1 files changed, 326 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..979825d4a419
--- /dev/null
+++ b/drivers/media/i2c/adv748x/adv748x-csi2.c
@@ -0,0 +1,326 @@
+/*
+ * 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;
+}
+
+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);
+}
+
+/**
+ * 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);
+}
+
+/* -----------------------------------------------------------------------------
+ * 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);
+	}
+}
+
+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_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;
+}
+
+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;
+}
+
+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;
+}
+
+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 v4l2_ctrl *ctrl;
+
+	ctrl = v4l2_ctrl_find(sd->ctrl_handler, V4L2_CID_PIXEL_RATE);
+	if (!ctrl)
+		return -EINVAL;
+
+	return v4l2_ctrl_s_ctrl_int64(ctrl, 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);
+
+	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)
+{
+	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;
+}
+
+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);
+}