drivers/platform/x86/intel_cht_int33fe_microb.c

   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
  31 static const char * const bq27xxx_suppliers[] = { "bq25890-charger" };
  32
  33 static const struct property_entry bq27xxx_props[] = {
  34         PROPERTY_ENTRY_STRING_ARRAY("supplied-from", bq27xxx_suppliers),
  35         { }
  36 };
  37
  38 int cht_int33fe_microb_probe(struct cht_int33fe_data *data)
  39 {
  40         struct device *dev = data->dev;
  41         struct i2c_board_info board_info;
  42
  43         memset(&board_info, 0, sizeof(board_info));
  44         strscpy(board_info.type, "bq27542", ARRAY_SIZE(board_info.type));
  45         board_info.dev_name = "bq27542";
  46         board_info.properties = bq27xxx_props;
  47         data->battery_fg = i2c_acpi_new_device(dev, 1, &board_info);
  48
  49         return PTR_ERR_OR_ZERO(data->battery_fg);
  50 }
  51
  52 int cht_int33fe_microb_remove(struct cht_int33fe_data *data)
  53 {
  54         i2c_unregister_device(data->battery_fg);
  55
  56         return 0;
  57 }