1 // SPDX-License-Identifier: GPL-2.0-only
3  * TI LP8860 4-Channel LED Driver
22 #define LP8860_DISP_CL1_BRT_MSB		0x00
23 #define LP8860_DISP_CL1_BRT_LSB		0x01
24 #define LP8860_DISP_CL1_CURR_MSB	0x02
25 #define LP8860_DISP_CL1_CURR_LSB	0x03
26 #define LP8860_CL2_BRT_MSB		0x04
27 #define LP8860_CL2_BRT_LSB		0x05
28 #define LP8860_CL2_CURRENT		0x06
29 #define LP8860_CL3_BRT_MSB		0x07
30 #define LP8860_CL3_BRT_LSB		0x08
31 #define LP8860_CL3_CURRENT		0x09
32 #define LP8860_CL4_BRT_MSB		0x0a
33 #define LP8860_CL4_BRT_LSB		0x0b
34 #define LP8860_CL4_CURRENT		0x0c
35 #define LP8860_CONFIG			0x0d
36 #define LP8860_STATUS			0x0e
37 #define LP8860_FAULT			0x0f
38 #define LP8860_LED_FAULT		0x10
39 #define LP8860_FAULT_CLEAR		0x11
40 #define LP8860_ID			0x12
41 #define LP8860_TEMP_MSB			0x13
42 #define LP8860_TEMP_LSB			0x14
43 #define LP8860_DISP_LED_CURR_MSB	0x15
44 #define LP8860_DISP_LED_CURR_LSB	0x16
45 #define LP8860_DISP_LED_PWM_MSB		0x17
46 #define LP8860_DISP_LED_PWM_LSB		0x18
47 #define LP8860_EEPROM_CNTRL		0x19
48 #define LP8860_EEPROM_UNLOCK		0x1a
50 #define LP8860_EEPROM_REG_0		0x60
51 #define LP8860_EEPROM_REG_1		0x61
52 #define LP8860_EEPROM_REG_2		0x62
53 #define LP8860_EEPROM_REG_3		0x63
54 #define LP8860_EEPROM_REG_4		0x64
55 #define LP8860_EEPROM_REG_5		0x65
56 #define LP8860_EEPROM_REG_6		0x66
57 #define LP8860_EEPROM_REG_7		0x67
58 #define LP8860_EEPROM_REG_8		0x68
59 #define LP8860_EEPROM_REG_9		0x69
60 #define LP8860_EEPROM_REG_10		0x6a
61 #define LP8860_EEPROM_REG_11		0x6b
62 #define LP8860_EEPROM_REG_12		0x6c
63 #define LP8860_EEPROM_REG_13		0x6d
64 #define LP8860_EEPROM_REG_14		0x6e
65 #define LP8860_EEPROM_REG_15		0x6f
66 #define LP8860_EEPROM_REG_16		0x70
67 #define LP8860_EEPROM_REG_17		0x71
68 #define LP8860_EEPROM_REG_18		0x72
69 #define LP8860_EEPROM_REG_19		0x73
70 #define LP8860_EEPROM_REG_20		0x74
71 #define LP8860_EEPROM_REG_21		0x75
72 #define LP8860_EEPROM_REG_22		0x76
73 #define LP8860_EEPROM_REG_23		0x77
74 #define LP8860_EEPROM_REG_24		0x78
76 #define LP8860_LOCK_EEPROM		0x00
77 #define LP8860_UNLOCK_EEPROM		0x01
78 #define LP8860_PROGRAM_EEPROM		0x02
79 #define LP8860_EEPROM_CODE_1		0x08
80 #define LP8860_EEPROM_CODE_2		0xba
81 #define LP8860_EEPROM_CODE_3		0xef
83 #define LP8860_CLEAR_FAULTS		0x01
88  * struct lp8860_led -
89  * @lock - Lock for reading/writing the device
90  * @client - Pointer to the I2C client
91  * @led_dev - led class device pointer
92  * @regmap - Devices register map
93  * @eeprom_regmap - EEPROM register map
94  * @enable_gpio - VDDIO/EN gpio to enable communication interface
95  * @regulator - LED supply regulator pointer
113 	{ LP8860_EEPROM_REG_0, 0xed },
114 	{ LP8860_EEPROM_REG_1, 0xdf },
