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![Daniel Vetter](/assets/img/avatar_default.png)
I just learned that &struct_name.member_name works and looks pretty even. It doesn't (yet) link to the member directly though, which would be really good for big structures or vfunc tables (where the per-member kerneldoc tends to be long). Also some minor drive-by polish where it makes sense, I read a lot of docs ... v2: Review from Eric. Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170125062657.19270-4-daniel.vetter@ffwll.ch
187 lines
5.4 KiB
C
187 lines
5.4 KiB
C
/*
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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_device(adap, info);
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if (!client) {
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err = -ENOMEM;
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goto fail;
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}
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if (!client->dev.driver) {
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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_unregister;
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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_unregister:
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i2c_unregister_device(client);
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module_put(module);
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fail:
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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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