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b1e6b706 SKS |
1 | /* |
2 | * Copyright (C) 2011 ST-Ericsson SA. | |
3 | * Copyright (C) 2009 Motorola, Inc. | |
4 | * | |
5 | * License Terms: GNU General Public License v2 | |
6 | * | |
7 | * Simple driver for National Semiconductor LM3530 Backlight driver chip | |
8 | * | |
9 | * Author: Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com> | |
10 | * based on leds-lm3530.c by Dan Murphy <D.Murphy@motorola.com> | |
11 | */ | |
12 | ||
13 | #include <linux/i2c.h> | |
14 | #include <linux/leds.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/input.h> | |
18 | #include <linux/led-lm3530.h> | |
19 | #include <linux/types.h> | |
9b2da53f | 20 | #include <linux/regulator/consumer.h> |
54f4dedb | 21 | #include <linux/module.h> |
b1e6b706 SKS |
22 | |
23 | #define LM3530_LED_DEV "lcd-backlight" | |
24 | #define LM3530_NAME "lm3530-led" | |
25 | ||
26 | #define LM3530_GEN_CONFIG 0x10 | |
27 | #define LM3530_ALS_CONFIG 0x20 | |
28 | #define LM3530_BRT_RAMP_RATE 0x30 | |
29 | #define LM3530_ALS_ZONE_REG 0x40 | |
30 | #define LM3530_ALS_IMP_SELECT 0x41 | |
31 | #define LM3530_BRT_CTRL_REG 0xA0 | |
32 | #define LM3530_ALS_ZB0_REG 0x60 | |
33 | #define LM3530_ALS_ZB1_REG 0x61 | |
34 | #define LM3530_ALS_ZB2_REG 0x62 | |
35 | #define LM3530_ALS_ZB3_REG 0x63 | |
36 | #define LM3530_ALS_Z0T_REG 0x70 | |
37 | #define LM3530_ALS_Z1T_REG 0x71 | |
38 | #define LM3530_ALS_Z2T_REG 0x72 | |
39 | #define LM3530_ALS_Z3T_REG 0x73 | |
40 | #define LM3530_ALS_Z4T_REG 0x74 | |
41 | #define LM3530_REG_MAX 15 | |
42 | ||
43 | /* General Control Register */ | |
44 | #define LM3530_EN_I2C_SHIFT (0) | |
45 | #define LM3530_RAMP_LAW_SHIFT (1) | |
46 | #define LM3530_MAX_CURR_SHIFT (2) | |
47 | #define LM3530_EN_PWM_SHIFT (5) | |
48 | #define LM3530_PWM_POL_SHIFT (6) | |
49 | #define LM3530_EN_PWM_SIMPLE_SHIFT (7) | |
50 | ||
51 | #define LM3530_ENABLE_I2C (1 << LM3530_EN_I2C_SHIFT) | |
52 | #define LM3530_ENABLE_PWM (1 << LM3530_EN_PWM_SHIFT) | |
53 | #define LM3530_POL_LOW (1 << LM3530_PWM_POL_SHIFT) | |
54 | #define LM3530_ENABLE_PWM_SIMPLE (1 << LM3530_EN_PWM_SIMPLE_SHIFT) | |
55 | ||
56 | /* ALS Config Register Options */ | |
57 | #define LM3530_ALS_AVG_TIME_SHIFT (0) | |
58 | #define LM3530_EN_ALS_SHIFT (3) | |
59 | #define LM3530_ALS_SEL_SHIFT (5) | |
60 | ||
61 | #define LM3530_ENABLE_ALS (3 << LM3530_EN_ALS_SHIFT) | |
62 | ||
63 | /* Brightness Ramp Rate Register */ | |
64 | #define LM3530_BRT_RAMP_FALL_SHIFT (0) | |
65 | #define LM3530_BRT_RAMP_RISE_SHIFT (3) | |
66 | ||
67 | /* ALS Resistor Select */ | |
68 | #define LM3530_ALS1_IMP_SHIFT (0) | |
69 | #define LM3530_ALS2_IMP_SHIFT (4) | |
70 | ||
71 | /* Zone Boundary Register defaults */ | |
40b1445b SKS |
72 | #define LM3530_ALS_ZB_MAX (4) |
