LXR linux/drivers/mfd/tps68470.c

   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