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![Hans de Goede](/assets/img/avatar_default.png)
Commit21653a4181
("i2c: core: Call i2c_acpi_install_space_handler() before i2c_acpi_register_devices()")'s intention was to only move the acpi_install_address_space_handler() call to the point before where the ACPI declared i2c-children of the adapter where instantiated by i2c_acpi_register_devices(). But i2c_acpi_install_space_handler() had a call to acpi_walk_dep_device_list() hidden (that is I missed it) at the end of it, so as an unwanted side-effect now acpi_walk_dep_device_list() was also being called before i2c_acpi_register_devices(). Move the acpi_walk_dep_device_list() call to the end of i2c_acpi_register_devices(), so that it is once again called *after* the i2c_client-s hanging of the adapter have been created. This fixes the Microsoft Surface Go 2 hanging at boot. Fixes:21653a4181
("i2c: core: Call i2c_acpi_install_space_handler() before i2c_acpi_register_devices()") Link: https://bugzilla.kernel.org/show_bug.cgi?id=209627 Reported-by: Rainer Finke <rainer@finke.cc> Reported-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Suggested-by: Maximilian Luz <luzmaximilian@gmail.com> Tested-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
759 lines
18 KiB
C
759 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Linux I2C core ACPI support code
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*
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* Copyright (C) 2014 Intel Corp, Author: Lan Tianyu <tianyu.lan@intel.com>
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*/
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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include "i2c-core.h"
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struct i2c_acpi_handler_data {
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struct acpi_connection_info info;
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struct i2c_adapter *adapter;
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};
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struct gsb_buffer {
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u8 status;
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u8 len;
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union {
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u16 wdata;
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u8 bdata;
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u8 data[0];
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};
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} __packed;
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struct i2c_acpi_lookup {
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struct i2c_board_info *info;
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acpi_handle adapter_handle;
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acpi_handle device_handle;
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acpi_handle search_handle;
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int n;
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int index;
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u32 speed;
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u32 min_speed;
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u32 force_speed;
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};
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/**
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* i2c_acpi_get_i2c_resource - Gets I2cSerialBus resource if type matches
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* @ares: ACPI resource
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* @i2c: Pointer to I2cSerialBus resource will be returned here
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*
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* Checks if the given ACPI resource is of type I2cSerialBus.
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* In this case, returns a pointer to it to the caller.
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*
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* Returns true if resource type is of I2cSerialBus, otherwise false.
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*/
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bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares,
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struct acpi_resource_i2c_serialbus **i2c)
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{
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struct acpi_resource_i2c_serialbus *sb;
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if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
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return false;
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sb = &ares->data.i2c_serial_bus;
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if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C)
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return false;
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*i2c = sb;
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return true;
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}
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EXPORT_SYMBOL_GPL(i2c_acpi_get_i2c_resource);
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static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data)
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{
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struct i2c_acpi_lookup *lookup = data;
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struct i2c_board_info *info = lookup->info;
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struct acpi_resource_i2c_serialbus *sb;
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acpi_status status;
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if (info->addr || !i2c_acpi_get_i2c_resource(ares, &sb))
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return 1;
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if (lookup->index != -1 && lookup->n++ != lookup->index)
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return 1;
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status = acpi_get_handle(lookup->device_handle,
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sb->resource_source.string_ptr,
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&lookup->adapter_handle);
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if (ACPI_FAILURE(status))
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return 1;
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info->addr = sb->slave_address;
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lookup->speed = sb->connection_speed;
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if (sb->access_mode == ACPI_I2C_10BIT_MODE)
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info->flags |= I2C_CLIENT_TEN;
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return 1;
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}
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static const struct acpi_device_id i2c_acpi_ignored_device_ids[] = {
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/*
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* ACPI video acpi_devices, which are handled by the acpi-video driver
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* sometimes contain a SERIAL_TYPE_I2C ACPI resource, ignore these.
