| /* |
| * MCT (Magic Control Technology Corp.) USB RS232 Converter Driver |
| * |
| * Copyright (C) 2000 Wolfgang Grandegger (wolfgang@ces.ch) |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is largely derived from the Belkin USB Serial Adapter Driver |
| * (see belkin_sa.[ch]). All of the information about the device was acquired |
| * by using SniffUSB on Windows98. For technical details see mct_u232.h. |
| * |
| * William G. Greathouse and Greg Kroah-Hartman provided great help on how to |
| * do the reverse engineering and how to write a USB serial device driver. |
| * |
| * TO BE DONE, TO BE CHECKED: |
| * DTR/RTS signal handling may be incomplete or incorrect. I have mainly |
| * implemented what I have seen with SniffUSB or found in belkin_sa.c. |
| * For further TODOs check also belkin_sa.c. |
| */ |
| |
| #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 <asm/unaligned.h> |
| #include <linux/usb.h> |
| #include <linux/usb/serial.h> |
| #include <linux/serial.h> |
| #include "mct_u232.h" |
| |
| #define DRIVER_AUTHOR "Wolfgang Grandegger <wolfgang@ces.ch>" |
| #define DRIVER_DESC "Magic Control Technology USB-RS232 converter driver" |
| |
| /* |
| * Function prototypes |
| */ |
| static int mct_u232_port_probe(struct usb_serial_port *port); |
| static int mct_u232_port_remove(struct usb_serial_port *remove); |
| static int mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port); |
| static void mct_u232_close(struct usb_serial_port *port); |
| static void mct_u232_dtr_rts(struct usb_serial_port *port, int on); |
| static void mct_u232_read_int_callback(struct urb *urb); |
| static void mct_u232_set_termios(struct tty_struct *tty, |
| struct usb_serial_port *port, struct ktermios *old); |
| static void mct_u232_break_ctl(struct tty_struct *tty, int break_state); |
| static int mct_u232_tiocmget(struct tty_struct *tty); |
| static int mct_u232_tiocmset(struct tty_struct *tty, |
| unsigned int set, unsigned int clear); |
| static void mct_u232_throttle(struct tty_struct *tty); |
| static void mct_u232_unthrottle(struct tty_struct *tty); |
| |
| |
| /* |
| * All of the device info needed for the MCT USB-RS232 converter. |
| */ |
| static const struct usb_device_id id_table[] = { |
| { USB_DEVICE(MCT_U232_VID, MCT_U232_PID) }, |
| { USB_DEVICE(MCT_U232_VID, MCT_U232_SITECOM_PID) }, |
| { USB_DEVICE(MCT_U232_VID, MCT_U232_DU_H3SP_PID) }, |
| { USB_DEVICE(MCT_U232_BELKIN_F5U109_VID, MCT_U232_BELKIN_F5U109_PID) }, |
| { } /* Terminating entry */ |
| }; |
| MODULE_DEVICE_TABLE(usb, id_table); |
| |
| static struct usb_serial_driver mct_u232_device = { |
| .driver = { |
| .owner = THIS_MODULE, |
| .name = "mct_u232", |
| }, |
| .description = "MCT U232", |
| .id_table = id_table, |
| .num_ports = 1, |
| .open = mct_u232_open, |
| .close = mct_u232_close, |
| .dtr_rts = mct_u232_dtr_rts, |
| .throttle = mct_u232_throttle, |
| .unthrottle = mct_u232_unthrottle, |
| .read_int_callback = mct_u232_read_int_callback, |
| .set_termios = mct_u232_set_termios, |
| .break_ctl = mct_u232_break_ctl, |
| .tiocmget = mct_u232_tiocmget, |
| .tiocmset = mct_u232_tiocmset, |
| .tiocmiwait = usb_serial_generic_tiocmiwait, |
| .port_probe = mct_u232_port_probe, |
| .port_remove = mct_u232_port_remove, |
| .get_icount = usb_serial_generic_get_icount, |
| }; |
| |
