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}; |
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 | |
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}; |
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(table: &als_avrg_table[0], LM3532_NUM_AVG_VALS, |
279 | value: avg_time); |
280 | } |
281 | |
282 | static const int ramp_table[LM3532_NUM_RAMP_VALS] = { 8, 1024, 2048, 4096, 8192, |
283 | 16384, 32768, 65536}; |
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(table: &ramp_table[0], LM3532_NUM_RAMP_VALS, |
293 | value: ramp_time); |
294 | } |
295 | |
296 | /* Caller must take care of locking */ |
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(map: led_data->priv->regmap, LM3532_REG_ENABLE, |
306 | mask: ctrl_en_val, 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(regulator: 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 */ |
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(map: led_data->priv->regmap, LM3532_REG_ENABLE, |
331 | mask: ctrl_en_val, 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(regulator: led_data->priv->regulator); |
338 | if (ret < 0) |
339 | return ret; |
340 | |
341 | led_data->enabled = 0; |
342 | |
343 | return 0; |
344 | } |
345 | |
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_data: led); |
359 | else |
360 | ret = lm3532_led_disable(led_data: led); |
361 | |
362 | goto unlock; |
363 | } |
364 | |
365 | if (brt_val == LED_OFF) { |
366 | ret = lm3532_led_disable(led_data: led); |
367 | goto unlock; |
368 | } |
369 | |
370 | ret = lm3532_led_enable(led_data: 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(map: led->priv->regmap, reg: brightness_reg, val: brt_val); |
378 | |
379 | unlock: |
380 | mutex_unlock(lock: &led->priv->lock); |
381 | return ret; |
382 | } |
383 | |
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(desc: drvdata->enable_gpio, value: 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(map: drvdata->regmap, reg: brightness_config_reg, |
406 | val: &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(map: drvdata->regmap, reg: brightness_config_reg, |
413 | val: 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(map: drvdata->regmap, reg: fs_current_reg, |
423 | val: 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(map: drvdata->regmap, LM3532_REG_OUTPUT_CFG, |
435 | mask: output_cfg_mask, val: 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(map: drvdata->regmap, LM3532_REG_RT_RAMP, |
443 | val: runtime_ramp_val); |
444 | } |
445 | |
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(map: priv->regmap, reg: zone_reg, val: als->zones_lo[i]); |
468 | if (ret) |
469 | return ret; |
470 | |
471 | zone_reg += 1; |
472 | ret = regmap_write(map: priv->regmap, reg: zone_reg, val: 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(map: priv->regmap, LM3532_ALS_CONFIG, val: als->config); |
481 | } |
482 | |
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(dev: priv->dev, size: sizeof(*als), GFP_KERNEL); |
491 | if (als == NULL) |
492 | return -ENOMEM; |
493 | |
494 | ret = device_property_read_u32(dev: &priv->client->dev, propname: "ti,als-vmin" , |
495 | val: &als->als_vmin); |
496 | if (ret) |
497 | als->als_vmin = 0; |
498 | |
499 | ret = device_property_read_u32(dev: &priv->client->dev, propname: "ti,als-vmax" , |
500 | val: &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(dev: &priv->client->dev, propname: "ti,als1-imp-sel" , |
510 | val: &als_impedance); |
511 | if (ret) |
512 | als->als1_imp_sel = 0; |
513 | else |
514 | als->als1_imp_sel = lm3532_get_als_imp_index(als_imped: als_impedance); |
