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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 obtaining6 * a copy of this software and associated documentation files (the7 * "Software"), to deal in the Software without restriction, including8 * without limitation the rights to use, copy, modify, merge, publish,9 * distribute, sublicense, and/or sell copies of the Software, and to10 * permit persons to whom the Software is furnished to do so, subject to11 * the following conditions:12 *13 * The above copyright notice and this permission notice (including the14 * next paragraph) shall be included in all copies or substantial15 * 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 OF19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.20 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.24 *25 */26 27#include <linux/module.h>28 29#include <drm/drm_encoder_slave.h>30 31/**32 * drm_i2c_encoder_init - Initialize an I2C slave encoder33 * @dev: DRM device.34 * @encoder: Encoder to be attached to the I2C device. You aren't35 * required to have called drm_encoder_init() before.36 * @adap: I2C adapter that will be used to communicate with37 * 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 its42 * driver is transparently loaded) and attach it to the specified43 * &drm_encoder_slave. The @slave_funcs field will be initialized with44 * the hooks provided by the slave driver.45 *46 * If @info.platform_data is non-NULL it will be used as the initial47 * 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 struct module *module = NULL;58 struct i2c_client *client;59 struct drm_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->bus_priv = client;77 78 encoder_drv = to_drm_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->slave_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}96EXPORT_SYMBOL(drm_i2c_encoder_init);97 98/**99 * drm_i2c_encoder_destroy - Unregister the I2C device backing an encoder100 * @drm_encoder: Encoder to be unregistered.101 *102 * This should be called from the @destroy method of an I2C slave103 * encoder driver once I2C access is no longer needed.104 */105void 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->dev.driver->owner;110 111 i2c_unregister_device(client);112 encoder->bus_priv = NULL;113 114 module_put(module);115}116EXPORT_SYMBOL(drm_i2c_encoder_destroy);117 118/*119 * Wrapper fxns which can be plugged in to drm_encoder_helper_funcs:120 */121 122static inline const struct drm_encoder_slave_funcs *123get_slave_funcs(struct drm_encoder *enc)124{125 return to_encoder_slave(enc)->slave_funcs;126}127 128void drm_i2c_encoder_dpms(struct drm_encoder *encoder, int mode)129{130 get_slave_funcs(encoder)->dpms(encoder, mode);131}132EXPORT_SYMBOL(drm_i2c_encoder_dpms);133 134bool drm_i2c_encoder_mode_fixup(struct drm_encoder *encoder,135 const struct drm_display_mode *mode,136 struct drm_display_mode *adjusted_mode)137{138 if (!get_slave_funcs(encoder)->mode_fixup)139 return true;140 141 return get_slave_funcs(encoder)->mode_fixup(encoder, mode, adjusted_mode);142}143EXPORT_SYMBOL(drm_i2c_encoder_mode_fixup);144 145void drm_i2c_encoder_prepare(struct drm_encoder *encoder)146{147 drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);148}149EXPORT_SYMBOL(drm_i2c_encoder_prepare);150 151void drm_i2c_encoder_commit(struct drm_encoder *encoder)152{153 drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_ON);154}155EXPORT_SYMBOL(drm_i2c_encoder_commit);156 157void drm_i2c_encoder_mode_set(struct drm_encoder *encoder,158 struct drm_display_mode *mode,159 struct drm_display_mode *adjusted_mode)160{161 get_slave_funcs(encoder)->mode_set(encoder, mode, adjusted_mode);162}163EXPORT_SYMBOL(drm_i2c_encoder_mode_set);164 165enum drm_connector_status drm_i2c_encoder_detect(struct drm_encoder *encoder,166 struct drm_connector *connector)167{168 return get_slave_funcs(encoder)->detect(encoder, connector);169}170EXPORT_SYMBOL(drm_i2c_encoder_detect);171 172void drm_i2c_encoder_save(struct drm_encoder *encoder)173{174 get_slave_funcs(encoder)->save(encoder);175}176EXPORT_SYMBOL(drm_i2c_encoder_save);177 178void drm_i2c_encoder_restore(struct drm_encoder *encoder)179{180 get_slave_funcs(encoder)->restore(encoder);181}182EXPORT_SYMBOL(drm_i2c_encoder_restore);183