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*/
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{ ACPI_VIDEO_HID, 0 },
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{}
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};
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static int i2c_acpi_do_lookup(struct acpi_device *adev,
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struct i2c_acpi_lookup *lookup)
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{
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struct i2c_board_info *info = lookup->info;
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struct list_head resource_list;
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int ret;
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if (acpi_bus_get_status(adev) || !adev->status.present)
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return -EINVAL;
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if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0)
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return -ENODEV;
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memset(info, 0, sizeof(*info));
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lookup->device_handle = acpi_device_handle(adev);
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/* Look up for I2cSerialBus resource */
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INIT_LIST_HEAD(&resource_list);
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ret = acpi_dev_get_resources(adev, &resource_list,
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i2c_acpi_fill_info, lookup);
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acpi_dev_free_resource_list(&resource_list);
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if (ret < 0 || !info->addr)
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return -EINVAL;
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return 0;
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}
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static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data)
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{
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int *irq = data;
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struct resource r;
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if (*irq <= 0 && acpi_dev_resource_interrupt(ares, 0, &r))
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*irq = i2c_dev_irq_from_resources(&r, 1);
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return 1; /* No need to add resource to the list */
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}
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/**
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* i2c_acpi_get_irq - get device IRQ number from ACPI
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* @client: Pointer to the I2C client device
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*
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* Find the IRQ number used by a specific client device.
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*
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* Return: The IRQ number or an error code.
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*/
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int i2c_acpi_get_irq(struct i2c_client *client)
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{
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struct acpi_device *adev = ACPI_COMPANION(&client->dev);
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struct list_head resource_list;
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int irq = -ENOENT;
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int ret;
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INIT_LIST_HEAD(&resource_list);
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ret = acpi_dev_get_resources(adev, &resource_list,
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i2c_acpi_add_resource, &irq);
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if (ret < 0)
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return ret;
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acpi_dev_free_resource_list(&resource_list);
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if (irq == -ENOENT)
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irq = acpi_dev_gpio_irq_get(adev, 0);
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return irq;
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}
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static int i2c_acpi_get_info(struct acpi_device *adev,
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struct i2c_board_info *info,
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struct i2c_adapter *adapter,
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acpi_handle *adapter_handle)
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{
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struct i2c_acpi_lookup lookup;
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int ret;
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memset(&lookup, 0, sizeof(lookup));
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lookup.info = info;
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lookup.index = -1;
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if (acpi_device_enumerated(adev))
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return -EINVAL;
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ret = i2c_acpi_do_lookup(adev, &lookup);
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if (ret)
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return ret;
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if (adapter) {
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/* The adapter must match the one in I2cSerialBus() connector */
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if (ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle)
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return -ENODEV;
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} else {
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struct acpi_device *adapter_adev;
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/* The adapter must be present */
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if (acpi_bus_get_device(lookup.adapter_handle, &adapter_adev))
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return -ENODEV;
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if (acpi_bus_get_status(adapter_adev) ||
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!adapter_adev->status.present)
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return -ENODEV;
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}
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info->fwnode = acpi_fwnode_handle(adev);
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if (adapter_handle)
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*adapter_handle = lookup.adapter_handle;
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acpi_set_modalias(adev, dev_name(&adev->dev), info->type,
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sizeof(info->type));
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return 0;
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}
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static void i2c_acpi_register_device(struct i2c_adapter *adapter,
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struct acpi_device *adev,
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struct i2c_board_info *info)
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{
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adev->power.flags.ignore_parent = true;
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acpi_device_set_enumerated(adev);
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if (IS_ERR(i2c_new_client_device(adapter, info))) {
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adev->power.flags.ignore_parent = false;
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dev_err(&adapter->dev,
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"failed to add I2C device %s from ACPI\n",
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dev_name(&adev->dev));
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}
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}
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static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level,
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void *data, void **return_value)
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{
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struct i2c_adapter *adapter = data;
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struct acpi_device *adev;
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struct i2c_board_info info;
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if (acpi_bus_get_device(handle, &adev))
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return AE_OK;
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if (i2c_acpi_get_info(adev, &info, adapter, NULL))
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return AE_OK;
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i2c_acpi_register_device(adapter, adev, &info);
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return AE_OK;
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}
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#define I2C_ACPI_MAX_SCAN_DEPTH 32
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/**
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* i2c_acpi_register_devices - enumerate I2C slave devices behind adapter
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* @adap: pointer to adapter
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*
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* Enumerate all I2C slave devices behind this adapter by walking the ACPI
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* namespace. When a device is found it will be added to the Linux device
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* model and bound to the corresponding ACPI handle.
