x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / gpu / drm / drm_encoder_slave.c
blob0cfb60f5476655edc097ca71c648d11544f3357e
1 /*
2 * Copyright (C) 2009 Francisco Jerez.
3 * All Rights Reserved.
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:
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.
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.
27 #include <linux/module.h>
29 #include <drm/drm_encoder_slave.h>
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.
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.
46 * If @info->platform_data is non-NULL it will be used as the initial
47 * slave config.
49 * Returns 0 on success or a negative errno on failure, in particular,
50 * -ENODEV is returned when no matching driver is found.
52 int 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)
57 struct module *module = NULL;
58 struct i2c_client *client;
59 struct drm_i2c_encoder_driver *encoder_drv;
60 int err = 0;
62 request_module("%s%s", I2C_MODULE_PREFIX, info->type);
64 client = i2c_new_device(adap, info);
65 if (!client) {
66 err = -ENOMEM;
67 goto fail;
70 if (!client->driver) {
71 err = -ENODEV;
72 goto fail_unregister;
75 module = client->driver->driver.owner;
76 if (!try_module_get(module)) {
77 err = -ENODEV;
78 goto fail_unregister;
81 encoder->bus_priv = client;
83 encoder_drv = to_drm_i2c_encoder_driver(client->driver);
85 err = encoder_drv->encoder_init(client, dev, encoder);
86 if (err)
87 goto fail_unregister;
89 if (info->platform_data)
90 encoder->slave_funcs->set_config(&encoder->base,
91 info->platform_data);
93 return 0;
95 fail_unregister:
96 i2c_unregister_device(client);
97 module_put(module);
98 fail:
99 return err;
101 EXPORT_SYMBOL(drm_i2c_encoder_init);
104 * drm_i2c_encoder_destroy - Unregister the I2C device backing an encoder
105 * @drm_encoder: Encoder to be unregistered.
107 * This should be called from the @destroy method of an I2C slave
108 * encoder driver once I2C access is no longer needed.
110 void drm_i2c_encoder_destroy(struct drm_encoder *drm_encoder)
112 struct drm_encoder_slave *encoder = to_encoder_slave(drm_encoder);
113 struct i2c_client *client = drm_i2c_encoder_get_client(drm_encoder);
114 struct module *module = client->driver->driver.owner;
116 i2c_unregister_device(client);
117 encoder->bus_priv = NULL;
119 module_put(module);
121 EXPORT_SYMBOL(drm_i2c_encoder_destroy);
124 * Wrapper fxns which can be plugged in to drm_encoder_helper_funcs:
127 static inline struct drm_encoder_slave_funcs *
128 get_slave_funcs(struct drm_encoder *enc)
130 return to_encoder_slave(enc)->slave_funcs;
133 void drm_i2c_encoder_dpms(struct drm_encoder *encoder, int mode)
135 get_slave_funcs(encoder)->dpms(encoder, mode);
137 EXPORT_SYMBOL(drm_i2c_encoder_dpms);
139 bool drm_i2c_encoder_mode_fixup(struct drm_encoder *encoder,
140 const struct drm_display_mode *mode,
141 struct drm_display_mode *adjusted_mode)
143 return get_slave_funcs(encoder)->mode_fixup(encoder, mode, adjusted_mode);
145 EXPORT_SYMBOL(drm_i2c_encoder_mode_fixup);
147 void drm_i2c_encoder_prepare(struct drm_encoder *encoder)
149 drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
151 EXPORT_SYMBOL(drm_i2c_encoder_prepare);
153 void drm_i2c_encoder_commit(struct drm_encoder *encoder)
155 drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
157 EXPORT_SYMBOL(drm_i2c_encoder_commit);
159 void drm_i2c_encoder_mode_set(struct drm_encoder *encoder,
160 struct drm_display_mode *mode,
161 struct drm_display_mode *adjusted_mode)
163 get_slave_funcs(encoder)->mode_set(encoder, mode, adjusted_mode);
165 EXPORT_SYMBOL(drm_i2c_encoder_mode_set);
167 enum drm_connector_status drm_i2c_encoder_detect(struct drm_encoder *encoder,
168 struct drm_connector *connector)
170 return get_slave_funcs(encoder)->detect(encoder, connector);
172 EXPORT_SYMBOL(drm_i2c_encoder_detect);
174 void drm_i2c_encoder_save(struct drm_encoder *encoder)
176 get_slave_funcs(encoder)->save(encoder);
178 EXPORT_SYMBOL(drm_i2c_encoder_save);
180 void drm_i2c_encoder_restore(struct drm_encoder *encoder)
182 get_slave_funcs(encoder)->restore(encoder);
184 EXPORT_SYMBOL(drm_i2c_encoder_restore);