| Rajmohan Mani | 9bbf6a1 | 2017-07-28 17:30:24 -0700 | [diff] [blame^] | 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); |