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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/
4 *
5 * Author: Keerthy <[email protected]>
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/module.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 int ret;
50 unsigned int otpid;
51
52 lp87565 = devm_kzalloc(&client->dev, sizeof(*lp87565), GFP_KERNEL);
53 if (!lp87565)
54 return -ENOMEM;
55
56 lp87565->dev = &client->dev;
57
58 lp87565->regmap = devm_regmap_init_i2c(client, &lp87565_regmap_config);
59 if (IS_ERR(lp87565->regmap)) {
60 ret = PTR_ERR(lp87565->regmap);
61 dev_err(lp87565->dev,
62 "Failed to initialize register map: %d\n", ret);
63 return ret;
64 }
65
66 lp87565->reset_gpio = devm_gpiod_get_optional(lp87565->dev, "reset",
67 GPIOD_OUT_LOW);
68 if (IS_ERR(lp87565->reset_gpio)) {
69 ret = PTR_ERR(lp87565->reset_gpio);
70 if (ret == -EPROBE_DEFER)
71 return ret;
72 }
73
74 if (lp87565->reset_gpio) {
75 gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
76 /* The minimum assertion time is undocumented, just guess */
77 usleep_range(2000, 4000);
78
79 gpiod_set_value_cansleep(lp87565->reset_gpio, 0);
80 /* Min 1.2 ms before first I2C transaction */
81 usleep_range(1500, 3000);
82 }
83
84 ret = regmap_read(lp87565->regmap, LP87565_REG_OTP_REV, &otpid);
85 if (ret) {
86 dev_err(lp87565->dev, "Failed to read OTP ID\n");
87 return ret;
88 }
89
90 lp87565->rev = otpid & LP87565_OTP_REV_OTP_ID;
91 lp87565->dev_type = (uintptr_t)i2c_get_match_data(client);
92
93 i2c_set_clientdata(client, lp87565);
94
95 return devm_mfd_add_devices(lp87565->dev, PLATFORM_DEVID_AUTO,
96 lp87565_cells, ARRAY_SIZE(lp87565_cells),
97 NULL, 0, NULL);
98}
99
100static void lp87565_shutdown(struct i2c_client *client)
101{
102 struct lp87565 *lp87565 = i2c_get_clientdata(client);
103
104 gpiod_set_value_cansleep(lp87565->reset_gpio, 1);
105}
106
107static const struct i2c_device_id lp87565_id_table[] = {
108 { "lp87565-q1" },
109 { }
110};
111MODULE_DEVICE_TABLE(i2c, lp87565_id_table);
112
113static struct i2c_driver lp87565_driver = {
114 .driver = {
115 .name = "lp87565",
116 .of_match_table = of_lp87565_match_table,
117 },
118 .probe = lp87565_probe,
119 .shutdown = lp87565_shutdown,
120 .id_table = lp87565_id_table,
121};
122module_i2c_driver(lp87565_driver);
123
124MODULE_AUTHOR("J Keerthy <[email protected]>");
125MODULE_DESCRIPTION("lp87565 chip family Multi-Function Device driver");
126MODULE_LICENSE("GPL v2");