1 // SPDX-License-Identifier: GPL-2.0
2 // TI LM3532 LED driver
3 // Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com/
4 // https://www.ti.com/lit/ds/symlink/lm3532.pdf
5
6 #include <linux/i2c.h>
7 #include <linux/leds.h>
8 #include <linux/slab.h>
9 #include <linux/regmap.h>
10 #include <linux/types.h>
11 #include <linux/regulator/consumer.h>
12 #include <linux/module.h>
13 #include <uapi/linux/uleds.h>
14 #include <linux/gpio/consumer.h>
15
16 #define LM3532_NAME "lm3532-led"
17 #define LM3532_BL_MODE_MANUAL 0x00
18 #define LM3532_BL_MODE_ALS 0x01
19
20 #define LM3532_REG_OUTPUT_CFG 0x10
21 #define LM3532_REG_STARTSHUT_RAMP 0x11
22 #define LM3532_REG_RT_RAMP 0x12
23 #define LM3532_REG_PWM_A_CFG 0x13
24 #define LM3532_REG_PWM_B_CFG 0x14
25 #define LM3532_REG_PWM_C_CFG 0x15
26 #define LM3532_REG_ZONE_CFG_A 0x16
27 #define LM3532_REG_CTRL_A_FS_CURR 0x17
28 #define LM3532_REG_ZONE_CFG_B 0x18
29 #define LM3532_REG_CTRL_B_FS_CURR 0x19
30 #define LM3532_REG_ZONE_CFG_C 0x1a
31 #define LM3532_REG_CTRL_C_FS_CURR 0x1b
32 #define LM3532_REG_ENABLE 0x1d
33 #define LM3532_ALS_CONFIG 0x23
34 #define LM3532_REG_ZN_0_HI 0x60
35 #define LM3532_REG_ZN_0_LO 0x61
36 #define LM3532_REG_ZN_1_HI 0x62
37 #define LM3532_REG_ZN_1_LO 0x63
38 #define LM3532_REG_ZN_2_HI 0x64
39 #define LM3532_REG_ZN_2_LO 0x65
40 #define LM3532_REG_ZN_3_HI 0x66
41 #define LM3532_REG_ZN_3_LO 0x67
42 #define LM3532_REG_ZONE_TRGT_A 0x70
43 #define LM3532_REG_ZONE_TRGT_B 0x75
44 #define LM3532_REG_ZONE_TRGT_C 0x7a
45 #define LM3532_REG_MAX 0x7e
46
47 /* Control Enable */
48 #define LM3532_CTRL_A_ENABLE BIT(0)
49 #define LM3532_CTRL_B_ENABLE BIT(1)
50 #define LM3532_CTRL_C_ENABLE BIT(2)
51
52 /* PWM Zone Control */
53 #define LM3532_PWM_ZONE_MASK 0x7c
54 #define LM3532_PWM_ZONE_0_EN BIT(2)
55 #define LM3532_PWM_ZONE_1_EN BIT(3)
56 #define LM3532_PWM_ZONE_2_EN BIT(4)
57 #define LM3532_PWM_ZONE_3_EN BIT(5)
58 #define LM3532_PWM_ZONE_4_EN BIT(6)
59
60 /* Brightness Configuration */
61 #define LM3532_I2C_CTRL BIT(0)
62 #define LM3532_ALS_CTRL 0
63 #define LM3532_LINEAR_MAP BIT(1)
64 #define LM3532_ZONE_MASK (BIT(2) | BIT(3) | BIT(4))
65 #define LM3532_ZONE_0 0
66 #define LM3532_ZONE_1 BIT(2)
67 #define LM3532_ZONE_2 BIT(3)
68 #define LM3532_ZONE_3 (BIT(2) | BIT(3))
69 #define LM3532_ZONE_4 BIT(4)
70
71 #define LM3532_ENABLE_ALS BIT(3)
72 #define LM3532_ALS_SEL_SHIFT 6
73
74 /* Zone Boundary Register */
75 #define LM3532_ALS_WINDOW_mV 2000
76 #define LM3532_ALS_ZB_MAX 4
77 #define LM3532_ALS_OFFSET_mV 2
78
79 #define LM3532_CONTROL_A 0
80 #define LM3532_CONTROL_B 1
81 #define LM3532_CONTROL_C 2
82 #define LM3532_MAX_CONTROL_BANKS 3
83 #define LM3532_MAX_LED_STRINGS 3
84
85 #define LM3532_OUTPUT_CFG_MASK 0x3
86 #define LM3532_BRT_VAL_ADJUST 8
87 #define LM3532_RAMP_DOWN_SHIFT 3
88
89 #define LM3532_NUM_RAMP_VALS 8
90 #define LM3532_NUM_AVG_VALS 8
91 #define LM3532_NUM_IMP_VALS 32
92
93 #define LM3532_FS_CURR_MIN 5000
