From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/staging/most/video/Kconfig | 13 + drivers/staging/most/video/Makefile | 4 + drivers/staging/most/video/video.c | 584 ++++++++++++++++++++++++++++++++++++ 3 files changed, 601 insertions(+) create mode 100644 drivers/staging/most/video/Kconfig create mode 100644 drivers/staging/most/video/Makefile create mode 100644 drivers/staging/most/video/video.c (limited to 'drivers/staging/most/video') diff --git a/drivers/staging/most/video/Kconfig b/drivers/staging/most/video/Kconfig new file mode 100644 index 000000000..e16cc5e10 --- /dev/null +++ b/drivers/staging/most/video/Kconfig @@ -0,0 +1,13 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# MOST V4L2 configuration +# + +config MOST_VIDEO + tristate "Video" + depends on VIDEO_DEV + help + Say Y here if you want to commumicate via Video 4 Linux. + + To compile this driver as a module, choose M here: the + module will be called most_video. diff --git a/drivers/staging/most/video/Makefile b/drivers/staging/most/video/Makefile new file mode 100644 index 000000000..856175fec --- /dev/null +++ b/drivers/staging/most/video/Makefile @@ -0,0 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_MOST_VIDEO) += most_video.o + +most_video-objs := video.o diff --git a/drivers/staging/most/video/video.c b/drivers/staging/most/video/video.c new file mode 100644 index 000000000..ffa97ef21 --- /dev/null +++ b/drivers/staging/most/video/video.c @@ -0,0 +1,584 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * video.c - V4L2 component for Mostcore + * + * Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define V4L2_CMP_MAX_INPUT 1 + +static struct most_component comp; + +struct most_video_dev { + struct most_interface *iface; + int ch_idx; + struct list_head list; + bool mute; + + struct list_head pending_mbos; + spinlock_t list_lock; + + struct v4l2_device v4l2_dev; + atomic_t access_ref; + struct video_device *vdev; + unsigned int ctrl_input; + + struct mutex lock; + + wait_queue_head_t wait_data; +}; + +struct comp_fh { + /* must be the first field of this struct! */ + struct v4l2_fh fh; + struct most_video_dev *mdev; + u32 offs; +}; + +static LIST_HEAD(video_devices); +static DEFINE_SPINLOCK(list_lock); + +static inline bool data_ready(struct most_video_dev *mdev) +{ + return !list_empty(&mdev->pending_mbos); +} + +static inline struct mbo *get_top_mbo(struct most_video_dev *mdev) +{ + return list_first_entry(&mdev->pending_mbos, struct mbo, list); +} + +static int comp_vdev_open(struct file *filp) +{ + int ret; + struct video_device *vdev = video_devdata(filp); + struct most_video_dev *mdev = video_drvdata(filp); + struct comp_fh *fh; + + switch (vdev->vfl_type) { + case VFL_TYPE_VIDEO: + break; + default: + return -EINVAL; + } + + fh = kzalloc(sizeof(*fh), GFP_KERNEL); + if (!fh) + return -ENOMEM; + + if (!atomic_inc_and_test(&mdev->access_ref)) { + v4l2_err(&mdev->v4l2_dev, "too many clients\n"); + ret = -EBUSY; + goto err_dec; + } + + fh->mdev = mdev; + v4l2_fh_init(&fh->fh, vdev); + filp->private_data = fh; + + v4l2_fh_add(&fh->fh); + + ret = most_start_channel(mdev->iface, mdev->ch_idx, &comp); + if (ret) { + v4l2_err(&mdev->v4l2_dev, "most_start_channel() failed\n"); + goto err_rm; + } + + return 0; + +err_rm: + v4l2_fh_del(&fh->fh); + v4l2_fh_exit(&fh->fh); + +err_dec: + atomic_dec(&mdev->access_ref); + kfree(fh); + return ret; +} + +static int comp_vdev_close(struct file *filp) +{ + struct comp_fh *fh = filp->private_data; + struct most_video_dev *mdev = fh->mdev; + struct mbo *mbo, *tmp; + + /* + * We need to put MBOs back before we call most_stop_channel() + * to deallocate MBOs. + * From the other hand mostcore still calling rx_completion() + * to deliver MBOs until