--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2023 Intel Corporation. All rights reserved.
+ * Intel Visual Sensing Controller CSI Linux driver
+ */
+
+/*
+ * To set ownership of CSI-2 link and to configure CSI-2 link, there
+ * are specific commands, which are sent via MEI protocol. The send
+ * command function uses "completion" as a synchronization mechanism.
+ * The response for command is received via a mei callback which wakes
+ * up the caller. There can be only one outstanding command at a time.
+ */
+
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/math64.h>
+#include <linux/mei_cl_bus.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/units.h>
+#include <linux/uuid.h>
+#include <linux/workqueue.h>
+
+#include <media/v4l2-async.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-subdev.h>
+
+#define MEI_CSI_DRIVER_NAME "ivsc_csi"
+#define MEI_CSI_ENTITY_NAME "Intel IVSC CSI"
+
+#define MEI_CSI_LINK_FREQ_400MHZ 400000000ULL
+
+/* the 5s used here is based on experiment */
+#define CSI_CMD_TIMEOUT (5 * HZ)
+/* to setup CSI-2 link an extra delay needed and determined experimentally */
+#define CSI_FW_READY_DELAY_MS 100
+/* link frequency unit is 100kHz */
+#define CSI_LINK_FREQ(x) ((u32)(div_u64(x, 100 * HZ_PER_KHZ)))
+
+/*
+ * identify the command id supported by firmware
+ * IPC, as well as the privacy notification id
+ * used when processing privacy event.
+ */
+enum csi_cmd_id {
+ /* used to set csi ownership */
+ CSI_SET_OWNER = 0,
+
+ /* used to configure CSI-2 link */
+ CSI_SET_CONF = 2,
+
+ /* privacy notification id used when privacy state changes */
+ CSI_PRIVACY_NOTIF = 6,
+};
+
+/* CSI-2 link ownership definition */
+enum csi_link_owner {
+ CSI_LINK_IVSC,
+ CSI_LINK_HOST,
+};
+
+/* privacy status definition */
+enum ivsc_privacy_status {
+ CSI_PRIVACY_OFF,
+ CSI_PRIVACY_ON,
+ CSI_PRIVACY_MAX,
+};
+
+enum csi_pads {
+ CSI_PAD_SOURCE,
+ CSI_PAD_SINK,
+ CSI_NUM_PADS
+};
+
+/* configuration of the CSI-2 link between host and IVSC */
+struct csi_link_cfg {
+ /* number of data lanes used on the CSI-2 link */
+ u32 nr_of_lanes;
+
+ /* frequency of the CSI-2 link */
+ u32 link_freq;
+
+ /* for future use */
+ u32 rsvd[2];
+} __packed;
+
+/* CSI command structure */
+struct csi_cmd {
+ u32 cmd_id;
+ union _cmd_param {
+ u32 param;
+ struct csi_link_cfg conf;
+ } param;
+} __packed;
+
+/* CSI notification structure */
+struct csi_notif {
+ u32 cmd_id;
+ int status;
+ union _resp_cont {
+ u32 cont;
+ struct csi_link_cfg conf;
+ } cont;
+} __packed;
+
+struct mei_csi {
+ struct mei_cl_device *cldev;
+
+ /* command response */
+ struct csi_notif cmd_response;
+ /* used to wait for command response from firmware */
+ struct completion cmd_completion;
+ /* protect command download */
+ struct mutex lock;
+
+ struct v4l2_subdev subdev;
+ struct v4l2_subdev *remote;
+ struct v4l2_async_notifier notifier;