94 #define LM3532_FS_CURR_MAX 29800
95 #define LM3532_FS_CURR_STEP 800
96
97 /*
98 * struct lm3532_als_data
99 * @config: value of ALS configuration register
100 * @als1_imp_sel: value of ALS1 resistor select register
101 * @als2_imp_sel: value of ALS2 resistor select register
102 * @als_avrg_time: ALS averaging time
103 * @als_input_mode: ALS input mode for brightness control
104 * @als_vmin: Minimum ALS voltage
105 * @als_vmax: Maximum ALS voltage
106 * @zone_lo: values of ALS lo ZB(Zone Boundary) registers
107 * @zone_hi: values of ALS hi ZB(Zone Boundary) registers
108 */
109 struct lm3532_als_data {
110 u8 config;
111 u8 als1_imp_sel;
112 u8 als2_imp_sel;
113 u8 als_avrg_time;
114 u8 als_input_mode;
115 u32 als_vmin;
116 u32 als_vmax;
117 u8 zones_lo[LM3532_ALS_ZB_MAX];
118 u8 zones_hi[LM3532_ALS_ZB_MAX];
119 };
120
121 /**
122 * struct lm3532_led
123 * @led_dev: led class device
124 * @priv: Pointer the device data structure
125 * @control_bank: Control bank the LED is associated to
126 * @mode: Mode of the LED string
127 * @ctrl_brt_pointer: Zone target register that controls the sink
128 * @num_leds: Number of LED strings are supported in this array
129 * @full_scale_current: The full-scale current setting for the current sink.
130 * @led_strings: The LED strings supported in this array
131 * @enabled: Enabled status
132 */
133 struct lm3532_led {
134 struct led_classdev led_dev;
135 struct lm3532_data *priv;
136
137 int control_bank;
138 int mode;
139 int ctrl_brt_pointer;
140 int num_leds;
141 int full_scale_current;
142 unsigned int enabled:1;
143 u32 led_strings[LM3532_MAX_CONTROL_BANKS];
144 };
145
146 /**
147 * struct lm3532_data
148 * @enable_gpio: Hardware enable gpio
149 * @regulator: regulator
150 * @client: i2c client
151 * @regmap: Devices register map
152 * @dev: Pointer to the devices device struct
153 * @lock: Lock for reading/writing the device
154 * @als_data: Pointer to the als data struct
155 * @runtime_ramp_up: Runtime ramp up setting
156 * @runtime_ramp_down: Runtime ramp down setting
157 * @leds: Array of LED strings
158 */
159 struct lm3532_data {
160 struct gpio_desc *enable_gpio;
161 struct regulator *regulator;
162 struct i2c_client *client;
163 struct regmap *regmap;
164 struct device *dev;
165 struct mutex lock;
166
167 struct lm3532_als_data *als_data;
168
169 u32 runtime_ramp_up;
170 u32 runtime_ramp_down;
171
172 struct lm3532_led leds[];
173 };
174
175 static const struct reg_default lm3532_reg_defs[] = {
176 {LM3532_REG_OUTPUT_CFG, 0xe4},
177 {LM3532_REG_STARTSHUT_RAMP, 0xc0},
178 {LM3532_REG_RT_RAMP, 0xc0},
179 {LM3532_REG_PWM_A_CFG, 0x82},
180 {LM3532_REG_PWM_B_CFG, 0x82},
181 {LM3532_REG_PWM_C_CFG, 0x82},
182 {LM3532_REG_ZONE_CFG_A, 0xf1},
183 {LM3532_REG_CTRL_A_FS_CURR, 0xf3},
184 {LM3532_REG_ZONE_CFG_B, 0xf1},
185 {LM3532_REG_CTRL_B_FS_CURR, 0xf3},
186 {LM3532_REG_ZONE_CFG_C, 0xf1},
187 {LM3532_REG_CTRL_C_FS_CURR, 0xf3},
188 {LM3532_REG_ENABLE, 0xf8},
