drm_encoder_slave.c revision 1.3 
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#include <linux/module.h>
28
29#include <drm/drm_encoder_slave.h>
30
31#ifdef notyet
32/**
33 * drm_i2c_encoder_init - Initialize an I2C slave encoder
34 * @dev:	DRM device.
35 * @encoder:    Encoder to be attached to the I2C device. You aren't
36 *		required to have called drm_encoder_init() before.
37 * @adap:	I2C adapter that will be used to communicate with
38 *		the device.
39 * @info:	Information that will be used to create the I2C device.
40 *		Required fields are @addr and @type.
41 *
42 * Create an I2C device on the specified bus (the module containing its
43 * driver is transparently loaded) and attach it to the specified
44 * &drm_encoder_slave. The @slave_funcs field will be initialized with
45 * the hooks provided by the slave driver.
46 *
47 * If @info.platform_data is non-NULL it will be used as the initial
48 * slave config.
49 *
50 * Returns 0 on success or a negative errno on failure, in particular,
51 * -ENODEV is returned when no matching driver is found.
52 */
53int drm_i2c_encoder_init(struct drm_device *dev,
54			 struct drm_encoder_slave *encoder,
55			 struct i2c_adapter *adap,
56			 const struct i2c_board_info *info)
57{
58	struct module *module = NULL;
59	struct i2c_client *client;
60	struct drm_i2c_encoder_driver *encoder_drv;
61	int err = 0;
62
63	request_module("%s%s", I2C_MODULE_PREFIX, info->type);
64
65	client = i2c_new_client_device(adap, info);
66	if (!i2c_client_has_driver(client)) {
67		err = -ENODEV;
68		goto fail_unregister;
69	}
70
71	module = client->dev.driver->owner;
72	if (!try_module_get(module)) {
73		err = -ENODEV;
74		goto fail_unregister;
75	}
76
77	encoder->bus_priv = client;
78
79	encoder_drv = to_drm_i2c_encoder_driver(to_i2c_driver(client->dev.driver));
80
81	err = encoder_drv->encoder_init(client, dev, encoder);
82	if (err)
83		goto fail_module_put;
84
85	if (info->platform_data)
86		encoder->slave_funcs->set_config(&encoder->base,
87						 info->platform_data);
88
89	return 0;
90
91fail_module_put:
92	module_put(module);
93fail_unregister:
94	i2c_unregister_device(client);
95	return err;
96}
97EXPORT_SYMBOL(drm_i2c_encoder_init);
98
99/**
100 * drm_i2c_encoder_destroy - Unregister the I2C device backing an encoder
101 * @drm_encoder:	Encoder to be unregistered.
102 *
103 * This should be called from the @destroy method of an I2C slave
104 * encoder driver once I2C access is no longer needed.
105 */
106void drm_i2c_encoder_destroy(struct drm_encoder *drm_encoder)
107{
108	struct drm_encoder_slave *encoder = to_encoder_slave(drm_encoder);
109	struct i2c_client *client = drm_i2c_encoder_get_client(drm_encoder);
110	struct module *module = client->dev.driver->owner;
111
112	i2c_unregister_device(client);
113	encoder->bus_priv = NULL;
114
115	module_put(module);
116}
117EXPORT_SYMBOL(drm_i2c_encoder_destroy);
118#endif /* notyet */
119
120/*
121 * Wrapper fxns which can be plugged in to drm_encoder_helper_funcs:
122 */
123
124static inline const struct drm_encoder_slave_funcs *
125get_slave_funcs(struct drm_encoder *enc)
126{
127	return to_encoder_slave(enc)->slave_funcs;
128}
129
130void drm_i2c_encoder_dpms(struct drm_encoder *encoder, int mode)
131{
132	get_slave_funcs(encoder)->dpms(encoder, mode);
133}
134EXPORT_SYMBOL(drm_i2c_encoder_dpms);
135
136bool drm_i2c_encoder_mode_fixup(struct drm_encoder *encoder,
137		const struct drm_display_mode *mode,
138		struct drm_display_mode *adjusted_mode)
139{
140	if (!get_slave_funcs(encoder)->mode_fixup)
141		return true;
142
143	return get_slave_funcs(encoder)->mode_fixup(encoder, mode, adjusted_mode);
144}
145EXPORT_SYMBOL(drm_i2c_encoder_mode_fixup);
146
147void drm_i2c_encoder_prepare(struct drm_encoder *encoder)
148{
149	drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
150}
151EXPORT_SYMBOL(drm_i2c_encoder_prepare);
152
153void drm_i2c_encoder_commit(struct drm_encoder *encoder)
154{
155	drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
156}
157EXPORT_SYMBOL(drm_i2c_encoder_commit);
158
159void drm_i2c_encoder_mode_set(struct drm_encoder *encoder,
160		struct drm_display_mode *mode,
161		struct drm_display_mode *adjusted_mode)
162{
163	get_slave_funcs(encoder)->mode_set(encoder, mode, adjusted_mode);
164}
165EXPORT_SYMBOL(drm_i2c_encoder_mode_set);
166
167enum drm_connector_status drm_i2c_encoder_detect(struct drm_encoder *encoder,
168	    struct drm_connector *connector)
169{
170	return get_slave_funcs(encoder)->detect(encoder, connector);
171}
172EXPORT_SYMBOL(drm_i2c_encoder_detect);
173
174void drm_i2c_encoder_save(struct drm_encoder *encoder)
175{
176	get_slave_funcs(encoder)->save(encoder);
177}
178EXPORT_SYMBOL(drm_i2c_encoder_save);
179
180void drm_i2c_encoder_restore(struct drm_encoder *encoder)
181{
182	get_slave_funcs(encoder)->restore(encoder);
183}
184EXPORT_SYMBOL(drm_i2c_encoder_restore);
185