1 // SPDX-License-Identifier: GPL-2.0-only
3  * TI LP8860 4-Channel LED Driver
21 #define LP8860_DISP_CL1_BRT_MSB		0x00
22 #define LP8860_DISP_CL1_BRT_LSB		0x01
23 #define LP8860_DISP_CL1_CURR_MSB	0x02
24 #define LP8860_DISP_CL1_CURR_LSB	0x03
25 #define LP8860_CL2_BRT_MSB		0x04
26 #define LP8860_CL2_BRT_LSB		0x05
27 #define LP8860_CL2_CURRENT		0x06
28 #define LP8860_CL3_BRT_MSB		0x07
29 #define LP8860_CL3_BRT_LSB		0x08
30 #define LP8860_CL3_CURRENT		0x09
31 #define LP8860_CL4_BRT_MSB		0x0a
32 #define LP8860_CL4_BRT_LSB		0x0b
33 #define LP8860_CL4_CURRENT		0x0c
34 #define LP8860_CONFIG			0x0d
35 #define LP8860_STATUS			0x0e
36 #define LP8860_FAULT			0x0f
37 #define LP8860_LED_FAULT		0x10
38 #define LP8860_FAULT_CLEAR		0x11
39 #define LP8860_ID			0x12
40 #define LP8860_TEMP_MSB			0x13
41 #define LP8860_TEMP_LSB			0x14
42 #define LP8860_DISP_LED_CURR_MSB	0x15
43 #define LP8860_DISP_LED_CURR_LSB	0x16
44 #define LP8860_DISP_LED_PWM_MSB		0x17
45 #define LP8860_DISP_LED_PWM_LSB		0x18
46 #define LP8860_EEPROM_CNTRL		0x19
47 #define LP8860_EEPROM_UNLOCK		0x1a
49 #define LP8860_EEPROM_REG_0		0x60
50 #define LP8860_EEPROM_REG_1		0x61
51 #define LP8860_EEPROM_REG_2		0x62
52 #define LP8860_EEPROM_REG_3		0x63
53 #define LP8860_EEPROM_REG_4		0x64
54 #define LP8860_EEPROM_REG_5		0x65
55 #define LP8860_EEPROM_REG_6		0x66
56 #define LP8860_EEPROM_REG_7		0x67
57 #define LP8860_EEPROM_REG_8		0x68
58 #define LP8860_EEPROM_REG_9		0x69
59 #define LP8860_EEPROM_REG_10		0x6a
60 #define LP8860_EEPROM_REG_11		0x6b
61 #define LP8860_EEPROM_REG_12		0x6c
62 #define LP8860_EEPROM_REG_13		0x6d
63 #define LP8860_EEPROM_REG_14		0x6e
64 #define LP8860_EEPROM_REG_15		0x6f
65 #define LP8860_EEPROM_REG_16		0x70
66 #define LP8860_EEPROM_REG_17		0x71
67 #define LP8860_EEPROM_REG_18		0x72
68 #define LP8860_EEPROM_REG_19		0x73
69 #define LP8860_EEPROM_REG_20		0x74
70 #define LP8860_EEPROM_REG_21		0x75
71 #define LP8860_EEPROM_REG_22		0x76
72 #define LP8860_EEPROM_REG_23		0x77
73 #define LP8860_EEPROM_REG_24		0x78
75 #define LP8860_LOCK_EEPROM		0x00
76 #define LP8860_UNLOCK_EEPROM		0x01
77 #define LP8860_PROGRAM_EEPROM		0x02
78 #define LP8860_EEPROM_CODE_1		0x08
79 #define LP8860_EEPROM_CODE_2		0xba
80 #define LP8860_EEPROM_CODE_3		0xef
82 #define LP8860_CLEAR_FAULTS		0x01
90  * @led_dev: led class device pointer
103 	{ LP8860_EEPROM_REG_0, 0xed },
104 	{ LP8860_EEPROM_REG_1, 0xdf },
105 	{ LP8860_EEPROM_REG_2, 0xdc },
106 	{ LP8860_EEPROM_REG_3, 0xf0 },
107 	{ LP8860_EEPROM_REG_4, 0xdf },
108 	{ LP8860_EEPROM_REG_5, 0xe5 },
109 	{ LP8860_EEPROM_REG_6, 0xf2 },
110 	{ LP8860_EEPROM_REG_7, 0x77 },
111 	{ LP8860_EEPROM_REG_8, 0x77 },
112 	{ LP8860_EEPROM_REG_9, 0x71 },
