diff options
Diffstat (limited to 'drivers/media/i2c/adv748x/adv748x-csi2.c')
-rw-r--r-- | drivers/media/i2c/adv748x/adv748x-csi2.c | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/drivers/media/i2c/adv748x/adv748x-csi2.c b/drivers/media/i2c/adv748x/adv748x-csi2.c new file mode 100644 index 000000000..bd4f3fe0e --- /dev/null +++ b/drivers/media/i2c/adv748x/adv748x-csi2.c @@ -0,0 +1,343 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Driver for Analog Devices ADV748X CSI-2 Transmitter + * + * Copyright (C) 2017 Renesas Electronics Corp. + */ + +#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" + +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); +} + +/** + * 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 + * @enable: Link enabled flag + * + * 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, + bool enable) +{ + int ret; + + if (!src->v4l2_dev) { + ret = v4l2_device_register_subdev(v4l2_dev, src); + if (ret) + return ret; + } + + ret = media_create_pad_link(&src->entity, src_pad, + &tx->sd.entity, ADV748X_CSI2_SINK, + enable ? MEDIA_LNK_FL_ENABLED : 0); + if (ret) + return ret; + + if (enable) + tx->src = src; + + return 0; +} + +/* ----------------------------------------------------------------------------- + * 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; + int ret; + + adv_dbg(state, "Registered %s (%s)", is_txa(tx) ? "TXA":"TXB", + sd->name); + + /* + * Link TXA to AFE and HDMI, and TXB to AFE only as TXB cannot output + * HDMI. + * + * The HDMI->TXA link is enabled by default, as is the AFE->TXB one. + */ + if (is_afe_enabled(state)) { + ret = adv748x_csi2_register_link(tx, sd->v4l2_dev, + &state->afe.sd, + ADV748X_AFE_SOURCE, + is_txb(tx)); + if (ret) + return ret; + + /* TXB can output AFE signals only. */ + if (is_txb(tx)) + state->afe.tx = tx; + } + + /* Register link to HDMI for TXA only. */ + if (is_txb(tx) || !is_hdmi_enabled(state)) + return 0; + + ret = adv748x_csi2_register_link(tx, sd->v4l2_dev, &state->hdmi.sd, + ADV748X_HDMI_SOURCE, true); + if (ret) + return ret; + + /* The default HDMI output is TXA. */ + state->hdmi.tx = tx; + + return 0; +} + +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); +} + +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_state *sd_state, + 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, sd_state, pad); + + return &tx->format; +} + +static int adv748x_csi2_get_format(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + 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, sd_state, sdformat->pad, + sdformat->which); + if (!mbusformat) + return -EINVAL; + + mutex_lock(&state->mutex); + + sdformat->format = *mbusformat; + + mutex_unlock(&state->mutex); + + return 0; +} + +static int adv748x_csi2_set_format(struct v4l2_subdev *sd, + struct v4l2_subdev_state *sd_state, + 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, sd_state, 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, sd_state, + 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; +} + +static int adv748x_csi2_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad, + struct v4l2_mbus_config *config) +{ + struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd); + + if (pad != ADV748X_CSI2_SOURCE) + return -EINVAL; + + config->type = V4L2_MBUS_CSI2_DPHY; + config->bus.mipi_csi2.num_data_lanes = tx->active_lanes; + + return 0; +} + +static const struct v4l2_subdev_pad_ops adv748x_csi2_pad_ops = { + .get_fmt = adv748x_csi2_get_format, + .set_fmt = adv748x_csi2_set_format, + .get_mbus_config = adv748x_csi2_get_mbus_config, +}; + +/* ----------------------------------------------------------------------------- + * 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); +} + +static int adv748x_csi2_s_ctrl(struct v4l2_ctrl *ctrl) +{ + switch (ctrl->id) { + case V4L2_CID_PIXEL_RATE: + return 0; + default: + return -EINVAL; + } +} + +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); +} + +int adv748x_csi2_init(struct adv748x_state *state, struct adv748x_csi2 *tx) +{ + int ret; + + if (!is_tx_enabled(tx)) + return 0; + + adv748x_subdev_init(&tx->sd, state, &adv748x_csi2_ops, + MEDIA_ENT_F_VID_IF_BRIDGE, + is_txa(tx) ? "txa" : "txb"); + + /* Ensure that matching is based upon the endpoint fwnodes */ + tx->sd.fwnode = of_fwnode_handle(state->endpoints[tx->port]); + + /* 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; +} + +void adv748x_csi2_cleanup(struct adv748x_csi2 *tx) +{ + if (!is_tx_enabled(tx)) + return; + + v4l2_async_unregister_subdev(&tx->sd); + media_entity_cleanup(&tx->sd.entity); + v4l2_ctrl_handler_free(&tx->ctrl_hdl); +} |