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 #if 0
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 */
53 int 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_device(adap, info);
66 if (!client) {
67 err = -ENOMEM;
68 goto fail;
69 }
70
71 if (!client->dev.driver) {
72 err = -ENODEV;
73 goto fail_unregister;
74 }
75
76 module = client->dev.driver->owner;
77 if (!try_module_get(module)) {
78 err = -ENODEV;
79 goto fail_unregister;
80 }
81
82 encoder->bus_priv = client;
83
84 encoder_drv = to_drm_i2c_encoder_driver(to_i2c_driver(client->dev.driver));
85
86 err = encoder_drv->encoder_init(client, dev, encoder);
87 if (err)
88 goto fail_unregister;
89
90 if (info->platform_data)
91 encoder->slave_funcs->set_config(&encoder->base,
92 info->platform_data);
93
94 return 0;
95
96 fail_unregister:
97 i2c_unregister_device(client);
98 module_put(module);
99 fail:
100 return err;
101 }
102 EXPORT_SYMBOL(drm_i2c_encoder_init);
103
104 /**
105 * drm_i2c_encoder_destroy - Unregister the I2C device backing an encoder
106 * @drm_encoder: Encoder to be unregistered.
107 *
108 * This should be called from the @destroy method of an I2C slave
109 * encoder driver once I2C access is no longer needed.
110 */
111 void drm_i2c_encoder_destroy(struct drm_encoder *drm_encoder)
112 {
113 struct drm_encoder_slave *encoder = to_encoder_slave(drm_encoder);
114 struct i2c_client *client = drm_i2c_encoder_get_client(drm_encoder);
115 struct module *module = client->dev.driver->owner;
116
117 i2c_unregister_device(client);
118 encoder->bus_priv = NULL;
119
120 module_put(module);
121 }
122 EXPORT_SYMBOL(drm_i2c_encoder_destroy);
123 #endif
124
125 /*
126 * Wrapper fxns which can be plugged in to drm_encoder_helper_funcs:
127 */
128
129 static inline const struct drm_encoder_slave_funcs *
get_slave_funcs(struct drm_encoder * enc)130 get_slave_funcs(struct drm_encoder *enc)
131 {
132 return to_encoder_slave(enc)->slave_funcs;
133 }
134
drm_i2c_encoder_dpms(struct drm_encoder * encoder,int mode)135 void drm_i2c_encoder_dpms(struct drm_encoder *encoder, int mode)
136 {
137 get_slave_funcs(encoder)->dpms(encoder, mode);
138 }
139 EXPORT_SYMBOL(drm_i2c_encoder_dpms);
140
drm_i2c_encoder_mode_fixup(struct drm_encoder * encoder,const struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)141 bool drm_i2c_encoder_mode_fixup(struct drm_encoder *encoder,
142 const struct drm_display_mode *mode,
143 struct drm_display_mode *adjusted_mode)
144 {
145 if (!get_slave_funcs(encoder)->mode_fixup)
146 return true;
147
148 return get_slave_funcs(encoder)->mode_fixup(encoder, mode, adjusted_mode);
149 }
150 EXPORT_SYMBOL(drm_i2c_encoder_mode_fixup);
151
drm_i2c_encoder_prepare(struct drm_encoder * encoder)152 void drm_i2c_encoder_prepare(struct drm_encoder *encoder)
153 {
154 drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
155 }
156 EXPORT_SYMBOL(drm_i2c_encoder_prepare);
157
drm_i2c_encoder_commit(struct drm_encoder * encoder)158 void drm_i2c_encoder_commit(struct drm_encoder *encoder)
159 {
160 drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
161 }
162 EXPORT_SYMBOL(drm_i2c_encoder_commit);
163
drm_i2c_encoder_mode_set(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)164 void drm_i2c_encoder_mode_set(struct drm_encoder *encoder,
165 struct drm_display_mode *mode,
166 struct drm_display_mode *adjusted_mode)
167 {
168 get_slave_funcs(encoder)->mode_set(encoder, mode, adjusted_mode);
169 }
170 EXPORT_SYMBOL(drm_i2c_encoder_mode_set);
171
drm_i2c_encoder_detect(struct drm_encoder * encoder,struct drm_connector * connector)172 enum drm_connector_status drm_i2c_encoder_detect(struct drm_encoder *encoder,
173 struct drm_connector *connector)
174 {
175 return get_slave_funcs(encoder)->detect(encoder, connector);
176 }
177 EXPORT_SYMBOL(drm_i2c_encoder_detect);
178
drm_i2c_encoder_save(struct drm_encoder * encoder)179 void drm_i2c_encoder_save(struct drm_encoder *encoder)
180 {
181 get_slave_funcs(encoder)->save(encoder);
182 }
183 EXPORT_SYMBOL(drm_i2c_encoder_save);
184
drm_i2c_encoder_restore(struct drm_encoder * encoder)185 void drm_i2c_encoder_restore(struct drm_encoder *encoder)
186 {
187 get_slave_funcs(encoder)->restore(encoder);
188 }
189 EXPORT_SYMBOL(drm_i2c_encoder_restore);
190