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24
25#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
26
27#include <linux/acpi.h>
28#include <linux/backlight.h>
29#include <linux/dmi.h>
30#include <linux/err.h>
31#include <linux/fb.h>
32#include <linux/i2c.h>
33#include <linux/kernel.h>
34#include <linux/module.h>
35#include <linux/mutex.h>
36#include <linux/platform_device.h>
37#include <linux/rfkill.h>
38
39#include <acpi/video.h>
40
41#define DRIVER_NAME "intel_oaktrail"
42#define DRIVER_VERSION "0.4ac1"
43
44
45
46
47
48
49
50
51
52
53
54
55#define OT_EC_DEVICE_STATE_ADDRESS 0xD6
56
57#define OT_EC_CAMERA_MASK (1 << 0)
58#define OT_EC_BT_MASK (1 << 1)
59#define OT_EC_GPS_MASK (1 << 2)
60#define OT_EC_WIFI_MASK (1 << 3)
61#define OT_EC_WWAN_MASK (1 << 4)
62#define OT_EC_TS_MASK (1 << 5)
63
64
65
66
67
68
69
70
71
72
73
74
75
76#define OT_EC_BL_BRIGHTNESS_ADDRESS 0x44
77#define OT_EC_BL_BRIGHTNESS_MAX 100
78#define OT_EC_BL_CONTROL_ADDRESS 0x3A
79#define OT_EC_BL_CONTROL_ON_DATA 0x1A
80
81
82static bool force;
83module_param(force, bool, 0);
84MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
85
86static struct platform_device *oaktrail_device;
87static struct backlight_device *oaktrail_bl_device;
88static struct rfkill *bt_rfkill;
89static struct rfkill *gps_rfkill;
90static struct rfkill *wifi_rfkill;
91static struct rfkill *wwan_rfkill;
92
93
94
95static int oaktrail_rfkill_set(void *data, bool blocked)
96{
97 u8 value;
98 u8 result;
99 unsigned long radio = (unsigned long) data;
100
101 ec_read(OT_EC_DEVICE_STATE_ADDRESS, &result);
102
103 if (!blocked)
104 value = (u8) (result | radio);
105 else
106 value = (u8) (result & ~radio);
107
108 ec_write(OT_EC_DEVICE_STATE_ADDRESS, value);
109
110 return 0;
111}
112
113static const struct rfkill_ops oaktrail_rfkill_ops = {
114 .set_block = oaktrail_rfkill_set,
115};
116
117static struct rfkill *oaktrail_rfkill_new(char *name, enum rfkill_type type,
118 unsigned long mask)
119{
120 struct rfkill *rfkill_dev;
121 u8 value;
122 int err;
123
124 rfkill_dev = rfkill_alloc(name, &oaktrail_device->dev, type,
125 &oaktrail_rfkill_ops, (void *)mask);
126 if (!rfkill_dev)
127 return ERR_PTR(-ENOMEM);
128
129 ec_read(OT_EC_DEVICE_STATE_ADDRESS, &value);
130 rfkill_init_sw_state(rfkill_dev, (value & mask) != 1);
131
132 err = rfkill_register(rfkill_dev);
133 if (err) {
134 rfkill_destroy(rfkill_dev);
135 return ERR_PTR(err);
136 }
137
138 return rfkill_dev;
139}
140
141static inline void __oaktrail_rfkill_cleanup(struct rfkill *rf)
142{
143 if (rf) {
144 rfkill_unregister(rf);
145 rfkill_destroy(rf);
146 }
147}
148
149static void oaktrail_rfkill_cleanup(void)
150{
151 __oaktrail_rfkill_cleanup(wifi_rfkill);
152 __oaktrail_rfkill_cleanup(bt_rfkill);
153 __oaktrail_rfkill_cleanup(gps_rfkill);
154 __oaktrail_rfkill_cleanup(wwan_rfkill);
155}
156
157static int oaktrail_rfkill_init(void)
158{
159 int ret;
160
161 wifi_rfkill = oaktrail_rfkill_new("oaktrail-wifi",
162 RFKILL_TYPE_WLAN,
163 OT_EC_WIFI_MASK);
164 if (IS_ERR(wifi_rfkill)) {
165 ret = PTR_ERR(wifi_rfkill);
166 wifi_rfkill = NULL;
167 goto cleanup;
168 }
169
170 bt_rfkill = oaktrail_rfkill_new("oaktrail-bluetooth",
171 RFKILL_TYPE_BLUETOOTH,
172 OT_EC_BT_MASK);
173 if (IS_ERR(bt_rfkill)) {
174 ret = PTR_ERR(bt_rfkill);
175 bt_rfkill = NULL;
176 goto cleanup;
177 }
178
179 gps_rfkill = oaktrail_rfkill_new("oaktrail-gps",
180 RFKILL_TYPE_GPS,
181 OT_EC_GPS_MASK);
182 if (IS_ERR(gps_rfkill)) {
183 ret = PTR_ERR(gps_rfkill);
184 gps_rfkill = NULL;
185 goto cleanup;
186 }
187
188 wwan_rfkill = oaktrail_rfkill_new("oaktrail-wwan",
189 RFKILL_TYPE_WWAN,
190 OT_EC_WWAN_MASK);
191 if (IS_ERR(wwan_rfkill)) {
192 ret = PTR_ERR(wwan_rfkill);
193 wwan_rfkill = NULL;
194 goto cleanup;
195 }
196
197 return 0;
198
199cleanup:
200 oaktrail_rfkill_cleanup();
201 return ret;
202}
203
204
205
206static int get_backlight_brightness(struct backlight_device *b)
207{
208 u8 value;
209 ec_read(OT_EC_BL_BRIGHTNESS_ADDRESS, &value);
210
211 return value;
212}
213
214static int set_backlight_brightness(struct backlight_device *b)