+ struct v4l2_ctrl_handler ctrl_handler;
+ struct v4l2_ctrl *freq_ctrl;
+ struct v4l2_ctrl *privacy_ctrl;
+ unsigned int remote_pad;
+ /* start streaming or not */
+ int streaming;
+
+ struct media_pad pads[CSI_NUM_PADS];
+ struct v4l2_mbus_framefmt format_mbus[CSI_NUM_PADS];
+
+ /* number of data lanes used on the CSI-2 link */
+ u32 nr_of_lanes;
+ /* frequency of the CSI-2 link */
+ u64 link_freq;
+
+ /* privacy status */
+ enum ivsc_privacy_status status;
+};
+
+static const struct v4l2_mbus_framefmt mei_csi_format_mbus_default = {
+ .width = 1,
+ .height = 1,
+ .code = MEDIA_BUS_FMT_Y8_1X8,
+ .field = V4L2_FIELD_NONE,
+};
+
+static s64 link_freq_menu_items[] = {
+ MEI_CSI_LINK_FREQ_400MHZ
+};
+
+static inline struct mei_csi *notifier_to_csi(struct v4l2_async_notifier *n)
+{
+ return container_of(n, struct mei_csi, notifier);
+}
+
+static inline struct mei_csi *sd_to_csi(struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct mei_csi, subdev);
+}
+
+static inline struct mei_csi *ctrl_to_csi(struct v4l2_ctrl *ctrl)
+{
+ return container_of(ctrl->handler, struct mei_csi, ctrl_handler);
+}
+
+/* send a command to firmware and mutex must be held by caller */
+static int mei_csi_send(struct mei_csi *csi, u8 *buf, size_t len)
+{
+ struct csi_cmd *cmd = (struct csi_cmd *)buf;
+ int ret;
+
+ reinit_completion(&csi->cmd_completion);
+
+ ret = mei_cldev_send(csi->cldev, buf, len);
+ if (ret < 0)
+ goto out;
+
+ ret = wait_for_completion_killable_timeout(&csi->cmd_completion,
+ CSI_CMD_TIMEOUT);
+ if (ret < 0) {
+ goto out;
+ } else if (!ret) {
+ ret = -ETIMEDOUT;
+ goto out;
+ }
+
+ /* command response status */
+ ret = csi->cmd_response.status;
+ if (ret) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (csi->cmd_response.cmd_id != cmd->cmd_id)
+ ret = -EINVAL;
+
+out:
+ return ret;
+}
+
+/* set CSI-2 link ownership */
+static int csi_set_link_owner(struct mei_csi *csi, enum csi_link_owner owner)
+{
+ struct csi_cmd cmd = { 0 };
+ size_t cmd_size;
+ int ret;
+
+ cmd.cmd_id = CSI_SET_OWNER;
+ cmd.param.param = owner;
+ cmd_size = sizeof(cmd.cmd_id) + sizeof(cmd.param.param);
+
+ mutex_lock(&csi->lock);
+
+ ret = mei_csi_send(csi, (u8 *)&cmd, cmd_size);
+
+ mutex_unlock(&csi->lock);
+
+ return ret;
+}
+
+/* configure CSI-2 link between host and IVSC */
+static int csi_set_link_cfg(struct mei_csi *csi)
+{
+ struct csi_cmd cmd = { 0 };
+ size_t cmd_size;
+ int ret;
+
+ cmd.cmd_id = CSI_SET_CONF;
+ cmd.param.conf.nr_of_lanes = csi->nr_of_lanes;
+ cmd.param.conf.link_freq = CSI_LINK_FREQ(csi->link_freq);
+ cmd_size = sizeof(cmd.cmd_id) + sizeof(cmd.param.conf);
+
+ mutex_lock(&csi->lock);
+
+ ret = mei_csi_send(csi, (u8 *)&cmd, cmd_size);
+ /*
+ * wait configuration ready if download success. placing
+ * delay under mutex is to make sure current command flow
+ * completed before starting a possible new one.
