diff options
| -rw-r--r-- | drivers/serial/serial_core.c | 288 |
1 files changed, 146 insertions, 142 deletions
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c index 2d63b13e2f7..0ffefb3f1d8 100644 --- a/drivers/serial/serial_core.c +++ b/drivers/serial/serial_core.c @@ -141,7 +141,8 @@ uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear) */ static int uart_startup(struct uart_state *state, int init_hw) { - struct uart_port *port = state->uart_port; + struct uart_port *uport = state->uart_port; + struct tty_port *port = &state->port; unsigned long page; int retval = 0; @@ -153,9 +154,9 @@ static int uart_startup(struct uart_state *state, int init_hw) * once we have successfully opened the port. Also set * up the tty->alt_speed kludge */ - set_bit(TTY_IO_ERROR, &state->port.tty->flags); + set_bit(TTY_IO_ERROR, &port->tty->flags); - if (port->type == PORT_UNKNOWN) + if (uport->type == PORT_UNKNOWN) return 0; /* @@ -172,7 +173,7 @@ static int uart_startup(struct uart_state *state, int init_hw) uart_circ_clear(&state->xmit); } - retval = port->ops->startup(port); + retval = uport->ops->startup(uport); if (retval == 0) { if (init_hw) { /* @@ -184,20 +185,20 @@ static int uart_startup(struct uart_state *state, int init_hw) * Setup the RTS and DTR signals once the * port is open and ready to respond. */ - if (state->port.tty->termios->c_cflag & CBAUD) - uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR); + if (port->tty->termios->c_cflag & CBAUD) + uart_set_mctrl(uport, TIOCM_RTS | TIOCM_DTR); } if (state->flags & UIF_CTS_FLOW) { - spin_lock_irq(&port->lock); - if (!(port->ops->get_mctrl(port) & TIOCM_CTS)) - state->port.tty->hw_stopped = 1; - spin_unlock_irq(&port->lock); + spin_lock_irq(&uport->lock); + if (!(uport->ops->get_mctrl(uport) & TIOCM_CTS)) + port->tty->hw_stopped = 1; + spin_unlock_irq(&uport->lock); } state->flags |= UIF_INITIALIZED; - clear_bit(TTY_IO_ERROR, &state->port.tty->flags); + clear_bit(TTY_IO_ERROR, &port->tty->flags); } if (retval && capable(CAP_SYS_ADMIN)) @@ -672,7 +673,8 @@ static int uart_set_info(struct uart_state *state, struct serial_struct __user *newinfo) { struct serial_struct new_serial; - struct uart_port *port = state->uart_port; + struct uart_port *uport = state->uart_port; + struct tty_port *port = &state->port; unsigned long new_port; unsigned int change_irq, change_port, closing_wait; unsigned int old_custom_divisor, close_delay; @@ -700,47 +702,47 @@ static int uart_set_info(struct uart_state *state, */ mutex_lock(&state->mutex); - change_irq = !(port->flags & UPF_FIXED_PORT) - && new_serial.irq != port->irq; + change_irq = !(uport->flags & UPF_FIXED_PORT) + && new_serial.irq != uport->irq; /* * Since changing the 'type' of the port changes its resource * allocations, we should treat type changes the same as * IO port changes. */ - change_port = !(port->flags & UPF_FIXED_PORT) - && (new_port != port->iobase || - (unsigned long)new_serial.iomem_base != port->mapbase || - new_serial.hub6 != port->hub6 || - new_serial.io_type != port->iotype || - new_serial.iomem_reg_shift != port->regshift || - new_serial.type != port->type); - - old_flags = port->flags; + change_port = !(uport->flags & UPF_FIXED_PORT) + && (new_port != uport->iobase || + (unsigned long)new_serial.iomem_base != uport->mapbase || + new_serial.hub6 != uport->hub6 || + new_serial.io_type != uport->iotype || + new_serial.iomem_reg_shift != uport->regshift || + new_serial.type != uport->type); + + old_flags = uport->flags; new_flags = new_serial.flags; - old_custom_divisor = port->custom_divisor; + old_custom_divisor = uport->custom_divisor; if (!capable(CAP_SYS_ADMIN)) { retval = -EPERM; if (change_irq || change_port || - (new_serial.baud_base != port->uartclk / 16) || - (close_delay != state->port.close_delay) || - (closing_wait != state->port.closing_wait) || + (new_serial.baud_base != uport->uartclk / 16) || + (close_delay != port->close_delay) || + (closing_wait != port->closing_wait) || (new_serial.xmit_fifo_size && - new_serial.xmit_fifo_size != port->fifosize) || + new_serial.xmit_fifo_size != uport->fifosize) || (((new_flags ^ old_flags) & ~UPF_USR_MASK) != 0)) goto exit; - port->flags = ((port->flags & ~UPF_USR_MASK) | + uport->flags = ((uport->flags & ~UPF_USR_MASK) | (new_flags & UPF_USR_MASK)); - port->custom_divisor = new_serial.custom_divisor; + uport->custom_divisor = new_serial.custom_divisor; goto check_and_exit; } /* * Ask the low level driver to verify the settings. */ - if (port->ops->verify_port) - retval = port->ops->verify_port(port, &new_serial); + if (uport->ops->verify_port) + retval = uport->ops->verify_port(uport, &new_serial); if ((new_serial.irq >= nr_irqs) || (new_serial.irq < 0) || (new_serial.baud_base < 9600)) @@ -769,31 +771,31 @@ static int uart_set_info(struct uart_state *state, unsigned long old_iobase, old_mapbase; unsigned int old_type, old_iotype, old_hub6, old_shift; - old_iobase = port->iobase; - old_mapbase = port->mapbase; - old_type = port->type; - old_hub6 = port->hub6; - old_iotype = port->iotype; - old_shift = port->regshift; + old_iobase = uport->iobase; + old_mapbase = uport->mapbase; + old_type = uport->type; + old_hub6 = uport->hub6; + old_iotype = uport->iotype; + old_shift = uport->regshift; /* * Free and release old regions */ if (old_type != PORT_UNKNOWN) - port->ops->release_port(port); + uport->ops->release_port(uport); - port->iobase = new_port; - port->type = new_serial.type; - port->hub6 = new_serial.hub6; - port->iotype = new_serial.io_type; - port->regshift = new_serial.iomem_reg_shift; - port->mapbase = (unsigned long)new_serial.iomem_base; + uport->iobase = new_port; + uport->type = new_serial.type; + uport->hub6 = new_serial.hub6; + uport->iotype = new_serial.io_type; + uport->regshift = new_serial.iomem_reg_shift; + uport->mapbase = (unsigned long)new_serial.iomem_base; /* * Claim and map the new regions */ - if (port->type != PORT_UNKNOWN) { - retval = port->ops->request_port(port); + if (uport->type != PORT_UNKNOWN) { + retval = uport->ops->request_port(uport); } else { /* Always success - Jean II */ retval = 0; @@ -804,19 +806,19 @@ static int uart_set_info(struct uart_state *state, * new port, try to restore the old settings. */ if (retval && old_type != PORT_UNKNOWN) { - port->iobase = old_iobase; - port->type = old_type; - port->hub6 = old_hub6; - port->iotype = old_iotype; - port->regshift = old_shift; - port->mapbase = old_mapbase; - retval = port->ops->request_port(port); + uport->iobase = old_iobase; + uport->type = old_type; + uport->hub6 = old_hub6; + uport->iotype = old_iotype; + uport->regshift = old_shift; + uport->mapbase = old_mapbase; + retval = uport->ops->request_port(uport); /* * If we failed to restore the old settings, * we fail like this. */ if (retval) - port->type = PORT_UNKNOWN; + uport->type = PORT_UNKNOWN; /* * We failed anyway. @@ -828,38 +830,38 @@ static int uart_set_info(struct uart_state *state, } if (change_irq) - port->irq = new_serial.irq; - if (!(port->flags & UPF_FIXED_PORT)) - port->uartclk = new_serial.baud_base * 16; - port->flags = (port->flags & ~UPF_CHANGE_MASK) | + uport->irq = new_serial.irq; + if (!(uport->flags & UPF_FIXED_PORT)) + uport->uartclk = new_serial.baud_base * 16; + uport->flags = (uport->flags & ~UPF_CHANGE_MASK) | (new_flags & UPF_CHANGE_MASK); - port->custom_divisor = new_serial.custom_divisor; - state->port.close_delay = close_delay; - state->port.closing_wait = closing_wait; + uport->custom_divisor = new_serial.custom_divisor; + port->close_delay = close_delay; + port->closing_wait = closing_wait; if (new_serial.xmit_fifo_size) - port->fifosize = new_serial.xmit_fifo_size; - if (state->port.tty) - state->port.tty->low_latency = - (port->flags & UPF_LOW_LATENCY) ? 1 : 0; + uport->fifosize = new_serial.xmit_fifo_size; + if (port->tty) + port->tty->low_latency = + (uport->flags & UPF_LOW_LATENCY) ? 