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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 | * | |
44 | * Returns 0 on success or a negative errno on failure, in particular, | |
45 | * -ENODEV is returned when no matching driver is found. | |
46 | */ | |
47 | int drm_i2c_encoder_init(struct drm_device *dev, | |
48 | struct drm_encoder_slave *encoder, | |
49 | struct i2c_adapter *adap, | |
50 | const struct i2c_board_info *info) | |
51 | { | |
52 | char modalias[sizeof(I2C_MODULE_PREFIX) | |
53 | + I2C_NAME_SIZE]; | |
54 | struct module *module = NULL; | |
55 | struct i2c_client *client; | |
56 | struct drm_i2c_encoder_driver *encoder_drv; | |
57 | int err = 0; | |
58 | ||
59 | snprintf(modalias, sizeof(modalias), | |
60 | "%s%s", I2C_MODULE_PREFIX, info->type); | |
61 | request_module(modalias); | |
62 | ||
63 | client = i2c_new_device(adap, info); | |
64 | if (!client) { | |
65 | err = -ENOMEM; | |
66 | goto fail; | |
67 | } | |
68 | ||
69 | if (!client->driver) { | |
70 | err = -ENODEV; | |
71 | goto fail_unregister; | |
72 | } | |
73 | ||
74 | module = client->driver->driver.owner; | |
75 | if (!try_module_get(module)) { | |
76 | err = -ENODEV; | |
77 | goto fail_unregister; | |
78 | } | |
79 | ||
80 | encoder->bus_priv = client; | |
81 | ||
82 | encoder_drv = to_drm_i2c_encoder_driver(client->driver); | |
83 | ||
84 | err = encoder_drv->encoder_init(client, dev, encoder); | |
85 | if (err) | |
86 | goto fail_unregister; | |
87 | ||
88 | return 0; | |
89 | ||
90 | fail_unregister: | |
91 | i2c_unregister_device(client); | |
92 | module_put(module); | |
93 | fail: | |
94 | return err; | |
95 | } | |
96 | EXPORT_SYMBOL(drm_i2c_encoder_init); | |
97 | ||
98 | /** | |
99 | * drm_i2c_encoder_destroy - Unregister the I2C device backing an encoder | |
100 | * @drm_encoder: Encoder to be unregistered. | |
101 | * | |
102 | * This should be called from the @destroy method of an I2C slave | |
103 | * encoder driver once I2C access is no longer needed. | |
104 | */ | |
105 | void drm_i2c_encoder_destroy(struct drm_encoder *drm_encoder) | |
106 | { | |
107 | struct drm_encoder_slave *encoder = to_encoder_slave(drm_encoder); | |
108 | struct i2c_client *client = drm_i2c_encoder_get_client(drm_encoder); | |
109 | struct module *module = client->driver->driver.owner; | |
110 | ||
111 | i2c_unregister_device(client); | |
112 | encoder->bus_priv = NULL; | |
113 | ||
114 | module_put(module); | |
115 | } | |
116 | EXPORT_SYMBOL(drm_i2c_encoder_destroy); |