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USB: serial: move pl2303 hack out of usb-serial core

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Some pl2303 devices require the use of the interrupt endpoint of an
unrelated interface. This has so far been dealt with in usb-serial core,
but can now be moved to a driver calc_num_ports callback.

Note that we relax the endpoint requirements checked by core and instead
verify that we have an interrupt-in endpoint in calc_num_ports for all
devices so that the hack can first be applied.

Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold
2017-03-16 17:13:34 +01:00
parent 6538808c56
commit 9fda620a5f
2 changed files with 55 additions and 42 deletions
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40
drivers/usb/serial/usb-serial.c
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@@ -38,7 +38,6 @@
#include <linux/usb/serial.h>
#include <linux/kfifo.h>
#include <linux/idr.h>
#include "pl2303.h"
#define DRIVER_AUTHOR "Greg Kroah-Hartman <gregkh@linuxfoundation.org>"
#define DRIVER_DESC "USB Serial Driver core"
@@ -803,45 +802,6 @@ static int usb_serial_probe(struct usb_interface *interface,
find_endpoints(serial, epds);
#if IS_ENABLED(CONFIG_USB_SERIAL_PL2303)
/* BEGIN HORRIBLE HACK FOR PL2303 */
/* this is needed due to the looney way its endpoints are set up */
if (((le16_to_cpu(dev->descriptor.idVendor) == PL2303_VENDOR_ID) &&
(le16_to_cpu(dev->descriptor.idProduct) == PL2303_PRODUCT_ID)) ||
((le16_to_cpu(dev->descriptor.idVendor) == ATEN_VENDOR_ID) &&
(le16_to_cpu(dev->descriptor.idProduct) == ATEN_PRODUCT_ID)) ||
((le16_to_cpu(dev->descriptor.idVendor) == ALCOR_VENDOR_ID) &&
(le16_to_cpu(dev->descriptor.idProduct) == ALCOR_PRODUCT_ID)) ||
((le16_to_cpu(dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
(le16_to_cpu(dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_EF81))) {
if (interface != dev->actconfig->interface[0]) {
struct usb_host_interface *iface_desc;
/* check out the endpoints of the other interface*/
iface_desc = dev->actconfig->interface[0]->cur_altsetting;
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if (usb_endpoint_is_int_in(endpoint)) {
/* we found a interrupt in endpoint */
dev_dbg(ddev, "found interrupt in for Prolific device on separate interface\n");
if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
}
}
}
/* Now make sure the PL-2303 is configured correctly.
* If not, give up now and hope this hack will work
* properly during a later invocation of usb_serial_probe
*/
if (epds->num_bulk_in == 0 || epds->num_bulk_out == 0) {
dev_info(ddev, "PL-2303 hack: descriptors matched but endpoints did not\n");
retval = -ENODEV;
goto err_free_epds;
}
}
/* END HORRIBLE HACK FOR PL2303 */
#endif
if (epds->num_bulk_in < type->num_bulk_in ||
epds->num_bulk_out < type->num_bulk_out ||
epds->num_interrupt_in < type->num_interrupt_in ||