1 : 0; check_and_exit: retval = 0; - if (port->type == PORT_UNKNOWN) + if (uport->type == PORT_UNKNOWN) goto exit; if (state->flags & UIF_INITIALIZED) { - if (((old_flags ^ port->flags) & UPF_SPD_MASK) || - old_custom_divisor != port->custom_divisor) { + if (((old_flags ^ uport->flags) & UPF_SPD_MASK) || + old_custom_divisor != uport->custom_divisor) { /* * If they're setting up a custom divisor or speed, * instead of clearing it, then bitch about it. No * need to rate-limit; it's CAP_SYS_ADMIN only. */ - if (port->flags & UPF_SPD_MASK) { + if (uport->flags & UPF_SPD_MASK) { char buf[64]; printk(KERN_NOTICE "%s sets custom speed on %s. This " "is deprecated.\n", current->comm, - tty_name(state->port.tty, buf)); + tty_name(port->tty, buf)); } uart_change_speed(state, NULL); } @@ -878,10 +880,11 @@ static int uart_set_info(struct uart_state *state, static int uart_get_lsr_info(struct uart_state *state, unsigned int __user *value) { - struct uart_port *port = state->uart_port; + struct uart_port *uport = state->uart_port; + struct tty_port *port = &state->port; unsigned int result; - result = port->ops->tx_empty(port); + result = uport->ops->tx_empty(uport); /* * If we're about to load something into the transmit @@ -889,9 +892,9 @@ static int uart_get_lsr_info(struct uart_state *state, * avoid a race condition (depending on when the transmit * interrupt happens). */ - if (port->x_char || + if (uport->x_char || ((uart_circ_chars_pending(&state->xmit) > 0) && - !state->port.tty->stopped && !state->port.tty->hw_stopped)) + !port->tty->stopped && !port->tty->hw_stopped)) result &= ~TIOCSER_TEMT; return put_user(result, value); @@ -900,17 +903,17 @@ static int uart_get_lsr_info(struct uart_state *state, static int uart_tiocmget(struct tty_struct *tty, struct file *file) { struct uart_state *state = tty->driver_data; - struct uart_port *port = state->uart_port; + struct uart_port *uport = state->uart_port; int result = -EIO; mutex_lock(&state->mutex); if ((!file || !tty_hung_up_p(file)) && !(tty->flags & (1 << TTY_IO_ERROR))) { - result = port->mctrl; + result = uport->mctrl; - spin_lock_irq(&port->lock); - result |= port->ops->get_mctrl(port); - spin_unlock_irq(&port->lock); + spin_lock_irq(&uport->lock); + result |= uport->ops->get_mctrl(uport); + spin_unlock_irq(&uport->lock); } mutex_unlock(&state->mutex); @@ -922,13 +925,13 @@ uart_tiocmset(struct tty_struct *tty, struct file *file, unsigned int set, unsigned int clear) { struct uart_state *state = tty->driver_data; - struct uart_port *port = state->uart_port; + struct uart_port *uport = state->uart_port; int ret = -EIO; mutex_lock(&state->mutex); if ((!file || !tty_hung_up_p(file)) && !(tty->flags & (1 << TTY_IO_ERROR))) { - uart_update_mctrl(port, set, clear); + uart_update_mctrl(uport, set, clear); ret = 0; } mutex_unlock(&state->mutex); @@ -938,12 +941,12 @@ uart_tiocmset(struct tty_struct *tty, struct file *file, static int uart_break_ctl(struct tty_struct *tty, int break_state) { struct uart_state *state = tty->driver_data; - struct uart_port *port = state->uart_port; + struct uart_port *uport = state->uart_port; mutex_lock(&state->mutex); - if (port->type != PORT_UNKNOWN) - port->ops->break_ctl(port, break_state); + if (uport->type != PORT_UNKNOWN) + uport->ops->break_ctl(uport, break_state); mutex_unlock(&state->mutex); return 0; @@ -951,7 +954,7 @@ static int uart_break_ctl(struct tty_struct *tty, int break_state) static int uart_do_autoconfig(struct uart_state *state) { - struct uart_port *port = state->uart_port; + struct uart_port *uport = state->uart_port; int flags, ret; if (!capable(CAP_SYS_ADMIN)) @@ -973,18 +976,18 @@ static int uart_do_autoconfig(struct uart_state *state) * If we already have a port type configured, * we must release its resources. */ - if (port->type != PORT_UNKNOWN) - port->ops->release_port(port); + if (uport->type != PORT_UNKNOWN) + uport->ops->release_port(uport); flags = UART_CONFIG_TYPE; - if (port->flags & UPF_AUTO_IRQ) + if (uport->flags & UPF_AUTO_IRQ) flags |= UART_CONFIG_IRQ; /* * This will claim the ports resources if * a port is found. */ - port->ops->config_port(port, flags); + uport->ops->config_port(uport, flags); ret = uart_startup(state, 1); } @@ -1001,7 +1004,7 @@ static int uart_do_autoconfig(struct uart_state *state) static int uart_wait_modem_status(struct uart_state *state, unsigned long arg) { - struct uart_port *port = state->uart_port; + struct uart_port *uport = state->uart_port; DECLARE_WAITQUEUE(wait, current); struct uart_icount cprev, cnow; int ret; @@ -1009,20 +1012,20 @@ uart_wait_modem_status(struct uart_state *state, unsigned long arg) /* * note the counters on entry */ - spin_lock_irq(&port->lock); - memcpy(&cprev, &port->icount, sizeof(struct uart_icount)); + spin_lock_irq(&uport->lock); + memcpy(&cprev, &uport->icount, sizeof(struct uart_icount)); /* * Force modem status interrupts on */ - port->ops->enable_ms(port); - spin_unlock_irq(&port->lock); + uport->ops->enable_ms(uport); + spin_unlock_irq(&uport->lock); add_wait_queue(&state->delta_msr_wait, &wait); for (;;) { - spin_lock_irq(&port->lock); - memcpy(&cnow, &port->icount, sizeof(struct uart_icount)); - spin_unlock_irq(&port->lock); + spin_lock_irq(&uport->lock); + memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); + spin_unlock_irq(&uport->lock); set_current_state(TASK_INTERRUPTIBLE); @@ -1062,11 +1065,11 @@ static int uart_get_count(struct uart_state *state, { struct serial_icounter_struct icount; struct uart_icount cnow; - struct uart_port *port = state->uart_port; + struct uart_port *uport = state->uart_port; - spin_lock_irq(&port->lock); - memcpy(&cnow, &port->icount, sizeof(struct uart_icount)); - spin_unlock_irq(&port->lock); + spin_lock_irq(&uport->lock); + memcpy(&cnow, &uport->icount, sizeof(struct uart_icount)); + spin_unlock_irq(&uport->lock); icount.cts = cnow.cts; icount.dsr = cnow.dsr; @@ -1158,9 +1161,9 @@ uart_ioctl(struct tty_struct *tty, struct file *filp, unsigned int cmd, break; default: { - struct uart_port *port = state->uart_port; - if (port->ops->ioctl) - ret = port->ops->ioctl(port, cmd, arg); + struct uart_port *uport = state->uart_port; + if (uport->ops->ioctl) + ret = uport->ops->ioctl(uport, cmd, arg); break; } } @@ -1173,10 +1176,10 @@ out: static void uart_set_ldisc(struct tty_struct *tty) { struct uart_state *state = tty->driver_data; - struct uart_port *port = state->uart_port; + struct uart_port *uport = state->uart_port; - if (port->ops->set_ldisc) - port->ops->set_ldisc(port); + if (uport->ops->set_ldisc) + uport->ops->set_ldisc(uport); } static void uart_set_termios(struct tty_struct *tty, @@ -1254,16 +1257,15 @@ static void uart_set_termios(struct tty_struct *tty, static void uart_close(struct tty_struct *tty, struct file *filp) { struct uart_state *state = tty->driver_data; - struct uart_port *port; + struct tty_port *port; + struct uart_port *uport; BUG_ON(!kernel_locked()); - if (!state || !state->uart_port) - return; - - port = state->uart_port; + uport = state->uart_port; + port = &state->port; - pr_debug("uart_close(%d) called\n", port->line); + pr_debug("uart_close(%d) called\n", uport->line); mutex_lock(&state->mutex); @@ -1297,8 +1299,8 @@ static void uart_close(struct tty_struct *tty, struct file *filp) */ tty->closing = 1; - if (state->port.closing_wait != USF_CLOSING_WAIT_NONE) - tty_wait_until_sent(tty, msecs_to_jiffies(state->port.closing_wait)); + if (port->closing_wait != USF_CLOSING_WAIT_NONE) + tty_wait_until_sent(tty, msecs_to_jiffies(port->closing_wait)); /* * At this point, we stop accepting input. To do this, we @@ -1307,14 +1309,14 @@ static void uart_close(struct tty_struct *tty, struct file *filp) if (state->flags & UIF_INITIALIZED) { unsigned long flags; spin_lock_irqsave(&port->lock, flags); - port->ops->stop_rx(port); + uport->ops->stop_rx(uport); spin_unlock_irqrestore(&port->lock, flags); /* * Before