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/serial/generic.c | 658 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 658 insertions(+) create mode 100644 drivers/usb/serial/generic.c (limited to 'drivers/usb/serial/generic.c') diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c new file mode 100644 index 000000000..15b6dee3a --- /dev/null +++ b/drivers/usb/serial/generic.c @@ -0,0 +1,658 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * USB Serial Converter Generic functions + * + * Copyright (C) 2010 - 2013 Johan Hovold (jhovold@gmail.com) + * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com) + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef CONFIG_USB_SERIAL_GENERIC + +static __u16 vendor = 0x05f9; +static __u16 product = 0xffff; + +module_param(vendor, ushort, 0); +MODULE_PARM_DESC(vendor, "User specified USB idVendor"); + +module_param(product, ushort, 0); +MODULE_PARM_DESC(product, "User specified USB idProduct"); + +static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */ + +static int usb_serial_generic_probe(struct usb_serial *serial, + const struct usb_device_id *id) +{ + struct device *dev = &serial->interface->dev; + + dev_info(dev, "The \"generic\" usb-serial driver is only for testing and one-off prototypes.\n"); + dev_info(dev, "Tell linux-usb@vger.kernel.org to add your device to a proper driver.\n"); + + return 0; +} + +static int usb_serial_generic_calc_num_ports(struct usb_serial *serial, + struct usb_serial_endpoints *epds) +{ + struct device *dev = &serial->interface->dev; + int num_ports; + + num_ports = max(epds->num_bulk_in, epds->num_bulk_out); + + if (num_ports == 0) { + dev_err(dev, "device has no bulk endpoints\n"); + return -ENODEV; + } + + return num_ports; +} + +static struct usb_serial_driver usb_serial_generic_device = { + .driver = { + .owner = THIS_MODULE, + .name = "generic", + }, + .id_table = generic_device_ids, + .probe = usb_serial_generic_probe, + .calc_num_ports = usb_serial_generic_calc_num_ports, + .throttle = usb_serial_generic_throttle, + .unthrottle = usb_serial_generic_unthrottle, + .resume = usb_serial_generic_resume, +}; + +static struct usb_serial_driver * const serial_drivers[] = { + &usb_serial_generic_device, NULL +}; + +#endif + +int usb_serial_generic_register(void) +{ + int retval = 0; + +#ifdef CONFIG_USB_SERIAL_GENERIC + generic_device_ids[0].idVendor = vendor; + generic_device_ids[0].idProduct = product; + generic_device_ids[0].match_flags = + USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT; + + retval = usb_serial_register_drivers(serial_drivers, + "usbserial_generic", generic_device_ids); +#endif + return retval; +} + +void usb_serial_generic_deregister(void) +{ +#ifdef CONFIG_USB_SERIAL_GENERIC + usb_serial_deregister_drivers(serial_drivers); +#endif +} + +int usb_serial_generic_open(struct tty_struct *tty, struct usb_serial_port *port) +{ + int result = 0; + + clear_bit(USB_SERIAL_THROTTLED, &port->flags); + + if (port->bulk_in_size) + result = usb_serial_generic_submit_read_urbs(port, GFP_KERNEL); + + return result; +} +EXPORT_SYMBOL_GPL(usb_serial_generic_open); + +void usb_serial_generic_close(struct usb_serial_port *port) +{ + unsigned long flags; + int i; + + if (port->bulk_out_size) { + for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) + usb_kill_urb(port->write_urbs[i]); + + spin_lock_irqsave(&port->lock, flags); + kfifo_reset_out(&port->write_fifo); + spin_unlock_irqrestore(&port->lock, flags); + } + if (port->bulk_in_size) { + for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) + usb_kill_urb(port->read_urbs[i]); + } +} +EXPORT_SYMBOL_GPL(usb_serial_generic_close); + +int usb_serial_generic_prepare_write_buffer(struct usb_serial_port *port, + void *dest, size_t size) +{ + return kfifo_out_locked(&port->write_fifo, dest, size, &port->lock); +} + +/** + * usb_serial_generic_write_start - start writing buffered data + * @port: usb-serial port + * @mem_flags: flags to use for memory allocations + * + * Serialised using USB_SERIAL_WRITE_BUSY flag. + * + * Return: Zero on success or if busy, otherwise a negative errno value. + */ +int usb_serial_generic_write_start(struct usb_serial_port *port, + gfp_t mem_flags) +{ + struct urb *urb; + int count, result; + unsigned long