| /* |
| * TPS68470 chip Parent driver |
| * |
| * Copyright (C) 2017 Intel Corporation |
| * |
| * Authors: |
| * Rajmohan Mani <rajmohan.mani@intel.com> |
| * Tianshu Qiu <tian.shu.qiu@intel.com> |
| * Jian Xu Zheng <jian.xu.zheng@intel.com> |
| * Yuning Pu <yuning.pu@intel.com> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation version 2. |
| * |
| * This program is distributed "as is" WITHOUT ANY WARRANTY of any |
| * kind, whether express or implied; without even the implied warranty |
| * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <linux/acpi.h> |
| #include <linux/delay.h> |
| #include <linux/i2c.h> |
| #include <linux/init.h> |
| #include <linux/mfd/core.h> |
| #include <linux/mfd/tps68470.h> |
| #include <linux/regmap.h> |
| |
| static const struct mfd_cell tps68470s[] = { |
| { .name = "tps68470-gpio" }, |
| { .name = "tps68470_pmic_opregion" }, |
| }; |
| |
| static const struct regmap_config tps68470_regmap_config = { |
| .reg_bits = 8, |
| .val_bits = 8, |
| .max_register = TPS68470_REG_MAX, |
| }; |
| |
| static int tps68470_chip_init(struct device *dev, struct regmap *regmap) |
| { |
| unsigned int version; |
| int ret; |
| |
| /* Force software reset */ |
| ret = regmap_write(regmap, TPS68470_REG_RESET, TPS68470_REG_RESET_MASK); |
| if (ret) |
| return ret; |
| |
| ret = regmap_read(regmap, TPS68470_REG_REVID, &version); |
| if (ret) { |
| dev_err(dev, "Failed to read revision register: %d\n", ret); |
| return ret; |
| } |
| |
| dev_info(dev, "TPS68470 REVID: 0x%x\n", version); |
| |
| return 0; |
| } |
| |
| static int tps68470_probe(struct i2c_client *client) |
| { |
| struct device *dev = &client->dev; |
| struct regmap *regmap; |
| int ret; |
| |
| regmap = devm_regmap_init_i2c(client, &tps68470_regmap_config); |
| if (IS_ERR(regmap)) { |
| dev_err(dev, "devm_regmap_init_i2c Error %ld\n", |
| PTR_ERR(regmap)); |
| return PTR_ERR(regmap); |
| } |
| |
| i2c_set_clientdata(client, regmap); |
| |
| ret = tps68470_chip_init(dev, regmap); |
| if (ret < 0) { |
| dev_err(dev, "TPS68470 Init Error %d\n", ret); |
| return ret; |
| } |
| |
| ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE, tps68470s, |
| ARRAY_SIZE(tps68470s), NULL, 0, NULL); |
| if (ret < 0) { |
| dev_err(dev, "devm_mfd_add_devices failed: %d\n", ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static const struct acpi_device_id tps68470_acpi_ids[] = { |
| {"INT3472"}, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(acpi, tps68470_acpi_ids); |
| |
| static struct i2c_driver tps68470_driver = { |
| .driver = { |
| .name = "tps68470", |
| .acpi_match_table = tps68470_acpi_ids, |
| }, |
| .probe_new = tps68470_probe, |
| }; |
| builtin_i2c_driver(tps68470_driver); |