nouveau_i2c_encoder.c

  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 <dispnv04/i2c/encoder_i2c.h>
 30
 31/**
 32 * nouveau_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 * &nouveau_i2c_encoder. The @encoder_i2c_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 nouveau_i2c_encoder_init(struct drm_device *dev,
 53			     struct nouveau_i2c_encoder *encoder,
 54			     struct i2c_adapter *adap,
 55			     const struct i2c_board_info *info)
 56{
 57	struct module *module = NULL;
 58	struct i2c_client *client;
 59	struct nouveau_i2c_encoder_driver *encoder_drv;
 60	int err = 0;
 61
 62	request_module("%s%s", I2C_MODULE_PREFIX, info->type);
 63
 64	client = i2c_new_client_device(adap, info);
 65	if (!i2c_client_has_driver(client)) {
 66		err = -ENODEV;
 67		goto fail_unregister;
 68	}
 69
 70	module = client->dev.driver->owner;
 71	if (!try_module_get(module)) {
 72		err = -ENODEV;
 73		goto fail_unregister;
 74	}
 75
 76	encoder->i2c_client = client;
 77
 78	encoder_drv = to_nouveau_i2c_encoder_driver(to_i2c_driver(client->dev.driver));
 79
 80	err = encoder_drv->encoder_init(client, dev, encoder);
 81	if (err)
 82		goto fail_module_put;
 83
 84	if (info->platform_data)
 85		encoder->encoder_i2c_funcs->set_config(&encoder->base,
 86						 info->platform_data);
 87
 88	return 0;
 89
 90fail_module_put:
 91	module_put(module);
 92fail_unregister:
 93	i2c_unregister_device(client);
 94	return err;
 95}
 96
 97/*
 98 * Wrapper fxns which can be plugged in to drm_encoder_helper_funcs:
 99 */
100
101bool nouveau_i2c_encoder_mode_fixup(struct drm_encoder *encoder,
102				    const struct drm_display_mode *mode,
103				    struct drm_display_mode *adjusted_mode)
104{
105	if (!get_encoder_i2c_funcs(encoder)->mode_fixup)
106		return true;
107
108	return get_encoder_i2c_funcs(encoder)->mode_fixup(encoder, mode, adjusted_mode);
109}
110
111enum drm_connector_status nouveau_i2c_encoder_detect(struct drm_encoder *encoder,
112						     struct drm_connector *connector)
113{
114	return get_encoder_i2c_funcs(encoder)->detect(encoder, connector);
115}
116
117void nouveau_i2c_encoder_save(struct drm_encoder *encoder)
118{
119	get_encoder_i2c_funcs(encoder)->save(encoder);
120}
121
122void nouveau_i2c_encoder_restore(struct drm_encoder *encoder)
123{
124	get_encoder_i2c_funcs(encoder)->restore(encoder);
125}