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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2011 ST-Ericsson SA.
4 * Copyright (C) 2009 Motorola, Inc.
5 *
6 * Simple driver for National Semiconductor LM3530 Backlight driver chip
7 *
8 * Author: Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>
9 * based on leds-lm3530.c by Dan Murphy <D.Murphy@motorola.com>
10 */
11
12#include <linux/i2c.h>
13#include <linux/leds.h>
14#include <linux/slab.h>
15#include <linux/platform_device.h>
16#include <linux/input.h>
17#include <linux/led-lm3530.h>
18#include <linux/types.h>
19#include <linux/regulator/consumer.h>
20#include <linux/module.h>
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_IMP_SELECT 0x41
29#define LM3530_BRT_CTRL_REG 0xA0
30#define LM3530_ALS_ZB0_REG 0x60
31#define LM3530_ALS_ZB1_REG 0x61
32#define LM3530_ALS_ZB2_REG 0x62
33#define LM3530_ALS_ZB3_REG 0x63
34#define LM3530_ALS_Z0T_REG 0x70
35#define LM3530_ALS_Z1T_REG 0x71
36#define LM3530_ALS_Z2T_REG 0x72
37#define LM3530_ALS_Z3T_REG 0x73
38#define LM3530_ALS_Z4T_REG 0x74
39#define LM3530_REG_MAX 14
40
41/* General Control Register */
42#define LM3530_EN_I2C_SHIFT (0)
43#define LM3530_RAMP_LAW_SHIFT (1)
44#define LM3530_MAX_CURR_SHIFT (2)
45#define LM3530_EN_PWM_SHIFT (5)
46#define LM3530_PWM_POL_SHIFT (6)
47#define LM3530_EN_PWM_SIMPLE_SHIFT (7)
48
49#define LM3530_ENABLE_I2C (1 << LM3530_EN_I2C_SHIFT)
50#define LM3530_ENABLE_PWM (1 << LM3530_EN_PWM_SHIFT)
51#define LM3530_POL_LOW (1 << LM3530_PWM_POL_SHIFT)
52#define LM3530_ENABLE_PWM_SIMPLE (1 << LM3530_EN_PWM_SIMPLE_SHIFT)
53
54/* ALS Config Register Options */
55#define LM3530_ALS_AVG_TIME_SHIFT (0)
56#define LM3530_EN_ALS_SHIFT (3)
57#define LM3530_ALS_SEL_SHIFT (5)
58
59#define LM3530_ENABLE_ALS (3 << LM3530_EN_ALS_SHIFT)
60
61/* Brightness Ramp Rate Register */
62#define LM3530_BRT_RAMP_FALL_SHIFT (0)
63#define LM3530_BRT_RAMP_RISE_SHIFT (3)
64
65/* ALS Resistor Select */
66#define LM3530_ALS1_IMP_SHIFT (0)
67#define LM3530_ALS2_IMP_SHIFT (4)
68
69/* Zone Boundary Register defaults */
70#define LM3530_ALS_ZB_MAX (4)
71#define LM3530_ALS_WINDOW_mV (1000)
72#define LM3530_ALS_OFFSET_mV (4)
73
74/* Zone Target Register defaults */
75#define LM3530_DEF_ZT_0 (0x7F)
76#define LM3530_DEF_ZT_1 (0x66)
77#define LM3530_DEF_ZT_2 (0x4C)
78#define LM3530_DEF_ZT_3 (0x33)
79#define LM3530_DEF_ZT_4 (0x19)
80
81/* 7 bits are used for the brightness : LM3530_BRT_CTRL_REG */
82#define MAX_BRIGHTNESS (127)
83
84struct lm3530_mode_map {
85 const char *mode;
86 enum lm3530_mode mode_val;
87};
88
89static struct lm3530_mode_map mode_map[] = {
90 { "man", LM3530_BL_MODE_MANUAL },
91 { "als", LM3530_BL_MODE_ALS },
92 { "pwm", LM3530_BL_MODE_PWM },
93};
94
95/**
96 * struct lm3530_data
97 * @led_dev: led class device
98 * @client: i2c client
99 * @pdata: LM3530 platform data
100 * @mode: mode of operation - manual, ALS, PWM
101 * @regulator: regulator
102 * @brightness: previous brightness value
103 * @enable: regulator is enabled
104 */
105struct lm3530_data {
106 struct led_classdev led_dev;
107 struct i2c_client *client;
108 struct lm3530_platform_data *pdata;