| static struct usb_serial_driver * const serial_drivers[] = { |
| &mct_u232_device, NULL |
| }; |
| |
| struct mct_u232_private { |
| struct urb *read_urb; |
| spinlock_t lock; |
| unsigned int control_state; /* Modem Line Setting (TIOCM) */ |
| unsigned char last_lcr; /* Line Control Register */ |
| unsigned char last_lsr; /* Line Status Register */ |
| unsigned char last_msr; /* Modem Status Register */ |
| unsigned int rx_flags; /* Throttling flags */ |
| }; |
| |
| #define THROTTLED 0x01 |
| |
| /* |
| * Handle vendor specific USB requests |
| */ |
| |
| #define WDR_TIMEOUT 5000 /* default urb timeout */ |
| |
| /* |
| * Later day 2.6.0-test kernels have new baud rates like B230400 which |
| * we do not know how to support. We ignore them for the moment. |
| */ |
| static int mct_u232_calculate_baud_rate(struct usb_serial *serial, |
| speed_t value, speed_t *result) |
| { |
| *result = value; |
| |
| if (le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_SITECOM_PID |
| || le16_to_cpu(serial->dev->descriptor.idProduct) == MCT_U232_BELKIN_F5U109_PID) { |
| switch (value) { |
| case 300: |
| return 0x01; |
| case 600: |
| return 0x02; /* this one not tested */ |
| case 1200: |
| return 0x03; |
| case 2400: |
| return 0x04; |
| case 4800: |
| return 0x06; |
| case 9600: |
| return 0x08; |
| case 19200: |
| return 0x09; |
| case 38400: |
| return 0x0a; |
| case 57600: |
| return 0x0b; |
| case 115200: |
| return 0x0c; |
| default: |
| *result = 9600; |
| return 0x08; |
| } |
| } else { |
| /* FIXME: Can we use any divider - should we do |
| divider = 115200/value; |
| real baud = 115200/divider */ |
| switch (value) { |
| case 300: break; |
| case 600: break; |
| case 1200: break; |
| case 2400: break; |
| case 4800: break; |
| case 9600: break; |
| case 19200: break; |
| case 38400: break; |
| case 57600: break; |
| case 115200: break; |
| default: |
| value = 9600; |
| *result = 9600; |
| } |
| return 115200/value; |
| } |
| } |
| |
| static int mct_u232_set_baud_rate(struct tty_struct *tty, |
| struct usb_serial *serial, struct usb_serial_port *port, speed_t value) |
| { |
| unsigned int divisor; |
| int rc; |
| unsigned char *buf; |
| unsigned char cts_enable_byte = 0; |
| speed_t speed; |
| |
| buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL); |
| if (buf == NULL) |
| return -ENOMEM; |
| |
| divisor = mct_u232_calculate_baud_rate(serial, value, &speed); |
| put_unaligned_le32(cpu_to_le32(divisor), buf); |
| rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), |
| MCT_U232_SET_BAUD_RATE_REQUEST, |
| MCT_U232_SET_REQUEST_TYPE, |
| 0, 0, buf, MCT_U232_SET_BAUD_RATE_SIZE, |
| WDR_TIMEOUT); |
| if (rc < 0) /*FIXME: What value speed results */ |
| dev_err(&port->dev, "Set BAUD RATE %d failed (error = %d)\n", |
| value, rc); |
| else |
| tty_encode_baud_rate(tty, speed, speed); |
| dev_dbg(&port->dev, "set_baud_rate: value: 0x%x, divisor: 0x%x\n", value, divisor); |
| |
| /* Mimic the MCT-supplied Windows driver (version 1.21P.0104), which |
| always sends two extra USB 'device request' messages after the |
| 'baud rate change' message. The actual functionality of the |
| request codes in these messages is not fully understood but these |
| particular codes are never seen in any operation besides a baud |
| rate change. Both of these messages send a single byte of data. |
| In the first message, the value of this byte is always zero. |