73 | #define LM3530_ALS_WINDOW_mV (1000) | |
74 | #define LM3530_ALS_OFFSET_mV (4) | |
b1e6b706 SKS |
75 | |
76 | /* Zone Target Register defaults */ | |
40b1445b SKS |
77 | #define LM3530_DEF_ZT_0 (0x7F) |
78 | #define LM3530_DEF_ZT_1 (0x66) | |
b1e6b706 | 79 | #define LM3530_DEF_ZT_2 (0x4C) |
40b1445b SKS |
80 | #define LM3530_DEF_ZT_3 (0x33) |
81 | #define LM3530_DEF_ZT_4 (0x19) | |
b1e6b706 SKS |
82 | |
83 | struct lm3530_mode_map { | |
84 | const char *mode; | |
85 | enum lm3530_mode mode_val; | |
86 | }; | |
87 | ||
88 | static struct lm3530_mode_map mode_map[] = { | |
89 | { "man", LM3530_BL_MODE_MANUAL }, | |
90 | { "als", LM3530_BL_MODE_ALS }, | |
91 | { "pwm", LM3530_BL_MODE_PWM }, | |
92 | }; | |
93 | ||
94 | /** | |
95 | * struct lm3530_data | |
96 | * @led_dev: led class device | |
97 | * @client: i2c client | |
98 | * @pdata: LM3530 platform data | |
99 | * @mode: mode of operation - manual, ALS, PWM | |
9b2da53f SKS |
100 | * @regulator: regulator |
101 | * @brighness: previous brightness value | |
102 | * @enable: regulator is enabled | |
b1e6b706 SKS |
103 | */ |
104 | struct lm3530_data { | |
105 | struct led_classdev led_dev; | |
106 | struct i2c_client *client; | |
107 | struct lm3530_platform_data *pdata; | |
108 | enum lm3530_mode mode; | |
9b2da53f SKS |
109 | struct regulator *regulator; |
110 | enum led_brightness brightness; | |
111 | bool enable; | |
b1e6b706 SKS |
112 | }; |
113 | ||
114 | static const u8 lm3530_reg[LM3530_REG_MAX] = { | |
115 | LM3530_GEN_CONFIG, | |
116 | LM3530_ALS_CONFIG, | |
117 | LM3530_BRT_RAMP_RATE, | |
118 | LM3530_ALS_ZONE_REG, | |
119 | LM3530_ALS_IMP_SELECT, | |
120 | LM3530_BRT_CTRL_REG, | |
121 | LM3530_ALS_ZB0_REG, | |
122 | LM3530_ALS_ZB1_REG, | |
123 | LM3530_ALS_ZB2_REG, | |
124 | LM3530_ALS_ZB3_REG, | |
125 | LM3530_ALS_Z0T_REG, | |
126 | LM3530_ALS_Z1T_REG, | |
127 | LM3530_ALS_Z2T_REG, | |
128 | LM3530_ALS_Z3T_REG, | |
129 | LM3530_ALS_Z4T_REG, | |
130 | }; | |
131 | ||
132 | static int lm3530_get_mode_from_str(const char *str) | |
133 | { | |
134 | int i; | |
135 | ||
136 | for (i = 0; i < ARRAY_SIZE(mode_map); i++) | |
137 | if (sysfs_streq(str, mode_map[i].mode)) | |
138 | return mode_map[i].mode_val; | |
139 | ||
140 | return -1; | |
141 | } | |
142 | ||
143 | static int lm3530_init_registers(struct lm3530_data *drvdata) | |
144 | { | |
145 | int ret = 0; | |
146 | int i; | |
147 | u8 gen_config; | |
148 | u8 als_config = 0; | |
149 | u8 brt_ramp; | |
150 | u8 als_imp_sel = 0; | |
151 | u8 brightness; | |
152 | u8 reg_val[LM3530_REG_MAX]; | |
40b1445b SKS |
153 | u8 zones[LM3530_ALS_ZB_MAX]; |
154 | u32 als_vmin, als_vmax, als_vstep; | |
b1e6b706 SKS |
155 | struct lm3530_platform_data *pltfm = drvdata->pdata; |
156 | struct i2c_client *client = drvdata->client; | |
157 | ||
