| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Linus Torvalds (pre-git) | 5424 | 76.62% | 11 | 12.50% |
| Greg Kroah-Hartman | 550 | 7.77% | 25 | 28.41% |
| Alan Cox | 347 | 4.90% | 10 | 11.36% |
| Johan Hovold | 337 | 4.76% | 10 | 11.36% |
| Alan Stern | 69 | 0.97% | 3 | 3.41% |
| Rusty Russell | 68 | 0.96% | 1 | 1.14% |
| Linus Torvalds | 52 | 0.73% | 7 | 7.95% |
| John Ogness | 42 | 0.59% | 1 | 1.14% |
| David Howells | 35 | 0.49% | 1 | 1.14% |
| Domen Puncer | 31 | 0.44% | 1 | 1.14% |
| Jiri Slaby | 24 | 0.34% | 4 | 4.55% |
| Oliver Neukum | 23 | 0.32% | 1 | 1.14% |
| Harvey Harrison | 19 | 0.27% | 2 | 2.27% |
| Al Borchers | 13 | 0.18% | 1 | 1.14% |
| Ingo Molnar | 11 | 0.16% | 2 | 2.27% |
| Dave Jones | 8 | 0.11% | 1 | 1.14% |
| Ganesh Varadarajan | 7 | 0.10% | 1 | 1.14% |
| Peter Hurley | 7 | 0.10% | 2 | 2.27% |
| Andrew Morton | 5 | 0.07% | 1 | 1.14% |
| Márton Németh | 3 | 0.04% | 1 | 1.14% |
| Nishanth Aravamudan | 3 | 0.04% | 1 | 1.14% |
| Julia Lawall | 1 | 0.01% | 1 | 1.14% |
| Total | 7079 | 88 |
// SPDX-License-Identifier: GPL-2.0+ /* * Digi AccelePort USB-4 and USB-2 Serial Converters * * Copyright 2000 by Digi International * * Shamelessly based on Brian Warner's keyspan_pda.c and Greg Kroah-Hartman's * usb-serial driver. * * Peter Berger (pberger@brimson.com) * Al Borchers (borchers@steinerpoint.com) */ #include <linux/kernel.h> #include <linux/errno.h> #include <linux/slab.h> #include <linux/tty.h> #include <linux/tty_driver.h> #include <linux/tty_flip.h> #include <linux/module.h> #include <linux/spinlock.h> #include <linux/workqueue.h> #include <linux/uaccess.h> #include <linux/usb.h> #include <linux/wait.h> #include <linux/sched/signal.h> #include <linux/usb/serial.h> /* Defines */ #define DRIVER_AUTHOR "Peter Berger <pberger@brimson.com>, Al Borchers <borchers@steinerpoint.com>" #define DRIVER_DESC "Digi AccelePort USB-2/USB-4 Serial Converter driver" /* port output buffer length -- must be <= transfer buffer length - 2 */ /* so we can be sure to send the full buffer in one urb */ #define DIGI_OUT_BUF_SIZE 8 /* port input buffer length -- must be >= transfer buffer length - 3 */ /* so we can be sure to hold at least one full buffer from one urb */ #define DIGI_IN_BUF_SIZE 64 /* retry timeout while sleeping */ #define DIGI_RETRY_TIMEOUT (HZ/10) /* timeout while waiting for tty output to drain in close */ /* this delay is used twice in close, so the total delay could */ /* be twice this value */ #define DIGI_CLOSE_TIMEOUT (5*HZ) /* AccelePort USB Defines */ /* ids */ #define DIGI_VENDOR_ID 0x05c5 #define DIGI_2_ID 0x0002 /* USB-2 */ #define DIGI_4_ID 0x0004 /* USB-4 */ /* commands * "INB": can be used on the in-band endpoint * "OOB": can be used on the out-of-band endpoint */ #define DIGI_CMD_SET_BAUD_RATE 0 /* INB, OOB */ #define DIGI_CMD_SET_WORD_SIZE 1 /* INB, OOB */ #define DIGI_CMD_SET_PARITY 2 /* INB, OOB */ #define DIGI_CMD_SET_STOP_BITS 3 /* INB, OOB */ #define DIGI_CMD_SET_INPUT_FLOW_CONTROL 4 /* INB, OOB */ #define DIGI_CMD_SET_OUTPUT_FLOW_CONTROL 5 /* INB, OOB */ #define DIGI_CMD_SET_DTR_SIGNAL 6 /* INB, OOB */ #define DIGI_CMD_SET_RTS_SIGNAL 7 /* INB, OOB */ #define DIGI_CMD_READ_INPUT_SIGNALS 8 /* OOB */ #define DIGI_CMD_IFLUSH_FIFO 9 /* OOB */ #define DIGI_CMD_RECEIVE_ENABLE 10 /* INB, OOB */ #define DIGI_CMD_BREAK_CONTROL 11 /* INB, OOB */ #define DIGI_CMD_LOCAL_LOOPBACK 12 /* INB, OOB */ #define DIGI_CMD_TRANSMIT_IDLE 13 /* INB, OOB */ #define DIGI_CMD_READ_UART_REGISTER 14 /* OOB */ #define DIGI_CMD_WRITE_UART_REGISTER 15 /* INB, OOB */ #define DIGI_CMD_AND_UART_REGISTER 16 /* INB, OOB */ #define DIGI_CMD_OR_UART_REGISTER 17 /* INB, OOB */ #define DIGI_CMD_SEND_DATA 18 /* INB */ #define DIGI_CMD_RECEIVE_DATA 19 /* INB */ #define DIGI_CMD_RECEIVE_DISABLE 20 /* INB */ #define DIGI_CMD_GET_PORT_TYPE 21 /* OOB */ /* baud rates */ #define DIGI_BAUD_50 0 #define DIGI_BAUD_75 1 #define DIGI_BAUD_110 2 #define DIGI_BAUD_150 3 #define DIGI_BAUD_200 4 #define DIGI_BAUD_300 5 #define DIGI_BAUD_600 6 #define DIGI_BAUD_1200 7 #define DIGI_BAUD_1800 8 #define DIGI_BAUD_2400 9 #define DIGI_BAUD_4800 10 #define DIGI_BAUD_7200 11 #define DIGI_BAUD_9600 12 #define DIGI_BAUD_14400 13 #define DIGI_BAUD_19200 14 #define DIGI_BAUD_28800 15 #define DIGI_BAUD_38400 16 #define DIGI_BAUD_57600 17 #define DIGI_BAUD_76800 18 #define DIGI_BAUD_115200 19 #define DIGI_BAUD_153600 20 #define DIGI_BAUD_230400 21 #define DIGI_BAUD_460800 22 /* arguments */ #define DIGI_WORD_SIZE_5 0 #define DIGI_WORD_SIZE_6 1 #define DIGI_WORD_SIZE_7 2 #define DIGI_WORD_SIZE_8 3 #define DIGI_PARITY_NONE 0 #define DIGI_PARITY_ODD 1 #define DIGI_PARITY_EVEN 2 #define DIGI_PARITY_MARK 3 #define DIGI_PARITY_SPACE 4 #define DIGI_STOP_BITS_1 0 #define DIGI_STOP_BITS_2 1 #define DIGI_INPUT_FLOW_CONTROL_XON_XOFF 1 #define DIGI_INPUT_FLOW_CONTROL_RTS 2 #define DIGI_INPUT_FLOW_CONTROL_DTR 4 #define DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF 1 #define DIGI_OUTPUT_FLOW_CONTROL_CTS 2 #define DIGI_OUTPUT_FLOW_CONTROL_DSR 4 #define DIGI_DTR_INACTIVE 0 #define DIGI_DTR_ACTIVE 1 #define DIGI_DTR_INPUT_FLOW_CONTROL 2 #define DIGI_RTS_INACTIVE 0 #define DIGI_RTS_ACTIVE 1 #define DIGI_RTS_INPUT_FLOW_CONTROL 2 #define DIGI_RTS_TOGGLE 3 #define DIGI_FLUSH_TX 1 #define DIGI_FLUSH_RX 2 #define DIGI_RESUME_TX 4 /* clears xoff condition */ #define DIGI_TRANSMIT_NOT_IDLE 