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// SPDX-License-Identifier: GPL-2.0
/*
* Driver for STM32 Digital Camera Memory Interface Pixel Processor
*
* Copyright (C) STMicroelectronics SA 2023
* Authors: Hugues Fruchet <hugues.fruchet@foss.st.com>
* Alain Volmat <alain.volmat@foss.st.com>
* for STMicroelectronics.
*/
#include <linux/init.h>
#include <linux/module.h>
#include "dcmipp-common.h"
/* Helper function to allocate and initialize pads */
struct media_pad *dcmipp_pads_init(u16 num_pads, const unsigned long *pads_flags)
{
struct media_pad *pads;
unsigned int i;
/* Allocate memory for the pads */
pads = kcalloc(num_pads, sizeof(*pads), GFP_KERNEL);
if (!pads)
return ERR_PTR(-ENOMEM);
/* Initialize the pads */
for (i = 0; i < num_pads; i++) {
pads[i].index = i;
pads[i].flags = pads_flags[i];
}
return pads;
}
static const struct media_entity_operations dcmipp_entity_ops = {
.link_validate = v4l2_subdev_link_validate,
};
int dcmipp_ent_sd_register(struct dcmipp_ent_device *ved,
struct v4l2_subdev *sd,
struct v4l2_device *v4l2_dev,
const char *const name,
u32 function,
u16 num_pads,
const unsigned long *pads_flag,
const struct v4l2_subdev_internal_ops *sd_int_ops,
const struct v4l2_subdev_ops *sd_ops,
irq_handler_t handler,
irq_handler_t thread_fn)
{
int ret;
/* Allocate the pads. Should be released from the sd_int_op release */
ved->pads = dcmipp_pads_init(num_pads, pads_flag);
if (IS_ERR(ved->pads))
return PTR_ERR(ved->pads);
/* Fill the dcmipp_ent_device struct */
ved->ent = &sd->entity;
/* Initialize the subdev */
v4l2_subdev_init(sd, sd_ops);
sd->internal_ops = sd_int_ops;
sd->entity.function = function;
sd->entity.ops = &dcmipp_entity_ops;
sd->owner = THIS_MODULE;
strscpy(sd->name, name, sizeof(sd->name));
v4l2_set_subdevdata(sd, ved);
/* Expose this subdev to user space */
sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
if (sd->ctrl_handler)
sd->flags |= V4L2_SUBDEV_FL_HAS_EVENTS;
/* Initialize the media entity */
ret = media_entity_pads_init(&sd->entity, num_pads, ved->pads);
if (ret)
goto err_clean_pads;
ret = v4l2_subdev_init_finalize(sd);
if (ret < 0)
goto err_clean_m_ent;
/* Register the subdev with the v4l2 and the media framework */
ret = v4l2_device_register_subdev(v4l2_dev, sd);
if (ret) {
dev_err(v4l2_dev->dev,
"%s: subdev register failed (err=%d)\n",
name, ret);
goto err_clean_m_ent;
}
ved->handler = handler;
ved->thread_fn = thread_fn;
return 0;
err_clean_m_ent:
media_entity_cleanup(&sd->entity);
err_clean_pads:
dcmipp_pads_cleanup(ved->pads);
return ret;
}
void
dcmipp_ent_sd_unregister(struct dcmipp_ent_device *ved, struct v4l2_subdev *sd)
{
media_entity_cleanup(ved->ent);
v4l2_device_unregister_subdev(sd);
}
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