158 | gen_config = (pltfm->brt_ramp_law << LM3530_RAMP_LAW_SHIFT) | | |
159 | ((pltfm->max_current & 7) << LM3530_MAX_CURR_SHIFT); | |
160 | ||
161 | if (drvdata->mode == LM3530_BL_MODE_MANUAL || | |
162 | drvdata->mode == LM3530_BL_MODE_ALS) | |
163 | gen_config |= (LM3530_ENABLE_I2C); | |
164 | ||
165 | if (drvdata->mode == LM3530_BL_MODE_ALS) { | |
40b1445b SKS |
166 | if (pltfm->als_vmax == 0) { |
167 | pltfm->als_vmin = als_vmin = 0; | |
168 | pltfm->als_vmin = als_vmax = LM3530_ALS_WINDOW_mV; | |
169 | } | |
170 | ||
171 | als_vmin = pltfm->als_vmin; | |
172 | als_vmax = pltfm->als_vmax; | |
173 | ||
174 | if ((als_vmax - als_vmin) > LM3530_ALS_WINDOW_mV) | |
175 | pltfm->als_vmax = als_vmax = | |
176 | als_vmin + LM3530_ALS_WINDOW_mV; | |
177 | ||
178 | /* n zone boundary makes n+1 zones */ | |
179 | als_vstep = (als_vmax - als_vmin) / (LM3530_ALS_ZB_MAX + 1); | |
180 | ||
181 | for (i = 0; i < LM3530_ALS_ZB_MAX; i++) | |
182 | zones[i] = (((als_vmin + LM3530_ALS_OFFSET_mV) + | |
183 | als_vstep + (i * als_vstep)) * LED_FULL) | |
184 | / 1000; | |
185 | ||
b1e6b706 SKS |
186 | als_config = |
187 | (pltfm->als_avrg_time << LM3530_ALS_AVG_TIME_SHIFT) | | |
188 | (LM3530_ENABLE_ALS) | | |
189 | (pltfm->als_input_mode << LM3530_ALS_SEL_SHIFT); | |
190 | ||
191 | als_imp_sel = | |
192 | (pltfm->als1_resistor_sel << LM3530_ALS1_IMP_SHIFT) | | |
193 | (pltfm->als2_resistor_sel << LM3530_ALS2_IMP_SHIFT); | |
40b1445b | 194 | |
b1e6b706 SKS |
195 | } |
196 | ||
197 | if (drvdata->mode == LM3530_BL_MODE_PWM) | |
198 | gen_config |= (LM3530_ENABLE_PWM) | | |
199 | (pltfm->pwm_pol_hi << LM3530_PWM_POL_SHIFT) | | |
200 | (LM3530_ENABLE_PWM_SIMPLE); | |
201 | ||
202 | brt_ramp = (pltfm->brt_ramp_fall << LM3530_BRT_RAMP_FALL_SHIFT) | | |
203 | (pltfm->brt_ramp_rise << LM3530_BRT_RAMP_RISE_SHIFT); | |
204 | ||
9b2da53f SKS |
205 | if (drvdata->brightness) |
206 | brightness = drvdata->brightness; | |
207 | else | |
208 | brightness = drvdata->brightness = pltfm->brt_val; | |
b1e6b706 SKS |
209 | |
210 | reg_val[0] = gen_config; /* LM3530_GEN_CONFIG */ | |
211 | reg_val[1] = als_config; /* LM3530_ALS_CONFIG */ | |
212 | reg_val[2] = brt_ramp; /* LM3530_BRT_RAMP_RATE */ | |
213 | reg_val[3] = 0x00; /* LM3530_ALS_ZONE_REG */ | |
214 | reg_val[4] = als_imp_sel; /* LM3530_ALS_IMP_SELECT */ | |
215 | reg_val[5] = brightness; /* LM3530_BRT_CTRL_REG */ | |
40b1445b SKS |
216 | reg_val[6] = zones[0]; /* LM3530_ALS_ZB0_REG */ |
217 | reg_val[7] = zones[1]; /* LM3530_ALS_ZB1_REG */ | |
218 | reg_val[8] = zones[2]; /* LM3530_ALS_ZB2_REG */ | |
219 | reg_val[9] = zones[3]; /* LM3530_ALS_ZB3_REG */ | |
b1e6b706 SKS |
220 | reg_val[10] = LM3530_DEF_ZT_0; /* LM3530_ALS_Z0T_REG */ |
221 | reg_val[11] = LM3530_DEF_ZT_1; /* LM3530_ALS_Z1T_REG */ | |
222 | reg_val[12] = LM3530_DEF_ZT_2; /* LM3530_ALS_Z2T_REG */ | |
