ircomm_tty_ioctl.c
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上传日期:2013-02-24
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- /*********************************************************************
- *
- * Filename: ircomm_tty_ioctl.c
- * Version:
- * Description:
- * Status: Experimental.
- * Author: Dag Brattli <dagb@cs.uit.no>
- * Created at: Thu Jun 10 14:39:09 1999
- * Modified at: Wed Jan 5 14:45:43 2000
- * Modified by: Dag Brattli <dagb@cs.uit.no>
- *
- * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
- *
- * 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 distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- *
- ********************************************************************/
- #include <linux/init.h>
- #include <linux/fs.h>
- #include <linux/sched.h>
- #include <linux/termios.h>
- #include <linux/tty.h>
- #include <linux/serial.h>
- #include <asm/segment.h>
- #include <asm/uaccess.h>
- #include <net/irda/irda.h>
- #include <net/irda/irmod.h>
- #include <net/irda/ircomm_core.h>
- #include <net/irda/ircomm_param.h>
- #include <net/irda/ircomm_tty_attach.h>
- #include <net/irda/ircomm_tty.h>
- #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
- /*
- * Function ircomm_tty_change_speed (driver)
- *
- * Change speed of the driver. If the remote device is a DCE, then this
- * should make it change the speed of its serial port
- */
- void ircomm_tty_change_speed(struct ircomm_tty_cb *self)
- {
- unsigned cflag, cval;
- int baud;
- IRDA_DEBUG(2, __FUNCTION__ "()n");
- if (!self->tty || !self->tty->termios || !self->ircomm)
- return;
- cflag = self->tty->termios->c_cflag;
- /* byte size and parity */
- switch (cflag & CSIZE) {
- case CS5: cval = IRCOMM_WSIZE_5; break;
- case CS6: cval = IRCOMM_WSIZE_6; break;
- case CS7: cval = IRCOMM_WSIZE_7; break;
- case CS8: cval = IRCOMM_WSIZE_8; break;
- default: cval = IRCOMM_WSIZE_5; break;
- }
- if (cflag & CSTOPB)
- cval |= IRCOMM_2_STOP_BIT;
-
- if (cflag & PARENB)
- cval |= IRCOMM_PARITY_ENABLE;
- if (!(cflag & PARODD))
- cval |= IRCOMM_PARITY_EVEN;
- /* Determine divisor based on baud rate */
- baud = tty_get_baud_rate(self->tty);
- if (!baud)
- baud = 9600; /* B0 transition handled in rs_set_termios */
- self->settings.data_rate = baud;
- ircomm_param_request(self, IRCOMM_DATA_RATE, FALSE);
-
- /* CTS flow control flag and modem status interrupts */
- if (cflag & CRTSCTS) {
- self->flags |= ASYNC_CTS_FLOW;
- self->settings.flow_control |= IRCOMM_RTS_CTS_IN;
- } else {
- self->flags &= ~ASYNC_CTS_FLOW;
- self->settings.flow_control &= ~IRCOMM_RTS_CTS_IN;
- }
- if (cflag & CLOCAL)
- self->flags &= ~ASYNC_CHECK_CD;
- else
- self->flags |= ASYNC_CHECK_CD;
- #if 0
- /*
- * Set up parity check flag
- */
- if (I_INPCK(self->tty))
- driver->read_status_mask |= LSR_FE | LSR_PE;
- if (I_BRKINT(driver->tty) || I_PARMRK(driver->tty))
- driver->read_status_mask |= LSR_BI;
-
- /*
- * Characters to ignore
- */
- driver->ignore_status_mask = 0;
- if (I_IGNPAR(driver->tty))
- driver->ignore_status_mask |= LSR_PE | LSR_FE;
- if (I_IGNBRK(self->tty)) {
- self->ignore_status_mask |= LSR_BI;
- /*
- * If we're ignore parity and break indicators, ignore
- * overruns too. (For real raw support).
- */
- if (I_IGNPAR(self->tty))
- self->ignore_status_mask |= LSR_OE;
- }
- #endif
- self->settings.data_format = cval;
- ircomm_param_request(self, IRCOMM_DATA_FORMAT, FALSE);
- ircomm_param_request(self, IRCOMM_FLOW_CONTROL, TRUE);
- }
- /*
- * Function ircomm_tty_set_termios (tty, old_termios)
- *
- * This routine allows the tty driver to be notified when device's
- * termios settings have changed. Note that a well-designed tty driver
- * should be prepared to accept the case where old == NULL, and try to
- * do something rational.
