2005-04-16 18:20:36 -04:00
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/*
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* generic_serial.c
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*
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* Copyright (C) 1998/1999 R.E.Wolff@BitWizard.nl
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*
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* written for the SX serial driver.
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* Contains the code that should be shared over all the serial drivers.
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*
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* Credit for the idea to do it this way might go to Alan Cox.
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*
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*
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* Version 0.1 -- December, 1998. Initial version.
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* Version 0.2 -- March, 1999. Some more routines. Bugfixes. Etc.
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* Version 0.5 -- August, 1999. Some more fixes. Reformat for Linus.
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*
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* BitWizard is actively maintaining this file. We sometimes find
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* that someone submitted changes to this file. We really appreciate
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* your help, but please submit changes through us. We're doing our
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* best to be responsive. -- REW
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* */
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/tty.h>
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#include <linux/serial.h>
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#include <linux/mm.h>
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#include <linux/generic_serial.h>
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#include <linux/interrupt.h>
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#include <linux/tty_flip.h>
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#include <linux/delay.h>
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#include <asm/uaccess.h>
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#define DEBUG
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static int gs_debug;
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#ifdef DEBUG
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#define gs_dprintk(f, str...) if (gs_debug & f) printk (str)
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#else
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#define gs_dprintk(f, str...) /* nothing */
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#endif
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2008-04-30 03:55:10 -04:00
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#define func_enter() gs_dprintk (GS_DEBUG_FLOW, "gs: enter %s\n", __func__)
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#define func_exit() gs_dprintk (GS_DEBUG_FLOW, "gs: exit %s\n", __func__)
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2005-04-16 18:20:36 -04:00
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#define RS_EVENT_WRITE_WAKEUP 1
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module_param(gs_debug, int, 0644);
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2008-04-30 03:54:03 -04:00
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int gs_put_char(struct tty_struct * tty, unsigned char ch)
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2005-04-16 18:20:36 -04:00
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{
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struct gs_port *port;
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func_enter ();
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2008-04-30 03:54:03 -04:00
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if (!tty) return 0;
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2005-04-16 18:20:36 -04:00
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port = tty->driver_data;
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2008-04-30 03:54:03 -04:00
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if (!port) return 0;
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2005-04-16 18:20:36 -04:00
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2008-04-30 03:54:03 -04:00
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if (! (port->flags & ASYNC_INITIALIZED)) return 0;
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2005-04-16 18:20:36 -04:00
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/* Take a lock on the serial tranmit buffer! */
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2007-07-16 02:41:47 -04:00
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mutex_lock(& port->port_write_mutex);
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2005-04-16 18:20:36 -04:00
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if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
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/* Sorry, buffer is full, drop character. Update statistics???? -- REW */
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2007-07-16 02:41:47 -04:00
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mutex_unlock(&port->port_write_mutex);
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2008-04-30 03:54:03 -04:00
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return 0;
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2005-04-16 18:20:36 -04:00
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}
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port->xmit_buf[port->xmit_head++] = ch;
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port->xmit_head &= SERIAL_XMIT_SIZE - 1;
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port->xmit_cnt++; /* Characters in buffer */
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2007-07-16 02:41:47 -04:00
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mutex_unlock(&port->port_write_mutex);
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2005-04-16 18:20:36 -04:00
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func_exit ();
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2008-04-30 03:54:03 -04:00
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return 1;
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2005-04-16 18:20:36 -04:00
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}
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/*
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> Problems to take into account are:
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> -1- Interrupts that empty part of the buffer.
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> -2- page faults on the access to userspace.
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> -3- Other processes that are also trying to do a "write".
