drivers/gpu/drm/nouveau/dispnv04/nouveau_i2c_encoder.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/dispnv04/nouveau_i2c_encoder.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/dispnv04/nouveau_i2c_encoder.c
Extension
.c
Size
3993 bytes
Lines
126
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

#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;
}

/*
 * 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);
}

Annotation

Implementation Notes