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-rw-r--r--drivers/media/pci/intel/ivsc/Kconfig15
-rw-r--r--drivers/media/pci/intel/ivsc/Makefile9
-rw-r--r--drivers/media/pci/intel/ivsc/mei_ace.c579
-rw-r--r--drivers/media/pci/intel/ivsc/mei_csi.c825
4 files changed, 1428 insertions, 0 deletions
diff --git a/drivers/media/pci/intel/ivsc/Kconfig b/drivers/media/pci/intel/ivsc/Kconfig
new file mode 100644
index 0000000000..a8cb981544
--- /dev/null
+++ b/drivers/media/pci/intel/ivsc/Kconfig
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Copyright (C) 2023, Intel Corporation. All rights reserved.
+
+config INTEL_VSC
+ tristate "Intel Visual Sensing Controller"
+ depends on INTEL_MEI && ACPI && VIDEO_DEV
+ select MEDIA_CONTROLLER
+ select VIDEO_V4L2_SUBDEV_API
+ select V4L2_FWNODE
+ help
+ This adds support for Intel Visual Sensing Controller (IVSC).
+
+ Enables the IVSC firmware services required for controlling
+ camera sensor ownership and CSI-2 link through Image Processing
+ Unit(IPU) driver of Intel.
diff --git a/drivers/media/pci/intel/ivsc/Makefile b/drivers/media/pci/intel/ivsc/Makefile
new file mode 100644
index 0000000000..00fad29a6e
--- /dev/null
+++ b/drivers/media/pci/intel/ivsc/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Copyright (C) 2023, Intel Corporation. All rights reserved.
+
+obj-$(CONFIG_INTEL_VSC) += ivsc-csi.o
+ivsc-csi-y += mei_csi.o
+
+obj-$(CONFIG_INTEL_VSC) += ivsc-ace.o
+ivsc-ace-y += mei_ace.o
diff --git a/drivers/media/pci/intel/ivsc/mei_ace.c b/drivers/media/pci/intel/ivsc/mei_ace.c
new file mode 100644
index 0000000000..a0491f3078
--- /dev/null
+++ b/drivers/media/pci/intel/ivsc/mei_ace.c
@@ -0,0 +1,579 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2023 Intel Corporation. All rights reserved.
+ * Intel Visual Sensing Controller ACE Linux driver
+ */
+
+/*
+ * To set ownership of camera sensor, there is specific command, which
+ * is sent via MEI protocol. That's a two-step scheme where the firmware
+ * first acks receipt of the command and later responses the command was
+ * executed. The command sending function uses "completion" as the
+ * synchronization mechanism. The notification for command is received
+ * via a mei callback which wakes up the caller. There can be only one
+ * outstanding command at a time.
+ *
+ * The power line of camera sensor is directly connected to IVSC instead
+ * of host, when camera sensor ownership is switched to host, sensor is
+ * already powered up by firmware.
+ */
+
+#include <linux/acpi.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/kernel.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/uuid.h>
+#include <linux/workqueue.h>
+
+#define MEI_ACE_DRIVER_NAME "ivsc_ace"
+
+/* indicating driver message */
+#define ACE_DRV_MSG 1
+/* indicating set command */
+#define ACE_CMD_SET 4
+/* command timeout determined experimentally */
+#define ACE_CMD_TIMEOUT (5 * HZ)
+/* indicating the first command block */
+#define ACE_CMD_INIT_BLOCK 1