109 enum lm3530_mode mode;
110 struct regulator *regulator;
111 enum led_brightness brightness;
112 bool enable;
113};
114
115/*
116 * struct lm3530_als_data
117 * @config : value of ALS configuration register
118 * @imp_sel : value of ALS resistor select register
119 * @zone : values of ALS ZB(Zone Boundary) registers
120 */
121struct lm3530_als_data {
122 u8 config;
123 u8 imp_sel;
124 u8 zones[LM3530_ALS_ZB_MAX];
125};
126
127static const u8 lm3530_reg[LM3530_REG_MAX] = {
128 LM3530_GEN_CONFIG,
129 LM3530_ALS_CONFIG,
130 LM3530_BRT_RAMP_RATE,
131 LM3530_ALS_IMP_SELECT,
132 LM3530_BRT_CTRL_REG,
133 LM3530_ALS_ZB0_REG,
134 LM3530_ALS_ZB1_REG,
135 LM3530_ALS_ZB2_REG,
136 LM3530_ALS_ZB3_REG,
137 LM3530_ALS_Z0T_REG,
138 LM3530_ALS_Z1T_REG,
139 LM3530_ALS_Z2T_REG,
140 LM3530_ALS_Z3T_REG,
141 LM3530_ALS_Z4T_REG,
142};
143
144static int lm3530_get_mode_from_str(const char *str)
145{
146 int i;
147
148 for (i = 0; i < ARRAY_SIZE(mode_map); i++)
149 if (sysfs_streq(str, mode_map[i].mode))
150 return mode_map[i].mode_val;
151
152 return -EINVAL;
153}
154
155static void lm3530_als_configure(struct lm3530_platform_data *pdata,
156 struct lm3530_als_data *als)
157{
158 int i;
159 u32 als_vmin, als_vmax, als_vstep;
160
161 if (pdata->als_vmax == 0) {
162 pdata->als_vmin = 0;
163 pdata->als_vmax = LM3530_ALS_WINDOW_mV;
164 }
165
166 als_vmin = pdata->als_vmin;
167 als_vmax = pdata->als_vmax;
168
169 if ((als_vmax - als_vmin) > LM3530_ALS_WINDOW_mV)
170 pdata->als_vmax = als_vmax = als_vmin + LM3530_ALS_WINDOW_mV;
171
172 /* n zone boundary makes n+1 zones */
173 als_vstep = (als_vmax - als_vmin) / (LM3530_ALS_ZB_MAX + 1);
174
175 for (i = 0; i < LM3530_ALS_ZB_MAX; i++)
176 als->zones[i] = (((als_vmin + LM3530_ALS_OFFSET_mV) +
177 als_vstep + (i * als_vstep)) * LED_FULL) / 1000;
178
179 als->config =
180 (pdata->als_avrg_time << LM3530_ALS_AVG_TIME_SHIFT) |
181 (LM3530_ENABLE_ALS) |
182 (pdata->als_input_mode << LM3530_ALS_SEL_SHIFT);
183
184 als->imp_sel =
185 (pdata->als1_resistor_sel << LM3530_ALS1_IMP_SHIFT) |
186 (pdata->als2_resistor_sel << LM3530_ALS2_IMP_SHIFT);
187}
188
189static int lm3530_led_enable(struct lm3530_data *drvdata)
190{
191 int ret;
192
193 if (drvdata->enable)
194 return 0;
195
196 ret = regulator_enable(drvdata->regulator);
197 if (ret) {
198 dev_err(drvdata->led_dev.dev, "Failed to enable vin:%d\n", ret);
199 return ret;
200 }
201
202 drvdata->enable = true;
203 return 0;
204}
205
206static void lm3530_led_disable(struct lm3530_data *drvdata)
207{
208 int ret;
209
210 if (!drvdata->enable)
211 return;
212
213 ret = regulator_disable(drvdata->regulator);
214 if (ret) {
215 dev_err(drvdata->led_dev.dev, "Failed to disable vin:%d\n",
216 ret);
217 return;
218 }
219
220 drvdata->enable = false;
221}
222
223static int lm3530_init_registers(struct lm3530_data *drvdata)
224{
225 int ret = 0;
226 int i;
227 u8 gen_config;
228 u8 brt_ramp;
229 u8 brightness;
230 u8 reg_val[LM3530_REG_MAX];
231 struct lm3530_platform_data *pdata = drvdata->pdata;
232 struct i2c_client *client = drvdata->client;
233 struct lm3530_pwm_data *pwm = &pdata->pwm_data;
234 struct lm3530_als_data als;
