LXR linux/drivers/platform/x86/intel/int33fe/intel_cht_int33fe

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Intel Cherry Trail ACPI INT33FE pseudo device driver for devices with
   4 * USB Micro-B connector (e.g. without of FUSB302 USB Type-C controller)
   5 *
   6 * Copyright (C) 2019 Yauhen Kharuzhy <jekhor@gmail.com>
   7 *
   8 * At least one Intel Cherry Trail based device which ship with Windows 10
   9 * (Lenovo YogaBook YB1-X91L/F tablet), have this weird INT33FE ACPI device
  10 * with a CRS table with 2 I2cSerialBusV2 resources, for 2 different chips
  11 * attached to various i2c busses:
  12 * 1. The Whiskey Cove PMIC, which is also described by the INT34D3 ACPI device
  13 * 2. TI BQ27542 Fuel Gauge Controller
  14 *
  15 * So this driver is a stub / pseudo driver whose only purpose is to
  16 * instantiate i2c-client for battery fuel gauge, so that standard i2c driver
  17 * for these chip can bind to the it.
  18 */
  19
  20#include <linux/acpi.h>
  21#include <linux/i2c.h>
  22#include <linux/module.h>
  23#include <linux/pci.h>
  24#include <linux/platform_device.h>
  25#include <linux/regulator/consumer.h>
  26#include <linux/slab.h>
  27#include <linux/usb/pd.h>
  28
  29#include "intel_cht_int33fe_common.h"
  30
  31static const char * const bq27xxx_suppliers[] = { "bq25890-charger" };
  32
  33static const struct property_entry bq27xxx_props[] = {
  34        PROPERTY_ENTRY_STRING_ARRAY("supplied-from", bq27xxx_suppliers),
  35        { }
  36};
  37
  38static const struct software_node bq27xxx_node = {
  39        .properties = bq27xxx_props,
  40};
  41
  42int cht_int33fe_microb_probe(struct cht_int33fe_data *data)
  43{
  44        struct device *dev = data->dev;
  45        struct i2c_board_info board_info;
  46
  47        memset(&board_info, 0, sizeof(board_info));
  48        strscpy(board_info.type, "bq27542", ARRAY_SIZE(board_info.type));
  49        board_info.dev_name = "bq27542";
  50        board_info.swnode = &bq27xxx_node;
  51        data->battery_fg = i2c_acpi_new_device(dev, 1, &board_info);
  52
  53        return PTR_ERR_OR_ZERO(data->battery_fg);
  54}
  55
  56int cht_int33fe_microb_remove(struct cht_int33fe_data *data)
  57{
  58        i2c_unregister_device(data->battery_fg);
  59
  60        return 0;
  61}
  62