tjh.dev
Linux kernel mirror (for testing)
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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");