189 {LM3532_ALS_CONFIG, 0x44},
190 {LM3532_REG_ZN_0_HI, 0x35},
191 {LM3532_REG_ZN_0_LO, 0x33},
192 {LM3532_REG_ZN_1_HI, 0x6a},
193 {LM3532_REG_ZN_1_LO, 0x66},
194 {LM3532_REG_ZN_2_HI, 0xa1},
195 {LM3532_REG_ZN_2_LO, 0x99},
196 {LM3532_REG_ZN_3_HI, 0xdc},
197 {LM3532_REG_ZN_3_LO, 0xcc},
198 };
199
200 static const struct regmap_config lm3532_regmap_config = {
201 .reg_bits = 8,
202 .val_bits = 8,
203
204 .max_register = LM3532_REG_MAX,
205 .reg_defaults = lm3532_reg_defs,
206 .num_reg_defaults = ARRAY_SIZE(lm3532_reg_defs),
207 .cache_type = REGCACHE_FLAT,
208 };
209
210 static const int als_imp_table[LM3532_NUM_IMP_VALS] = {37000, 18500, 12330,
211 92500, 7400, 6170, 5290,
212 4630, 4110, 3700, 3360,
213 3080, 2850, 2640, 2440,
214 2310, 2180, 2060, 1950,
215 1850, 1760, 1680, 1610,
216 1540, 1480, 1420, 1370,
217 1320, 1280, 1230, 1190};
lm3532_get_als_imp_index(int als_imped)218 static int lm3532_get_als_imp_index(int als_imped)
219 {
220 int i;
221
222 if (als_imped > als_imp_table[1])
223 return 0;
224
225 if (als_imped < als_imp_table[LM3532_NUM_IMP_VALS - 1])
226 return LM3532_NUM_IMP_VALS - 1;
227
228 for (i = 1; i < LM3532_NUM_IMP_VALS; i++) {
229 if (als_imped == als_imp_table[i])
230 return i;
231
232 /* Find an approximate index by looking up the table */
233 if (als_imped < als_imp_table[i - 1] &&
234 als_imped > als_imp_table[i]) {
235 if (als_imped - als_imp_table[i - 1] <
236 als_imp_table[i] - als_imped)
237 return i + 1;
238 else
239 return i;
240 }
241 }
242
243 return -EINVAL;
244 }
245
lm3532_get_index(const int table[],int size,int value)246 static int lm3532_get_index(const int table[], int size, int value)
247 {
248 int i;
249
250 for (i = 1; i < size; i++) {
251 if (value == table[i])
252 return i;
253
254 /* Find an approximate index by looking up the table */
255 if (value > table[i - 1] &&
256 value < table[i]) {
257 if (value - table[i - 1] < table[i] - value)
258 return i - 1;
259 else
260 return i;
261 }
262 }
263
264 return -EINVAL;
265 }
266
267 static const int als_avrg_table[LM3532_NUM_AVG_VALS] = {17920, 35840, 71680,
268 1433360, 286720, 573440,
269 1146880, 2293760};
lm3532_get_als_avg_index(int avg_time)270 static int lm3532_get_als_avg_index(int avg_time)
271 {
272 if (avg_time <= als_avrg_table[0])
273 return 0;
274
275 if (avg_time > als_avrg_table[LM3532_NUM_AVG_VALS - 1])
276 return LM3532_NUM_AVG_VALS - 1;
277
278 return lm3532_get_index(&als_avrg_table[0], LM3532_NUM_AVG_VALS,
279 avg_time);
280 }
281
282 static const int ramp_table[LM3532_NUM_RAMP_VALS] = { 8, 1024, 2048, 4096, 8192,
283 16384, 32768, 65536};
lm3532_get_ramp_index(int ramp_time)284 static int lm3532_get_ramp_index(int ramp_time)
285 {
286 if (ramp_time <= ramp_table[0])
287 return 0;
288
289 if (ramp_time > ramp_table[LM3532_NUM_RAMP_VALS - 1])
290 return LM3532_NUM_RAMP_VALS - 1;
291
292 return lm3532_get_index(&ramp_table[0], LM3532_NUM_RAMP_VALS,
293 ramp_time);
