include/drm/drm_encoder_slave.h

   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  */
  48 struct 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                            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  */
  95 struct 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
 104 int 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  */
 120 struct 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  */
 135 static 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  */
 145 static 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  */
 155 static inline void drm_i2c_encoder_unregister(struct drm_i2c_encoder_driver *driver)
 156 {
 157         i2c_del_driver(&driver->i2c_driver);
 158 }
 159
 160 void drm_i2c_encoder_destroy(struct drm_encoder *encoder);
 161
 162 #endif