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*/
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int gs_write(struct tty_struct * tty,
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const unsigned char *buf, int count)
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{
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struct gs_port *port;
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int c, total = 0;
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int t;
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func_enter ();
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if (!tty) return 0;
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port = tty->driver_data;
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if (!port) return 0;
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if (! (port->flags & ASYNC_INITIALIZED))
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return 0;
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/* get exclusive "write" access to this port (problem 3) */
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/* This is not a spinlock because we can have a disk access (page
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fault) in copy_from_user */
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2006-03-23 06:00:44 -05:00
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mutex_lock(& port->port_write_mutex);
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2005-04-16 18:20:36 -04:00
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while (1) {
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c = count;
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/* This is safe because we "OWN" the "head". Noone else can
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2006-03-23 06:00:44 -05:00
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change the "head": we own the port_write_mutex. */
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2005-04-16 18:20:36 -04:00
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/* Don't overrun the end of the buffer */
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t = SERIAL_XMIT_SIZE - port->xmit_head;
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if (t < c) c = t;
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/* This is safe because the xmit_cnt can only decrease. This
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would increase "t", so we might copy too little chars. */
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/* Don't copy past the "head" of the buffer */
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t = SERIAL_XMIT_SIZE - 1 - port->xmit_cnt;
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if (t < c) c = t;
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/* Can't copy more? break out! */
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if (c <= 0) break;
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memcpy (port->xmit_buf + port->xmit_head, buf, c);
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port -> xmit_cnt += c;
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port -> xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE -1);
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buf += c;
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count -= c;
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total += c;
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}
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2006-03-23 06:00:44 -05:00
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mutex_unlock(& port->port_write_mutex);
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2005-04-16 18:20:36 -04:00
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gs_dprintk (GS_DEBUG_WRITE, "write: interrupts are %s\n",
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(port->flags & GS_TX_INTEN)?"enabled": "disabled");
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if (port->xmit_cnt &&
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!tty->stopped &&
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!tty->hw_stopped &&
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!(port->flags & GS_TX_INTEN)) {
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port->flags |= GS_TX_INTEN;
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port->rd->enable_tx_interrupts (port);
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}
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func_exit ();
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return total;
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}
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int gs_write_room(struct tty_struct * tty)
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{
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struct gs_port *port = tty->driver_data;
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int ret;
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func_enter ();
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ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
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if (ret < 0)
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ret = 0;
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func_exit ();
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return ret;
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}
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int gs_chars_in_buffer(struct tty_struct *tty)
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{
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struct gs_port *port = tty->driver_data;
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func_enter ();
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func_exit ();
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return port->xmit_cnt;
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}
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static int gs_real_chars_in_buffer(struct tty_struct *tty)
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{
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struct gs_port *port;
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func_enter ();
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if (!tty) return 0;
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port = tty->driver_data;
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if (!port->rd) return 0;
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if (!port->rd->chars_in_buffer) return 0;
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func_exit ();
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return port->xmit_cnt + port->rd->chars_in_buffer (port);
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}
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static int gs_wait_tx_flushed (void * ptr, unsigned long timeout)
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{
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struct gs_port *port = ptr;
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unsigned long end_jiffies;
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int jiffies_to_transmit, charsleft = 0, rv = 0;
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int rcib;
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func_enter();
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gs_dprintk (GS_DEBUG_FLUSH, "port=%p.\n", port);
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if (port) {
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gs_dprintk (GS_DEBUG_FLUSH, "xmit_cnt=%x, xmit_buf=%p, tty=%p.\n",
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port->xmit_cnt, port->xmit_buf, port->tty);
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}
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if (!port || port->xmit_cnt < 0 || !port->xmit_buf) {
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gs_dprintk (GS_DEBUG_FLUSH, "ERROR: !port, !port->xmit_buf or prot->xmit_cnt < 0.\n");
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func_exit();
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return -EINVAL; /* This is an error which we don't know how to handle. */
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}
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rcib = gs_real_chars_in_buffer(port->tty);
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if(rcib <= 0) {
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gs_dprintk (GS_DEBUG_FLUSH, "nothing to wait for.\n");
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func_exit();
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return rv;
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}
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/* stop trying: now + twice the time it would normally take + seconds */
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if (timeout == 0) timeout = MAX_SCHEDULE_TIMEOUT;
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end_jiffies = jiffies;
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if (timeout != MAX_SCHEDULE_TIMEOUT)
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end_jiffies += port->baud?(2 * rcib * 10 * HZ / port->baud):0;
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end_jiffies += timeout;
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gs_dprintk (GS_DEBUG_FLUSH, "now=%lx, end=%lx (%ld).\n",
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jiffies, end_jiffies, end_jiffies-jiffies);
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/* the expression is actually jiffies < end_jiffies, but that won't
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work around the wraparound. Tricky eh? */
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while ((charsleft = gs_real_chars_in_buffer (port->tty)) &&
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time_after (end_jiffies, jiffies)) {
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/* Units check:
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chars * (bits/char) * (jiffies /sec) / (bits/sec) = jiffies!