294 }
295
296 /* Caller must take care of locking */
lm3532_led_enable(struct lm3532_led * led_data)297 static int lm3532_led_enable(struct lm3532_led *led_data)
298 {
299 int ctrl_en_val = BIT(led_data->control_bank);
300 int ret;
301
302 if (led_data->enabled)
303 return 0;
304
305 ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE,
306 ctrl_en_val, ctrl_en_val);
307 if (ret) {
308 dev_err(led_data->priv->dev, "Failed to set ctrl:%d\n", ret);
309 return ret;
310 }
311
312 ret = regulator_enable(led_data->priv->regulator);
313 if (ret < 0)
314 return ret;
315
316 led_data->enabled = 1;
317
318 return 0;
319 }
320
321 /* Caller must take care of locking */
lm3532_led_disable(struct lm3532_led * led_data)322 static int lm3532_led_disable(struct lm3532_led *led_data)
323 {
324 int ctrl_en_val = BIT(led_data->control_bank);
325 int ret;
326
327 if (!led_data->enabled)
328 return 0;
329
330 ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE,
331 ctrl_en_val, 0);
332 if (ret) {
333 dev_err(led_data->priv->dev, "Failed to set ctrl:%d\n", ret);
334 return ret;
335 }
336
337 ret = regulator_disable(led_data->priv->regulator);
338 if (ret < 0)
339 return ret;
340
341 led_data->enabled = 0;
342
343 return 0;
344 }
345
lm3532_brightness_set(struct led_classdev * led_cdev,enum led_brightness brt_val)346 static int lm3532_brightness_set(struct led_classdev *led_cdev,
347 enum led_brightness brt_val)
348 {
349 struct lm3532_led *led =
350 container_of(led_cdev, struct lm3532_led, led_dev);
351 u8 brightness_reg;
352 int ret;
353
354 mutex_lock(&led->priv->lock);
355
356 if (led->mode == LM3532_ALS_CTRL) {
357 if (brt_val > LED_OFF)
358 ret = lm3532_led_enable(led);
359 else
360 ret = lm3532_led_disable(led);
361
362 goto unlock;
363 }
364
365 if (brt_val == LED_OFF) {
366 ret = lm3532_led_disable(led);
367 goto unlock;
368 }
369
370 ret = lm3532_led_enable(led);
371 if (ret)
372 goto unlock;
373
374 brightness_reg = LM3532_REG_ZONE_TRGT_A + led->control_bank * 5 +
375 (led->ctrl_brt_pointer >> 2);
376
377 ret = regmap_write(led->priv->regmap, brightness_reg, brt_val);
378
379 unlock:
380 mutex_unlock(&led->priv->lock);
381 return ret;
382 }
383
lm3532_init_registers(struct lm3532_led * led)384 static int lm3532_init_registers(struct lm3532_led *led)
385 {
386 struct lm3532_data *drvdata = led->priv;
387 unsigned int runtime_ramp_val;
388 unsigned int output_cfg_val = 0;
389 unsigned int output_cfg_shift = 0;
390 unsigned int output_cfg_mask = 0;
391 unsigned int brightness_config_reg;
392 unsigned int brightness_config_val;
393 int fs_current_reg;
394 int fs_current_val;
395 int ret, i;
396
397 if (drvdata->enable_gpio)
398 gpiod_direction_output(drvdata->enable_gpio, 1);
399
400 brightness_config_reg = LM3532_REG_ZONE_CFG_A + led->control_bank * 2;
401 /*
402 * This could be hard coded to the default value but the control
403 * brightness register may have changed during boot.
