| // 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/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 usb_serial_port *dp_port; |
| }; |
| |
| |
| /* Local Function Declarations */ |
| |
| 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 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; |
| bool wakeup; |
| |
| /* 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 */ |
| wakeup = true; |
| 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; |
| wakeup = false; |
| } |
| } |
| 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); |
| |
| if (wakeup) |
| tty_port_tty_wakeup(&port->port); |
| } |
| |
| 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); |
| 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) { |
| bool wakeup = false; |
| |
| 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; |
| if (rts) |
| wakeup = true; |
| } 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); |
| |
| if (wakeup) |
| tty_port_tty_wakeup(&port->port); |
| } 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"); |