- */
- void ircomm_tty_set_termios(struct tty_struct *tty,
- struct termios *old_termios)
- {
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
- unsigned int cflag = tty->termios->c_cflag;
- IRDA_DEBUG(2, __FUNCTION__ "()n");
- if ((cflag == old_termios->c_cflag) &&
- (RELEVANT_IFLAG(tty->termios->c_iflag) ==
- RELEVANT_IFLAG(old_termios->c_iflag)))
- {
- return;
- }
- ircomm_tty_change_speed(self);
- /* Handle transition to B0 status */
- if ((old_termios->c_cflag & CBAUD) &&
- !(cflag & CBAUD)) {
- self->settings.dte &= ~(IRCOMM_DTR|IRCOMM_RTS);
- ircomm_param_request(self, IRCOMM_DTE, TRUE);
- }
-
- /* Handle transition away from B0 status */
- if (!(old_termios->c_cflag & CBAUD) &&
- (cflag & CBAUD)) {
- self->settings.dte |= IRCOMM_DTR;
- if (!(tty->termios->c_cflag & CRTSCTS) ||
- !test_bit(TTY_THROTTLED, &tty->flags)) {
- self->settings.dte |= IRCOMM_RTS;
- }
- ircomm_param_request(self, IRCOMM_DTE, TRUE);
- }
-
- /* Handle turning off CRTSCTS */
- if ((old_termios->c_cflag & CRTSCTS) &&
- !(tty->termios->c_cflag & CRTSCTS))
- {
- tty->hw_stopped = 0;
- ircomm_tty_start(tty);
- }
- }
- /*
- * Function ircomm_tty_get_modem_info (self, value)
- *
- *
- *
- */
- static int ircomm_tty_get_modem_info(struct ircomm_tty_cb *self,
- unsigned int *value)
- {
- unsigned int result;
- IRDA_DEBUG(2, __FUNCTION__ "()n");
- result = ((self->settings.dte & IRCOMM_RTS) ? TIOCM_RTS : 0)
- | ((self->settings.dte & IRCOMM_DTR) ? TIOCM_DTR : 0)
- | ((self->settings.dce & IRCOMM_CD) ? TIOCM_CAR : 0)
- | ((self->settings.dce & IRCOMM_RI) ? TIOCM_RNG : 0)
- | ((self->settings.dce & IRCOMM_DSR) ? TIOCM_DSR : 0)
- | ((self->settings.dce & IRCOMM_CTS) ? TIOCM_CTS : 0);
- return put_user(result, value);
- }
- /*
- * Function set_modem_info (driver, cmd, value)
- *
- *
- *
- */
- static int ircomm_tty_set_modem_info(struct ircomm_tty_cb *self,
- unsigned int cmd, unsigned int *value)
- {
- unsigned int arg;
- __u8 old_rts, old_dtr;
- IRDA_DEBUG(2, __FUNCTION__ "()n");
- ASSERT(self != NULL, return -1;);
- ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
- if (get_user(arg, value))
- return -EFAULT;
- old_rts = self->settings.dte & IRCOMM_RTS;
- old_dtr = self->settings.dte & IRCOMM_DTR;
- switch (cmd) {
- case TIOCMBIS:
- if (arg & TIOCM_RTS)
- self->settings.dte |= IRCOMM_RTS;
- if (arg & TIOCM_DTR)
- self->settings.dte |= IRCOMM_DTR;
- break;
-
- case TIOCMBIC:
- if (arg & TIOCM_RTS)
- self->settings.dte &= ~IRCOMM_RTS;
- if (arg & TIOCM_DTR)
- self->settings.dte &= ~IRCOMM_DTR;
- break;
-
- case TIOCMSET:
- self->settings.dte =
- ((self->settings.dte & ~(IRCOMM_RTS | IRCOMM_DTR))
- | ((arg & TIOCM_RTS) ? IRCOMM_RTS : 0)
- | ((arg & TIOCM_DTR) ? IRCOMM_DTR : 0));
- break;
-
- default:
- return -EINVAL;
- }
-
- if ((self->settings.dte & IRCOMM_RTS) != old_rts)
- self->settings.dte |= IRCOMM_DELTA_RTS;
- if ((self->settings.dte & IRCOMM_DTR) != old_dtr)
- self->settings.dte |= IRCOMM_DELTA_DTR;
- ircomm_param_request(self, IRCOMM_DTE, TRUE);
-
- return 0;
- }
- /*
- * Function get_serial_info (driver, retinfo)
- *
- *
- *
- */
- static int ircomm_tty_get_serial_info(struct ircomm_tty_cb *self,
- struct serial_struct *retinfo)
- {
- struct serial_struct info;
-
- if (!retinfo)
- return -EFAULT;
- IRDA_DEBUG(2, __FUNCTION__ "()n");
- memset(&info, 0, sizeof(info));
- info.line = self->line;
- info.flags = self->flags;
- info.baud_base = self->settings.data_rate;
- info.close_delay = self->close_delay;
- info.closing_wait = self->closing_wait;
- /* For compatibility */
- info.type = PORT_16550A;
- info.port = 0;
- info.irq = 0;
- info.xmit_fifo_size = 0;
- info.hub6 = 0;
- info.custom_divisor = 0;
- if (copy_to_user(retinfo, &info, sizeof(*retinfo)))
- return -EFAULT;
- return 0;
- }
- /*
- * Function set_serial_info (driver, new_info)
- *
- *
- *
- */
- static int ircomm_tty_set_serial_info(struct ircomm_tty_cb *self,
- struct serial_struct *new_info)
- {
- #if 0
- struct serial_struct new_serial;
- struct ircomm_tty_cb old_state, *state;
- IRDA_DEBUG(0, __FUNCTION__ "()n");
- if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
- return -EFAULT;
- state = self
- old_state = *self;
-
- if (!capable(CAP_SYS_ADMIN)) {
- if ((new_serial.baud_base != state->settings.data_rate) ||
- (new_serial.close_delay != state->close_delay) ||
- ((new_serial.flags & ~ASYNC_USR_MASK) !=
- (self->flags & ~ASYNC_USR_MASK)))
- return -EPERM;
- state->flags = ((state->flags & ~ASYNC_USR_MASK) |
- (new_serial.flags & ASYNC_USR_MASK));
- self->flags = ((self->flags & ~ASYNC_USR_MASK) |
- (new_serial.flags & ASYNC_USR_MASK));
- /* self->custom_divisor = new_serial.custom_divisor; */
- goto check_and_exit;
- }
- /*
- * OK, past this point, all the error checking has been done.
