Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757335AbZKROcR (ORCPT ); Wed, 18 Nov 2009 09:32:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757308AbZKROcP (ORCPT ); Wed, 18 Nov 2009 09:32:15 -0500 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:40603 "EHLO bob.linux.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757202AbZKROcK (ORCPT ); Wed, 18 Nov 2009 09:32:10 -0500 From: Alan Cox Subject: [PATCH 06/12] moxa: Use more tty_port ops To: greg@kroah.com, linux-kernel@vger.kernel.org Date: Wed, 18 Nov 2009 14:15:46 +0000 Message-ID: <20091118141542.3346.73660.stgit@localhost.localdomain> In-Reply-To: <20091118141354.3346.16910.stgit@localhost.localdomain> References: <20091118141354.3346.16910.stgit@localhost.localdomain> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6793 Lines: 235 Rework a few bits of this into tty_port format Signed-off-by: Alan Cox --- drivers/char/moxa.c | 139 ++++++++------------------------------------------- 1 files changed, 22 insertions(+), 117 deletions(-) diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c index dd0083b..96b2985 100644 --- a/drivers/char/moxa.c +++ b/drivers/char/moxa.c @@ -206,8 +206,9 @@ static int moxa_tiocmset(struct tty_struct *tty, struct file *file, static void moxa_poll(unsigned long); static void moxa_set_tty_param(struct tty_struct *, struct ktermios *); static void moxa_setup_empty_event(struct tty_struct *); -static void moxa_shut_down(struct tty_struct *); +static void moxa_shutdown(struct tty_port *); static int moxa_carrier_raised(struct tty_port *); +static void moxa_dtr_rts(struct tty_port *, int); /* * moxa board interface functions: */ @@ -409,6 +410,8 @@ static const struct tty_operations moxa_ops = { static const struct tty_port_operations moxa_port_ops = { .carrier_raised = moxa_carrier_raised, + .dtr_rts = moxa_dtr_rts, + .shutdown = moxa_shutdown, }; static struct tty_driver *moxaDriver; @@ -1112,14 +1115,12 @@ static void __exit moxa_exit(void) module_init(moxa_init); module_exit(moxa_exit); -static void moxa_close_port(struct tty_struct *tty) +static void moxa_shutdown(struct tty_port *port) { - struct moxa_port *ch = tty->driver_data; - moxa_shut_down(tty); + struct moxa_port *ch = container_of(port, struct moxa_port, port); + MoxaPortDisable(ch); MoxaPortFlushData(ch, 2); - ch->port.flags &= ~ASYNC_NORMAL_ACTIVE; - tty->driver_data = NULL; - tty_port_tty_set(&ch->port, NULL); + clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); } static int moxa_carrier_raised(struct tty_port *port) @@ -1133,39 +1134,13 @@ static int moxa_carrier_raised(struct tty_port *port) return dcd; } -static int moxa_block_till_ready(struct tty_struct *tty, struct file *filp, - struct moxa_port *ch) +static void moxa_dtr_rts(struct tty_port *port, int onoff) { - struct tty_port *port = &ch->port; - DEFINE_WAIT(wait); - int retval = 0; - u8 dcd; - - while (1) { - prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE); - if (tty_hung_up_p(filp)) { -#ifdef SERIAL_DO_RESTART - retval = -ERESTARTSYS; -#else - retval = -EAGAIN; -#endif - break; - } - dcd = tty_port_carrier_raised(port); - if (dcd) - break; - - if (signal_pending(current)) { - retval = -ERESTARTSYS; - break; - } - schedule(); - } - finish_wait(&port->open_wait, &wait); - - return retval; + struct moxa_port *ch = container_of(port, struct moxa_port, port); + MoxaPortLineCtrl(ch, onoff, onoff); } + static int moxa_open(struct tty_struct *tty, struct file *filp) { struct moxa_board_conf *brd; @@ -1194,6 +1169,7 @@ static int moxa_open(struct tty_struct *tty, struct file *filp) ch->port.count++; tty->driver_data = ch; tty_port_tty_set(&ch->port, tty); + mutex_lock(&ch->port.mutex); if (!