515 | |
516 | ret = device_property_read_u32(dev: &priv->client->dev, propname: "ti,als2-imp-sel" , |
517 | val: &als_impedance); |
518 | if (ret) |
519 | als->als2_imp_sel = 0; |
520 | else |
521 | als->als2_imp_sel = lm3532_get_als_imp_index(als_imped: als_impedance); |
522 | |
523 | ret = device_property_read_u32(dev: &priv->client->dev, propname: "ti,als-avrg-time-us" , |
524 | val: &als_avg_time); |
525 | if (ret) |
526 | als->als_avrg_time = 0; |
527 | else |
528 | als->als_avrg_time = lm3532_get_als_avg_index(avg_time: als_avg_time); |
529 | |
530 | ret = device_property_read_u8(dev: &priv->client->dev, propname: "ti,als-input-mode" , |
531 | val: &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 | |
545 | static int lm3532_parse_node(struct lm3532_data *priv) |
546 | { |
547 | struct fwnode_handle *child = NULL; |
548 | struct lm3532_led *led; |
549 | int control_bank; |
550 | u32 ramp_time; |
551 | size_t i = 0; |
552 | int ret; |
553 | |
554 | priv->enable_gpio = devm_gpiod_get_optional(dev: &priv->client->dev, |
555 | con_id: "enable" , flags: GPIOD_OUT_LOW); |
556 | if (IS_ERR(ptr: priv->enable_gpio)) |
557 | priv->enable_gpio = NULL; |
558 | |
559 | priv->regulator = devm_regulator_get(dev: &priv->client->dev, id: "vin" ); |
560 | if (IS_ERR(ptr: priv->regulator)) |
561 | priv->regulator = NULL; |
562 | |
563 | ret = device_property_read_u32(dev: &priv->client->dev, propname: "ramp-up-us" , |
564 | val: &ramp_time); |
565 | if (ret) |
566 | dev_info(&priv->client->dev, "ramp-up-ms property missing\n" ); |
567 | else |
568 | priv->runtime_ramp_up = lm3532_get_ramp_index(ramp_time); |
569 | |
570 | ret = device_property_read_u32(dev: &priv->client->dev, propname: "ramp-down-us" , |
571 | val: &ramp_time); |
572 | if (ret) |
573 | dev_info(&priv->client->dev, "ramp-down-ms property missing\n" ); |
574 | else |
575 | priv->runtime_ramp_down = lm3532_get_ramp_index(ramp_time); |
576 | |
577 | device_for_each_child_node(priv->dev, child) { |
578 | struct led_init_data idata = { |
579 | .fwnode = child, |
580 | .default_label = ":" , |
581 | .devicename = priv->client->name, |
582 | }; |
583 | |
584 | led = &priv->leds[i]; |
585 | |
586 | ret = fwnode_property_read_u32(fwnode: child, propname: "reg" , val: &control_bank); |
587 | if (ret) { |
588 | dev_err(&priv->client->dev, "reg property missing\n" ); |
589 | goto child_out; |
590 | } |
591 | |
592 | if (control_bank > LM3532_CONTROL_C) { |
593 | dev_err(&priv->client->dev, "Control bank invalid\n" ); |
594 | continue; |
595 | } |
596 | |
597 | led->control_bank = control_bank; |
598 | |
599 | ret = fwnode_property_read_u32(fwnode: child, propname: "ti,led-mode" , |
600 | val: &led->mode); |
601 | if (ret) { |
602 | dev_err(&priv->client->dev, "ti,led-mode property missing\n" ); |
603 | goto child_out; |
604 | } |
605 | |
606 | if (fwnode_property_present(fwnode: child, propname: "led-max-microamp" ) && |
607 | fwnode_property_read_u32(fwnode: child, propname: "led-max-microamp" , |
608 | val: &led->full_scale_current)) |
609 | dev_err(&priv->client->dev, |
610 | "Failed getting led-max-microamp\n" ); |
611 | else |
612 | led->full_scale_current = min(led->full_scale_current, |
613 | LM3532_FS_CURR_MAX); |
614 | |
615 | if (led->mode == LM3532_BL_MODE_ALS) { |
616 | led->mode = LM3532_ALS_CTRL; |
617 | ret = lm3532_parse_als(priv); |
618 | if (ret) |
619 | dev_err(&priv->client->dev, "Failed to parse als\n" ); |
620 | else |
621 | lm3532_als_configure(priv, led); |
622 | } else { |
623 | led->mode = LM3532_I2C_CTRL; |
624 | } |