flags; + int i; + + if (test_and_set_bit_lock(USB_SERIAL_WRITE_BUSY, &port->flags)) + return 0; +retry: + spin_lock_irqsave(&port->lock, flags); + if (!port->write_urbs_free || !kfifo_len(&port->write_fifo)) { + clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); + spin_unlock_irqrestore(&port->lock, flags); + return 0; + } + i = (int)find_first_bit(&port->write_urbs_free, + ARRAY_SIZE(port->write_urbs)); + spin_unlock_irqrestore(&port->lock, flags); + + urb = port->write_urbs[i]; + count = port->serial->type->prepare_write_buffer(port, + urb->transfer_buffer, + port->bulk_out_size); + urb->transfer_buffer_length = count; + usb_serial_debug_data(&port->dev, __func__, count, urb->transfer_buffer); + spin_lock_irqsave(&port->lock, flags); + port->tx_bytes += count; + spin_unlock_irqrestore(&port->lock, flags); + + clear_bit(i, &port->write_urbs_free); + result = usb_submit_urb(urb, mem_flags); + if (result) { + dev_err_console(port, "%s - error submitting urb: %d\n", + __func__, result); + set_bit(i, &port->write_urbs_free); + spin_lock_irqsave(&port->lock, flags); + port->tx_bytes -= count; + spin_unlock_irqrestore(&port->lock, flags); + + clear_bit_unlock(USB_SERIAL_WRITE_BUSY, &port->flags); + return result; + } + + goto retry; /* try sending off another urb */ +} +EXPORT_SYMBOL_GPL(usb_serial_generic_write_start); + +/** + * usb_serial_generic_write - generic write function + * @tty: tty for the port + * @port: usb-serial port + * @buf: data to write + * @count: number of bytes to write + * + * Return: The number of characters buffered, which may be anything from + * zero to @count, or a negative errno value. + */ +int usb_serial_generic_write(struct tty_struct *tty, + struct usb_serial_port *port, const unsigned char *buf, int count) +{ + int result; + + if (!port->bulk_out_size) + return -ENODEV; + + if (!count) + return 0; + + count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); + result = usb_serial_generic_write_start(port, GFP_ATOMIC); + if (result) + return result; + + return count; +} +EXPORT_SYMBOL_GPL(usb_serial_generic_write); + +unsigned int usb_serial_generic_write_room(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + unsigned long flags; + unsigned int room; + + if (!port->bulk_out_size) + return 0; + + spin_lock_irqsave(&port->lock, flags); + room = kfifo_avail(&port->write_fifo); + spin_unlock_irqrestore(&port->lock, flags); + + dev_dbg(&port->dev, "%s - returns %u\n", __func__, room); + return room; +} + +unsigned int usb_serial_generic_chars_in_buffer(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + unsigned long flags; + unsigned int chars; + + if (!port->bulk_out_size) + return 0; + + spin_lock_irqsave(&port->lock, flags); + chars = kfifo_len(&port->write_fifo) + port->tx_bytes; + spin_unlock_irqrestore(&port->lock, flags); + + dev_dbg(&port->dev, "%s - returns %u\n", __func__, chars); + return chars; +} +EXPORT_SYMBOL_GPL(usb_serial_generic_chars_in_buffer); + +void usb_serial_generic_wait_until_sent(struct tty_struct *tty, long timeout) +{ + struct usb_serial_port *port = tty->driver_data; + unsigned int bps; + unsigned long period; + unsigned long expire; + + bps = tty_get_baud_rate(tty); + if (!bps) + bps = 9600; /* B0 */ + /* + * Use a poll-period of roughly the time it takes to send one + * character or at least one jiffy. + */ + period = max_t(unsigned long, (10 * HZ / bps), 1); + if (timeout) + period = min_t(unsigned long, period, timeout); + + dev_dbg(&port->dev, "%s - timeout = %u ms, period = %u ms\n", + __func__, jiffies_to_msecs(timeout), + jiffies_to_msecs(period)); + expire = jiffies + timeout; + while (!port->serial->type->tx_empty(port)) { + schedule_timeout_interruptible(period); + if (signal_pending(current)) + break; + if (timeout && time_after(jiffies, expire)) + break; + } +} +EXPORT_SYMBOL_GPL(usb_serial_generic_wait_until_sent); + +static int usb_serial_generic_submit_read_urb(struct usb_serial_port *port, + int index, gfp_t mem_flags) +{ + int res; + + if (!test_and_clear_bit(index, &port->read_urbs_free)) + return 0; + + dev_dbg(&port->dev, "%s - urb %d\n", __func__, index); + + res = usb_submit_urb(port->read_urbs[index], mem_flags); + if (res) { + if (res != -EPERM && res != -ENODEV) { + dev_err(&port->dev, + "%s - usb_submit_urb