| |
| The second message has been determined experimentally to control |
| whether data will be transmitted to a device which is not asserting |
| the 'CTS' signal. If the second message's data byte is zero, data |
| will be transmitted even if 'CTS' is not asserted (i.e. no hardware |
| flow control). if the second message's data byte is nonzero (a |
| value of 1 is used by this driver), data will not be transmitted to |
| a device which is not asserting 'CTS'. |
| */ |
| |
| buf[0] = 0; |
| rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), |
| MCT_U232_SET_UNKNOWN1_REQUEST, |
| MCT_U232_SET_REQUEST_TYPE, |
| 0, 0, buf, MCT_U232_SET_UNKNOWN1_SIZE, |
| WDR_TIMEOUT); |
| if (rc < 0) |
| dev_err(&port->dev, "Sending USB device request code %d " |
| "failed (error = %d)\n", MCT_U232_SET_UNKNOWN1_REQUEST, |
| rc); |
| |
| if (port && C_CRTSCTS(tty)) |
| cts_enable_byte = 1; |
| |
| dev_dbg(&port->dev, "set_baud_rate: send second control message, data = %02X\n", |
| cts_enable_byte); |
| buf[0] = cts_enable_byte; |
| rc = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), |
| MCT_U232_SET_CTS_REQUEST, |
| MCT_U232_SET_REQUEST_TYPE, |
| 0, 0, buf, MCT_U232_SET_CTS_SIZE, |
| WDR_TIMEOUT); |
| if (rc < 0) |
| dev_err(&port->dev, "Sending USB device request code %d " |
| "failed (error = %d)\n", MCT_U232_SET_CTS_REQUEST, rc); |
| |
| kfree(buf); |
| return rc; |
| } /* mct_u232_set_baud_rate */ |
| |
| static int mct_u232_set_line_ctrl(struct usb_serial_port *port, |
| unsigned char lcr) |
| { |
| int rc; |
| unsigned char *buf; |
| |
| buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL); |
| if (buf == NULL) |
| return -ENOMEM; |
| |
| buf[0] = lcr; |
| rc = usb_control_msg(port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0), |
| MCT_U232_SET_LINE_CTRL_REQUEST, |
| MCT_U232_SET_REQUEST_TYPE, |
| 0, 0, buf, MCT_U232_SET_LINE_CTRL_SIZE, |
| WDR_TIMEOUT); |
| if (rc < 0) |
| dev_err(&port->dev, "Set LINE CTRL 0x%x failed (error = %d)\n", lcr, rc); |
| dev_dbg(&port->dev, "set_line_ctrl: 0x%x\n", lcr); |
| kfree(buf); |
| return rc; |
| } /* mct_u232_set_line_ctrl */ |
| |
| static int mct_u232_set_modem_ctrl(struct usb_serial_port *port, |
| unsigned int control_state) |
| { |
| int rc; |
| unsigned char mcr; |
| unsigned char *buf; |
| |
| buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL); |
| if (buf == NULL) |
| return -ENOMEM; |
| |
| mcr = MCT_U232_MCR_NONE; |
| if (control_state & TIOCM_DTR) |
| mcr |= MCT_U232_MCR_DTR; |
| if (control_state & TIOCM_RTS) |
| mcr |= MCT_U232_MCR_RTS; |
| |
| buf[0] = mcr; |
| rc = usb_control_msg(port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0), |
| MCT_U232_SET_MODEM_CTRL_REQUEST, |
| MCT_U232_SET_REQUEST_TYPE, |
| 0, 0, buf, MCT_U232_SET_MODEM_CTRL_SIZE, |
| WDR_TIMEOUT); |
| kfree(buf); |
| |
| dev_dbg(&port->dev, "set_modem_ctrl: state=0x%x ==> mcr=0x%x\n", control_state, mcr); |
| |
| if (rc < 0) { |
| dev_err(&port->dev, "Set MODEM CTRL 0x%x failed (error = %d)\n", mcr, rc); |
| return rc; |
| } |
| return 0; |
| } /* mct_u232_set_modem_ctrl */ |
| |
| static int mct_u232_get_modem_stat(struct usb_serial_port *port, |
| unsigned char *msr) |
| { |
| int rc; |
| unsigned char *buf; |
| |
| buf = kmalloc(MCT_U232_MAX_SIZE, GFP_KERNEL); |
| if (buf == NULL) { |
| *msr = 0; |