0 #define DIGI_TRANSMIT_IDLE 1 #define DIGI_DISABLE 0 #define DIGI_ENABLE 1 #define DIGI_DEASSERT 0 #define DIGI_ASSERT 1 /* in band status codes */ #define DIGI_OVERRUN_ERROR 4 #define DIGI_PARITY_ERROR 8 #define DIGI_FRAMING_ERROR 16 #define DIGI_BREAK_ERROR 32 /* out of band status */ #define DIGI_NO_ERROR 0 #define DIGI_BAD_FIRST_PARAMETER 1 #define DIGI_BAD_SECOND_PARAMETER 2 #define DIGI_INVALID_LINE 3 #define DIGI_INVALID_OPCODE 4 /* input signals */ #define DIGI_READ_INPUT_SIGNALS_SLOT 1 #define DIGI_READ_INPUT_SIGNALS_ERR 2 #define DIGI_READ_INPUT_SIGNALS_BUSY 4 #define DIGI_READ_INPUT_SIGNALS_PE 8 #define DIGI_READ_INPUT_SIGNALS_CTS 16 #define DIGI_READ_INPUT_SIGNALS_DSR 32 #define DIGI_READ_INPUT_SIGNALS_RI 64 #define DIGI_READ_INPUT_SIGNALS_DCD 128 /* Structures */ struct digi_serial { spinlock_t ds_serial_lock; struct usb_serial_port *ds_oob_port; /* out-of-band port */ int ds_oob_port_num; /* index of out-of-band port */ int ds_device_started; }; struct digi_port { spinlock_t dp_port_lock; int dp_port_num; int dp_out_buf_len; unsigned char dp_out_buf[DIGI_OUT_BUF_SIZE]; int dp_write_urb_in_use; unsigned int dp_modem_signals; int dp_transmit_idle; wait_queue_head_t dp_transmit_idle_wait; int dp_throttled; int dp_throttle_restart; wait_queue_head_t dp_flush_wait; wait_queue_head_t dp_close_wait; /* wait queue for close */ struct work_struct dp_wakeup_work; struct usb_serial_port *dp_port; }; /* Local Function Declarations */ static void digi_wakeup_write_lock(struct work_struct *work); static int digi_write_oob_command(struct usb_serial_port *port, unsigned char *buf, int count, int interruptible); static int digi_write_inb_command(struct usb_serial_port *port, unsigned char *buf, int count, unsigned long timeout); static int digi_set_modem_signals(struct usb_serial_port *port, unsigned int modem_signals, int interruptible); static int digi_transmit_idle(struct usb_serial_port *port, unsigned long timeout); static void digi_rx_throttle(struct tty_struct *tty); static void digi_rx_unthrottle(struct tty_struct *tty); static void digi_set_termios(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios); static void digi_break_ctl(struct tty_struct *tty, int break_state); static int digi_tiocmget(struct tty_struct *tty); static int digi_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear); static int digi_write(struct tty_struct *tty, struct usb_serial_port *port, const unsigned char *buf, int count); static void digi_write_bulk_callback(struct urb *urb); static int digi_write_room(struct tty_struct *tty); static int digi_chars_in_buffer(struct tty_struct *tty); static int digi_open(struct tty_struct *tty, struct usb_serial_port *port); static void digi_close(struct usb_serial_port *port); static void digi_dtr_rts(struct usb_serial_port *port, int on); static int digi_startup_device(struct usb_serial *serial); static int digi_startup(struct usb_serial *serial); static void digi_disconnect(struct usb_serial *serial); static void digi_release(struct usb_serial *serial); static int digi_port_probe(struct usb_serial_port *port); static int digi_port_remove(struct usb_serial_port *port); static void digi_read_bulk_callback(struct urb *urb); static int digi_read_inb_callback(struct urb *urb); static int digi_read_oob_callback(struct urb *urb); static const struct usb_device_id id_table_combined[] = { { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) }, { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) }, { } /* Terminating entry */ }; static const struct usb_device_id id_table_2[] = { { USB_DEVICE(DIGI_VENDOR_ID, DIGI_2_ID) }, { } /* Terminating entry */ }; static const struct usb_device_id id_table_4[] = { { USB_DEVICE(DIGI_VENDOR_ID, DIGI_4_ID) }, { } /* Terminating entry */ }; MODULE_DEVICE_TABLE(usb, id_table_combined); /* device info needed for the Digi serial converter */ static struct usb_serial_driver digi_acceleport_2_device = { .driver = { .owner = THIS_MODULE, .name = "digi_2", }, .description = "Digi 2 port USB adapter", .id_table = id_table_2, .num_ports = 3, .num_bulk_in = 4, .num_bulk_out = 4, .open = digi_open, .close = digi_close, .dtr_rts = digi_dtr_rts, .write = digi_write, .write_room = digi_write_room, .write_bulk_callback = digi_write_bulk_callback, .read_bulk_callback = digi_read_bulk_callback, .chars_in_buffer = digi_chars_in_buffer, .throttle = digi_rx_throttle, .unthrottle = digi_rx_unthrottle, .set_termios = digi_set_termios, .break_ctl = digi_break_ctl, .tiocmget = digi_tiocmget, .tiocmset = digi_tiocmset, .attach = digi_startup, .disconnect = digi_disconnect, .release = digi_release, .port_probe = digi_port_probe, .port_remove = digi_port_remove, }; static struct usb_serial_driver digi_acceleport_4_device = { .driver = { .owner = THIS_MODULE, .name = "digi_4", }, .description = "Digi 4 port USB adapter", .id_table = id_table_4, .num_ports = 4, .num_bulk_in = 5, .num_bulk_out = 5, .open = digi_open, .close = digi_close, .write = digi_write, .write_room = digi_write_room, .write_bulk_callback = digi_write_bulk_callback, .read_bulk_callback = digi_read_bulk_callback, .chars_in_buffer = digi_chars_in_buffer, .throttle = digi_rx_throttle, .unthrottle = digi_rx_unthrottle, .set_termios = digi_set_termios, .break_ctl = digi_break_ctl, .tiocmget = digi_tiocmget, .tiocmset = digi_tiocmset, .attach = digi_startup, .disconnect = digi_disconnect, .release = digi_release, .port_probe = digi_port_probe, .port_remove = digi_port_remove, }; static struct usb_serial_driver * const serial_drivers[] = { &digi_acceleport_2_device, &digi_acceleport_4_device, NULL }; /* Functions */ /* * Cond Wait Interruptible Timeout Irqrestore * * Do spin_unlock_irqrestore and interruptible_sleep_on_timeout * so that wake ups are not lost if they occur between the unlock * and the sleep. In other words, spin_unlock_irqrestore and * interruptible_sleep_on_timeout are "atomic" with respect to * wake ups. This is used to implement condition variables. * * interruptible_sleep_on_timeout is deprecated and has been replaced * with the equivalent code. */ static long cond_wait_interruptible_timeout_irqrestore( wait_queue_head_t *q, long timeout, spinlock_t *lock, unsigned long flags) __releases(lock) { DEFINE_WAIT(wait); prepare_to_wait(q, &wait, TASK_INTERRUPTIBLE); spin_unlock_irqrestore(lock, flags); timeout = schedule_timeout(timeout); finish_wait(q, &wait); return timeout; } /* * Digi Wakeup Write * * Wake up port, line discipline, and tty processes sleeping * on writes. */ static void digi_wakeup_write_lock(struct work_struct *work) { struct digi_port *priv = container_of(work, struct digi_port, dp_wakeup_work); struct usb_serial_port *port = priv->dp_port; unsigned long flags; spin_lock_irqsave(&priv->dp_port_lock, flags); tty_port_tty_wakeup(&port->port); spin_unlock_irqrestore(&priv->dp_port_lock, flags); } /* * Digi Write OOB Command * * Write commands on the out of band port. Commands are 4 * bytes each, multiple commands can be sent at once, and * no command will be split across USB packets. Returns 0 * if successful, -EINTR if interrupted while sleeping and * the interruptible flag is true, or a negative error * returned by usb_submit_urb. */ static int digi_write_oob_command(struct usb_serial_port *port, unsigned char *buf, int count, int interruptible) { int ret = 0; int len; struct usb_serial_port *oob_port = (struct usb_serial_port *)((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); unsigned long flags = 0; dev_dbg(&port->dev, "digi_write_oob_command: TOP: port=%d, count=%d\n", oob_priv->dp_port_num, count); spin_lock_irqsave(&oob_priv->dp_port_lock, flags); while (count > 0) { while (oob_priv->dp_write_urb_in_use) { cond_wait_interruptible_timeout_irqrestore( &oob_port->write_wait, DIGI_RETRY_TIMEOUT, &oob_priv->dp_port_lock, flags); if (interruptible && signal_pending(current)) return -EINTR; spin_lock_irqsave(&oob_priv->dp_port_lock, flags); } /* len must be a multiple of 4, so commands are not split */ len = min(count, oob_port->bulk_out_size); if (len > 4) len &= ~3; memcpy(oob_port->write_urb->transfer_buffer, buf, len); oob_port->write_urb->transfer_buffer_length = len; ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC); if (ret == 0) { oob_priv->dp_write_urb_in_use = 1; count -= len; buf += len; } } spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags); if (ret) dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n", __func__, ret); return ret; } /* * Digi Write In Band Command * * Write commands on the given port. Commands are 4 * bytes each, multiple commands can be sent at once, and * no command will be split across USB packets. If timeout * is non-zero, write in band command will return after * waiting unsuccessfully for the URB status to clear for * timeout ticks. Returns 0 if successful, or a negative * error returned by digi_write. */ static int digi_write_inb_command(struct usb_serial_port *port, unsigned char *buf, int count, unsigned long timeout) { int ret = 0; int len; struct digi_port *priv = usb_get_serial_port_data(port); unsigned char *data = port->write_urb->transfer_buffer; unsigned long flags = 0; dev_dbg(&port->dev, "digi_write_inb_command: TOP: port=%d, count=%d\n", priv->dp_port_num, count); if (timeout) timeout += jiffies; else timeout = ULONG_MAX; spin_lock_irqsave(&priv->dp_port_lock, flags); while (count > 0 && ret == 0) { while (priv->dp_write_urb_in_use && time_before(jiffies, timeout)) { cond_wait_interruptible_timeout_irqrestore( &port->write_wait, DIGI_RETRY_TIMEOUT, &priv->dp_port_lock, flags); if (signal_pending(current)) return -EINTR; spin_lock_irqsave(&priv->dp_port_lock, flags); } /* len must be a multiple of 4 and small enough to */ /* guarantee the write will send buffered data first, */ /* so commands are in order with data and not split */ len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len); if (len > 4) len &= ~3; /* write any buffered data first */ if (priv->dp_out_buf_len > 0) { data[0] = DIGI_CMD_SEND_DATA; data[1] = priv->dp_out_buf_len; memcpy(data + 2, priv->dp_out_buf, priv->dp_out_buf_len); memcpy(data + 2 + priv->dp_out_buf_len, buf, len); port->write_urb->transfer_buffer_length = priv->dp_out_buf_len + 2 + len; } else { memcpy(data, buf, len); port->write_urb->transfer_buffer_length = len; } ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); if (ret == 0) { priv->dp_write_urb_in_use = 1; priv->dp_out_buf_len = 0; count -= len; buf += len; } } spin_unlock_irqrestore(&priv->dp_port_lock, flags); if (ret) dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d, port=%d\n", __func__, ret, priv->dp_port_num); return ret; } /* * Digi Set Modem Signals * * Sets or clears DTR and RTS on the