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*/
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void i2c_acpi_register_devices(struct i2c_adapter *adap)
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{
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acpi_status status;
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acpi_handle handle;
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if (!has_acpi_companion(&adap->dev))
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return;
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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I2C_ACPI_MAX_SCAN_DEPTH,
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i2c_acpi_add_device, NULL,
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adap, NULL);
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if (ACPI_FAILURE(status))
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dev_warn(&adap->dev, "failed to enumerate I2C slaves\n");
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if (!adap->dev.parent)
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return;
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handle = ACPI_HANDLE(adap->dev.parent);
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if (!handle)
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return;
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acpi_walk_dep_device_list(handle);
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}
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static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = {
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/*
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* These Silead touchscreen controllers only work at 400KHz, for
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* some reason they do not work at 100KHz. On some devices the ACPI
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* tables list another device at their bus as only being capable
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* of 100KHz, testing has shown that these other devices work fine
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* at 400KHz (as can be expected of any recent i2c hw) so we force
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* the speed of the bus to 400 KHz if a Silead device is present.
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*/
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{ "MSSL1680", 0 },
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{}
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};
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static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level,
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void *data, void **return_value)
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{
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struct i2c_acpi_lookup *lookup = data;
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struct acpi_device *adev;
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if (acpi_bus_get_device(handle, &adev))
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return AE_OK;
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if (i2c_acpi_do_lookup(adev, lookup))
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return AE_OK;
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if (lookup->search_handle != lookup->adapter_handle)
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return AE_OK;
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if (lookup->speed <= lookup->min_speed)
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lookup->min_speed = lookup->speed;
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if (acpi_match_device_ids(adev, i2c_acpi_force_400khz_device_ids) == 0)
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lookup->force_speed = I2C_MAX_FAST_MODE_FREQ;
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return AE_OK;
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}
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/**
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* i2c_acpi_find_bus_speed - find I2C bus speed from ACPI
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* @dev: The device owning the bus
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*
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* Find the I2C bus speed by walking the ACPI namespace for all I2C slaves
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* devices connected to this bus and use the speed of slowest device.
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*
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* Returns the speed in Hz or zero
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*/
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u32 i2c_acpi_find_bus_speed(struct device *dev)
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{
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struct i2c_acpi_lookup lookup;
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struct i2c_board_info dummy;
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acpi_status status;
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if (!has_acpi_companion(dev))
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return 0;
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memset(&lookup, 0, sizeof(lookup));