| return -ENOMEM; |
| } |
| rc = usb_control_msg(port->serial->dev, usb_rcvctrlpipe(port->serial->dev, 0), |
| MCT_U232_GET_MODEM_STAT_REQUEST, |
| MCT_U232_GET_REQUEST_TYPE, |
| 0, 0, buf, MCT_U232_GET_MODEM_STAT_SIZE, |
| WDR_TIMEOUT); |
| if (rc < 0) { |
| dev_err(&port->dev, "Get MODEM STATus failed (error = %d)\n", rc); |
| *msr = 0; |
| } else { |
| *msr = buf[0]; |
| } |
| dev_dbg(&port->dev, "get_modem_stat: 0x%x\n", *msr); |
| kfree(buf); |
| return rc; |
| } /* mct_u232_get_modem_stat */ |
| |
| static void mct_u232_msr_to_icount(struct async_icount *icount, |
| unsigned char msr) |
| { |
| /* Translate Control Line states */ |
| if (msr & MCT_U232_MSR_DDSR) |
| icount->dsr++; |
| if (msr & MCT_U232_MSR_DCTS) |
| icount->cts++; |
| if (msr & MCT_U232_MSR_DRI) |
| icount->rng++; |
| if (msr & MCT_U232_MSR_DCD) |
| icount->dcd++; |
| } /* mct_u232_msr_to_icount */ |
| |
| static void mct_u232_msr_to_state(struct usb_serial_port *port, |
| unsigned int *control_state, unsigned char msr) |
| { |
| /* Translate Control Line states */ |
| if (msr & MCT_U232_MSR_DSR) |
| *control_state |= TIOCM_DSR; |
| else |
| *control_state &= ~TIOCM_DSR; |
| if (msr & MCT_U232_MSR_CTS) |
| *control_state |= TIOCM_CTS; |
| else |
| *control_state &= ~TIOCM_CTS; |
| if (msr & MCT_U232_MSR_RI) |
| *control_state |= TIOCM_RI; |
| else |
| *control_state &= ~TIOCM_RI; |
| if (msr & MCT_U232_MSR_CD) |
| *control_state |= TIOCM_CD; |
| else |
| *control_state &= ~TIOCM_CD; |
| dev_dbg(&port->dev, "msr_to_state: msr=0x%x ==> state=0x%x\n", msr, *control_state); |
| } /* mct_u232_msr_to_state */ |
| |
| /* |
| * Driver's tty interface functions |
| */ |
| |
| static int mct_u232_port_probe(struct usb_serial_port *port) |
| { |
| struct mct_u232_private *priv; |
| |
| priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
| if (!priv) |
| return -ENOMEM; |
| |
| /* Use second interrupt-in endpoint for reading. */ |
| priv->read_urb = port->serial->port[1]->interrupt_in_urb; |
| priv->read_urb->context = port; |
| |
| spin_lock_init(&priv->lock); |
| |
| usb_set_serial_port_data(port, priv); |
| |
| return 0; |
| } |
| |
| static int mct_u232_port_remove(struct usb_serial_port *port) |
| { |
| struct mct_u232_private *priv; |
| |
| priv = usb_get_serial_port_data(port); |
| kfree(priv); |
| |
| return 0; |
| } |
| |
| static int mct_u232_open(struct tty_struct *tty, struct usb_serial_port *port) |
| { |
| struct usb_serial *serial = port->serial; |
| struct mct_u232_private *priv = usb_get_serial_port_data(port); |
| int retval = 0; |
| unsigned int control_state; |
| unsigned long flags; |
| unsigned char last_lcr; |
| unsigned char last_msr; |
| |
| /* Compensate for a hardware bug: although the Sitecom U232-P25 |
| * device reports a maximum output packet size of 32 bytes, |
| * it seems to be able to accept only 16 bytes (and that's what |
| * SniffUSB says too...) |
| */ |
| if (le16_to_cpu(serial->dev->descriptor.idProduct) |
| == MCT_U232_SITECOM_PID) |
| port->bulk_out_size = 16; |
| |
| /* Do a defined restart: the normal serial device seems to |
| * always turn on DTR and RTS here, so do the same. I'm not |
| * sure if this is really necessary. But it should not harm |
| * either. |
| */ |
| spin_lock_irqsave(&priv->lock, flags); |
| if (tty && C_BAUD(tty)) |
| priv->control_state = TIOCM_DTR | TIOCM_RTS; |