+ */
+ if (!ret)
+ msleep(CSI_FW_READY_DELAY_MS);
+
+ mutex_unlock(&csi->lock);
+
+ return ret;
+}
+
+/* callback for receive */
+static void mei_csi_rx(struct mei_cl_device *cldev)
+{
+ struct mei_csi *csi = mei_cldev_get_drvdata(cldev);
+ struct csi_notif notif = { 0 };
+ int ret;
+
+ ret = mei_cldev_recv(cldev, (u8 *)¬if, sizeof(notif));
+ if (ret < 0) {
+ dev_err(&cldev->dev, "recv error: %d\n", ret);
+ return;
+ }
+
+ switch (notif.cmd_id) {
+ case CSI_PRIVACY_NOTIF:
+ if (notif.cont.cont < CSI_PRIVACY_MAX) {
+ csi->status = notif.cont.cont;
+ v4l2_ctrl_s_ctrl(csi->privacy_ctrl, csi->status);
+ }
+ break;
+ case CSI_SET_OWNER:
+ case CSI_SET_CONF:
+ memcpy(&csi->cmd_response, ¬if, ret);
+
+ complete(&csi->cmd_completion);
+ break;
+ default:
+ break;
+ }
+}
+
+static int mei_csi_set_stream(struct v4l2_subdev *sd, int enable)
+{
+ struct mei_csi *csi = sd_to_csi(sd);
+ s64 freq;
+ int ret;
+
+ if (enable && csi->streaming == 0) {
+ freq = v4l2_get_link_freq(csi->remote->ctrl_handler, 0, 0);
+ if (freq < 0) {
+ dev_err(&csi->cldev->dev,
+ "error %lld, invalid link_freq\n", freq);
+ ret = freq;
+ goto err;
+ }
+ csi->link_freq = freq;
+
+ /* switch CSI-2 link to host */
+ ret = csi_set_link_owner(csi, CSI_LINK_HOST);
+ if (ret < 0)
+ goto err;
+
+ /* configure CSI-2 link */
+ ret = csi_set_link_cfg(csi);
+ if (ret < 0)
+ goto err_switch;
+
+ ret = v4l2_subdev_call(csi->remote, video, s_stream, 1);
+ if (ret)
+ goto err_switch;
+ } else if (!enable && csi->streaming == 1) {
+ v4l2_subdev_call(csi->remote, video, s_stream, 0);
+
+ /* switch CSI-2 link to IVSC */
+ ret = csi_set_link_owner(csi, CSI_LINK_IVSC);
+ if (ret < 0)
+ dev_warn(&csi->cldev->dev,
+ "failed to switch CSI2 link: %d\n", ret);
+ }
+
+ csi->streaming = enable;
+
+ return 0;
+
+err_switch:
+ csi_set_link_owner(csi, CSI_LINK_IVSC);
+
+err:
+ return ret;
+}
+
+static struct v4l2_mbus_framefmt *
+mei_csi_get_pad_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state,
+ unsigned int pad, u32 which)
+{
+ struct mei_csi *csi = sd_to_csi(sd);
+
+ switch (which) {
+ case V4L2_SUBDEV_FORMAT_TRY:
+ return v4l2_subdev_get_try_format(sd, sd_state, pad);
+ case V4L2_SUBDEV_FORMAT_ACTIVE:
+ return &csi->format_mbus[pad];
+ default:
+ return NULL;
+ }
+}
+
+static int mei_csi_init_cfg(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state)
+{
+ struct v4l2_mbus_framefmt *mbusformat;
+ struct mei_csi *csi = sd_to_csi(sd);
+ unsigned int i;
+
+ mutex_lock(&csi->lock);
+
+ for (i = 0; i < sd->entity.num_pads; i++) {
+ mbusformat = v4l2_subdev_get_try_format(sd, sd_state, i);
+ *mbusformat = mei_csi_format_mbus_default;
+ }
+
+ mutex_unlock(&csi->lock);
+
+ return 0;
+}
+
+static int mei_csi_get_fmt(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_format *format)
+{
+ struct v4l2_mbus_framefmt *mbusformat;
+ struct mei_csi *csi = sd_to_csi(sd);
+
+ mutex_lock(&csi->lock);
+
+ mbusformat = mei_csi_get_pad_format(sd, sd_state, format->pad,
+ format->which);
+ if (mbusformat)
