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37c089d1 | 1 | // SPDX-License-Identifier: GPL-2.0 |
9bbf6a15 RM |
2 | /* |
3 | * TPS68470 chip Parent driver | |
4 | * | |
5 | * Copyright (C) 2017 Intel Corporation | |
6 | * | |
7 | * Authors: | |
8 | * Rajmohan Mani <rajmohan.mani@intel.com> | |
9 | * Tianshu Qiu <tian.shu.qiu@intel.com> | |
10 | * Jian Xu Zheng <jian.xu.zheng@intel.com> | |
11 | * Yuning Pu <yuning.pu@intel.com> | |
9bbf6a15 RM |
12 | */ |
13 | ||
14 | #include <linux/acpi.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/i2c.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/mfd/core.h> | |
19 | #include <linux/mfd/tps68470.h> | |
20 | #include <linux/regmap.h> | |
21 | ||
22 | static const struct mfd_cell tps68470s[] = { | |
23 | { .name = "tps68470-gpio" }, | |
24 | { .name = "tps68470_pmic_opregion" }, | |
25 | }; | |
26 | ||
27 | static const struct regmap_config tps68470_regmap_config = { | |
28 | .reg_bits = 8, | |
29 | .val_bits = 8, | |
30 | .max_register = TPS68470_REG_MAX, | |
31 | }; | |
32 | ||
33 | static int tps68470_chip_init(struct device *dev, struct regmap *regmap) | |
34 | { | |
35 | unsigned int version; | |
36 | int ret; | |
37 | ||
38 | /* Force software reset */ | |
39 | ret = regmap_write(regmap, TPS68470_REG_RESET, TPS68470_REG_RESET_MASK); | |
40 | if (ret) | |
41 | return ret; | |
42 | ||
43 | ret = regmap_read(regmap, TPS68470_REG_REVID, &version); | |
44 | if (ret) { | |
45 | dev_err(dev, "Failed to read revision register: %d\n", ret); | |
46 | return ret; | |
47 | } | |
48 | ||
49 | dev_info(dev, "TPS68470 REVID: 0x%x\n", version); | |
50 | ||
51 | return 0; | |
52 | } | |
53 | ||
54 | static int tps68470_probe(struct i2c_client *client) | |
55 | { | |
56 | struct device *dev = &client->dev; | |
57 | struct regmap *regmap; | |
58 | int ret; | |
59 | ||
60 | regmap = devm_regmap_init_i2c(client, &tps68470_regmap_config); | |
61 | if (IS_ERR(regmap)) { | |
62 | dev_err(dev, "devm_regmap_init_i2c Error %ld\n", | |
63 | PTR_ERR(regmap)); | |
64 | return PTR_ERR(regmap); | |
65 | } | |
66 | ||
67 | i2c_set_clientdata(client, regmap); | |
68 | ||
69 | ret = tps68470_chip_init(dev, regmap); | |
70 | if (ret < 0) { | |
71 | dev_err(dev, "TPS68470 Init Error %d\n", ret); | |
72 | return ret; | |
73 | } | |
74 | ||
75 | ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, tps68470s, | |
76 | ARRAY_SIZE(tps68470s), NULL, 0, NULL); | |
77 | if (ret < 0) { | |
78 | dev_err(dev, "devm_mfd_add_devices failed: %d\n", ret); | |
79 | return ret; | |
80 | } | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
85 | static const struct acpi_device_id tps68470_acpi_ids[] = { | |
86 | {"INT3472"}, | |
87 | {}, | |
88 | }; | |
9bbf6a15 RM |
89 | |
90 | static struct i2c_driver tps68470_driver = { | |
91 | .driver = { | |
92 | .name = "tps68470", | |
93 | .acpi_match_table = tps68470_acpi_ids, | |
94 | }, | |
95 | .probe_new = tps68470_probe, | |
96 | }; | |
97 | builtin_i2c_driver(tps68470_driver); |