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
17 static const struct regmap_config lp87565_regmap_config = {
18 .reg_bits = 8,
19 .val_bits = 8,
20 .max_register = LP87565_REG_MAX,
21 };
22
23 static const struct mfd_cell lp87565_cells[] = {
24 { .name = "lp87565-q1-regulator", },
25 { .name = "lp87565-q1-gpio", },
26 };
27
28 static 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 };
44 MODULE_DEVICE_TABLE(of, of_lp87565_match_table);
45
lp87565_probe(struct i2c_client * client)46 static 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
lp87565_shutdown(struct i2c_client * client)104 static 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
111 static const struct i2c_device_id lp87565_id_table[] = {
112 { "lp87565-q1", 0 },
113 { },
114 };
115 MODULE_DEVICE_TABLE(i2c, lp87565_id_table);
116
117 static 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 };
126 module_i2c_driver(lp87565_driver);
127
128 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
129 MODULE_DESCRIPTION("lp87565 chip family Multi-Function Device driver");
130 MODULE_LICENSE("GPL v2");
131