235
236 memset(&als, 0, sizeof(struct lm3530_als_data));
237
238 gen_config = (pdata->brt_ramp_law << LM3530_RAMP_LAW_SHIFT) |
239 ((pdata->max_current & 7) << LM3530_MAX_CURR_SHIFT);
240
241 switch (drvdata->mode) {
242 case LM3530_BL_MODE_MANUAL:
243 gen_config |= LM3530_ENABLE_I2C;
244 break;
245 case LM3530_BL_MODE_ALS:
246 gen_config |= LM3530_ENABLE_I2C;
247 lm3530_als_configure(pdata, &als);
248 break;
249 case LM3530_BL_MODE_PWM:
250 gen_config |= LM3530_ENABLE_PWM | LM3530_ENABLE_PWM_SIMPLE |
251 (pdata->pwm_pol_hi << LM3530_PWM_POL_SHIFT);
252 break;
253 }
254
255 brt_ramp = (pdata->brt_ramp_fall << LM3530_BRT_RAMP_FALL_SHIFT) |
256 (pdata->brt_ramp_rise << LM3530_BRT_RAMP_RISE_SHIFT);
257
258 if (drvdata->brightness)
259 brightness = drvdata->brightness;
260 else
261 brightness = drvdata->brightness = pdata->brt_val;
262
263 if (brightness > drvdata->led_dev.max_brightness)
264 brightness = drvdata->led_dev.max_brightness;
265
266 reg_val[0] = gen_config; /* LM3530_GEN_CONFIG */
267 reg_val[1] = als.config; /* LM3530_ALS_CONFIG */
268 reg_val[2] = brt_ramp; /* LM3530_BRT_RAMP_RATE */
269 reg_val[3] = als.imp_sel; /* LM3530_ALS_IMP_SELECT */
270 reg_val[4] = brightness; /* LM3530_BRT_CTRL_REG */
271 reg_val[5] = als.zones[0]; /* LM3530_ALS_ZB0_REG */
272 reg_val[6] = als.zones[1]; /* LM3530_ALS_ZB1_REG */
273 reg_val[7] = als.zones[2]; /* LM3530_ALS_ZB2_REG */
274 reg_val[8] = als.zones[3]; /* LM3530_ALS_ZB3_REG */
275 reg_val[9] = LM3530_DEF_ZT_0; /* LM3530_ALS_Z0T_REG */
276 reg_val[10] = LM3530_DEF_ZT_1; /* LM3530_ALS_Z1T_REG */
277 reg_val[11] = LM3530_DEF_ZT_2; /* LM3530_ALS_Z2T_REG */
278 reg_val[12] = LM3530_DEF_ZT_3; /* LM3530_ALS_Z3T_REG */
279 reg_val[13] = LM3530_DEF_ZT_4; /* LM3530_ALS_Z4T_REG */
280
281 ret = lm3530_led_enable(drvdata);
282 if (ret)
283 return ret;
284
285 for (i = 0; i < LM3530_REG_MAX; i++) {
286 /* do not update brightness register when pwm mode */
287 if (lm3530_reg[i] == LM3530_BRT_CTRL_REG &&
288 drvdata->mode == LM3530_BL_MODE_PWM) {
289 if (pwm->pwm_set_intensity)
290 pwm->pwm_set_intensity(reg_val[i],
291 drvdata->led_dev.max_brightness);
292 continue;
293 }
294
295 ret = i2c_smbus_write_byte_data(client,
296 lm3530_reg[i], reg_val[i]);
297 if (ret)
298 break;
299 }
300
301 return ret;
302}
303
304static void lm3530_brightness_set(struct led_classdev *led_cdev,
305 enum led_brightness brt_val)
306{
307 int err;
308 struct lm3530_data *drvdata =
309 container_of(led_cdev, struct lm3530_data, led_dev);
310 struct lm3530_platform_data *pdata = drvdata->pdata;
311 struct lm3530_pwm_data *pwm = &pdata->pwm_data;
312 u8 max_brightness = led_cdev->max_brightness;
313
314 switch (drvdata->mode) {
315 case LM3530_BL_MODE_MANUAL:
316
317 if (!drvdata->enable) {
318 err = lm3530_init_registers(drvdata);
319 if (err) {
320 dev_err(&drvdata->client->dev,
321 "Register Init failed: %d\n", err);
322 break;
323 }
324 }
325
326 /* set the brightness in brightness control register*/
327 err = i2c_smbus_write_byte_data(drvdata->client,
328 LM3530_BRT_CTRL_REG, brt_val);
329 if (err)
330 dev_err(&drvdata->client->dev,