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lookup.search_handle = ACPI_HANDLE(dev);
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lookup.min_speed = UINT_MAX;
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lookup.info = &dummy;
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lookup.index = -1;
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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I2C_ACPI_MAX_SCAN_DEPTH,
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i2c_acpi_lookup_speed, NULL,
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&lookup, NULL);
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if (ACPI_FAILURE(status)) {
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dev_warn(dev, "unable to find I2C bus speed from ACPI\n");
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return 0;
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}
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if (lookup.force_speed) {
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if (lookup.force_speed != lookup.min_speed)
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dev_warn(dev, FW_BUG "DSDT uses known not-working I2C bus speed %d, forcing it to %d\n",
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lookup.min_speed, lookup.force_speed);
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return lookup.force_speed;
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} else if (lookup.min_speed != UINT_MAX) {
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return lookup.min_speed;
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} else {
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return 0;
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}
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}
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EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed);
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static int i2c_acpi_find_match_adapter(struct device *dev, const void *data)
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{
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struct i2c_adapter *adapter = i2c_verify_adapter(dev);
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if (!adapter)
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return 0;
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return ACPI_HANDLE(dev) == (acpi_handle)data;
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}
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struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
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{
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struct device *dev;
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dev = bus_find_device(&i2c_bus_type, NULL, handle,
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i2c_acpi_find_match_adapter);
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return dev ? i2c_verify_adapter(dev) : NULL;
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}
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EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle);
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static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev)
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{
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struct device *dev;
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struct i2c_client *client;
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dev = bus_find_device_by_acpi_dev(&i2c_bus_type, adev);
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if (!dev)
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return NULL;
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client = i2c_verify_client(dev);
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if (!client)
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put_device(dev);
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return client;
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}
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static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value,
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void *arg)
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{
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struct acpi_device *adev = arg;
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struct i2c_board_info info;
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acpi_handle adapter_handle;
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struct i2c_adapter *adapter;
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struct i2c_client *client;
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switch (value) {
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case ACPI_RECONFIG_DEVICE_ADD:
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if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle))
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break;
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adapter = i2c_acpi_find_adapter_by_handle(adapter_handle);
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if (!adapter)
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break;
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i2c_acpi_register_device(adapter, adev, &info);