most_stop_channel() is called. + * Use mute to work around this issue. + * This must be implemented in core. + */ + + spin_lock_irq(&mdev->list_lock); + mdev->mute = true; + list_for_each_entry_safe(mbo, tmp, &mdev->pending_mbos, list) { + list_del(&mbo->list); + spin_unlock_irq(&mdev->list_lock); + most_put_mbo(mbo); + spin_lock_irq(&mdev->list_lock); + } + spin_unlock_irq(&mdev->list_lock); + most_stop_channel(mdev->iface, mdev->ch_idx, &comp); + mdev->mute = false; + + v4l2_fh_del(&fh->fh); + v4l2_fh_exit(&fh->fh); + + atomic_dec(&mdev->access_ref); + kfree(fh); + return 0; +} + +static ssize_t comp_vdev_read(struct file *filp, char __user *buf, + size_t count, loff_t *pos) +{ + struct comp_fh *fh = filp->private_data; + struct most_video_dev *mdev = fh->mdev; + int ret = 0; + + if (*pos) + return -ESPIPE; + + if (!mdev) + return -ENODEV; + + /* wait for the first buffer */ + if (!(filp->f_flags & O_NONBLOCK)) { + if (wait_event_interruptible(mdev->wait_data, data_ready(mdev))) + return -ERESTARTSYS; + } + + if (!data_ready(mdev)) + return -EAGAIN; + + while (count > 0 && data_ready(mdev)) { + struct mbo *const mbo = get_top_mbo(mdev); + int const rem = mbo->processed_length - fh->offs; + int const cnt = rem < count ? rem : count; + + if (copy_to_user(buf, mbo->virt_address + fh->offs, cnt)) { + v4l2_err(&mdev->v4l2_dev, "read: copy_to_user failed\n"); + if (!ret) + ret = -EFAULT; + return ret; + } + + fh->offs += cnt; + count -= cnt; + buf += cnt; + ret += cnt; + + if (cnt >= rem) { + fh->offs = 0; + spin_lock_irq(&mdev->list_lock); + list_del(&mbo->list); + spin_unlock_irq(&mdev->list_lock); + most_put_mbo(mbo); + } + } + return ret; +} + +static __poll_t comp_vdev_poll(struct file *filp, poll_table *wait) +{ + struct comp_fh *fh = filp->private_data; + struct most_video_dev *mdev = fh->mdev; + __poll_t mask = 0; + + /* only wait if no data is available */ + if (!data_ready(mdev)) + poll_wait(filp, &mdev->wait_data, wait); + if (data_ready(mdev)) + mask |= EPOLLIN | EPOLLRDNORM; + + return mask; +} + +static void comp_set_format_struct(struct v4l2_format *f) +{ + f->fmt.pix.width = 8; + f->fmt.pix.height = 8; + f->fmt.pix.pixelformat = V4L2_PIX_FMT_MPEG; + f->fmt.pix.bytesperline = 0; + f->fmt.pix.sizeimage = 188 * 2; + f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709; + f->fmt.pix.field = V4L2_FIELD_NONE; + f->fmt.pix.priv = 0; +} + +static int comp_set_format(struct most_video_dev *mdev, unsigned int cmd, + struct v4l2_format *format) +{ + if (format->fmt.pix.pixelformat != V4L2_PIX_FMT_MPEG) + return -EINVAL; + + if (cmd == VIDIOC_TRY_FMT) + return 0; + + comp_set_format_struct(format); + + return 0; +} + +static int vidioc_querycap(struct file *file, void *priv, + struct v4l2_capability *cap) +{ + struct comp_fh *fh = priv; + struct most_video_dev *mdev = fh->mdev; + + strscpy(cap->driver, "v4l2_component", sizeof(cap->driver)); + strscpy(cap->card, "MOST", sizeof(cap->card)); + snprintf(cap->bus_info, sizeof(cap->bus_info), + "%s", mdev->iface->description); + return 0; +} + +static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv, + struct v4l2_fmtdesc *f) +{ + if (f->index) + return -EINVAL; + + strscpy(f->description, "MPEG", sizeof(f->description)); + f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + f->flags = V4L2_FMT_FLAG_COMPRESSED; + f->pixelformat = V4L2_PIX_FMT_MPEG; + + return 0; +} + +static int vidioc_g_fmt_vid_cap(struct file *file, void *priv, + struct v4l2_format *f) +{ + comp_set_format_struct(f); + return 0; +} + +static int vidioc_try_fmt_vid_cap(struct file *file, void *priv, + struct v4l2_format *f) +{ + struct comp_fh *fh = priv; + struct most_video_dev *mdev = fh->mdev; + + return comp_set_format(mdev, VIDIOC_TRY_FMT, f); +} + +static int