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182 lines
5.4 KiB
182 lines
5.4 KiB
/* |
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* Copyright (C) 2009 Francisco Jerez. |
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* All Rights Reserved. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining |
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* a copy of this software and associated documentation files (the |
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* "Software"), to deal in the Software without restriction, including |
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* without limitation the rights to use, copy, modify, merge, publish, |
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* distribute, sublicense, and/or sell copies of the Software, and to |
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* permit persons to whom the Software is furnished to do so, subject to |
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* the following conditions: |
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* |
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* The above copyright notice and this permission notice (including the |
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* next paragraph) shall be included in all copies or substantial |
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* portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
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* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE |
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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* |
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*/ |
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#include <linux/module.h> |
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#include <drm/drm_encoder_slave.h> |
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/** |
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* drm_i2c_encoder_init - Initialize an I2C slave encoder |
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* @dev: DRM device. |
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* @encoder: Encoder to be attached to the I2C device. You aren't |
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* required to have called drm_encoder_init() before. |
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* @adap: I2C adapter that will be used to communicate with |
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* the device. |
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* @info: Information that will be used to create the I2C device. |
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* Required fields are @addr and @type. |
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* |
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* Create an I2C device on the specified bus (the module containing its |
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* driver is transparently loaded) and attach it to the specified |
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* &drm_encoder_slave. The @slave_funcs field will be initialized with |
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* the hooks provided by the slave driver. |
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* |
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* If @info.platform_data is non-NULL it will be used as the initial |
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* slave config. |
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* |
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* Returns 0 on success or a negative errno on failure, in particular, |
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* -ENODEV is returned when no matching driver is found. |
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*/ |
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int drm_i2c_encoder_init(struct drm_device *dev, |
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struct drm_encoder_slave *encoder, |
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struct i2c_adapter *adap, |
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const struct i2c_board_info *info) |
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{ |
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struct module *module = NULL; |
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struct i2c_client *client; |
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struct drm_i2c_encoder_driver *encoder_drv; |
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int err = 0; |
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request_module("%s%s", I2C_MODULE_PREFIX, info->type); |
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client = i2c_new_client_device(adap, info); |
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if (!i2c_client_has_driver(client)) { |
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err = -ENODEV; |
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goto fail_unregister; |
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} |
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module = client->dev.driver->owner; |
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if (!try_module_get(module)) { |
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err = -ENODEV; |
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goto fail_unregister; |
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} |
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encoder->bus_priv = client; |
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encoder_drv = to_drm_i2c_encoder_driver(to_i2c_driver(client->dev.driver)); |
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err = encoder_drv->encoder_init(client, dev, encoder); |
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if (err) |
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goto fail_module_put; |
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if (info->platform_data) |
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encoder->slave_funcs->set_config(&encoder->base, |
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info->platform_data); |
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return 0; |
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fail_module_put: |
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module_put(module); |
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fail_unregister: |
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i2c_unregister_device(client); |
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return err; |
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} |
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EXPORT_SYMBOL(drm_i2c_encoder_init); |
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/** |
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* drm_i2c_encoder_destroy - Unregister the I2C device backing an encoder |
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* @drm_encoder: Encoder to be unregistered. |
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* |
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* This should be called from the @destroy method of an I2C slave |
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* encoder driver once I2C access is no longer needed. |
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*/ |
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void drm_i2c_encoder_destroy(struct drm_encoder *drm_encoder) |
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{ |
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struct drm_encoder_slave *encoder = to_encoder_slave(drm_encoder); |
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struct i2c_client *client = drm_i2c_encoder_get_client(drm_encoder); |
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struct module *module = client->dev.driver->owner; |
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i2c_unregister_device(client); |
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encoder->bus_priv = NULL; |
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module_put(module); |
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} |
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EXPORT_SYMBOL(drm_i2c_encoder_destroy); |
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/* |
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* Wrapper fxns which can be plugged in to drm_encoder_helper_funcs: |
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*/ |
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static inline const struct drm_encoder_slave_funcs * |
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get_slave_funcs(struct drm_encoder *enc) |
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{ |
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return to_encoder_slave(enc)->slave_funcs; |
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} |
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void drm_i2c_encoder_dpms(struct drm_encoder *encoder, int mode) |
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{ |
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get_slave_funcs(encoder)->dpms(encoder, mode); |
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} |
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EXPORT_SYMBOL(drm_i2c_encoder_dpms); |
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bool drm_i2c_encoder_mode_fixup(struct drm_encoder *encoder, |
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const struct drm_display_mode *mode, |
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struct drm_display_mode *adjusted_mode) |
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{ |
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if (!get_slave_funcs(encoder)->mode_fixup) |
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return true; |
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return get_slave_funcs(encoder)->mode_fixup(encoder, mode, adjusted_mode); |
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} |
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EXPORT_SYMBOL(drm_i2c_encoder_mode_fixup); |
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void drm_i2c_encoder_prepare(struct drm_encoder *encoder) |
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{ |
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drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_OFF); |
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} |
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EXPORT_SYMBOL(drm_i2c_encoder_prepare); |
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void drm_i2c_encoder_commit(struct drm_encoder *encoder) |
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{ |
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drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_ON); |
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} |
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EXPORT_SYMBOL(drm_i2c_encoder_commit); |
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void drm_i2c_encoder_mode_set(struct drm_encoder *encoder, |
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struct drm_display_mode *mode, |
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struct drm_display_mode *adjusted_mode) |
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{ |
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get_slave_funcs(encoder)->mode_set(encoder, mode, adjusted_mode); |
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} |
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EXPORT_SYMBOL(drm_i2c_encoder_mode_set); |
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enum drm_connector_status drm_i2c_encoder_detect(struct drm_encoder *encoder, |
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struct drm_connector *connector) |
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{ |
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return get_slave_funcs(encoder)->detect(encoder, connector); |
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} |
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EXPORT_SYMBOL(drm_i2c_encoder_detect); |
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void drm_i2c_encoder_save(struct drm_encoder *encoder) |
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{ |
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get_slave_funcs(encoder)->save(encoder); |
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} |
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EXPORT_SYMBOL(drm_i2c_encoder_save); |
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void drm_i2c_encoder_restore(struct drm_encoder *encoder) |
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{ |
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get_slave_funcs(encoder)->restore(encoder); |
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} |
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EXPORT_SYMBOL(drm_i2c_encoder_restore);
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