404 */
405 ret = regmap_read(drvdata->regmap, brightness_config_reg,
406 &led->ctrl_brt_pointer);
407 if (ret)
408 return ret;
409
410 led->ctrl_brt_pointer &= LM3532_ZONE_MASK;
411 brightness_config_val = led->ctrl_brt_pointer | led->mode;
412 ret = regmap_write(drvdata->regmap, brightness_config_reg,
413 brightness_config_val);
414 if (ret)
415 return ret;
416
417 if (led->full_scale_current) {
418 fs_current_reg = LM3532_REG_CTRL_A_FS_CURR + led->control_bank * 2;
419 fs_current_val = (led->full_scale_current - LM3532_FS_CURR_MIN) /
420 LM3532_FS_CURR_STEP;
421
422 ret = regmap_write(drvdata->regmap, fs_current_reg,
423 fs_current_val);
424 if (ret)
425 return ret;
426 }
427
428 for (i = 0; i < led->num_leds; i++) {
429 output_cfg_shift = led->led_strings[i] * 2;
430 output_cfg_val |= (led->control_bank << output_cfg_shift);
431 output_cfg_mask |= LM3532_OUTPUT_CFG_MASK << output_cfg_shift;
432 }
433
434 ret = regmap_update_bits(drvdata->regmap, LM3532_REG_OUTPUT_CFG,
435 output_cfg_mask, output_cfg_val);
436 if (ret)
437 return ret;
438
439 runtime_ramp_val = drvdata->runtime_ramp_up |
440 (drvdata->runtime_ramp_down << LM3532_RAMP_DOWN_SHIFT);
441
442 return regmap_write(drvdata->regmap, LM3532_REG_RT_RAMP,
443 runtime_ramp_val);
444 }
445
lm3532_als_configure(struct lm3532_data * priv,struct lm3532_led * led)446 static int lm3532_als_configure(struct lm3532_data *priv,
447 struct lm3532_led *led)
448 {
449 struct lm3532_als_data *als = priv->als_data;
450 u32 als_vmin, als_vmax, als_vstep;
451 int zone_reg = LM3532_REG_ZN_0_HI;
452 int ret;
453 int i;
454
455 als_vmin = als->als_vmin;
456 als_vmax = als->als_vmax;
457
458 als_vstep = (als_vmax - als_vmin) / ((LM3532_ALS_ZB_MAX + 1) * 2);
459
460 for (i = 0; i < LM3532_ALS_ZB_MAX; i++) {
461 als->zones_lo[i] = ((als_vmin + als_vstep + (i * als_vstep)) *
462 LED_FULL) / 1000;
463 als->zones_hi[i] = ((als_vmin + LM3532_ALS_OFFSET_mV +
464 als_vstep + (i * als_vstep)) * LED_FULL) / 1000;
465
466 zone_reg = LM3532_REG_ZN_0_HI + i * 2;
467 ret = regmap_write(priv->regmap, zone_reg, als->zones_lo[i]);
468 if (ret)
469 return ret;
470
471 zone_reg += 1;
472 ret = regmap_write(priv->regmap, zone_reg, als->zones_hi[i]);
473 if (ret)
474 return ret;
475 }
476
477 als->config = (als->als_avrg_time | (LM3532_ENABLE_ALS) |
478 (als->als_input_mode << LM3532_ALS_SEL_SHIFT));
479
480 return regmap_write(priv->regmap, LM3532_ALS_CONFIG, als->config);
481 }
482
lm3532_parse_als(struct lm3532_data * priv)483 static int lm3532_parse_als(struct lm3532_data *priv)
484 {
485 struct lm3532_als_data *als;
486 int als_avg_time;
487 int als_impedance;
488 int ret;
489
490 als = devm_kzalloc(priv->dev, sizeof(*als), GFP_KERNEL);
491 if (als == NULL)
492 return -ENOMEM;
493
494 ret = device_property_read_u32(&priv->client->dev, "ti,als-vmin",
495 &als->als_vmin);
496 if (ret)
497 als->als_vmin = 0;
498
499 ret = device_property_read_u32(&priv->client->dev, "ti,als-vmax",
500 &als->als_vmax);
501 if (ret)
502 als->als_vmax = LM3532_ALS_WINDOW_mV;
503
504 if (als->als_vmax > LM3532_ALS_WINDOW_mV) {
505 ret = -EINVAL;
506 return ret;
507 }
508
509 ret = device_property_read_u32(&priv->client->dev, "ti,als1-imp-sel",
