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authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/drivers/tty/tty_port.c
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/drivers/tty/tty_port.c')
-rw-r--r--ANDROID_3.4.5/drivers/tty/tty_port.c448
1 files changed, 0 insertions, 448 deletions
diff --git a/ANDROID_3.4.5/drivers/tty/tty_port.c b/ANDROID_3.4.5/drivers/tty/tty_port.c
deleted file mode 100644
index bf6e2381..00000000
--- a/ANDROID_3.4.5/drivers/tty/tty_port.c
+++ /dev/null
@@ -1,448 +0,0 @@
-/*
- * Tty port functions
- */
-
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/tty.h>
-#include <linux/tty_driver.h>
-#include <linux/tty_flip.h>
-#include <linux/serial.h>
-#include <linux/timer.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/sched.h>
-#include <linux/init.h>
-#include <linux/wait.h>
-#include <linux/bitops.h>
-#include <linux/delay.h>
-#include <linux/module.h>
-
-void tty_port_init(struct tty_port *port)
-{
- memset(port, 0, sizeof(*port));
- init_waitqueue_head(&port->open_wait);
- init_waitqueue_head(&port->close_wait);
- init_waitqueue_head(&port->delta_msr_wait);
- mutex_init(&port->mutex);
- mutex_init(&port->buf_mutex);
- spin_lock_init(&port->lock);
- port->close_delay = (50 * HZ) / 100;
- port->closing_wait = (3000 * HZ) / 100;
- kref_init(&port->kref);
-}
-EXPORT_SYMBOL(tty_port_init);
-
-int tty_port_alloc_xmit_buf(struct tty_port *port)
-{
- /* We may sleep in get_zeroed_page() */
- mutex_lock(&port->buf_mutex);
- if (port->xmit_buf == NULL)
- port->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
- mutex_unlock(&port->buf_mutex);
- if (port->xmit_buf == NULL)
- return -ENOMEM;
- return 0;
-}
-EXPORT_SYMBOL(tty_port_alloc_xmit_buf);
-
-void tty_port_free_xmit_buf(struct tty_port *port)
-{
- mutex_lock(&port->buf_mutex);
- if (port->xmit_buf != NULL) {
- free_page((unsigned long)port->xmit_buf);
- port->xmit_buf = NULL;
- }
- mutex_unlock(&port->buf_mutex);
-}
-EXPORT_SYMBOL(tty_port_free_xmit_buf);
-
-static void tty_port_destructor(struct kref *kref)
-{
- struct tty_port *port = container_of(kref, struct tty_port, kref);
- if (port->xmit_buf)
- free_page((unsigned long)port->xmit_buf);
- if (port->ops->destruct)
- port->ops->destruct(port);
- else
- kfree(port);
-}
-
-void tty_port_put(struct tty_port *port)
-{
- if (port)
- kref_put(&port->kref, tty_port_destructor);
-}
-EXPORT_SYMBOL(tty_port_put);
-
-/**
- * tty_port_tty_get - get a tty reference
- * @port: tty port
- *
- * Return a refcount protected tty instance or NULL if the port is not
- * associated with a tty (eg due to close or hangup)
- */
-
-struct tty_struct *tty_port_tty_get(struct tty_port *port)
-{
- unsigned long flags;
- struct tty_struct *tty;
-
- spin_lock_irqsave(&port->lock, flags);
- tty = tty_kref_get(port->tty);
- spin_unlock_irqrestore(&port->lock, flags);
- return tty;
-}
-EXPORT_SYMBOL(tty_port_tty_get);
-
-/**
- * tty_port_tty_set - set the tty of a port
- * @port: tty port
- * @tty: the tty
- *
- * Associate the port and tty pair. Manages any internal refcounts.
- * Pass NULL to deassociate a port
- */
-
-void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&port->lock, flags);
- if (port->tty)
- tty_kref_put(port->tty);
- port->tty = tty_kref_get(tty);
- spin_unlock_irqrestore(&port->lock, flags);
-}
-EXPORT_SYMBOL(tty_port_tty_set);
-
-static void tty_port_shutdown(struct tty_port *port)
-{
- mutex_lock(&port->mutex);
- if (port->ops->shutdown && !port->console &&
- test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags))
- port->ops->shutdown(port);
- mutex_unlock(&port->mutex);
-}
-
-/**
- * tty_port_hangup - hangup helper
- * @port: tty port
- *
- * Perform port level tty hangup flag and count changes. Drop the tty
- * reference.
