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USB: ark3116: Callbacks for interrupt and bulk read
Signed-off-by: Bart Hartgers <bart.hartgers@gmail.com> Cc: Mike McCormack <mikem@ring3k.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
bart.hartgers@gmail.com
Greg Kroah-Hartman
parent
546b742968
commit
62d826c8dd
1 changed files with 194 additions and 0 deletions
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@ -605,6 +605,198 @@ static void ark3116_break_ctl(struct tty_struct *tty, int break_state)
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mutex_unlock(&priv->hw_lock);
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}
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static void ark3116_update_msr(struct usb_serial_port *port, __u8 msr)
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{
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struct ark3116_private *priv = usb_get_serial_port_data(port);
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unsigned long flags;
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spin_lock_irqsave(&priv->status_lock, flags);
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priv->msr = msr;
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spin_unlock_irqrestore(&priv->status_lock, flags);
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if (msr & UART_MSR_ANY_DELTA) {
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/* update input line counters */
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if (msr & UART_MSR_DCTS)
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priv->icount.cts++;
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if (msr & UART_MSR_DDSR)
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priv->icount.dsr++;
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if (msr & UART_MSR_DDCD)
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priv->icount.dcd++;
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if (msr & UART_MSR_TERI)
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priv->icount.rng++;
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wake_up_interruptible(&priv->delta_msr_wait);
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}
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}
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static void ark3116_update_lsr(struct usb_serial_port *port, __u8 lsr)
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{
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struct ark3116_private *priv = usb_get_serial_port_data(port);
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unsigned long flags;
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spin_lock_irqsave(&priv->status_lock, flags);
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/* combine bits */
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priv->lsr |= lsr;
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spin_unlock_irqrestore(&priv->status_lock, flags);
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if (lsr&UART_LSR_BRK_ERROR_BITS) {
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if (lsr & UART_LSR_BI)
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priv->icount.brk++;
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if (lsr & UART_LSR_FE)
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priv->icount.frame++;
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if (lsr & UART_LSR_PE)
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priv->icount.parity++;
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if (lsr & UART_LSR_OE)
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priv->icount.overrun++;
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}
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}
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static void ark3116_read_int_callback(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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int status = urb->status;
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const __u8 *data = urb->transfer_buffer;
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int result;
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switch (status) {
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* this urb is terminated, clean up */
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dbg("%s - urb shutting down with status: %d",
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__func__, status);
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return;
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default:
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dbg("%s - nonzero urb status received: %d",
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__func__, status);
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break;
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case 0: /* success */
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/* discovered this by trail and error... */
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if ((urb->actual_length == 4) && (data[0] == 0xe8)) {
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const __u8 id = data[1]&UART_IIR_ID;
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dbg("%s: iir=%02x", __func__, data[1]);
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if (id == UART_IIR_MSI) {
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dbg("%s: msr=%02x", __func__, data[3]);
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ark3116_update_msr(port, data[3]);
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break;
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} else if (id == UART_IIR_RLSI) {
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dbg("%s: lsr=%02x", __func__, data[2]);
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ark3116_update_lsr(port, data[2]);
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break;
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}
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}
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/*
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* Not sure what this data meant...
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*/
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usb_serial_debug_data(debug, &port->dev,
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__func__,
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urb->actual_length,
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urb->transfer_buffer);
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break;
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}
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result = usb_submit_urb(urb, GFP_ATOMIC);
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if (result)
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dev_err(&urb->dev->dev,
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"%s - Error %d submitting interrupt urb\n",
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__func__, result);
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}
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/* Data comes in via the bulk (data) URB, erors/interrupts via the int URB.
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* This means that we cannot be sure which data byte has an associated error
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* condition, so we report an error for all data in the next bulk read.
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*
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* Actually, there might even be a window between the bulk data leaving the
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* ark and reading/resetting the lsr in the read_bulk_callback where an
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* interrupt for the next data block could come in.
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* Without somekind of ordering on the ark, we would have to report the
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* error for the next block of data as well...
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* For now, let's pretend this can't happen.
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*/
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static void send_to_tty(struct tty_struct *tty,
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const unsigned char *chars,
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size_t size, char flag)
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{
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if (size == 0)
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return;
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if (flag == TTY_NORMAL) {
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tty_insert_flip_string(tty, chars, size);
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} else {
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int i;
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for (i = 0; i < size; ++i)
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tty_insert_flip_char(tty, chars[i], flag);
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}
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}
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static void ark3116_read_bulk_callback(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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struct ark3116_private *priv = usb_get_serial_port_data(port);
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const __u8 *data = urb->transfer_buffer;
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int status = urb->status;
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struct tty_struct *tty;
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unsigned long flags;
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int result;
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char flag;
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__u32 lsr;
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switch (status) {
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* this urb is terminated, clean up */
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dbg("%s - urb shutting down with status: %d",
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__func__, status);
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return;
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default:
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dbg("%s - nonzero urb status received: %d",
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__func__, status);
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break;
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case 0: /* success */
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spin_lock_irqsave(&priv->status_lock, flags);
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lsr = priv->lsr;
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/* clear error bits */
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priv->lsr &= ~UART_LSR_BRK_ERROR_BITS;
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spin_unlock_irqrestore(&priv->status_lock, flags);
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if (unlikely(lsr & UART_LSR_BI))
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flag = TTY_BREAK;
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else if (unlikely(lsr & UART_LSR_PE))
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flag = TTY_PARITY;
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else if (unlikely(lsr & UART_LSR_FE))
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flag = TTY_FRAME;
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else
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flag = TTY_NORMAL;
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tty = tty_port_tty_get(&port->port);
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if (tty) {
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tty_buffer_request_room(tty, urb->actual_length + 1);
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/* overrun is special, not associated with a char */
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if (unlikely(lsr & UART_LSR_OE))
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tty_insert_flip_char(tty, 0, TTY_OVERRUN);
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send_to_tty(tty, data, urb->actual_length, flag);
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tty_flip_buffer_push(tty);
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tty_kref_put(tty);
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}
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/* Throttle the device if requested by tty */
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spin_lock_irqsave(&port->lock, flags);
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port->throttled = port->throttle_req;
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if (port->throttled) {
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spin_unlock_irqrestore(&port->lock, flags);
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return;
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} else
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spin_unlock_irqrestore(&port->lock, flags);
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}
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/* Continue reading from device */
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result = usb_submit_urb(urb, GFP_ATOMIC);
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if (result)
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dev_err(&urb->dev->dev, "%s - failed resubmitting"
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" read urb, error %d\n", __func__, result);
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}
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static struct usb_driver ark3116_driver = {
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.name = "ark3116",
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.probe = usb_serial_probe,
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@ -631,6 +823,8 @@ static struct usb_serial_driver ark3116_device = {
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.open = ark3116_open,
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.close = ark3116_close,
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.break_ctl = ark3116_break_ctl,
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.read_int_callback = ark3116_read_int_callback,
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.read_bulk_callback = ark3116_read_bulk_callback,
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};
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static int __init ark3116_init(void)
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