1// SPDX-License-Identifier: GPL-2.0
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>
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
22static const struct mfd_cell tps68470s[] = {
23 { .name = "tps68470-gpio" },
24 { .name = "tps68470_pmic_opregion" },
25};
26
27static const struct regmap_config tps68470_regmap_config = {
28 .reg_bits = 8,
29 .val_bits = 8,
30 .max_register = TPS68470_REG_MAX,
31};
32
33static 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
54static 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
85static const struct acpi_device_id tps68470_acpi_ids[] = {
86 {"INT3472"},
87 {},
88};
89
90static struct i2c_driver tps68470_driver = {
91 .driver = {
92 .name = "tps68470",
93 .acpi_match_table = tps68470_acpi_ids,
94 },
95 .probe_new = tps68470_probe,
96};
97builtin_i2c_driver(tps68470_driver);
98