115 	{ LP8860_EEPROM_REG_2, 0xdc },
116 	{ LP8860_EEPROM_REG_3, 0xf0 },
117 	{ LP8860_EEPROM_REG_4, 0xdf },
118 	{ LP8860_EEPROM_REG_5, 0xe5 },
119 	{ LP8860_EEPROM_REG_6, 0xf2 },
120 	{ LP8860_EEPROM_REG_7, 0x77 },
121 	{ LP8860_EEPROM_REG_8, 0x77 },
122 	{ LP8860_EEPROM_REG_9, 0x71 },
123 	{ LP8860_EEPROM_REG_10, 0x3f },
124 	{ LP8860_EEPROM_REG_11, 0xb7 },
125 	{ LP8860_EEPROM_REG_12, 0x17 },
126 	{ LP8860_EEPROM_REG_13, 0xef },
127 	{ LP8860_EEPROM_REG_14, 0xb0 },
128 	{ LP8860_EEPROM_REG_15, 0x87 },
129 	{ LP8860_EEPROM_REG_16, 0xce },
130 	{ LP8860_EEPROM_REG_17, 0x72 },
131 	{ LP8860_EEPROM_REG_18, 0xe5 },
132 	{ LP8860_EEPROM_REG_19, 0xdf },
133 	{ LP8860_EEPROM_REG_20, 0x35 },
134 	{ LP8860_EEPROM_REG_21, 0x06 },
135 	{ LP8860_EEPROM_REG_22, 0xdc },
136 	{ LP8860_EEPROM_REG_23, 0x88 },
137 	{ LP8860_EEPROM_REG_24, 0x3E },
140 static int lp8860_unlock_eeprom(struct lp8860_led *led, int lock)  in lp8860_unlock_eeprom()  argument
144 	mutex_lock(&led->lock);  in lp8860_unlock_eeprom()
147 		ret = regmap_write(led->regmap,  in lp8860_unlock_eeprom()
151 			dev_err(&led->client->dev, "EEPROM Unlock failed\n");  in lp8860_unlock_eeprom()
155 		ret = regmap_write(led->regmap,  in lp8860_unlock_eeprom()
159 			dev_err(&led->client->dev, "EEPROM Unlock failed\n");  in lp8860_unlock_eeprom()
162 		ret = regmap_write(led->regmap,  in lp8860_unlock_eeprom()
166 			dev_err(&led->client->dev, "EEPROM Unlock failed\n");  in lp8860_unlock_eeprom()
170 		ret = regmap_write(led->regmap,  in lp8860_unlock_eeprom()
176 	mutex_unlock(&led->lock);  in lp8860_unlock_eeprom()
180 static int lp8860_fault_check(struct lp8860_led *led)  in lp8860_fault_check()  argument
185 	ret = regmap_read(led->regmap, LP8860_LED_FAULT, &read_buf);  in lp8860_fault_check()
191 	ret = regmap_read(led->regmap, LP8860_FAULT, &read_buf);  in lp8860_fault_check()
199 		ret = regmap_write(led->regmap, LP8860_FAULT_CLEAR,  in lp8860_fault_check()
208 	struct lp8860_led *led =  in lp8860_brightness_set()  local
213 	mutex_lock(&led->lock);  in lp8860_brightness_set()
215 	ret = lp8860_fault_check(led);  in lp8860_brightness_set()
217 		dev_err(&led->client->dev, "Cannot read/clear faults\n");  in lp8860_brightness_set()
221 	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_MSB,  in lp8860_brightness_set()
222 			(disp_brightness & 0xff00) >> 8);  in lp8860_brightness_set()
224 		dev_err(&led->client->dev, "Cannot write CL1 MSB\n");  in lp8860_brightness_set()
228 	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_LSB,  in lp8860_brightness_set()
229 			disp_brightness & 0xff);  in lp8860_brightness_set()
231 		dev_err(&led->client->dev, "Cannot write CL1 LSB\n");  in lp8860_brightness_set()
