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sys/dev/drm/core/drm_encoder_slave.c
- This file was added.
/* | |||||
* 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 <linux/module.h> | |||||
#include <drm/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. | |||||
* | |||||
* If @info.platform_data is non-NULL it will be used as the initial | |||||
* slave config. | |||||
* | |||||
* 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) | |||||
{ | |||||
struct module *module = NULL; | |||||
struct i2c_client *client; | |||||
struct drm_i2c_encoder_driver *encoder_drv; | |||||
int err = 0; | |||||
request_module("%s%s", I2C_MODULE_PREFIX, info->type); | |||||
client = i2c_new_device(adap, info); | |||||
if (!client) { | |||||
err = -ENOMEM; | |||||
goto fail; | |||||
} | |||||
if (!client->dev.driver) { | |||||
err = -ENODEV; | |||||
goto fail_unregister; | |||||
} | |||||
module = client->dev.driver->owner; | |||||
if (!try_module_get(module)) { | |||||
err = -ENODEV; | |||||
goto fail_unregister; | |||||
} | |||||
encoder->bus_priv = client; | |||||
encoder_drv = to_drm_i2c_encoder_driver(to_i2c_driver(client->dev.driver)); | |||||
err = encoder_drv->encoder_init(client, dev, encoder); | |||||
if (err) | |||||
goto fail_unregister; | |||||
if (info->platform_data) | |||||
encoder->slave_funcs->set_config(&encoder->base, | |||||
info->platform_data); | |||||
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->dev.driver->owner; | |||||
i2c_unregister_device(client); | |||||
encoder->bus_priv = NULL; | |||||
module_put(module); | |||||
} | |||||
EXPORT_SYMBOL(drm_i2c_encoder_destroy); | |||||
/* | |||||
* Wrapper fxns which can be plugged in to drm_encoder_helper_funcs: | |||||
*/ | |||||
static inline const struct drm_encoder_slave_funcs * | |||||
get_slave_funcs(struct drm_encoder *enc) | |||||
{ | |||||
return to_encoder_slave(enc)->slave_funcs; | |||||
} | |||||
void drm_i2c_encoder_dpms(struct drm_encoder *encoder, int mode) | |||||
{ | |||||
get_slave_funcs(encoder)->dpms(encoder, mode); | |||||
} | |||||
EXPORT_SYMBOL(drm_i2c_encoder_dpms); | |||||
bool drm_i2c_encoder_mode_fixup(struct drm_encoder *encoder, | |||||
const struct drm_display_mode *mode, | |||||
struct drm_display_mode *adjusted_mode) | |||||
{ | |||||
if (!get_slave_funcs(encoder)->mode_fixup) | |||||
return true; | |||||
return get_slave_funcs(encoder)->mode_fixup(encoder, mode, adjusted_mode); | |||||
} | |||||
EXPORT_SYMBOL(drm_i2c_encoder_mode_fixup); | |||||
void drm_i2c_encoder_prepare(struct drm_encoder *encoder) | |||||
{ | |||||
drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_OFF); | |||||
} | |||||
EXPORT_SYMBOL(drm_i2c_encoder_prepare); | |||||
void drm_i2c_encoder_commit(struct drm_encoder *encoder) | |||||
{ | |||||
drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_ON); | |||||
} | |||||
EXPORT_SYMBOL(drm_i2c_encoder_commit); | |||||
void drm_i2c_encoder_mode_set(struct drm_encoder *encoder, | |||||
struct drm_display_mode *mode, | |||||
struct drm_display_mode *adjusted_mode) | |||||
{ | |||||
get_slave_funcs(encoder)->mode_set(encoder, mode, adjusted_mode); | |||||
} | |||||
EXPORT_SYMBOL(drm_i2c_encoder_mode_set); | |||||
enum drm_connector_status drm_i2c_encoder_detect(struct drm_encoder *encoder, | |||||
struct drm_connector *connector) | |||||
{ | |||||
return get_slave_funcs(encoder)->detect(encoder, connector); | |||||
} | |||||
EXPORT_SYMBOL(drm_i2c_encoder_detect); | |||||
void drm_i2c_encoder_save(struct drm_encoder *encoder) | |||||
{ | |||||
get_slave_funcs(encoder)->save(encoder); | |||||
} | |||||
EXPORT_SYMBOL(drm_i2c_encoder_save); | |||||
void drm_i2c_encoder_restore(struct drm_encoder *encoder) | |||||
{ | |||||
get_slave_funcs(encoder)->restore(encoder); | |||||
} | |||||
EXPORT_SYMBOL(drm_i2c_encoder_restore); |