static void mct_u232_read_int_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct mct_u232_private *priv = usb_get_serial_port_data(port);
struct usb_serial *serial = port->serial;
struct tty_struct *tty;
unsigned char *data = urb->transfer_buffer;
int retval;
int status = urb->status;
unsigned long flags;
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d",
__func__, status);
return;
default:
dbg("%s - nonzero urb status received: %d",
__func__, status);
goto exit;
}
if (!serial) {
dbg("%s - bad serial pointer, exiting", __func__);
return;
}
dbg("%s - port %d", __func__, port->number);
usb_serial_debug_data(debug, &port->dev, __func__,
urb->actual_length, data);
/*
* Work-a-round: handle the 'usual' bulk-in pipe here
*/
if (urb->transfer_buffer_length > 2) {
if (urb->actual_length) {
tty = tty_port_tty_get(&port->port);
if (tty) {
tty_insert_flip_string(tty, data,
urb->actual_length);
tty_flip_buffer_push(tty);
}
tty_kref_put(tty);
}
goto exit;
}
/*
* The interrupt-in pipe signals exceptional conditions (modem line
* signal changes and errors). data[0] holds MSR, data[1] holds LSR.
*/
spin_lock_irqsave(&priv->lock, flags);
priv->last_msr = data[MCT_U232_MSR_INDEX];
/* Record Control Line states */
mct_u232_msr_to_state(&priv->control_state, priv->last_msr);
#if 0
/* Not yet handled. See belkin_sa.c for further information */
/* Now to report any errors */
priv->last_lsr = data[MCT_U232_LSR_INDEX];
/*
* fill in the flip buffer here, but I do not know the relation
* to the current/next receive buffer or characters. I need
* to look in to this before committing any code.
*/
if (priv->last_lsr & MCT_U232_LSR_ERR) {
tty = tty_port_tty_get(&port->port);
/* Overrun Error */
if (priv->last_lsr & MCT_U232_LSR_OE) {
}
/* Parity Error */
if (priv->last_lsr & MCT_U232_LSR_PE) {
}
/* Framing Error */
if (priv->last_lsr & MCT_U232_LSR_FE) {
}
/* Break Indicator */
if (priv->last_lsr & MCT_U232_LSR_BI) {
}
tty_kref_put(tty);
}
#endif
spin_unlock_irqrestore(&priv->lock, flags);
exit:
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval)
dev_err(&port->dev,
"%s - usb_submit_urb failed with result %d\n",
__func__, retval);
} /* mct_u232_read_int_callback */
/*
* This creates a new process as a copy of the old one,
* but does not actually start it yet.
*
* It copies the registers, and all the appropriate
* parts of the process environment (as per the clone
* flags). The actual kick-off is left to the caller.
*/
static struct task_struct *copy_process(unsigned long clone_flags,
unsigned long stack_start,
struct pt_regs *regs,
unsigned long stack_size,
int __user *child_tidptr,
struct pid *pid,
int trace)
{
int retval;
struct task_struct *p;
int cgroup_callbacks_done = 0;
if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == (CLONE_NEWNS|CLONE_FS))
return ERR_PTR(-EINVAL);
/*
* Thread groups must share signals as well, and detached threads
* can only be started up within the thread group.
*/
if ((clone_flags & CLONE_THREAD) && !(clone_flags & CLONE_SIGHAND))
return ERR_PTR(-EINVAL);
/*
* Shared signal handlers imply shared VM. By way of the above,
* thread groups also imply shared VM. Blocking this case allows
* for various simplifications in other code.
*/
if ((clone_flags & CLONE_SIGHAND) && !(clone_flags & CLONE_VM))
return ERR_PTR(-EINVAL);
/*
* Siblings of global init remain as zombies on exit since they are
* not reaped by their parent (swapper). To solve this and to avoid
* multi-rooted process trees, prevent global and container-inits
* from creating siblings.
*/
if ((clone_flags & CLONE_PARENT) &&
current->signal->flags & SIGNAL_UNKILLABLE)
return ERR_PTR(-EINVAL);
retval = security_task_create(clone_flags);
if (retval)
goto fork_out;
retval = -ENOMEM;
p = dup_task_struct(current);
if (!p)
goto fork_out;
ftrace_graph_init_task(p);
rt_mutex_init_task(p);
#ifdef CONFIG_PROVE_LOCKING
DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled);
DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
#endif
retval = -EAGAIN;
if (atomic_read(&p->real_cred->user->processes) >=
p->signal->rlim[RLIMIT_NPROC].rlim_cur) {
if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) &&
p->real_cred->user != INIT_USER)
goto bad_fork_free;
}
retval = copy_creds(p, clone_flags);
if (retval < 0)
goto bad_fork_free;
/*
* If multiple threads are within copy_process(), then this check
* triggers too late. This doesn't hurt, the check is only there
* to stop root fork bombs.