235 	mutex_unlock(&led->lock);  in lp8860_brightness_set()
239 static int lp8860_init(struct lp8860_led *led)  in lp8860_init()  argument
244 	if (led->regulator) {  in lp8860_init()
245 		ret = regulator_enable(led->regulator);  in lp8860_init()
247 			dev_err(&led->client->dev,  in lp8860_init()
253 	if (led->enable_gpio)  in lp8860_init()
254 		gpiod_direction_output(led->enable_gpio, 1);  in lp8860_init()
256 	ret = lp8860_fault_check(led);  in lp8860_init()
260 	ret = regmap_read(led->regmap, LP8860_STATUS, &read_buf);  in lp8860_init()
264 	ret = lp8860_unlock_eeprom(led, LP8860_UNLOCK_EEPROM);  in lp8860_init()
266 		dev_err(&led->client->dev, "Failed unlocking EEPROM\n");  in lp8860_init()
270 	reg_count = ARRAY_SIZE(lp8860_eeprom_disp_regs) / sizeof(lp8860_eeprom_disp_regs[0]);  in lp8860_init()
271 	for (i = 0; i < reg_count; i++) {  in lp8860_init()
272 		ret = regmap_write(led->eeprom_regmap,  in lp8860_init()
276 			dev_err(&led->client->dev, "Failed writing EEPROM\n");  in lp8860_init()
281 	ret = lp8860_unlock_eeprom(led, LP8860_LOCK_EEPROM);  in lp8860_init()
285 	ret = regmap_write(led->regmap,  in lp8860_init()
289 		dev_err(&led->client->dev, "Failed programming EEPROM\n");  in lp8860_init()
297 		if (led->enable_gpio)  in lp8860_init()
298 			gpiod_direction_output(led->enable_gpio, 0);  in lp8860_init()
300 	if (led->regulator) {  in lp8860_init()
301 		ret = regulator_disable(led->regulator);  in lp8860_init()
303 			dev_err(&led->client->dev,  in lp8860_init()
311 	{ LP8860_DISP_CL1_BRT_MSB, 0x00},
312 	{ LP8860_DISP_CL1_BRT_LSB, 0x00},
313 	{ LP8860_DISP_CL1_CURR_MSB, 0x00},
314 	{ LP8860_DISP_CL1_CURR_LSB, 0x00},
315 	{ LP8860_CL2_BRT_MSB, 0x00},
316 	{ LP8860_CL2_BRT_LSB, 0x00},
317 	{ LP8860_CL2_CURRENT, 0x00},
318 	{ LP8860_CL3_BRT_MSB, 0x00},
319 	{ LP8860_CL3_BRT_LSB, 0x00},
320 	{ LP8860_CL3_CURRENT, 0x00},
321 	{ LP8860_CL4_BRT_MSB, 0x00},
322 	{ LP8860_CL4_BRT_LSB, 0x00},
323 	{ LP8860_CL4_CURRENT, 0x00},
324 	{ LP8860_CONFIG, 0x00},
325 	{ LP8860_FAULT_CLEAR, 0x00},
326 	{ LP8860_EEPROM_CNTRL, 0x80},
327 	{ LP8860_EEPROM_UNLOCK, 0x00},
341 	{ LP8860_EEPROM_REG_0, 0x00 },
342 	{ LP8860_EEPROM_REG_1, 0x00 },
343 	{ LP8860_EEPROM_REG_2, 0x00 },
344 	{ LP8860_EEPROM_REG_3, 0x00 },
345 	{ LP8860_EEPROM_REG_4, 0x00 },
346 	{ LP8860_EEPROM_REG_5, 0x00 },
347 	{ LP8860_EEPROM_REG_6, 0x00 },
348 	{ LP8860_EEPROM_REG_7, 0x00 },
349 	{ LP8860_EEPROM_REG_8, 0x00 },
350 	{ LP8860_EEPROM_REG_9, 0x00 },
351 	{ LP8860_EEPROM_REG_10, 0x00 },
352 	{ LP8860_EEPROM_REG_11, 0x00 },
353 	{ LP8860_EEPROM_REG_12, 0x00 },
354 	{ LP8860_EEPROM_REG_13, 0x00 },
355 	{ LP8860_EEPROM_REG_14, 0x00 },
356 	{ LP8860_EEPROM_REG_15, 0x00 },
357 	{ LP8860_EEPROM_REG_16, 0x00 },
