
243 .get_brightness = get_backlight_brightness,
244 .update_status = set_backlight_brightness,
245};
246
247static 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
275static void oaktrail_backlight_exit(void)
276{
277 if (oaktrail_bl_device)
278 backlight_device_unregister(oaktrail_bl_device);
279}
280
281static int __devinit oaktrail_probe(struct platform_device *pdev)
282{
283 return 0;
284}
285
286static int __devexit oaktrail_remove(struct platform_device *pdev)
287{
288 return 0;
289}
290
291static 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
300static 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
306static 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};
316MODULE_DEVICE_TABLE(dmi, oaktrail_dmi_table);
317
318static int __init oaktrail_init(void)
319{
320 int ret;
321
322 if (acpi_disabled) {
323 pr_err("ACPI needs to be enabled for this driver to work!\n");
324 return -ENODEV;
325 }
326
327 if (!force && !dmi_check_system(oaktrail_dmi_table)) {
328 pr_err("Platform not recognized (You could try the module's force-parameter)");
329 return -ENODEV;
330 }
331
332 ret = platform_driver_register(&oaktrail_driver);
333 if (ret) {
334 pr_warning("Unable to register platform driver\n");
335 goto err_driver_reg;
336 }
337
338 oaktrail_device = platform_device_alloc(DRIVER_NAME, -1);
339 if (!oaktrail_device) {
340 pr_warning("Unable to allocate platform device\n");
341 ret = -ENOMEM;
342 goto err_device_alloc;
343 }
344
345 ret = platform_device_add(oaktrail_device);
346 if (ret) {
347 pr_warning("Unable to add platform device\n");
348 goto err_device_add;
349 }
350
351 if (!acpi_video_backlight_support()) {
352 ret = oaktrail_backlight_init();
353 if (ret)
354 goto err_backlight;
355
356 } else
357 pr_info("Backlight controlled by ACPI video driver\n");
358
359 ret = oaktrail_rfkill_init();
360 if (ret) {
361 pr_warning("Setup rfkill failed\n");
362 goto err_rfkill;
363 }
364
365 pr_info("Driver "DRIVER_VERSION" successfully loaded\n");
366 return 0;
367
368err_rfkill:
369 oaktrail_backlight_exit();
370err_backlight:
371 platform_device_del(oaktrail_device);
372err_device_add:
373 platform_device_put(oaktrail_device);
374err_device_alloc:
375 platform_driver_unregister(&oaktrail_driver);
376err_driver_reg:
377
378 return ret;
379}
380
381static void __exit oaktrail_cleanup(void)
382{
383 oaktrail_backlight_exit();
384 oaktrail_rfkill_cleanup();
385 platform_device_unregister(oaktrail_device);
386 platform_driver_unregister(&oaktrail_driver);
387
388 pr_info("Driver unloaded\n");
389}
390
391module_init(oaktrail_init);
392module_exit(oaktrail_cleanup);
393
394MODULE_AUTHOR("Yin Kangkai (kangkai.yin@intel.com)");
395MODULE_DESCRIPTION("Intel Oaktrail Platform ACPI Extras");
396MODULE_VERSION(DRIVER_VERSION);
397MODULE_LICENSE("GPL");