*/
retval = -EAGAIN;
if (nr_threads >= max_threads)
goto bad_fork_cleanup_count;
if (!try_module_get(task_thread_info(p)->exec_domain->module))
goto bad_fork_cleanup_count;
p->did_exec = 0;
delayacct_tsk_init(p); /* Must remain after dup_task_struct() */
copy_flags(clone_flags, p);
INIT_LIST_HEAD(&p->children);
INIT_LIST_HEAD(&p->sibling);
rcu_copy_process(p);
p->vfork_done = NULL;
spin_lock_init(&p->alloc_lock);
init_sigpending(&p->pending);
p->utime = cputime_zero;
p->stime = cputime_zero;
p->gtime = cputime_zero;
p->utimescaled = cputime_zero;
p->stimescaled = cputime_zero;
p->prev_utime = cputime_zero;
p->prev_stime = cputime_zero;
p->default_timer_slack_ns = current->timer_slack_ns;
task_io_accounting_init(&p->ioac);
acct_clear_integrals(p);
posix_cpu_timers_init(p);
p->lock_depth = -1; /* -1 = no lock */
do_posix_clock_monotonic_gettime(&p->start_time);
p->real_start_time = p->start_time;
monotonic_to_bootbased(&p->real_start_time);
p->io_context = NULL;
p->audit_context = NULL;
cgroup_fork(p);
#ifdef CONFIG_NUMA
p->mempolicy = mpol_dup(p->mempolicy);
if (IS_ERR(p->mempolicy)) {
retval = PTR_ERR(p->mempolicy);
p->mempolicy = NULL;
goto bad_fork_cleanup_cgroup;
}
mpol_fix_fork_child_flag(p);
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
p->irq_events = 0;
#ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW
p->hardirqs_enabled = 1;
#else
p->hardirqs_enabled = 0;
#endif
p->hardirq_enable_ip = 0;
p->hardirq_enable_event = 0;
p->hardirq_disable_ip = _THIS_IP_;
p->hardirq_disable_event = 0;
p->softirqs_enabled = 1;
p->softirq_enable_ip = _THIS_IP_;
p->softirq_enable_event = 0;
p->softirq_disable_ip = 0;
p->softirq_disable_event = 0;
p->hardirq_context = 0;
p->softirq_context = 0;
#endif
#ifdef CONFIG_LOCKDEP
p->lockdep_depth = 0; /* no locks held yet */
p->curr_chain_key = 0;
p->lockdep_recursion = 0;
#endif
#ifdef CONFIG_DEBUG_MUTEXES
p->blocked_on = NULL; /* not blocked yet */
#endif
p->bts = NULL;
p->stack_start = stack_start;
/* Perform scheduler related setup. Assign this task to a CPU. */
sched_fork(p, clone_flags);
retval = perf_event_init_task(p);
if (retval)
goto bad_fork_cleanup_policy;
if ((retval = audit_alloc(p)))
goto bad_fork_cleanup_policy;
/* copy all the process information */
if ((retval = copy_semundo(clone_flags, p)))
goto bad_fork_cleanup_audit;
if ((retval = copy_files(clone_flags, p)))
goto bad_fork_cleanup_semundo;
if ((retval = copy_fs(clone_flags, p)))
goto bad_fork_cleanup_files;
if ((retval = copy_sighand(clone_flags, p)))
goto bad_fork_cleanup_fs;
if ((retval = copy_signal(clone_flags, p)))
goto bad_fork_cleanup_sighand;
if ((retval = copy_mm(clone_flags, p)))
goto bad_fork_cleanup_signal;
if ((retval = copy_namespaces(clone_flags, p)))
goto bad_fork_cleanup_mm;
if ((retval = copy_io(clone_flags, p)))
goto bad_fork_cleanup_namespaces;
retval = copy_thread(clone_flags, stack_start, stack_size, p, regs);
if (retval)
goto bad_fork_cleanup_io;
if (pid != &init_struct_pid) {
retval = -ENOMEM;
pid = alloc_pid(p->nsproxy->pid_ns);
if (!pid)
goto bad_fork_cleanup_io;
if (clone_flags & CLONE_NEWPID) {
retval = pid_ns_prepare_proc(p->nsproxy->pid_ns);
if (retval < 0)
goto bad_fork_free_pid;
}
}
p->pid = pid_nr(pid);
p->tgid = p->pid;
if (clone_flags & CLONE_THREAD)
p->tgid = current->tgid;
if (current->nsproxy != p->nsproxy) {
retval = ns_cgroup_clone(p, pid);
if (retval)
goto bad_fork_free_pid;
}
p->set_child_tid = (clone_flags & CLONE_CHILD_SETTID) ? child_tidptr : NULL;
/*
* Clear TID on mm_release()?