(ch->port.flags & ASYNC_INITIALIZED)) { ch->statusflags = 0; moxa_set_tty_param(tty, tty->termios); @@ -1202,57 +1178,21 @@ static int moxa_open(struct tty_struct *tty, struct file *filp) MoxaSetFifo(ch, ch->type == PORT_16550A); ch->port.flags |= ASYNC_INITIALIZED; } + mutex_unlock(&ch->port.mutex); mutex_unlock(&moxa_openlock); - - retval = 0; - if (!(filp->f_flags & O_NONBLOCK) && !C_CLOCAL(tty)) - retval = moxa_block_till_ready(tty, filp, ch); - mutex_lock(&moxa_openlock); - if (retval) { - if (ch->port.count) /* 0 means already hung up... */ - if (--ch->port.count == 0) - moxa_close_port(tty); - } else - ch->port.flags |= ASYNC_NORMAL_ACTIVE; - mutex_unlock(&moxa_openlock); - + + retval = tty_port_block_til_ready(&ch->port, tty, filp); + if (retval == 0) + set_bit(ASYNCB_NORMAL_ACTIVE, &ch->port.flags); return retval; } static void moxa_close(struct tty_struct *tty, struct file *filp) { - struct moxa_port *ch; - int port; - - port = tty->index; - if (port == MAX_PORTS || tty_hung_up_p(filp)) - return; - - mutex_lock(&moxa_openlock); - ch = tty->driver_data; - if (ch == NULL) - goto unlock; - if (tty->count == 1 && ch->port.count != 1) { - printk(KERN_WARNING "moxa_close: bad serial port count; " - "tty->count is 1, ch->port.count is %d\n", ch->port.count); - ch->port.count = 1; - } - if (--ch->port.count < 0) { - printk(KERN_WARNING "moxa_close: bad serial port count, " - "device=%s\n", tty->name); - ch->port.count = 0; - } - if (ch->port.count) - goto unlock; - + struct moxa_port *ch = tty->driver_data; ch->cflag = tty->termios->c_cflag; - if (ch->port.flags & ASYNC_INITIALIZED) { - moxa_setup_empty_event(tty); - tty_wait_until_sent(tty, 30 * HZ); /* 30 seconds timeout */ - } - - moxa_close_port(tty); -unlock: + mutex_lock(&moxa_openlock); + tty_port_close(&ch->port, tty, filp); mutex_unlock(&moxa_openlock); } @@ -1300,14 +1240,6 @@ static int moxa_chars_in_buffer(struct tty_struct *tty) struct moxa_port *ch = tty->driver_data; int chars; - /* - * Sigh...I have to check if driver_data is NULL here, because - * if an open() fails, the TTY subsystem eventually calls - * tty_wait_until_sent(), which calls the driver's chars_in_buffer() - * routine. And since the open() failed, we return 0 here. TDJ - */ - if (ch == NULL) - return 0; lock_kernel(); chars = MoxaPortTxQueue(ch); if (chars) { @@ -1436,15 +1368,8 @@ static void moxa_hangup(struct tty_struct *tty) mutex_lock(&moxa_openlock); ch = tty->driver_data; - if (ch == NULL) { - mutex_unlock(&moxa_openlock); - return; - } - ch->port.count = 0; - moxa_close_port(tty); + tty_port_hangup(&ch->port); mutex_unlock(&moxa_openlock); - - wake_up_interruptible(&ch->port.open_wait); } static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd) @@ -1597,26 +1522,6 @@ static void moxa_setup_empty_event(struct tty_struct *tty) spin_unlock_bh(&moxa_lock); } -static void moxa_shut_down(struct tty_struct *tty) -{ - struct moxa_port *ch = tty->driver_data; - - if (!(ch->port.flags & ASYNC_INITIALIZED)) - return; - - MoxaPortDisable(ch); - - /* - * If we're a modem control device and HUPCL is on, drop RTS & DTR. - */ - if (C_HUPCL(tty)) - MoxaPortLineCtrl(ch, 0, 0); - - spin_lock_bh(&moxa_lock); - ch->port.flags &= ~ASYNC_INITIALIZED; - spin_unlock_bh(&moxa_lock); -} - /***************************************************************************** * Driver level functions: * *****************************************************************************/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/