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Linux/drivers/platform/x86/intel_oaktrail.c

  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 */
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 
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 
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 
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 
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 */
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 
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 
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 
273 static void oaktrail_backlight_exit(void)
274 {
275         backlight_device_unregister(oaktrail_bl_device);
276 }
277 
278 static int oaktrail_probe(struct platform_device *pdev)
279 {
280         return 0;
281 }
282 
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 
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 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 };
312 MODULE_DEVICE_TABLE(dmi, oaktrail_dmi_table);
313 
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 
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 

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