*/
p->clear_child_tid = (clone_flags & CLONE_CHILD_CLEARTID) ? child_tidptr: NULL;
#ifdef CONFIG_FUTEX
p->robust_list = NULL;
#ifdef CONFIG_COMPAT
p->compat_robust_list = NULL;
#endif
INIT_LIST_HEAD(&p->pi_state_list);
p->pi_state_cache = NULL;
#endif
/*
* sigaltstack should be cleared when sharing the same VM
*/
if ((clone_flags & (CLONE_VM|CLONE_VFORK)) == CLONE_VM)
p->sas_ss_sp = p->sas_ss_size = 0;
/*
* Syscall tracing should be turned off in the child regardless
* of CLONE_PTRACE.
*/
clear_tsk_thread_flag(p, TIF_SYSCALL_TRACE);
#ifdef TIF_SYSCALL_EMU
clear_tsk_thread_flag(p, TIF_SYSCALL_EMU);
#endif
clear_all_latency_tracing(p);
/* ok, now we should be set up.. */
p->exit_signal = (clone_flags & CLONE_THREAD) ? -1 : (clone_flags & CSIGNAL);
p->pdeath_signal = 0;
p->exit_state = 0;
/*
* Ok, make it visible to the rest of the system.
* We dont wake it up yet.
*/
p->group_leader = p;
INIT_LIST_HEAD(&p->thread_group);
/* Now that the task is set up, run cgroup callbacks if
* necessary. We need to run them before the task is visible
* on the tasklist. */
cgroup_fork_callbacks(p);
cgroup_callbacks_done = 1;
/* Need tasklist lock for parent etc handling! */
write_lock_irq(&tasklist_lock);
/*
* The task hasn't been attached yet, so its cpus_allowed mask will
* not be changed, nor will its assigned CPU.
*
* The cpus_allowed mask of the parent may have changed after it was
* copied first time - so re-copy it here, then check the child's CPU
* to ensure it is on a valid CPU (and if not, just force it back to
* parent's CPU). This avoids alot of nasty races.
*/
p->cpus_allowed = current->cpus_allowed;
p->rt.nr_cpus_allowed = current->rt.nr_cpus_allowed;
if (unlikely(!cpu_isset(task_cpu(p), p->cpus_allowed) ||
!cpu_online(task_cpu(p))))
set_task_cpu(p, smp_processor_id());
/* CLONE_PARENT re-uses the old parent */
if (clone_flags & (CLONE_PARENT|CLONE_THREAD)) {
p->real_parent = current->real_parent;
p->parent_exec_id = current->parent_exec_id;
} else {
p->real_parent = current;
p->parent_exec_id = current->self_exec_id;
}
spin_lock(¤t->sighand->siglock);
/*
* Process group and session signals need to be delivered to just the
* parent before the fork or both the parent and the child after the
* fork. Restart if a signal comes in before we add the new process to
* it's process group.
* A fatal signal pending means that current will exit, so the new
* thread can't slip out of an OOM kill (or normal SIGKILL).
