summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/drm_encoder_slave.c
blob: e8629076de32161a82d3103b772ce198f5c4e59e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
/*
 * Copyright (C) 2009 Francisco Jerez.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#include <linux/module.h>

#include <drm/drm_encoder_slave.h>

/**
 * drm_i2c_encoder_init - Initialize an I2C slave encoder
 * @dev:	DRM device.
 * @encoder:    Encoder to be attached to the I2C device. You aren't
 *		required to have called drm_encoder_init() before.
 * @adap:	I2C adapter that will be used to communicate with
 *		the device.
 * @info:	Information that will be used to create the I2C device.
 *		Required fields are @addr and @type.
 *
 * Create an I2C device on the specified bus (the module containing its
 * driver is transparently loaded) and attach it to the specified
 * &drm_encoder_slave. The @slave_funcs field will be initialized with
 * the hooks provided by the slave driver.
 *
 * If @info->platform_data is non-NULL it will be used as the initial
 * slave config.
 *
 * Returns 0 on success or a negative errno on failure, in particular,
 * -ENODEV is returned when no matching driver is found.
 */
int drm_i2c_encoder_init(struct drm_device *dev,
			 struct drm_encoder_slave *encoder,
			 struct i2c_adapter *adap,
			 const struct i2c_board_info *info)
{
	struct module *module = NULL;
	struct i2c_client *client;
	struct drm_i2c_encoder_driver *encoder_drv;
	int err = 0;

	request_module("%s%s", I2C_MODULE_PREFIX, info->type);

	client = i2c_new_device(adap, info);
	if (!client) {
		err = -ENOMEM;
		goto fail;
	}

	if (!client->dev.driver) {
		err = -ENODEV;
		goto fail_unregister;
	}

	module = client->dev.driver->owner;
	if (!try_module_get(module)) {
		err = -ENODEV;
		goto fail_unregister;
	}

	encoder->bus_priv = client;

	encoder_drv = to_drm_i2c_encoder_driver(to_i2c_driver(client->dev.driver));

	err = encoder_drv->encoder_init(client, dev, encoder);
	if (err)
		goto fail_unregister;

	if (info->platform_data)
		encoder->slave_funcs->set_config(&encoder->base,
						 info->platform_data);

	return 0;

fail_unregister:
	i2c_unregister_device(client);
	module_put(module);
fail:
	return err;
}
EXPORT_SYMBOL(drm_i2c_encoder_init);

/**
 * drm_i2c_encoder_destroy - Unregister the I2C device backing an encoder
 * @drm_encoder:	Encoder to be unregistered.
 *
 * This should be called from the @destroy method of an I2C slave
 * encoder driver once I2C access is no longer needed.
 */
void drm_i2c_encoder_destroy(struct drm_encoder *drm_encoder)
{
	struct drm_encoder_slave *encoder = to_encoder_slave(drm_encoder);
	struct i2c_client *client = drm_i2c_encoder_get_client(drm_encoder);
	struct module *module = client->dev.driver->owner;

	i2c_unregister_device(client);
	encoder->bus_priv = NULL;

	module_put(module);
}
EXPORT_SYMBOL(drm_i2c_encoder_destroy);

/*
 * Wrapper fxns which can be plugged in to drm_encoder_helper_funcs:
 */

static inline const struct drm_encoder_slave_funcs *
get_slave_funcs(struct drm_encoder *enc)
{
	return to_encoder_slave(enc)->slave_funcs;
}

void drm_i2c_encoder_dpms(struct drm_encoder *encoder, int mode)
{
	get_slave_funcs(encoder)->dpms(encoder, mode);
}
EXPORT_SYMBOL(drm_i2c_encoder_dpms);

bool drm_i2c_encoder_mode_fixup(struct drm_encoder *encoder,
		const struct drm_display_mode *mode,
		struct drm_display_mode *adjusted_mode)
{
	return get_slave_funcs(encoder)->mode_fixup(encoder, mode, adjusted_mode);
}
EXPORT_SYMBOL(drm_i2c_encoder_mode_fixup);

void drm_i2c_encoder_prepare(struct drm_encoder *encoder)
{
	drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
}
EXPORT_SYMBOL(drm_i2c_encoder_prepare);

void drm_i2c_encoder_commit(struct drm_encoder *encoder)
{
	drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
}
EXPORT_SYMBOL(drm_i2c_encoder_commit);

void drm_i2c_encoder_mode_set(struct drm_encoder *encoder,
		struct drm_display_mode *mode,
		struct drm_display_mode *adjusted_mode)
{
	get_slave_funcs(encoder)->mode_set(encoder, mode, adjusted_mode);
}
EXPORT_SYMBOL(drm_i2c_encoder_mode_set);

enum drm_connector_status drm_i2c_encoder_detect(struct drm_encoder *encoder,
	    struct drm_connector *connector)
{
	return get_slave_funcs(encoder)->detect(encoder, connector);
}
EXPORT_SYMBOL(drm_i2c_encoder_detect);

void drm_i2c_encoder_save(struct drm_encoder *encoder)
{
	get_slave_funcs(encoder)->save(encoder);
}
EXPORT_SYMBOL(drm_i2c_encoder_save);

void drm_i2c_encoder_restore(struct drm_encoder *encoder)
{
	get_slave_funcs(encoder)->restore(encoder);
}
EXPORT_SYMBOL(drm_i2c_encoder_restore);