+ format->format = *mbusformat;
+
+ mutex_unlock(&csi->lock);
+
+ return 0;
+}
+
+static int mei_csi_set_fmt(struct v4l2_subdev *sd,
+ struct v4l2_subdev_state *sd_state,
+ struct v4l2_subdev_format *format)
+{
+ struct v4l2_mbus_framefmt *source_mbusformat;
+ struct v4l2_mbus_framefmt *mbusformat;
+ struct mei_csi *csi = sd_to_csi(sd);
+ struct media_pad *pad;
+
+ mbusformat = mei_csi_get_pad_format(sd, sd_state, format->pad,
+ format->which);
+ if (!mbusformat)
+ return -EINVAL;
+
+ source_mbusformat = mei_csi_get_pad_format(sd, sd_state, CSI_PAD_SOURCE,
+ format->which);
+ if (!source_mbusformat)
+ return -EINVAL;
+
+ v4l_bound_align_image(&format->format.width, 1, 65536, 0,
+ &format->format.height, 1, 65536, 0, 0);
+
+ switch (format->format.code) {
+ case MEDIA_BUS_FMT_RGB444_1X12:
+ case MEDIA_BUS_FMT_RGB444_2X8_PADHI_BE:
+ case MEDIA_BUS_FMT_RGB444_2X8_PADHI_LE:
+ case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE:
+ case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
+ case MEDIA_BUS_FMT_RGB565_1X16:
+ case MEDIA_BUS_FMT_BGR565_2X8_BE:
+ case MEDIA_BUS_FMT_BGR565_2X8_LE:
+ case MEDIA_BUS_FMT_RGB565_2X8_BE:
+ case MEDIA_BUS_FMT_RGB565_2X8_LE:
+ case MEDIA_BUS_FMT_RGB666_1X18:
+ case MEDIA_BUS_FMT_RBG888_1X24:
+ case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
+ case MEDIA_BUS_FMT_BGR888_1X24:
+ case MEDIA_BUS_FMT_GBR888_1X24:
+ case MEDIA_BUS_FMT_RGB888_1X24:
+ case MEDIA_BUS_FMT_RGB888_2X12_BE:
+ case MEDIA_BUS_FMT_RGB888_2X12_LE:
+ case MEDIA_BUS_FMT_ARGB8888_1X32:
+ case MEDIA_BUS_FMT_RGB888_1X32_PADHI:
+ case MEDIA_BUS_FMT_RGB101010_1X30:
+ case MEDIA_BUS_FMT_RGB121212_1X36:
+ case MEDIA_BUS_FMT_RGB161616_1X48:
+ case MEDIA_BUS_FMT_Y8_1X8:
+ case MEDIA_BUS_FMT_UV8_1X8:
+ case MEDIA_BUS_FMT_UYVY8_1_5X8:
+ case MEDIA_BUS_FMT_VYUY8_1_5X8:
+ case MEDIA_BUS_FMT_YUYV8_1_5X8:
+ case MEDIA_BUS_FMT_YVYU8_1_5X8:
+ case MEDIA_BUS_FMT_UYVY8_2X8:
+ case MEDIA_BUS_FMT_VYUY8_2X8:
+ case MEDIA_BUS_FMT_YUYV8_2X8:
+ case MEDIA_BUS_FMT_YVYU8_2X8:
+ case MEDIA_BUS_FMT_Y10_1X10:
+ case MEDIA_BUS_FMT_UYVY10_2X10:
+ case MEDIA_BUS_FMT_VYUY10_2X10:
+ case MEDIA_BUS_FMT_YUYV10_2X10:
+ case MEDIA_BUS_FMT_YVYU10_2X10:
+ case MEDIA_BUS_FMT_Y12_1X12:
+ case MEDIA_BUS_FMT_UYVY12_2X12:
+ case MEDIA_BUS_FMT_VYUY12_2X12:
+ case MEDIA_BUS_FMT_YUYV12_2X12:
+ case MEDIA_BUS_FMT_YVYU12_2X12:
+ case MEDIA_BUS_FMT_UYVY8_1X16:
+ case MEDIA_BUS_FMT_VYUY8_1X16:
+ case MEDIA_BUS_FMT_YUYV8_1X16:
+ case MEDIA_BUS_FMT_YVYU8_1X16:
+ case MEDIA_BUS_FMT_YDYUYDYV8_1X16:
+ case MEDIA_BUS_FMT_UYVY10_1X20:
+ case MEDIA_BUS_FMT_VYUY10_1X20:
+ case MEDIA_BUS_FMT_YUYV10_1X20:
+ case MEDIA_BUS_FMT_YVYU10_1X20:
+ case MEDIA_BUS_FMT_VUY8_1X24:
+ case MEDIA_BUS_FMT_YUV8_1X24:
+ case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
+ case MEDIA_BUS_FMT_UYVY12_1X24:
+ case MEDIA_BUS_FMT_VYUY12_1X24:
+ case MEDIA_BUS_FMT_YUYV12_1X24:
+ case MEDIA_BUS_FMT_YVYU12_1X24:
+ case MEDIA_BUS_FMT_YUV10_1X30:
+ case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