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check! */
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charsleft += 16; /* Allow 16 chars more to be transmitted ... */
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jiffies_to_transmit = port->baud?(1 + charsleft * 10 * HZ / port->baud):0;
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/* ^^^ Round up.... */
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if (jiffies_to_transmit <= 0) jiffies_to_transmit = 1;
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gs_dprintk (GS_DEBUG_FLUSH, "Expect to finish in %d jiffies "
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"(%d chars).\n", jiffies_to_transmit, charsleft);
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msleep_interruptible(jiffies_to_msecs(jiffies_to_transmit));
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if (signal_pending (current)) {
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gs_dprintk (GS_DEBUG_FLUSH, "Signal pending. Bombing out: ");
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rv = -EINTR;
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break;
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}
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}
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gs_dprintk (GS_DEBUG_FLUSH, "charsleft = %d.\n", charsleft);
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set_current_state (TASK_RUNNING);
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func_exit();
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return rv;
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}
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void gs_flush_buffer(struct tty_struct *tty)
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{
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struct gs_port *port;
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unsigned long flags;
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func_enter ();
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if (!tty) return;
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port = tty->driver_data;
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if (!port) return;
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/* XXX Would the write semaphore do? */
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spin_lock_irqsave (&port->driver_lock, flags);
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port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
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spin_unlock_irqrestore (&port->driver_lock, flags);
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tty_wakeup(tty);
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func_exit ();
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}
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void gs_flush_chars(struct tty_struct * tty)
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{
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struct gs_port *port;
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func_enter ();
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if (!tty) return;
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port = tty->driver_data;
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if (!port) return;
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if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
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!port->xmit_buf) {
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func_exit ();
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return;
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}
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/* Beats me -- REW */
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port->flags |= GS_TX_INTEN;
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port->rd->enable_tx_interrupts (port);
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func_exit ();
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}
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void gs_stop(struct tty_struct * tty)
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{
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struct gs_port *port;
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func_enter ();
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if (!tty) return;
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port = tty->driver_data;
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if (!port) return;
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if (port->xmit_cnt &&
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port->xmit_buf &&
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(port->flags & GS_TX_INTEN) ) {