failed: %d\n", + __func__, res); + } + set_bit(index, &port->read_urbs_free); + return res; + } + + return 0; +} + +int usb_serial_generic_submit_read_urbs(struct usb_serial_port *port, + gfp_t mem_flags) +{ + int res; + int i; + + for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) { + res = usb_serial_generic_submit_read_urb(port, i, mem_flags); + if (res) + goto err; + } + + return 0; +err: + for (; i >= 0; --i) + usb_kill_urb(port->read_urbs[i]); + + return res; +} +EXPORT_SYMBOL_GPL(usb_serial_generic_submit_read_urbs); + +void usb_serial_generic_process_read_urb(struct urb *urb) +{ + struct usb_serial_port *port = urb->context; + char *ch = urb->transfer_buffer; + int i; + + if (!urb->actual_length) + return; + /* + * The per character mucking around with sysrq path it too slow for + * stuff like 3G modems, so shortcircuit it in the 99.9999999% of + * cases where the USB serial is not a console anyway. + */ + if (port->sysrq) { + for (i = 0; i < urb->actual_length; i++, ch++) { + if (!usb_serial_handle_sysrq_char(port, *ch)) + tty_insert_flip_char(&port->port, *ch, TTY_NORMAL); + } + } else { + tty_insert_flip_string(&port->port, ch, urb->actual_length); + } + tty_flip_buffer_push(&port->port); +} +EXPORT_SYMBOL_GPL(usb_serial_generic_process_read_urb); + +void usb_serial_generic_read_bulk_callback(struct urb *urb) +{ + struct usb_serial_port *port = urb->context; + unsigned char *data = urb->transfer_buffer; + bool stopped = false; + int status = urb->status; + int i; + + for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i) { + if (urb == port->read_urbs[i]) + break; + } + + dev_dbg(&port->dev, "%s - urb %d, len %d\n", __func__, i, + urb->actual_length); + switch (status) { + case 0: + usb_serial_debug_data(&port->dev, __func__, urb->actual_length, + data); + port->serial->type->process_read_urb(urb); + break; + case -ENOENT: + case -ECONNRESET: + case -ESHUTDOWN: + dev_dbg(&port->dev, "%s - urb stopped: %d\n", + __func__, status); + stopped = true; + break; + case -EPIPE: + dev_err(&port->dev, "%s - urb stopped: %d\n", + __func__, status); + stopped = true; + break; + default: + dev_dbg(&port->dev, "%s - nonzero urb status: %d\n", + __func__, status); + break; + } + + /* + * Make sure URB processing is done before marking as free to avoid + * racing with unthrottle() on another CPU. Matches the barriers + * implied by the test_and_clear_bit() in + * usb_serial_generic_submit_read_urb(). + */ + smp_mb__before_atomic(); + set_bit(i, &port->read_urbs_free); + /* + * Make sure URB is marked as free before checking the throttled flag + * to avoid racing with unthrottle() on another CPU. Matches the + * smp_mb__after_atomic() in unthrottle(). + */ + smp_mb__after_atomic(); + + if (stopped) + return; + + if (test_bit(USB_SERIAL_THROTTLED, &port->flags)) + return; + + usb_serial_generic_submit_read_urb(port, i, GFP_ATOMIC); +} +EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback); + +void usb_serial_generic_write_bulk_callback(struct urb *urb) +{ + unsigned long flags; + struct usb_serial_port *port = urb->context; + int status = urb->status; + int i; + + for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i) { + if (port->write_urbs[i] == urb) + break; + } + spin_lock_irqsave(&port->lock, flags); + port->tx_bytes -= urb->transfer_buffer_length; + set_bit(i, &port->write_urbs_free); + spin_unlock_irqrestore(&port->lock, flags); + + switch (status) { + case 0: + break; + case -ENOENT: + case -ECONNRESET: + case -ESHUTDOWN: + dev_dbg(&port->dev, "%s - urb stopped: %d\n", + __func__, status); + return; + case -EPIPE: + dev_err_console(port, "%s - urb stopped: %d\n", + __func__, status); + return; + default: + dev_err_console(port, "%s - nonzero urb status: %d\n", + __func__, status); + break; + } + + usb_serial_generic_write_start(port, GFP_ATOMIC); + usb_serial_port_softint(port); +} +EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback); + +void usb_serial_generic_throttle(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + + set_bit(USB_SERIAL_THROTTLED, &port->flags); +} +EXPORT_SYMBOL_GPL(usb_serial_generic_throttle); + +void usb_serial_generic_unthrottle(struct tty_struct *tty) +{ + struct usb_serial_port *port = tty->driver_data; + + clear_bit(USB_SERIAL_THROTTLED, &port->flags); + + /* + * Matches