*/
recalc_sigpending();
if (signal_pending(current)) {
spin_unlock(¤t->sighand->siglock);
write_unlock_irq(&tasklist_lock);
retval = -ERESTARTNOINTR;
goto bad_fork_free_pid;
}
if (clone_flags & CLONE_THREAD) {
atomic_inc(¤t->signal->count);
atomic_inc(¤t->signal->live);
p->group_leader = current->group_leader;
list_add_tail_rcu(&p->thread_group, &p->group_leader->thread_group);
}
if (likely(p->pid)) {
list_add_tail(&p->sibling, &p->real_parent->children);
tracehook_finish_clone(p, clone_flags, trace);
if (thread_group_leader(p)) {
if (clone_flags & CLONE_NEWPID)
p->nsproxy->pid_ns->child_reaper = p;
p->signal->leader_pid = pid;
tty_kref_put(p->signal->tty);
p->signal->tty = tty_kref_get(current->signal->tty);
attach_pid(p, PIDTYPE_PGID, task_pgrp(current));
attach_pid(p, PIDTYPE_SID, task_session(current));
list_add_tail_rcu(&p->tasks, &init_task.tasks);
__get_cpu_var(process_counts)++;
}
attach_pid(p, PIDTYPE_PID, pid);
nr_threads++;
}
total_forks++;
spin_unlock(¤t->sighand->siglock);
write_unlock_irq(&tasklist_lock);
proc_fork_connector(p);
cgroup_post_fork(p);
perf_event_fork(p);
return p;
bad_fork_free_pid:
if (pid != &init_struct_pid)
free_pid(pid);
bad_fork_cleanup_io:
put_io_context(p->io_context);
bad_fork_cleanup_namespaces:
exit_task_namespaces(p);
bad_fork_cleanup_mm:
if (p->mm)
mmput(p->mm);
bad_fork_cleanup_signal:
if (!(clone_flags & CLONE_THREAD))
__cleanup_signal(p->signal);
bad_fork_cleanup_sighand:
__cleanup_sighand(p->sighand);
bad_fork_cleanup_fs:
exit_fs(p); /* blocking */
bad_fork_cleanup_files:
exit_files(p); /* blocking */
bad_fork_cleanup_semundo:
exit_sem(p);
bad_fork_cleanup_audit:
audit_free(p);
bad_fork_cleanup_policy:
perf_event_free_task(p);
#ifdef CONFIG_NUMA
mpol_put(p->mempolicy);
bad_fork_cleanup_cgroup:
#endif
cgroup_exit(p, cgroup_callbacks_done);
delayacct_tsk_free(p);
module_put(task_thread_info(p)->exec_domain->module);
bad_fork_cleanup_count:
atomic_dec(&p->cred->user->processes);
exit_creds(p);
bad_fork_free:
free_task(p);
fork_out:
return ERR_PTR(retval);
}
static void symbol_int_callback(struct urb *urb)
{
struct symbol_private *priv = urb->context;
unsigned char *data = urb->transfer_buffer;
struct usb_serial_port *port = priv->port;
int status = urb->status;
struct tty_struct *tty;
int result;
int data_length;
dbg("%s - port %d", __func__, port->number);
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d",
__func__, status);
return;
default:
dbg("%s - nonzero urb status received: %d",
__func__, status);
goto exit;
}
usb_serial_debug_data(debug, &port->dev, __func__, urb->actual_length,
data);
if (urb->actual_length > 1) {
data_length = urb->actual_length - 1;
/*
* Data from the device comes with a 1 byte header:
*
* <size of data>data...
* This is real data to be sent to the tty layer
* we pretty much just ignore the size and send everything
* else to the tty layer.
*/
tty = tty_port_tty_get(&port->port);
if (tty) {
tty_insert_flip_string(tty, &data[1], data_length);
tty_flip_buffer_push(tty);
tty_kref_put(tty);
}
} else {
dev_dbg(&priv->udev->dev,
"Improper amount of data received from the device, "
"%d bytes", urb->actual_length);
}
exit:
spin_lock(&priv->lock);
/* Continue trying to always read if we should */
if (!priv->throttled) {
usb_fill_int_urb(priv->int_urb, priv->udev,
usb_rcvintpipe(priv->udev,
priv->int_address),
priv->int_buffer, priv->buffer_size,
symbol_int_callback, priv, priv->bInterval);
result = usb_submit_urb(priv->int_urb, GFP_ATOMIC);
if (result)
dev_err(&port->dev,
"%s - failed resubmitting read urb, error %d\n",
__func__, result);
} else
priv->actually_throttled = true;
spin_unlock(&priv->lock);
}
static void isicom_tx(unsigned long _data)
{
unsigned long flags, base;
unsigned int retries;
short count = (BOARD_COUNT-1), card;
short txcount, wrd, residue, word_count, cnt;
struct isi_port *port;
struct tty_struct *tty;