port, according to the * modem_signals argument. Use TIOCM_DTR and TIOCM_RTS flags * for the modem_signals argument. Returns 0 if successful, * -EINTR if interrupted while sleeping, or a non-zero error * returned by usb_submit_urb. */ static int digi_set_modem_signals(struct usb_serial_port *port, unsigned int modem_signals, int interruptible) { int ret; struct digi_port *port_priv = usb_get_serial_port_data(port); struct usb_serial_port *oob_port = (struct usb_serial_port *) ((struct digi_serial *)(usb_get_serial_data(port->serial)))->ds_oob_port; struct digi_port *oob_priv = usb_get_serial_port_data(oob_port); unsigned char *data = oob_port->write_urb->transfer_buffer; unsigned long flags = 0; dev_dbg(&port->dev, "digi_set_modem_signals: TOP: port=%d, modem_signals=0x%x\n", port_priv->dp_port_num, modem_signals); spin_lock_irqsave(&oob_priv->dp_port_lock, flags); spin_lock(&port_priv->dp_port_lock); while (oob_priv->dp_write_urb_in_use) { spin_unlock(&port_priv->dp_port_lock); cond_wait_interruptible_timeout_irqrestore( &oob_port->write_wait, DIGI_RETRY_TIMEOUT, &oob_priv->dp_port_lock, flags); if (interruptible && signal_pending(current)) return -EINTR; spin_lock_irqsave(&oob_priv->dp_port_lock, flags); spin_lock(&port_priv->dp_port_lock); } data[0] = DIGI_CMD_SET_DTR_SIGNAL; data[1] = port_priv->dp_port_num; data[2] = (modem_signals & TIOCM_DTR) ? DIGI_DTR_ACTIVE : DIGI_DTR_INACTIVE; data[3] = 0; data[4] = DIGI_CMD_SET_RTS_SIGNAL; data[5] = port_priv->dp_port_num; data[6] = (modem_signals & TIOCM_RTS) ? DIGI_RTS_ACTIVE : DIGI_RTS_INACTIVE; data[7] = 0; oob_port->write_urb->transfer_buffer_length = 8; ret = usb_submit_urb(oob_port->write_urb, GFP_ATOMIC); if (ret == 0) { oob_priv->dp_write_urb_in_use = 1; port_priv->dp_modem_signals &= ~(TIOCM_DTR | TIOCM_RTS); port_priv->dp_modem_signals |= modem_signals & (TIOCM_DTR | TIOCM_RTS); } spin_unlock(&port_priv->dp_port_lock); spin_unlock_irqrestore(&oob_priv->dp_port_lock, flags); if (ret) dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d\n", __func__, ret); return ret; } /* * Digi Transmit Idle * * Digi transmit idle waits, up to timeout ticks, for the transmitter * to go idle. It returns 0 if successful or a negative error. * * There are race conditions here if more than one process is calling * digi_transmit_idle on the same port at the same time. However, this * is only called from close, and only one process can be in close on a * port at a time, so its ok. */ static int digi_transmit_idle(struct usb_serial_port *port, unsigned long timeout) { int ret; unsigned char buf[2]; struct digi_port *priv = usb_get_serial_port_data(port); unsigned long flags = 0; spin_lock_irqsave(&priv->dp_port_lock, flags); priv->dp_transmit_idle = 0; spin_unlock_irqrestore(&priv->dp_port_lock, flags); buf[0] = DIGI_CMD_TRANSMIT_IDLE; buf[1] = 0; timeout += jiffies; ret = digi_write_inb_command(port, buf, 2, timeout - jiffies); if (ret != 0) return ret; spin_lock_irqsave(&priv->dp_port_lock, flags); while (time_before(jiffies, timeout) && !priv->dp_transmit_idle) { cond_wait_interruptible_timeout_irqrestore( &priv->dp_transmit_idle_wait, DIGI_RETRY_TIMEOUT, &priv->dp_port_lock, flags); if (signal_pending(current)) return -EINTR; spin_lock_irqsave(&priv->dp_port_lock, flags); } priv->dp_transmit_idle = 0; spin_unlock_irqrestore(&priv->dp_port_lock, flags); return 0; } static void digi_rx_throttle(struct tty_struct *tty) { unsigned long flags; struct usb_serial_port *port = tty->driver_data; struct digi_port *priv = usb_get_serial_port_data(port); /* stop receiving characters by not resubmitting the read urb */ spin_lock_irqsave(&priv->dp_port_lock, flags); priv->dp_throttled = 1; priv->dp_throttle_restart = 0; spin_unlock_irqrestore(&priv->dp_port_lock, flags); } static void digi_rx_unthrottle(struct tty_struct *tty) { int ret = 0; unsigned long flags; struct usb_serial_port *port = tty->driver_data; struct digi_port *priv = usb_get_serial_port_data(port); spin_lock_irqsave(&priv->dp_port_lock, flags); /* restart read chain */ if (priv->dp_throttle_restart) ret = usb_submit_urb(port->read_urb, GFP_ATOMIC); /* turn throttle off */ priv->dp_throttled = 0; priv->dp_throttle_restart = 0; spin_unlock_irqrestore(&priv->dp_port_lock, flags); if (ret) dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d, port=%d\n", __func__, ret, priv->dp_port_num); } static void digi_set_termios(struct tty_struct *tty, struct usb_serial_port *port, struct ktermios *old_termios) { struct digi_port *priv = usb_get_serial_port_data(port); struct device *dev = &port->dev; unsigned int iflag = tty->termios.c_iflag; unsigned int cflag = tty->termios.c_cflag; unsigned int old_iflag = old_termios->c_iflag; unsigned int old_cflag = old_termios->c_cflag; unsigned char buf[32]; unsigned int modem_signals; int arg, ret; int i = 0; speed_t baud; dev_dbg(dev, "digi_set_termios: TOP: port=%d, iflag=0x%x, old_iflag=0x%x, cflag=0x%x, old_cflag=0x%x\n", priv->dp_port_num, iflag, old_iflag, cflag, old_cflag); /* set baud rate */ baud = tty_get_baud_rate(tty); if (baud != tty_termios_baud_rate(old_termios)) { arg = -1; /* reassert DTR and (maybe) RTS on transition from B0 */ if ((old_cflag & CBAUD) == B0) { /* don't set RTS if using hardware flow control */ /* and throttling input */ modem_signals = TIOCM_DTR; if (!C_CRTSCTS(tty) || !tty_throttled(tty)) modem_signals |= TIOCM_RTS; digi_set_modem_signals(port, modem_signals, 1); } switch (baud) { /* drop DTR and RTS on transition to B0 */ case 0: digi_set_modem_signals(port, 0, 1); break; case 50: arg = DIGI_BAUD_50; break; case 75: arg = DIGI_BAUD_75; break; case 110: arg = DIGI_BAUD_110; break; case 150: arg = DIGI_BAUD_150; break; case 200: arg = DIGI_BAUD_200; break; case 300: arg = DIGI_BAUD_300; break; case 600: arg = DIGI_BAUD_600; break; case 1200: arg = DIGI_BAUD_1200; break; case 1800: arg = DIGI_BAUD_1800; break; case 2400: arg = DIGI_BAUD_2400; break; case 4800: arg = DIGI_BAUD_4800; break; case 9600: arg = DIGI_BAUD_9600; break; case 19200: arg = DIGI_BAUD_19200; break; case 38400: arg = DIGI_BAUD_38400; break; case 57600: arg = DIGI_BAUD_57600; break; case 115200: arg = DIGI_BAUD_115200; break; case 230400: arg = DIGI_BAUD_230400; break; case 460800: arg = DIGI_BAUD_460800; break; default: arg = DIGI_BAUD_9600; baud = 9600; break; } if (arg != -1) { buf[i++] = DIGI_CMD_SET_BAUD_RATE; buf[i++] = priv->dp_port_num; buf[i++] = arg; buf[i++] = 0; } } /* set parity */ tty->termios.c_cflag &= ~CMSPAR; if ((cflag & (PARENB | PARODD)) != (old_cflag & (PARENB | PARODD))) { if (cflag & PARENB) { if (cflag & PARODD) arg = DIGI_PARITY_ODD; else arg = DIGI_PARITY_EVEN; } else { arg = DIGI_PARITY_NONE; } buf[i++] = DIGI_CMD_SET_PARITY; buf[i++] = priv->dp_port_num; buf[i++] = arg; buf[i++] = 0; } /* set word size */ if ((cflag & CSIZE) != (old_cflag & CSIZE)) { arg = -1; switch (cflag & CSIZE) { case CS5: arg = DIGI_WORD_SIZE_5; break; case CS6: arg = DIGI_WORD_SIZE_6; break; case CS7: arg = DIGI_WORD_SIZE_7; break; case CS8: arg = DIGI_WORD_SIZE_8; break; default: dev_dbg(dev, "digi_set_termios: can't handle word size %d\n", cflag & CSIZE); break; } if (arg != -1) { buf[i++] = DIGI_CMD_SET_WORD_SIZE; buf[i++] = priv->dp_port_num; buf[i++] = arg; buf[i++] = 0; } } /* set stop bits */ if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { if ((cflag & CSTOPB)) arg = DIGI_STOP_BITS_2; else arg = DIGI_STOP_BITS_1; buf[i++] = DIGI_CMD_SET_STOP_BITS; buf[i++] = priv->dp_port_num; buf[i++] = arg; buf[i++] = 0; } /* set input flow control */ if ((iflag & IXOFF) != (old_iflag & IXOFF) || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { arg = 0; if (iflag & IXOFF) arg |= DIGI_INPUT_FLOW_CONTROL_XON_XOFF; else arg &= ~DIGI_INPUT_FLOW_CONTROL_XON_XOFF; if (cflag & CRTSCTS) { arg |= DIGI_INPUT_FLOW_CONTROL_RTS; /* On USB-4 it is necessary to assert RTS prior */ /* to selecting RTS input flow control. */ buf[i++] = DIGI_CMD_SET_RTS_SIGNAL; buf[i++] = priv->dp_port_num; buf[i++] = DIGI_RTS_ACTIVE; buf[i++] = 0; } else { arg &= ~DIGI_INPUT_FLOW_CONTROL_RTS; } buf[i++] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; buf[i++] = priv->dp_port_num; buf[i++] = arg; buf[i++] = 0; } /* set output flow control */ if ((iflag & IXON) != (old_iflag & IXON) || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { arg = 0; if (iflag & IXON) arg |= DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; else arg &= ~DIGI_OUTPUT_FLOW_CONTROL_XON_XOFF; if (cflag & CRTSCTS) arg |= DIGI_OUTPUT_FLOW_CONTROL_CTS; else arg &= ~DIGI_OUTPUT_FLOW_CONTROL_CTS; buf[i++] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; buf[i++] = priv->dp_port_num; buf[i++] = arg; buf[i++] = 0; } /* set receive enable/disable */ if ((cflag & CREAD) != (old_cflag & CREAD)) { if (cflag & CREAD) arg = DIGI_ENABLE; else arg = DIGI_DISABLE; buf[i++] = DIGI_CMD_RECEIVE_ENABLE; buf[i++] = priv->dp_port_num; buf[i++] = arg; buf[i++] = 0; } ret = digi_write_oob_command(port, buf, i, 1); if (ret != 0) dev_dbg(dev, "digi_set_termios: write oob failed, ret=%d\n", ret); tty_encode_baud_rate(tty, baud, baud); } static void digi_break_ctl(struct tty_struct *tty, int break_state) { struct usb_serial_port *port = tty->driver_data; unsigned char buf[4]; buf[0] = DIGI_CMD_BREAK_CONTROL; buf[1] = 2; /* length */ buf[2] = break_state ? 1 : 0; buf[3] = 0; /* pad */ digi_write_inb_command(port, buf, 4, 0); } static int digi_tiocmget(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; struct digi_port *priv = usb_get_serial_port_data(port); unsigned int val; unsigned long flags; spin_lock_irqsave(&priv->dp_port_lock, flags); val = priv->dp_modem_signals; spin_unlock_irqrestore(&priv->dp_port_lock, flags); return val; } static int digi_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear) { struct usb_serial_port *port = tty->driver_data; struct digi_port *priv = usb_get_serial_port_data(port); unsigned int val; unsigned long flags; spin_lock_irqsave(&priv->dp_port_lock, flags); val = (priv->dp_modem_signals & ~clear) | set; spin_unlock_irqrestore(&priv->dp_port_lock, flags); return digi_set_modem_signals(port, val, 1); } static int digi_write(struct tty_struct *tty, struct usb_serial_port *port, const unsigned char *buf, int count) { int ret, data_len, new_len; struct digi_port *priv = usb_get_serial_port_data(port); unsigned char *data = port->write_urb->transfer_buffer; unsigned long flags = 0; dev_dbg(&port->dev, "digi_write: TOP: port=%d, count=%d, in_interrupt=%ld\n", priv->dp_port_num, count, in_interrupt()); /* copy user data (which can sleep) before getting spin lock */ count = min(count, port->bulk_out_size-2); count = min(64, count); /* be sure only one write proceeds at a time */ /* there are races