diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/dispnv04/nouveau_i2c_encoder.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/dispnv04/nouveau_i2c_encoder.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/dispnv04/nouveau_i2c_encoder.c b/drivers/gpu/drm/nouveau/dispnv04/nouveau_i2c_encoder.c new file mode 100644 index 000000000000..e2bf99c43336 --- /dev/null +++ b/drivers/gpu/drm/nouveau/dispnv04/nouveau_i2c_encoder.c @@ -0,0 +1,145 @@ +/* + * Copyright (C) 2009 Francisco Jerez. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial + * portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + */ + +#include <linux/module.h> + +#include <dispnv04/i2c/encoder_i2c.h> + +/** + * nouveau_i2c_encoder_init - Initialize an I2C slave encoder + * @dev: DRM device. + * @encoder: Encoder to be attached to the I2C device. You aren't + * required to have called drm_encoder_init() before. + * @adap: I2C adapter that will be used to communicate with + * the device. + * @info: Information that will be used to create the I2C device. + * Required fields are @addr and @type. + * + * Create an I2C device on the specified bus (the module containing its + * driver is transparently loaded) and attach it to the specified + * &nouveau_i2c_encoder. The @encoder_i2c_funcs field will be initialized with + * the hooks provided by the slave driver. + * + * If @info.platform_data is non-NULL it will be used as the initial + * slave config. + * + * Returns 0 on success or a negative errno on failure, in particular, + * -ENODEV is returned when no matching driver is found. + */ +int nouveau_i2c_encoder_init(struct drm_device *dev, + struct nouveau_i2c_encoder *encoder, + struct i2c_adapter *adap, + const struct i2c_board_info *info) +{ + struct module *module = NULL; + struct i2c_client *client; + struct nouveau_i2c_encoder_driver *encoder_drv; + int err = 0; + + request_module("%s%s", I2C_MODULE_PREFIX, info->type); + + client = i2c_new_client_device(adap, info); + if (!i2c_client_has_driver(client)) { + err = -ENODEV; + goto fail_unregister; + } + + module = client->dev.driver->owner; + if (!try_module_get(module)) { + err = -ENODEV; + goto fail_unregister; + } + + encoder->i2c_client = client; + + encoder_drv = to_nouveau_i2c_encoder_driver(to_i2c_driver(client->dev.driver)); + + err = encoder_drv->encoder_init(client, dev, encoder); + if (err) + goto fail_module_put; + + if (info->platform_data) + encoder->encoder_i2c_funcs->set_config(&encoder->base, + info->platform_data); + + return 0; + +fail_module_put: + module_put(module); +fail_unregister: + i2c_unregister_device(client); + return err; +} + +/** + * nouveau_i2c_encoder_destroy - Unregister the I2C device backing an encoder + * @drm_encoder: Encoder to be unregistered. + * + * This should be called from the @destroy method of an I2C slave + * encoder driver once I2C access is no longer needed. + */ +void nouveau_i2c_encoder_destroy(struct drm_encoder *drm_encoder) +{ + struct nouveau_i2c_encoder *encoder = to_encoder_i2c(drm_encoder); + struct i2c_client *client = nouveau_i2c_encoder_get_client(drm_encoder); + struct module *module = client->dev.driver->owner; + + i2c_unregister_device(client); + encoder->i2c_client = NULL; + + module_put(module); +} +EXPORT_SYMBOL(nouveau_i2c_encoder_destroy); + +/* + * Wrapper fxns which can be plugged in to drm_encoder_helper_funcs: + */ + +bool nouveau_i2c_encoder_mode_fixup(struct drm_encoder *encoder, + const struct drm_display_mode *mode, + struct drm_display_mode *adjusted_mode) +{ + if (!get_encoder_i2c_funcs(encoder)->mode_fixup) + return true; + + return get_encoder_i2c_funcs(encoder)->mode_fixup(encoder, mode, adjusted_mode); +} + +enum drm_connector_status nouveau_i2c_encoder_detect(struct drm_encoder *encoder, + struct drm_connector *connector) +{ + return get_encoder_i2c_funcs(encoder)->detect(encoder, connector); +} + +void nouveau_i2c_encoder_save(struct drm_encoder *encoder) +{ + get_encoder_i2c_funcs(encoder)->save(encoder); +} + +void nouveau_i2c_encoder_restore(struct drm_encoder *encoder) +{ + get_encoder_i2c_funcs(encoder)->restore(encoder); +} |