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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> |
b1e6b706 SKS |
21 | |
22 | #define LM3530_LED_DEV "lcd-backlight" | |
23 | #define LM3530_NAME "lm3530-led" | |
24 | ||
25 | #define LM3530_GEN_CONFIG 0x10 | |
26 | #define LM3530_ALS_CONFIG 0x20 | |
27 | #define LM3530_BRT_RAMP_RATE 0x30 | |
28 | #define LM3530_ALS_ZONE_REG 0x40 | |
29 | #define LM3530_ALS_IMP_SELECT 0x41 | |
30 | #define LM3530_BRT_CTRL_REG 0xA0 | |
31 | #define LM3530_ALS_ZB0_REG 0x60 | |
32 | #define LM3530_ALS_ZB1_REG 0x61 | |
33 | #define LM3530_ALS_ZB2_REG 0x62 | |
34 | #define LM3530_ALS_ZB3_REG 0x63 | |
35 | #define LM3530_ALS_Z0T_REG 0x70 | |
36 | #define LM3530_ALS_Z1T_REG 0x71 | |
37 | #define LM3530_ALS_Z2T_REG 0x72 | |
38 | #define LM3530_ALS_Z3T_REG 0x73 | |
39 | #define LM3530_ALS_Z4T_REG 0x74 | |
40 | #define LM3530_REG_MAX 15 | |
41 | ||
42 | /* General Control Register */ | |
43 | #define LM3530_EN_I2C_SHIFT (0) | |
44 | #define LM3530_RAMP_LAW_SHIFT (1) | |
45 | #define LM3530_MAX_CURR_SHIFT (2) | |
46 | #define LM3530_EN_PWM_SHIFT (5) | |
47 | #define LM3530_PWM_POL_SHIFT (6) | |
48 | #define LM3530_EN_PWM_SIMPLE_SHIFT (7) | |
49 | ||
50 | #define LM3530_ENABLE_I2C (1 << LM3530_EN_I2C_SHIFT) | |
51 | #define LM3530_ENABLE_PWM (1 << LM3530_EN_PWM_SHIFT) | |
52 | #define LM3530_POL_LOW (1 << LM3530_PWM_POL_SHIFT) | |
53 | #define LM3530_ENABLE_PWM_SIMPLE (1 << LM3530_EN_PWM_SIMPLE_SHIFT) | |
54 | ||
55 | /* ALS Config Register Options */ | |
56 | #define LM3530_ALS_AVG_TIME_SHIFT (0) | |
57 | #define LM3530_EN_ALS_SHIFT (3) | |
58 | #define LM3530_ALS_SEL_SHIFT (5) | |
59 | ||
60 | #define LM3530_ENABLE_ALS (3 << LM3530_EN_ALS_SHIFT) | |
61 | ||
62 | /* Brightness Ramp Rate Register */ | |
63 | #define LM3530_BRT_RAMP_FALL_SHIFT (0) | |
64 | #define LM3530_BRT_RAMP_RISE_SHIFT (3) | |
65 | ||
66 | /* ALS Resistor Select */ | |
67 | #define LM3530_ALS1_IMP_SHIFT (0) | |
68 | #define LM3530_ALS2_IMP_SHIFT (4) | |
69 | ||
70 | /* Zone Boundary Register defaults */ | |
71 | #define LM3530_DEF_ZB_0 (0x33) | |
72 | #define LM3530_DEF_ZB_1 (0x66) | |
73 | #define LM3530_DEF_ZB_2 (0x99) | |
74 | #define LM3530_DEF_ZB_3 (0xCC) | |
75 | ||
76 | /* Zone Target Register defaults */ | |
77 | #define LM3530_DEF_ZT_0 (0x19) | |
78 | #define LM3530_DEF_ZT_1 (0x33) | |
79 | #define LM3530_DEF_ZT_2 (0x4C) | |
80 | #define LM3530_DEF_ZT_3 (0x66) | |
81 | #define LM3530_DEF_ZT_4 (0x7F) | |
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]; | |
153 | struct lm3530_platform_data *pltfm = drvdata->pdata; | |
154 | struct i2c_client *client = drvdata->client; | |
155 | ||
156 | gen_config = (pltfm->brt_ramp_law << LM3530_RAMP_LAW_SHIFT) | | |
157 | ((pltfm->max_current & 7) << LM3530_MAX_CURR_SHIFT); | |
158 | ||
159 | if (drvdata->mode == LM3530_BL_MODE_MANUAL || | |
160 | drvdata->mode == LM3530_BL_MODE_ALS) | |
161 | gen_config |= (LM3530_ENABLE_I2C); | |
162 | ||
163 | if (drvdata->mode == LM3530_BL_MODE_ALS) { | |
164 | als_config = | |
165 | (pltfm->als_avrg_time << LM3530_ALS_AVG_TIME_SHIFT) | | |