+ case MEDIA_BUS_FMT_AYUV8_1X32:
+ case MEDIA_BUS_FMT_UYYVYY12_0_5X36:
+ case MEDIA_BUS_FMT_YUV12_1X36:
+ case MEDIA_BUS_FMT_YUV16_1X48:
+ case MEDIA_BUS_FMT_UYYVYY16_0_5X48:
+ case MEDIA_BUS_FMT_JPEG_1X8:
+ case MEDIA_BUS_FMT_AHSV8888_1X32:
+ case MEDIA_BUS_FMT_SBGGR8_1X8:
+ case MEDIA_BUS_FMT_SGBRG8_1X8:
+ case MEDIA_BUS_FMT_SGRBG8_1X8:
+ case MEDIA_BUS_FMT_SRGGB8_1X8:
+ case MEDIA_BUS_FMT_SBGGR10_1X10:
+ case MEDIA_BUS_FMT_SGBRG10_1X10:
+ case MEDIA_BUS_FMT_SGRBG10_1X10:
+ case MEDIA_BUS_FMT_SRGGB10_1X10:
+ case MEDIA_BUS_FMT_SBGGR12_1X12:
+ case MEDIA_BUS_FMT_SGBRG12_1X12:
+ case MEDIA_BUS_FMT_SGRBG12_1X12:
+ case MEDIA_BUS_FMT_SRGGB12_1X12:
+ case MEDIA_BUS_FMT_SBGGR14_1X14:
+ case MEDIA_BUS_FMT_SGBRG14_1X14:
+ case MEDIA_BUS_FMT_SGRBG14_1X14:
+ case MEDIA_BUS_FMT_SRGGB14_1X14:
+ case MEDIA_BUS_FMT_SBGGR16_1X16:
+ case MEDIA_BUS_FMT_SGBRG16_1X16:
+ case MEDIA_BUS_FMT_SGRBG16_1X16:
+ case MEDIA_BUS_FMT_SRGGB16_1X16:
+ break;
+ default:
+ format->format.code = MEDIA_BUS_FMT_Y8_1X8;
+ break;
+ }
+
+ if (format->format.field == V4L2_FIELD_ANY)
+ format->format.field = V4L2_FIELD_NONE;
+
+ mutex_lock(&csi->lock);
+
+ pad = &csi->pads[format->pad];
+ if (pad->flags & MEDIA_PAD_FL_SOURCE)
+ format->format = csi->format_mbus[CSI_PAD_SINK];
+
+ *mbusformat = format->format;
+
+ if (pad->flags & MEDIA_PAD_FL_SINK)
+ *source_mbusformat = format->format;
+
+ mutex_unlock(&csi->lock);
+
+ return 0;
+}
+
+static int mei_csi_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
+{
+ struct mei_csi *csi = ctrl_to_csi(ctrl);
+ s64 freq;
+
+ if (ctrl->id == V4L2_CID_LINK_FREQ) {
+ if (!csi->remote)
+ return -EINVAL;
+
+ freq = v4l2_get_link_freq(csi->remote->ctrl_handler, 0, 0);
+ if (freq < 0) {
+ dev_err(&csi->cldev->dev,
+ "error %lld, invalid link_freq\n", freq);
+ return -EINVAL;
+ }
+
+ link_freq_menu_items[0] = freq;
+ ctrl->val = 0;
+
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static const struct v4l2_ctrl_ops mei_csi_ctrl_ops = {
+ .g_volatile_ctrl = mei_csi_g_volatile_ctrl,
+};
+
+static const struct v4l2_subdev_video_ops mei_csi_video_ops = {
+ .s_stream = mei_csi_set_stream,
+};
+
+static const struct v4l2_subdev_pad_ops mei_csi_pad_ops = {
+ .init_cfg = mei_csi_init_cfg,
+ .get_fmt = mei_csi_get_fmt,
+ .set_fmt = mei_csi_set_fmt,
+};
+
+static const struct v4l2_subdev_ops mei_csi_subdev_ops = {
+ .video = &mei_csi_video_ops,
+ .pad = &mei_csi_pad_ops,
+};
+
+static const struct media_entity_operations mei_csi_entity_ops = {
+ .link_validate = v4l2_subdev_link_validate,
+};
+
+static int mei_csi_notify_bound(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_connection *asd)
+{
+ struct mei_csi *csi = notifier_to_csi(notifier);
+ int pad;
+
+ pad = media_entity_get_fwnode_pad(&subdev->entity, asd->match.fwnode,
+ MEDIA_PAD_FL_SOURCE);
+ if (pad < 0)
+ return pad;
+
+ csi->remote = subdev;
+ csi->remote_pad = pad;
+
+ return media_create_pad_link(&subdev->entity, pad,
+ &csi->subdev.entity, 1,
+ MEDIA_LNK_FL_ENABLED |