113 	{ LP8860_EEPROM_REG_10, 0x3f },
114 	{ LP8860_EEPROM_REG_11, 0xb7 },
115 	{ LP8860_EEPROM_REG_12, 0x17 },
116 	{ LP8860_EEPROM_REG_13, 0xef },
117 	{ LP8860_EEPROM_REG_14, 0xb0 },
118 	{ LP8860_EEPROM_REG_15, 0x87 },
119 	{ LP8860_EEPROM_REG_16, 0xce },
120 	{ LP8860_EEPROM_REG_17, 0x72 },
121 	{ LP8860_EEPROM_REG_18, 0xe5 },
122 	{ LP8860_EEPROM_REG_19, 0xdf },
123 	{ LP8860_EEPROM_REG_20, 0x35 },
124 	{ LP8860_EEPROM_REG_21, 0x06 },
125 	{ LP8860_EEPROM_REG_22, 0xdc },
126 	{ LP8860_EEPROM_REG_23, 0x88 },
127 	{ LP8860_EEPROM_REG_24, 0x3E },
130 static int lp8860_unlock_eeprom(struct lp8860_led *led)  in lp8860_unlock_eeprom()  argument
134 	guard(mutex)(&led->lock);  in lp8860_unlock_eeprom()
136 	ret = regmap_write(led->regmap, LP8860_EEPROM_UNLOCK, LP8860_EEPROM_CODE_1);  in lp8860_unlock_eeprom()
138 		dev_err(&led->client->dev, "EEPROM Unlock failed\n");  in lp8860_unlock_eeprom()
142 	ret = regmap_write(led->regmap, LP8860_EEPROM_UNLOCK, LP8860_EEPROM_CODE_2);  in lp8860_unlock_eeprom()
144 		dev_err(&led->client->dev, "EEPROM Unlock failed\n");  in lp8860_unlock_eeprom()
147 	ret = regmap_write(led->regmap, LP8860_EEPROM_UNLOCK, LP8860_EEPROM_CODE_3);  in lp8860_unlock_eeprom()
149 		dev_err(&led->client->dev, "EEPROM Unlock failed\n");  in lp8860_unlock_eeprom()
156 static int lp8860_fault_check(struct lp8860_led *led)  in lp8860_fault_check()  argument
161 	ret = regmap_read(led->regmap, LP8860_LED_FAULT, &read_buf);  in lp8860_fault_check()
167 	ret = regmap_read(led->regmap, LP8860_FAULT, &read_buf);  in lp8860_fault_check()
175 		ret = regmap_write(led->regmap, LP8860_FAULT_CLEAR,  in lp8860_fault_check()
184 	struct lp8860_led *led =  in lp8860_brightness_set()  local
189 	guard(mutex)(&led->lock);  in lp8860_brightness_set()
191 	ret = lp8860_fault_check(led);  in lp8860_brightness_set()
193 		dev_err(&led->client->dev, "Cannot read/clear faults\n");  in lp8860_brightness_set()
197 	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_MSB,  in lp8860_brightness_set()
198 			(disp_brightness & 0xff00) >> 8);  in lp8860_brightness_set()
200 		dev_err(&led->client->dev, "Cannot write CL1 MSB\n");  in lp8860_brightness_set()
204 	ret = regmap_write(led->regmap, LP8860_DISP_CL1_BRT_LSB,  in lp8860_brightness_set()
205 			disp_brightness & 0xff);  in lp8860_brightness_set()
207 		dev_err(&led->client->dev, "Cannot write CL1 LSB\n");  in lp8860_brightness_set()
211 	return 0;  in lp8860_brightness_set()
214 static int lp8860_init(struct lp8860_led *led)  in lp8860_init()  argument
219 	ret = lp8860_fault_check(led);  in lp8860_init()
223 	ret = regmap_read(led->regmap, LP8860_STATUS, &read_buf);  in lp8860_init()