166 | (LM3530_ENABLE_ALS) | | |
167 | (pltfm->als_input_mode << LM3530_ALS_SEL_SHIFT); | |
168 | ||
169 | als_imp_sel = | |
170 | (pltfm->als1_resistor_sel << LM3530_ALS1_IMP_SHIFT) | | |
171 | (pltfm->als2_resistor_sel << LM3530_ALS2_IMP_SHIFT); | |
172 | } | |
173 | ||
174 | if (drvdata->mode == LM3530_BL_MODE_PWM) | |
175 | gen_config |= (LM3530_ENABLE_PWM) | | |
176 | (pltfm->pwm_pol_hi << LM3530_PWM_POL_SHIFT) | | |
177 | (LM3530_ENABLE_PWM_SIMPLE); | |
178 | ||
179 | brt_ramp = (pltfm->brt_ramp_fall << LM3530_BRT_RAMP_FALL_SHIFT) | | |
180 | (pltfm->brt_ramp_rise << LM3530_BRT_RAMP_RISE_SHIFT); | |
181 | ||
9b2da53f SKS |
182 | if (drvdata->brightness) |
183 | brightness = drvdata->brightness; | |
184 | else | |
185 | brightness = drvdata->brightness = pltfm->brt_val; | |
b1e6b706 SKS |
186 | |
187 | reg_val[0] = gen_config; /* LM3530_GEN_CONFIG */ | |
188 | reg_val[1] = als_config; /* LM3530_ALS_CONFIG */ | |
189 | reg_val[2] = brt_ramp; /* LM3530_BRT_RAMP_RATE */ | |
190 | reg_val[3] = 0x00; /* LM3530_ALS_ZONE_REG */ | |
191 | reg_val[4] = als_imp_sel; /* LM3530_ALS_IMP_SELECT */ | |
192 | reg_val[5] = brightness; /* LM3530_BRT_CTRL_REG */ | |
193 | reg_val[6] = LM3530_DEF_ZB_0; /* LM3530_ALS_ZB0_REG */ | |
194 | reg_val[7] = LM3530_DEF_ZB_1; /* LM3530_ALS_ZB1_REG */ | |
195 | reg_val[8] = LM3530_DEF_ZB_2; /* LM3530_ALS_ZB2_REG */ | |
196 | reg_val[9] = LM3530_DEF_ZB_3; /* LM3530_ALS_ZB3_REG */ | |
197 | reg_val[10] = LM3530_DEF_ZT_0; /* LM3530_ALS_Z0T_REG */ | |
198 | reg_val[11] = LM3530_DEF_ZT_1; /* LM3530_ALS_Z1T_REG */ | |
199 | reg_val[12] = LM3530_DEF_ZT_2; /* LM3530_ALS_Z2T_REG */ | |
200 | reg_val[13] = LM3530_DEF_ZT_3; /* LM3530_ALS_Z3T_REG */ | |
201 | reg_val[14] = LM3530_DEF_ZT_4; /* LM3530_ALS_Z4T_REG */ | |
202 | ||
9b2da53f SKS |
203 | if (!drvdata->enable) { |
204 | ret = regulator_enable(drvdata->regulator); | |
205 | if (ret) { | |
206 | dev_err(&drvdata->client->dev, | |
207 | "Enable regulator failed\n"); | |
208 | return ret; | |
209 | } | |
210 | drvdata->enable = true; | |
211 | } | |
212 | ||
b1e6b706 SKS |
213 | for (i = 0; i < LM3530_REG_MAX; i++) { |
214 | ret = i2c_smbus_write_byte_data(client, | |
215 | lm3530_reg[i], reg_val[i]); | |
216 | if (ret) | |
217 | break; | |
218 | } | |
219 | ||
220 | return ret; | |
221 | } | |
222 | ||
223 | static void lm3530_brightness_set(struct led_classdev *led_cdev, | |
224 | enum led_brightness brt_val) | |
225 | { | |
226 | int err; | |
227 | struct lm3530_data *drvdata = | |
228 | container_of(led_cdev, struct lm3530_data, led_dev); | |
229 | ||
230 | switch (drvdata->mode) { | |
231 | case LM3530_BL_MODE_MANUAL: | |
232 | ||
9b2da53f SKS |
233 | if (!drvdata->enable) { |
234 | err = lm3530_init_registers(drvdata); | |
235 | if (err) { | |
236 | dev_err(&drvdata->client->dev, | |
237 | "Register Init failed: %d\n", err); | |
238 | break; | |
239 | } | |
240 | } | |
241 | ||
b1e6b706 SKS |
242 | /* set the brightness in brightness control register*/ |
243 | err = i2c_smbus_write_byte_data(drvdata->client, | |
244 | LM3530_BRT_CTRL_REG, brt_val / 2); | |
245 | if (err) | |