331 "Unable to set brightness: %d\n", err);
332 else
333 drvdata->brightness = brt_val;
334
335 if (brt_val == 0)
336 lm3530_led_disable(drvdata);
337 break;
338 case LM3530_BL_MODE_ALS:
339 break;
340 case LM3530_BL_MODE_PWM:
341 if (pwm->pwm_set_intensity)
342 pwm->pwm_set_intensity(brt_val, max_brightness);
343 break;
344 default:
345 break;
346 }
347}
348
349static ssize_t mode_show(struct device *dev,
350 struct device_attribute *attr, char *buf)
351{
352 struct led_classdev *led_cdev = dev_get_drvdata(dev);
353 struct lm3530_data *drvdata;
354 int i, len = 0;
355
356 drvdata = container_of(led_cdev, struct lm3530_data, led_dev);
357 for (i = 0; i < ARRAY_SIZE(mode_map); i++)
358 if (drvdata->mode == mode_map[i].mode_val)
359 len += sprintf(buf + len, "[%s] ", mode_map[i].mode);
360 else
361 len += sprintf(buf + len, "%s ", mode_map[i].mode);
362
363 len += sprintf(buf + len, "\n");
364
365 return len;
366}
367
368static ssize_t mode_store(struct device *dev, struct device_attribute
369 *attr, const char *buf, size_t size)
370{
371 struct led_classdev *led_cdev = dev_get_drvdata(dev);
372 struct lm3530_data *drvdata;
373 struct lm3530_pwm_data *pwm;
374 u8 max_brightness;
375 int mode, err;
376
377 drvdata = container_of(led_cdev, struct lm3530_data, led_dev);
378 pwm = &drvdata->pdata->pwm_data;
379 max_brightness = led_cdev->max_brightness;
380 mode = lm3530_get_mode_from_str(buf);
381 if (mode < 0) {
382 dev_err(dev, "Invalid mode\n");
383 return mode;
384 }
385
386 drvdata->mode = mode;
387
388 /* set pwm to low if unnecessary */
389 if (mode != LM3530_BL_MODE_PWM && pwm->pwm_set_intensity)
390 pwm->pwm_set_intensity(0, max_brightness);
391
392 err = lm3530_init_registers(drvdata);
393 if (err) {
394 dev_err(dev, "Setting %s Mode failed :%d\n", buf, err);
395 return err;
396 }
397
398 return sizeof(drvdata->mode);
399}
400static DEVICE_ATTR_RW(mode);
401
402static struct attribute *lm3530_attrs[] = {
403 &dev_attr_mode.attr,
404 NULL
405};
406ATTRIBUTE_GROUPS(lm3530);
407
408static int lm3530_probe(struct i2c_client *client)
409{
410 struct lm3530_platform_data *pdata = dev_get_platdata(&client->dev);
411 struct lm3530_data *drvdata;
412 int err = 0;
413
414 if (pdata == NULL) {
415 dev_err(&client->dev, "platform data required\n");
416 return -ENODEV;
417 }
418
419 /* BL mode */
420 if (pdata->mode > LM3530_BL_MODE_PWM) {
421 dev_err(&client->dev, "Illegal Mode request\n");
422 return -EINVAL;
423 }
424
425 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
426 dev_err(&client->dev, "I2C_FUNC_I2C not supported\n");
427 return -EIO;
428 }
429
430 drvdata = devm_kzalloc(&client->dev, sizeof(struct lm3530_data),
431 GFP_KERNEL);
432 if (drvdata == NULL)
433 return -ENOMEM;
434
435 drvdata->mode = pdata->mode;
436 drvdata->client = client;
437 drvdata->pdata = pdata;
438 drvdata->brightness = LED_OFF;
439 drvdata->enable = false;
440 drvdata->led_dev.name = LM3530_LED_DEV;
441 drvdata->led_dev.brightness_set = lm3530_brightness_set;
442 drvdata->led_dev.max_brightness = MAX_BRIGHTNESS;
443 drvdata->led_dev.groups = lm3530_groups;
444
445 i2c_set_clientdata(client, drvdata);
446
