1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * TI LP8501 9 channel LED Driver
  4 *
  5 * Copyright (C) 2013 Texas Instruments
  6 *
  7 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
  8 */
  9
 10#include <linux/delay.h>
 11#include <linux/firmware.h>
 12#include <linux/i2c.h>
 13#include <linux/init.h>
 14#include <linux/leds.h>
 15#include <linux/module.h>
 16#include <linux/mutex.h>
 17#include <linux/of.h>
 18#include <linux/platform_data/leds-lp55xx.h>
 19#include <linux/slab.h>
 20
 21#include "leds-lp55xx-common.h"
 22
 23#define LP8501_PAGES_PER_ENGINE		1
 24#define LP8501_MAX_LEDS			9
 25
 26/* Registers */
 27#define LP8501_REG_ENABLE		0x00
 28#define LP8501_ENABLE			BIT(6)
 29
 30#define LP8501_REG_OP_MODE		0x01
 31
 32#define LP8501_REG_PWR_CONFIG		0x05
 33#define LP8501_PWR_CONFIG_M		0x03
 34
 35#define LP8501_REG_LED_PWM_BASE		0x16
 36
 37#define LP8501_REG_LED_CURRENT_BASE	0x26
 38
 39#define LP8501_REG_CONFIG		0x36
 40#define LP8501_PWM_PSAVE		BIT(7)
 41#define LP8501_AUTO_INC			BIT(6)
 42#define LP8501_PWR_SAVE			BIT(5)
 43#define LP8501_CP_MODE_MASK		0x18
 44#define LP8501_CP_MODE_SHIFT		3
 45#define LP8501_INT_CLK			BIT(0)
 46#define LP8501_DEFAULT_CFG (LP8501_PWM_PSAVE | LP8501_AUTO_INC | LP8501_PWR_SAVE)
 47
 48#define LP8501_REG_STATUS		0x3A
 49#define LP8501_ENGINE_BUSY		BIT(4)
 50
 51#define LP8501_REG_RESET		0x3D
 52#define LP8501_RESET			0xFF
 53
 54#define LP8501_REG_PROG_MEM		0x50
 55
 56static int lp8501_post_init_device(struct lp55xx_chip *chip)
 57{
 58	int ret;
 59	u8 val = LP8501_DEFAULT_CFG;
 60
 61	ret = lp55xx_write(chip, LP8501_REG_ENABLE, LP8501_ENABLE);
 62	if (ret)
 63		return ret;
 64
 65	/* Chip startup time is 500 us, 1 - 2 ms gives some margin */
 66	usleep_range(1000, 2000);
 67
 68	if (chip->pdata->clock_mode != LP55XX_CLOCK_EXT)
 69		val |= LP8501_INT_CLK;
 70
 71	val |= (chip->pdata->charge_pump_mode << LP8501_CP_MODE_SHIFT) & LP8501_CP_MODE_MASK;
 72
 73	ret = lp55xx_write(chip, LP8501_REG_CONFIG, val);
 74	if (ret)
 75		return ret;
 76
 77	/* Power selection for each output */
 78	return lp55xx_update_bits(chip, LP8501_REG_PWR_CONFIG,
 79				LP8501_PWR_CONFIG_M, chip->pdata->pwr_sel);
 80}
 81
 82static void lp8501_run_engine(struct lp55xx_chip *chip, bool start)
 83{
 84	/* stop engine */
 85	if (!start) {
 86		lp55xx_stop_all_engine(chip);
 87		lp55xx_turn_off_channels(chip);
 88		return;
 89	}
 90
 91	lp55xx_run_engine_common(chip);
 92}
 93
 94/* Chip specific configurations */
 95static struct lp55xx_device_config lp8501_cfg = {
 96	.reg_op_mode = {
 97		.addr = LP8501_REG_OP_MODE,
 98	},
 99	.reg_exec = {
100		.addr = LP8501_REG_ENABLE,
101	},
102	.engine_busy = {
103		.addr = LP8501_REG_STATUS,
104		.mask = LP8501_ENGINE_BUSY,
105	},
106	.reset = {
107		.addr = LP8501_REG_RESET,
108		.val  = LP8501_RESET,
109	},
110	.enable = {
111		.addr = LP8501_REG_ENABLE,
112		.val  = LP8501_ENABLE,
113	},
114	.prog_mem_base = {
115		.addr = LP8501_REG_PROG_MEM,
116	},
117	.reg_led_pwm_base = {
118		.addr = LP8501_REG_LED_PWM_BASE,
119	},
120	.reg_led_current_base = {
121		.addr = LP8501_REG_LED_CURRENT_BASE,
122	},
123	.pages_per_engine   = LP8501_PAGES_PER_ENGINE,
124	.max_channel  = LP8501_MAX_LEDS,
125	.post_init_device   = lp8501_post_init_device,
126	.brightness_fn      = lp55xx_led_brightness,
127	.set_led_current    = lp55xx_set_led_current,
128	.firmware_cb        = lp55xx_firmware_loaded_cb,
129	.run_engine         = lp8501_run_engine,
130};
131
132static const struct i2c_device_id lp8501_id[] = {
133	{ "lp8501",  .driver_data = (kernel_ulong_t)&lp8501_cfg, },
134	{ }
135};
136MODULE_DEVICE_TABLE(i2c, lp8501_id);
137
138static const struct of_device_id of_lp8501_leds_match[] = {
139	{ .compatible = "ti,lp8501", .data = &lp8501_cfg, },
140	{},
141};
142
143MODULE_DEVICE_TABLE(of, of_lp8501_leds_match);
144
145static struct i2c_driver lp8501_driver = {
146	.driver = {
147		.name	= "lp8501",
148		.of_match_table = of_lp8501_leds_match,
149	},
150	.probe		= lp55xx_probe,
151	.remove		= lp55xx_remove,
152	.id_table	= lp8501_id,
153};
154
155module_i2c_driver(lp8501_driver);
156
157MODULE_DESCRIPTION("Texas Instruments LP8501 LED driver");
158MODULE_AUTHOR("Milo Kim");
159MODULE_LICENSE("GPL");