1 files changed, 393 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 000000000000..ebe7da8ebed7
--- /dev/null
+++ b/drivers/media/i2c/adv748x/adv748x-csi2.c
@@ -0,0 +1,393 @@
+// 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 <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+
+#include "adv748x.h"
+
+static const unsigned int adv748x_csi2_txa_fmts[] = {
+	MEDIA_BUS_FMT_UYVY8_1X16,
+	MEDIA_BUS_FMT_RGB888_1X24,
+};
+
+static const unsigned int adv748x_csi2_txb_fmts[] = {
+	MEDIA_BUS_FMT_UYVY8_1X16,
+};
+
+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
+ */
+
+static int adv748x_csi2_init_state(struct v4l2_subdev *sd,
+				   struct v4l2_subdev_state *state)
+{
+	static const struct v4l2_mbus_framefmt adv748x_csi2_default_fmt = {
+		.width		= 1280,
+		.height		= 720,
+		.code		= MEDIA_BUS_FMT_UYVY8_1X16,
+		.colorspace	= V4L2_COLORSPACE_SRGB,
+		.field		= V4L2_FIELD_NONE,
+		.ycbcr_enc	= V4L2_YCBCR_ENC_DEFAULT,
+		.quantization	= V4L2_QUANTIZATION_DEFAULT,
+		.xfer_func	= V4L2_XFER_FUNC_DEFAULT,
+	};
+	struct v4l2_mbus_framefmt *fmt;
+
+	fmt = v4l2_subdev_state_get_format(state, ADV748X_CSI2_SINK);
+	*fmt = adv748x_csi2_default_fmt;
+
+	fmt = v4l2_subdev_state_get_format(state, ADV748X_CSI2_SOURCE);
+	*fmt = adv748x_csi2_default_fmt;
+
+	return 0;
+}
+
+/*
+ * 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 = {
+	.init_state = adv748x_csi2_init_state,
+	.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 int adv748x_csi2_enum_mbus_code(struct v4l2_subdev *sd,
+				       struct v4l2_subdev_state *sd_state,
+				       struct v4l2_subdev_mbus_code_enum *code)
+{
+	struct adv748x_csi2 *tx = adv748x_sd_to_csi2(sd);
+	const unsigned int *codes = is_txa(tx) ?
+				    adv748x_csi2_txa_fmts :
+				    adv748x_csi2_txb_fmts;
+	size_t num_fmts = is_txa(tx) ? ARRAY_SIZE(adv748x_csi2_txa_fmts)
+				     : ARRAY_SIZE(adv748x_csi2_txb_fmts);
+
+	/*
+	 * The format available on the source pad is the one applied on the sink
+	 * pad.
+	 */
+	if (code->pad == ADV748X_CSI2_SOURCE) {
+		struct v4l2_mbus_framefmt *fmt;
+
+		if (code->index)
+			return -EINVAL;
+
+		fmt = v4l2_subdev_state_get_format(sd_state, ADV748X_CSI2_SINK);
+		code->code = fmt->code;
+
+		return 0;
+	}
+
+	if (code->index >= num_fmts)
+		return -EINVAL;
+
+	code->code = codes[code->index];
+
+	return 0;
+}
+
+static bool adv748x_csi2_is_fmt_supported(struct adv748x_csi2 *tx, u32 code)
+{
+	const unsigned int *codes = is_txa(tx) ?
+				    adv748x_csi2_txa_fmts :
+				    adv748x_csi2_txb_fmts;
+	size_t num_fmts = is_txa(tx) ? ARRAY_SIZE(adv748x_csi2_txa_fmts)
+				     : ARRAY_SIZE(adv748x_csi2_txb_fmts);
+
+	for (unsigned int i = 0; i < num_fmts; i++) {
+		if (codes[i] == code)
+			return true;
+	}
+
+	return false;
+}
+
+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 v4l2_mbus_framefmt *mbusformat;
+
+	if (sdformat->pad == ADV748X_CSI2_SOURCE)
+		return v4l2_subdev_get_fmt(sd, sd_state, sdformat);
+
+	/*
+	 * Make sure the format is supported, if not default it to
+	 * UYVY8 as it's supported by both TXes.
+	 */
+	if (!adv748x_csi2_is_fmt_supported(tx, sdformat->format.code))
+		sdformat->format.code = MEDIA_BUS_FMT_UYVY8_1X16;
+
+	mbusformat = v4l2_subdev_state_get_format(sd_state, sdformat->pad);
+	*mbusformat = sdformat->format;
+
+	/* Propagate format to the source pad. */
+	mbusformat = v4l2_subdev_state_get_format(sd_state, ADV748X_CSI2_SOURCE);
+	*mbusformat = sdformat->format;
+
+	return 0;
+}
+
+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 = {
+	.enum_mbus_code = adv748x_csi2_enum_mbus_code,
+	.get_fmt = v4l2_subdev_get_fmt,
+	.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");
+
+	/* 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 = v4l2_async_subdev_endpoint_add(&tx->sd,
+					     of_fwnode_handle(state->endpoints[tx->port]));
+	if (ret)
+		goto err_free_media;
+
+	ret = adv748x_csi2_init_controls(tx);
+	if (ret)
+		goto err_cleanup_subdev;
+
+	tx->sd.state_lock = &state->mutex;
+	ret = v4l2_subdev_init_finalize(&tx->sd);
+	if (ret)
+		goto err_free_ctrl;
+
+	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_cleanup_subdev:
+	v4l2_subdev_cleanup(&tx->sd);
+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);
+	v4l2_subdev_cleanup(&tx->sd);
+}