246 lines
7.4 KiB
C
246 lines
7.4 KiB
C
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/*
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* Intel Cherry Trail ACPI INT33FE pseudo device driver
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*
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* Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Some Intel Cherry Trail based device which ship with Windows 10, have
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* this weird INT33FE ACPI device with a CRS table with 4 I2cSerialBusV2
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* resources, for 4 different chips attached to various i2c busses:
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* 1. The Whiskey Cove pmic, which is also described by the INT34D3 ACPI device
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* 2. Maxim MAX17047 Fuel Gauge Controller
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* 3. FUSB302 USB Type-C Controller
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* 4. PI3USB30532 USB switch
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*
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* So this driver is a stub / pseudo driver whose only purpose is to
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* instantiate i2c-clients for chips 2 - 4, so that standard i2c drivers
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* for these chips can bind to the them.
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*/
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#include <linux/acpi.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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#define EXPECTED_PTYPE 4
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struct cht_int33fe_data {
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struct i2c_client *max17047;
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struct i2c_client *fusb302;
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struct i2c_client *pi3usb30532;
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};
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/*
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* Grrr I severly dislike buggy BIOS-es. At least one BIOS enumerates
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* the max17047 both through the INT33FE ACPI device (it is right there
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* in the resources table) as well as through a separate MAX17047 device.
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*
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* These helpers are used to work around this by checking if an i2c-client
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* for the max17047 has already been registered.
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*/
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static int cht_int33fe_check_for_max17047(struct device *dev, void *data)
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{
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struct i2c_client **max17047 = data;
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struct acpi_device *adev;
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const char *hid;
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adev = ACPI_COMPANION(dev);
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if (!adev)
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return 0;
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hid = acpi_device_hid(adev);
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/* The MAX17047 ACPI node doesn't have an UID, so we don't check that */
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if (strcmp(hid, "MAX17047"))
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return 0;
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*max17047 = to_i2c_client(dev);
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return 1;
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}
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static struct i2c_client *cht_int33fe_find_max17047(void)
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{
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struct i2c_client *max17047 = NULL;
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i2c_for_each_dev(&max17047, cht_int33fe_check_for_max17047);
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return max17047;
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}
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static const char * const max17047_suppliers[] = { "bq24190-charger" };
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static const struct property_entry max17047_props[] = {
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PROPERTY_ENTRY_STRING_ARRAY("supplied-from", max17047_suppliers),
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{ }
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};
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static const struct property_entry fusb302_props[] = {
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PROPERTY_ENTRY_STRING("fcs,extcon-name", "cht_wcove_pwrsrc"),
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PROPERTY_ENTRY_U32("fcs,max-sink-microvolt", 12000000),
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PROPERTY_ENTRY_U32("fcs,max-sink-microamp", 3000000),
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PROPERTY_ENTRY_U32("fcs,max-sink-microwatt", 36000000),
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{ }
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};
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static int cht_int33fe_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct i2c_board_info board_info;
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struct cht_int33fe_data *data;
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struct i2c_client *max17047;
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struct regulator *regulator;
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unsigned long long ptyp;
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acpi_status status;
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int fusb302_irq;
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int ret;
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status = acpi_evaluate_integer(ACPI_HANDLE(dev), "PTYP", NULL, &ptyp);
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if (ACPI_FAILURE(status)) {
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dev_err(dev, "Error getting PTYPE\n");
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return -ENODEV;
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}
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/*
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* The same ACPI HID is used for different configurations check PTYP
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* to ensure that we are dealing with the expected config.
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*/
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if (ptyp != EXPECTED_PTYPE)
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return -ENODEV;
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/* Check presence of INT34D3 (hardware-rev 3) expected for ptype == 4 */
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if (!acpi_dev_present("INT34D3", "1", 3)) {
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dev_err(dev, "Error PTYPE == %d, but no INT34D3 device\n",
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EXPECTED_PTYPE);
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return -ENODEV;
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}
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/*
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* We expect the WC PMIC to be paired with a TI bq24292i charger-IC.
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* We check for the bq24292i vbus regulator here, this has 2 purposes:
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* 1) The bq24292i allows charging with up to 12V, setting the fusb302's
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* max-snk voltage to 12V with another charger-IC is not good.