223 | reg_val[13] = LM3530_DEF_ZT_3; /* LM3530_ALS_Z3T_REG */ | |
224 | reg_val[14] = LM3530_DEF_ZT_4; /* LM3530_ALS_Z4T_REG */ | |
225 | ||
9b2da53f SKS |
226 | if (!drvdata->enable) { |
227 | ret = regulator_enable(drvdata->regulator); | |
228 | if (ret) { | |
229 | dev_err(&drvdata->client->dev, | |
230 | "Enable regulator failed\n"); | |
231 | return ret; | |
232 | } | |
233 | drvdata->enable = true; | |
234 | } | |
235 | ||
b1e6b706 SKS |
236 | for (i = 0; i < LM3530_REG_MAX; i++) { |
237 | ret = i2c_smbus_write_byte_data(client, | |
238 | lm3530_reg[i], reg_val[i]); | |
239 | if (ret) | |
240 | break; | |
241 | } | |
242 | ||
243 | return ret; | |
244 | } | |
245 | ||
246 | static void lm3530_brightness_set(struct led_classdev *led_cdev, | |
247 | enum led_brightness brt_val) | |
248 | { | |
249 | int err; | |
250 | struct lm3530_data *drvdata = | |
251 | container_of(led_cdev, struct lm3530_data, led_dev); | |
252 | ||
253 | switch (drvdata->mode) { | |
254 | case LM3530_BL_MODE_MANUAL: | |
255 | ||
9b2da53f SKS |
256 | if (!drvdata->enable) { |
257 | err = lm3530_init_registers(drvdata); | |
258 | if (err) { | |
259 | dev_err(&drvdata->client->dev, | |
260 | "Register Init failed: %d\n", err); | |
261 | break; | |
262 | } | |
263 | } | |
264 | ||
b1e6b706 SKS |
265 | /* set the brightness in brightness control register*/ |
266 | err = i2c_smbus_write_byte_data(drvdata->client, | |
267 | LM3530_BRT_CTRL_REG, brt_val / 2); | |
268 | if (err) | |
269 | dev_err(&drvdata->client->dev, | |
270 | "Unable to set brightness: %d\n", err); | |
9b2da53f SKS |
271 | else |
272 | drvdata->brightness = brt_val / 2; | |
273 | ||
274 | if (brt_val == 0) { | |
275 | err = regulator_disable(drvdata->regulator); | |
276 | if (err) | |
277 | dev_err(&drvdata->client->dev, | |
278 | "Disable regulator failed\n"); | |
279 | drvdata->enable = false; | |
280 | } | |
b1e6b706 SKS |
281 | break; |
282 | case LM3530_BL_MODE_ALS: | |
283 | break; | |
284 | case LM3530_BL_MODE_PWM: | |
285 | break; | |
286 | default: | |
287 | break; | |
288 | } | |
289 | } | |
290 | ||
40b1445b SKS |
291 | static ssize_t lm3530_mode_get(struct device *dev, |
292 | struct device_attribute *attr, char *buf) | |
293 | { | |
294 | struct i2c_client *client = container_of( | |
295 | dev->parent, struct i2c_client, dev); | |
296 | struct lm3530_data *drvdata = i2c_get_clientdata(client); | |
297 | int i, len = 0; | |
298 | ||
299 | for (i = 0; i < ARRAY_SIZE(mode_map); i++) | |
300 | if (drvdata->mode == mode_map[i].mode_val) | |
301 | len += sprintf(buf + len, "[%s] ", mode_map[i].mode); | |
302 | else | |
303 | len += sprintf(buf + len, "%s ", mode_map[i].mode); | |
304 | ||
305 | len += sprintf(buf + len, "\n"); | |
306 | ||
307 | return len; | |
308 | } | |
b1e6b706 SKS |
309 | |