227 	ret = lp8860_unlock_eeprom(led);  in lp8860_init()
229 		dev_err(&led->client->dev, "Failed unlocking EEPROM\n");  in lp8860_init()
234 	ret = regmap_multi_reg_write(led->eeprom_regmap, lp8860_eeprom_disp_regs, reg_count);  in lp8860_init()
236 		dev_err(&led->client->dev, "Failed writing EEPROM\n");  in lp8860_init()
240 	ret = regmap_write(led->regmap, LP8860_EEPROM_UNLOCK, LP8860_LOCK_EEPROM);  in lp8860_init()
244 	ret = regmap_write(led->regmap,  in lp8860_init()
248 		dev_err(&led->client->dev, "Failed programming EEPROM\n");  in lp8860_init()
276 	gpiod_set_value(gpio, 0);  in lp8860_disable_gpio()
282 	struct lp8860_led *led;  in lp8860_probe()  local
283 	struct device_node *np = dev_of_node(&client->dev);  in lp8860_probe()
288 	led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);  in lp8860_probe()
289 	if (!led)  in lp8860_probe()
290 		return -ENOMEM;  in lp8860_probe()
294 		return -EINVAL;  in lp8860_probe()
296 	enable_gpio = devm_gpiod_get_optional(&client->dev, "enable", GPIOD_OUT_LOW);  in lp8860_probe()
298 		return dev_err_probe(&client->dev, PTR_ERR(enable_gpio),  in lp8860_probe()
300 	devm_add_action_or_reset(&client->dev, lp8860_disable_gpio, enable_gpio);  in lp8860_probe()
302 	ret = devm_regulator_get_enable_optional(&client->dev, "vled");  in lp8860_probe()
303 	if (ret && ret != -ENODEV)  in lp8860_probe()
304 		return dev_err_probe(&client->dev, ret,  in lp8860_probe()
307 	led->client = client;  in lp8860_probe()
308 	led->led_dev.brightness_set_blocking = lp8860_brightness_set;  in lp8860_probe()
310 	ret = devm_mutex_init(&client->dev, &led->lock);  in lp8860_probe()
312 		return dev_err_probe(&client->dev, ret, "Failed to initialize lock\n");  in lp8860_probe()
314 	led->regmap = devm_regmap_init_i2c(client, &lp8860_regmap_config);  in lp8860_probe()
315 	if (IS_ERR(led->regmap)) {  in lp8860_probe()
316 		ret = PTR_ERR(led->regmap);  in lp8860_probe()
317 		dev_err(&client->dev, "Failed to allocate register map: %d\n",  in lp8860_probe()
322 	led->eeprom_regmap = devm_regmap_init_i2c(client, &lp8860_eeprom_regmap_config);  in lp8860_probe()
323 	if (IS_ERR(led->eeprom_regmap)) {  in lp8860_probe()
324 		ret = PTR_ERR(led->eeprom_regmap);  in lp8860_probe()
325 		dev_err(&client->dev, "Failed to allocate register map: %d\n",  in lp8860_probe()
330 	ret = lp8860_init(led);  in lp8860_probe()
338 	ret = devm_led_classdev_register_ext(&client->dev, &led->led_dev,  in lp8860_probe()
341 		dev_err(&client->dev, "led register err: %d\n", ret);  in lp8860_probe()
345 	return 0;  in lp8860_probe()
370 MODULE_DESCRIPTION("Texas Instruments LP8860 LED driver");