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USB: serial: mxuport: clean up port bulk-out setup 

Setup each port to use the first bulk-out endpoint in calc_num_ports so
that core allocates the corresponding port resources for us.

Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2017-03-16 17:13:56 +01:00
parent 6b0464c9d7
commit d69f138747
1 changed files with 12 additions and 91 deletions
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103
drivers/usb/serial/mxuport.c
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@ -951,6 +951,7 @@ static int mxuport_calc_num_ports(struct usb_serial *serial,
{
unsigned long features = (unsigned long)usb_get_serial_data(serial);
int num_ports;
int i;
if (features & MX_UPORT_2_PORT) {
num_ports = 2;
@ -966,6 +967,17 @@ static int mxuport_calc_num_ports(struct usb_serial *serial,
num_ports = 2;
}
/*
* Setup bulk-out endpoint multiplexing. All ports share the same
* bulk-out endpoint.
*/
BUILD_BUG_ON(ARRAY_SIZE(epds->bulk_out) < 16);
for (i = 1; i < num_ports; ++i)
epds->bulk_out[i] = epds->bulk_out[0];
epds->num_bulk_out = num_ports;
return num_ports;
}
@ -1149,102 +1161,11 @@ static int mxuport_port_probe(struct usb_serial_port *port)
port->port_number);
}
static int mxuport_alloc_write_urb(struct usb_serial *serial,
struct usb_serial_port *port,
struct usb_serial_port *port0,
int j)
{
struct usb_device *dev = interface_to_usbdev(serial->interface);
set_bit(j, &port->write_urbs_free);
port->write_urbs[j] = usb_alloc_urb(0, GFP_KERNEL);
if (!port->write_urbs[j])
return -ENOMEM;
port->bulk_out_buffers[j] = kmalloc(port0->bulk_out_size, GFP_KERNEL);
if (!port->bulk_out_buffers[j])
return -ENOMEM;
usb_fill_bulk_urb(port->write_urbs[j], dev,
usb_sndbulkpipe(dev, port->bulk_out_endpointAddress),
port->bulk_out_buffers[j],
port->bulk_out_size,
serial->type->write_bulk_callback,
port);
return 0;
}
static int mxuport_alloc_write_urbs(struct usb_serial *serial,
struct usb_serial_port *port,
struct usb_serial_port *port0)
{
int j;
int ret;
for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
ret = mxuport_alloc_write_urb(serial, port, port0, j);
if (ret)
return ret;
}
return 0;
}
static int mxuport_attach(struct usb_serial *serial)
{
struct usb_serial_port *port0 = serial->port[0];
struct usb_serial_port *port1 = serial->port[1];
struct usb_serial_port *port;
int err;
int i;
int j;
/*
* Throw away all but the first allocated write URBs so we can
* set them up again to fit the multiplexing scheme.
*/
for (i = 1; i < serial->num_bulk_out; ++i) {
port = serial->port[i];
for (j = 0; j < ARRAY_SIZE(port->write_urbs); ++j) {
usb_free_urb(port->write_urbs[j]);
kfree(port->bulk_out_buffers[j]);
port->write_urbs[j] = NULL;
port->bulk_out_buffers[j] = NULL;
}
port->write_urbs_free = 0;
}
/*
* All write data is sent over the first bulk out endpoint,
* with an added header to indicate the port. Allocate URBs
* for each port to the first bulk out endpoint.
*/
for (i = 1; i < serial->num_ports; ++i) {
port = serial->port[i];
port->bulk_out_size = port0->bulk_out_size;
port->bulk_out_endpointAddress =
port0->bulk_out_endpointAddress;
err = mxuport_alloc_write_urbs(serial, port, port0);
if (err)
return err;
port->write_urb = port->write_urbs[0];
port->bulk_out_buffer = port->bulk_out_buffers[0];
/*
* Ensure each port has a fifo. The framework only
* allocates a fifo to ports with a bulk out endpoint,
* where as we need one for every port.
*/
if (!kfifo_initialized(&port->write_fifo)) {
err = kfifo_alloc(&port->write_fifo, PAGE_SIZE,
GFP_KERNEL);
if (err)
return err;
}
}
/*
* All data from the ports is received on the first bulk in