static void acm_port_down(struct acm *acm, int drain)
{
int i, nr = acm->rx_buflimit;
mutex_lock(&open_mutex);
if (acm->dev) {
usb_autopm_get_interface(acm->control);
acm_set_control(acm, acm->ctrlout = 0);
/* try letting the last writes drain naturally */
if (drain) {
wait_event_interruptible_timeout(acm->drain_wait,
(ACM_NW == acm_wb_is_avail(acm)) || !acm->dev,
ACM_CLOSE_TIMEOUT * HZ);
}
usb_kill_urb(acm->ctrlurb);
for (i = 0; i < ACM_NW; i++)
usb_kill_urb(acm->wb[i].urb);
tasklet_disable(&acm->urb_task);
for (i = 0; i < nr; i++)
usb_kill_urb(acm->ru[i].urb);
tasklet_enable(&acm->urb_task);
acm->control->needs_remote_wakeup = 0;
usb_autopm_put_interface(acm->control);
}
mutex_unlock(&open_mutex);
}
static void acm_tty_close(struct tty_struct *tty, struct file *filp)
{
struct acm *acm = tty->driver_data;
int i,nr;
if (!acm || !acm->used)
return;
nr = acm->rx_buflimit;
mutex_lock(&open_mutex);
if (!--acm->used) {
if (acm->dev) {
usb_autopm_get_interface(acm->control);
acm_set_control(acm, acm->ctrlout = 0);
/* try letting the last writes drain naturally */
wait_event_interruptible_timeout(acm->drain_wait,
(ACM_NW == acm_wb_is_avail(acm))
|| !acm->dev,
ACM_CLOSE_TIMEOUT * HZ);
usb_kill_urb(acm->ctrlurb);
for (i = 0; i < ACM_NW; i++)
usb_kill_urb(acm->wb[i].urb);
for (i = 0; i < nr; i++)
usb_kill_urb(acm->ru[i].urb);
acm->control->needs_remote_wakeup = 0;
usb_autopm_put_interface(acm->control);
} else
acm_tty_unregister(acm);
}
mutex_unlock(&open_mutex);
}
static int acm_tty_chars_in_buffer(struct tty_struct *tty)
{
struct acm *acm = tty->driver_data;
if (acm->disconnected)
return 0;
return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
}
static int acm_tty_write_room(struct tty_struct *tty)
{
struct acm *acm = tty->driver_data;
/*
* Do not let the line discipline to know that we have a reserve,
* or it might get too enthusiastic.
*/
return acm_wb_is_avail(acm) ? acm->writesize : 0;
}
static int acm_tty_chars_in_buffer(struct tty_struct *tty)
{
struct acm *acm = tty->driver_data;
if (!ACM_READY(acm))
return -EINVAL;
/*
* This is inaccurate (overcounts), but it works.
*/
return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
}
static int acm_tty_chars_in_buffer(struct tty_struct *tty)
{
struct acm *acm = tty->driver_data;
/*
* if the device was unplugged then any remaining characters fell out
* of the connector ;)
*/
if (acm->disconnected)
return 0;
/*
* This is inaccurate (overcounts), but it works.
*/
return (ACM_NW - acm_wb_is_avail(acm)) * acm->writesize;
}
static int acm_write_start(struct acm *acm, int wbn)
{
unsigned long flags;
struct acm_wb *wb;
int rc;
spin_lock_irqsave(&acm->write_lock, flags);
if (!acm->dev) {
spin_unlock_irqrestore(&acm->write_lock, flags);
return -ENODEV;
}
if (!acm->write_ready) {
spin_unlock_irqrestore(&acm->write_lock, flags);
return 0; /* A white lie */
}
wb = &acm->wb[wbn];
if(acm_wb_is_avail(acm) <= 1)
acm->write_ready = 0;
dbg("%s susp_count: %d", __FUNCTION__, acm->susp_count);
if (acm->susp_count) {
acm->old_ready = acm->write_ready;
acm->delayed_wb = wb;
acm->write_ready = 0;
schedule_work(&acm->waker);
spin_unlock_irqrestore(&acm->write_lock, flags);
return 0; /* A white lie */
}
usb_mark_last_busy(acm->dev);
if (!acm_wb_is_used(acm, wbn)) {
spin_unlock_irqrestore(&acm->write_lock, flags);
return 0;
}
rc = acm_start_wb(acm, wb);
spin_unlock_irqrestore(&acm->write_lock, flags);
return rc;
}
/*
* Poke write.
*/
static int acm_write_start(struct acm *acm, int wbn)
{
unsigned long flags;
struct acm_wb *wb;
int rc;
spin_lock_irqsave(&acm->write_lock, flags);
if (!acm->dev) {
spin_unlock_irqrestore(&acm->write_lock, flags);
return -ENODEV;
}
if (!acm->write_ready) {
spin_unlock_irqrestore(&acm->write_lock, flags);
return 0; /* A white lie */
}
if (!acm_wb_is_used(acm, wbn)) {
spin_unlock_irqrestore(&acm->write_lock, flags);
return 0;
}
wb = &acm->wb[wbn];
if(acm_wb_is_avail(acm) <= 1)
acm->write_ready = 0;
spin_unlock_irqrestore(&acm->write_lock, flags);
wb->urb->transfer_buffer = wb->buf;
wb->urb->transfer_dma = wb->dmah;
wb->urb->transfer_buffer_length = wb->len;
wb->urb->dev = acm->dev;
if ((rc = usb_submit_urb(wb->urb, GFP_ATOMIC)) < 0) {
dbg("usb_submit_urb(write bulk) failed: %d", rc);
acm_write_done(acm, wb);
}
return rc;
}
static int acm_tty_write_room(struct tty_struct *tty)
{
struct acm *acm = tty->driver_data;
return acm_wb_is_avail(acm) ? acm->writesize : 0;
}