| else |
| priv->control_state = 0; |
| |
| priv->last_lcr = (MCT_U232_DATA_BITS_8 | |
| MCT_U232_PARITY_NONE | |
| MCT_U232_STOP_BITS_1); |
| control_state = priv->control_state; |
| last_lcr = priv->last_lcr; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| mct_u232_set_modem_ctrl(port, control_state); |
| mct_u232_set_line_ctrl(port, last_lcr); |
| |
| /* Read modem status and update control state */ |
| mct_u232_get_modem_stat(port, &last_msr); |
| spin_lock_irqsave(&priv->lock, flags); |
| priv->last_msr = last_msr; |
| mct_u232_msr_to_state(port, &priv->control_state, priv->last_msr); |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| retval = usb_submit_urb(priv->read_urb, GFP_KERNEL); |
| if (retval) { |
| dev_err(&port->dev, |
| "usb_submit_urb(read) failed pipe 0x%x err %d\n", |
| port->read_urb->pipe, retval); |
| goto error; |
| } |
| |
| retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
| if (retval) { |
| usb_kill_urb(priv->read_urb); |
| dev_err(&port->dev, |
| "usb_submit_urb(read int) failed pipe 0x%x err %d", |
| port->interrupt_in_urb->pipe, retval); |
| goto error; |
| } |
| return 0; |
| |
| error: |
| return retval; |
| } /* mct_u232_open */ |
| |
| static void mct_u232_dtr_rts(struct usb_serial_port *port, int on) |
| { |
| unsigned int control_state; |
| struct mct_u232_private *priv = usb_get_serial_port_data(port); |
| |
| spin_lock_irq(&priv->lock); |
| if (on) |
| priv->control_state |= TIOCM_DTR | TIOCM_RTS; |
| else |
| priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS); |
| control_state = priv->control_state; |
| spin_unlock_irq(&priv->lock); |
| |
| mct_u232_set_modem_ctrl(port, control_state); |
| } |
| |
| static void mct_u232_close(struct usb_serial_port *port) |
| { |
| struct mct_u232_private *priv = usb_get_serial_port_data(port); |
| |
| usb_kill_urb(priv->read_urb); |
| usb_kill_urb(port->interrupt_in_urb); |
| |
| usb_serial_generic_close(port); |
| } /* mct_u232_close */ |
| |
| |
| static void mct_u232_read_int_callback(struct urb *urb) |
| { |
| struct usb_serial_port *port = urb->context; |
| struct mct_u232_private *priv = usb_get_serial_port_data(port); |
| unsigned char *data = urb->transfer_buffer; |
| int retval; |
| int status = urb->status; |
| unsigned long flags; |
| |
| switch (status) { |
| case 0: |
| /* success */ |
| break; |
| case -ECONNRESET: |
| case -ENOENT: |
| case -ESHUTDOWN: |
| /* this urb is terminated, clean up */ |
| dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n", |
| __func__, status); |
| return; |
| default: |
| dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n", |
| __func__, status); |
| goto exit; |
| } |
| |
| usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); |
| |
| /* |
| * Work-a-round: handle the 'usual' bulk-in pipe here |
| */ |
| if (urb->transfer_buffer_length > 2) { |
| if (urb->actual_length) { |
| tty_insert_flip_string(&port->port, data, |
| urb->actual_length); |
| tty_flip_buffer_push(&port->port); |
| } |
| goto exit; |
| } |
| |
| /* |
| * The interrupt-in pipe signals exceptional conditions (modem line |
| * signal changes and errors). data[0] holds MSR, data[1] holds LSR. |
| */ |
| spin_lock_irqsave(&priv->lock, flags); |
| priv->last_msr = data[MCT_U232_MSR_INDEX]; |
| |
| /* Record Control Line states */ |
| mct_u232_msr_to_state(port, &priv->control_state, priv->last_msr); |