+/* indicating the last command block */
+#define ACE_CMD_FINAL_BLOCK 1
+/* size of camera status notification content */
+#define ACE_CAMERA_STATUS_SIZE 5
+
+/* UUID used to get firmware id */
+#define ACE_GET_FW_ID_UUID UUID_LE(0x6167DCFB, 0x72F1, 0x4584, 0xBF, \
+ 0xE3, 0x84, 0x17, 0x71, 0xAA, 0x79, 0x0B)
+
+/* UUID used to get csi device */
+#define MEI_CSI_UUID UUID_LE(0x92335FCF, 0x3203, 0x4472, \
+ 0xAF, 0x93, 0x7b, 0x44, 0x53, 0xAC, 0x29, 0xDA)
+
+/* identify firmware event type */
+enum ace_event_type {
+ /* firmware ready */
+ ACE_FW_READY = 0x8,
+
+ /* command response */
+ ACE_CMD_RESPONSE = 0x10,
+};
+
+/* identify camera sensor ownership */
+enum ace_camera_owner {
+ ACE_CAMERA_IVSC,
+ ACE_CAMERA_HOST,
+};
+
+/* identify the command id supported by firmware IPC */
+enum ace_cmd_id {
+ /* used to switch camera sensor to host */
+ ACE_SWITCH_CAMERA_TO_HOST = 0x13,
+
+ /* used to switch camera sensor to IVSC */
+ ACE_SWITCH_CAMERA_TO_IVSC = 0x14,
+
+ /* used to get firmware id */
+ ACE_GET_FW_ID = 0x1A,
+};
+
+/* ACE command header structure */
+struct ace_cmd_hdr {
+ u32 firmware_id : 16;
+ u32 instance_id : 8;
+ u32 type : 5;
+ u32 rsp : 1;
+ u32 msg_tgt : 1;
+ u32 _hw_rsvd_1 : 1;
+ u32 param_size : 20;
+ u32 cmd_id : 8;
+ u32 final_block : 1;
+ u32 init_block : 1;
+ u32 _hw_rsvd_2 : 2;
+} __packed;
+
+/* ACE command parameter structure */
+union ace_cmd_param {
+ uuid_le uuid;
+ u32 param;
+};
+
+/* ACE command structure */
+struct ace_cmd {
+ struct ace_cmd_hdr hdr;
+ union ace_cmd_param param;
+} __packed;
+
+/* ACE notification header */
+union ace_notif_hdr {
+ struct _confirm {
+ u32 status : 24;
+ u32 type : 5;
+ u32 rsp : 1;
+ u32 msg_tgt : 1;
+ u32 _hw_rsvd_1 : 1;
+ u32 param_size : 20;
+ u32 cmd_id : 8;
+ u32 final_block : 1;
+ u32 init_block : 1;
+ u32 _hw_rsvd_2 : 2;
+ } __packed ack;
+
+ struct _event {
+ u32 rsvd1 : 16;
+ u32 event_type : 8;
+ u32 type : 5;
+ u32 ack : 1;
+ u32 msg_tgt : 1;
+ u32 _hw_rsvd_1 : 1;
+ u32 rsvd2 : 30;
+ u32 _hw_rsvd_2 : 2;
+ } __packed event;
+
+ struct _response {
+ u32 event_id : 16;
+ u32 notif_type : 8;
+ u32 type : 5;
+ u32 rsp : 1;
+ u32 msg_tgt : 1;
+ u32 _hw_rsvd_1 : 1;
+ u32 event_data_size : 16;
+ u32 request_target : 1;
+ u32 request_type : 5;
+ u32 cmd_id : 8;
+ u32 _hw_rsvd_2 : 2;
+ } __packed response;
+};
+
+/* ACE notification content */
+union ace_notif_cont {
+ u16 firmware_id;
+ u8 state_notif;
+ u8 camera_status[ACE_CAMERA_STATUS_SIZE];
+};
+
+/* ACE notification structure */
+struct ace_notif {
+ union ace_notif_hdr hdr;
+ union ace_notif_cont cont;
+} __packed;
+
+struct mei_ace {
+ struct mei_cl_device *cldev;
+
+ /* command ack */
+ struct ace_notif cmd_ack;
+ /* command response */
+ struct ace_notif cmd_response;
+ /* used to wait for command ack and response */
+ struct completion cmd_completion;
+ /* lock used to prevent multiple call to send command */
+ struct mutex lock;
+
+ /* used to construct command */
+ u16 firmware_id;
+
+ struct device *csi_dev;