310 | static ssize_t lm3530_mode_set(struct device *dev, struct device_attribute | |
311 | *attr, const char *buf, size_t size) | |
312 | { | |
313 | int err; | |
314 | struct i2c_client *client = container_of( | |
315 | dev->parent, struct i2c_client, dev); | |
316 | struct lm3530_data *drvdata = i2c_get_clientdata(client); | |
317 | int mode; | |
318 | ||
319 | mode = lm3530_get_mode_from_str(buf); | |
320 | if (mode < 0) { | |
321 | dev_err(dev, "Invalid mode\n"); | |
322 | return -EINVAL; | |
323 | } | |
324 | ||
325 | if (mode == LM3530_BL_MODE_MANUAL) | |
326 | drvdata->mode = LM3530_BL_MODE_MANUAL; | |
327 | else if (mode == LM3530_BL_MODE_ALS) | |
328 | drvdata->mode = LM3530_BL_MODE_ALS; | |
329 | else if (mode == LM3530_BL_MODE_PWM) { | |
330 | dev_err(dev, "PWM mode not supported\n"); | |
331 | return -EINVAL; | |
332 | } | |
333 | ||
334 | err = lm3530_init_registers(drvdata); | |
335 | if (err) { | |
336 | dev_err(dev, "Setting %s Mode failed :%d\n", buf, err); | |
337 | return err; | |
338 | } | |
339 | ||
340 | return sizeof(drvdata->mode); | |
341 | } | |
40b1445b | 342 | static DEVICE_ATTR(mode, 0644, lm3530_mode_get, lm3530_mode_set); |
b1e6b706 SKS |
343 | |
344 | static int __devinit lm3530_probe(struct i2c_client *client, | |
345 | const struct i2c_device_id *id) | |
346 | { | |
347 | struct lm3530_platform_data *pdata = client->dev.platform_data; | |
348 | struct lm3530_data *drvdata; | |
349 | int err = 0; | |
350 | ||
351 | if (pdata == NULL) { | |
352 | dev_err(&client->dev, "platform data required\n"); | |
353 | err = -ENODEV; | |
354 | goto err_out; | |
355 | } | |
356 | ||
357 | /* BL mode */ | |
358 | if (pdata->mode > LM3530_BL_MODE_PWM) { | |
359 | dev_err(&client->dev, "Illegal Mode request\n"); | |
360 | err = -EINVAL; | |
361 | goto err_out; | |
362 | } | |
363 | ||
364 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
365 | dev_err(&client->dev, "I2C_FUNC_I2C not supported\n"); | |
366 | err = -EIO; | |
367 | goto err_out; | |
368 | } | |
369 | ||
370 | drvdata = kzalloc(sizeof(struct lm3530_data), GFP_KERNEL); | |
371 | if (drvdata == NULL) { | |
372 | err = -ENOMEM; | |
373 | goto err_out; | |
374 | } | |
375 | ||
376 | drvdata->mode = pdata->mode; | |
377 | drvdata->client = client; | |
378 | drvdata->pdata = pdata; | |
9b2da53f SKS |
379 | drvdata->brightness = LED_OFF; |
380 | drvdata->enable = false; | |
b1e6b706 SKS |
381 | drvdata->led_dev.name = LM3530_LED_DEV; |
382 | drvdata->led_dev.brightness_set = lm3530_brightness_set; | |
383 | ||
384 | i2c_set_clientdata(client, drvdata); | |
385 | ||
9b2da53f SKS |
386 | drvdata->regulator = regulator_get(&client->dev, "vin"); |
387 | if (IS_ERR(drvdata->regulator)) { | |
388 | dev_err(&client->dev, "regulator get failed\n"); | |
389 | err = PTR_ERR(drvdata->regulator); | |
