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https://github.com/edk2-porting/linux-next.git
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4f4e8f6989
This is V2 of the patch, after feedback from Clemens and Daniel. This patch adds SuperSpeed support to the USB drivers under sound/. It adds tests for USB_SPEED_SUPER to the appropriate places that check for the USB speed. This patch has been tested with our SS USB3 device emulating a set of Yamaha speakers and a Logitech microphone, but with the descriptors modified to add USB3 support. It has also been tested with the real speakers and microphone, to make sure that USB2 devices still work. Signed-off-by: Paul Zimmerman <paulz@synopsys.com> Cc: Clemens Ladisch <clemens@ladisch.de> Cc: Daniel Mack <daniel@caiaq.de> Cc: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
119 lines
2.8 KiB
C
119 lines
2.8 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#include "usbaudio.h"
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#include "helper.h"
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/*
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* combine bytes and get an integer value
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*/
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unsigned int snd_usb_combine_bytes(unsigned char *bytes, int size)
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{
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switch (size) {
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case 1: return *bytes;
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case 2: return combine_word(bytes);
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case 3: return combine_triple(bytes);
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case 4: return combine_quad(bytes);
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default: return 0;
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}
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}
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/*
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* parse descriptor buffer and return the pointer starting the given
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* descriptor type.
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*/
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void *snd_usb_find_desc(void *descstart, int desclen, void *after, u8 dtype)
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{
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u8 *p, *end, *next;
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p = descstart;
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end = p + desclen;
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for (; p < end;) {
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if (p[0] < 2)
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return NULL;
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next = p + p[0];
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if (next > end)
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return NULL;
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if (p[1] == dtype && (!after || (void *)p > after)) {
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return p;
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}
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p = next;
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}
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return NULL;
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}
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/*
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* find a class-specified interface descriptor with the given subtype.
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*/
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void *snd_usb_find_csint_desc(void *buffer, int buflen, void *after, u8 dsubtype)
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{
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unsigned char *p = after;
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while ((p = snd_usb_find_desc(buffer, buflen, p,
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USB_DT_CS_INTERFACE)) != NULL) {
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if (p[0] >= 3 && p[2] == dsubtype)
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return p;
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}
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return NULL;
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}
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/*
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* Wrapper for usb_control_msg().
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* Allocates a temp buffer to prevent dmaing from/to the stack.
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*/
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int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe, __u8 request,
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__u8 requesttype, __u16 value, __u16 index, void *data,
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__u16 size, int timeout)
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{
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int err;
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void *buf = NULL;
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if (size > 0) {
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buf = kmemdup(data, size, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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}
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err = usb_control_msg(dev, pipe, request, requesttype,
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value, index, buf, size, timeout);
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if (size > 0) {
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memcpy(data, buf, size);
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kfree(buf);
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}
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return err;
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}
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unsigned char snd_usb_parse_datainterval(struct snd_usb_audio *chip,
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struct usb_host_interface *alts)
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{
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switch (snd_usb_get_speed(chip->dev)) {
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case USB_SPEED_HIGH:
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case USB_SPEED_SUPER:
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if (get_endpoint(alts, 0)->bInterval >= 1 &&
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get_endpoint(alts, 0)->bInterval <= 4)
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return get_endpoint(alts, 0)->bInterval - 1;
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break;
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default:
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break;
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}
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return 0;
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}
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