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 */
drm_i2c_encoder_init(struct drm_device * dev,struct drm_encoder_slave * encoder,struct i2c_adapter * adap,const struct i2c_board_info * info)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_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
91 fail_module_put:
92 module_put(module);
93 fail_unregister:
94 i2c_unregister_device(client);
95 return err;
96 }
97 EXPORT_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 */
drm_i2c_encoder_destroy(struct drm_encoder * drm_encoder)106 void 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 }
117 EXPORT_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
124 static inline const struct drm_encoder_slave_funcs *
get_slave_funcs(struct drm_encoder * enc)125 get_slave_funcs(struct drm_encoder *enc)
126 {
127 return to_encoder_slave(enc)->slave_funcs;
128 }
129
drm_i2c_encoder_dpms(struct drm_encoder * encoder,int mode)130 void drm_i2c_encoder_dpms(struct drm_encoder *encoder, int mode)
131 {
132 get_slave_funcs(encoder)->dpms(encoder, mode);
133 }
134 EXPORT_SYMBOL(drm_i2c_encoder_dpms);
135
drm_i2c_encoder_mode_fixup(struct drm_encoder * encoder,const struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)136 bool 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 }
145 EXPORT_SYMBOL(drm_i2c_encoder_mode_fixup);
146
drm_i2c_encoder_prepare(struct drm_encoder * encoder)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
drm_i2c_encoder_commit(struct drm_encoder * encoder)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
drm_i2c_encoder_mode_set(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)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
drm_i2c_encoder_detect(struct drm_encoder * encoder,struct drm_connector * connector)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
drm_i2c_encoder_save(struct drm_encoder * encoder)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
drm_i2c_encoder_restore(struct drm_encoder * encoder)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);
185