Commit 9fda620a authored by Johan Hovold's avatar Johan Hovold
Browse files

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



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: default avatarJohan Hovold <johan@kernel.org>
parent 6538808c

drivers/usb/serial/pl2303.c

+55 −2
Original line number Diff line number Diff line
@@ -218,6 +218,59 @@ static int pl2303_probe(struct usb_serial *serial, 
	return 0;

}



static int pl2303_calc_num_ports(struct usb_serial *serial,

					struct usb_serial_endpoints *epds)

{

	struct usb_interface *interface = serial->interface;

	struct usb_device *dev = serial->dev;

	struct device *ddev = &interface->dev;

	struct usb_host_interface *iface_desc;

	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;

				}

			}

		}



		/* 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;

		}

	}

	/* END HORRIBLE HACK FOR PL2303 */



	if (epds->num_interrupt_in < 1) {

		dev_err(ddev, "required interrupt-in endpoint missing\n");

		return -ENODEV;

	}



	return 1;

}



static int pl2303_startup(struct usb_serial *serial)

{

	struct pl2303_serial_private *spriv;
@@ -930,10 +983,9 @@ static struct usb_serial_driver pl2303_device = { 
		.name =		"pl2303",

	},

	.id_table =		id_table,

	.num_ports =		1,

	.num_bulk_in =		1,

	.num_bulk_out =		1,

	.num_interrupt_in =	1,

	.num_interrupt_in =	0,	/* see pl2303_calc_num_ports */

	.bulk_in_size =		256,

	.bulk_out_size =	256,

	.open =			pl2303_open,
@@ -949,6 +1001,7 @@ static struct usb_serial_driver pl2303_device = { 
	.process_read_urb =	pl2303_process_read_urb,

	.read_int_callback =	pl2303_read_int_callback,

	.probe =		pl2303_probe,

	.calc_num_ports =	pl2303_calc_num_ports,

	.attach =		pl2303_startup,

	.release =		pl2303_release,

	.port_probe =		pl2303_port_probe,

drivers/usb/serial/usb-serial.c

+0 −40
Original line number Diff line number Diff line
@@ -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 ||

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