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/drm_encoder_slave.h> 30 31 #if 0 32 /** 33 * drm_i2c_encoder_init - Initialize an I2C slave encoder 34 * @dev: DRM device. 35 * @encoder: Encoder to be attached to the I2C device. You aren't 36 * required to have called drm_encoder_init() before. 37 * @adap: I2C adapter that will be used to communicate with 38 * the device. 39 * @info: Information that will be used to create the I2C device. 40 * Required fields are @addr and @type. 41 * 42 * Create an I2C device on the specified bus (the module containing its 43 * driver is transparently loaded) and attach it to the specified 44 * &drm_encoder_slave. The @slave_funcs field will be initialized with 45 * the hooks provided by the slave driver. 46 * 47 * If @info->platform_data is non-NULL it will be used as the initial 48 * slave config. 49 * 50 * Returns 0 on success or a negative errno on failure, in particular, 51 * -ENODEV is returned when no matching driver is found. 52 */ 53 int drm_i2c_encoder_init(struct drm_device *dev, 54 struct drm_encoder_slave *encoder, 55 struct i2c_adapter *adap, 56 const struct i2c_board_info *info) 57 { 58 struct module *module = NULL; 59 struct i2c_client *client; 60 struct drm_i2c_encoder_driver *encoder_drv; 61 int err = 0; 62 63 request_module("%s%s", I2C_MODULE_PREFIX, info->type); 64 65 client = i2c_new_device(adap, info); 66 if (!client) { 67 err = -ENOMEM; 68 goto fail; 69 } 70 71 if (!client->dev.driver) { 72 err = -ENODEV; 73 goto fail_unregister; 74 } 75 76 module = client->dev.driver->owner; 77 if (!try_module_get(module)) { 78 err = -ENODEV; 79 goto fail_unregister; 80 } 81 82 encoder->bus_priv = client; 83 84 encoder_drv = to_drm_i2c_encoder_driver(to_i2c_driver(client->dev.driver)); 85 86 err = encoder_drv->encoder_init(client, dev, encoder); 87 if (err) 88 goto fail_unregister; 89 90 if (info->platform_data) 91 encoder->slave_funcs->set_config(&encoder->base, 92 info->platform_data); 93 94 return 0; 95 96 fail_unregister: 97 i2c_unregister_device(client); 98 module_put(module); 99 fail: 100 return err; 101 } 102 EXPORT_SYMBOL(drm_i2c_encoder_init); 103 104 /** 105 * drm_i2c_encoder_destroy - Unregister the I2C device backing an encoder 106 * @drm_encoder: Encoder to be unregistered. 107 * 108 * This should be called from the @destroy method of an I2C slave 109 * encoder driver once I2C access is no longer needed. 110 */ 111 void drm_i2c_encoder_destroy(struct drm_encoder *drm_encoder) 112 { 113 struct drm_encoder_slave *encoder = to_encoder_slave(drm_encoder); 114 struct i2c_client *client = drm_i2c_encoder_get_client(drm_encoder); 115 struct module *module = client->dev.driver->owner; 116 117 i2c_unregister_device(client); 118 encoder->bus_priv = NULL; 119 120 module_put(module); 121 } 122 EXPORT_SYMBOL(drm_i2c_encoder_destroy); 123 #endif 124 125 /* 126 * Wrapper fxns which can be plugged in to drm_encoder_helper_funcs: 127 */ 128 129 static inline const struct drm_encoder_slave_funcs * 130 get_slave_funcs(struct drm_encoder *enc) 131 { 132 return to_encoder_slave(enc)->slave_funcs; 133 } 134 135 void drm_i2c_encoder_dpms(struct drm_encoder *encoder, int mode) 136 { 137 get_slave_funcs(encoder)->dpms(encoder, mode); 138 } 139 EXPORT_SYMBOL(drm_i2c_encoder_dpms); 140 141 bool drm_i2c_encoder_mode_fixup(struct drm_encoder *encoder, 142 const struct drm_display_mode *mode, 143 struct drm_display_mode *adjusted_mode) 144 { 145 if (!get_slave_funcs(encoder)->mode_fixup) 146 return true; 147 148 return get_slave_funcs(encoder)->mode_fixup(encoder, mode, adjusted_mode); 149 } 150 EXPORT_SYMBOL(drm_i2c_encoder_mode_fixup); 151 152 void drm_i2c_encoder_prepare(struct drm_encoder *encoder) 153 { 154 drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_OFF); 155 } 156 EXPORT_SYMBOL(drm_i2c_encoder_prepare); 157 158 void drm_i2c_encoder_commit(struct drm_encoder *encoder) 159 { 160 drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_ON); 161 } 162 EXPORT_SYMBOL(drm_i2c_encoder_commit); 163 164 void drm_i2c_encoder_mode_set(struct drm_encoder *encoder, 165 struct drm_display_mode *mode, 166 struct drm_display_mode *adjusted_mode) 167 { 168 get_slave_funcs(encoder)->mode_set(encoder, mode, adjusted_mode); 169 } 170 EXPORT_SYMBOL(drm_i2c_encoder_mode_set); 171 172 enum drm_connector_status drm_i2c_encoder_detect(struct drm_encoder *encoder, 173 struct drm_connector *connector) 174 { 175 return get_slave_funcs(encoder)->detect(encoder, connector); 176 } 177 EXPORT_SYMBOL(drm_i2c_encoder_detect); 178 179 void drm_i2c_encoder_save(struct drm_encoder *encoder) 180 { 181 get_slave_funcs(encoder)->save(encoder); 182 } 183 EXPORT_SYMBOL(drm_i2c_encoder_save); 184 185 void drm_i2c_encoder_restore(struct drm_encoder *encoder) 186 { 187 get_slave_funcs(encoder)->restore(encoder); 188 } 189 EXPORT_SYMBOL(drm_i2c_encoder_restore); 190