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port->flags &= ~GS_TX_INTEN;
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port->rd->disable_tx_interrupts (port);
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}
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func_exit ();
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}
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void gs_start(struct tty_struct * tty)
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{
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struct gs_port *port;
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if (!tty) return;
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port = tty->driver_data;
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if (!port) return;
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if (port->xmit_cnt &&
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port->xmit_buf &&
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!(port->flags & GS_TX_INTEN) ) {
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port->flags |= GS_TX_INTEN;
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port->rd->enable_tx_interrupts (port);
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}
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func_exit ();
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}
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static void gs_shutdown_port (struct gs_port *port)
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{
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unsigned long flags;
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func_enter();
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if (!port) return;
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if (!(port->flags & ASYNC_INITIALIZED))
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return;
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spin_lock_irqsave(&port->driver_lock, flags);
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if (port->xmit_buf) {
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free_page((unsigned long) port->xmit_buf);
|
|
|
|
port->xmit_buf = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (port->tty)
|
|
|
|
set_bit(TTY_IO_ERROR, &port->tty->flags);
|
|
|
|
|
|
|
|
port->rd->shutdown_port (port);
|
|
|
|
|
|
|
|
port->flags &= ~ASYNC_INITIALIZED;
|
|
|
|
spin_unlock_irqrestore(&port->driver_lock, flags);
|
|
|
|
|
|
|
|
func_exit();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void gs_hangup(struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
struct gs_port *port;
|
|
|
|
|
|
|
|
func_enter ();
|
|
|
|
|
|
|
|
if (!tty) return;
|
|
|
|
|
|
|
|
port = tty->driver_data;
|
|
|
|
tty = port->tty;
|
|
|
|
if (!tty)
|
|
|
|
return;
|
|
|
|
|
|
|
|
gs_shutdown_port (port);
|
|
|
|
port->flags &= ~(ASYNC_NORMAL_ACTIVE|GS_ACTIVE);
|
|
|
|
port->tty = NULL;
|
|
|
|
port->count = 0;
|
|
|
|
|
|
|
|
wake_up_interruptible(&port->open_wait);
|
|
|
|
func_exit ();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int gs_block_til_ready(void *port_, struct file * filp)
|
|
|
|
{
|
|
|
|
struct gs_port *port = port_;
|
|
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
int retval;
|
|
|
|
int do_clocal = 0;
|
|
|
|
int CD;
|
|
|
|
struct tty_struct *tty;
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
func_enter ();
|
|
|
|
|
|
|
|
if (!port) return 0;
|
|
|
|
|
|
|
|
tty = port->tty;
|
|
|
|
|
|
|
|
if (!tty) return 0;
|
|
|
|
|
|
|
|
gs_dprintk (GS_DEBUG_BTR, "Entering gs_block_till_ready.\n");
|
|
|
|
/*
|
|
|
|
* If the device is in the middle of being closed, then block
|
|
|
|
* until it's done, and then try again.
|
|
|
|
*/
|
|
|
|
if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
|
|
|
|
interruptible_sleep_on(&port->close_wait);
|
|
|
|
if (port->flags & ASYNC_HUP_NOTIFY)
|
|
|
|
return -EAGAIN;
|
|
|
|
else
|
|
|
|
return -ERESTARTSYS;
|
|
|
|
}
|
|
|
|
|
|
|
|
gs_dprintk (GS_DEBUG_BTR, "after hung up\n");
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If non-blocking mode is set, or the port is not enabled,
|
|
|
|
* then make the check up front and then exit.
|
|
|
|
*/
|
|
|
|
if ((filp->f_flags & O_NONBLOCK) ||
|
|
|
|
(tty->flags & (1 << TTY_IO_ERROR))) {
|
|
|
|
port->flags |= ASYNC_NORMAL_ACTIVE;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
gs_dprintk (GS_DEBUG_BTR, "after nonblock\n");
|
|
|
|
|
|
|
|
if (C_CLOCAL(tty))
|
|
|
|
do_clocal = 1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Block waiting for the carrier detect and the line to become
|
|
|
|
* free (i.e., not in use by the callout). While we are in
|
|
|
|
* this loop, port->count is dropped by one, so that
|
|
|
|
* rs_close() knows when to free things. We restore it upon
|
|
|
|
* exit, either normal or abnormal.