on the port private buffer */ spin_lock_irqsave(&priv->dp_port_lock, flags); /* wait for urb status clear to submit another urb */ if (priv->dp_write_urb_in_use) { /* buffer data if count is 1 (probably put_char) if possible */ if (count == 1 && priv->dp_out_buf_len < DIGI_OUT_BUF_SIZE) { priv->dp_out_buf[priv->dp_out_buf_len++] = *buf; new_len = 1; } else { new_len = 0; } spin_unlock_irqrestore(&priv->dp_port_lock, flags); return new_len; } /* allow space for any buffered data and for new data, up to */ /* transfer buffer size - 2 (for command and length bytes) */ new_len = min(count, port->bulk_out_size-2-priv->dp_out_buf_len); data_len = new_len + priv->dp_out_buf_len; if (data_len == 0) { spin_unlock_irqrestore(&priv->dp_port_lock, flags); return 0; } port->write_urb->transfer_buffer_length = data_len+2; *data++ = DIGI_CMD_SEND_DATA; *data++ = data_len; /* copy in buffered data first */ memcpy(data, priv->dp_out_buf, priv->dp_out_buf_len); data += priv->dp_out_buf_len; /* copy in new data */ memcpy(data, buf, new_len); ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); if (ret == 0) { priv->dp_write_urb_in_use = 1; ret = new_len; priv->dp_out_buf_len = 0; } /* return length of new data written, or error */ spin_unlock_irqrestore(&priv->dp_port_lock, flags); if (ret < 0) dev_err_console(port, "%s: usb_submit_urb failed, ret=%d, port=%d\n", __func__, ret, priv->dp_port_num); dev_dbg(&port->dev, "digi_write: returning %d\n", ret); return ret; } static void digi_write_bulk_callback(struct urb *urb) { struct usb_serial_port *port = urb->context; struct usb_serial *serial; struct digi_port *priv; struct digi_serial *serial_priv; unsigned long flags; int ret = 0; int status = urb->status; /* port and serial sanity check */ if (port == NULL || (priv = usb_get_serial_port_data(port)) == NULL) { pr_err("%s: port or port->private is NULL, status=%d\n", __func__, status); return; } serial = port->serial; if (serial == NULL || (serial_priv = usb_get_serial_data(serial)) == NULL) { dev_err(&port->dev, "%s: serial or serial->private is NULL, status=%d\n", __func__, status); return; } /* handle oob callback */ if (priv->dp_port_num == serial_priv->ds_oob_port_num) { dev_dbg(&port->dev, "digi_write_bulk_callback: oob callback\n"); spin_lock_irqsave(&priv->dp_port_lock, flags); priv->dp_write_urb_in_use = 0; wake_up_interruptible(&port->write_wait); spin_unlock_irqrestore(&priv->dp_port_lock, flags); return; } /* try to send any buffered data on this port */ spin_lock_irqsave(&priv->dp_port_lock, flags); priv->dp_write_urb_in_use = 0; if (priv->dp_out_buf_len > 0) { *((unsigned char *)(port->write_urb->transfer_buffer)) = (unsigned char)DIGI_CMD_SEND_DATA; *((unsigned char *)(port->write_urb->transfer_buffer) + 1) = (unsigned char)priv->dp_out_buf_len; port->write_urb->transfer_buffer_length = priv->dp_out_buf_len + 2; memcpy(port->write_urb->transfer_buffer + 2, priv->dp_out_buf, priv->dp_out_buf_len); ret = usb_submit_urb(port->write_urb, GFP_ATOMIC); if (ret == 0) { priv->dp_write_urb_in_use = 1; priv->dp_out_buf_len = 0; } } /* wake up processes sleeping on writes immediately */ tty_port_tty_wakeup(&port->port); /* also queue up a wakeup at scheduler time, in case we */ /* lost the race in write_chan(). */ schedule_work(&priv->dp_wakeup_work); spin_unlock_irqrestore(&priv->dp_port_lock, flags); if (ret && ret != -EPERM) dev_err_console(port, "%s: usb_submit_urb failed, ret=%d, port=%d\n", __func__, ret, priv->dp_port_num); } static int digi_write_room(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; struct digi_port *priv = usb_get_serial_port_data(port); int room; unsigned long flags = 0; spin_lock_irqsave(&priv->dp_port_lock, flags); if (priv->dp_write_urb_in_use) room = 0; else room = port->bulk_out_size - 2 - priv->dp_out_buf_len; spin_unlock_irqrestore(&priv->dp_port_lock, flags); dev_dbg(&port->dev, "digi_write_room: port=%d, room=%d\n", priv->dp_port_num, room); return room; } static int digi_chars_in_buffer(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; struct digi_port *priv = usb_get_serial_port_data(port); if (priv->dp_write_urb_in_use) { dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n", priv->dp_port_num, port->bulk_out_size - 2); /* return(port->bulk_out_size - 2); */ return 256; } else { dev_dbg(&port->dev, "digi_chars_in_buffer: port=%d, chars=%d\n", priv->dp_port_num, priv->dp_out_buf_len); return priv->dp_out_buf_len; } } static void digi_dtr_rts(struct usb_serial_port *port, int on) { /* Adjust DTR and RTS */ digi_set_modem_signals(port, on * (TIOCM_DTR | TIOCM_RTS), 1); } static int digi_open(struct tty_struct *tty, struct usb_serial_port *port) { int ret; unsigned char buf[32]; struct digi_port *priv = usb_get_serial_port_data(port); struct ktermios not_termios; /* be sure the device is started up */ if (digi_startup_device(port->serial) != 0) return -ENXIO; /* read modem signals automatically whenever they change */ buf[0] = DIGI_CMD_READ_INPUT_SIGNALS; buf[1] = priv->dp_port_num; buf[2] = DIGI_ENABLE; buf[3] = 0; /* flush fifos */ buf[4] = DIGI_CMD_IFLUSH_FIFO; buf[5] = priv->dp_port_num; buf[6] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; buf[7] = 0; ret = digi_write_oob_command(port, buf, 8, 1); if (ret != 0) dev_dbg(&port->dev, "digi_open: write oob failed, ret=%d\n", ret); /* set termios settings */ if (tty) { not_termios.c_cflag = ~tty->termios.c_cflag; not_termios.c_iflag = ~tty->termios.c_iflag; digi_set_termios(tty, port, ¬_termios); } return 0; } static void digi_close(struct usb_serial_port *port) { DEFINE_WAIT(wait); int ret; unsigned char buf[32]; struct digi_port *priv = usb_get_serial_port_data(port); mutex_lock(&port->serial->disc_mutex); /* if disconnected, just clear flags */ if (port->serial->disconnected) goto exit; /* FIXME: Transmit idle belongs in the wait_unti_sent path */ digi_transmit_idle(port, DIGI_CLOSE_TIMEOUT); /* disable input flow control */ buf[0] = DIGI_CMD_SET_INPUT_FLOW_CONTROL; buf[1] = priv->dp_port_num; buf[2] = DIGI_DISABLE; buf[3] = 0; /* disable output flow control */ buf[4] = DIGI_CMD_SET_OUTPUT_FLOW_CONTROL; buf[5] = priv->dp_port_num; buf[6] = DIGI_DISABLE; buf[7] = 0; /* disable reading modem signals automatically */ buf[8] = DIGI_CMD_READ_INPUT_SIGNALS; buf[9] = priv->dp_port_num; buf[10] = DIGI_DISABLE; buf[11] = 0; /* disable receive */ buf[12] = DIGI_CMD_RECEIVE_ENABLE; buf[13] = priv->dp_port_num; buf[14] = DIGI_DISABLE; buf[15] = 0; /* flush fifos */ buf[16] = DIGI_CMD_IFLUSH_FIFO; buf[17] = priv->dp_port_num; buf[18] = DIGI_FLUSH_TX | DIGI_FLUSH_RX; buf[19] = 0; ret = digi_write_oob_command(port, buf, 20, 0); if (ret != 0) dev_dbg(&port->dev, "digi_close: write oob failed, ret=%d\n", ret); /* wait for final commands on oob port to complete */ prepare_to_wait(&priv->dp_flush_wait, &wait, TASK_INTERRUPTIBLE); schedule_timeout(DIGI_CLOSE_TIMEOUT); finish_wait(&priv->dp_flush_wait, &wait); /* shutdown any outstanding bulk writes */ usb_kill_urb(port->write_urb); exit: spin_lock_irq(&priv->dp_port_lock); priv->dp_write_urb_in_use = 0; wake_up_interruptible(&priv->dp_close_wait); spin_unlock_irq(&priv->dp_port_lock); mutex_unlock(&port->serial->disc_mutex); } /* * Digi Startup Device * * Starts reads on all ports. Must be called AFTER startup, with * urbs initialized. Returns 0 if successful, non-zero error otherwise. */ static int digi_startup_device(struct usb_serial *serial) { int i, ret = 0; struct digi_serial *serial_priv = usb_get_serial_data(serial); struct usb_serial_port *port; /* be sure this happens exactly once */ spin_lock(&serial_priv->ds_serial_lock); if (serial_priv->ds_device_started) { spin_unlock(&serial_priv->ds_serial_lock); return 0; } serial_priv->ds_device_started = 1; spin_unlock(&serial_priv->ds_serial_lock); /* start reading from each bulk in endpoint for the device */ /* set USB_DISABLE_SPD flag for write bulk urbs */ for (i = 0; i < serial->type->num_ports + 1; i++) { port = serial->port[i]; ret = usb_submit_urb(port->read_urb, GFP_KERNEL); if (ret != 0) { dev_err(&port->dev, "%s: usb_submit_urb failed, ret=%d, port=%d\n", __func__, ret, i); break; } } return ret; } static int digi_port_init(struct usb_serial_port *port, unsigned port_num) { struct digi_port *priv; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; spin_lock_init(&priv->dp_port_lock); priv->dp_port_num = port_num; init_waitqueue_head(&priv->dp_transmit_idle_wait); init_waitqueue_head(&priv->dp_flush_wait); init_waitqueue_head(&priv->dp_close_wait); INIT_WORK(&priv->dp_wakeup_work, digi_wakeup_write_lock); priv->dp_port = port; init_waitqueue_head(&port->write_wait); usb_set_serial_port_data(port, priv); return 0; } static int digi_startup(struct usb_serial *serial) { struct digi_serial *serial_priv; int ret; serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL); if (!serial_priv) return -ENOMEM; spin_lock_init(&serial_priv->ds_serial_lock); serial_priv->ds_oob_port_num = serial->type->num_ports; serial_priv->ds_oob_port = serial->port[serial_priv->ds_oob_port_num]; ret = digi_port_init(serial_priv->ds_oob_port, serial_priv->ds_oob_port_num); if (ret) { kfree(serial_priv); return ret; } usb_set_serial_data(serial, serial_priv); return 0; } static void digi_disconnect(struct usb_serial *serial) { int i; /* stop reads and writes on all ports */ for (i = 0; i < serial->type->num_ports + 1; i++) { usb_kill_urb(serial->port[i]->read_urb); usb_kill_urb(serial->port[i]->write_urb); } } static void digi_release(struct usb_serial *serial) { struct digi_serial *serial_priv; struct digi_port *priv; serial_priv = usb_get_serial_data(serial); priv = usb_get_serial_port_data(serial_priv->ds_oob_port); kfree(priv); kfree(serial_priv); } static int digi_port_probe(struct usb_serial_port *port) { return digi_port_init(port, port->port_number); } static int digi_port_remove(struct usb_serial_port *port) { struct digi_port *priv; priv = usb_get_serial_port_data(port); kfree(priv); return 0; } static void digi_read_bulk_callback(struct urb *urb) { struct usb_serial_port *port = urb->context; struct digi_port *priv; struct digi_serial *serial_priv; int ret; int status = urb->status; /* port sanity check, do not resubmit if port is not valid */ if (port == NULL) return; priv = usb_get_serial_port_data(port); if (priv == NULL) { dev_err(&port->dev, "%s: port->private is NULL, status=%d\n", __func__, status); return; } if (port->serial == NULL || (serial_priv = usb_get_serial_data(port->serial)) == NULL) { dev_err(&port->dev, "%s: serial is bad or serial->private " "is NULL, status=%d\n", __func__, status); return; } /* do not resubmit urb if it has any status error */ if (status) { dev_err(&port->dev, "%s: nonzero read bulk