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
  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 };
  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);