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 <drm/drmP.h>
31 #include <drm/drm_crtc.h>
32 #include <drm/drm_encoder.h>
33 
34 /**
35  * struct drm_encoder_slave_funcs - Entry points exposed by a slave encoder driver
36  * @set_config:	Initialize any encoder-specific modesetting parameters.
37  *		The meaning of the @params parameter is implementation
38  *		dependent. It will usually be a structure with DVO port
39  *		data format settings or timings. It's not required for
40  *		the new parameters to take effect until the next mode
41  *		is set.
42  *
43  * Most of its members are analogous to the function pointers in
44  * &drm_encoder_helper_funcs and they can optionally be used to
45  * initialize the latter. Connector-like methods (e.g. @get_modes and
46  * @set_property) will typically be wrapped around and only be called
47  * if the encoder is the currently selected one for the connector.
48  */
49 struct drm_encoder_slave_funcs {
50 	void (*set_config)(struct drm_encoder *encoder,
51 			   void *params);
52 
53 	void (*destroy)(struct drm_encoder *encoder);
54 	void (*dpms)(struct drm_encoder *encoder, int mode);
55 	void (*save)(struct drm_encoder *encoder);
56 	void (*restore)(struct drm_encoder *encoder);
57 	bool (*mode_fixup)(struct drm_encoder *encoder,
58 			   const struct drm_display_mode *mode,
59 			   struct drm_display_mode *adjusted_mode);
60 	int (*mode_valid)(struct drm_encoder *encoder,
61 			  struct drm_display_mode *mode);
62 	void (*mode_set)(struct drm_encoder *encoder,
63 			 struct drm_display_mode *mode,
64 			 struct drm_display_mode *adjusted_mode);
65 
66 	enum drm_connector_status (*detect)(struct drm_encoder *encoder,
67 					    struct drm_connector *connector);
68 	int (*get_modes)(struct drm_encoder *encoder,
69 			 struct drm_connector *connector);
70 	int (*create_resources)(struct drm_encoder *encoder,
71 				 struct drm_connector *connector);
72 	int (*set_property)(struct drm_encoder *encoder,
73 			    struct drm_connector *connector,
74 			    struct drm_property *property,
75 			    uint64_t val);
76 
77 };
78 
79 /**
80  * struct drm_encoder_slave - Slave encoder struct
81  * @base: DRM encoder object.
82  * @slave_funcs: Slave encoder callbacks.
83  * @slave_priv: Slave encoder private data.
84  * @bus_priv: Bus specific data.
85  *
86  * A &drm_encoder_slave has two sets of callbacks, @slave_funcs and the
87  * ones in @base. The former are never actually called by the common
88  * CRTC code, it's just a convenience for splitting the encoder
89  * functions in an upper, GPU-specific layer and a (hopefully)
90  * GPU-agnostic lower layer: It's the GPU driver responsibility to
91  * call the slave methods when appropriate.
92  *
93  * drm_i2c_encoder_init() provides a way to get an implementation of
94  * this.
95  */
96 struct drm_encoder_slave {
97 	struct drm_encoder base;
98 
99 	const struct drm_encoder_slave_funcs *slave_funcs;
100 	void *slave_priv;
101 	void *bus_priv;
102 };
103 #define to_encoder_slave(x) container_of((x), struct drm_encoder_slave, base)
104 
105 int drm_i2c_encoder_init(struct drm_device *dev,
106 			 struct drm_encoder_slave *encoder,
107 			 struct i2c_adapter *adap,
108 			 const struct i2c_board_info *info);
109 
110 
111 /**
112  * struct drm_i2c_encoder_driver
113  *
114  * Describes a device driver for an encoder connected to the GPU
115  * through an I2C bus. In addition to the entry points in @i2c_driver
116  * an @encoder_init function should be provided. It will be called to
117  * give the driver an opportunity to allocate any per-encoder data
118  * structures and to initialize the @slave_funcs and (optionally)
119  * @slave_priv members of @encoder.
120  */
121 struct drm_i2c_encoder_driver {
122 	struct i2c_driver i2c_driver;
123 
124 	int (*encoder_init)(struct i2c_client *client,
125 			    struct drm_device *dev,
126 			    struct drm_encoder_slave *encoder);
127 
128 };
129 #define to_drm_i2c_encoder_driver(x) container_of((x),			\
130 						  struct drm_i2c_encoder_driver, \
131 						  i2c_driver)
132 
133 /**
134  * drm_i2c_encoder_get_client - Get the I2C client corresponding to an encoder
135  */
136 static inline struct i2c_client *drm_i2c_encoder_get_client(struct drm_encoder *encoder)
137 {
138 	return (struct i2c_client *)to_encoder_slave(encoder)->bus_priv;
139 }
140 
141 /**
142  * drm_i2c_encoder_register - Register an I2C encoder driver
143  * @owner:	Module containing the driver.
144  * @driver:	Driver to be registered.
145  */
146 static inline int drm_i2c_encoder_register(struct module *owner,
147 					   struct drm_i2c_encoder_driver *driver)
148 {
149 	return i2c_register_driver(owner, &driver->i2c_driver);
150 }
151 
152 /**
153  * drm_i2c_encoder_unregister - Unregister an I2C encoder driver
154  * @driver:	Driver to be unregistered.
155  */
156 static inline void drm_i2c_encoder_unregister(struct drm_i2c_encoder_driver *driver)
157 {
158 	i2c_del_driver(&driver->i2c_driver);
159 }
160 
161 void drm_i2c_encoder_destroy(struct drm_encoder *encoder);
162 
163 
164 /*
165  * Wrapper fxns which can be plugged in to drm_encoder_helper_funcs:
166  */
167 
168 void drm_i2c_encoder_dpms(struct drm_encoder *encoder, int mode);
169 bool drm_i2c_encoder_mode_fixup(struct drm_encoder *encoder,
170 		const struct drm_display_mode *mode,
171 		struct drm_display_mode *adjusted_mode);
172 void drm_i2c_encoder_prepare(struct drm_encoder *encoder);
173 void drm_i2c_encoder_commit(struct drm_encoder *encoder);
174 void drm_i2c_encoder_mode_set(struct drm_encoder *encoder,
175 		struct drm_display_mode *mode,
176 		struct drm_display_mode *adjusted_mode);
177 enum drm_connector_status drm_i2c_encoder_detect(struct drm_encoder *encoder,
178 	    struct drm_connector *connector);
179 void drm_i2c_encoder_save(struct drm_encoder *encoder);
180 void drm_i2c_encoder_restore(struct drm_encoder *encoder);
181 
182 
183 #endif
184