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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 "drm_encoder_slave.h"
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 * If @info->platform_data is non-NULL it will be used as the initial
45 * slave config.
46 *
47 * Returns 0 on success or a negative errno on failure, in particular,
48 * -ENODEV is returned when no matching driver is found.
49 */
50int 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
91 if (info->platform_data)
92 encoder->slave_funcs->set_config(&encoder->base,
93 info->platform_data);
94
95 return 0;
96
97fail_unregister:
98 i2c_unregister_device(client);
99 module_put(module);
100fail:
101 return err;
102}
103EXPORT_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 */
112void 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}
123EXPORT_SYMBOL(drm_i2c_encoder_destroy);
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_encoder_slave.h"
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 *
46 * If @info->platform_data is non-NULL it will be used as the initial
47 * slave config.
48 *
49 * Returns 0 on success or a negative errno on failure, in particular,
50 * -ENODEV is returned when no matching driver is found.
51 */
52int 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{
57 char modalias[sizeof(I2C_MODULE_PREFIX)
58 + I2C_NAME_SIZE];
59 struct module *module = NULL;
60 struct i2c_client *client;
61 struct drm_i2c_encoder_driver *encoder_drv;
62 int err = 0;
63
64 snprintf(modalias, sizeof(modalias),
65 "%s%s", I2C_MODULE_PREFIX, info->type);
66 request_module(modalias);
67
68 client = i2c_new_device(adap, info);
69 if (!client) {
70 err = -ENOMEM;
71 goto fail;
72 }
73
74 if (!client->driver) {
75 err = -ENODEV;
76 goto fail_unregister;
77 }
78
79 module = client->driver->driver.owner;
80 if (!try_module_get(module)) {
81 err = -ENODEV;
82 goto fail_unregister;
83 }
84
85 encoder->bus_priv = client;
86
87 encoder_drv = to_drm_i2c_encoder_driver(client->driver);
88
89 err = encoder_drv->encoder_init(client, dev, encoder);
90 if (err)
91 goto fail_unregister;
92
93 if (info->platform_data)
94 encoder->slave_funcs->set_config(&encoder->base,
95 info->platform_data);
96
97 return 0;
98
99fail_unregister:
100 i2c_unregister_device(client);
101 module_put(module);
102fail:
103 return err;
104}
105EXPORT_SYMBOL(drm_i2c_encoder_init);
106
107/**
108 * drm_i2c_encoder_destroy - Unregister the I2C device backing an encoder
109 * @drm_encoder: Encoder to be unregistered.
110 *
111 * This should be called from the @destroy method of an I2C slave
112 * encoder driver once I2C access is no longer needed.
113 */
114void drm_i2c_encoder_destroy(struct drm_encoder *drm_encoder)
115{
116 struct drm_encoder_slave *encoder = to_encoder_slave(drm_encoder);
117 struct i2c_client *client = drm_i2c_encoder_get_client(drm_encoder);
118 struct module *module = client->driver->driver.owner;
119
120 i2c_unregister_device(client);
121 encoder->bus_priv = NULL;
122
123 module_put(module);
124}
125EXPORT_SYMBOL(drm_i2c_encoder_destroy);