status: status=%d, port=%d\n", __func__, status, priv->dp_port_num); return; } /* handle oob or inb callback, do not resubmit if error */ if (priv->dp_port_num == serial_priv->ds_oob_port_num) { if (digi_read_oob_callback(urb) != 0) return; } else { if (digi_read_inb_callback(urb) != 0) return; } /* continue read */ ret = usb_submit_urb(urb, GFP_ATOMIC); if (ret != 0 && ret != -EPERM) { dev_err(&port->dev, "%s: failed resubmitting urb, ret=%d, port=%d\n", __func__, ret, priv->dp_port_num); } } /* * Digi Read INB Callback * * Digi Read INB Callback handles reads on the in band ports, sending * the data on to the tty subsystem. When called we know port and * port->private are not NULL and port->serial has been validated. * It returns 0 if successful, 1 if successful but the port is * throttled, and -1 if the sanity checks failed. */ static int digi_read_inb_callback(struct urb *urb) { struct usb_serial_port *port = urb->context; struct digi_port *priv = usb_get_serial_port_data(port); unsigned char *buf = urb->transfer_buffer; unsigned long flags; int opcode; int len; int port_status; unsigned char *data; int tty_flag, throttled; /* short/multiple packet check */ if (urb->actual_length < 2) { dev_warn(&port->dev, "short packet received\n"); return -1; } opcode = buf[0]; len = buf[1]; if (urb->actual_length != len + 2) { dev_err(&port->dev, "malformed packet received: port=%d, opcode=%d, len=%d, actual_length=%u\n", priv->dp_port_num, opcode, len, urb->actual_length); return -1; } if (opcode == DIGI_CMD_RECEIVE_DATA && len < 1) { dev_err(&port->dev, "malformed data packet received\n"); return -1; } spin_lock_irqsave(&priv->dp_port_lock, flags); /* check for throttle; if set, do not resubmit read urb */ /* indicate the read chain needs to be restarted on unthrottle */ throttled = priv->dp_throttled; if (throttled) priv->dp_throttle_restart = 1; /* receive data */ if (opcode == DIGI_CMD_RECEIVE_DATA) { port_status = buf[2]; data = &buf[3]; /* get flag from port_status */ tty_flag = 0; /* overrun is special, not associated with a char */ if (port_status & DIGI_OVERRUN_ERROR) tty_insert_flip_char(&port->port, 0, TTY_OVERRUN); /* break takes precedence over parity, */ /* which takes precedence over framing errors */ if (port_status & DIGI_BREAK_ERROR) tty_flag = TTY_BREAK; else if (port_status & DIGI_PARITY_ERROR) tty_flag = TTY_PARITY; else if (port_status & DIGI_FRAMING_ERROR) tty_flag = TTY_FRAME; /* data length is len-1 (one byte of len is port_status) */ --len; if (len > 0) { tty_insert_flip_string_fixed_flag(&port->port, data, tty_flag, len); tty_flip_buffer_push(&port->port); } } spin_unlock_irqrestore(&priv->dp_port_lock, flags); if (opcode == DIGI_CMD_RECEIVE_DISABLE) dev_dbg(&port->dev, "%s: got RECEIVE_DISABLE\n", __func__); else if (opcode != DIGI_CMD_RECEIVE_DATA) dev_dbg(&port->dev, "%s: unknown opcode: %d\n", __func__, opcode); return throttled ? 1 : 0; } /* * Digi Read OOB Callback * * Digi Read OOB Callback handles reads on the out of band port. * When called we know port and port->private are not NULL and * the port->serial is valid. It returns 0 if successful, and * -1 if the sanity checks failed. */ static int digi_read_oob_callback(struct urb *urb) { struct usb_serial_port *port = urb->context; struct usb_serial *serial = port->serial; struct tty_struct *tty; struct digi_port *priv; unsigned char *buf = urb->transfer_buffer; int opcode, line, status, val; unsigned long flags; int i; unsigned int rts; if (urb->actual_length < 4) return -1; /* handle each oob command */ for (i = 0; i < urb->actual_length - 3; i += 4) { opcode = buf[i]; line = buf[i + 1]; status = buf[i + 2]; val = buf[i + 3]; dev_dbg(&port->dev, "digi_read_oob_callback: opcode=%d, line=%d, status=%d, val=%d\n", opcode, line, status, val); if (status != 0 || line >= serial->type->num_ports) continue; port = serial->port[line]; priv = usb_get_serial_port_data(port); if (priv == NULL) return -1; tty = tty_port_tty_get(&port->port); rts = 0; if (tty) rts = C_CRTSCTS(tty); if (tty && opcode == DIGI_CMD_READ_INPUT_SIGNALS) { spin_lock_irqsave(&priv->dp_port_lock, flags); /* convert from digi flags to termiox flags */ if (val & DIGI_READ_INPUT_SIGNALS_CTS) { priv->dp_modem_signals |= TIOCM_CTS; /* port must be open to use tty struct */ if (rts) tty_port_tty_wakeup(&port->port); } else { priv->dp_modem_signals &= ~TIOCM_CTS; /* port must be open to use tty struct */ } if (val & DIGI_READ_INPUT_SIGNALS_DSR) priv->dp_modem_signals |= TIOCM_DSR; else priv->dp_modem_signals &= ~TIOCM_DSR; if (val & DIGI_READ_INPUT_SIGNALS_RI) priv->dp_modem_signals |= TIOCM_RI; else priv->dp_modem_signals &= ~TIOCM_RI; if (val & DIGI_READ_INPUT_SIGNALS_DCD) priv->dp_modem_signals |= TIOCM_CD; else priv->dp_modem_signals &= ~TIOCM_CD; spin_unlock_irqrestore(&priv->dp_port_lock, flags); } else if (opcode == DIGI_CMD_TRANSMIT_IDLE) { spin_lock_irqsave(&priv->dp_port_lock, flags); priv->dp_transmit_idle = 1; wake_up_interruptible(&priv->dp_transmit_idle_wait); spin_unlock_irqrestore(&priv->dp_port_lock, flags); } else if (opcode == DIGI_CMD_IFLUSH_FIFO) { wake_up_interruptible(&priv->dp_flush_wait); } tty_kref_put(tty); } return 0; } module_usb_serial_driver(serial_drivers, id_table_combined); MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL");
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