| |
| mct_u232_msr_to_icount(&port->icount, priv->last_msr); |
| |
| #if 0 |
| /* Not yet handled. See belkin_sa.c for further information */ |
| /* Now to report any errors */ |
| priv->last_lsr = data[MCT_U232_LSR_INDEX]; |
| /* |
| * fill in the flip buffer here, but I do not know the relation |
| * to the current/next receive buffer or characters. I need |
| * to look in to this before committing any code. |
| */ |
| if (priv->last_lsr & MCT_U232_LSR_ERR) { |
| tty = tty_port_tty_get(&port->port); |
| /* Overrun Error */ |
| if (priv->last_lsr & MCT_U232_LSR_OE) { |
| } |
| /* Parity Error */ |
| if (priv->last_lsr & MCT_U232_LSR_PE) { |
| } |
| /* Framing Error */ |
| if (priv->last_lsr & MCT_U232_LSR_FE) { |
| } |
| /* Break Indicator */ |
| if (priv->last_lsr & MCT_U232_LSR_BI) { |
| } |
| tty_kref_put(tty); |
| } |
| #endif |
| wake_up_interruptible(&port->port.delta_msr_wait); |
| spin_unlock_irqrestore(&priv->lock, flags); |
| exit: |
| retval = usb_submit_urb(urb, GFP_ATOMIC); |
| if (retval) |
| dev_err(&port->dev, |
| "%s - usb_submit_urb failed with result %d\n", |
| __func__, retval); |
| } /* mct_u232_read_int_callback */ |
| |
| static void mct_u232_set_termios(struct tty_struct *tty, |
| struct usb_serial_port *port, |
| struct ktermios *old_termios) |
| { |
| struct usb_serial *serial = port->serial; |
| struct mct_u232_private *priv = usb_get_serial_port_data(port); |
| struct ktermios *termios = &tty->termios; |
| unsigned int cflag = termios->c_cflag; |
| unsigned int old_cflag = old_termios->c_cflag; |
| unsigned long flags; |
| unsigned int control_state; |
| unsigned char last_lcr; |
| |
| /* get a local copy of the current port settings */ |
| spin_lock_irqsave(&priv->lock, flags); |
| control_state = priv->control_state; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| last_lcr = 0; |
| |
| /* |
| * Update baud rate. |
| * Do not attempt to cache old rates and skip settings, |
| * disconnects screw such tricks up completely. |
| * Premature optimization is the root of all evil. |
| */ |
| |
| /* reassert DTR and RTS on transition from B0 */ |
| if ((old_cflag & CBAUD) == B0) { |
| dev_dbg(&port->dev, "%s: baud was B0\n", __func__); |
| control_state |= TIOCM_DTR | TIOCM_RTS; |
| mct_u232_set_modem_ctrl(port, control_state); |
| } |
| |
| mct_u232_set_baud_rate(tty, serial, port, tty_get_baud_rate(tty)); |
| |
| if ((cflag & CBAUD) == B0) { |
| dev_dbg(&port->dev, "%s: baud is B0\n", __func__); |
| /* Drop RTS and DTR */ |
| control_state &= ~(TIOCM_DTR | TIOCM_RTS); |
| mct_u232_set_modem_ctrl(port, control_state); |
| } |
| |
| /* |
| * Update line control register (LCR) |
| */ |
| |
| /* set the parity */ |
| if (cflag & PARENB) |
| last_lcr |= (cflag & PARODD) ? |
| MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN; |
| else |
| last_lcr |= MCT_U232_PARITY_NONE; |
| |
| /* set the number of data bits */ |
| switch (cflag & CSIZE) { |
| case CS5: |
| last_lcr |= MCT_U232_DATA_BITS_5; break; |
| case CS6: |
| last_lcr |= MCT_U232_DATA_BITS_6; break; |
| case CS7: |
| last_lcr |= MCT_U232_DATA_BITS_7; break; |
| case CS8: |
| last_lcr |= MCT_U232_DATA_BITS_8; break; |
| default: |
| dev_err(&port->dev, |
| "CSIZE was not CS5-CS8, using default of 8\n"); |
| last_lcr |= MCT_U232_DATA_BITS_8; |
| break; |
| } |
| |
