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
163