mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
|
/*
|
||
|
|
* ACPI I2C enumeration support
|
||
|
|
*
|
||
|
|
* Copyright (C) 2012, Intel Corporation
|
||
|
|
* Author: Mika Westerberg <mika.westerberg@linux.intel.com>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/acpi.h>
|
||
|
|
#include <linux/device.h>
|
||
|
|
#include <linux/export.h>
|
||
|
|
#include <linux/i2c.h>
|
||
|
|
#include <linux/ioport.h>
|
||
|
|
|
||
|
|
ACPI_MODULE_NAME("i2c");
|
||
|
|
|
||
|
|
static int acpi_i2c_add_resource(struct acpi_resource *ares, void *data)
|
||
|
|
{
|
||
|
|
struct i2c_board_info *info = data;
|
||
|
|
|
||
|
|
if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
|
||
|
|
struct acpi_resource_i2c_serialbus *sb;
|
||
|
|
|
||
|
|
sb = &ares->data.i2c_serial_bus;
|
||
|
|
if (sb->type == ACPI_RESOURCE_SERIAL_TYPE_I2C) {
|
||
|
|
info->addr = sb->slave_address;
|
||
|
|
if (sb->access_mode == ACPI_I2C_10BIT_MODE)
|
||
|
|
info->flags |= I2C_CLIENT_TEN;
|
||
|
|
}
|
||
|
|
} else if (info->irq < 0) {
|
||
|
|
struct resource r;
|
||
|
|
|
||
|
|
if (acpi_dev_resource_interrupt(ares, 0, &r))
|
||
|
|
info->irq = r.start;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Tell the ACPI core to skip this resource */
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level,
|
||
|
|
void *data, void **return_value)
|
||
|
|
{
|
||
|
|
struct i2c_adapter *adapter = data;
|
||
|
|
struct list_head resource_list;
|
||
|
|
struct i2c_board_info info;
|
||
|
|
struct acpi_device *adev;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (acpi_bus_get_device(handle, &adev))
|
||
|
|
return AE_OK;
|
||
|
|
if (acpi_bus_get_status(adev) || !adev->status.present)
|
||
|
|
return AE_OK;
|
||
|
|
|
||
|
|
memset(&info, 0, sizeof(info));
|
||
|
|
info.acpi_node.handle = handle;
|
||
|
|
info.irq = -1;
|
||
|
|
|
||
|
|
INIT_LIST_HEAD(&resource_list);
|
||
|
|
ret = acpi_dev_get_resources(adev, &resource_list,
|
||
|
|
acpi_i2c_add_resource, &info);
|
||
|
|
acpi_dev_free_resource_list(&resource_list);
|
||
|
|
|
||
|
|
if (ret < 0 || !info.addr)
|
||
|
|
return AE_OK;
|
||
|
|
|
||
|
|
strlcpy(info.type, dev_name(&adev->dev), sizeof(info.type));
|
||
|
|
if (!i2c_new_device(adapter, &info)) {
|
||
|
|
dev_err(&adapter->dev,
|
||
|
|
"failed to add I2C device %s from ACPI\n",
|
||
|
|
dev_name(&adev->dev));
|
||
|
|
}
|
||
|
|
|
||
|
|
return AE_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* acpi_i2c_register_devices - enumerate I2C slave devices behind adapter
|
||
|
|
* @adapter: pointer to adapter
|
||
|
|
*
|
||
|
|
* Enumerate all I2C slave devices behind this adapter by walking the ACPI
|
||
|
|
* namespace. When a device is found it will be added to the Linux device
|
||
|
|
* model and bound to the corresponding ACPI handle.
|
||
|
|
*/
|
||
|
|
void acpi_i2c_register_devices(struct i2c_adapter *adapter)
|
||
|
|
{
|
||
|
|
acpi_handle handle;
|
||
|
|
acpi_status status;
|
||
|
|
|
||
|
|
handle = ACPI_HANDLE(&adapter->dev);
|
||
|
|
if (!handle)
|
||
|
|
return;
|
||
|
|
|
||
|
|
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
|
||
|
|
acpi_i2c_add_device, NULL,
|
||
|
|
adapter, NULL);
|
||
|
|
if (ACPI_FAILURE(status))
|
||
|
|
dev_warn(&adapter->dev, "failed to enumerate I2C slaves\n");
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(acpi_i2c_register_devices);
|