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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 | ||
cfcf4738 | 27 | #include "drm_encoder_slave.h" |
2066facc FJ |
28 | |
29 | /** | |
30 | * drm_i2c_encoder_init - Initialize an I2C slave encoder | |
31 | * @dev: DRM device. | |
32 | * @encoder: Encoder to be attached to the I2C device. You aren't | |
33 | * required to have called drm_encoder_init() before. | |
34 | * @adap: I2C adapter that will be used to communicate with | |
35 | * the device. | |
36 | * @info: Information that will be used to create the I2C device. | |
37 | * Required fields are @addr and @type. | |
38 | * | |
39 | * Create an I2C device on the specified bus (the module containing its | |
40 | * driver is transparently loaded) and attach it to the specified | |
41 | * &drm_encoder_slave. The @slave_funcs field will be initialized with | |
42 | * the hooks provided by the slave driver. | |
43 | * | |
a1e09b62 FJ |
44 | * If @info->platform_data is non-NULL it will be used as the initial |
45 | * slave config. | |
46 | * | |
2066facc FJ |
47 | * Returns 0 on success or a negative errno on failure, in particular, |
48 | * -ENODEV is returned when no matching driver is found. | |
49 | */ | |
50 | int drm_i2c_encoder_init(struct drm_device *dev, | |
51 | struct drm_encoder_slave *encoder, | |
52 | struct i2c_adapter *adap, | |
53 | const struct i2c_board_info *info) | |
54 | { | |
55 | char modalias[sizeof(I2C_MODULE_PREFIX) | |
56 | + I2C_NAME_SIZE]; | |
57 | struct module *module = NULL; | |
58 | struct i2c_client *client; | |
59 | struct drm_i2c_encoder_driver *encoder_drv; | |
60 | int err = 0; | |
61 | ||
62 | snprintf(modalias, sizeof(modalias), | |
63 | "%s%s", I2C_MODULE_PREFIX, info->type); | |
64 | request_module(modalias); | |
65 | ||
66 | client = i2c_new_device(adap, info); | |
67 | if (!client) { | |
68 | err = -ENOMEM; | |
69 | goto fail; | |
70 | } | |
71 | ||
72 | if (!client->driver) { | |
73 | err = -ENODEV; | |
74 | goto fail_unregister; | |
75 | } | |
76 | ||
77 | module = client->driver->driver.owner; | |
78 | if (!try_module_get(module)) { | |
79 | err = -ENODEV; | |
80 | goto fail_unregister; | |
81 | } | |
82 | ||
83 | encoder->bus_priv = client; | |
84 | ||
85 | encoder_drv = to_drm_i2c_encoder_driver(client->driver); | |
86 | ||
87 | err = encoder_drv->encoder_init(client, dev, encoder); | |
88 | if (err) | |
89 | goto fail_unregister; | |
90 | ||
a1e09b62 FJ |
91 | if (info->platform_data) |
92 | encoder->slave_funcs->set_config(&encoder->base, | |
93 | info->platform_data); | |
94 | ||
2066facc FJ |
95 | return 0; |
96 | ||
97 | fail_unregister: | |
98 | i2c_unregister_device(client); | |
99 | module_put(module); | |
100 | fail: | |
101 | return err; | |
102 | } | |
103 | EXPORT_SYMBOL(drm_i2c_encoder_init); | |
104 | ||
105 | /** | |
106 | * drm_i2c_encoder_destroy - Unregister the I2C device backing an encoder | |
107 | * @drm_encoder: Encoder to be unregistered. | |
108 | * | |
109 | * This should be called from the @destroy method of an I2C slave | |
110 | * encoder driver once I2C access is no longer needed. | |
111 | */ | |
112 | void drm_i2c_encoder_destroy(struct drm_encoder *drm_encoder) | |
113 | { | |
114 | struct drm_encoder_slave *encoder = to_encoder_slave(drm_encoder); | |
115 | struct i2c_client *client = drm_i2c_encoder_get_client(drm_encoder); | |
116 | struct module *module = client->driver->driver.owner; | |
117 | ||
118 | i2c_unregister_device(client); | |
119 | encoder->bus_priv = NULL; | |
120 | ||
121 | module_put(module); | |
122 | } | |
123 | EXPORT_SYMBOL(drm_i2c_encoder_destroy); |