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(dev: &client->dev, size: 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(ptr: lp87565->regmap)) {
61 ret = PTR_ERR(ptr: 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(dev: lp87565->dev, con_id: "reset",
68 flags: GPIOD_OUT_LOW);
69 if (IS_ERR(ptr: lp87565->reset_gpio)) {
70 ret = PTR_ERR(ptr: lp87565->reset_gpio);
71 if (ret == -EPROBE_DEFER)
72 return ret;
73 }
74
75 if (lp87565->reset_gpio) {
76 gpiod_set_value_cansleep(desc: lp87565->reset_gpio, value: 1);
77 /* The minimum assertion time is undocumented, just guess */
78 usleep_range(min: 2000, max: 4000);
79
80 gpiod_set_value_cansleep(desc: lp87565->reset_gpio, value: 0);
81 /* Min 1.2 ms before first I2C transaction */
82 usleep_range(min: 1500, max: 3000);
83 }
84
85 ret = regmap_read(map: lp87565->regmap, LP87565_REG_OTP_REV, val: &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, data: lp87565);
95
96 return devm_mfd_add_devices(dev: lp87565->dev, PLATFORM_DEVID_AUTO,
97 cells: lp87565_cells, ARRAY_SIZE(lp87565_cells),
98 NULL, irq_base: 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(desc: lp87565->reset_gpio, value: 1);
106}
107
108static const struct i2c_device_id lp87565_id_table[] = {
109 { "lp87565-q1" },
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

source code of linux/drivers/mfd/lp87565.c