246 | dev_err(&drvdata->client->dev, | |
247 | "Unable to set brightness: %d\n", err); | |
9b2da53f SKS |
248 | else |
249 | drvdata->brightness = brt_val / 2; | |
250 | ||
251 | if (brt_val == 0) { | |
252 | err = regulator_disable(drvdata->regulator); | |
253 | if (err) | |
254 | dev_err(&drvdata->client->dev, | |
255 | "Disable regulator failed\n"); | |
256 | drvdata->enable = false; | |
257 | } | |
b1e6b706 SKS |
258 | break; |
259 | case LM3530_BL_MODE_ALS: | |
260 | break; | |
261 | case LM3530_BL_MODE_PWM: | |
262 | break; | |
263 | default: | |
264 | break; | |
265 | } | |
266 | } | |
267 | ||
268 | ||
269 | static ssize_t lm3530_mode_set(struct device *dev, struct device_attribute | |
270 | *attr, const char *buf, size_t size) | |
271 | { | |
272 | int err; | |
273 | struct i2c_client *client = container_of( | |
274 | dev->parent, struct i2c_client, dev); | |
275 | struct lm3530_data *drvdata = i2c_get_clientdata(client); | |
276 | int mode; | |
277 | ||
278 | mode = lm3530_get_mode_from_str(buf); | |
279 | if (mode < 0) { | |
280 | dev_err(dev, "Invalid mode\n"); | |
281 | return -EINVAL; | |
282 | } | |
283 | ||
284 | if (mode == LM3530_BL_MODE_MANUAL) | |
285 | drvdata->mode = LM3530_BL_MODE_MANUAL; | |
286 | else if (mode == LM3530_BL_MODE_ALS) | |
287 | drvdata->mode = LM3530_BL_MODE_ALS; | |
288 | else if (mode == LM3530_BL_MODE_PWM) { | |
289 | dev_err(dev, "PWM mode not supported\n"); | |
290 | return -EINVAL; | |
291 | } | |
292 | ||
293 | err = lm3530_init_registers(drvdata); | |
294 | if (err) { | |
295 | dev_err(dev, "Setting %s Mode failed :%d\n", buf, err); | |
296 | return err; | |
297 | } | |
298 | ||
299 | return sizeof(drvdata->mode); | |
300 | } | |
301 | ||
302 | static DEVICE_ATTR(mode, 0644, NULL, lm3530_mode_set); | |
303 | ||
304 | static int __devinit lm3530_probe(struct i2c_client *client, | |
305 | const struct i2c_device_id *id) | |
306 | { | |
307 | struct lm3530_platform_data *pdata = client->dev.platform_data; | |
308 | struct lm3530_data *drvdata; | |
309 | int err = 0; | |
310 | ||
311 | if (pdata == NULL) { | |
312 | dev_err(&client->dev, "platform data required\n"); | |
313 | err = -ENODEV; | |
314 | goto err_out; | |
315 | } | |
316 | ||
317 | /* BL mode */ | |
318 | if (pdata->mode > LM3530_BL_MODE_PWM) { | |
319 | dev_err(&client->dev, "Illegal Mode request\n"); | |
320 | err = -EINVAL; | |
321 | goto err_out; | |
322 | } | |
323 | ||
324 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
325 | dev_err(&client->dev, "I2C_FUNC_I2C not supported\n"); | |
326 | err = -EIO; | |
327 | goto err_out; | |
328 | } | |
329 | ||
330 | drvdata = kzalloc(sizeof(struct lm3530_data), GFP_KERNEL); | |
331 | if (drvdata == NULL) { | |
332 | err = -ENOMEM; | |
333 | goto err_out; | |
334 | } | |
335 | ||
336 | drvdata->mode = pdata->mode; | |
337 | drvdata->client = client; | |
338 | drvdata->pdata = pdata; | |
9b2da53f SKS |
339 | drvdata->brightness = LED_OFF; |
340 | drvdata->enable = false; | |
b1e6b706 SKS |
341 | drvdata->led_dev.name = LM3530_LED_DEV; |
342 | drvdata->led_dev.brightness_set = lm3530_brightness_set; | |
