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