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/i2c.h>
10#include <linux/interrupt.h>
11#include <linux/mfd/core.h>
12#include <linux/mod_devicetable.h>
13#include <linux/module.h>
14#include <linux/regmap.h>
15
16#include <linux/mfd/lp87565.h>
17
18static const struct regmap_config lp87565_regmap_config = {
19	.reg_bits = 8,
20	.val_bits = 8,
21	.max_register = LP87565_REG_MAX,
22};
23
24static const struct mfd_cell lp87565_cells[] = {
25	{ .name = "lp87565-q1-regulator", },
26	{ .name = "lp87565-q1-gpio", },
27};
28
29static const struct of_device_id of_lp87565_match_table[] = {
30	{ .compatible = "ti,lp87565", },
31	{
32		.compatible = "ti,lp87524-q1",
33		.data = (void *)LP87565_DEVICE_TYPE_LP87524_Q1,
34	},
35	{
36		.compatible = "ti,lp87565-q1",
37		.data = (void *)LP87565_DEVICE_TYPE_LP87565_Q1,
38	},
39	{
40		.compatible = "ti,lp87561-q1",
41		.data = (void *)LP87565_DEVICE_TYPE_LP87561_Q1,
42	},
43	{}
44};
45MODULE_DEVICE_TABLE(of, of_lp87565_match_table);
46
47static int lp87565_probe(struct i2c_client *client)
48{
49	struct lp87565 *lp87565;
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	lp87565->dev_type = (uintptr_t)i2c_get_match_data(client);
93
94	i2c_set_clientdata(client, lp87565);
95
96	return devm_mfd_add_devices(lp87565->dev, PLATFORM_DEVID_AUTO,
97				    lp87565_cells, ARRAY_SIZE(lp87565_cells),
98				    NULL, 0, NULL);
99}
100
101static void lp87565_shutdown(struct i2c_client *client)
102{
103	struct lp87565 *lp87565 = i2c_get_clientdata(client);
104
105	gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
106}
107
108static const struct i2c_device_id lp87565_id_table[] = {
109	{ "lp87565-q1", 0 },
110	{ },
111};
112MODULE_DEVICE_TABLE(i2c, lp87565_id_table);
113
114static struct i2c_driver lp87565_driver = {
115	.driver	= {
116		.name	= "lp87565",
117		.of_match_table = of_lp87565_match_table,
118	},
119	.probe = lp87565_probe,
120	.shutdown = lp87565_shutdown,
121	.id_table = lp87565_id_table,
122};
123module_i2c_driver(lp87565_driver);
124
125MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
126MODULE_DESCRIPTION("lp87565 chip family Multi-Function Device driver");
127MODULE_LICENSE("GPL v2");
128