447 drvdata->regulator = devm_regulator_get(&client->dev, "vin");
448 if (IS_ERR(drvdata->regulator)) {
449 dev_err(&client->dev, "regulator get failed\n");
450 err = PTR_ERR(drvdata->regulator);
451 drvdata->regulator = NULL;
452 return err;
453 }
454
455 if (drvdata->pdata->brt_val) {
456 err = lm3530_init_registers(drvdata);
457 if (err < 0) {
458 dev_err(&client->dev,
459 "Register Init failed: %d\n", err);
460 return err;
461 }
462 }
463 err = led_classdev_register(&client->dev, &drvdata->led_dev);
464 if (err < 0) {
465 dev_err(&client->dev, "Register led class failed: %d\n", err);
466 return err;
467 }
468
469 return 0;
470}
471
472static void lm3530_remove(struct i2c_client *client)
473{
474 struct lm3530_data *drvdata = i2c_get_clientdata(client);
475
476 lm3530_led_disable(drvdata);
477 led_classdev_unregister(&drvdata->led_dev);
478}
479
480static const struct i2c_device_id lm3530_id[] = {
481 {LM3530_NAME, 0},
482 {}
483};
484MODULE_DEVICE_TABLE(i2c, lm3530_id);
485
486static struct i2c_driver lm3530_i2c_driver = {
487 .probe = lm3530_probe,
488 .remove = lm3530_remove,
489 .id_table = lm3530_id,
490 .driver = {
491 .name = LM3530_NAME,
492 },
493};
494
495module_i2c_driver(lm3530_i2c_driver);
496
497MODULE_DESCRIPTION("Back Light driver for LM3530");
498MODULE_LICENSE("GPL v2");
499MODULE_AUTHOR("Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>");
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>
20#include <linux/regulator/consumer.h>
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_ALS_ZB_MAX (4)
72#define LM3530_ALS_WINDOW_mV (1000)
73#define LM3530_ALS_OFFSET_mV (4)
74
75/* Zone Target Register defaults */
76#define LM3530_DEF_ZT_0 (0x7F)
77#define LM3530_DEF_ZT_1 (0x66)
78#define LM3530_DEF_ZT_2 (0x4C)
79#define LM3530_DEF_ZT_3 (0x33)
80#define LM3530_DEF_ZT_4 (0x19)
81
82struct lm3530_mode_map {
83 const char *mode;
84 enum lm3530_mode mode_val;
85};
86
87static struct lm3530_mode_map mode_map[] = {
88 { "man", LM3530_BL_MODE_MANUAL },
89 { "als", LM3530_BL_MODE_ALS },
90 { "pwm", LM3530_BL_MODE_PWM },
91};
92
93/**
94 * struct lm3530_data
95 * @led_dev: led class device
96 * @client: i2c client
97 * @pdata: LM3530 platform data
98 * @mode: mode of operation - manual, ALS, PWM
99 * @regulator: regulator
100 * @brighness: previous brightness value
101 * @enable: regulator is enabled
102 */
103struct lm3530_data {
104 struct led_classdev led_dev;
105 struct i2c_client *client;
106 struct lm3530_platform_data *pdata;
107 enum lm3530_mode mode;
108 struct regulator *regulator;
109 enum led_brightness brightness;
110 bool enable;
111};
112
113static const u8 lm3530_reg[LM3530_REG_MAX] = {
114 LM3530_GEN_CONFIG,
115 LM3530_ALS_CONFIG,
116 LM3530_BRT_RAMP_RATE,
117 LM3530_ALS_ZONE_REG,
118 LM3530_ALS_IMP_SELECT,
119 LM3530_BRT_CTRL_REG,
120 LM3530_ALS_ZB0_REG,
121 LM3530_ALS_ZB1_REG,
122 LM3530_ALS_ZB2_REG,
123 LM3530_ALS_ZB3_REG,
124 LM3530_ALS_Z0T_REG,
125 LM3530_ALS_Z1T_REG,
126 LM3530_ALS_Z2T_REG,
127 LM3530_ALS_Z3T_REG,
128 LM3530_ALS_Z4T_REG,
129};
130
131static int lm3530_get_mode_from_str(const char *str)
132{
133 int i;
134
