2 * Copyright (C) 2009 Francisco Jerez.
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:
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.
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.
27 #include <linux/module.h>
29 #include <drm/drm_encoder_slave.h>
32 * drm_i2c_encoder_init - Initialize an I2C slave encoder
34 * @encoder: Encoder to be attached to the I2C device. You aren't
35 * required to have called drm_encoder_init() before.
36 * @adap: I2C adapter that will be used to communicate with
38 * @info: Information that will be used to create the I2C device.
39 * Required fields are @addr and @type.
41 * Create an I2C device on the specified bus (the module containing its
42 * driver is transparently loaded) and attach it to the specified
43 * &drm_encoder_slave. The @slave_funcs field will be initialized with
44 * the hooks provided by the slave driver.
46 * If @info->platform_data is non-NULL it will be used as the initial
49 * Returns 0 on success or a negative errno on failure, in particular,
50 * -ENODEV is returned when no matching driver is found.
52 int drm_i2c_encoder_init(struct drm_device
*dev
,
53 struct drm_encoder_slave
*encoder
,
54 struct i2c_adapter
*adap
,
55 const struct i2c_board_info
*info
)
57 char modalias
[sizeof(I2C_MODULE_PREFIX
)
59 struct module
*module
= NULL
;
60 struct i2c_client
*client
;
61 struct drm_i2c_encoder_driver
*encoder_drv
;
64 snprintf(modalias
, sizeof(modalias
),
65 "%s%s", I2C_MODULE_PREFIX
, info
->type
);
66 request_module(modalias
);
68 client
= i2c_new_device(adap
, info
);
74 if (!client
->driver
) {
79 module
= client
->driver
->driver
.owner
;
80 if (!try_module_get(module
)) {
85 encoder
->bus_priv
= client
;
87 encoder_drv
= to_drm_i2c_encoder_driver(client
->driver
);
89 err
= encoder_drv
->encoder_init(client
, dev
, encoder
);
93 if (info
->platform_data
)
94 encoder
->slave_funcs
->set_config(&encoder
->base
,
100 i2c_unregister_device(client
);
105 EXPORT_SYMBOL(drm_i2c_encoder_init
);
108 * drm_i2c_encoder_destroy - Unregister the I2C device backing an encoder
109 * @drm_encoder: Encoder to be unregistered.
111 * This should be called from the @destroy method of an I2C slave
112 * encoder driver once I2C access is no longer needed.
114 void drm_i2c_encoder_destroy(struct drm_encoder
*drm_encoder
)
116 struct drm_encoder_slave
*encoder
= to_encoder_slave(drm_encoder
);
117 struct i2c_client
*client
= drm_i2c_encoder_get_client(drm_encoder
);
118 struct module
*module
= client
->driver
->driver
.owner
;
120 i2c_unregister_device(client
);
121 encoder
->bus_priv
= NULL
;
125 EXPORT_SYMBOL(drm_i2c_encoder_destroy
);
128 * Wrapper fxns which can be plugged in to drm_encoder_helper_funcs:
131 static inline struct drm_encoder_slave_funcs
*
132 get_slave_funcs(struct drm_encoder
*enc
)
134 return to_encoder_slave(enc
)->slave_funcs
;
137 void drm_i2c_encoder_dpms(struct drm_encoder
*encoder
, int mode
)
139 get_slave_funcs(encoder
)->dpms(encoder
, mode
);
141 EXPORT_SYMBOL(drm_i2c_encoder_dpms
);
143 bool drm_i2c_encoder_mode_fixup(struct drm_encoder
*encoder
,
144 const struct drm_display_mode
*mode
,
145 struct drm_display_mode
*adjusted_mode
)
147 return get_slave_funcs(encoder
)->mode_fixup(encoder
, mode
, adjusted_mode
);
149 EXPORT_SYMBOL(drm_i2c_encoder_mode_fixup
);
151 void drm_i2c_encoder_prepare(struct drm_encoder
*encoder
)
153 drm_i2c_encoder_dpms(encoder
, DRM_MODE_DPMS_OFF
);
155 EXPORT_SYMBOL(drm_i2c_encoder_prepare
);
157 void drm_i2c_encoder_commit(struct drm_encoder
*encoder
)
159 drm_i2c_encoder_dpms(encoder
, DRM_MODE_DPMS_ON
);
161 EXPORT_SYMBOL(drm_i2c_encoder_commit
);
163 void drm_i2c_encoder_mode_set(struct drm_encoder
*encoder
,
164 struct drm_display_mode
*mode
,
165 struct drm_display_mode
*adjusted_mode
)
167 get_slave_funcs(encoder
)->mode_set(encoder
, mode
, adjusted_mode
);
169 EXPORT_SYMBOL(drm_i2c_encoder_mode_set
);
171 enum drm_connector_status
drm_i2c_encoder_detect(struct drm_encoder
*encoder
,
172 struct drm_connector
*connector
)
174 return get_slave_funcs(encoder
)->detect(encoder
, connector
);
176 EXPORT_SYMBOL(drm_i2c_encoder_detect
);
178 void drm_i2c_encoder_save(struct drm_encoder
*encoder
)
180 get_slave_funcs(encoder
)->save(encoder
);
182 EXPORT_SYMBOL(drm_i2c_encoder_save
);
184 void drm_i2c_encoder_restore(struct drm_encoder
*encoder
)
186 get_slave_funcs(encoder
)->restore(encoder
);
188 EXPORT_SYMBOL(drm_i2c_encoder_restore
);