390 | drvdata->regulator = NULL; | |
391 | goto err_regulator_get; | |
b1e6b706 SKS |
392 | } |
393 | ||
9b2da53f SKS |
394 | if (drvdata->pdata->brt_val) { |
395 | err = lm3530_init_registers(drvdata); | |
396 | if (err < 0) { | |
397 | dev_err(&client->dev, | |
398 | "Register Init failed: %d\n", err); | |
399 | err = -ENODEV; | |
400 | goto err_reg_init; | |
401 | } | |
402 | } | |
403 | err = led_classdev_register(&client->dev, &drvdata->led_dev); | |
b1e6b706 SKS |
404 | if (err < 0) { |
405 | dev_err(&client->dev, "Register led class failed: %d\n", err); | |
406 | err = -ENODEV; | |
407 | goto err_class_register; | |
408 | } | |
409 | ||
410 | err = device_create_file(drvdata->led_dev.dev, &dev_attr_mode); | |
411 | if (err < 0) { | |
412 | dev_err(&client->dev, "File device creation failed: %d\n", err); | |
413 | err = -ENODEV; | |
414 | goto err_create_file; | |
415 | } | |
416 | ||
417 | return 0; | |
418 | ||
419 | err_create_file: | |
420 | led_classdev_unregister(&drvdata->led_dev); | |
421 | err_class_register: | |
422 | err_reg_init: | |
9b2da53f SKS |
423 | regulator_put(drvdata->regulator); |
424 | err_regulator_get: | |
b1e6b706 SKS |
425 | kfree(drvdata); |
426 | err_out: | |
427 | return err; | |
428 | } | |
429 | ||
430 | static int __devexit lm3530_remove(struct i2c_client *client) | |
431 | { | |
432 | struct lm3530_data *drvdata = i2c_get_clientdata(client); | |
433 | ||
434 | device_remove_file(drvdata->led_dev.dev, &dev_attr_mode); | |
9b2da53f SKS |
435 | |
436 | if (drvdata->enable) | |
437 | regulator_disable(drvdata->regulator); | |
438 | regulator_put(drvdata->regulator); | |
b1e6b706 SKS |
439 | led_classdev_unregister(&drvdata->led_dev); |
440 | kfree(drvdata); | |
441 | return 0; | |
442 | } | |
443 | ||
444 | static const struct i2c_device_id lm3530_id[] = { | |
445 | {LM3530_NAME, 0}, | |
446 | {} | |
447 | }; | |
d5f33d45 | 448 | MODULE_DEVICE_TABLE(i2c, lm3530_id); |
b1e6b706 SKS |
449 | |
450 | static struct i2c_driver lm3530_i2c_driver = { | |
451 | .probe = lm3530_probe, | |
93f53982 | 452 | .remove = __devexit_p(lm3530_remove), |
b1e6b706 SKS |
453 | .id_table = lm3530_id, |
454 | .driver = { | |
455 | .name = LM3530_NAME, | |
456 | .owner = THIS_MODULE, | |
457 | }, | |
458 | }; | |
459 | ||
460 | static int __init lm3530_init(void) | |
461 | { | |
462 | return i2c_add_driver(&lm3530_i2c_driver); | |
463 | } | |
464 | ||
465 | static void __exit lm3530_exit(void) | |
466 | { | |
467 | i2c_del_driver(&lm3530_i2c_driver); | |
468 | } | |
469 | ||
470 | module_init(lm3530_init); | |
471 | module_exit(lm3530_exit); | |
472 | ||
473 | MODULE_DESCRIPTION("Back Light driver for LM3530"); | |
474 | MODULE_LICENSE("GPL v2"); | |
475 | MODULE_AUTHOR("Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>"); |