xref: /kernel/linux/linux-6.6/drivers/mfd/lp87565.c (revision 62306a36) 
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
4 *
5 * Author: Keerthy <j-keerthy@ti.com>
6 */
7
8#include <linux/gpio/consumer.h>
9#include <linux/interrupt.h>
10#include <linux/mfd/core.h>
11#include <linux/module.h>
12#include <linux/of_device.h>
13#include <linux/regmap.h>
14
15#include <linux/mfd/lp87565.h>
16
17static const struct regmap_config lp87565_regmap_config = {
18	.reg_bits = 8,
19	.val_bits = 8,
20	.max_register = LP87565_REG_MAX,
21};
22
23static const struct mfd_cell lp87565_cells[] = {
24	{ .name = "lp87565-q1-regulator", },
25	{ .name = "lp87565-q1-gpio", },
26};
27
28static const struct of_device_id of_lp87565_match_table[] = {
29	{ .compatible = "ti,lp87565", },
30	{
31		.compatible = "ti,lp87524-q1",
32		.data = (void *)LP87565_DEVICE_TYPE_LP87524_Q1,
33	},
34	{
35		.compatible = "ti,lp87565-q1",
36		.data = (void *)LP87565_DEVICE_TYPE_LP87565_Q1,
37	},
38	{
39		.compatible = "ti,lp87561-q1",
40		.data = (void *)LP87565_DEVICE_TYPE_LP87561_Q1,
41	},
42	{}
43};
44MODULE_DEVICE_TABLE(of, of_lp87565_match_table);
45
46static int lp87565_probe(struct i2c_client *client)
47{
48	struct lp87565 *lp87565;
49	const struct of_device_id *of_id;
50	int ret;
51	unsigned int otpid;
52
53	lp87565 = devm_kzalloc(&client->dev, sizeof(*lp87565), GFP_KERNEL);
54	if (!lp87565)
55		return -ENOMEM;
56
57	lp87565->dev = &client->dev;
58
59	lp87565->regmap = devm_regmap_init_i2c(client, &lp87565_regmap_config);
60	if (IS_ERR(lp87565->regmap)) {
61		ret = PTR_ERR(lp87565->regmap);
62		dev_err(lp87565->dev,
63			"Failed to initialize register map: %d\n", ret);
64		return ret;
65	}
66
67	lp87565->reset_gpio = devm_gpiod_get_optional(lp87565->dev, "reset",
68						      GPIOD_OUT_LOW);
69	if (IS_ERR(lp87565->reset_gpio)) {
70		ret = PTR_ERR(lp87565->reset_gpio);
71		if (ret == -EPROBE_DEFER)
72			return ret;
73	}
74
75	if (lp87565->reset_gpio) {
76		gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
77		/* The minimum assertion time is undocumented, just guess */
78		usleep_range(2000, 4000);
79
80		gpiod_set_value_cansleep(lp87565->reset_gpio, 0);
81		/* Min 1.2 ms before first I2C transaction */
82		usleep_range(1500, 3000);
83	}
84
85	ret = regmap_read(lp87565->regmap, LP87565_REG_OTP_REV, &otpid);
86	if (ret) {
87		dev_err(lp87565->dev, "Failed to read OTP ID\n");
88		return ret;
89	}
90
91	lp87565->rev = otpid & LP87565_OTP_REV_OTP_ID;
92
93	of_id = of_match_device(of_lp87565_match_table, &client->dev);
94	if (of_id)
95		lp87565->dev_type = (uintptr_t)of_id->data;
96
97	i2c_set_clientdata(client, lp87565);
98
99	return devm_mfd_add_devices(lp87565->dev, PLATFORM_DEVID_AUTO,
100				    lp87565_cells, ARRAY_SIZE(lp87565_cells),
101				    NULL, 0, NULL);
102}
103
104static void lp87565_shutdown(struct i2c_client *client)
105{
106	struct lp87565 *lp87565 = i2c_get_clientdata(client);
107
108	gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
109}
110
111static const struct i2c_device_id lp87565_id_table[] = {
112	{ "lp87565-q1", 0 },
113	{ },
114};
115MODULE_DEVICE_TABLE(i2c, lp87565_id_table);
116
117static struct i2c_driver lp87565_driver = {
118	.driver	= {
119		.name	= "lp87565",
120		.of_match_table = of_lp87565_match_table,
121	},
122	.probe = lp87565_probe,
123	.shutdown = lp87565_shutdown,
124	.id_table = lp87565_id_table,
125};
126module_i2c_driver(lp87565_driver);
127
128MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
129MODULE_DESCRIPTION("lp87565 chip family Multi-Function Device driver");
130MODULE_LICENSE("GPL v2");
131