358 	{ LP8860_EEPROM_REG_17, 0x00 },
359 	{ LP8860_EEPROM_REG_18, 0x00 },
360 	{ LP8860_EEPROM_REG_19, 0x00 },
361 	{ LP8860_EEPROM_REG_20, 0x00 },
362 	{ LP8860_EEPROM_REG_21, 0x00 },
363 	{ LP8860_EEPROM_REG_22, 0x00 },
364 	{ LP8860_EEPROM_REG_23, 0x00 },
365 	{ LP8860_EEPROM_REG_24, 0x00 },
382 	struct lp8860_led *led;  in lp8860_probe()  local
383 	struct device_node *np = dev_of_node(&client->dev);  in lp8860_probe()
387 	led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);  in lp8860_probe()
388 	if (!led)  in lp8860_probe()
389 		return -ENOMEM;  in lp8860_probe()
393 		return -EINVAL;  in lp8860_probe()
395 	led->enable_gpio = devm_gpiod_get_optional(&client->dev,  in lp8860_probe()
397 	if (IS_ERR(led->enable_gpio)) {  in lp8860_probe()
398 		ret = PTR_ERR(led->enable_gpio);  in lp8860_probe()
399 		dev_err(&client->dev, "Failed to get enable gpio: %d\n", ret);  in lp8860_probe()
403 	led->regulator = devm_regulator_get(&client->dev, "vled");  in lp8860_probe()
404 	if (IS_ERR(led->regulator))  in lp8860_probe()
405 		led->regulator = NULL;  in lp8860_probe()
407 	led->client = client;  in lp8860_probe()
408 	led->led_dev.brightness_set_blocking = lp8860_brightness_set;  in lp8860_probe()
410 	mutex_init(&led->lock);  in lp8860_probe()
412 	i2c_set_clientdata(client, led);  in lp8860_probe()
414 	led->regmap = devm_regmap_init_i2c(client, &lp8860_regmap_config);  in lp8860_probe()
415 	if (IS_ERR(led->regmap)) {  in lp8860_probe()
416 		ret = PTR_ERR(led->regmap);  in lp8860_probe()
417 		dev_err(&client->dev, "Failed to allocate register map: %d\n",  in lp8860_probe()
422 	led->eeprom_regmap = devm_regmap_init_i2c(client, &lp8860_eeprom_regmap_config);  in lp8860_probe()
423 	if (IS_ERR(led->eeprom_regmap)) {  in lp8860_probe()
424 		ret = PTR_ERR(led->eeprom_regmap);  in lp8860_probe()
425 		dev_err(&client->dev, "Failed to allocate register map: %d\n",  in lp8860_probe()
430 	ret = lp8860_init(led);  in lp8860_probe()
438 	ret = devm_led_classdev_register_ext(&client->dev, &led->led_dev,  in lp8860_probe()
441 		dev_err(&client->dev, "led register err: %d\n", ret);  in lp8860_probe()
445 	return 0;  in lp8860_probe()
450 	struct lp8860_led *led = i2c_get_clientdata(client);  in lp8860_remove()  local
453 	if (led->enable_gpio)  in lp8860_remove()
454 		gpiod_direction_output(led->enable_gpio, 0);  in lp8860_remove()
456 	if (led->regulator) {  in lp8860_remove()
457 		ret = regulator_disable(led->regulator);  in lp8860_remove()
459 			dev_err(&led->client->dev,  in lp8860_remove()
463 	mutex_destroy(&led->lock);  in lp8860_remove()
465 	return 0;  in lp8860_remove()
469 	{ "lp8860", 0 },
491 MODULE_DESCRIPTION("Texas Instruments LP8860 LED driver");