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2066facc FJ |
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 | ||
e0cd3608 PG |
27 | #include <linux/module.h> |
28 | ||
760285e7 | 29 | #include <drm/drm_encoder_slave.h> |
2066facc FJ |
30 | |
31 | /** | |
32 | * drm_i2c_encoder_init - Initialize an I2C slave encoder | |
33 | * @dev: DRM device. | |
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 | |
37 | * the device. | |
38 | * @info: Information that will be used to create the I2C device. | |
39 | * Required fields are @addr and @type. | |
40 | * | |
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. | |
45 | * | |
a1e09b62 FJ |
46 | * If @info->platform_data is non-NULL it will be used as the initial |
47 | * slave config. | |
48 | * | |
2066facc FJ |
49 | * Returns 0 on success or a negative errno on failure, in particular, |
50 | * -ENODEV is returned when no matching driver is found. | |
51 | */ | |
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) | |
56 | { | |
2066facc FJ |
57 | struct module *module = NULL; |
58 | struct i2c_client *client; | |
59 | struct drm_i2c_encoder_driver *encoder_drv; | |
60 | int err = 0; | |
61 | ||
d1fd3ddc | 62 | request_module("%s%s", I2C_MODULE_PREFIX, info->type); |
2066facc FJ |
63 | |
64 | client = i2c_new_device(adap, info); | |
65 | if (!client) { | |
66 | err = -ENOMEM; | |
67 | goto fail; | |
68 | } | |
69 | ||
3ee81b7a | 70 | if (!client->dev.driver) { |
2066facc FJ |
71 | err = -ENODEV; |
72 | goto fail_unregister; | |
73 | } | |
74 | ||
3ee81b7a | 75 | module = client->dev.driver->owner; |
2066facc FJ |
76 | if (!try_module_get(module)) { |
77 | err = -ENODEV; | |
78 | goto fail_unregister; | |
79 | } | |
80 | ||
81 | encoder->bus_priv = client; | |
82 | ||
3ee81b7a | 83 | encoder_drv = to_drm_i2c_encoder_driver(to_i2c_driver(client->dev.driver)); |
2066facc FJ |
84 | |
85 | err = encoder_drv->encoder_init(client, dev, encoder); | |
86 | if (err) | |
87 | goto fail_unregister; | |
88 | ||
a1e09b62 FJ |
89 | if (info->platform_data) |
90 | encoder->slave_funcs->set_config(&encoder->base, | |
91 | info->platform_data); | |
92 | ||
2066facc FJ |
93 | return 0; |
94 | ||
95 | fail_unregister: | |
96 | i2c_unregister_device(client); | |
97 | module_put(module); | |
98 | fail: | |
99 | return err; | |
100 | } | |
101 | EXPORT_SYMBOL(drm_i2c_encoder_init); | |
102 | ||
103 | /** | |
104 | * drm_i2c_encoder_destroy - Unregister the I2C device backing an encoder | |
105 | * @drm_encoder: Encoder to be unregistered. | |
106 | * | |
107 | * This should be called from the @destroy method of an I2C slave | |
108 | * encoder driver once I2C access is no longer needed. | |
109 | */ | |
110 | void drm_i2c_encoder_destroy(struct drm_encoder *drm_encoder) | |
111 | { | |
112 | struct drm_encoder_slave *encoder = to_encoder_slave(drm_encoder); | |
113 | struct i2c_client *client = drm_i2c_encoder_get_client(drm_encoder); | |
3ee81b7a | 114 | struct module *module = client->dev.driver->owner; |
2066facc FJ |
115 | |
116 | i2c_unregister_device(client); | |
117 | encoder->bus_priv = NULL; | |
118 | ||
119 | module_put(module); | |
120 | } | |
121 | EXPORT_SYMBOL(drm_i2c_encoder_destroy); | |
a7c47d6d RC |
122 | |
123 | /* | |
124 | * Wrapper fxns which can be plugged in to drm_encoder_helper_funcs: | |
125 | */ | |
126 | ||
16c3719c | 127 | static inline const struct drm_encoder_slave_funcs * |
a7c47d6d RC |
128 | get_slave_funcs(struct drm_encoder *enc) |
129 | { | |
130 | return to_encoder_slave(enc)->slave_funcs; | |
131 | } | |
132 | ||
133 | void drm_i2c_encoder_dpms(struct drm_encoder *encoder, int mode) | |
134 | { | |
135 | get_slave_funcs(encoder)->dpms(encoder, mode); | |
136 | } | |
137 | EXPORT_SYMBOL(drm_i2c_encoder_dpms); | |
138 | ||
139 | bool drm_i2c_encoder_mode_fixup(struct drm_encoder *encoder, | |
140 | const struct drm_display_mode *mode, | |
141 | struct drm_display_mode *adjusted_mode) | |
142 | { | |
143 | return get_slave_funcs(encoder)->mode_fixup(encoder, mode, adjusted_mode); | |
144 | } | |
145 | EXPORT_SYMBOL(drm_i2c_encoder_mode_fixup); | |
146 | ||
147 | void drm_i2c_encoder_prepare(struct drm_encoder *encoder) | |
148 | { | |
149 | drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_OFF); | |
150 | } | |
151 | EXPORT_SYMBOL(drm_i2c_encoder_prepare); | |
152 | ||
153 | void drm_i2c_encoder_commit(struct drm_encoder *encoder) | |
154 | { | |
155 | drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_ON); | |
156 | } | |
157 | EXPORT_SYMBOL(drm_i2c_encoder_commit); | |
158 | ||
159 | void 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 | } | |
165 | EXPORT_SYMBOL(drm_i2c_encoder_mode_set); | |
166 | ||
167 | enum 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 | } | |
172 | EXPORT_SYMBOL(drm_i2c_encoder_detect); | |
173 | ||
174 | void drm_i2c_encoder_save(struct drm_encoder *encoder) | |
175 | { | |
176 | get_slave_funcs(encoder)->save(encoder); | |
177 | } | |
178 | EXPORT_SYMBOL(drm_i2c_encoder_save); | |
179 | ||
180 | void drm_i2c_encoder_restore(struct drm_encoder *encoder) | |
181 | { | |
182 | get_slave_funcs(encoder)->restore(encoder); | |
183 | } | |
184 | EXPORT_SYMBOL(drm_i2c_encoder_restore); |