projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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); |