| termios->c_cflag &= ~CMSPAR; |
| |
| /* set the number of stop bits */ |
| last_lcr |= (cflag & CSTOPB) ? |
| MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1; |
| |
| mct_u232_set_line_ctrl(port, last_lcr); |
| |
| /* save off the modified port settings */ |
| spin_lock_irqsave(&priv->lock, flags); |
| priv->control_state = control_state; |
| priv->last_lcr = last_lcr; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| } /* mct_u232_set_termios */ |
| |
| static void mct_u232_break_ctl(struct tty_struct *tty, int break_state) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| struct mct_u232_private *priv = usb_get_serial_port_data(port); |
| unsigned char lcr; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| lcr = priv->last_lcr; |
| |
| if (break_state) |
| lcr |= MCT_U232_SET_BREAK; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| mct_u232_set_line_ctrl(port, lcr); |
| } /* mct_u232_break_ctl */ |
| |
| |
| static int mct_u232_tiocmget(struct tty_struct *tty) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| struct mct_u232_private *priv = usb_get_serial_port_data(port); |
| unsigned int control_state; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| control_state = priv->control_state; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| |
| return control_state; |
| } |
| |
| static int mct_u232_tiocmset(struct tty_struct *tty, |
| unsigned int set, unsigned int clear) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| struct mct_u232_private *priv = usb_get_serial_port_data(port); |
| unsigned int control_state; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&priv->lock, flags); |
| control_state = priv->control_state; |
| |
| if (set & TIOCM_RTS) |
| control_state |= TIOCM_RTS; |
| if (set & TIOCM_DTR) |
| control_state |= TIOCM_DTR; |
| if (clear & TIOCM_RTS) |
| control_state &= ~TIOCM_RTS; |
| if (clear & TIOCM_DTR) |
| control_state &= ~TIOCM_DTR; |
| |
| priv->control_state = control_state; |
| spin_unlock_irqrestore(&priv->lock, flags); |
| return mct_u232_set_modem_ctrl(port, control_state); |
| } |
| |
| static void mct_u232_throttle(struct tty_struct *tty) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| struct mct_u232_private *priv = usb_get_serial_port_data(port); |
| unsigned int control_state; |
| |
| spin_lock_irq(&priv->lock); |
| priv->rx_flags |= THROTTLED; |
| if (C_CRTSCTS(tty)) { |
| priv->control_state &= ~TIOCM_RTS; |
| control_state = priv->control_state; |
| spin_unlock_irq(&priv->lock); |
| mct_u232_set_modem_ctrl(port, control_state); |
| } else { |
| spin_unlock_irq(&priv->lock); |
| } |
| } |
| |
| static void mct_u232_unthrottle(struct tty_struct *tty) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| struct mct_u232_private *priv = usb_get_serial_port_data(port); |
| unsigned int control_state; |
| |
| spin_lock_irq(&priv->lock); |
| if ((priv->rx_flags & THROTTLED) && C_CRTSCTS(tty)) { |
| priv->rx_flags &= ~THROTTLED; |
| priv->control_state |= TIOCM_RTS; |
| control_state = priv->control_state; |
| spin_unlock_irq(&priv->lock); |
| mct_u232_set_modem_ctrl(port, control_state); |
| } else { |
| spin_unlock_irq(&priv->lock); |
| } |
| } |
| |
| module_usb_serial_driver(serial_drivers, id_table); |
| |
| MODULE_AUTHOR(DRIVER_AUTHOR); |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_LICENSE("GPL"); |