we drop DTR, make sure the UART transmitter * has completely drained; this is especially * important if there is a transmit FIFO! */ - uart_wait_until_sent(tty, port->timeout); + uart_wait_until_sent(tty, uport->timeout); } uart_shutdown(state); @@ -1323,12 +1325,12 @@ static void uart_close(struct tty_struct *tty, struct file *filp) tty_ldisc_flush(tty); tty->closing = 0; - state->port.tty = NULL; + port->tty = NULL; - if (state->port.blocked_open) { - if (state->port.close_delay) - msleep_interruptible(state->port.close_delay); - } else if (!uart_console(port)) { + if (port->blocked_open) { + if (port->close_delay) + msleep_interruptible(port->close_delay); + } else if (!uart_console(uport)) { uart_change_pm(state, 3); } @@ -1336,9 +1338,9 @@ static void uart_close(struct tty_struct *tty, struct file *filp) * Wake up anyone trying to open this port. */ state->flags &= ~UIF_NORMAL_ACTIVE; - wake_up_interruptible(&state->port.open_wait); + wake_up_interruptible(&port->open_wait); - done: +done: mutex_unlock(&state->mutex); } @@ -1410,6 +1412,7 @@ static void uart_wait_until_sent(struct tty_struct *tty, int timeout) static void uart_hangup(struct tty_struct *tty) { struct uart_state *state = tty->driver_data; + struct tty_port *port = &state->port; BUG_ON(!kernel_locked()); pr_debug("uart_hangup(%d)\n", state->uart_port->line); @@ -1420,8 +1423,8 @@ static void uart_hangup(struct tty_struct *tty) uart_shutdown(state); state->count = 0; state->flags &= ~UIF_NORMAL_ACTIVE; - state->port.tty = NULL; - wake_up_interruptible(&state->port.open_wait); + port->tty = NULL; + wake_up_interruptible(&port->open_wait); wake_up_interruptible(&state->delta_msr_wait); } mutex_unlock(&state->mutex); @@ -1470,20 +1473,21 @@ static int uart_block_til_ready(struct file *filp, struct uart_state *state) { DECLARE_WAITQUEUE(wait, current); - struct uart_port *port = state->uart_port; + struct uart_port *uport = state->uart_port; + struct tty_port *port = &state->port; unsigned int mctrl; - state->port.blocked_open++; + port->blocked_open++; state->count--; - add_wait_queue(&state->port.open_wait, &wait); + add_wait_queue(&port->open_wait, &wait); while (1) { set_current_state(TASK_INTERRUPTIBLE); /* * If we have been hung up, tell userspace/restart open. */ - if (tty_hung_up_p(filp) || state->port.tty == NULL) + if (tty_hung_up_p(filp) || port->tty == NULL) break; /* @@ -1502,8 +1506,8 @@ uart_block_til_ready(struct file *filp, struct uart_state *state) * have set TTY_IO_ERROR for a non-existant port. */ if ((filp->f_flags & O_NONBLOCK) || - (state->port.tty->termios->c_cflag & CLOCAL) || - (state->port.tty->flags & (1 << TTY_IO_ERROR))) + (port->tty->termios->c_cflag & CLOCAL) || + (port->tty->flags & (1 << TTY_IO_ERROR))) break; /* @@ -1511,17 +1515,17 @@ uart_block_til_ready(struct file *filp, struct uart_state *state) * not set RTS here - we want to make sure we catch * the data from the modem. */ - if (state->port.tty->termios->c_cflag & CBAUD) - uart_set_mctrl(port, TIOCM_DTR); + if (port->tty->termios->c_cflag & CBAUD) + uart_set_mctrl(uport, TIOCM_DTR); /* * and wait for the carrier to indicate that the * modem is ready for us. */ - spin_lock_irq(&port->lock); - port->ops->enable_ms(port); - mctrl = port->ops->get_mctrl(port); - spin_unlock_irq(&port->lock); + spin_lock_irq(&uport->lock); + uport->ops->enable_ms(uport); + mctrl = uport->ops->get_mctrl(uport); + spin_unlock_irq(&uport->lock); if (mctrl & TIOCM_CAR) break; @@ -1533,15 +1537,15 @@ uart_block_til_ready(struct file *filp, struct uart_state *state) break; } set_current_state(TASK_RUNNING); - remove_wait_queue(&state->port.open_wait, &wait); + remove_wait_queue(&port->open_wait, &wait); state->count++; - state->port.blocked_open--; + port->blocked_open--; if (signal_pending(current)) return -ERESTARTSYS; - if (!state->port.tty || tty_hung_up_p(filp)) + if (!port->tty || tty_hung_up_p(filp)) return -EAGAIN; return 0; |