/* find next active board */
card = (prev_card + 1) & 0x0003;
while (count-- > 0) {
if (isi_card[card].status & BOARD_ACTIVE)
break;
card = (card + 1) & 0x0003;
}
if (!(isi_card[card].status & BOARD_ACTIVE))
goto sched_again;
prev_card = card;
count = isi_card[card].port_count;
port = isi_card[card].ports;
base = isi_card[card].base;
spin_lock_irqsave(&isi_card[card].card_lock, flags);
for (retries = 0; retries < 100; retries++) {
if (inw(base + 0xe) & 0x1)
break;
udelay(2);
}
if (retries >= 100)
goto unlock;
tty = tty_port_tty_get(&port->port);
if (tty == NULL)
goto put_unlock;
for (; count > 0; count--, port++) {
/* port not active or tx disabled to force flow control */
if (!(port->port.flags & ASYNC_INITIALIZED) ||
!(port->status & ISI_TXOK))
continue;
txcount = min_t(short, TX_SIZE, port->xmit_cnt);
if (txcount <= 0 || tty->stopped || tty->hw_stopped)
continue;
if (!(inw(base + 0x02) & (1 << port->channel)))
continue;
pr_debug("txing %d bytes, port%d.\n",
txcount, port->channel + 1);
outw((port->channel << isi_card[card].shift_count) | txcount,
base);
residue = NO;
wrd = 0;
while (1) {
cnt = min_t(int, txcount, (SERIAL_XMIT_SIZE
- port->xmit_tail));
if (residue == YES) {
residue = NO;
if (cnt > 0) {
wrd |= (port->port.xmit_buf[port->xmit_tail]
<< 8);
port->xmit_tail = (port->xmit_tail + 1)
& (SERIAL_XMIT_SIZE - 1);
port->xmit_cnt--;
txcount--;
cnt--;
outw(wrd, base);
} else {
outw(wrd, base);
break;
}
}
if (cnt <= 0)
break;
word_count = cnt >> 1;
outsw(base, port->port.xmit_buf+port->xmit_tail, word_count);
port->xmit_tail = (port->xmit_tail
+ (word_count << 1)) & (SERIAL_XMIT_SIZE - 1);
txcount -= (word_count << 1);
port->xmit_cnt -= (word_count << 1);
if (cnt & 0x0001) {
residue = YES;
wrd = port->port.xmit_buf[port->xmit_tail];
port->xmit_tail = (port->xmit_tail + 1)
& (SERIAL_XMIT_SIZE - 1);
port->xmit_cnt--;
txcount--;
}
}
InterruptTheCard(base);
if (port->xmit_cnt <= 0)
port->status &= ~ISI_TXOK;
if (port->xmit_cnt <= WAKEUP_CHARS)
tty_wakeup(tty);
}
put_unlock:
tty_kref_put(tty);
unlock:
spin_unlock_irqrestore(&isi_card[card].card_lock, flags);
/* schedule another tx for hopefully in about 10ms */
sched_again:
mod_timer(&tx, jiffies + msecs_to_jiffies(10));
}
/* control interface reports status changes with "interrupt" transfers */
static void acm_ctrl_irq(struct urb *urb)
{
struct acm *acm = urb->context;
struct usb_cdc_notification *dr = urb->transfer_buffer;
struct tty_struct *tty;
unsigned char *data;
int newctrl;
int retval;
int status = urb->status;
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d", __func__, status);
return;
default:
dbg("%s - nonzero urb status received: %d", __func__, status);
goto exit;
}
if (!ACM_READY(acm))
goto exit;
data = (unsigned char *)(dr + 1);
switch (dr->bNotificationType) {
case USB_CDC_NOTIFY_NETWORK_CONNECTION:
dbg("%s network", dr->wValue ?
"connected to" : "disconnected from");
break;
case USB_CDC_NOTIFY_SERIAL_STATE:
tty = tty_port_tty_get(&acm->port);
newctrl = get_unaligned_le16(data);
if (tty) {
if (!acm->clocal &&
(acm->ctrlin & ~newctrl & ACM_CTRL_DCD)) {
dbg("calling hangup");
tty_hangup(tty);
}
tty_kref_put(tty);
}
acm->ctrlin = newctrl;
dbg("input control lines: dcd%c dsr%c break%c ring%c framing%c parity%c overrun%c",
acm->ctrlin & ACM_CTRL_DCD ? '+' : '-',
acm->ctrlin & ACM_CTRL_DSR ? '+' : '-',
acm->ctrlin & ACM_CTRL_BRK ? '+' : '-',
acm->ctrlin & ACM_CTRL_RI ? '+' : '-',
acm->ctrlin & ACM_CTRL_FRAMING ? '+' : '-',
acm->ctrlin & ACM_CTRL_PARITY ? '+' : '-',
acm->ctrlin & ACM_CTRL_OVERRUN ? '+' : '-');
break;
default:
dbg("unknown notification %d received: index %d len %d data0 %d data1 %d",
dr->bNotificationType, dr->wIndex,
dr->wLength, data[0], data[1]);
break;
}
exit:
usb_mark_last_busy(acm->dev);
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval)
dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with "
"result %d", __func__, retval);