+
+ /* runtime PM link from ace to csi */
+ struct device_link *csi_link;
+
+ struct work_struct work;
+};
+
+static inline void init_cmd_hdr(struct ace_cmd_hdr *hdr)
+{
+ memset(hdr, 0, sizeof(struct ace_cmd_hdr));
+
+ hdr->type = ACE_CMD_SET;
+ hdr->msg_tgt = ACE_DRV_MSG;
+ hdr->init_block = ACE_CMD_INIT_BLOCK;
+ hdr->final_block = ACE_CMD_FINAL_BLOCK;
+}
+
+static int construct_command(struct mei_ace *ace, struct ace_cmd *cmd,
+ enum ace_cmd_id cmd_id)
+{
+ union ace_cmd_param *param = &cmd->param;
+ struct ace_cmd_hdr *hdr = &cmd->hdr;
+
+ init_cmd_hdr(hdr);
+
+ hdr->cmd_id = cmd_id;
+ switch (cmd_id) {
+ case ACE_GET_FW_ID:
+ param->uuid = ACE_GET_FW_ID_UUID;
+ hdr->param_size = sizeof(param->uuid);
+ break;
+ case ACE_SWITCH_CAMERA_TO_IVSC:
+ param->param = 0;
+ hdr->firmware_id = ace->firmware_id;
+ hdr->param_size = sizeof(param->param);
+ break;
+ case ACE_SWITCH_CAMERA_TO_HOST:
+ hdr->firmware_id = ace->firmware_id;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return hdr->param_size + sizeof(cmd->hdr);
+}
+
+/* send command to firmware */
+static int mei_ace_send(struct mei_ace *ace, struct ace_cmd *cmd,
+ size_t len, bool only_ack)
+{
+ union ace_notif_hdr *resp_hdr = &ace->cmd_response.hdr;
+ union ace_notif_hdr *ack_hdr = &ace->cmd_ack.hdr;
+ struct ace_cmd_hdr *cmd_hdr = &cmd->hdr;
+ int ret;
+
+ mutex_lock(&ace->lock);
+
+ reinit_completion(&ace->cmd_completion);
+
+ ret = mei_cldev_send(ace->cldev, (u8 *)cmd, len);
+ if (ret < 0)
+ goto out;
+
+ ret = wait_for_completion_killable_timeout(&ace->cmd_completion,
+ ACE_CMD_TIMEOUT);
+ if (ret < 0) {
+ goto out;
+ } else if (!ret) {
+ ret = -ETIMEDOUT;
+ goto out;
+ }
+
+ if (ack_hdr->ack.cmd_id != cmd_hdr->cmd_id) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* command ack status */
+ ret = ack_hdr->ack.status;
+ if (ret) {
+ ret = -EIO;
+ goto out;
+ }
+
+ if (only_ack)
+ goto out;
+
+ ret = wait_for_completion_killable_timeout(&ace->cmd_completion,
+ ACE_CMD_TIMEOUT);
+ if (ret < 0) {
+ goto out;
+ } else if (!ret) {
+ ret = -ETIMEDOUT;
+ goto out;
+ } else {
+ ret = 0;
+ }
+
+ if (resp_hdr->response.cmd_id != cmd_hdr->cmd_id)
+ ret = -EINVAL;
+
+out:
+ mutex_unlock(&ace->lock);
+
+ return ret;
+}
+
+static int ace_set_camera_owner(struct mei_ace *ace,
+ enum ace_camera_owner owner)
+{
+ enum ace_cmd_id cmd_id;
+ struct ace_cmd cmd;
+ int cmd_size;
+ int ret;
+
+ if (owner == ACE_CAMERA_IVSC)
+ cmd_id = ACE_SWITCH_CAMERA_TO_IVSC;
+ else
+ cmd_id = ACE_SWITCH_CAMERA_TO_HOST;
+
+ cmd_size = construct_command(ace, &cmd, cmd_id);
+ if (cmd_size >= 0)
+ ret = mei_ace_send(ace, &cmd, cmd_size, false);
+ else
+ ret = cmd_size;
+
+ return ret;
+}
+
+/* the first command downloaded to firmware */
+static inline int ace_get_firmware_id(struct mei_ace *ace)
+{
+ struct ace_cmd cmd;
+ int cmd_size;
+ int ret;
+
+ cmd_size = construct_command(ace, &cmd, ACE_GET_FW_ID);
+ if (cmd_size >= 0)
+ ret = mei_ace_send(ace, &cmd, cmd_size, true);
+ else
+ ret = cmd_size;
+