- * At this point, we start making changes.....
- */
- if (self->settings.data_rate != new_serial.baud_base) {
- self->settings.data_rate = new_serial.baud_base;
- ircomm_param_request(self, IRCOMM_DATA_RATE, TRUE);
- }
- self->close_delay = new_serial.close_delay * HZ/100;
- self->closing_wait = new_serial.closing_wait * HZ/100;
- /* self->custom_divisor = new_serial.custom_divisor; */
- self->flags = ((self->flags & ~ASYNC_FLAGS) |
- (new_serial.flags & ASYNC_FLAGS));
- self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
- check_and_exit:
- if (self->flags & ASYNC_INITIALIZED) {
- if (((old_state.flags & ASYNC_SPD_MASK) !=
- (self->flags & ASYNC_SPD_MASK)) ||
- (old_driver.custom_divisor != driver->custom_divisor)) {
- if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
- driver->tty->alt_speed = 57600;
- if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
- driver->tty->alt_speed = 115200;
- if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
- driver->tty->alt_speed = 230400;
- if ((driver->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
- driver->tty->alt_speed = 460800;
- ircomm_tty_change_speed(driver);
- }
- }
- #endif
- return 0;
- }
- /*
- * Function ircomm_tty_ioctl (tty, file, cmd, arg)
- *
- *
- *
- */
- int ircomm_tty_ioctl(struct tty_struct *tty, struct file *file,
- unsigned int cmd, unsigned long arg)
- {
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
- int ret = 0;
- IRDA_DEBUG(2, __FUNCTION__ "()n");
- if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
- (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
- (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
- if (tty->flags & (1 << TTY_IO_ERROR))
- return -EIO;
- }
- switch (cmd) {
- case TIOCMGET:
- ret = ircomm_tty_get_modem_info(self, (unsigned int *) arg);
- break;
- case TIOCMBIS:
- case TIOCMBIC:
- case TIOCMSET:
- ret = ircomm_tty_set_modem_info(self, cmd, (unsigned int *) arg);
- break;
- case TIOCGSERIAL:
- ret = ircomm_tty_get_serial_info(self, (struct serial_struct *) arg);
- break;
- case TIOCSSERIAL:
- ret = ircomm_tty_set_serial_info(self, (struct serial_struct *) arg);
- break;
- case TIOCMIWAIT:
- IRDA_DEBUG(0, "(), TIOCMIWAIT, not impl!n");
- break;
- case TIOCGICOUNT:
- IRDA_DEBUG(0, __FUNCTION__ "(), TIOCGICOUNT not impl!n");
- #if 0
- save_flags(flags); cli();
- cnow = driver->icount;
- restore_flags(flags);
- p_cuser = (struct serial_icounter_struct *) arg;
- if (put_user(cnow.cts, &p_cuser->cts) ||
- put_user(cnow.dsr, &p_cuser->dsr) ||
- put_user(cnow.rng, &p_cuser->rng) ||
- put_user(cnow.dcd, &p_cuser->dcd) ||
- put_user(cnow.rx, &p_cuser->rx) ||
- put_user(cnow.tx, &p_cuser->tx) ||
- put_user(cnow.frame, &p_cuser->frame) ||
- put_user(cnow.overrun, &p_cuser->overrun) ||
- put_user(cnow.parity, &p_cuser->parity) ||
- put_user(cnow.brk, &p_cuser->brk) ||
- put_user(cnow.buf_overrun, &p_cuser->buf_overrun))
- return -EFAULT;
- #endif
- return 0;
- default:
- ret = -ENOIOCTLCMD; /* ioctls which we must ignore */
- }
- return ret;
- }