510 &als_impedance);
511 if (ret)
512 als->als1_imp_sel = 0;
513 else
514 als->als1_imp_sel = lm3532_get_als_imp_index(als_impedance);
515
516 ret = device_property_read_u32(&priv->client->dev, "ti,als2-imp-sel",
517 &als_impedance);
518 if (ret)
519 als->als2_imp_sel = 0;
520 else
521 als->als2_imp_sel = lm3532_get_als_imp_index(als_impedance);
522
523 ret = device_property_read_u32(&priv->client->dev, "ti,als-avrg-time-us",
524 &als_avg_time);
525 if (ret)
526 als->als_avrg_time = 0;
527 else
528 als->als_avrg_time = lm3532_get_als_avg_index(als_avg_time);
529
530 ret = device_property_read_u8(&priv->client->dev, "ti,als-input-mode",
531 &als->als_input_mode);
532 if (ret)
533 als->als_input_mode = 0;
534
535 if (als->als_input_mode > LM3532_BL_MODE_ALS) {
536 ret = -EINVAL;
537 return ret;
538 }
539
540 priv->als_data = als;
541
542 return ret;
543 }
544
gpio_set_low_action(void * data)545 static void gpio_set_low_action(void *data)
546 {
547 struct lm3532_data *priv = data;
548
549 gpiod_direction_output(priv->enable_gpio, 0);
550 }
551
lm3532_parse_node(struct lm3532_data * priv)552 static int lm3532_parse_node(struct lm3532_data *priv)
553 {
554 struct fwnode_handle *child = NULL;
555 struct lm3532_led *led;
556 int control_bank;
557 u32 ramp_time;
558 size_t i = 0;
559 int ret;
560
561 priv->enable_gpio = devm_gpiod_get_optional(&priv->client->dev,
562 "enable", GPIOD_OUT_LOW);
563 if (IS_ERR(priv->enable_gpio))
564 priv->enable_gpio = NULL;
565
566 if (priv->enable_gpio) {
567 ret = devm_add_action(&priv->client->dev, gpio_set_low_action, priv);
568 if (ret)
569 return ret;
570 }
571
572 priv->regulator = devm_regulator_get(&priv->client->dev, "vin");
573 if (IS_ERR(priv->regulator))
574 priv->regulator = NULL;
575
576 ret = device_property_read_u32(&priv->client->dev, "ramp-up-us",
577 &ramp_time);
578 if (ret)
579 dev_info(&priv->client->dev, "ramp-up-ms property missing\n");
580 else
581 priv->runtime_ramp_up = lm3532_get_ramp_index(ramp_time);
582
583 ret = device_property_read_u32(&priv->client->dev, "ramp-down-us",
584 &ramp_time);
585 if (ret)
586 dev_info(&priv->client->dev, "ramp-down-ms property missing\n");
587 else
588 priv->runtime_ramp_down = lm3532_get_ramp_index(ramp_time);
589
590 device_for_each_child_node(priv->dev, child) {
591 struct led_init_data idata = {
592 .fwnode = child,
593 .default_label = ":",
594 .devicename = priv->client->name,
595 };
596
597 led = &priv->leds[i];
598
599 ret = fwnode_property_read_u32(child, "reg", &control_bank);
600 if (ret) {
601 dev_err(&priv->client->dev, "reg property missing\n");
602 goto child_out;
603 }
604
605 if (control_bank > LM3532_CONTROL_C) {
606 dev_err(&priv->client->dev, "Control bank invalid\n");
607 continue;
608 }
609
610 led->control_bank = control_bank;
611
612 ret = fwnode_property_read_u32(child, "ti,led-mode",
613 &led->mode);
614 if (ret) {
615 dev_err(&priv->client->dev, "ti,led-mode property missing\n");
616 goto child_out;
617 }
618
619 if (fwnode_property_present(child, "led-max-microamp") &&
620 fwnode_property_read_u32(child, "led-max-microamp",
621 &led->full_scale_current))
622 dev_err(&priv->client->dev,