+ return ret;
+}
+
+static void handle_command_response(struct mei_ace *ace,
+ struct ace_notif *resp, int len)
+{
+ union ace_notif_hdr *hdr = &resp->hdr;
+
+ switch (hdr->response.cmd_id) {
+ case ACE_SWITCH_CAMERA_TO_IVSC:
+ case ACE_SWITCH_CAMERA_TO_HOST:
+ memcpy(&ace->cmd_response, resp, len);
+ complete(&ace->cmd_completion);
+ break;
+ case ACE_GET_FW_ID:
+ break;
+ default:
+ break;
+ }
+}
+
+static void handle_command_ack(struct mei_ace *ace,
+ struct ace_notif *ack, int len)
+{
+ union ace_notif_hdr *hdr = &ack->hdr;
+
+ switch (hdr->ack.cmd_id) {
+ case ACE_GET_FW_ID:
+ ace->firmware_id = ack->cont.firmware_id;
+ fallthrough;
+ case ACE_SWITCH_CAMERA_TO_IVSC:
+ case ACE_SWITCH_CAMERA_TO_HOST:
+ memcpy(&ace->cmd_ack, ack, len);
+ complete(&ace->cmd_completion);
+ break;
+ default:
+ break;
+ }
+}
+
+/* callback for receive */
+static void mei_ace_rx(struct mei_cl_device *cldev)
+{
+ struct mei_ace *ace = mei_cldev_get_drvdata(cldev);
+ struct ace_notif event;
+ union ace_notif_hdr *hdr = &event.hdr;
+ int ret;
+
+ ret = mei_cldev_recv(cldev, (u8 *)&event, sizeof(event));
+ if (ret < 0) {
+ dev_err(&cldev->dev, "recv error: %d\n", ret);
+ return;
+ }
+
+ if (hdr->event.ack) {
+ handle_command_ack(ace, &event, ret);
+ return;
+ }
+
+ switch (hdr->event.event_type) {
+ case ACE_CMD_RESPONSE:
+ handle_command_response(ace, &event, ret);
+ break;
+ case ACE_FW_READY:
+ /*
+ * firmware ready notification sent to driver
+ * after HECI client connected with firmware.
+ */
+ dev_dbg(&cldev->dev, "firmware ready\n");
+ break;
+ default:
+ break;
+ }
+}
+
+static int mei_ace_setup_dev_link(struct mei_ace *ace)
+{
+ struct device *dev = &ace->cldev->dev;
+ uuid_le uuid = MEI_CSI_UUID;
+ struct device *csi_dev;
+ char name[64];
+ int ret;
+
+ snprintf(name, sizeof(name), "%s-%pUl", dev_name(dev->parent), &uuid);
+
+ csi_dev = device_find_child_by_name(dev->parent, name);
+ if (!csi_dev) {
+ ret = -EPROBE_DEFER;
+ goto err;
+ }
+
+ /* setup link between mei_ace and mei_csi */
+ ace->csi_link = device_link_add(csi_dev, dev, DL_FLAG_PM_RUNTIME |
+ DL_FLAG_RPM_ACTIVE | DL_FLAG_STATELESS);
+ if (!ace->csi_link) {
+ ret = -EINVAL;
+ dev_err(dev, "failed to link to %s\n", dev_name(csi_dev));
+ goto err_put;
+ }
+
+ ace->csi_dev = csi_dev;
+
+ return 0;
+
+err_put:
+ put_device(csi_dev);
+
+err:
+ return ret;
+}
+
+/* switch camera to host before probe sensor device */
+static void mei_ace_post_probe_work(struct work_struct *work)
+{
+ struct acpi_device *adev;
+ struct mei_ace *ace;
+ struct device *dev;
+ int ret;
+
+ ace = container_of(work, struct mei_ace, work);
+ dev = &ace->cldev->dev;
+
+ ret = ace_set_camera_owner(ace, ACE_CAMERA_HOST);
+ if (ret) {
+ dev_err(dev, "switch camera to host failed: %d\n", ret);
+ return;
+ }
+
+ adev = ACPI_COMPANION(dev->parent);
+ if (!adev)
+ return;
+
+ acpi_dev_clear_dependencies(adev);
+}
+
+static int mei_ace_probe(struct mei_cl_device *cldev,
+ const struct mei_cl_device_id *id)
+{
+ struct device *dev = &cldev->dev;