|
|
|
|
*/
|
|
|
|
retval = 0;
|
|
|
|
|
|
|
|
add_wait_queue(&port->open_wait, &wait);
|
|
|
|
|
|
|
|
gs_dprintk (GS_DEBUG_BTR, "after add waitq.\n");
|
|
|
|
spin_lock_irqsave(&port->driver_lock, flags);
|
|
|
|
if (!tty_hung_up_p(filp)) {
|
|
|
|
port->count--;
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&port->driver_lock, flags);
|
|
|
|
port->blocked_open++;
|
|
|
|
while (1) {
|
|
|
|
CD = port->rd->get_CD (port);
|
|
|
|
gs_dprintk (GS_DEBUG_BTR, "CD is now %d.\n", CD);
|
|
|
|
set_current_state (TASK_INTERRUPTIBLE);
|
|
|
|
if (tty_hung_up_p(filp) ||
|
|
|
|
!(port->flags & ASYNC_INITIALIZED)) {
|
|
|
|
if (port->flags & ASYNC_HUP_NOTIFY)
|
|
|
|
retval = -EAGAIN;
|
|
|
|
else
|
|
|
|
retval = -ERESTARTSYS;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (!(port->flags & ASYNC_CLOSING) &&
|
|
|
|
(do_clocal || CD))
|
|
|
|
break;
|
|
|
|
gs_dprintk (GS_DEBUG_BTR, "signal_pending is now: %d (%lx)\n",
|
|
|
|
(int)signal_pending (current), *(long*)(¤t->blocked));
|
|
|
|
if (signal_pending(current)) {
|
|
|
|
retval = -ERESTARTSYS;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
schedule();
|
|
|
|
}
|
|
|
|
gs_dprintk (GS_DEBUG_BTR, "Got out of the loop. (%d)\n",
|
|
|
|
port->blocked_open);
|
|
|
|
set_current_state (TASK_RUNNING);
|
|
|
|
remove_wait_queue(&port->open_wait, &wait);
|
|
|
|
if (!tty_hung_up_p(filp)) {
|
|
|
|
port->count++;
|
|
|
|
}
|
|
|
|
port->blocked_open--;
|
|
|
|
if (retval)
|
|
|
|
return retval;
|
|
|
|
|
|
|
|
port->flags |= ASYNC_NORMAL_ACTIVE;
|
|
|
|
func_exit ();
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void gs_close(struct tty_struct * tty, struct file * filp)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
struct gs_port *port;
|
|
|
|
|
|
|
|
func_enter ();
|
|
|
|
|
|
|
|
if (!tty) return;
|
|
|
|
|
|
|
|
port = (struct gs_port *) tty->driver_data;
|
|
|
|
|
|
|
|
if (!port) return;
|
|
|
|
|
|
|
|
if (!port->tty) {
|
|
|
|
/* This seems to happen when this is called from vhangup. */
|
|
|
|
gs_dprintk (GS_DEBUG_CLOSE, "gs: Odd: port->tty is NULL\n");
|
|
|
|
port->tty = tty;
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_lock_irqsave(&port->driver_lock, flags);
|
|
|
|
|
|
|
|
if (tty_hung_up_p(filp)) {
|
|
|
|
spin_unlock_irqrestore(&port->driver_lock, flags);
|
|
|
|
if (port->rd->hungup)
|
|
|
|
port->rd->hungup (port);
|
|
|
|
func_exit ();
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((tty->count == 1) && (port->count != 1)) {
|
|
|
|
printk(KERN_ERR "gs: gs_close port %p: bad port count;"
|
|
|
|
" tty->count is 1, port count is %d\n", port, port->count);
|
|
|
|
port->count = 1;
|
|
|
|
}
|
|
|
|
if (--port->count < 0) {
|
|
|
|
printk(KERN_ERR "gs: gs_close port %p: bad port count: %d\n", port, port->count);
|
|
|
|
port->count = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (port->count) {
|
|
|
|
gs_dprintk(GS_DEBUG_CLOSE, "gs_close port %p: count: %d\n", port, port->count);
|
|
|
|
spin_unlock_irqrestore(&port->driver_lock, flags);
|
|
|
|
func_exit ();
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
port->flags |= ASYNC_CLOSING;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Now we wait for the transmit buffer to clear; and we notify
|
|
|
|
* the line discipline to only process XON/XOFF characters.
|
|
|
|
*/
|
|
|
|
tty->closing = 1;
|
|
|
|
/* if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
|
|
|
|
tty_wait_until_sent(tty, port->closing_wait); */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* At this point we stop accepting input. To do this, we
|
|
|
|
* disable the receive line status interrupts, and tell the
|
|
|
|
* interrupt driver to stop checking the data ready bit in the
|
|
|
|
* line status register.
