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10#include <linux/module.h>
11#include <linux/slab.h>
12#include <linux/i2c.h>
13#include <linux/leds.h>
14#include <linux/backlight.h>
15#include <linux/err.h>
16#include <linux/delay.h>
17#include <linux/uaccess.h>
18#include <linux/interrupt.h>
19#include <linux/regmap.h>
20#include <linux/platform_data/lm3639_bl.h>
21
22#define REG_DEV_ID 0x00
23#define REG_CHECKSUM 0x01
24#define REG_BL_CONF_1 0x02
25#define REG_BL_CONF_2 0x03
26#define REG_BL_CONF_3 0x04
27#define REG_BL_CONF_4 0x05
28#define REG_FL_CONF_1 0x06
29#define REG_FL_CONF_2 0x07
30#define REG_FL_CONF_3 0x08
31#define REG_IO_CTRL 0x09
32#define REG_ENABLE 0x0A
33#define REG_FLAG 0x0B
34#define REG_MAX REG_FLAG
35
36struct lm3639_chip_data {
37 struct device *dev;
38 struct lm3639_platform_data *pdata;
39
40 struct backlight_device *bled;
41 struct led_classdev cdev_flash;
42 struct led_classdev cdev_torch;
43 struct regmap *regmap;
44
45 unsigned int bled_mode;
46 unsigned int bled_map;
47 unsigned int last_flag;
48};
49
50
51static int lm3639_chip_init(struct lm3639_chip_data *pchip)
52{
53 int ret;
54 unsigned int reg_val;
55 struct lm3639_platform_data *pdata = pchip->pdata;
56
57
58 ret =
59 regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x08,
60 pdata->pin_pwm);
61 if (ret < 0)
62 goto out;
63
64 reg_val = (pdata->pin_pwm & 0x40) | pdata->pin_strobe | pdata->pin_tx;
65 ret = regmap_update_bits(pchip->regmap, REG_IO_CTRL, 0x7C, reg_val);
66 if (ret < 0)
67 goto out;
68
69
70 ret = regmap_write(pchip->regmap, REG_BL_CONF_4, pdata->init_brt_led);
71 if (ret < 0)
72 goto out;
73
74 ret = regmap_write(pchip->regmap, REG_BL_CONF_3, pdata->init_brt_led);
75 if (ret < 0)
76 goto out;
77
78
79 if (!pdata->init_brt_led) {
80 reg_val = pdata->fled_pins;
81 reg_val |= pdata->bled_pins;
82 } else {
83 reg_val = pdata->fled_pins;
84 reg_val |= pdata->bled_pins | 0x01;
85 }
86
87 ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x79, reg_val);
88 if (ret < 0)
89 goto out;
90
91 return ret;
92out:
93 dev_err(pchip->dev, "i2c failed to access register\n");
94 return ret;
95}
96
97
98static int lm3639_bled_update_status(struct backlight_device *bl)
99{
100 int ret;
101 unsigned int reg_val;
102 struct lm3639_chip_data *pchip = bl_get_data(bl);
103 struct lm3639_platform_data *pdata = pchip->pdata;
104
105 ret = regmap_read(pchip->regmap, REG_FLAG, ®_val);
106 if (ret < 0)
107 goto out;
108
109 if (reg_val != 0)
110 dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);
111
112
113 if (pdata->pin_pwm) {
114 if (pdata->pwm_set_intensity)
115 pdata->pwm_set_intensity(bl->props.brightness,
116 pdata->max_brt_led);
117 else
118 dev_err(pchip->dev,
119 "No pwm control func. in plat-data\n");
120 return bl->props.brightness;
121 }
122
123
124 ret = regmap_write(pchip->regmap, REG_BL_CONF_4, bl->props.brightness);
125 if (ret < 0)
126 goto out;
127 ret = regmap_write(pchip->regmap, REG_BL_CONF_3, bl->props.brightness);
128 if (ret < 0)
129 goto out;
130
131 if (!bl->props.brightness)
132 ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x00);
133 else
134 ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x01);
135 if (ret < 0)
136 goto out;
137
138 return bl->props.brightness;
139out:
140 dev_err(pchip->dev, "i2c failed to access registers\n");
141 return bl->props.brightness;
142}
143
144static int lm3639_bled_get_brightness(struct backlight_device *bl)
145{
146 int ret;
147 unsigned int reg_val;
148 struct lm3639_chip_data *pchip = bl_get_data(bl);
149 struct lm3639_platform_data *pdata = pchip->pdata;
150
151 if (pdata->pin_pwm) {
152 if (pdata->pwm_get_intensity)