- */
-
-void tty_port_hangup(struct tty_port *port)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&port->lock, flags);
- port->count = 0;
- port->flags &= ~ASYNC_NORMAL_ACTIVE;
- if (port->tty) {
- set_bit(TTY_IO_ERROR, &port->tty->flags);
- tty_kref_put(port->tty);
- }
- port->tty = NULL;
- spin_unlock_irqrestore(&port->lock, flags);
- wake_up_interruptible(&port->open_wait);
- wake_up_interruptible(&port->delta_msr_wait);
- tty_port_shutdown(port);
-}
-EXPORT_SYMBOL(tty_port_hangup);
-
-/**
- * tty_port_carrier_raised - carrier raised check
- * @port: tty port
- *
- * Wrapper for the carrier detect logic. For the moment this is used
- * to hide some internal details. This will eventually become entirely
- * internal to the tty port.
- */
-
-int tty_port_carrier_raised(struct tty_port *port)
-{
- if (port->ops->carrier_raised == NULL)
- return 1;
- return port->ops->carrier_raised(port);
-}
-EXPORT_SYMBOL(tty_port_carrier_raised);
-
-/**
- * tty_port_raise_dtr_rts - Raise DTR/RTS
- * @port: tty port
- *
- * Wrapper for the DTR/RTS raise logic. For the moment this is used
- * to hide some internal details. This will eventually become entirely
- * internal to the tty port.
- */
-
-void tty_port_raise_dtr_rts(struct tty_port *port)
-{
- if (port->ops->dtr_rts)
- port->ops->dtr_rts(port, 1);
-}
-EXPORT_SYMBOL(tty_port_raise_dtr_rts);
-
-/**
- * tty_port_lower_dtr_rts - Lower DTR/RTS
- * @port: tty port
- *
- * Wrapper for the DTR/RTS raise logic. For the moment this is used
- * to hide some internal details. This will eventually become entirely
- * internal to the tty port.
- */
-
-void tty_port_lower_dtr_rts(struct tty_port *port)
-{
- if (port->ops->dtr_rts)
- port->ops->dtr_rts(port, 0);
-}
-EXPORT_SYMBOL(tty_port_lower_dtr_rts);
-
-/**
- * tty_port_block_til_ready - Waiting logic for tty open
- * @port: the tty port being opened
- * @tty: the tty device being bound
- * @filp: the file pointer of the opener
- *
- * Implement the core POSIX/SuS tty behaviour when opening a tty device.
- * Handles:
- * - hangup (both before and during)
- * - non blocking open
- * - rts/dtr/dcd
- * - signals
- * - port flags and counts
- *
- * The passed tty_port must implement the carrier_raised method if it can
- * do carrier detect and the dtr_rts method if it supports software
- * management of these lines. Note that the dtr/rts raise is done each
- * iteration as a hangup may have previously dropped them while we wait.
- */
-
-int tty_port_block_til_ready(struct tty_port *port,
- struct tty_struct *tty, struct file *filp)
-{
- int do_clocal = 0, retval;
- unsigned long flags;
- DEFINE_WAIT(wait);
-
- /* block if port is in the process of being closed */
- if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
- wait_event_interruptible_tty(port->close_wait,
- !(port->flags & ASYNC_CLOSING));
- if (port->flags & ASYNC_HUP_NOTIFY)
- return -EAGAIN;
- else
- return -ERESTARTSYS;
- }
-
- /* if non-blocking mode is set we can pass directly to open unless
- the port has just hung up or is in another error state */
- if (tty->flags & (1 << TTY_IO_ERROR)) {
- port->flags |= ASYNC_NORMAL_ACTIVE;
- return 0;
- }
- if (filp->f_flags & O_NONBLOCK) {
- /* Indicate we are open */
- if (tty->termios->c_cflag & CBAUD)
- tty_port_raise_dtr_rts(port);
- port->flags |= ASYNC_NORMAL_ACTIVE;
- return 0;
- }
-
- if (C_CLOCAL(tty))
- do_clocal = 1;
-
- /* Block waiting until we can proceed. We may need to wait for the
- carrier, but we must also wait for any close that is in progress
- before the next open may complete */
-
- retval = 0;
-
- /* The port lock protects the port counts */
- spin_lock_irqsave(&port->lock, flags);
- if (!tty_hung_up_p(filp))
- port->count--;
- port->blocked_open++;
- spin_unlock_irqrestore(&port->lock, flags);
-
- while (1) {
- /* Indicate we are open */
- if (tty->termios->c_cflag & CBAUD)
- tty_port_raise_dtr_rts(port);
-
- prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);
- /* Check for a hangup or uninitialised port.
- Return accordingly */
- if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
- if (port->flags & ASYNC_HUP_NOTIFY)
- retval = -EAGAIN;
- else
- retval = -ERESTARTSYS;
- break;
- }
- /*
- * Probe the carrier. For devices with no carrier detect
- * tty_port_carrier_raised will always return true.
- * Never ask drivers if CLOCAL is set, this causes troubles
- * on some hardware.