|
|
|
|
*/
|
|
|
|
|
|
|
|
port->rd->disable_rx_interrupts (port);
|
|
|
|
spin_unlock_irqrestore(&port->driver_lock, flags);
|
|
|
|
|
|
|
|
/* close has no way of returning "EINTR", so discard return value */
|
|
|
|
if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
|
|
|
|
gs_wait_tx_flushed (port, port->closing_wait);
|
|
|
|
|
|
|
|
port->flags &= ~GS_ACTIVE;
|
|
|
|
|
2008-04-30 03:53:59 -04:00
|
|
|
gs_flush_buffer(tty);
|
2005-04-16 18:20:36 -04:00
|
|
|
|
|
|
|
tty_ldisc_flush(tty);
|
|
|
|
tty->closing = 0;
|
|
|
|
|
|
|
|
port->event = 0;
|
|
|
|
port->rd->close (port);
|
|
|
|
port->rd->shutdown_port (port);
|
|
|
|
port->tty = NULL;
|
|
|
|
|
|
|
|
if (port->blocked_open) {
|
|
|
|
if (port->close_delay) {
|
|
|
|
spin_unlock_irqrestore(&port->driver_lock, flags);
|
|
|
|
msleep_interruptible(jiffies_to_msecs(port->close_delay));
|
|
|
|
spin_lock_irqsave(&port->driver_lock, flags);
|
|
|
|
}
|
|
|
|
wake_up_interruptible(&port->open_wait);
|
|
|
|
}
|
|
|
|
port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING | ASYNC_INITIALIZED);
|
|
|
|
wake_up_interruptible(&port->close_wait);
|
|
|
|
|
|
|
|
func_exit ();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void gs_set_termios (struct tty_struct * tty,
|
2006-12-08 05:38:45 -05:00
|
|
|
struct ktermios * old_termios)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
|
|
|
struct gs_port *port;
|
|
|
|
int baudrate, tmp, rv;
|
2006-12-08 05:38:45 -05:00
|
|
|
struct ktermios *tiosp;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
|
|
|
func_enter();
|
|
|
|
|
|
|
|
if (!tty) return;
|
|
|
|
|
|
|
|
port = tty->driver_data;
|
|
|
|
|
|
|
|
if (!port) return;
|
|
|
|
if (!port->tty) {
|
|
|
|
/* This seems to happen when this is called after gs_close. */
|
|
|
|
gs_dprintk (GS_DEBUG_TERMIOS, "gs: Odd: port->tty is NULL\n");
|
|
|
|
port->tty = tty;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
tiosp = tty->termios;
|
|
|
|
|
|
|
|
if (gs_debug & GS_DEBUG_TERMIOS) {
|
|
|
|
gs_dprintk (GS_DEBUG_TERMIOS, "termios structure (%p):\n", tiosp);
|
|
|
|
}
|
|
|
|
|
|
|
|
if(old_termios && (gs_debug & GS_DEBUG_TERMIOS)) {
|
|
|
|
if(tiosp->c_iflag != old_termios->c_iflag) printk("c_iflag changed\n");
|
|
|
|
if(tiosp->c_oflag != old_termios->c_oflag) printk("c_oflag changed\n");
|
|
|
|
if(tiosp->c_cflag != old_termios->c_cflag) printk("c_cflag changed\n");
|
|
|
|
if(tiosp->c_lflag != old_termios->c_lflag) printk("c_lflag changed\n");
|
|
|
|
if(tiosp->c_line != old_termios->c_line) printk("c_line changed\n");
|
|
|
|
if(!memcmp(tiosp->c_cc, old_termios->c_cc, NCC)) printk("c_cc changed\n");
|
|
|
|
}
|
|
|
|
|
2006-09-29 05:01:38 -04:00
|
|
|
baudrate = tty_get_baud_rate(tty);
|
2005-04-16 18:20:36 -04:00
|
|
|
|
|
|
|
if ((tiosp->c_cflag & CBAUD) == B38400) {
|
|
|
|
if ( (port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
|
|
|
|
baudrate = 57600;
|
|
|
|
else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
|
|
|
|
baudrate = 115200;
|
|
|
|
else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
|
|
|
|
baudrate = 230400;
|
|
|
|
else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
|
|
|
|
baudrate = 460800;
|
|
|
|
else if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)
|
|
|
|
baudrate = (port->baud_base / port->custom_divisor);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* I recommend using THIS instead of the mess in termios (and
|
|
|
|
duplicating the above code). Next we should create a clean
|
|
|
|
interface towards this variable. If your card supports arbitrary
|
|
|
|
baud rates, (e.g. CD1400 or 16550 based cards) then everything
|
|
|
|
will be very easy..... */
|
|
|
|
port->baud = baudrate;
|
|
|
|
|
|
|
|
