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/usb/host/xhci-dbgtty.c | 582 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 582 insertions(+) create mode 100644 drivers/usb/host/xhci-dbgtty.c (limited to 'drivers/usb/host/xhci-dbgtty.c') diff --git a/drivers/usb/host/xhci-dbgtty.c b/drivers/usb/host/xhci-dbgtty.c new file mode 100644 index 000000000..d3acc0829 --- /dev/null +++ b/drivers/usb/host/xhci-dbgtty.c @@ -0,0 +1,582 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * xhci-dbgtty.c - tty glue for xHCI debug capability + * + * Copyright (C) 2017 Intel Corporation + * + * Author: Lu Baolu + */ + +#include +#include +#include +#include + +#include "xhci.h" +#include "xhci-dbgcap.h" + +static struct tty_driver *dbc_tty_driver; +static struct idr dbc_tty_minors; +static DEFINE_MUTEX(dbc_tty_minors_lock); + +static inline struct dbc_port *dbc_to_port(struct xhci_dbc *dbc) +{ + return dbc->priv; +} + +static unsigned int +dbc_send_packet(struct dbc_port *port, char *packet, unsigned int size) +{ + unsigned int len; + + len = kfifo_len(&port->write_fifo); + if (len < size) + size = len; + if (size != 0) + size = kfifo_out(&port->write_fifo, packet, size); + return size; +} + +static int dbc_start_tx(struct dbc_port *port) + __releases(&port->port_lock) + __acquires(&port->port_lock) +{ + int len; + struct dbc_request *req; + int status = 0; + bool do_tty_wake = false; + struct list_head *pool = &port->write_pool; + + while (!list_empty(pool)) { + req = list_entry(pool->next, struct dbc_request, list_pool); + len = dbc_send_packet(port, req->buf, DBC_MAX_PACKET); + if (len == 0) + break; + do_tty_wake = true; + + req->length = len; + list_del(&req->list_pool); + + spin_unlock(&port->port_lock); + status = dbc_ep_queue(req); + spin_lock(&port->port_lock); + + if (status) { + list_add(&req->list_pool, pool); + break; + } + } + + if (do_tty_wake && port->port.tty) + tty_wakeup(port->port.tty); + + return status; +} + +static void dbc_start_rx(struct dbc_port *port) + __releases(&port->port_lock) + __acquires(&port->port_lock) +{ + struct dbc_request *req; + int status; + struct list_head *pool = &port->read_pool; + + while (!list_empty(pool)) { + if (!port->port.tty) + break; + + req = list_entry(pool->next, struct dbc_request, list_pool); + list_del(&req->list_pool); + req->length = DBC_MAX_PACKET; + + spin_unlock(&port->port_lock); + status = dbc_ep_queue(req); + spin_lock(&port->port_lock); + + if (status) { + list_add(&req->list_pool, pool); + break; + } + } +} + +static void +dbc_read_complete(struct xhci_dbc *dbc, struct dbc_request *req) +{ + unsigned long flags; + struct dbc_port *port = dbc_to_port(dbc); + + spin_lock_irqsave(&port->port_lock, flags); + list_add_tail(&req->list_pool, &port->read_queue); + tasklet_schedule(&port->push); + spin_unlock_irqrestore(&port->port_lock, flags); +} + +static void dbc_write_complete(struct xhci_dbc *dbc, struct dbc_request *req) +{ + unsigned long flags; + struct dbc_port *port = dbc_to_port(dbc); + + spin_lock_irqsave(&port->port_lock, flags); + list_add(&req->list_pool, &port->write_pool); + switch (req->status) { + case 0: + dbc_start_tx(port); + break; + case -ESHUTDOWN: + break; + default: + dev_warn(dbc->dev, "unexpected write complete status %d\n", + req->status); + break; + } + spin_unlock_irqrestore(&port->port_lock, flags); +} + +static void