215{
216 u8 percent = (u8) b->props.brightness;
217 if (percent < 0 || percent > OT_EC_BL_BRIGHTNESS_MAX)
218 return -EINVAL;
219
220 ec_write(OT_EC_BL_BRIGHTNESS_ADDRESS, percent);
221 ec_write(OT_EC_BL_CONTROL_ADDRESS, OT_EC_BL_CONTROL_ON_DATA);
222
223 return 0;
224}
225
226static const struct backlight_ops oaktrail_bl_ops = {
227 .get_brightness = get_backlight_brightness,
228 .update_status = set_backlight_brightness,
229};
230
231static int oaktrail_backlight_init(void)
232{
233 struct backlight_device *bd;
234 struct backlight_properties props;
235
236 memset(&props, 0, sizeof(struct backlight_properties));
237 props.type = BACKLIGHT_PLATFORM;
238 props.max_brightness = OT_EC_BL_BRIGHTNESS_MAX;
239 bd = backlight_device_register(DRIVER_NAME,
240 &oaktrail_device->dev, NULL,
241 &oaktrail_bl_ops,
242 &props);
243
244 if (IS_ERR(bd)) {
245 oaktrail_bl_device = NULL;
246 pr_warn("Unable to register backlight device\n");
247 return PTR_ERR(bd);
248 }
249
250 oaktrail_bl_device = bd;
251
252 bd->props.brightness = get_backlight_brightness(bd);
253 bd->props.power = FB_BLANK_UNBLANK;
254 backlight_update_status(bd);
255
256 return 0;
257}
258
259static void oaktrail_backlight_exit(void)
260{
261 backlight_device_unregister(oaktrail_bl_device);
262}
263
264static int oaktrail_probe(struct platform_device *pdev)
265{
266 return 0;
267}
268
269static int oaktrail_remove(struct platform_device *pdev)
270{
271 return 0;
272}
273
274static struct platform_driver oaktrail_driver = {
275 .driver = {
276 .name = DRIVER_NAME,
277 },
278 .probe = oaktrail_probe,
279 .remove = oaktrail_remove,
280};
281
282static int dmi_check_cb(const struct dmi_system_id *id)
283{
284 pr_info("Identified model '%s'\n", id->ident);
285 return 0;
286}
287
288static const struct dmi_system_id oaktrail_dmi_table[] __initconst = {
289 {
290 .ident = "OakTrail platform",
291 .matches = {
292 DMI_MATCH(DMI_PRODUCT_NAME, "OakTrail platform"),
293 },
294 .callback = dmi_check_cb
295 },
296 { }
297};
298MODULE_DEVICE_TABLE(dmi, oaktrail_dmi_table);
299
300static int __init oaktrail_init(void)
301{
302 int ret;
303
304 if (acpi_disabled) {
305 pr_err("ACPI needs to be enabled for this driver to work!\n");
306 return -ENODEV;
307 }
308
309 if (!force && !dmi_check_system(oaktrail_dmi_table)) {
310 pr_err("Platform not recognized (You could try the module's force-parameter)");
311 return -ENODEV;
312 }
313
314 ret = platform_driver_register(&oaktrail_driver);
315 if (ret) {
316 pr_warn("Unable to register platform driver\n");
317 goto err_driver_reg;
318 }
319
320 oaktrail_device = platform_device_alloc(DRIVER_NAME, -1);
321 if (!oaktrail_device) {
322 pr_warn("Unable to allocate platform device\n");
323 ret = -ENOMEM;
324 goto err_device_alloc;
325 }
326
327 ret = platform_device_add(oaktrail_device);
328 if (ret) {
329 pr_warn("Unable to add platform device\n");
330 goto err_device_add;
331 }
332
333 if (acpi_video_get_backlight_type() == acpi_backlight_vendor) {
334 ret = oaktrail_backlight_init();
335 if (ret)
336 goto err_backlight;
337 }
338
339 ret = oaktrail_rfkill_init();
340 if (ret) {
341 pr_warn("Setup rfkill failed\n");
342 goto err_rfkill;
343 }
344
345 pr_info("Driver "DRIVER_VERSION" successfully loaded\n");
346 return 0;
347
348err_rfkill:
349 oaktrail_backlight_exit();
350err_backlight:
351 platform_device_del(oaktrail_device);
352err_device_add:
353 platform_device_put(oaktrail_device);
354err_device_alloc:
355 platform_driver_unregister(&oaktrail_driver);
356err_driver_reg:
357
358 return ret;
359}
360
361static void __exit oaktrail_cleanup(void)
362{
363 oaktrail_backlight_exit();
364 oaktrail_rfkill_cleanup();
365 platform_device_unregister(oaktrail_device);
366 platform_driver_unregister(&oaktrail_driver);
367
368 pr_info("Driver unloaded\n");
369}
370
371module_init(oaktrail_init);
372module_exit(oaktrail_cleanup);
373
374MODULE_AUTHOR("Yin Kangkai (kangkai.yin@intel.com)");
375MODULE_DESCRIPTION("Intel Oaktrail Platform ACPI Extras");
376MODULE_VERSION(DRIVER_VERSION);
377MODULE_LICENSE("GPL");
378