vidioc_s_fmt_vid_cap(struct file *file, void *priv, + struct v4l2_format *f) +{ + struct comp_fh *fh = priv; + struct most_video_dev *mdev = fh->mdev; + + return comp_set_format(mdev, VIDIOC_S_FMT, f); +} + +static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm) +{ + *norm = V4L2_STD_UNKNOWN; + return 0; +} + +static int vidioc_enum_input(struct file *file, void *priv, + struct v4l2_input *input) +{ + struct comp_fh *fh = priv; + struct most_video_dev *mdev = fh->mdev; + + if (input->index >= V4L2_CMP_MAX_INPUT) + return -EINVAL; + + strscpy(input->name, "MOST Video", sizeof(input->name)); + input->type |= V4L2_INPUT_TYPE_CAMERA; + input->audioset = 0; + + input->std = mdev->vdev->tvnorms; + + return 0; +} + +static int vidioc_g_input(struct file *file, void *priv, unsigned int *i) +{ + struct comp_fh *fh = priv; + struct most_video_dev *mdev = fh->mdev; + *i = mdev->ctrl_input; + return 0; +} + +static int vidioc_s_input(struct file *file, void *priv, unsigned int index) +{ + struct comp_fh *fh = priv; + struct most_video_dev *mdev = fh->mdev; + + if (index >= V4L2_CMP_MAX_INPUT) + return -EINVAL; + mdev->ctrl_input = index; + return 0; +} + +static const struct v4l2_file_operations comp_fops = { + .owner = THIS_MODULE, + .open = comp_vdev_open, + .release = comp_vdev_close, + .read = comp_vdev_read, + .poll = comp_vdev_poll, + .unlocked_ioctl = video_ioctl2, +}; + +static const struct v4l2_ioctl_ops video_ioctl_ops = { + .vidioc_querycap = vidioc_querycap, + .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap, + .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap, + .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap, + .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap, + .vidioc_g_std = vidioc_g_std, + .vidioc_enum_input = vidioc_enum_input, + .vidioc_g_input = vidioc_g_input, + .vidioc_s_input = vidioc_s_input, +}; + +static const struct video_device comp_videodev_template = { + .fops = &comp_fops, + .release = video_device_release, + .ioctl_ops = &video_ioctl_ops, + .tvnorms = V4L2_STD_UNKNOWN, + .device_caps = V4L2_CAP_READWRITE | V4L2_CAP_VIDEO_CAPTURE, +}; + +/**************************************************************************/ + +static struct most_video_dev *get_comp_dev( + struct most_interface *iface, int channel_idx) +{ + struct most_video_dev *mdev; + unsigned long flags; + + spin_lock_irqsave(&list_lock, flags); + list_for_each_entry(mdev, &video_devices, list) { + if (mdev->iface == iface && mdev->ch_idx == channel_idx) { + spin_unlock_irqrestore(&list_lock, flags); + return mdev; + } + } + spin_unlock_irqrestore(&list_lock, flags); + return NULL; +} + +static int comp_rx_data(struct mbo *mbo) +{ + unsigned long flags; + struct most_video_dev *mdev = + get_comp_dev(mbo->ifp, mbo->hdm_channel_id); + + if (!mdev) + return -EIO; + + spin_lock_irqsave(&mdev->list_lock, flags); + if (unlikely(mdev->mute)) { + spin_unlock_irqrestore(&mdev->list_lock, flags); + return -EIO; + } + + list_add_tail(&mbo->list, &mdev->pending_mbos); + spin_unlock_irqrestore(&mdev->list_lock, flags); + wake_up_interruptible(&mdev->wait_data); + return 0; +} + +static int comp_register_videodev(struct most_video_dev *mdev) +{ + int ret; + + init_waitqueue_head(&mdev->wait_data); + + /* allocate and fill v4l2 video struct */ + mdev->vdev = video_device_alloc(); + if (!mdev->vdev) + return -ENOMEM; + + /* Fill the video capture device struct */ + *mdev->vdev = comp_videodev_template; + mdev->vdev->v4l2_dev = &mdev->v4l2_dev; + mdev->vdev->lock = &mdev->lock; + snprintf(mdev->vdev->name, sizeof(mdev->vdev->name), "MOST: %s", + mdev->v4l2_dev.name); + + /* Register the v4l2 device */ + video_set_drvdata(mdev->vdev, mdev); + ret = video_register_device(mdev->vdev, VFL_TYPE_VIDEO, -1); + if (ret) { + v4l2_err(&mdev->v4l2_dev, "video_register_device failed (%d)\n", + ret); + video_device_release(mdev->vdev); + } + + return ret; +} + +static void comp_unregister_videodev(struct most_video_dev *mdev) +{ + video_unregister_device(mdev->vdev); +} + +static void comp_v4l2_dev_release(struct v4l2_device *v4l2_dev) +{ + struct most_video_dev *mdev = + container_of(v4l2_dev, struct most_video_dev, v4l2_dev); + + v4l2_device_unregister(v4l2_dev); + kfree(mdev); +} + +static int comp_probe_channel(struct most_interface *iface, int channel_idx, + struct most_channel_config *ccfg, char *name, + char *args) +{ + int ret; + struct most_video_dev *mdev = get_comp_dev(iface, channel_idx); + + if (mdev) { + pr_err("channel already linked\n"); + return -EEXIST; + } + + if (ccfg->direction != MOST_CH_RX) { + pr_err("wrong direction, expect rx\n"); + return -EINVAL; + } + + if (ccfg->data_type != MOST_CH_SYNC && + ccfg->data_type != MOST_CH_ISOC) { + pr_err("wrong channel type, expect sync or isoc\n"); + return -EINVAL; + } + + mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); + if (!mdev) + return -ENOMEM; + + mutex_init(&mdev->lock); + atomic_set(&mdev->access_ref, -1); + spin_lock_init(&mdev->list_lock); + INIT_LIST_HEAD(&mdev->pending_mbos); + mdev->iface = iface; + mdev->ch_idx = channel_idx; + mdev->v4l2_dev.release = comp_v4l2_dev_release; + + /* Create the v4l2_device */ + strscpy(mdev->v4l2_dev.name, name, sizeof(mdev->v4l2_dev.name)); + ret = v4l2_device_register(NULL, &mdev->v4l2_dev); + if (ret) { + pr_err("v4l2_device_register() failed\n"); + kfree(mdev); + return ret; + } + + ret = comp_register_videodev(mdev); + if (ret) + goto err_unreg; + + spin_lock_irq(&list_lock); + list_add(&mdev->list, &video_devices); + spin_unlock_irq(&list_lock); + return 0; + +err_unreg: + v4l2_device_disconnect(&mdev->v4l2_dev); + v4l2_device_put(&mdev->v4l2_dev); + return ret; +} + +static int comp_disconnect_channel(struct most_interface *iface, + int channel_idx) +{ + struct most_video_dev *mdev = get_comp_dev(iface, channel_idx); + + if (!mdev) { + pr_err("no such channel is linked\n"); + return -ENOENT; + } + + spin_lock_irq(&list_lock); + list_del(&mdev->list); + spin_unlock_irq(&list_lock); + + comp_unregister_videodev(mdev); + v4l2_device_disconnect(&mdev->v4l2_dev); + v4l2_device_put(&mdev->v4l2_dev); + return 0; +} + +static struct most_component comp = { + .mod = THIS_MODULE, + .name = "video", + .probe_channel = comp_probe_channel, + .disconnect_channel = comp_disconnect_channel, + .rx_completion = comp_rx_data, +}; + +static int __init comp_init(void) +{ + int err; + + err = most_register_component(&comp); + if (err) + return err; + err = most_register_configfs_subsys(&comp); + if (err) { + most_deregister_component(&comp); + return err; + } + return 0; +} + +static void __exit comp_exit(void) +{ + struct most_video_dev *mdev, *tmp; + + /* + * As the mostcore currently doesn't call disconnect_channel() + * for linked channels while we call most_deregister_component() + * we simulate this call here. + * This must be fixed in core. + */ + spin_lock_irq(&list_lock); + list_for_each_entry_safe(mdev, tmp, &video_devices, list) { + list_del(&mdev->list); + spin_unlock_irq(&list_lock); + + comp_unregister_videodev(mdev); + v4l2_device_disconnect(&mdev->v4l2_dev); + v4l2_device_put(&mdev->v4l2_dev); + spin_lock_irq(&list_lock); + } + spin_unlock_irq(&list_lock); + + most_deregister_configfs_subsys(&comp); + most_deregister_component(&comp); + BUG_ON(!list_empty(&video_devices)); +} + +module_init(comp_init); +module_exit(comp_exit); + +MODULE_DESCRIPTION("V4L2 Component Module for Mostcore"); +MODULE_AUTHOR("Andrey Shvetsov "); +MODULE_LICENSE("GPL"); -- cgit v1.2.3