mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-21 00:42:16 +00:00
117 lines
3.6 KiB
C
117 lines
3.6 KiB
C
/*
|
|
* Copyright (C) 2009 Francisco Jerez.
|
|
* All Rights Reserved.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
|
* a copy of this software and associated documentation files (the
|
|
* "Software"), to deal in the Software without restriction, including
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
|
* the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice (including the
|
|
* next paragraph) shall be included in all copies or substantial
|
|
* portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
|
* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
|
|
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
*/
|
|
|
|
#include "drm_encoder_slave.h"
|
|
|
|
/**
|
|
* drm_i2c_encoder_init - Initialize an I2C slave encoder
|
|
* @dev: DRM device.
|
|
* @encoder: Encoder to be attached to the I2C device. You aren't
|
|
* required to have called drm_encoder_init() before.
|
|
* @adap: I2C adapter that will be used to communicate with
|
|
* the device.
|
|
* @info: Information that will be used to create the I2C device.
|
|
* Required fields are @addr and @type.
|
|
*
|
|
* Create an I2C device on the specified bus (the module containing its
|
|
* driver is transparently loaded) and attach it to the specified
|
|
* &drm_encoder_slave. The @slave_funcs field will be initialized with
|
|
* the hooks provided by the slave driver.
|
|
*
|
|
* Returns 0 on success or a negative errno on failure, in particular,
|
|
* -ENODEV is returned when no matching driver is found.
|
|
*/
|
|
int drm_i2c_encoder_init(struct drm_device *dev,
|
|
struct drm_encoder_slave *encoder,
|
|
struct i2c_adapter *adap,
|
|
const struct i2c_board_info *info)
|
|
{
|
|
char modalias[sizeof(I2C_MODULE_PREFIX)
|
|
+ I2C_NAME_SIZE];
|
|
struct module *module = NULL;
|
|
struct i2c_client *client;
|
|
struct drm_i2c_encoder_driver *encoder_drv;
|
|
int err = 0;
|
|
|
|
snprintf(modalias, sizeof(modalias),
|
|
"%s%s", I2C_MODULE_PREFIX, info->type);
|
|
request_module(modalias);
|
|
|
|
client = i2c_new_device(adap, info);
|
|
if (!client) {
|
|
err = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
if (!client->driver) {
|
|
err = -ENODEV;
|
|
goto fail_unregister;
|
|
}
|
|
|
|
module = client->driver->driver.owner;
|
|
if (!try_module_get(module)) {
|
|
err = -ENODEV;
|
|
goto fail_unregister;
|
|
}
|
|
|
|
encoder->bus_priv = client;
|
|
|
|
encoder_drv = to_drm_i2c_encoder_driver(client->driver);
|
|
|
|
err = encoder_drv->encoder_init(client, dev, encoder);
|
|
if (err)
|
|
goto fail_unregister;
|
|
|
|
return 0;
|
|
|
|
fail_unregister:
|
|
i2c_unregister_device(client);
|
|
module_put(module);
|
|
fail:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(drm_i2c_encoder_init);
|
|
|
|
/**
|
|
* drm_i2c_encoder_destroy - Unregister the I2C device backing an encoder
|
|
* @drm_encoder: Encoder to be unregistered.
|
|
*
|
|
* This should be called from the @destroy method of an I2C slave
|
|
* encoder driver once I2C access is no longer needed.
|
|
*/
|
|
void drm_i2c_encoder_destroy(struct drm_encoder *drm_encoder)
|
|
{
|
|
struct drm_encoder_slave *encoder = to_encoder_slave(drm_encoder);
|
|
struct i2c_client *client = drm_i2c_encoder_get_client(drm_encoder);
|
|
struct module *module = client->driver->driver.owner;
|
|
|
|
i2c_unregister_device(client);
|
|
encoder->bus_priv = NULL;
|
|
|
|
module_put(module);
|
|
}
|
|
EXPORT_SYMBOL(drm_i2c_encoder_destroy);
|