}
static void acm_rx_tasklet(unsigned long _acm)
{
struct acm *acm = (void *)_acm;
struct acm_rb *buf;
struct tty_struct *tty;
struct acm_ru *rcv;
unsigned long flags;
unsigned char throttled;
dbg("Entering acm_rx_tasklet");
if (!ACM_READY(acm)) {
dbg("acm_rx_tasklet: ACM not ready");
return;
}
spin_lock_irqsave(&acm->throttle_lock, flags);
throttled = acm->throttle;
spin_unlock_irqrestore(&acm->throttle_lock, flags);
if (throttled) {
dbg("acm_rx_tasklet: throttled");
return;
}
tty = tty_port_tty_get(&acm->port);
next_buffer:
spin_lock_irqsave(&acm->read_lock, flags);
if (list_empty(&acm->filled_read_bufs)) {
spin_unlock_irqrestore(&acm->read_lock, flags);
goto urbs;
}
buf = list_entry(acm->filled_read_bufs.next,
struct acm_rb, list);
list_del(&buf->list);
spin_unlock_irqrestore(&acm->read_lock, flags);
dbg("acm_rx_tasklet: procesing buf 0x%p, size = %d", buf, buf->size);
if (tty) {
spin_lock_irqsave(&acm->throttle_lock, flags);
throttled = acm->throttle;
spin_unlock_irqrestore(&acm->throttle_lock, flags);
if (!throttled) {
tty_buffer_request_room(tty, buf->size);
tty_insert_flip_string(tty, buf->base, buf->size);
tty_flip_buffer_push(tty);
} else {
tty_kref_put(tty);
dbg("Throttling noticed");
spin_lock_irqsave(&acm->read_lock, flags);
list_add(&buf->list, &acm->filled_read_bufs);
spin_unlock_irqrestore(&acm->read_lock, flags);
return;
}
}
spin_lock_irqsave(&acm->read_lock, flags);
list_add(&buf->list, &acm->spare_read_bufs);
spin_unlock_irqrestore(&acm->read_lock, flags);
goto next_buffer;
urbs:
tty_kref_put(tty);
while (!list_empty(&acm->spare_read_bufs)) {
spin_lock_irqsave(&acm->read_lock, flags);
if (list_empty(&acm->spare_read_urbs)) {
acm->processing = 0;
spin_unlock_irqrestore(&acm->read_lock, flags);
return;
}
rcv = list_entry(acm->spare_read_urbs.next,
struct acm_ru, list);
list_del(&rcv->list);
spin_unlock_irqrestore(&acm->read_lock, flags);
buf = list_entry(acm->spare_read_bufs.next,
struct acm_rb, list);
list_del(&buf->list);
rcv->buffer = buf;
if (acm->is_int_ep)
usb_fill_int_urb(rcv->urb, acm->dev,
acm->rx_endpoint,
buf->base,
acm->readsize,
acm_read_bulk, rcv, acm->bInterval);
else
usb_fill_bulk_urb(rcv->urb, acm->dev,
acm->rx_endpoint,
buf->base,
acm->readsize,
acm_read_bulk, rcv);
rcv->urb->transfer_dma = buf->dma;
rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
/* This shouldn't kill the driver as unsuccessful URBs are
returned to the free-urbs-pool and resubmited ASAP */
spin_lock_irqsave(&acm->read_lock, flags);
if (acm->susp_count ||
usb_submit_urb(rcv->urb, GFP_ATOMIC) < 0) {
list_add(&buf->list, &acm->spare_read_bufs);
list_add(&rcv->list, &acm->spare_read_urbs);
acm->processing = 0;
spin_unlock_irqrestore(&acm->read_lock, flags);
return;
} else {
spin_unlock_irqrestore(&acm->read_lock, flags);
dbg("acm_rx_tasklet: sending urb 0x%p, rcv 0x%p, buf 0x%p", rcv->urb, rcv, buf);
}
}
spin_lock_irqsave(&acm->read_lock, flags);
acm->processing = 0;
spin_unlock_irqrestore(&acm->read_lock, flags);
}
void __cleanup_signal(struct signal_struct *sig)
{
thread_group_cputime_free(sig);
tty_kref_put(sig->tty);
kmem_cache_free(signal_cachep, sig);
}
static void opticon_read_bulk_callback(struct urb *urb)
{
struct opticon_private *priv = urb->context;
unsigned char *data = urb->transfer_buffer;
struct usb_serial_port *port = priv->port;
int status = urb->status;
struct tty_struct *tty;
int result;
int data_length;
unsigned long flags;
dbg("%s - port %d", __func__, port->number);
switch (status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d",
__func__, status);
return;
default:
dbg("%s - nonzero urb status received: %d",
__func__, status);
goto exit;
}
usb_serial_debug_data(debug, &port->dev, __func__, urb->actual_length,
data);
if (urb->actual_length > 2) {
data_length = urb->actual_length - 2;
/*
* Data from the device comes with a 2 byte header:
*
* <0x00><0x00>data...
