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USB: serial: pl2303: clean up legacy endpoint hack 

Implement the "horrible endpoint hack" for some legacy devices as a
quirk and clean up the code somewhat.

Note that the bulk-endpoint check can be removed as core will already
have verified this.

Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2017-03-16 17:13:35 +01:00
parent 9fda620a5f
commit 9d717271d6
1 changed files with 46 additions and 38 deletions
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84
drivers/usb/serial/pl2303.c
View File

@ -33,9 +33,11 @@
#define PL2303_QUIRK_UART_STATE_IDX0 BIT(0)
#define PL2303_QUIRK_LEGACY BIT(1)
#define PL2303_QUIRK_ENDPOINT_HACK BIT(2)
static const struct usb_device_id id_table[] = {
{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID),
.driver_info = PL2303_QUIRK_ENDPOINT_HACK },
{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_DCU11) },
{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
@ -48,7 +50,8 @@ static const struct usb_device_id id_table[] = {
{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_ZTEK) },
{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID_RSAQ5) },
{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID),
.driver_info = PL2303_QUIRK_ENDPOINT_HACK },
{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID2) },
{ USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
{ USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
@ -68,7 +71,8 @@ static const struct usb_device_id id_table[] = {
.driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X75),
.driver_info = PL2303_QUIRK_UART_STATE_IDX0 },
{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81) },
{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_EF81),
.driver_info = PL2303_QUIRK_ENDPOINT_HACK },
{ USB_DEVICE(BENQ_VENDOR_ID, BENQ_PRODUCT_ID_S81) }, /* Benq/Siemens S81 */
{ USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
{ USB_DEVICE(NOKIA_CA42_VENDOR_ID, NOKIA_CA42_PRODUCT_ID) },
@ -78,7 +82,8 @@ static const struct usb_device_id id_table[] = {
{ USB_DEVICE(SPEEDDRAGON_VENDOR_ID, SPEEDDRAGON_PRODUCT_ID) },
{ USB_DEVICE(DATAPILOT_U2_VENDOR_ID, DATAPILOT_U2_PRODUCT_ID) },
{ USB_DEVICE(BELKIN_VENDOR_ID, BELKIN_PRODUCT_ID) },
{ USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID) },
{ USB_DEVICE(ALCOR_VENDOR_ID, ALCOR_PRODUCT_ID),
.driver_info = PL2303_QUIRK_ENDPOINT_HACK },
{ USB_DEVICE(WS002IN_VENDOR_ID, WS002IN_PRODUCT_ID) },
{ USB_DEVICE(COREGA_VENDOR_ID, COREGA_PRODUCT_ID) },
{ USB_DEVICE(YCCABLE_VENDOR_ID, YCCABLE_PRODUCT_ID) },
@ -218,7 +223,12 @@ static int pl2303_probe(struct usb_serial *serial,
return 0;
}
static int pl2303_calc_num_ports(struct usb_serial *serial,
/*
* Use interrupt endpoint from first interface if available.
*
* This is needed due to the looney way its endpoints are set up.
*/
static int pl2303_endpoint_hack(struct usb_serial *serial,
struct usb_serial_endpoints *epds)
{
struct usb_interface *interface = serial->interface;
@ -228,43 +238,41 @@ static int pl2303_calc_num_ports(struct usb_serial *serial,
struct usb_endpoint_descriptor *endpoint;
unsigned int i;
/* 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]) {
/* 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;
}
}
}
if (interface == dev->actconfig->interface[0])
return 0;
/* 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");
return -ENODEV;
}
/* 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))
continue;
dev_dbg(ddev, "found interrupt in on separate interface\n");
if (epds->num_interrupt_in < ARRAY_SIZE(epds->interrupt_in))
epds->interrupt_in[epds->num_interrupt_in++] = endpoint;
}
return 0;
}
static int pl2303_calc_num_ports(struct usb_serial *serial,
struct usb_serial_endpoints *epds)
{
unsigned long quirks = (unsigned long)usb_get_serial_data(serial);
struct device *dev = &serial->interface->dev;
int ret;
if (quirks & PL2303_QUIRK_ENDPOINT_HACK) {
ret = pl2303_endpoint_hack(serial, epds);
if (ret)
return ret;
}
/* END HORRIBLE HACK FOR PL2303 */
if (epds->num_interrupt_in < 1) {
dev_err(ddev, "required interrupt-in endpoint missing\n");
dev_err(dev, "required interrupt-in endpoint missing\n");
return -ENODEV;
}