/* Two timer ticks seems enough to wakeup something like SLIP driver */
|
|
|
|
/* Baudrate/10 is cps. Divide by HZ to get chars per tick. */
|
|
|
|
tmp = (baudrate / 10 / HZ) * 2;
|
|
|
|
|
|
|
|
if (tmp < 0) tmp = 0;
|
|
|
|
if (tmp >= SERIAL_XMIT_SIZE) tmp = SERIAL_XMIT_SIZE-1;
|
|
|
|
|
|
|
|
port->wakeup_chars = tmp;
|
|
|
|
|
|
|
|
/* We should really wait for the characters to be all sent before
|
|
|
|
changing the settings. -- CAL */
|
|
|
|
rv = gs_wait_tx_flushed (port, MAX_SCHEDULE_TIMEOUT);
|
|
|
|
if (rv < 0) return /* rv */;
|
|
|
|
|
|
|
|
rv = port->rd->set_real_termios(port);
|
|
|
|
if (rv < 0) return /* rv */;
|
|
|
|
|
|
|
|
if ((!old_termios ||
|
|
|
|
(old_termios->c_cflag & CRTSCTS)) &&
|
|
|
|
!( tiosp->c_cflag & CRTSCTS)) {
|
|
|
|
tty->stopped = 0;
|
|
|
|
gs_start(tty);
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef tytso_patch_94Nov25_1726
|
|
|
|
/* This "makes sense", Why is it commented out? */
|
|
|
|
|
|
|
|
if (!(old_termios->c_cflag & CLOCAL) &&
|
|
|
|
(tty->termios->c_cflag & CLOCAL))
|
|
|
|
wake_up_interruptible(&port->gs.open_wait);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
func_exit();
|
|
|
|
return /* 0 */;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Must be called with interrupts enabled */
|
|
|
|
int gs_init_port(struct gs_port *port)
|
|
|
|
{
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
func_enter ();
|
|
|
|
|
|
|
|
if (port->flags & ASYNC_INITIALIZED) {
|
|
|
|
func_exit ();
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
if (!port->xmit_buf) {
|
|
|
|
/* We may sleep in get_zeroed_page() */
|
|
|
|
unsigned long tmp;
|
|
|
|
|
|
|
|
tmp = get_zeroed_page(GFP_KERNEL);
|
|
|
|
spin_lock_irqsave (&port->driver_lock, flags);
|
|
|
|
if (port->xmit_buf)
|
|
|
|
free_page (tmp);
|
|
|
|
else
|
|
|
|
port->xmit_buf = (unsigned char *) tmp;
|
|
|
|
spin_unlock_irqrestore(&port->driver_lock, flags);
|
|
|
|
if (!port->xmit_buf) {
|
|
|
|
func_exit ();
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_lock_irqsave (&port->driver_lock, flags);
|
|
|
|
if (port->tty)
|
|
|
|
clear_bit(TTY_IO_ERROR, &port->tty->flags);
|
2006-03-23 06:00:44 -05:00
|
|
|
mutex_init(&port->port_write_mutex);
|
2005-04-16 18:20:36 -04:00
|
|
|
port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
|
|
|
|
spin_unlock_irqrestore(&port->driver_lock, flags);
|
|
|
|
gs_set_termios(port->tty, NULL);
|
|
|
|
spin_lock_irqsave (&port->driver_lock, flags);
|
|
|
|
port->flags |= ASYNC_INITIALIZED;
|
|
|
|
port->flags &= ~GS_TX_INTEN;
|
|
|
|
|
|
|
|
spin_unlock_irqrestore(&port->driver_lock, flags);
|
|
|
|
func_exit ();
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
int gs_setserial(struct gs_port *port, struct serial_struct __user *sp)
|
|
|
|
{
|
|
|
|
struct serial_struct sio;
|
|
|
|
|
|
|
|
if (copy_from_user(&sio, sp, sizeof(struct serial_struct)))
|
|
|
|
return(-EFAULT);
|
|
|
|
|
|
|
|
if (!capable(CAP_SYS_ADMIN)) {
|
|
|
|
if ((sio.baud_base != port->baud_base) ||
|
|
|
|
(sio.close_delay != port->close_delay) ||
|
|
|
|
((sio.flags & ~ASYNC_USR_MASK) !=
|
|
|
|
(port->flags & ~ASYNC_USR_MASK)))
|
|
|
|
return(-EPERM);
|
|
|
|
}
|
|
|
|
|
|
|
|
port->flags = (port->flags & ~ASYNC_USR_MASK) |
|
|
|
|
(sio.flags & ASYNC_USR_MASK);
|
|
|
|
|
|
|
|
port->baud_base = sio.baud_base;
|
|
|
|
port->close_delay = sio.close_delay;
|
|
|
|
port->closing_wait = sio.closing_wait;
|
|
|
|
port->custom_divisor = sio.custom_divisor;
|
|
|
|
|
|
|
|
gs_set_termios (port->tty, NULL);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*****************************************************************************/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Generate the serial struct info.
