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 */ 52 int 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 90 fail_module_put: 91 module_put(module); 92 fail_unregister: 93 i2c_unregister_device(client); 94 return err; 95 } 96 97 /** 98 * nouveau_i2c_encoder_destroy - Unregister the I2C device backing an encoder 99 * @drm_encoder: Encoder to be unregistered. 100 * 101 * This should be called from the @destroy method of an I2C slave 102 * encoder driver once I2C access is no longer needed. 103 */ 104 void nouveau_i2c_encoder_destroy(struct drm_encoder *drm_encoder) 105 { 106 struct nouveau_i2c_encoder *encoder = to_encoder_i2c(drm_encoder); 107 struct i2c_client *client = nouveau_i2c_encoder_get_client(drm_encoder); 108 struct module *module = client->dev.driver->owner; 109 110 i2c_unregister_device(client); 111 encoder->i2c_client = NULL; 112 113 module_put(module); 114 } 115 EXPORT_SYMBOL(nouveau_i2c_encoder_destroy); 116 117 /* 118 * Wrapper fxns which can be plugged in to drm_encoder_helper_funcs: 119 */ 120 121 bool nouveau_i2c_encoder_mode_fixup(struct drm_encoder *encoder, 122 const struct drm_display_mode *mode, 123 struct drm_display_mode *adjusted_mode) 124 { 125 if (!get_encoder_i2c_funcs(encoder)->mode_fixup) 126 return true; 127 128 return get_encoder_i2c_funcs(encoder)->mode_fixup(encoder, mode, adjusted_mode); 129 } 130 131 enum drm_connector_status nouveau_i2c_encoder_detect(struct drm_encoder *encoder, 132 struct drm_connector *connector) 133 { 134 return get_encoder_i2c_funcs(encoder)->detect(encoder, connector); 135 } 136 137 void nouveau_i2c_encoder_save(struct drm_encoder *encoder) 138 { 139 get_encoder_i2c_funcs(encoder)->save(encoder); 140 } 141 142 void nouveau_i2c_encoder_restore(struct drm_encoder *encoder) 143 { 144 get_encoder_i2c_funcs(encoder)->restore(encoder); 145 } 146