+ MEDIA_LNK_FL_IMMUTABLE);
+}
+
+static void mei_csi_notify_unbind(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_connection *asd)
+{
+ struct mei_csi *csi = notifier_to_csi(notifier);
+
+ csi->remote = NULL;
+}
+
+static const struct v4l2_async_notifier_operations mei_csi_notify_ops = {
+ .bound = mei_csi_notify_bound,
+ .unbind = mei_csi_notify_unbind,
+};
+
+static int mei_csi_init_controls(struct mei_csi *csi)
+{
+ u32 max;
+ int ret;
+
+ ret = v4l2_ctrl_handler_init(&csi->ctrl_handler, 2);
+ if (ret)
+ return ret;
+
+ csi->ctrl_handler.lock = &csi->lock;
+
+ max = ARRAY_SIZE(link_freq_menu_items) - 1;
+ csi->freq_ctrl = v4l2_ctrl_new_int_menu(&csi->ctrl_handler,
+ &mei_csi_ctrl_ops,
+ V4L2_CID_LINK_FREQ,
+ max,
+ 0,
+ link_freq_menu_items);
+ if (csi->freq_ctrl)
+ csi->freq_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY |
+ V4L2_CTRL_FLAG_VOLATILE;
+
+ csi->privacy_ctrl = v4l2_ctrl_new_std(&csi->ctrl_handler, NULL,
+ V4L2_CID_PRIVACY, 0, 1, 1, 0);
+ if (csi->privacy_ctrl)
+ csi->privacy_ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;
+
+ if (csi->ctrl_handler.error)
+ return csi->ctrl_handler.error;
+
+ csi->subdev.ctrl_handler = &csi->ctrl_handler;
+
+ return 0;
+}
+
+static int mei_csi_parse_firmware(struct mei_csi *csi)
+{
+ struct v4l2_fwnode_endpoint v4l2_ep = {
+ .bus_type = V4L2_MBUS_CSI2_DPHY,
+ };
+ struct device *dev = &csi->cldev->dev;
+ struct v4l2_async_connection *asd;
+ struct fwnode_handle *fwnode;
+ struct fwnode_handle *ep;
+ int ret;
+
+ ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), 0, 0, 0);
+ if (!ep) {
+ dev_err(dev, "not connected to subdevice\n");
+ return -EINVAL;
+ }
+
+ ret = v4l2_fwnode_endpoint_parse(ep, &v4l2_ep);
+ if (ret) {
+ dev_err(dev, "could not parse v4l2 endpoint\n");
+ fwnode_handle_put(ep);
+ return -EINVAL;
+ }
+
+ fwnode = fwnode_graph_get_remote_endpoint(ep);
+ fwnode_handle_put(ep);
+
+ v4l2_async_subdev_nf_init(&csi->notifier, &csi->subdev);
+ csi->notifier.ops = &mei_csi_notify_ops;
+
+ asd = v4l2_async_nf_add_fwnode(&csi->notifier, fwnode,
+ struct v4l2_async_connection);
+ if (IS_ERR(asd)) {
+ fwnode_handle_put(fwnode);
+ return PTR_ERR(asd);
+ }
+
+ ret = v4l2_fwnode_endpoint_alloc_parse(fwnode, &v4l2_ep);
+ fwnode_handle_put(fwnode);
+ if (ret)
+ return ret;
+ csi->nr_of_lanes = v4l2_ep.bus.mipi_csi2.num_data_lanes;
+
+ ret = v4l2_async_nf_register(&csi->notifier);
+ if (ret)
+ v4l2_async_nf_cleanup(&csi->notifier);
+
+ v4l2_fwnode_endpoint_free(&v4l2_ep);
+
+ return ret;
+}
+
+static int mei_csi_probe(struct mei_cl_device *cldev,
+ const struct mei_cl_device_id *id)
+{
+ struct device *dev = &cldev->dev;
+ struct mei_csi *csi;
+ int ret;
+
+ if (!dev_fwnode(dev))
+ return -EPROBE_DEFER;
+
+ csi = devm_kzalloc(dev, sizeof(struct mei_csi), GFP_KERNEL);
+ if (!csi)
+ return -ENOMEM;
+
+ csi->cldev = cldev;
+ mutex_init(&csi->lock);
+ init_completion(&csi->cmd_completion);
+
+ mei_cldev_set_drvdata(cldev, csi);
+
+ ret = mei_cldev_enable(cldev);