623 "Failed getting led-max-microamp\n");
624 else
625 led->full_scale_current = min(led->full_scale_current,
626 LM3532_FS_CURR_MAX);
627
628 if (led->mode == LM3532_BL_MODE_ALS) {
629 led->mode = LM3532_ALS_CTRL;
630 ret = lm3532_parse_als(priv);
631 if (ret)
632 dev_err(&priv->client->dev, "Failed to parse als\n");
633 else
634 lm3532_als_configure(priv, led);
635 } else {
636 led->mode = LM3532_I2C_CTRL;
637 }
638
639 led->num_leds = fwnode_property_count_u32(child, "led-sources");
640 if (led->num_leds > LM3532_MAX_LED_STRINGS) {
641 dev_err(&priv->client->dev, "Too many LED string defined\n");
642 continue;
643 }
644
645 ret = fwnode_property_read_u32_array(child, "led-sources",
646 led->led_strings,
647 led->num_leds);
648 if (ret) {
649 dev_err(&priv->client->dev, "led-sources property missing\n");
650 goto child_out;
651 }
652
653 led->priv = priv;
654 led->led_dev.brightness_set_blocking = lm3532_brightness_set;
655
656 ret = devm_led_classdev_register_ext(priv->dev, &led->led_dev, &idata);
657 if (ret) {
658 dev_err(&priv->client->dev, "led register err: %d\n",
659 ret);
660 goto child_out;
661 }
662
663 ret = lm3532_init_registers(led);
664 if (ret) {
665 dev_err(&priv->client->dev, "register init err: %d\n",
666 ret);
667 goto child_out;
668 }
669
670 i++;
671 }
672 return 0;
673
674 child_out:
675 fwnode_handle_put(child);
676 return ret;
677 }
678
lm3532_probe(struct i2c_client * client)679 static int lm3532_probe(struct i2c_client *client)
680 {
681 struct lm3532_data *drvdata;
682 int ret = 0;
683 int count;
684
685 count = device_get_child_node_count(&client->dev);
686 if (!count) {
687 dev_err(&client->dev, "LEDs are not defined in device tree!");
688 return -ENODEV;
689 }
690
691 drvdata = devm_kzalloc(&client->dev, struct_size(drvdata, leds, count),
692 GFP_KERNEL);
693 if (drvdata == NULL)
694 return -ENOMEM;
695
696 drvdata->client = client;
697 drvdata->dev = &client->dev;
698
699 drvdata->regmap = devm_regmap_init_i2c(client, &lm3532_regmap_config);
700 if (IS_ERR(drvdata->regmap)) {
701 ret = PTR_ERR(drvdata->regmap);
702 dev_err(&client->dev, "Failed to allocate register map: %d\n",
703 ret);
704 return ret;
705 }
706
707 ret = devm_mutex_init(&client->dev, &drvdata->lock);
708 if (ret)
709 return ret;
710
711 i2c_set_clientdata(client, drvdata);
712
713 ret = lm3532_parse_node(drvdata);
714 if (ret) {
715 dev_err(&client->dev, "Failed to parse node\n");
716 return ret;
717 }
718
719 return ret;
720 }
721
722 static const struct of_device_id of_lm3532_leds_match[] = {
723 { .compatible = "ti,lm3532", },
724 {},
725 };
726 MODULE_DEVICE_TABLE(of, of_lm3532_leds_match);
727
728 static const struct i2c_device_id lm3532_id[] = {
729 {LM3532_NAME, 0},
730 {}
731 };
732 MODULE_DEVICE_TABLE(i2c, lm3532_id);
733
734 static struct i2c_driver lm3532_i2c_driver = {
735 .probe = lm3532_probe,
736 .id_table = lm3532_id,
737 .driver = {
738 .name = LM3532_NAME,
739 .of_match_table = of_lm3532_leds_match,
740 },
741 };
742 module_i2c_driver(lm3532_i2c_driver);
743
744 MODULE_DESCRIPTION("Back Light driver for LM3532");
745 MODULE_LICENSE("GPL v2");
746 MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
747