153 bl->props.brightness = pdata->pwm_get_intensity();
154 else
155 dev_err(pchip->dev,
156 "No pwm control func. in plat-data\n");
157 return bl->props.brightness;
158 }
159
160 ret = regmap_read(pchip->regmap, REG_BL_CONF_1, ®_val);
161 if (ret < 0)
162 goto out;
163 if (reg_val & 0x10)
164 ret = regmap_read(pchip->regmap, REG_BL_CONF_4, ®_val);
165 else
166 ret = regmap_read(pchip->regmap, REG_BL_CONF_3, ®_val);
167 if (ret < 0)
168 goto out;
169 bl->props.brightness = reg_val;
170
171 return bl->props.brightness;
172out:
173 dev_err(pchip->dev, "i2c failed to access register\n");
174 return bl->props.brightness;
175}
176
177static const struct backlight_ops lm3639_bled_ops = {
178 .options = BL_CORE_SUSPENDRESUME,
179 .update_status = lm3639_bled_update_status,
180 .get_brightness = lm3639_bled_get_brightness,
181};
182
183
184static ssize_t lm3639_bled_mode_store(struct device *dev,
185 struct device_attribute *devAttr,
186 const char *buf, size_t size)
187{
188 ssize_t ret;
189 struct lm3639_chip_data *pchip = dev_get_drvdata(dev);
190 unsigned int state;
191
192 ret = kstrtouint(buf, 10, &state);
193 if (ret)
194 goto out_input;
195
196 if (!state)
197 ret =
198 regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10,
199 0x00);
200 else
201 ret =
202 regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10,
203 0x10);
204
205 if (ret < 0)
206 goto out;
207
208 return size;
209
210out:
211 dev_err(pchip->dev, "%s:i2c access fail to register\n", __func__);
212 return ret;
213
214out_input:
215 dev_err(pchip->dev, "%s:input conversion fail\n", __func__);
216 return ret;
217
218}
219
220static DEVICE_ATTR(bled_mode, S_IWUSR, NULL, lm3639_bled_mode_store);
221
222
223static void lm3639_torch_brightness_set(struct led_classdev *cdev,
224 enum led_brightness brightness)
225{
226 int ret;
227 unsigned int reg_val;
228 struct lm3639_chip_data *pchip;
229
230 pchip = container_of(cdev, struct lm3639_chip_data, cdev_torch);
231
232 ret = regmap_read(pchip->regmap, REG_FLAG, ®_val);
233 if (ret < 0)
234 goto out;
235 if (reg_val != 0)
236 dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);
237
238
239 if (!brightness) {
240 ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00);
241 if (ret < 0)
242 goto out;
243 return;
244 }
245
246 ret = regmap_update_bits(pchip->regmap,
247 REG_FL_CONF_1, 0x70, (brightness - 1) << 4);
248 if (ret < 0)
249 goto out;
250 ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x02);
251 if (ret < 0)
252 goto out;
253
254 return;
255out:
256 dev_err(pchip->dev, "i2c failed to access register\n");
257}
258
259
260static void lm3639_flash_brightness_set(struct led_classdev *cdev,
261 enum led_brightness brightness)
262{
263 int ret;
264 unsigned int reg_val;
265 struct lm3639_chip_data *pchip;
266
267 pchip = container_of(cdev, struct lm3639_chip_data, cdev_flash);
268
269 ret = regmap_read(pchip->regmap, REG_FLAG, ®_val);
270 if (ret < 0)
271 goto out;
272 if (reg_val != 0)
273 dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);
274
275
276 ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00);
277 if (ret < 0)
278 goto out;
279
280
281 if (!brightness)
282 return;
283
284 ret = regmap_update_bits(pchip->regmap,
285 REG_FL_CONF_1, 0x0F, brightness - 1);
286 if (ret < 0)
287 goto out;
288 ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x06);
289 if (ret < 0)
290 goto out;
291
292 return;
293out:
294 dev_err(pchip->dev, "i2c failed to access register\n");
295}
296
297static const struct regmap_config lm3639_regmap = {
298 .reg_bits = 8,
299 .val_bits = 8,
300 .max_register = REG_MAX,
301};
302
