mirror of https://gitee.com/openkylin/linux.git
i2c: move ACPI helpers into the core
This follows what has already been done for the DeviceTree helpers. Move the ACPI helpers from drivers/acpi/acpi_i2c.c to the I2C core and update documentation accordingly. This also solves a problem reported by Jerry Snitselaar that we can't build the ACPI I2C helpers as a module. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Mika Westerberg
Wolfram Sang
parent
687b81d083
commit
55e71edb81
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@ -228,18 +228,9 @@ ACPI handle like:
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I2C serial bus support
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~~~~~~~~~~~~~~~~~~~~~~
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The slaves behind I2C bus controller only need to add the ACPI IDs like
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with the platform and SPI drivers. However the I2C bus controller driver
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needs to call acpi_i2c_register_devices() after it has added the adapter.
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An I2C bus (controller) driver does:
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...
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ret = i2c_add_numbered_adapter(adapter);
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if (ret)
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/* handle error */
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/* Enumerate the slave devices behind this bus via ACPI */
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acpi_i2c_register_devices(adapter);
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with the platform and SPI drivers. The I2C core automatically enumerates
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any slave devices behind the controller device once the adapter is
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registered.
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Below is an example of how to add ACPI support to the existing mpu3050
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input driver:
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@ -180,12 +180,6 @@ config ACPI_DOCK
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This driver supports ACPI-controlled docking stations and removable
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drive bays such as the IBM Ultrabay and the Dell Module Bay.
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config ACPI_I2C
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def_tristate I2C
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depends on I2C
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help
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ACPI I2C enumeration support.
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config ACPI_PROCESSOR
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tristate "Processor"
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select THERMAL
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@ -73,7 +73,6 @@ obj-$(CONFIG_ACPI_HED) += hed.o
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obj-$(CONFIG_ACPI_EC_DEBUGFS) += ec_sys.o
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obj-$(CONFIG_ACPI_CUSTOM_METHOD)+= custom_method.o
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obj-$(CONFIG_ACPI_BGRT) += bgrt.o
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obj-$(CONFIG_ACPI_I2C) += acpi_i2c.o
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# processor has its own "processor." module_param namespace
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processor-y := processor_driver.o processor_throttling.o
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@ -1,103 +0,0 @@
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/*
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* ACPI I2C enumeration support
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*
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* Copyright (C) 2012, Intel Corporation
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* Author: Mika Westerberg <mika.westerberg@linux.intel.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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#include <linux/acpi.h>
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#include <linux/device.h>
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#include <linux/export.h>
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#include <linux/i2c.h>
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#include <linux/ioport.h>
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ACPI_MODULE_NAME("i2c");
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static int acpi_i2c_add_resource(struct acpi_resource *ares, void *data)
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{
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struct i2c_board_info *info = data;
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if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
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struct acpi_resource_i2c_serialbus *sb;
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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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info->addr = sb->slave_address;
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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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}
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} else if (info->irq < 0) {
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struct resource r;
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if (acpi_dev_resource_interrupt(ares, 0, &r))
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info->irq = r.start;
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}
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/* Tell the ACPI core to skip this resource */
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return 1;
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}
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static acpi_status acpi_i2c_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 list_head resource_list;
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struct i2c_board_info info;
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struct acpi_device *adev;
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int ret;
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if (acpi_bus_get_device(handle, &adev))
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return AE_OK;
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if (acpi_bus_get_status(adev) || !adev->status.present)
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return AE_OK;
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memset(&info, 0, sizeof(info));
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info.acpi_node.handle = handle;
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info.irq = -1;
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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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acpi_i2c_add_resource, &info);
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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 AE_OK;
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strlcpy(info.type, dev_name(&adev->dev), sizeof(info.type));
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if (!i2c_new_device(adapter, &info)) {
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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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return AE_OK;
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}
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/**
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* acpi_i2c_register_devices - enumerate I2C slave devices behind adapter
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* @adapter: 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 acpi_i2c_register_devices(struct i2c_adapter *adapter)
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{
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acpi_handle handle;
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acpi_status status;
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handle = ACPI_HANDLE(adapter->dev.parent);
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if (!handle)
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return;
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
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acpi_i2c_add_device, NULL,
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adapter, NULL);
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if (ACPI_FAILURE(status))
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dev_warn(&adapter->dev, "failed to enumerate I2C slaves\n");
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}
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EXPORT_SYMBOL_GPL(acpi_i2c_register_devices);
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@ -171,7 +171,6 @@ static int dw_i2c_probe(struct platform_device *pdev)
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dev_err(&pdev->dev, "failure adding adapter\n");
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return r;
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}
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acpi_i2c_register_devices(adap);
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pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
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pm_runtime_use_autosuspend(&pdev->dev);
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@ -1058,6 +1058,96 @@ EXPORT_SYMBOL(of_find_i2c_adapter_by_node);
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static void of_i2c_register_devices(struct i2c_adapter *adap) { }
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#endif /* CONFIG_OF */
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/* ACPI support code */
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#if IS_ENABLED(CONFIG_ACPI)
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static int acpi_i2c_add_resource(struct acpi_resource *ares, void *data)
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{
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struct i2c_board_info *info = data;
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if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
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struct acpi_resource_i2c_serialbus *sb;
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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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info->addr = sb->slave_address;
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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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}
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} else if (info->irq < 0) {
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struct resource r;
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if (acpi_dev_resource_interrupt(ares, 0, &r))
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info->irq = r.start;
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}
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/* Tell the ACPI core to skip this resource */
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return 1;
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}
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static acpi_status acpi_i2c_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 list_head resource_list;
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struct i2c_board_info info;
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struct acpi_device *adev;
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int ret;
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if (acpi_bus_get_device(handle, &adev))
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return AE_OK;
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if (acpi_bus_get_status(adev) || !adev->status.present)
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return AE_OK;
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memset(&info, 0, sizeof(info));
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info.acpi_node.handle = handle;
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info.irq = -1;
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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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acpi_i2c_add_resource, &info);
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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 AE_OK;
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strlcpy(info.type, dev_name(&adev->dev), sizeof(info.type));
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if (!i2c_new_device(adapter, &info)) {
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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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return AE_OK;
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}
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/**
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* acpi_i2c_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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static void acpi_i2c_register_devices(struct i2c_adapter *adap)
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{
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acpi_handle handle;
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acpi_status status;
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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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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
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acpi_i2c_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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}
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#else
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static inline void acpi_i2c_register_devices(struct i2c_adapter *adap) {}
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#endif /* CONFIG_ACPI */
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static int i2c_do_add_adapter(struct i2c_driver *driver,
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struct i2c_adapter *adap)
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{
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@ -1163,6 +1253,7 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
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exit_recovery:
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/* create pre-declared device nodes */
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of_i2c_register_devices(adap);
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acpi_i2c_register_devices(adap);
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if (adap->nr < __i2c_first_dynamic_bus_num)
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i2c_scan_static_board_info(adap);
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@ -564,10 +564,4 @@ static inline struct i2c_adapter *of_find_i2c_adapter_by_node(struct device_node
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}
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#endif /* CONFIG_OF */
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#if IS_ENABLED(CONFIG_ACPI_I2C)
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extern void acpi_i2c_register_devices(struct i2c_adapter *adap);
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#else
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static inline void acpi_i2c_register_devices(struct i2c_adapter *adap) {}
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#endif
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#endif /* _LINUX_I2C_H */
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