* This is real data to be sent to the tty layer
* <0x00><0x01)level
* This is a CTS level change, the third byte is the CTS
* value (0 for low, 1 for high).
*/
if ((data[0] == 0x00) && (data[1] == 0x00)) {
/* real data, send it to the tty layer */
tty = tty_port_tty_get(&port->port);
if (tty) {
tty_insert_flip_string(tty, data + 2,
data_length);
tty_flip_buffer_push(tty);
tty_kref_put(tty);
}
} else {
if ((data[0] == 0x00) && (data[1] == 0x01)) {
spin_lock_irqsave(&priv->lock, flags);
/* CTS status information package */
if (data[2] == 0x00)
priv->cts = false;
else
priv->cts = true;
spin_unlock_irqrestore(&priv->lock, flags);
} else {
dev_dbg(&priv->udev->dev,
"Unknown data packet received from the device:"
" %2x %2x\n",
data[0], data[1]);
}
}
} else {
dev_dbg(&priv->udev->dev,
"Improper amount of data received from the device, "
"%d bytes", urb->actual_length);
}
exit:
spin_lock(&priv->lock);
/* Continue trying to always read if we should */
if (!priv->throttled) {
usb_fill_bulk_urb(priv->bulk_read_urb, priv->udev,
usb_rcvbulkpipe(priv->udev,
priv->bulk_address),
priv->bulk_in_buffer, priv->buffer_size,
opticon_read_bulk_callback, priv);
result = usb_submit_urb(priv->bulk_read_urb, GFP_ATOMIC);
if (result)
dev_err(&port->dev,
"%s - failed resubmitting read urb, error %d\n",
__func__, result);
} else
priv->actually_throttled = true;
spin_unlock(&priv->lock);
}
/* bulk read call back function. check the status of the urb. if transfer
* failed return. then update the status and the tty send data to tty subsys.
* submit urb again.
*/
static void spcp8x5_read_bulk_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct spcp8x5_private *priv = usb_get_serial_port_data(port);
struct tty_struct *tty;
unsigned char *data = urb->transfer_buffer;
unsigned long flags;
int i;
int result = urb->status;
u8 status;
char tty_flag;
dev_dbg(&port->dev, "start, result = %d, urb->actual_length = %d\n,",
result, urb->actual_length);
/* check the urb status */
if (result) {
if (!port->port.count)
return;
if (result == -EPROTO) {
/* spcp8x5 mysteriously fails with -EPROTO */
/* reschedule the read */
urb->dev = port->serial->dev;
result = usb_submit_urb(urb , GFP_ATOMIC);
if (result)
dev_dbg(&port->dev,
"failed submitting read urb %d\n",
result);
return;
}
dev_dbg(&port->dev, "unable to handle the error, exiting.\n");
return;
}
/* get tty_flag from status */
tty_flag = TTY_NORMAL;
spin_lock_irqsave(&priv->lock, flags);
status = priv->line_status;
priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
spin_unlock_irqrestore(&priv->lock, flags);
/* wake up the wait for termios */
wake_up_interruptible(&priv->delta_msr_wait);
/* break takes precedence over parity, which takes precedence over
* framing errors */
if (status & UART_BREAK_ERROR)
tty_flag = TTY_BREAK;
else if (status & UART_PARITY_ERROR)
tty_flag = TTY_PARITY;
else if (status & UART_FRAME_ERROR)
tty_flag = TTY_FRAME;
dev_dbg(&port->dev, "tty_flag = %d\n", tty_flag);
tty = tty_port_tty_get(&port->port);
if (tty && urb->actual_length) {
tty_buffer_request_room(tty, urb->actual_length + 1);
/* overrun is special, not associated with a char */
if (status & UART_OVERRUN_ERROR)
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
for (i = 0; i < urb->actual_length; ++i)
tty_insert_flip_char(tty, data[i], tty_flag);
tty_flip_buffer_push(tty);
}
if (status & UART_DCD)
usb_serial_handle_dcd_change(port, tty,
priv->line_status & MSR_STATUS_LINE_DCD);
tty_kref_put(tty);
/* Schedule the next read _if_ we are still open */
if (port->port.count) {
urb->dev = port->serial->dev;
result = usb_submit_urb(urb , GFP_ATOMIC);
if (result)
dev_dbg(&port->dev, "failed submitting read urb %d\n",