|
|
|
|
*/
|
|
|
|
|
|
|
|
int gs_getserial(struct gs_port *port, struct serial_struct __user *sp)
|
|
|
|
{
|
|
|
|
struct serial_struct sio;
|
|
|
|
|
|
|
|
memset(&sio, 0, sizeof(struct serial_struct));
|
|
|
|
sio.flags = port->flags;
|
|
|
|
sio.baud_base = port->baud_base;
|
|
|
|
sio.close_delay = port->close_delay;
|
|
|
|
sio.closing_wait = port->closing_wait;
|
|
|
|
sio.custom_divisor = port->custom_divisor;
|
|
|
|
sio.hub6 = 0;
|
|
|
|
|
|
|
|
/* If you want you can override these. */
|
|
|
|
sio.type = PORT_UNKNOWN;
|
|
|
|
sio.xmit_fifo_size = -1;
|
|
|
|
sio.line = -1;
|
|
|
|
sio.port = -1;
|
|
|
|
sio.irq = -1;
|
|
|
|
|
|
|
|
if (port->rd->getserial)
|
|
|
|
port->rd->getserial (port, &sio);
|
|
|
|
|
|
|
|
if (copy_to_user(sp, &sio, sizeof(struct serial_struct)))
|
|
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void gs_got_break(struct gs_port *port)
|
|
|
|
{
|
|
|
|
func_enter ();
|
|
|
|
|
|
|
|
tty_insert_flip_char(port->tty, 0, TTY_BREAK);
|
|
|
|
tty_schedule_flip(port->tty);
|
|
|
|
if (port->flags & ASYNC_SAK) {
|
|
|
|
do_SAK (port->tty);
|
|
|
|
}
|
|
|
|
|
|
|
|
func_exit ();
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
EXPORT_SYMBOL(gs_put_char);
|
|
|
|
EXPORT_SYMBOL(gs_write);
|
|
|
|
EXPORT_SYMBOL(gs_write_room);
|
|
|
|
EXPORT_SYMBOL(gs_chars_in_buffer);
|
|
|
|
EXPORT_SYMBOL(gs_flush_buffer);
|
|
|
|
EXPORT_SYMBOL(gs_flush_chars);
|
|
|
|
EXPORT_SYMBOL(gs_stop);
|
|
|
|
EXPORT_SYMBOL(gs_start);
|
|
|
|
EXPORT_SYMBOL(gs_hangup);
|
|
|
|
EXPORT_SYMBOL(gs_block_til_ready);
|
|
|
|
EXPORT_SYMBOL(gs_close);
|
|
|
|
EXPORT_SYMBOL(gs_set_termios);
|
|
|
|
EXPORT_SYMBOL(gs_init_port);
|
|
|
|
EXPORT_SYMBOL(gs_setserial);
|
|
|
|
EXPORT_SYMBOL(gs_getserial);
|
|
|
|
EXPORT_SYMBOL(gs_got_break);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|