diff options
Diffstat (limited to 'drivers/media/pci/intel/ivsc')
| -rw-r--r-- | drivers/media/pci/intel/ivsc/Kconfig | 12 | ||||
| -rw-r--r-- | drivers/media/pci/intel/ivsc/Makefile | 9 | ||||
| -rw-r--r-- | drivers/media/pci/intel/ivsc/mei_ace.c | 579 | ||||
| -rw-r--r-- | drivers/media/pci/intel/ivsc/mei_csi.c | 825 |
4 files changed, 1425 insertions, 0 deletions
diff --git a/drivers/media/pci/intel/ivsc/Kconfig b/drivers/media/pci/intel/ivsc/Kconfig new file mode 100644 index 000000000000..1ef1c4e3750d --- /dev/null +++ b/drivers/media/pci/intel/ivsc/Kconfig @@ -0,0 +1,12 @@ +# 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 + 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 000000000000..00fad29a6e6e --- /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 000000000000..a0491f307831 --- /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 000000000000..00ba611e0f68 --- /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 *)¬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"); |