result);
}
return;
}
static void smd_tty_notify(void *priv, unsigned event)
{
struct smd_tty_info *info = priv;
struct tty_struct *tty;
unsigned long flags;
switch (event) {
case SMD_EVENT_DATA:
spin_lock_irqsave(&info->reset_lock_lha2, flags);
if (!info->is_open) {
spin_unlock_irqrestore(&info->reset_lock_lha2, flags);
break;
}
spin_unlock_irqrestore(&info->reset_lock_lha2, flags);
/* There may be clients (tty framework) that are blocked
* waiting for space to write data, so if a possible read
* interrupt came in wake anyone waiting and disable the
* interrupts
*/
if (smd_write_avail(info->ch)) {
smd_disable_read_intr(info->ch);
tty = tty_port_tty_get(&info->port);
if (tty)
wake_up_interruptible(&tty->write_wait);
tty_kref_put(tty);
}
spin_lock_irqsave(&info->ra_lock_lha3, flags);
if (smd_read_avail(info->ch)) {
__pm_stay_awake(&info->ra_wakeup_source);
tasklet_hi_schedule(&info->tty_tsklt);
}
spin_unlock_irqrestore(&info->ra_lock_lha3, flags);
break;
case SMD_EVENT_OPEN:
tty = tty_port_tty_get(&info->port);
spin_lock_irqsave(&info->reset_lock_lha2, flags);
if (tty)
clear_bit(TTY_OTHER_CLOSED, &tty->flags);
info->in_reset = 0;
info->in_reset_updated = 1;
info->is_open = 1;
wake_up_interruptible(&info->ch_opened_wait_queue);
spin_unlock_irqrestore(&info->reset_lock_lha2, flags);
tty_kref_put(tty);
break;
case SMD_EVENT_CLOSE:
spin_lock_irqsave(&info->reset_lock_lha2, flags);
info->in_reset = 1;
info->in_reset_updated = 1;
info->is_open = 0;
wake_up_interruptible(&info->ch_opened_wait_queue);
spin_unlock_irqrestore(&info->reset_lock_lha2, flags);
tty = tty_port_tty_get(&info->port);
if (tty) {
/* send TTY_BREAK through read tasklet */
set_bit(TTY_OTHER_CLOSED, &tty->flags);
tasklet_hi_schedule(&info->tty_tsklt);
if (tty->index == LOOPBACK_IDX)
schedule_delayed_work(&loopback_work,
msecs_to_jiffies(1000));
}
tty_kref_put(tty);
break;
#ifdef CONFIG_LGE_USES_SMD_DS_TTY
/*
*/
case SMD_EVENT_REOPEN_READY:
/* smd channel is closed completely */
spin_lock_irqsave(&info->reset_lock_lha2, flags);
info->in_reset = 1;
info->in_reset_updated = 1;
info->is_open = 0;
wake_up_interruptible(&info->ch_opened_wait_queue);
spin_unlock_irqrestore(&info->reset_lock_lha2, flags);
break;
#endif
}
}
static void smd_tty_read(unsigned long param)
{
unsigned char *ptr;
int avail;
struct smd_tty_info *info = (struct smd_tty_info *)param;
struct tty_struct *tty = tty_port_tty_get(&info->port);
unsigned long flags;
if (!tty)
return;
for (;;) {
if (is_in_reset(info)) {
/* signal TTY clients using TTY_BREAK */
tty_insert_flip_char(tty, 0x00, TTY_BREAK);
tty_flip_buffer_push(tty);
break;
}
if (test_bit(TTY_THROTTLED, &tty->flags)) break;
spin_lock_irqsave(&info->ra_lock_lha3, flags);
avail = smd_read_avail(info->ch);
if (avail == 0) {
__pm_relax(&info->ra_wakeup_source);
spin_unlock_irqrestore(&info->ra_lock_lha3, flags);
break;
}
spin_unlock_irqrestore(&info->ra_lock_lha3, flags);
if (avail > MAX_TTY_BUF_SIZE)
avail = MAX_TTY_BUF_SIZE;
avail = tty_prepare_flip_string(tty, &ptr, avail);
if (avail <= 0) {
mod_timer(&info->buf_req_timer,
jiffies + msecs_to_jiffies(30));
tty_kref_put(tty);
return;
}
if (smd_read(info->ch, ptr, avail) != avail) {
/* shouldn't be possible since we're in interrupt
** context here and nobody else could 'steal' our
** characters.
*/
SMD_TTY_ERR(
"%s - Possible smd_tty_buffer mismatch for %s",
__func__, info->ch->name);
}
/*
* Keep system awake long enough to allow the TTY
* framework to pass the flip buffer to any waiting
* userspace clients.
*/
__pm_wakeup_event(&info->pending_ws, TTY_PUSH_WS_DELAY);
tty_flip_buffer_push(tty);
}
/* XXX only when writable and necessary */
tty_wakeup(tty);
tty_kref_put(tty);
}