- */
- if (!(port->flags & ASYNC_CLOSING) &&
- (do_clocal || tty_port_carrier_raised(port)))
- break;
- if (signal_pending(current)) {
- retval = -ERESTARTSYS;
- break;
- }
- tty_unlock();
- schedule();
- tty_lock();
- }
- finish_wait(&port->open_wait, &wait);
-
- /* Update counts. A parallel hangup will have set count to zero and
- we must not mess that up further */
- spin_lock_irqsave(&port->lock, flags);
- if (!tty_hung_up_p(filp))
- port->count++;
- port->blocked_open--;
- if (retval == 0)
- port->flags |= ASYNC_NORMAL_ACTIVE;
- spin_unlock_irqrestore(&port->lock, flags);
- return retval;
-}
-EXPORT_SYMBOL(tty_port_block_til_ready);
-
-int tty_port_close_start(struct tty_port *port,
- struct tty_struct *tty, struct file *filp)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&port->lock, flags);
- if (tty_hung_up_p(filp)) {
- spin_unlock_irqrestore(&port->lock, flags);
- return 0;
- }
-
- if (tty->count == 1 && port->count != 1) {
- printk(KERN_WARNING
- "tty_port_close_start: tty->count = 1 port count = %d.\n",
- port->count);
- port->count = 1;
- }
- if (--port->count < 0) {
- printk(KERN_WARNING "tty_port_close_start: count = %d\n",
- port->count);
- port->count = 0;
- }
-
- if (port->count) {
- spin_unlock_irqrestore(&port->lock, flags);
- if (port->ops->drop)
- port->ops->drop(port);
- return 0;
- }
- set_bit(ASYNCB_CLOSING, &port->flags);
- tty->closing = 1;
- spin_unlock_irqrestore(&port->lock, flags);
- /* Don't block on a stalled port, just pull the chain */
- if (tty->flow_stopped)
- tty_driver_flush_buffer(tty);
- if (test_bit(ASYNCB_INITIALIZED, &port->flags) &&
- port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
- tty_wait_until_sent_from_close(tty, port->closing_wait);
- if (port->drain_delay) {
- unsigned int bps = tty_get_baud_rate(tty);
- long timeout;
-
- if (bps > 1200)
- timeout = max_t(long,
- (HZ * 10 * port->drain_delay) / bps, HZ / 10);
- else
- timeout = 2 * HZ;
- schedule_timeout_interruptible(timeout);
- }
- /* Flush the ldisc buffering */
- tty_ldisc_flush(tty);
-
- /* Drop DTR/RTS if HUPCL is set. This causes any attached modem to
- hang up the line */
- if (tty->termios->c_cflag & HUPCL)
- tty_port_lower_dtr_rts(port);
-
- /* Don't call port->drop for the last reference. Callers will want
- to drop the last active reference in ->shutdown() or the tty
- shutdown path */
- return 1;
-}
-EXPORT_SYMBOL(tty_port_close_start);
-
-void tty_port_close_end(struct tty_port *port, struct tty_struct *tty)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&port->lock, flags);
- tty->closing = 0;
-
- if (port->blocked_open) {
- spin_unlock_irqrestore(&port->lock, flags);
- if (port->close_delay) {
- msleep_interruptible(
- jiffies_to_msecs(port->close_delay));
- }
- spin_lock_irqsave(&port->lock, flags);
- wake_up_interruptible(&port->open_wait);
- }
- port->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
- wake_up_interruptible(&port->close_wait);
- spin_unlock_irqrestore(&port->lock, flags);
-}
-EXPORT_SYMBOL(tty_port_close_end);
-
-void tty_port_close(struct tty_port *port, struct tty_struct *tty,
- struct file *filp)
-{
- if (tty_port_close_start(port, tty, filp) == 0)
- return;
- tty_port_shutdown(port);
- set_bit(TTY_IO_ERROR, &tty->flags);
- tty_port_close_end(port, tty);
- tty_port_tty_set(port, NULL);
-}
-EXPORT_SYMBOL(tty_port_close);
-
-int tty_port_open(struct tty_port *port, struct tty_struct *tty,
- struct file *filp)
-{
- spin_lock_irq(&port->lock);
- if (!tty_hung_up_p(filp))
- ++port->count;
- spin_unlock_irq(&port->lock);
- tty_port_tty_set(port, tty);
-
- /*
- * Do the device-specific open only if the hardware isn't
- * already initialized. Serialize open and shutdown using the
- * port mutex.
- */
-
- mutex_lock(&port->mutex);
-
- if (!test_bit(ASYNCB_INITIALIZED, &port->flags)) {
- clear_bit(TTY_IO_ERROR, &tty->flags);
- if (port->ops->activate) {
- int retval = port->ops->activate(port, tty);
- if (retval) {
- mutex_unlock(&port->mutex);
- return retval;
- }
- }
- set_bit(ASYNCB_INITIALIZED, &port->flags);
- }
- mutex_unlock(&port->mutex);
- return tty_port_block_til_ready(port, tty, filp);
-}
-
-EXPORT_SYMBOL(tty_port_open);