+ struct mei_ace *ace;
+ int ret;
+
+ ace = devm_kzalloc(dev, sizeof(struct mei_ace), GFP_KERNEL);
+ if (!ace)
+ return -ENOMEM;
+
+ ace->cldev = cldev;
+ mutex_init(&ace->lock);
+ init_completion(&ace->cmd_completion);
+ INIT_WORK(&ace->work, mei_ace_post_probe_work);
+
+ mei_cldev_set_drvdata(cldev, ace);
+
+ 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_ace_rx);
+ if (ret) {
+ dev_err(dev, "event cb registration failed: %d\n", ret);
+ goto err_disable;
+ }
+
+ ret = ace_get_firmware_id(ace);
+ if (ret) {
+ dev_err(dev, "get firmware id failed: %d\n", ret);
+ goto err_disable;
+ }
+
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+
+ ret = mei_ace_setup_dev_link(ace);
+ if (ret)
+ goto disable_pm;
+
+ schedule_work(&ace->work);
+
+ return 0;
+
+disable_pm:
+ pm_runtime_disable(dev);
+ pm_runtime_set_suspended(dev);
+
+err_disable:
+ mei_cldev_disable(cldev);
+
+destroy_mutex:
+ mutex_destroy(&ace->lock);
+
+ return ret;
+}
+
+static void mei_ace_remove(struct mei_cl_device *cldev)
+{
+ struct mei_ace *ace = mei_cldev_get_drvdata(cldev);
+
+ cancel_work_sync(&ace->work);
+
+ device_link_del(ace->csi_link);
+ put_device(ace->csi_dev);
+
+ pm_runtime_disable(&cldev->dev);
+ pm_runtime_set_suspended(&cldev->dev);
+
+ ace_set_camera_owner(ace, ACE_CAMERA_IVSC);
+
+ mutex_destroy(&ace->lock);
+}
+
+static int __maybe_unused mei_ace_runtime_suspend(struct device *dev)
+{
+ struct mei_ace *ace = dev_get_drvdata(dev);
+
+ return ace_set_camera_owner(ace, ACE_CAMERA_IVSC);
+}
+
+static int __maybe_unused mei_ace_runtime_resume(struct device *dev)
+{
+ struct mei_ace *ace = dev_get_drvdata(dev);
+
+ return ace_set_camera_owner(ace, ACE_CAMERA_HOST);
+}
+
+static const struct dev_pm_ops mei_ace_pm_ops = {
+ SET_RUNTIME_PM_OPS(mei_ace_runtime_suspend,
+ mei_ace_runtime_resume, NULL)
+};
+
+#define MEI_ACE_UUID UUID_LE(0x5DB76CF6, 0x0A68, 0x4ED6, \
+ 0x9B, 0x78, 0x03, 0x61, 0x63, 0x5E, 0x24, 0x47)
+
+static const struct mei_cl_device_id mei_ace_tbl[] = {
+ { MEI_ACE_DRIVER_NAME, MEI_ACE_UUID, MEI_CL_VERSION_ANY },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(mei, mei_ace_tbl);
+
+static struct mei_cl_driver mei_ace_driver = {
+ .id_table = mei_ace_tbl,
+ .name = MEI_ACE_DRIVER_NAME,
+
+ .probe = mei_ace_probe,
+ .remove = mei_ace_remove,
+
+ .driver = {
+ .pm = &mei_ace_pm_ops,
+ },
+};
+
+module_mei_cl_driver(mei_ace_driver);
+
+MODULE_AUTHOR("Wentong Wu <wentong.wu@intel.com>");
+MODULE_AUTHOR("Zhifeng Wang <zhifeng.wang@intel.com>");
+MODULE_DESCRIPTION("Device driver for IVSC ACE");
+MODULE_LICENSE("GPL");
diff --git a/drivers/media/pci/intel/ivsc/mei_csi.c b/drivers/media/pci/intel/ivsc/mei_csi.c
new file mode 100644
index 0000000000..00ba611e0f
--- /dev/null
+++ b/drivers/media/pci/intel/ivsc/mei_csi.c
@@ -0,0 +1,825 @@
+// 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 *)&notif, 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, &notif, 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");