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nusb/lib: provide a setalt() function to set the interface to its altsetting

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This commit is contained in:
cinap_lenrek 2022-02-23 18:00:34 +00:00
parent 9cd55a085d
commit bea20cd152
2 changed files with 11 additions and 0 deletions
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10
sys/src/cmd/nusb/lib/dev.c
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@ -482,6 +482,16 @@ unstall(Dev *dev, Dev *ep, int dir)
return 0;
}
int
setalt(Dev *d, Iface *ifc)
{
if(usbcmd(d, Rh2d|Rstd|Riface, Rsetiface, ifc->alt, ifc->id, nil, 0) < 0){
werrstr("setalt: %s: %r", d->dir);
return -1;
}
return 0;
}
/*
* To be sure it uses a single write.
*/

1
sys/src/cmd/nusb/lib/usb.h
View file

@ -353,5 +353,6 @@ int parsedev(Dev *xd, uchar *b, int n);
int unstall(Dev *dev, Dev *ep, int dir);
int usbcmd(Dev *d, int type, int req, int value, int index, uchar *data, int count);
Dev* getdev(char *devid);
int setalt(Dev *d, Iface *ifc);
extern int usbdebug; /* more messages for bigger values */