135 for (i = 0; i < ARRAY_SIZE(mode_map); i++)
136 if (sysfs_streq(str, mode_map[i].mode))
137 return mode_map[i].mode_val;
138
139 return -1;
140}
141
142static int lm3530_init_registers(struct lm3530_data *drvdata)
143{
144 int ret = 0;
145 int i;
146 u8 gen_config;
147 u8 als_config = 0;
148 u8 brt_ramp;
149 u8 als_imp_sel = 0;
150 u8 brightness;
151 u8 reg_val[LM3530_REG_MAX];
152 u8 zones[LM3530_ALS_ZB_MAX];
153 u32 als_vmin, als_vmax, als_vstep;
154 struct lm3530_platform_data *pltfm = drvdata->pdata;
155 struct i2c_client *client = drvdata->client;
156
157 gen_config = (pltfm->brt_ramp_law << LM3530_RAMP_LAW_SHIFT) |
158 ((pltfm->max_current & 7) << LM3530_MAX_CURR_SHIFT);
159
160 if (drvdata->mode == LM3530_BL_MODE_MANUAL ||
161 drvdata->mode == LM3530_BL_MODE_ALS)
162 gen_config |= (LM3530_ENABLE_I2C);
163
164 if (drvdata->mode == LM3530_BL_MODE_ALS) {
165 if (pltfm->als_vmax == 0) {
166 pltfm->als_vmin = als_vmin = 0;
167 pltfm->als_vmin = als_vmax = LM3530_ALS_WINDOW_mV;
168 }
169
170 als_vmin = pltfm->als_vmin;
171 als_vmax = pltfm->als_vmax;
172
173 if ((als_vmax - als_vmin) > LM3530_ALS_WINDOW_mV)
174 pltfm->als_vmax = als_vmax =
175 als_vmin + LM3530_ALS_WINDOW_mV;
176
177 /* n zone boundary makes n+1 zones */
178 als_vstep = (als_vmax - als_vmin) / (LM3530_ALS_ZB_MAX + 1);
179
180 for (i = 0; i < LM3530_ALS_ZB_MAX; i++)
181 zones[i] = (((als_vmin + LM3530_ALS_OFFSET_mV) +
182 als_vstep + (i * als_vstep)) * LED_FULL)
183 / 1000;
184
185 als_config =
186 (pltfm->als_avrg_time << LM3530_ALS_AVG_TIME_SHIFT) |
187 (LM3530_ENABLE_ALS) |
188 (pltfm->als_input_mode << LM3530_ALS_SEL_SHIFT);
189
190 als_imp_sel =
191 (pltfm->als1_resistor_sel << LM3530_ALS1_IMP_SHIFT) |
192 (pltfm->als2_resistor_sel << LM3530_ALS2_IMP_SHIFT);
193
194 }
195
196 if (drvdata->mode == LM3530_BL_MODE_PWM)
197 gen_config |= (LM3530_ENABLE_PWM) |
198 (pltfm->pwm_pol_hi << LM3530_PWM_POL_SHIFT) |
199 (LM3530_ENABLE_PWM_SIMPLE);
200
201 brt_ramp = (pltfm->brt_ramp_fall << LM3530_BRT_RAMP_FALL_SHIFT) |
202 (pltfm->brt_ramp_rise << LM3530_BRT_RAMP_RISE_SHIFT);
203
204 if (drvdata->brightness)
205 brightness = drvdata->brightness;
206 else
207 brightness = drvdata->brightness = pltfm->brt_val;
208
209 reg_val[0] = gen_config; /* LM3530_GEN_CONFIG */
210 reg_val[1] = als_config; /* LM3530_ALS_CONFIG */
211 reg_val[2] = brt_ramp; /* LM3530_BRT_RAMP_RATE */
212 reg_val[3] = 0x00; /* LM3530_ALS_ZONE_REG */
213 reg_val[4] = als_imp_sel; /* LM3530_ALS_IMP_SELECT */
214 reg_val[5] = brightness; /* LM3530_BRT_CTRL_REG */
215 reg_val[6] = zones[0]; /* LM3530_ALS_ZB0_REG */
216 reg_val[7] = zones[1]; /* LM3530_ALS_ZB1_REG */
217 reg_val[8] = zones[2]; /* LM3530_ALS_ZB2_REG */
218 reg_val[9] = zones[3]; /* LM3530_ALS_ZB3_REG */
219 reg_val[10] = LM3530_DEF_ZT_0; /* LM3530_ALS_Z0T_REG */
220 reg_val[11] = LM3530_DEF_ZT_1; /* LM3530_ALS_Z1T_REG */
221 reg_val[12] = LM3530_DEF_ZT_2; /* LM3530_ALS_Z2T_REG */
222 reg_val[13] = LM3530_DEF_ZT_3; /* LM3530_ALS_Z3T_REG */
223 reg_val[14] = LM3530_DEF_ZT_4; /* LM3530_ALS_Z4T_REG */
224
225 if (!drvdata->enable) {
226 ret = regulator_enable(drvdata->regulator);
227 if (ret) {