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break;
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case ACPI_RECONFIG_DEVICE_REMOVE:
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if (!acpi_device_enumerated(adev))
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break;
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client = i2c_acpi_find_client_by_adev(adev);
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if (!client)
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break;
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i2c_unregister_device(client);
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put_device(&client->dev);
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break;
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}
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return NOTIFY_OK;
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}
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struct notifier_block i2c_acpi_notifier = {
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.notifier_call = i2c_acpi_notify,
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};
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/**
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* i2c_acpi_new_device - Create i2c-client for the Nth I2cSerialBus resource
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* @dev: Device owning the ACPI resources to get the client from
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* @index: Index of ACPI resource to get
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* @info: describes the I2C device; note this is modified (addr gets set)
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* Context: can sleep
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*
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* By default the i2c subsys creates an i2c-client for the first I2cSerialBus
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* resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus
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* resources, in that case this function can be used to create an i2c-client
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* for other I2cSerialBus resources in the Current Resource Settings table.
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*
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* Also see i2c_new_client_device, which this function calls to create the
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* i2c-client.
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*
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* Returns a pointer to the new i2c-client, or error pointer in case of failure.
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* Specifically, -EPROBE_DEFER is returned if the adapter is not found.
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*/
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struct i2c_client *i2c_acpi_new_device(struct device *dev, int index,
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struct i2c_board_info *info)
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{
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struct acpi_device *adev = ACPI_COMPANION(dev);
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struct i2c_acpi_lookup lookup;
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struct i2c_adapter *adapter;
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LIST_HEAD(resource_list);
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int ret;
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memset(&lookup, 0, sizeof(lookup));
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lookup.info = info;
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lookup.device_handle = acpi_device_handle(adev);
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lookup.index = index;
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ret = acpi_dev_get_resources(adev, &resource_list,
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i2c_acpi_fill_info, &lookup);
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|
if (ret < 0)
|
|
return ERR_PTR(ret);
|
|
|
|
acpi_dev_free_resource_list(&resource_list);
|
|
|
|
if (!info->addr)
|
|
return ERR_PTR(-EADDRNOTAVAIL);
|
|
|
|
adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle);
|
|
if (!adapter)
|
|
return ERR_PTR(-EPROBE_DEFER);
|
|
|
|
return i2c_new_client_device(adapter, info);
|
|
}
|
|
EXPORT_SYMBOL_GPL(i2c_acpi_new_device);
|
|
|
|
#ifdef CONFIG_ACPI_I2C_OPREGION
|
|
static int acpi_gsb_i2c_read_bytes(struct i2c_client *client,
|
|
u8 cmd, u8 *data, u8 data_len)
|
|
{
|
|
|
|
struct i2c_msg msgs[2];
|
|
int ret;
|
|
u8 *buffer;
|
|
|
|
buffer = kzalloc(data_len, GFP_KERNEL);
|
|
if (!buffer)
|
|
return AE_NO_MEMORY;
|
|
|
|
msgs[0].addr = client->addr;
|
|
msgs[0].flags = client->flags;
|
|
msgs[0].len = 1;
|
|
msgs[0].buf = &cmd;
|
|
|
|
msgs[1].addr = client->addr;
|
|
msgs[1].flags = client->flags | I2C_M_RD;
|
|
msgs[1].len = data_len;
|
|
msgs[1].buf = buffer;
|
|
|
|
ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
|
|
if (ret < 0) {
|
|
/* Getting a NACK is unfortunately normal with some DSTDs */
|
|
if (ret == -EREMOTEIO)
|
|
dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n",
|
|
data_len, client->addr, cmd, ret);
|
|
else
|
|
dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n",