343 | ||
344 | i2c_set_clientdata(client, drvdata); | |
345 | ||
9b2da53f SKS |
346 | drvdata->regulator = regulator_get(&client->dev, "vin"); |
347 | if (IS_ERR(drvdata->regulator)) { | |
348 | dev_err(&client->dev, "regulator get failed\n"); | |
349 | err = PTR_ERR(drvdata->regulator); | |
350 | drvdata->regulator = NULL; | |
351 | goto err_regulator_get; | |
b1e6b706 SKS |
352 | } |
353 | ||
9b2da53f SKS |
354 | if (drvdata->pdata->brt_val) { |
355 | err = lm3530_init_registers(drvdata); | |
356 | if (err < 0) { | |
357 | dev_err(&client->dev, | |
358 | "Register Init failed: %d\n", err); | |
359 | err = -ENODEV; | |
360 | goto err_reg_init; | |
361 | } | |
362 | } | |
363 | err = led_classdev_register(&client->dev, &drvdata->led_dev); | |
b1e6b706 SKS |
364 | if (err < 0) { |
365 | dev_err(&client->dev, "Register led class failed: %d\n", err); | |
366 | err = -ENODEV; | |
367 | goto err_class_register; | |
368 | } | |
369 | ||
370 | err = device_create_file(drvdata->led_dev.dev, &dev_attr_mode); | |
371 | if (err < 0) { | |
372 | dev_err(&client->dev, "File device creation failed: %d\n", err); | |
373 | err = -ENODEV; | |
374 | goto err_create_file; | |
375 | } | |
376 | ||
377 | return 0; | |
378 | ||
379 | err_create_file: | |
380 | led_classdev_unregister(&drvdata->led_dev); | |
381 | err_class_register: | |
382 | err_reg_init: | |
9b2da53f SKS |
383 | regulator_put(drvdata->regulator); |
384 | err_regulator_get: | |
385 | i2c_set_clientdata(client, NULL); | |
b1e6b706 SKS |
386 | kfree(drvdata); |
387 | err_out: | |
388 | return err; | |
389 | } | |
390 | ||
391 | static int __devexit lm3530_remove(struct i2c_client *client) | |
392 | { | |
393 | struct lm3530_data *drvdata = i2c_get_clientdata(client); | |
394 | ||
395 | device_remove_file(drvdata->led_dev.dev, &dev_attr_mode); | |
9b2da53f SKS |
396 | |
397 | if (drvdata->enable) | |
398 | regulator_disable(drvdata->regulator); | |
399 | regulator_put(drvdata->regulator); | |
b1e6b706 SKS |
400 | led_classdev_unregister(&drvdata->led_dev); |
401 | kfree(drvdata); | |
402 | return 0; | |
403 | } | |
404 | ||
405 | static const struct i2c_device_id lm3530_id[] = { | |
406 | {LM3530_NAME, 0}, | |
407 | {} | |
408 | }; | |
d5f33d45 | 409 | MODULE_DEVICE_TABLE(i2c, lm3530_id); |
b1e6b706 SKS |
410 | |
411 | static struct i2c_driver lm3530_i2c_driver = { | |
412 | .probe = lm3530_probe, | |
413 | .remove = lm3530_remove, | |
414 | .id_table = lm3530_id, | |
415 | .driver = { | |
416 | .name = LM3530_NAME, | |
417 | .owner = THIS_MODULE, | |
418 | }, | |
419 | }; | |
420 | ||
421 | static int __init lm3530_init(void) | |
422 | { | |
423 | return i2c_add_driver(&lm3530_i2c_driver); | |
424 | } | |
425 | ||
426 | static void __exit lm3530_exit(void) | |
427 | { | |
428 | i2c_del_driver(&lm3530_i2c_driver); | |
429 | } | |
430 | ||
431 | module_init(lm3530_init); | |
432 | module_exit(lm3530_exit); | |
433 | ||
434 | MODULE_DESCRIPTION("Back Light driver for LM3530"); | |
435 | MODULE_LICENSE("GPL v2"); | |
436 | MODULE_AUTHOR("Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>"); |