+ if (ret < 0) {
+ dev_err(dev, "mei_cldev_enable failed: %d\n", ret);
+ goto destroy_mutex;
+ }
+
+ ret = mei_cldev_register_rx_cb(cldev, mei_csi_rx);
+ if (ret) {
+ dev_err(dev, "event cb registration failed: %d\n", ret);
+ goto err_disable;
+ }
+
+ ret = mei_csi_parse_firmware(csi);
+ if (ret)
+ goto err_disable;
+
+ csi->subdev.dev = &cldev->dev;
+ v4l2_subdev_init(&csi->subdev, &mei_csi_subdev_ops);
+ v4l2_set_subdevdata(&csi->subdev, csi);
+ csi->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE |
+ V4L2_SUBDEV_FL_HAS_EVENTS;
+ csi->subdev.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
+ csi->subdev.entity.ops = &mei_csi_entity_ops;
+
+ snprintf(csi->subdev.name, sizeof(csi->subdev.name),
+ MEI_CSI_ENTITY_NAME);
+
+ ret = mei_csi_init_controls(csi);
+ if (ret)
+ goto err_ctrl_handler;
+
+ csi->format_mbus[CSI_PAD_SOURCE] = mei_csi_format_mbus_default;
+ csi->format_mbus[CSI_PAD_SINK] = mei_csi_format_mbus_default;
+
+ csi->pads[CSI_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
+ csi->pads[CSI_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
+ ret = media_entity_pads_init(&csi->subdev.entity, CSI_NUM_PADS,
+ csi->pads);
+ if (ret)
+ goto err_ctrl_handler;
+
+ ret = v4l2_subdev_init_finalize(&csi->subdev);
+ if (ret < 0)
+ goto err_entity;
+
+ ret = v4l2_async_register_subdev(&csi->subdev);
+ if (ret < 0)
+ goto err_subdev;
+
+ pm_runtime_enable(&cldev->dev);
+
+ return 0;
+
+err_subdev:
+ v4l2_subdev_cleanup(&csi->subdev);
+
+err_entity:
+ media_entity_cleanup(&csi->subdev.entity);
+
+err_ctrl_handler:
+ v4l2_ctrl_handler_free(&csi->ctrl_handler);
+ v4l2_async_nf_unregister(&csi->notifier);
+ v4l2_async_nf_cleanup(&csi->notifier);
+
+err_disable:
+ mei_cldev_disable(cldev);
+
+destroy_mutex:
+ mutex_destroy(&csi->lock);
+
+ return ret;
+}
+
+static void mei_csi_remove(struct mei_cl_device *cldev)
+{
+ struct mei_csi *csi = mei_cldev_get_drvdata(cldev);
+
+ v4l2_async_nf_unregister(&csi->notifier);
+ v4l2_async_nf_cleanup(&csi->notifier);
+ v4l2_ctrl_handler_free(&csi->ctrl_handler);
+ v4l2_async_unregister_subdev(&csi->subdev);
+ v4l2_subdev_cleanup(&csi->subdev);
+ media_entity_cleanup(&csi->subdev.entity);
+
+ pm_runtime_disable(&cldev->dev);
+
+ mutex_destroy(&csi->lock);
+}
+
+#define MEI_CSI_UUID UUID_LE(0x92335FCF, 0x3203, 0x4472, \
+ 0xAF, 0x93, 0x7b, 0x44, 0x53, 0xAC, 0x29, 0xDA)
+
+static const struct mei_cl_device_id mei_csi_tbl[] = {
+ { MEI_CSI_DRIVER_NAME, MEI_CSI_UUID, MEI_CL_VERSION_ANY },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(mei, mei_csi_tbl);
+
+static struct mei_cl_driver mei_csi_driver = {
+ .id_table = mei_csi_tbl,
+ .name = MEI_CSI_DRIVER_NAME,
+
+ .probe = mei_csi_probe,
+ .remove = mei_csi_remove,
+};
+
+module_mei_cl_driver(mei_csi_driver);
+
+MODULE_AUTHOR("Wentong Wu <wentong.wu@intel.com>");
+MODULE_AUTHOR("Zhifeng Wang <zhifeng.wang@intel.com>");
+MODULE_DESCRIPTION("Device driver for IVSC CSI");
+MODULE_LICENSE("GPL");
projects / users / willy / xarray.git / commitdiff