linux/include/drm/drm_encoder_slave.h
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   1/*
   2 * Copyright (C) 2009 Francisco Jerez.
   3 * All Rights Reserved.
   4 *
   5 * Permission is hereby granted, free of charge, to any person obtaining
   6 * a copy of this software and associated documentation files (the
   7 * "Software"), to deal in the Software without restriction, including
   8 * without limitation the rights to use, copy, modify, merge, publish,
   9 * distribute, sublicense, and/or sell copies of the Software, and to
  10 * permit persons to whom the Software is furnished to do so, subject to
  11 * the following conditions:
  12 *
  13 * The above copyright notice and this permission notice (including the
  14 * next paragraph) shall be included in all copies or substantial
  15 * portions of the Software.
  16 *
  17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24 *
  25 */
  26
  27#ifndef __DRM_ENCODER_SLAVE_H__
  28#define __DRM_ENCODER_SLAVE_H__
  29
  30#include "drmP.h"
  31#include "drm_crtc.h"
  32
  33/**
  34 * struct drm_encoder_slave_funcs - Entry points exposed by a slave encoder driver
  35 * @set_config: Initialize any encoder-specific modesetting parameters.
  36 *              The meaning of the @params parameter is implementation
  37 *              dependent. It will usually be a structure with DVO port
  38 *              data format settings or timings. It's not required for
  39 *              the new parameters to take effect until the next mode
  40 *              is set.
  41 *
  42 * Most of its members are analogous to the function pointers in
  43 * &drm_encoder_helper_funcs and they can optionally be used to
  44 * initialize the latter. Connector-like methods (e.g. @get_modes and
  45 * @set_property) will typically be wrapped around and only be called
  46 * if the encoder is the currently selected one for the connector.
  47 */
  48struct drm_encoder_slave_funcs {
  49        void (*set_config)(struct drm_encoder *encoder,
  50                           void *params);
  51
  52        void (*destroy)(struct drm_encoder *encoder);
  53        void (*dpms)(struct drm_encoder *encoder, int mode);
  54        void (*save)(struct drm_encoder *encoder);
  55        void (*restore)(struct drm_encoder *encoder);
  56        bool (*mode_fixup)(struct drm_encoder *encoder,
  57                           const struct drm_display_mode *mode,
  58                           struct drm_display_mode *adjusted_mode);
  59        int (*mode_valid)(struct drm_encoder *encoder,
  60                          struct drm_display_mode *mode);
  61        void (*mode_set)(struct drm_encoder *encoder,
  62                         struct drm_display_mode *mode,
  63                         struct drm_display_mode *adjusted_mode);
  64
  65        enum drm_connector_status (*detect)(struct drm_encoder *encoder,
  66                                            struct drm_connector *connector);
  67        int (*get_modes)(struct drm_encoder *encoder,
  68                         struct drm_connector *connector);
  69        int (*create_resources)(struct drm_encoder *encoder,
  70                                 struct drm_connector *connector);
  71        int (*set_property)(struct drm_encoder *encoder,
  72                            struct drm_connector *connector,
  73                            struct drm_property *property,
  74                            uint64_t val);
  75
  76};
  77
  78/**
  79 * struct drm_encoder_slave - Slave encoder struct
  80 * @base: DRM encoder object.
  81 * @slave_funcs: Slave encoder callbacks.
  82 * @slave_priv: Slave encoder private data.
  83 * @bus_priv: Bus specific data.
  84 *
  85 * A &drm_encoder_slave has two sets of callbacks, @slave_funcs and the
  86 * ones in @base. The former are never actually called by the common
  87 * CRTC code, it's just a convenience for splitting the encoder
  88 * functions in an upper, GPU-specific layer and a (hopefully)
  89 * GPU-agnostic lower layer: It's the GPU driver responsibility to
  90 * call the slave methods when appropriate.
  91 *
  92 * drm_i2c_encoder_init() provides a way to get an implementation of
  93 * this.
  94 */
  95struct drm_encoder_slave {
  96        struct drm_encoder base;
  97
  98        struct drm_encoder_slave_funcs *slave_funcs;
  99        void *slave_priv;
 100        void *bus_priv;
 101};
 102#define to_encoder_slave(x) container_of((x), struct drm_encoder_slave, base)
 103
 104int drm_i2c_encoder_init(struct drm_device *dev,
 105                         struct drm_encoder_slave *encoder,
 106                         struct i2c_adapter *adap,
 107                         const struct i2c_board_info *info);
 108
 109
 110/**
 111 * struct drm_i2c_encoder_driver
 112 *
 113 * Describes a device driver for an encoder connected to the GPU
 114 * through an I2C bus. In addition to the entry points in @i2c_driver
 115 * an @encoder_init function should be provided. It will be called to
 116 * give the driver an opportunity to allocate any per-encoder data
 117 * structures and to initialize the @slave_funcs and (optionally)
 118 * @slave_priv members of @encoder.
 119 */
 120struct drm_i2c_encoder_driver {
 121        struct i2c_driver i2c_driver;
 122
 123        int (*encoder_init)(struct i2c_client *client,
 124                            struct drm_device *dev,
 125                            struct drm_encoder_slave *encoder);
 126
 127};
 128#define to_drm_i2c_encoder_driver(x) container_of((x),                  \
 129                                                  struct drm_i2c_encoder_driver, \
 130                                                  i2c_driver)
 131
 132/**
 133 * drm_i2c_encoder_get_client - Get the I2C client corresponding to an encoder
 134 */
 135static inline struct i2c_client *drm_i2c_encoder_get_client(struct drm_encoder *encoder)
 136{
 137        return (struct i2c_client *)to_encoder_slave(encoder)->bus_priv;
 138}
 139
 140/**
 141 * drm_i2c_encoder_register - Register an I2C encoder driver
 142 * @owner:      Module containing the driver.
 143 * @driver:     Driver to be registered.
 144 */
 145static inline int drm_i2c_encoder_register(struct module *owner,
 146                                           struct drm_i2c_encoder_driver *driver)
 147{
 148        return i2c_register_driver(owner, &driver->i2c_driver);
 149}
 150
 151/**
 152 * drm_i2c_encoder_unregister - Unregister an I2C encoder driver
 153 * @driver:     Driver to be unregistered.
 154 */
 155static inline void drm_i2c_encoder_unregister(struct drm_i2c_encoder_driver *driver)
 156{
 157        i2c_del_driver(&driver->i2c_driver);
 158}
 159
 160void drm_i2c_encoder_destroy(struct drm_encoder *encoder);
 161
 162#endif
 163
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