#define N_IN_URB 4
#define N_OUT_URB 4
#define IN_BUFLEN 4096
-#define OUT_BUFLEN 128
struct sierra_port_private {
+ spinlock_t lock; /* lock the structure */
+ int outstanding_urbs; /* number of out urbs in flight */
+
/* Input endpoints and buffer for this port */
struct urb *in_urbs[N_IN_URB];
char in_buffer[N_IN_URB][IN_BUFLEN];
- /* Output endpoints and buffer for this port */
- struct urb *out_urbs[N_OUT_URB];
- char out_buffer[N_OUT_URB][OUT_BUFLEN];
/* Settings for the port */
int rts_state; /* Handshaking pins (outputs) */
int dsr_state;
int dcd_state;
int ri_state;
-
- unsigned long tx_start_time[N_OUT_URB];
};
static int sierra_send_setup(struct usb_serial_port *port)
return -ENOIOCTLCMD;
}
+static void sierra_outdat_callback(struct urb *urb)
+{
+ struct usb_serial_port *port = urb->context;
+ struct sierra_port_private *portdata = usb_get_serial_port_data(port);
+ int status = urb->status;
+ unsigned long flags;
+
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ /* free up the transfer buffer, as usb_free_urb() does not do this */
+ kfree(urb->transfer_buffer);
+
+ if (status)
+ dbg("%s - nonzero write bulk status received: %d",
+ __FUNCTION__, status);
+
+ spin_lock_irqsave(&portdata->lock, flags);
+ --portdata->outstanding_urbs;
+ spin_unlock_irqrestore(&portdata->lock, flags);
+
+ usb_serial_port_softint(port);
+}
+
/* Write */
static int sierra_write(struct usb_serial_port *port,
const unsigned char *buf, int count)
{
- struct sierra_port_private *portdata;
- int i;
- int left, todo;
- struct urb *this_urb = NULL; /* spurious */
- int err;
+ struct sierra_port_private *portdata = usb_get_serial_port_data(port);
+ struct usb_serial *serial = port->serial;
+ unsigned long flags;
+ unsigned char *buffer;
+ struct urb *urb;
+ int status;
portdata = usb_get_serial_port_data(port);
dbg("%s: write (%d chars)", __FUNCTION__, count);
- i = 0;
- left = count;
- for (i=0; left > 0 && i < N_OUT_URB; i++) {
- todo = left;
- if (todo > OUT_BUFLEN)
- todo = OUT_BUFLEN;
-
- this_urb = portdata->out_urbs[i];
- if (this_urb->status == -EINPROGRESS) {
- if (time_before(jiffies,
- portdata->tx_start_time[i] + 10 * HZ))
- continue;
- usb_unlink_urb(this_urb);
- continue;
- }
- if (this_urb->status != 0)
- dbg("usb_write %p failed (err=%d)",
- this_urb, this_urb->status);
+ spin_lock_irqsave(&portdata->lock, flags);
+ if (portdata->outstanding_urbs > N_OUT_URB) {
+ spin_unlock_irqrestore(&portdata->lock, flags);
+ dbg("%s - write limit hit\n", __FUNCTION__);
+ return 0;
+ }
+ portdata->outstanding_urbs++;
+ spin_unlock_irqrestore(&portdata->lock, flags);
+
+ buffer = kmalloc(count, GFP_ATOMIC);
+ if (!buffer) {
+ dev_err(&port->dev, "out of memory\n");
+ count = -ENOMEM;
+ goto error_no_buffer;
+ }
- dbg("%s: endpoint %d buf %d", __FUNCTION__,
- usb_pipeendpoint(this_urb->pipe), i);
+ urb = usb_alloc_urb(0, GFP_ATOMIC);
+ if (!urb) {
+ dev_err(&port->dev, "no more free urbs\n");
+ count = -ENOMEM;
+ goto error_no_urb;
+ }
- /* send the data */
- memcpy (this_urb->transfer_buffer, buf, todo);
- this_urb->transfer_buffer_length = todo;
+ memcpy(buffer, buf, count);
- this_urb->dev = port->serial->dev;
- err = usb_submit_urb(this_urb, GFP_ATOMIC);
- if (err) {
- dbg("usb_submit_urb %p (write bulk) failed "
- "(%d, has %d)", this_urb,
- err, this_urb->status);
- continue;
- }
- portdata->tx_start_time[i] = jiffies;
- buf += todo;
- left -= todo;
+ usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, buffer);
+
+ usb_fill_bulk_urb(urb, serial->dev,
+ usb_sndbulkpipe(serial->dev,
+ port->bulk_out_endpointAddress),
+ buffer, count, sierra_outdat_callback, port);
+
+ /* send it down the pipe */
+ status = usb_submit_urb(urb, GFP_ATOMIC);
+ if (status) {
+ dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
+ "with status = %d\n", __FUNCTION__, status);
+ count = status;
+ goto error;
}
- count -= left;
- dbg("%s: wrote (did %d)", __FUNCTION__, count);
+ /* we are done with this urb, so let the host driver
+ * really free it when it is finished with it */
+ usb_free_urb(urb);
+
+ return count;
+error:
+ usb_free_urb(urb);
+error_no_urb:
+ kfree(buffer);
+error_no_buffer:
+ spin_lock_irqsave(&portdata->lock, flags);
+ --portdata->outstanding_urbs;
+ spin_unlock_irqrestore(&portdata->lock, flags);
return count;
}
if (port->open_count && status != -ESHUTDOWN) {
err = usb_submit_urb(urb, GFP_ATOMIC);
if (err)
- printk(KERN_ERR "%s: resubmit read urb failed. "
- "(%d)", __FUNCTION__, err);
+ dev_err(&port->dev, "resubmit read urb failed."