the smp_mb__after_atomic() in + * usb_serial_generic_read_bulk_callback(). + */ + smp_mb__after_atomic(); + + usb_serial_generic_submit_read_urbs(port, GFP_KERNEL); +} +EXPORT_SYMBOL_GPL(usb_serial_generic_unthrottle); + +static bool usb_serial_generic_msr_changed(struct tty_struct *tty, + unsigned long arg, struct async_icount *cprev) +{ + struct usb_serial_port *port = tty->driver_data; + struct async_icount cnow; + unsigned long flags; + bool ret; + + /* + * Use tty-port initialised flag to detect all hangups including the + * one generated at USB-device disconnect. + */ + if (!tty_port_initialized(&port->port)) + return true; + + spin_lock_irqsave(&port->lock, flags); + cnow = port->icount; /* atomic copy*/ + spin_unlock_irqrestore(&port->lock, flags); + + ret = ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) || + ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) || + ((arg & TIOCM_CD) && (cnow.dcd != cprev->dcd)) || + ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts)); + + *cprev = cnow; + + return ret; +} + +int usb_serial_generic_tiocmiwait(struct tty_struct *tty, unsigned long arg) +{ + struct usb_serial_port *port = tty->driver_data; + struct async_icount cnow; + unsigned long flags; + int ret; + + spin_lock_irqsave(&port->lock, flags); + cnow = port->icount; /* atomic copy */ + spin_unlock_irqrestore(&port->lock, flags); + + ret = wait_event_interruptible(port->port.delta_msr_wait, + usb_serial_generic_msr_changed(tty, arg, &cnow)); + if (!ret && !tty_port_initialized(&port->port)) + ret = -EIO; + + return ret; +} +EXPORT_SYMBOL_GPL(usb_serial_generic_tiocmiwait); + +int usb_serial_generic_get_icount(struct tty_struct *tty, + struct serial_icounter_struct *icount) +{ + struct usb_serial_port *port = tty->driver_data; + struct async_icount cnow; + unsigned long flags; + + spin_lock_irqsave(&port->lock, flags); + cnow = port->icount; /* atomic copy */ + spin_unlock_irqrestore(&port->lock, flags); + + icount->cts = cnow.cts; + icount->dsr = cnow.dsr; + icount->rng = cnow.rng; + icount->dcd = cnow.dcd; + icount->tx = cnow.tx; + icount->rx = cnow.rx; + icount->frame = cnow.frame; + icount->parity = cnow.parity; + icount->overrun = cnow.overrun; + icount->brk = cnow.brk; + icount->buf_overrun = cnow.buf_overrun; + + return 0; +} +EXPORT_SYMBOL_GPL(usb_serial_generic_get_icount); + +#if defined(CONFIG_USB_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) +int usb_serial_handle_sysrq_char(struct usb_serial_port *port, unsigned int ch) +{ + if (port->sysrq) { + if (ch && time_before(jiffies, port->sysrq)) { + handle_sysrq(ch); + port->sysrq = 0; + return 1; + } + port->sysrq = 0; + } + return 0; +} +EXPORT_SYMBOL_GPL(usb_serial_handle_sysrq_char); + +int usb_serial_handle_break(struct usb_serial_port *port) +{ + if (!port->port.console) + return 0; + + if (!port->sysrq) { + port->sysrq = jiffies + HZ*5; + return 1; + } + port->sysrq = 0; + return 0; +} +EXPORT_SYMBOL_GPL(usb_serial_handle_break); +#endif + +/** + * usb_serial_handle_dcd_change - handle a change of carrier detect state + * @port: usb-serial port + * @tty: tty for the port + * @status: new carrier detect status, nonzero if active + */ +void usb_serial_handle_dcd_change(struct usb_serial_port *port, + struct tty_struct *tty, unsigned int status) +{ + dev_dbg(&port->dev, "%s - status %d\n", __func__, status); + + if (tty) { + struct tty_ldisc *ld = tty_ldisc_ref(tty); + + if (ld) { + if (ld->ops->dcd_change) + ld->ops->dcd_change(tty, status); + tty_ldisc_deref(ld); + } + } + + if (status) + wake_up_interruptible(&port->port.open_wait); + else if (tty && !C_CLOCAL(tty)) + tty_hangup(tty); +} +EXPORT_SYMBOL_GPL(usb_serial_handle_dcd_change); + +int usb_serial_generic_resume(struct usb_serial *serial) +{ + struct usb_serial_port *port; + int i, c = 0, r; + + for (i = 0; i < serial->num_ports; i++) { + port = serial->port[i]; + if (!tty_port_initialized(&port->port)) + continue; + + if (port->bulk_in_size) { + r = usb_serial_generic_submit_read_urbs(port, + GFP_NOIO); + if (r < 0) + c++; + } + + if (port->bulk_out_size) { + r = usb_serial_generic_write_start(port, GFP_NOIO); + if (r < 0) + c++; + } + } + + return c ? -EIO : 0; +} +EXPORT_SYMBOL_GPL(usb_serial_generic_resume); -- cgit v1.2.3