56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
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/*
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* Tty port functions
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/wait.h>
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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void tty_port_init(struct tty_port *port)
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{
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memset(port, 0, sizeof(*port));
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init_waitqueue_head(&port->open_wait);
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init_waitqueue_head(&port->close_wait);
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mutex_init(&port->mutex);
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port->close_delay = (50 * HZ) / 100;
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port->closing_wait = (3000 * HZ) / 100;
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}
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EXPORT_SYMBOL(tty_port_init);
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int tty_port_alloc_xmit_buf(struct tty_port *port)
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{
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/* We may sleep in get_zeroed_page() */
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mutex_lock(&port->mutex);
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if (port->xmit_buf == NULL)
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port->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
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mutex_unlock(&port->mutex);
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if (port->xmit_buf == NULL)
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return -ENOMEM;
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return 0;
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}
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EXPORT_SYMBOL(tty_port_alloc_xmit_buf);
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void tty_port_free_xmit_buf(struct tty_port *port)
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{
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mutex_lock(&port->mutex);
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if (port->xmit_buf != NULL) {
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free_page((unsigned long)port->xmit_buf);
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port->xmit_buf = NULL;
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}
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mutex_unlock(&port->mutex);
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}
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EXPORT_SYMBOL(tty_port_free_xmit_buf);
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