Release 4.16 drivers/media/i2c/adv748x/adv748x-csi2.c
/*
* Driver for Analog Devices ADV748X CSI-2 Transmitter
*
* Copyright (C) 2017 Renesas Electronics Corp.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/module.h>
#include <linux/mutex.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include "adv748x.h"
static bool is_txa(struct adv748x_csi2 *tx)
{
return tx == &tx->state->txa;
}
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static int adv748x_csi2_set_virtual_channel(struct adv748x_csi2 *tx,
unsigned int vc)
{
return tx_write(tx, ADV748X_CSI_VC_REF, vc << ADV748X_CSI_VC_REF_SHIFT);
}
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/**
* adv748x_csi2_register_link : Register and link internal entities
*
* @tx: CSI2 private entity
* @v4l2_dev: Video registration device
* @src: Source subdevice to establish link
* @src_pad: Pad number of source to link to this @tx
*
* Ensure that the subdevice is registered against the v4l2_device, and link the
* source pad to the sink pad of the CSI2 bus entity.
*/
static int adv748x_csi2_register_link(struct adv748x_csi2 *tx,
struct v4l2_device *v4l2_dev,
struct v4l2_subdev *src,
unsigned int src_pad)
{
int enabled = MEDIA_LNK_FL_ENABLED;
int ret;
/*
* Dynamic linking of the AFE is not supported.
* Register the links as immutable.
*/
enabled |= MEDIA_LNK_FL_IMMUTABLE;
if (!src->v4l2_dev) {
ret = v4l2_device_register_subdev(v4l2_dev, src);
if (ret)
return ret;
}
return media_create_pad_link(&src->entity, src_pad,
&tx->sd.entity, ADV748X_CSI2_SINK,
enabled);
}
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/* -----------------------------------------------------------------------------
* v4l2_subdev_internal_ops
*
* We use the internal registered operation to be able to ensure that our
* incremental subdevices (not connected in the forward path) can be registered
* against the resulting video path and media device.
*/
static int adv748x_csi2_registered(struct v4l2_subdev *sd)
{
struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
struct adv748x_state *state = tx->state;
adv_dbg(state, "Registered %s (%s)", is_txa(tx) ? "TXA":"TXB",
sd->name);
/*
* The adv748x hardware allows the AFE to route through the TXA, however
* this is not currently supported in this driver.
*
* Link HDMI->TXA, and AFE->TXB directly.
*/
if (is_txa(tx)) {
return adv748x_csi2_register_link(tx, sd->v4l2_dev,
&state->hdmi.sd,
ADV748X_HDMI_SOURCE);
} else {
return adv748x_csi2_register_link(tx, sd->v4l2_dev,
&state->afe.sd,
ADV748X_AFE_SOURCE);
}
}
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static const struct v4l2_subdev_internal_ops adv748x_csi2_internal_ops = {
.registered = adv748x_csi2_registered,
};
/* -----------------------------------------------------------------------------
* v4l2_subdev_video_ops
*/
static int adv748x_csi2_s_stream(struct v4l2_subdev *sd, int enable)
{
struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
struct v4l2_subdev *src;
src = adv748x_get_remote_sd(&tx->pads[ADV748X_CSI2_SINK]);
if (!src)
return -EPIPE;
return v4l2_subdev_call(src, video, s_stream, enable);
}
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static const struct v4l2_subdev_video_ops adv748x_csi2_video_ops = {
.s_stream = adv748x_csi2_s_stream,
};
/* -----------------------------------------------------------------------------
* v4l2_subdev_pad_ops
*
* The CSI2 bus pads are ignorant to the data sizes or formats.
* But we must support setting the pad formats for format propagation.
