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I2C/ACPI: Clean up I2C ACPI code and Add CONFIG_I2C_ACPI config

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Clean up ACPI related code in the i2c core and add CONFIG_I2C_ACPI
to enable I2C ACPI code.

Current there is a race between removing I2C ACPI operation region
and ACPI AML code accessing. So make i2c core built-in if CONFIG_I2C_ACPI
is set.

Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Lan Tianyu
2014-05-20 20:59:24 +08:00
committed by Wolfram Sang
parent 5d98e61d33
commit da3c6647ee
5 changed files with 110 additions and 98 deletions
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95
drivers/i2c/i2c-core.c
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@@ -1092,101 +1092,6 @@ EXPORT_SYMBOL(of_find_i2c_adapter_by_node);
static void of_i2c_register_devices(struct i2c_adapter *adap) { }
#endif /* CONFIG_OF */
/* ACPI support code */
#if IS_ENABLED(CONFIG_ACPI)
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.companion = adev;
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;
adev->power.flags.ignore_parent = true;
strlcpy(info.type, dev_name(&adev->dev), sizeof(info.type));
if (!i2c_new_device(adapter, &info)) {
adev->power.flags.ignore_parent = false;
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
* @adap: 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.
*/
static void acpi_i2c_register_devices(struct i2c_adapter *adap)
{
acpi_handle handle;
acpi_status status;
if (!adap->dev.parent)
return;
handle = ACPI_HANDLE(adap->dev.parent);
if (!handle)
return;
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
acpi_i2c_add_device, NULL,
adap, NULL);
if (ACPI_FAILURE(status))
dev_warn(&adap->dev, "failed to enumerate I2C slaves\n");
}
#else
static inline void acpi_i2c_register_devices(struct i2c_adapter *adap) {}
#endif /* CONFIG_ACPI */
static int i2c_do_add_adapter(struct i2c_driver *driver,
struct i2c_adapter *adap)
{