303static int lm3639_probe(struct i2c_client *client,
304 const struct i2c_device_id *id)
305{
306 int ret;
307 struct lm3639_chip_data *pchip;
308 struct lm3639_platform_data *pdata = dev_get_platdata(&client->dev);
309 struct backlight_properties props;
310
311 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
312 dev_err(&client->dev, "i2c functionality check fail.\n");
313 return -EOPNOTSUPP;
314 }
315
316 if (pdata == NULL) {
317 dev_err(&client->dev, "Needs Platform Data.\n");
318 return -ENODATA;
319 }
320
321 pchip = devm_kzalloc(&client->dev,
322 sizeof(struct lm3639_chip_data), GFP_KERNEL);
323 if (!pchip)
324 return -ENOMEM;
325
326 pchip->pdata = pdata;
327 pchip->dev = &client->dev;
328
329 pchip->regmap = devm_regmap_init_i2c(client, &lm3639_regmap);
330 if (IS_ERR(pchip->regmap)) {
331 ret = PTR_ERR(pchip->regmap);
332 dev_err(&client->dev, "fail : allocate register map: %d\n",
333 ret);
334 return ret;
335 }
336 i2c_set_clientdata(client, pchip);
337
338
339 ret = lm3639_chip_init(pchip);
340 if (ret < 0) {
341 dev_err(&client->dev, "fail : chip init\n");
342 goto err_out;
343 }
344
345
346 props.type = BACKLIGHT_RAW;
347 props.brightness = pdata->init_brt_led;
348 props.max_brightness = pdata->max_brt_led;
349 pchip->bled =
350 devm_backlight_device_register(pchip->dev, "lm3639_bled",
351 pchip->dev, pchip, &lm3639_bled_ops,
352 &props);
353 if (IS_ERR(pchip->bled)) {
354 dev_err(&client->dev, "fail : backlight register\n");
355 ret = PTR_ERR(pchip->bled);
356 goto err_out;
357 }
358
359 ret = device_create_file(&(pchip->bled->dev), &dev_attr_bled_mode);
360 if (ret < 0) {
361 dev_err(&client->dev, "failed : add sysfs entries\n");
362 goto err_out;
363 }
364
365
366 pchip->cdev_flash.name = "lm3639_flash";
367 pchip->cdev_flash.max_brightness = 16;
368 pchip->cdev_flash.brightness_set = lm3639_flash_brightness_set;
369 ret = led_classdev_register((struct device *)
370 &client->dev, &pchip->cdev_flash);
371 if (ret < 0) {
372 dev_err(&client->dev, "fail : flash register\n");
373 goto err_flash;
374 }
375
376
377 pchip->cdev_torch.name = "lm3639_torch";
378 pchip->cdev_torch.max_brightness = 8;
379 pchip->cdev_torch.brightness_set = lm3639_torch_brightness_set;
380 ret = led_classdev_register((struct device *)
381 &client->dev, &pchip->cdev_torch);
382 if (ret < 0) {
383 dev_err(&client->dev, "fail : torch register\n");
384 goto err_torch;
385 }
386
387 return 0;
388
389err_torch:
390 led_classdev_unregister(&pchip->cdev_flash);
391err_flash:
392 device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode);
393err_out:
394 return ret;
395}
396
397static int lm3639_remove(struct i2c_client *client)
398{
399 struct lm3639_chip_data *pchip = i2c_get_clientdata(client);
400
401 regmap_write(pchip->regmap, REG_ENABLE, 0x00);
402
403 if (&pchip->cdev_torch)
404 led_classdev_unregister(&pchip->cdev_torch);
405 if (&pchip->cdev_flash)
406 led_classdev_unregister(&pchip->cdev_flash);
407 if (pchip->bled)
408 device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode);
409 return 0;
410}
411
412static const struct i2c_device_id lm3639_id[] = {
413 {LM3639_NAME, 0},
414 {}
415};
416
417MODULE_DEVICE_TABLE(i2c, lm3639_id);
418static struct i2c_driver lm3639_i2c_driver = {
419 .driver = {
420 .name = LM3639_NAME,
421 },
422 .probe = lm3639_probe,
423 .remove = lm3639_remove,
424 .id_table = lm3639_id,
425};
426
427module_i2c_driver(lm3639_i2c_driver);
428
429MODULE_DESCRIPTION("Texas Instruments Backlight+Flash LED driver for LM3639");
430MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
431MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
432MODULE_LICENSE("GPL v2");
433