xhci_dbc_free_req(struct dbc_request *req) +{ + kfree(req->buf); + dbc_free_request(req); +} + +static int +xhci_dbc_alloc_requests(struct xhci_dbc *dbc, unsigned int direction, + struct list_head *head, + void (*fn)(struct xhci_dbc *, struct dbc_request *)) +{ + int i; + struct dbc_request *req; + + for (i = 0; i < DBC_QUEUE_SIZE; i++) { + req = dbc_alloc_request(dbc, direction, GFP_KERNEL); + if (!req) + break; + + req->length = DBC_MAX_PACKET; + req->buf = kmalloc(req->length, GFP_KERNEL); + if (!req->buf) { + dbc_free_request(req); + break; + } + + req->complete = fn; + list_add_tail(&req->list_pool, head); + } + + return list_empty(head) ? -ENOMEM : 0; +} + +static void +xhci_dbc_free_requests(struct list_head *head) +{ + struct dbc_request *req; + + while (!list_empty(head)) { + req = list_entry(head->next, struct dbc_request, list_pool); + list_del(&req->list_pool); + xhci_dbc_free_req(req); + } +} + +static int dbc_tty_install(struct tty_driver *driver, struct tty_struct *tty) +{ + struct dbc_port *port; + + mutex_lock(&dbc_tty_minors_lock); + port = idr_find(&dbc_tty_minors, tty->index); + mutex_unlock(&dbc_tty_minors_lock); + + if (!port) + return -ENXIO; + + tty->driver_data = port; + + return tty_port_install(&port->port, driver, tty); +} + +static int dbc_tty_open(struct tty_struct *tty, struct file *file) +{ + struct dbc_port *port = tty->driver_data; + + return tty_port_open(&port->port, tty, file); +} + +static void dbc_tty_close(struct tty_struct *tty, struct file *file) +{ + struct dbc_port *port = tty->driver_data; + + tty_port_close(&port->port, tty, file); +} + +static int dbc_tty_write(struct tty_struct *tty, + const unsigned char *buf, + int count) +{ + struct dbc_port *port = tty->driver_data; + unsigned long flags; + + spin_lock_irqsave(&port->port_lock, flags); + if (count) + count = kfifo_in(&port->write_fifo, buf, count); + dbc_start_tx(port); + spin_unlock_irqrestore(&port->port_lock, flags); + + return count; +} + +static int dbc_tty_put_char(struct tty_struct *tty, unsigned char ch) +{ + struct dbc_port *port = tty->driver_data; + unsigned long flags; + int status; + + spin_lock_irqsave(&port->port_lock, flags); + status = kfifo_put(&port->write_fifo, ch); + spin_unlock_irqrestore(&port->port_lock, flags); + + return status; +} + +static void dbc_tty_flush_chars(struct tty_struct *tty) +{ + struct dbc_port *port = tty->driver_data; + unsigned long flags; + + spin_lock_irqsave(&port->port_lock, flags); + dbc_start_tx(port); + spin_unlock_irqrestore(&port->port_lock, flags); +} + +static unsigned int dbc_tty_write_room(struct tty_struct *tty) +{ + struct dbc_port *port = tty->driver_data; + unsigned long flags; + unsigned int room; + + spin_lock_irqsave(&port->port_lock, flags); + room = kfifo_avail(&port->write_fifo); + spin_unlock_irqrestore(&port->port_lock, flags); + + return room; +} + +static unsigned int dbc_tty_chars_in_buffer(struct tty_struct *tty) +{ + struct dbc_port *port = tty->driver_data; + unsigned long flags; + unsigned int chars; + + spin_lock_irqsave(&port->port_lock, flags); + chars = kfifo_len(&port->write_fifo); + spin_unlock_irqrestore(&port->port_lock, flags); + + return chars; +} + +static void dbc_tty_unthrottle(struct tty_struct *tty) +{ + struct dbc_port *port = tty->driver_data; + unsigned long flags; + + spin_lock_irqsave(&port->port_lock, flags); + tasklet_schedule(&port->push); + spin_unlock_irqrestore(&port->port_lock, flags); +} + +static