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a10e763b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1e349600 | 2 | /* |
4f4ed454 | 3 | * Copyright (C) 2017 Texas Instruments Incorporated - https://www.ti.com/ |
1e349600 K |
4 | * |
5 | * Author: Keerthy <j-keerthy@ti.com> | |
1e349600 K |
6 | */ |
7 | ||
50e4d7a2 | 8 | #include <linux/gpio/consumer.h> |
1e349600 K |
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", }, | |
4b6ec08f LC |
30 | { |
31 | .compatible = "ti,lp87524-q1", | |
32 | .data = (void *)LP87565_DEVICE_TYPE_LP87524_Q1, | |
33 | }, | |
1e349600 K |
34 | { |
35 | .compatible = "ti,lp87565-q1", | |
36 | .data = (void *)LP87565_DEVICE_TYPE_LP87565_Q1, | |
37 | }, | |
013e868b K |
38 | { |
39 | .compatible = "ti,lp87561-q1", | |
40 | .data = (void *)LP87565_DEVICE_TYPE_LP87561_Q1, | |
41 | }, | |
1e349600 K |
42 | {} |
43 | }; | |
44 | MODULE_DEVICE_TABLE(of, of_lp87565_match_table); | |
45 | ||
46 | static int lp87565_probe(struct i2c_client *client, | |
47 | const struct i2c_device_id *ids) | |
48 | { | |
49 | struct lp87565 *lp87565; | |
50 | const struct of_device_id *of_id; | |
51 | int ret; | |
52 | unsigned int otpid; | |
53 | ||
54 | lp87565 = devm_kzalloc(&client->dev, sizeof(*lp87565), GFP_KERNEL); | |
55 | if (!lp87565) | |
56 | return -ENOMEM; | |
57 | ||
58 | lp87565->dev = &client->dev; | |
59 | ||
60 | lp87565->regmap = devm_regmap_init_i2c(client, &lp87565_regmap_config); | |
61 | if (IS_ERR(lp87565->regmap)) { | |
62 | ret = PTR_ERR(lp87565->regmap); | |
63 | dev_err(lp87565->dev, | |
64 | "Failed to initialize register map: %d\n", ret); | |
65 | return ret; | |
66 | } | |
67 | ||
50e4d7a2 LC |
68 | lp87565->reset_gpio = devm_gpiod_get_optional(lp87565->dev, "reset", |
69 | GPIOD_OUT_LOW); | |
70 | if (IS_ERR(lp87565->reset_gpio)) { | |
71 | ret = PTR_ERR(lp87565->reset_gpio); | |
72 | if (ret == -EPROBE_DEFER) | |
73 | return ret; | |
74 | } | |
75 | ||
76 | if (lp87565->reset_gpio) { | |
77 | gpiod_set_value_cansleep(lp87565->reset_gpio, 1); | |
78 | /* The minimum assertion time is undocumented, just guess */ | |
79 | usleep_range(2000, 4000); | |
80 | ||
81 | gpiod_set_value_cansleep(lp87565->reset_gpio, 0); | |
82 | /* Min 1.2 ms before first I2C transaction */ | |
83 | usleep_range(1500, 3000); | |
84 | } | |
85 | ||
1e349600 K |
86 | ret = regmap_read(lp87565->regmap, LP87565_REG_OTP_REV, &otpid); |
87 | if (ret) { | |
88 | dev_err(lp87565->dev, "Failed to read OTP ID\n"); | |
89 | return ret; | |
90 | } | |
91 | ||
92 | lp87565->rev = otpid & LP87565_OTP_REV_OTP_ID; | |
93 | ||
94 | of_id = of_match_device(of_lp87565_match_table, &client->dev); | |
95 | if (of_id) | |
96 | lp87565->dev_type = (enum lp87565_device_type)of_id->data; | |
97 | ||
98 | i2c_set_clientdata(client, lp87565); | |
99 | ||
ea3993a9 AL |
100 | return devm_mfd_add_devices(lp87565->dev, PLATFORM_DEVID_AUTO, |
101 | lp87565_cells, ARRAY_SIZE(lp87565_cells), | |
102 | NULL, 0, NULL); | |
1e349600 K |
103 | } |
104 | ||
50e4d7a2 LC |
105 | static void lp87565_shutdown(struct i2c_client *client) |
106 | { | |
107 | struct lp87565 *lp87565 = i2c_get_clientdata(client); | |
108 | ||
109 | gpiod_set_value_cansleep(lp87565->reset_gpio, 1); | |
110 | } | |
111 | ||
1e349600 K |
112 | static const struct i2c_device_id lp87565_id_table[] = { |
113 | { "lp87565-q1", 0 }, | |
114 | { }, | |
115 | }; | |
116 | MODULE_DEVICE_TABLE(i2c, lp87565_id_table); | |
117 | ||
118 | static struct i2c_driver lp87565_driver = { | |
119 | .driver = { | |
120 | .name = "lp87565", | |
121 | .of_match_table = of_lp87565_match_table, | |
122 | }, | |
123 | .probe = lp87565_probe, | |
50e4d7a2 | 124 | .shutdown = lp87565_shutdown, |
1e349600 K |
125 | .id_table = lp87565_id_table, |
126 | }; | |
127 | module_i2c_driver(lp87565_driver); | |
128 | ||
129 | MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); | |
130 | MODULE_DESCRIPTION("lp87565 chip family Multi-Function Device driver"); | |
131 | MODULE_LICENSE("GPL v2"); |