228 dev_err(&drvdata->client->dev,
229 "Enable regulator failed\n");
230 return ret;
231 }
232 drvdata->enable = true;
233 }
234
235 for (i = 0; i < LM3530_REG_MAX; i++) {
236 ret = i2c_smbus_write_byte_data(client,
237 lm3530_reg[i], reg_val[i]);
238 if (ret)
239 break;
240 }
241
242 return ret;
243}
244
245static void lm3530_brightness_set(struct led_classdev *led_cdev,
246 enum led_brightness brt_val)
247{
248 int err;
249 struct lm3530_data *drvdata =
250 container_of(led_cdev, struct lm3530_data, led_dev);
251
252 switch (drvdata->mode) {
253 case LM3530_BL_MODE_MANUAL:
254
255 if (!drvdata->enable) {
256 err = lm3530_init_registers(drvdata);
257 if (err) {
258 dev_err(&drvdata->client->dev,
259 "Register Init failed: %d\n", err);
260 break;
261 }
262 }
263
264 /* set the brightness in brightness control register*/
265 err = i2c_smbus_write_byte_data(drvdata->client,
266 LM3530_BRT_CTRL_REG, brt_val / 2);
267 if (err)
268 dev_err(&drvdata->client->dev,
269 "Unable to set brightness: %d\n", err);
270 else
271 drvdata->brightness = brt_val / 2;
272
273 if (brt_val == 0) {
274 err = regulator_disable(drvdata->regulator);
275 if (err)
276 dev_err(&drvdata->client->dev,
277 "Disable regulator failed\n");
278 drvdata->enable = false;
279 }
280 break;
281 case LM3530_BL_MODE_ALS:
282 break;
283 case LM3530_BL_MODE_PWM:
284 break;
285 default:
286 break;
287 }
288}
289
290static ssize_t lm3530_mode_get(struct device *dev,
291 struct device_attribute *attr, char *buf)
292{
293 struct i2c_client *client = container_of(
294 dev->parent, struct i2c_client, dev);
295 struct lm3530_data *drvdata = i2c_get_clientdata(client);
296 int i, len = 0;
297
298 for (i = 0; i < ARRAY_SIZE(mode_map); i++)
299 if (drvdata->mode == mode_map[i].mode_val)
300 len += sprintf(buf + len, "[%s] ", mode_map[i].mode);
301 else
302 len += sprintf(buf + len, "%s ", mode_map[i].mode);
303
304 len += sprintf(buf + len, "\n");
305
306 return len;
307}
308
309static ssize_t lm3530_mode_set(struct device *dev, struct device_attribute
310 *attr, const char *buf, size_t size)
311{
312 int err;
313 struct i2c_client *client = container_of(
314 dev->parent, struct i2c_client, dev);
315 struct lm3530_data *drvdata = i2c_get_clientdata(client);
316 int mode;
317
318 mode = lm3530_get_mode_from_str(buf);
319 if (mode < 0) {
320 dev_err(dev, "Invalid mode\n");
321 return -EINVAL;
322 }
323
324 if (mode == LM3530_BL_MODE_MANUAL)
325 drvdata->mode = LM3530_BL_MODE_MANUAL;
326 else if (mode == LM3530_BL_MODE_ALS)
327 drvdata->mode = LM3530_BL_MODE_ALS;
328 else if (mode == LM3530_BL_MODE_PWM) {
329 dev_err(dev, "PWM mode not supported\n");
330 return -EINVAL;
331 }
332
333 err = lm3530_init_registers(drvdata);
334 if (err) {
335 dev_err(dev, "Setting %s Mode failed :%d\n", buf, err);
336 return err;
337 }
338
339 return sizeof(drvdata->mode);
340}
341static DEVICE_ATTR(mode, 0644, lm3530_mode_get, lm3530_mode_set);
342
343static int __devinit lm3530_probe(struct i2c_client *client,
344 const struct i2c_device_id *id)
345{
346 struct lm3530_platform_data *pdata = client->dev.platform_data;
347 struct lm3530_data *drvdata;