625 | |
626 | led->num_leds = fwnode_property_count_u32(fwnode: child, propname: "led-sources" ); |
627 | if (led->num_leds > LM3532_MAX_LED_STRINGS) { |
628 | dev_err(&priv->client->dev, "Too many LED string defined\n" ); |
629 | continue; |
630 | } |
631 | |
632 | ret = fwnode_property_read_u32_array(fwnode: child, propname: "led-sources" , |
633 | val: led->led_strings, |
634 | nval: led->num_leds); |
635 | if (ret) { |
636 | dev_err(&priv->client->dev, "led-sources property missing\n" ); |
637 | goto child_out; |
638 | } |
639 | |
640 | led->priv = priv; |
641 | led->led_dev.brightness_set_blocking = lm3532_brightness_set; |
642 | |
643 | ret = devm_led_classdev_register_ext(parent: priv->dev, led_cdev: &led->led_dev, init_data: &idata); |
644 | if (ret) { |
645 | dev_err(&priv->client->dev, "led register err: %d\n" , |
646 | ret); |
647 | goto child_out; |
648 | } |
649 | |
650 | ret = lm3532_init_registers(led); |
651 | if (ret) { |
652 | dev_err(&priv->client->dev, "register init err: %d\n" , |
653 | ret); |
654 | goto child_out; |
655 | } |
656 | |
657 | i++; |
658 | } |
659 | return 0; |
660 | |
661 | child_out: |
662 | fwnode_handle_put(fwnode: child); |
663 | return ret; |
664 | } |
665 | |
666 | static int lm3532_probe(struct i2c_client *client) |
667 | { |
668 | struct lm3532_data *drvdata; |
669 | int ret = 0; |
670 | int count; |
671 | |
672 | count = device_get_child_node_count(dev: &client->dev); |
673 | if (!count) { |
674 | dev_err(&client->dev, "LEDs are not defined in device tree!" ); |
675 | return -ENODEV; |
676 | } |
677 | |
678 | drvdata = devm_kzalloc(dev: &client->dev, struct_size(drvdata, leds, count), |
679 | GFP_KERNEL); |
680 | if (drvdata == NULL) |
681 | return -ENOMEM; |
682 | |
683 | drvdata->client = client; |
684 | drvdata->dev = &client->dev; |
685 | |
686 | drvdata->regmap = devm_regmap_init_i2c(client, &lm3532_regmap_config); |
687 | if (IS_ERR(ptr: drvdata->regmap)) { |
688 | ret = PTR_ERR(ptr: drvdata->regmap); |
689 | dev_err(&client->dev, "Failed to allocate register map: %d\n" , |
690 | ret); |
691 | return ret; |
692 | } |
693 | |
694 | mutex_init(&drvdata->lock); |
695 | i2c_set_clientdata(client, data: drvdata); |
696 | |
697 | ret = lm3532_parse_node(priv: drvdata); |
698 | if (ret) { |
699 | dev_err(&client->dev, "Failed to parse node\n" ); |
700 | return ret; |
701 | } |
702 | |
703 | return ret; |
704 | } |
705 | |
706 | static void lm3532_remove(struct i2c_client *client) |
707 | { |
708 | struct lm3532_data *drvdata = i2c_get_clientdata(client); |
709 | |
710 | mutex_destroy(lock: &drvdata->lock); |
711 | |
712 | if (drvdata->enable_gpio) |
713 | gpiod_direction_output(desc: drvdata->enable_gpio, value: 0); |
714 | } |
715 | |
716 | static const struct of_device_id of_lm3532_leds_match[] = { |
717 | { .compatible = "ti,lm3532" , }, |
718 | {}, |
719 | }; |
720 | MODULE_DEVICE_TABLE(of, of_lm3532_leds_match); |
721 | |
722 | static const struct i2c_device_id lm3532_id[] = { |
723 | {LM3532_NAME, 0}, |
724 | {} |
725 | }; |
726 | MODULE_DEVICE_TABLE(i2c, lm3532_id); |
727 | |
728 | static struct i2c_driver lm3532_i2c_driver = { |
729 | .probe = lm3532_probe, |
730 | .remove = lm3532_remove, |
731 | .id_table = lm3532_id, |
732 | .driver = { |
733 | .name = LM3532_NAME, |
734 | .of_match_table = of_lm3532_leds_match, |
735 | }, |
736 | }; |
737 | module_i2c_driver(lm3532_i2c_driver); |
738 | |
739 | MODULE_DESCRIPTION("Back Light driver for LM3532" ); |
740 | MODULE_LICENSE("GPL v2" ); |
741 | MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>" ); |
742 | |