*/
static struct v4l2_mbus_framefmt *
adv748x_csi2_get_pad_format(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
unsigned int pad, u32 which)
{
struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
if (which == V4L2_SUBDEV_FORMAT_TRY)
return v4l2_subdev_get_try_format(sd, cfg, pad);
return &tx->format;
}
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static int adv748x_csi2_get_format(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *sdformat)
{
struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
struct adv748x_state *state = tx->state;
struct v4l2_mbus_framefmt *mbusformat;
mbusformat = adv748x_csi2_get_pad_format(sd, cfg, sdformat->pad,
sdformat->which);
if (!mbusformat)
return -EINVAL;
mutex_lock(&state->mutex);
sdformat->format = *mbusformat;
mutex_unlock(&state->mutex);
return 0;
}
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static int adv748x_csi2_set_format(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *sdformat)
{
struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
struct adv748x_state *state = tx->state;
struct v4l2_mbus_framefmt *mbusformat;
int ret = 0;
mbusformat = adv748x_csi2_get_pad_format(sd, cfg, sdformat->pad,
sdformat->which);
if (!mbusformat)
return -EINVAL;
mutex_lock(&state->mutex);
if (sdformat->pad == ADV748X_CSI2_SOURCE) {
const struct v4l2_mbus_framefmt *sink_fmt;
sink_fmt = adv748x_csi2_get_pad_format(sd, cfg,
ADV748X_CSI2_SINK,
sdformat->which);
if (!sink_fmt) {
ret = -EINVAL;
goto unlock;
}
sdformat->format = *sink_fmt;
}
*mbusformat = sdformat->format;
unlock:
mutex_unlock(&state->mutex);
return ret;
}
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static const struct v4l2_subdev_pad_ops adv748x_csi2_pad_ops = {
.get_fmt = adv748x_csi2_get_format,
.set_fmt = adv748x_csi2_set_format,
};
/* -----------------------------------------------------------------------------
* v4l2_subdev_ops
*/
static const struct v4l2_subdev_ops adv748x_csi2_ops = {
.video = &adv748x_csi2_video_ops,
.pad = &adv748x_csi2_pad_ops,
};
/* -----------------------------------------------------------------------------
* Subdev module and controls
*/
int adv748x_csi2_set_pixelrate(struct v4l2_subdev *sd, s64 rate)
{
struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
if (!tx->pixel_rate)
return -EINVAL;
return v4l2_ctrl_s_ctrl_int64(tx->pixel_rate, rate);
}
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static int adv748x_csi2_s_ctrl(struct v4l2_ctrl *ctrl)
{
switch (ctrl->id) {
case V4L2_CID_PIXEL_RATE:
return 0;
default:
return -EINVAL;
}
}
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static const struct v4l2_ctrl_ops adv748x_csi2_ctrl_ops = {
.s_ctrl = adv748x_csi2_s_ctrl,
};
static int adv748x_csi2_init_controls(struct adv748x_csi2 *tx)
{
v4l2_ctrl_handler_init(&tx->ctrl_hdl, 1);
tx->pixel_rate = v4l2_ctrl_new_std(&tx->ctrl_hdl,
&adv748x_csi2_ctrl_ops,
V4L2_CID_PIXEL_RATE, 1, INT_MAX,
1, 1);
tx->sd.ctrl_handler = &tx->ctrl_hdl;
if (tx->ctrl_hdl.error) {
v4l2_ctrl_handler_free(&tx->ctrl_hdl);
return tx->ctrl_hdl.error;
}
return v4l2_ctrl_handler_setup(&tx->ctrl_hdl);
}
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int adv748x_csi2_init(struct adv748x_state *state, struct adv748x_csi2 *tx)
{
struct device_node *ep;
int ret;
/* We can not use container_of to get back to the state with two TXs */
tx->state = state;
tx->page = is_txa(tx) ? ADV748X_PAGE_TXA : ADV748X_PAGE_TXB;
ep = state->endpoints[is_txa(tx) ? ADV748X_PORT_TXA : ADV748X_PORT_TXB];
if (!ep) {
adv_err(state, "No endpoint found for %s\n",
is_txa(tx) ? "txa" : "txb");
return -ENODEV;
}
/* Initialise the virtual channel */
adv748x_csi2_set_virtual_channel(tx, 0);
adv748x_subdev_init(&tx->sd, state, &adv748x_csi2_ops,
MEDIA_ENT_F_UNKNOWN,
is_txa(tx) ? "txa" : "txb");
/* Ensure that matching is based upon the endpoint fwnodes */
tx->sd.fwnode = of_fwnode_handle(ep);
/* Register internal ops for incremental subdev registration */
tx->sd.internal_ops = &adv748x_csi2_internal_ops;
tx->pads[ADV748X_CSI2_SINK].flags = MEDIA_PAD_FL_SINK;
tx->pads[ADV748X_CSI2_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
ret = media_entity_pads_init(&tx->sd.entity, ADV748X_CSI2_NR_PADS,
tx->pads);
if (ret)
return ret;
ret = adv748x_csi2_init_controls(tx);
if (ret)
goto err_free_media;
ret = v4l2_async_register_subdev(&tx->sd);
if (ret)
goto err_free_ctrl;
return 0;
err_free_ctrl:
v4l2_ctrl_handler_free(&tx->ctrl_hdl);
err_free_media:
media_entity_cleanup(&tx->sd.entity);
return ret;
}
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void adv748x_csi2_cleanup(struct adv748x_csi2 *tx)
{
v4l2_async_unregister_subdev(&tx->sd);
media_entity_cleanup(&tx->sd.entity);
v4l2_ctrl_handler_free(&tx->ctrl_hdl);
}
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