348 int err = 0;
349
350 if (pdata == NULL) {
351 dev_err(&client->dev, "platform data required\n");
352 err = -ENODEV;
353 goto err_out;
354 }
355
356 /* BL mode */
357 if (pdata->mode > LM3530_BL_MODE_PWM) {
358 dev_err(&client->dev, "Illegal Mode request\n");
359 err = -EINVAL;
360 goto err_out;
361 }
362
363 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
364 dev_err(&client->dev, "I2C_FUNC_I2C not supported\n");
365 err = -EIO;
366 goto err_out;
367 }
368
369 drvdata = kzalloc(sizeof(struct lm3530_data), GFP_KERNEL);
370 if (drvdata == NULL) {
371 err = -ENOMEM;
372 goto err_out;
373 }
374
375 drvdata->mode = pdata->mode;
376 drvdata->client = client;
377 drvdata->pdata = pdata;
378 drvdata->brightness = LED_OFF;
379 drvdata->enable = false;
380 drvdata->led_dev.name = LM3530_LED_DEV;
381 drvdata->led_dev.brightness_set = lm3530_brightness_set;
382
383 i2c_set_clientdata(client, drvdata);
384
385 drvdata->regulator = regulator_get(&client->dev, "vin");
386 if (IS_ERR(drvdata->regulator)) {
387 dev_err(&client->dev, "regulator get failed\n");
388 err = PTR_ERR(drvdata->regulator);
389 drvdata->regulator = NULL;
390 goto err_regulator_get;
391 }
392
393 if (drvdata->pdata->brt_val) {
394 err = lm3530_init_registers(drvdata);
395 if (err < 0) {
396 dev_err(&client->dev,
397 "Register Init failed: %d\n", err);
398 err = -ENODEV;
399 goto err_reg_init;
400 }
401 }
402 err = led_classdev_register(&client->dev, &drvdata->led_dev);
403 if (err < 0) {
404 dev_err(&client->dev, "Register led class failed: %d\n", err);
405 err = -ENODEV;
406 goto err_class_register;
407 }
408
409 err = device_create_file(drvdata->led_dev.dev, &dev_attr_mode);
410 if (err < 0) {
411 dev_err(&client->dev, "File device creation failed: %d\n", err);
412 err = -ENODEV;
413 goto err_create_file;
414 }
415
416 return 0;
417
418err_create_file:
419 led_classdev_unregister(&drvdata->led_dev);
420err_class_register:
421err_reg_init:
422 regulator_put(drvdata->regulator);
423err_regulator_get:
424 i2c_set_clientdata(client, NULL);
425 kfree(drvdata);
426err_out:
427 return err;
428}
429
430static 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);
435
436 if (drvdata->enable)
437 regulator_disable(drvdata->regulator);
438 regulator_put(drvdata->regulator);
439 led_classdev_unregister(&drvdata->led_dev);
440 kfree(drvdata);
441 return 0;
442}
443
444static const struct i2c_device_id lm3530_id[] = {
445 {LM3530_NAME, 0},
446 {}
447};
448MODULE_DEVICE_TABLE(i2c, lm3530_id);
449
450static struct i2c_driver lm3530_i2c_driver = {
451 .probe = lm3530_probe,
452 .remove = lm3530_remove,
453 .id_table = lm3530_id,
454 .driver = {
455 .name = LM3530_NAME,
456 .owner = THIS_MODULE,
457 },
458};
459
460static int __init lm3530_init(void)
461{
462 return i2c_add_driver(&lm3530_i2c_driver);
463}
464
465static void __exit lm3530_exit(void)
466{
467 i2c_del_driver(&lm3530_i2c_driver);
468}
469
470module_init(lm3530_init);
471module_exit(lm3530_exit);
472
473MODULE_DESCRIPTION("Back Light driver for LM3530");
474MODULE_LICENSE("GPL v2");
475MODULE_AUTHOR("Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>");