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1 | /* |
2 | * TPS68470 chip Parent driver | |
3 | * | |
4 | * Copyright (C) 2017 Intel Corporation | |
5 | * | |
6 | * Authors: | |
7 | * Rajmohan Mani <rajmohan.mani@intel.com> | |
8 | * Tianshu Qiu <tian.shu.qiu@intel.com> | |
9 | * Jian Xu Zheng <jian.xu.zheng@intel.com> | |
10 | * Yuning Pu <yuning.pu@intel.com> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License as | |
14 | * published by the Free Software Foundation version 2. | |
15 | * | |
16 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
17 | * kind, whether express or implied; without even the implied warranty | |
18 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | */ | |
21 | ||
22 | #include <linux/acpi.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/i2c.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/mfd/core.h> | |
27 | #include <linux/mfd/tps68470.h> | |
28 | #include <linux/regmap.h> | |
29 | ||
30 | static const struct mfd_cell tps68470s[] = { | |
31 | { .name = "tps68470-gpio" }, | |
32 | { .name = "tps68470_pmic_opregion" }, | |
33 | }; | |
34 | ||
35 | static const struct regmap_config tps68470_regmap_config = { | |
36 | .reg_bits = 8, | |
37 | .val_bits = 8, | |
38 | .max_register = TPS68470_REG_MAX, | |
39 | }; | |
40 | ||
41 | static int tps68470_chip_init(struct device *dev, struct regmap *regmap) | |
42 | { | |
43 | unsigned int version; | |
44 | int ret; | |
45 | ||
46 | /* Force software reset */ | |
47 | ret = regmap_write(regmap, TPS68470_REG_RESET, TPS68470_REG_RESET_MASK); | |
48 | if (ret) | |
49 | return ret; | |
50 | ||
51 | ret = regmap_read(regmap, TPS68470_REG_REVID, &version); | |
52 | if (ret) { | |
53 | dev_err(dev, "Failed to read revision register: %d\n", ret); | |
54 | return ret; | |
55 | } | |
56 | ||
57 | dev_info(dev, "TPS68470 REVID: 0x%x\n", version); | |
58 | ||
59 | return 0; | |
60 | } | |
61 | ||
62 | static int tps68470_probe(struct i2c_client *client) | |
63 | { | |
64 | struct device *dev = &client->dev; | |
65 | struct regmap *regmap; | |
66 | int ret; | |
67 | ||
68 | regmap = devm_regmap_init_i2c(client, &tps68470_regmap_config); | |
69 | if (IS_ERR(regmap)) { | |
70 | dev_err(dev, "devm_regmap_init_i2c Error %ld\n", | |
71 | PTR_ERR(regmap)); | |
72 | return PTR_ERR(regmap); | |
73 | } | |
74 | ||
75 | i2c_set_clientdata(client, regmap); | |
76 | ||
77 | ret = tps68470_chip_init(dev, regmap); | |
78 | if (ret < 0) { | |
79 | dev_err(dev, "TPS68470 Init Error %d\n", ret); | |
80 | return ret; | |
81 | } | |
82 | ||
83 | ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, tps68470s, | |
84 | ARRAY_SIZE(tps68470s), NULL, 0, NULL); | |
85 | if (ret < 0) { | |
86 | dev_err(dev, "devm_mfd_add_devices failed: %d\n", ret); | |
87 | return ret; | |
88 | } | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static const struct acpi_device_id tps68470_acpi_ids[] = { | |
94 | {"INT3472"}, | |
95 | {}, | |
96 | }; | |
97 | MODULE_DEVICE_TABLE(acpi, tps68470_acpi_ids); | |
98 | ||
99 | static struct i2c_driver tps68470_driver = { | |
100 | .driver = { | |
101 | .name = "tps68470", | |
102 | .acpi_match_table = tps68470_acpi_ids, | |
103 | }, | |
104 | .probe_new = tps68470_probe, | |
105 | }; | |
106 | builtin_i2c_driver(tps68470_driver); |