|
|
data_len, client->addr, cmd, ret);
|
|
/* 2 transfers must have completed successfully */
|
|
} else if (ret == 2) {
|
|
memcpy(data, buffer, data_len);
|
|
ret = 0;
|
|
} else {
|
|
ret = -EIO;
|
|
}
|
|
|
|
kfree(buffer);
|
|
return ret;
|
|
}
|
|
|
|
static int acpi_gsb_i2c_write_bytes(struct i2c_client *client,
|
|
u8 cmd, u8 *data, u8 data_len)
|
|
{
|
|
|
|
struct i2c_msg msgs[1];
|
|
u8 *buffer;
|
|
int ret = AE_OK;
|
|
|
|
buffer = kzalloc(data_len + 1, GFP_KERNEL);
|
|
if (!buffer)
|
|
return AE_NO_MEMORY;
|
|
|
|
buffer[0] = cmd;
|
|
memcpy(buffer + 1, data, data_len);
|
|
|
|
msgs[0].addr = client->addr;
|
|
msgs[0].flags = client->flags;
|
|
msgs[0].len = data_len + 1;
|
|
msgs[0].buf = buffer;
|
|
|
|
ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
|
|
|
|
kfree(buffer);
|
|
|
|
if (ret < 0) {
|
|
dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* 1 transfer must have completed successfully */
|
|
return (ret == 1) ? 0 : -EIO;
|
|
}
|
|
|
|
static acpi_status
|
|
i2c_acpi_space_handler(u32 function, acpi_physical_address command,
|
|
u32 bits, u64 *value64,
|
|
void *handler_context, void *region_context)
|
|
{
|
|
struct gsb_buffer *gsb = (struct gsb_buffer *)value64;
|
|
struct i2c_acpi_handler_data *data = handler_context;
|
|
struct acpi_connection_info *info = &data->info;
|
|
struct acpi_resource_i2c_serialbus *sb;
|
|
struct i2c_adapter *adapter = data->adapter;
|
|
struct i2c_client *client;
|
|
struct acpi_resource *ares;
|
|
u32 accessor_type = function >> 16;
|
|
u8 action = function & ACPI_IO_MASK;
|
|
acpi_status ret;
|
|
int status;
|
|
|
|
ret = acpi_buffer_to_resource(info->connection, info->length, &ares);
|
|
if (ACPI_FAILURE(ret))
|
|
return ret;
|
|
|
|
client = kzalloc(sizeof(*client), GFP_KERNEL);
|
|
if (!client) {
|
|
ret = AE_NO_MEMORY;
|
|
goto err;
|
|
}
|
|
|
|
if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) {
|
|
ret = AE_BAD_PARAMETER;
|
|
goto err;
|
|
}
|
|
|
|
client->adapter = adapter;
|
|
client->addr = sb->slave_address;
|
|
|
|
if (sb->access_mode == ACPI_I2C_10BIT_MODE)
|
|
client->flags |= I2C_CLIENT_TEN;
|
|
|
|
switch (accessor_type) {
|
|
case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV:
|
|
if (action == ACPI_READ) {
|
|
status = i2c_smbus_read_byte(client);
|
|
if (status >= 0) {
|
|
gsb->bdata = status;
|
|
status = 0;
|
|
}
|
|
} else {
|
|
status = i2c_smbus_write_byte(client, gsb->bdata);
|
|
}
|
|
break;
|
|
|
|
case ACPI_GSB_ACCESS_ATTRIB_BYTE:
|
|
if (action == ACPI_READ) {
|
|
status = i2c_smbus_read_byte_data(client, command);
|
|
if (status >= 0) {
|
|
gsb->bdata = status;
|
|
status = 0;
|
|
}
|
|
} else {
|
|
status = i2c_smbus_write_byte_data(client, command,
|
|
gsb->bdata);
|
|
}
|
|
break;
|
|
|
|
case ACPI_GSB_ACCESS_ATTRIB_WORD:
|
|
if (action == ACPI_READ) {
|
|
status = i2c_smbus_read_word_data(client, command);
|
|
if (status >= 0) {
|
|
gsb->wdata = status;
|
|
status = 0;
|
|
}
|
|
} else {
|
|
status = i2c_smbus_write_word_data(client, command,
|
|
gsb->wdata);
|
|
}
|
|
break;
|
|
|
|
case ACPI_GSB_ACCESS_ATTRIB_BLOCK:
|
|
if (action == ACPI_READ) {
|
|
status = i2c_smbus_read_block_data(client, command,
|
|
gsb->data);
|
|
if (status >= 0) {
|
|
gsb->len = status;
|
|
status = 0;
|
|
}
|
|
} else {
|
|
status = i2c_smbus_write_block_data(client, command,
|
|
gsb->len, gsb->data);
|
|
}
|
|
break;
|
|
|
|
case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE:
|
|
if (action == ACPI_READ) {
|
|
status = acpi_gsb_i2c_read_bytes(client, command,
|
|
gsb->data, info->access_length);
|
|
} else {
|
|
status = acpi_gsb_i2c_write_bytes(client, command,
|
|
gsb->data, info->access_length);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n",
|
|
accessor_type, client->addr);
|
|
ret = AE_BAD_PARAMETER;
|
|
goto err;
|
|
}
|
|
|
|
gsb->status = status;
|
|
|
|
err:
|
|
kfree(client);
|
|
ACPI_FREE(ares);
|
|
return ret;
|
|
}
|
|
|
|
|
|
int i2c_acpi_install_space_handler(struct i2c_adapter *adapter)
|
|
{
|
|
acpi_handle handle;
|
|
struct i2c_acpi_handler_data *data;
|
|
acpi_status status;
|
|
|
|
if (!adapter->dev.parent)
|
|
return -ENODEV;
|
|
|
|
handle = ACPI_HANDLE(adapter->dev.parent);
|
|
|
|
if (!handle)
|
|
return -ENODEV;
|
|
|
|
data = kzalloc(sizeof(struct i2c_acpi_handler_data),
|
|
GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
data->adapter = adapter;
|
|
status = acpi_bus_attach_private_data(handle, (void *)data);
|
|
if (ACPI_FAILURE(status)) {
|
|
kfree(data);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
status = acpi_install_address_space_handler(handle,
|
|
ACPI_ADR_SPACE_GSBUS,
|
|
&i2c_acpi_space_handler,
|
|
NULL,
|
|
data);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_err(&adapter->dev, "Error installing i2c space handler\n");
|
|
acpi_bus_detach_private_data(handle);
|
|
kfree(data);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter)
|
|
{
|
|
acpi_handle handle;
|
|
struct i2c_acpi_handler_data *data;
|
|
acpi_status status;
|
|
|
|
if (!adapter->dev.parent)
|
|
return;
|
|
|
|
handle = ACPI_HANDLE(adapter->dev.parent);
|
|
|
|
if (!handle)
|
|
return;
|
|
|
|
acpi_remove_address_space_handler(handle,
|
|
ACPI_ADR_SPACE_GSBUS,
|
|
&i2c_acpi_space_handler);
|
|
|
|
status = acpi_bus_get_private_data(handle, (void **)&data);
|
|
if (ACPI_SUCCESS(status))
|
|
kfree(data);
|
|
|
|
acpi_bus_detach_private_data(handle);
|
|
}
|
|
#endif /* CONFIG_ACPI_I2C_OPREGION */
|