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* 2) For the fusb302 driver to get the bq24292i vbus regulator, the
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* regulator-map, which is part of the bq24292i regulator_init_data,
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* must be registered before the fusb302 is instantiated, otherwise
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* it will end up with a dummy-regulator.
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* Note "cht_wc_usb_typec_vbus" comes from the regulator_init_data
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* which is defined in i2c-cht-wc.c from where the bq24292i i2c-client
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* gets instantiated. We use regulator_get_optional here so that we
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* don't end up getting a dummy-regulator ourselves.
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*/
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regulator = regulator_get_optional(dev, "cht_wc_usb_typec_vbus");
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if (IS_ERR(regulator)) {
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ret = PTR_ERR(regulator);
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return (ret == -ENODEV) ? -EPROBE_DEFER : ret;
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}
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regulator_put(regulator);
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/* The FUSB302 uses the irq at index 1 and is the only irq user */
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fusb302_irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 1);
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if (fusb302_irq < 0) {
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if (fusb302_irq != -EPROBE_DEFER)
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dev_err(dev, "Error getting FUSB302 irq\n");
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return fusb302_irq;
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}
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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/* Work around BIOS bug, see comment on cht_int33fe_find_max17047 */
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max17047 = cht_int33fe_find_max17047();
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if (max17047) {
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/* Pre-existing i2c-client for the max17047, add device-props */
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ret = device_add_properties(&max17047->dev, max17047_props);
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if (ret)
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return ret;
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/* And re-probe to get the new device-props applied. */
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ret = device_reprobe(&max17047->dev);
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if (ret)
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dev_warn(dev, "Reprobing max17047 error: %d\n", ret);
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} else {
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memset(&board_info, 0, sizeof(board_info));
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strlcpy(board_info.type, "max17047", I2C_NAME_SIZE);
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board_info.dev_name = "max17047";
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board_info.properties = max17047_props;
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data->max17047 = i2c_acpi_new_device(dev, 1, &board_info);
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if (!data->max17047)
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return -EPROBE_DEFER; /* Wait for i2c-adapter to load */
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}
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memset(&board_info, 0, sizeof(board_info));
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strlcpy(board_info.type, "typec_fusb302", I2C_NAME_SIZE);
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board_info.dev_name = "fusb302";
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board_info.properties = fusb302_props;
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board_info.irq = fusb302_irq;
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data->fusb302 = i2c_acpi_new_device(dev, 2, &board_info);
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if (!data->fusb302)
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goto out_unregister_max17047;
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memset(&board_info, 0, sizeof(board_info));
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board_info.dev_name = "pi3usb30532";
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strlcpy(board_info.type, "pi3usb30532", I2C_NAME_SIZE);
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data->pi3usb30532 = i2c_acpi_new_device(dev, 3, &board_info);
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if (!data->pi3usb30532)
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goto out_unregister_fusb302;
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i2c_set_clientdata(client, data);
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return 0;
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out_unregister_fusb302:
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i2c_unregister_device(data->fusb302);
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out_unregister_max17047:
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if (data->max17047)
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i2c_unregister_device(data->max17047);
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return -EPROBE_DEFER; /* Wait for the i2c-adapter to load */
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}
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static int cht_int33fe_remove(struct i2c_client *i2c)
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{
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struct cht_int33fe_data *data = i2c_get_clientdata(i2c);
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i2c_unregister_device(data->pi3usb30532);
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i2c_unregister_device(data->fusb302);
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if (data->max17047)
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i2c_unregister_device(data->max17047);
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return 0;
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}
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static const struct i2c_device_id cht_int33fe_i2c_id[] = {
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, cht_int33fe_i2c_id);
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static const struct acpi_device_id cht_int33fe_acpi_ids[] = {
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{ "INT33FE", },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, cht_int33fe_acpi_ids);
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static struct i2c_driver cht_int33fe_driver = {
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.driver = {
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.name = "Intel Cherry Trail ACPI INT33FE driver",
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.acpi_match_table = ACPI_PTR(cht_int33fe_acpi_ids),
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},
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.probe_new = cht_int33fe_probe,
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.remove = cht_int33fe_remove,
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.id_table = cht_int33fe_i2c_id,
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.disable_i2c_core_irq_mapping = true,
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};
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module_i2c_driver(cht_int33fe_driver);
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MODULE_DESCRIPTION("Intel Cherry Trail ACPI INT33FE pseudo device driver");
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MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
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MODULE_LICENSE("GPL");
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