const struct tty_operations dbc_tty_ops = { + .install = dbc_tty_install, + .open = dbc_tty_open, + .close = dbc_tty_close, + .write = dbc_tty_write, + .put_char = dbc_tty_put_char, + .flush_chars = dbc_tty_flush_chars, + .write_room = dbc_tty_write_room, + .chars_in_buffer = dbc_tty_chars_in_buffer, + .unthrottle = dbc_tty_unthrottle, +}; + +static void dbc_rx_push(struct tasklet_struct *t) +{ + struct dbc_request *req; + struct tty_struct *tty; + unsigned long flags; + bool do_push = false; + bool disconnect = false; + struct dbc_port *port = from_tasklet(port, t, push); + struct list_head *queue = &port->read_queue; + + spin_lock_irqsave(&port->port_lock, flags); + tty = port->port.tty; + while (!list_empty(queue)) { + req = list_first_entry(queue, struct dbc_request, list_pool); + + if (tty && tty_throttled(tty)) + break; + + switch (req->status) { + case 0: + break; + case -ESHUTDOWN: + disconnect = true; + break; + default: + pr_warn("ttyDBC0: unexpected RX status %d\n", + req->status); + break; + } + + if (req->actual) { + char *packet = req->buf; + unsigned int n, size = req->actual; + int count; + + n = port->n_read; + if (n) { + packet += n; + size -= n; + } + + count = tty_insert_flip_string(&port->port, packet, + size); + if (count) + do_push = true; + if (count != size) { + port->n_read += count; + break; + } + port->n_read = 0; + } + + list_move(&req->list_pool, &port->read_pool); + } + + if (do_push) + tty_flip_buffer_push(&port->port); + + if (!list_empty(queue) && tty) { + if (!tty_throttled(tty)) { + if (do_push) + tasklet_schedule(&port->push); + else + pr_warn("ttyDBC0: RX not scheduled?\n"); + } + } + + if (!disconnect) + dbc_start_rx(port); + + spin_unlock_irqrestore(&port->port_lock, flags); +} + +static int dbc_port_activate(struct tty_port *_port, struct tty_struct *tty) +{ + unsigned long flags; + struct dbc_port *port = container_of(_port, struct dbc_port, port); + + spin_lock_irqsave(&port->port_lock, flags); + dbc_start_rx(port); + spin_unlock_irqrestore(&port->port_lock, flags); + + return 0; +} + +static const struct tty_port_operations dbc_port_ops = { + .activate = dbc_port_activate, +}; + +static void +xhci_dbc_tty_init_port(struct xhci_dbc *dbc, struct dbc_port *port) +{ + tty_port_init(&port->port); + spin_lock_init(&port->port_lock); + tasklet_setup(&port->push, dbc_rx_push); + INIT_LIST_HEAD(&port->read_pool); + INIT_LIST_HEAD(&port->read_queue); + INIT_LIST_HEAD(&port->write_pool); + + port->port.ops = &dbc_port_ops; + port->n_read = 0; +} + +static void +xhci_dbc_tty_exit_port(struct dbc_port *port) +{ + tasklet_kill(&port->push); + tty_port_destroy(&port->port); +} + +static int xhci_dbc_tty_register_device(struct xhci_dbc *dbc) +{ + int ret; + struct device *tty_dev; + struct dbc_port *port = dbc_to_port(dbc); + + if (port->registered) + return -EBUSY; + + xhci_dbc_tty_init_port(dbc, port); + + mutex_lock(&dbc_tty_minors_lock); + port->minor = idr_alloc(&dbc_tty_minors, port, 0, 64, GFP_KERNEL); + mutex_unlock(&dbc_tty_minors_lock); + + if (port->minor < 0) { + ret = port->minor; + goto err_idr; + } + + ret = kfifo_alloc(&port->write_fifo, DBC_WRITE_BUF_SIZE, GFP_KERNEL); + if (ret) + goto err_exit_port; + + ret = xhci_dbc_alloc_requests(dbc, BULK_IN, &port->read_pool, + dbc_read_complete); + if (ret) + goto