+ "(%d)", err);
}
}
return;
}
-static void sierra_outdat_callback(struct urb *urb)
-{
- struct usb_serial_port *port;
-
- dbg("%s", __FUNCTION__);
-
- port = (struct usb_serial_port *) urb->context;
-
- usb_serial_port_softint(port);
-}
-
static void sierra_instat_callback(struct urb *urb)
{
int err;
static int sierra_write_room(struct usb_serial_port *port)
{
- struct sierra_port_private *portdata;
- int i;
- int data_len = 0;
- struct urb *this_urb;
+ struct sierra_port_private *portdata = usb_get_serial_port_data(port);
+ unsigned long flags;
- portdata = usb_get_serial_port_data(port);
+ dbg("%s - port %d", __FUNCTION__, port->number);
- for (i=0; i < N_OUT_URB; i++) {
- this_urb = portdata->out_urbs[i];
- if (this_urb && this_urb->status != -EINPROGRESS)
- data_len += OUT_BUFLEN;
+ /* try to give a good number back based on if we have any free urbs at
+ * this point in time */
+ spin_lock_irqsave(&portdata->lock, flags);
+ if (portdata->outstanding_urbs > N_OUT_URB * 2 / 3) {
+ spin_unlock_irqrestore(&portdata->lock, flags);
+ dbg("%s - write limit hit\n", __FUNCTION__);
+ return 0;
}
+ spin_unlock_irqrestore(&portdata->lock, flags);
- dbg("%s: %d", __FUNCTION__, data_len);
- return data_len;
+ return 2048;
}
static int sierra_chars_in_buffer(struct usb_serial_port *port)
{
- struct sierra_port_private *portdata;
- int i;
- int data_len = 0;
- struct urb *this_urb;
-
- portdata = usb_get_serial_port_data(port);
-
- for (i=0; i < N_OUT_URB; i++) {
- this_urb = portdata->out_urbs[i];
- if (this_urb && this_urb->status == -EINPROGRESS)
- data_len += this_urb->transfer_buffer_length;
- }
- dbg("%s: %d", __FUNCTION__, data_len);
- return data_len;
+ dbg("%s - port %d", __FUNCTION__, port->number);
+
+ /*
+ * We can't really account for how much data we
+ * have sent out, but hasn't made it through to the
+ * device as we can't see the backend here, so just
+ * tell the tty layer that everything is flushed.
+ */
+ return 0;
}
static int sierra_open(struct usb_serial_port *port, struct file *filp)
}
}
- /* Reset low level data toggle on out endpoints */
- for (i = 0; i < N_OUT_URB; i++) {
- urb = portdata->out_urbs[i];
- if (! urb)
- continue;
- urb->dev = serial->dev;
- /* usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
- usb_pipeout(urb->pipe), 0); */
- }
-
port->tty->low_latency = 1;
/* set mode to D0 */
/* Stop reading/writing urbs */
for (i = 0; i < N_IN_URB; i++)
usb_unlink_urb(portdata->in_urbs[i]);
- for (i = 0; i < N_OUT_URB; i++)
- usb_unlink_urb(portdata->out_urbs[i]);
}
port->tty = NULL;
}
port->bulk_in_endpointAddress, USB_DIR_IN, port,
portdata->in_buffer[j], IN_BUFLEN, sierra_indat_callback);
}
-
- /* outdat endpoints */
- for (j = 0; j < N_OUT_URB; ++j) {
- portdata->out_urbs[j] = sierra_setup_urb (serial,
- port->bulk_out_endpointAddress, USB_DIR_OUT, port,
- portdata->out_buffer[j], OUT_BUFLEN, sierra_outdat_callback);
- }
}
}
if (!portdata) {
dbg("%s: kmalloc for sierra_port_private (%d) failed!.",
__FUNCTION__, i);
- return (1);
+ return -ENOMEM;
}
+ spin_lock_init(&portdata->lock);
usb_set_serial_port_data(port, portdata);
sierra_setup_urbs(serial);
- return (0);
+ return 0;
}
static void sierra_shutdown(struct usb_serial *serial)
for (j = 0; j < N_IN_URB; j++)
usb_unlink_urb(portdata->in_urbs[j]);
- for (j = 0; j < N_OUT_URB; j++)
- usb_unlink_urb(portdata->out_urbs[j]);
}
/* Now free them */
portdata->in_urbs[j] = NULL;
}
}
- for (j = 0; j < N_OUT_URB; j++) {
- if (portdata->out_urbs[j]) {
- usb_free_urb(portdata->out_urbs[j]);
- portdata->out_urbs[j] = NULL;
- }
- }
}
/* Now free per port private data */
projects / GitHub / LineageOS / android_kernel_samsung_universal7580.git / commitdiff