err_free_fifo; + + ret = xhci_dbc_alloc_requests(dbc, BULK_OUT, &port->write_pool, + dbc_write_complete); + if (ret) + goto err_free_requests; + + tty_dev = tty_port_register_device(&port->port, + dbc_tty_driver, port->minor, NULL); + if (IS_ERR(tty_dev)) { + ret = PTR_ERR(tty_dev); + goto err_free_requests; + } + + port->registered = true; + + return 0; + +err_free_requests: + xhci_dbc_free_requests(&port->read_pool); + xhci_dbc_free_requests(&port->write_pool); +err_free_fifo: + kfifo_free(&port->write_fifo); +err_exit_port: + idr_remove(&dbc_tty_minors, port->minor); +err_idr: + xhci_dbc_tty_exit_port(port); + + dev_err(dbc->dev, "can't register tty port, err %d\n", ret); + + return ret; +} + +static void xhci_dbc_tty_unregister_device(struct xhci_dbc *dbc) +{ + struct dbc_port *port = dbc_to_port(dbc); + + if (!port->registered) + return; + tty_unregister_device(dbc_tty_driver, port->minor); + xhci_dbc_tty_exit_port(port); + port->registered = false; + + mutex_lock(&dbc_tty_minors_lock); + idr_remove(&dbc_tty_minors, port->minor); + mutex_unlock(&dbc_tty_minors_lock); + + kfifo_free(&port->write_fifo); + xhci_dbc_free_requests(&port->read_pool); + xhci_dbc_free_requests(&port->read_queue); + xhci_dbc_free_requests(&port->write_pool); +} + +static const struct dbc_driver dbc_driver = { + .configure = xhci_dbc_tty_register_device, + .disconnect = xhci_dbc_tty_unregister_device, +}; + +int xhci_dbc_tty_probe(struct device *dev, void __iomem *base, struct xhci_hcd *xhci) +{ + struct xhci_dbc *dbc; + struct dbc_port *port; + int status; + + if (!dbc_tty_driver) + return -ENODEV; + + port = kzalloc(sizeof(*port), GFP_KERNEL); + if (!port) + return -ENOMEM; + + dbc = xhci_alloc_dbc(dev, base, &dbc_driver); + + if (!dbc) { + status = -ENOMEM; + goto out2; + } + + dbc->priv = port; + + /* get rid of xhci once this is a real driver binding to a device */ + xhci->dbc = dbc; + + return 0; +out2: + kfree(port); + + return status; +} + +/* + * undo what probe did, assume dbc is stopped already. + * we also assume tty_unregister_device() is called before this + */ +void xhci_dbc_tty_remove(struct xhci_dbc *dbc) +{ + struct dbc_port *port = dbc_to_port(dbc); + + xhci_dbc_remove(dbc); + kfree(port); +} + +int dbc_tty_init(void) +{ + int ret; + + idr_init(&dbc_tty_minors); + + dbc_tty_driver = tty_alloc_driver(64, TTY_DRIVER_REAL_RAW | + TTY_DRIVER_DYNAMIC_DEV); + if (IS_ERR(dbc_tty_driver)) { + idr_destroy(&dbc_tty_minors); + return PTR_ERR(dbc_tty_driver); + } + + dbc_tty_driver->driver_name = "dbc_serial"; + dbc_tty_driver->name = "ttyDBC"; + + dbc_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; + dbc_tty_driver->subtype = SERIAL_TYPE_NORMAL; + dbc_tty_driver->init_termios = tty_std_termios; + dbc_tty_driver->init_termios.c_cflag = + B9600 | CS8 | CREAD | HUPCL | CLOCAL; + dbc_tty_driver->init_termios.c_ispeed = 9600; + dbc_tty_driver->init_termios.c_ospeed = 9600; + + tty_set_operations(dbc_tty_driver, &dbc_tty_ops); + + ret = tty_register_driver(dbc_tty_driver); + if (ret) { + pr_err("Can't register dbc tty driver\n"); + tty_driver_kref_put(dbc_tty_driver); + idr_destroy(&dbc_tty_minors); + } + + return ret; +} + +void dbc_tty_exit(void) +{ + if (dbc_tty_driver) { + tty_unregister_driver(dbc_tty_driver); + tty_driver_kref_put(dbc_tty_driver); + dbc_tty_driver = NULL; + } + + idr_destroy(&dbc_tty_minors); +} -- cgit v1.2.3