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usb-host: fix configuration tracking.

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It is perfectly fine to leave the usb device in unconfigured state
(USBHostDevice->configuration == 0).  Just do that and wait for the
guest to explicitly set a configuration.  This is closer to what real
hardware does and it also simplifies the device initialization.  There
is no need to figure how the device is configured on the host.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2011-08-24 14:45:07 +02:00
parent 3ee886c5ba
commit eb7700bb99
1 changed files with 19 additions and 63 deletions
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82
usb-linux.c
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@ -407,8 +407,11 @@ static int usb_host_claim_interfaces(USBHostDevice *dev, int configuration)
int interface, nb_interfaces;
int ret, i;
if (configuration == 0) /* address state - ignore */
if (configuration == 0) { /* address state - ignore */
dev->ninterfaces = 0;
dev->configuration = 0;
return 1;
}
DPRINTF("husb: claiming interfaces. config %d\n", configuration);
@ -433,7 +436,7 @@ static int usb_host_claim_interfaces(USBHostDevice *dev, int configuration)
DPRINTF("husb: config #%d need %d\n", dev->descr[i + 5], configuration);
if (configuration < 0 || configuration == dev->descr[i + 5]) {
if (configuration == dev->descr[i + 5]) {
configuration = dev->descr[i + 5];
break;
}
@ -513,7 +516,7 @@ static void usb_host_handle_reset(USBDevice *dev)
ioctl(s->fd, USBDEVFS_RESET);
usb_host_claim_interfaces(s, s->configuration);
usb_host_claim_interfaces(s, 0);
usb_linux_update_endp_table(s);
}
@ -835,6 +838,7 @@ static int usb_host_set_config(USBHostDevice *s, int config)
return ctrl_error();
}
usb_host_claim_interfaces(s, config);
usb_linux_update_endp_table(s);
return 0;
}
@ -941,51 +945,6 @@ static int usb_host_handle_control(USBDevice *dev, USBPacket *p,
return USB_RET_ASYNC;
}
static int usb_linux_get_configuration(USBHostDevice *s)
{
uint8_t configuration;
struct usb_ctrltransfer ct;
int ret;
if (usb_fs_type == USB_FS_SYS) {
char device_name[32], line[1024];
int configuration;
sprintf(device_name, "%d-%s", s->bus_num, s->port);
if (!usb_host_read_file(line, sizeof(line), "bConfigurationValue",
device_name)) {
goto usbdevfs;
}
if (sscanf(line, "%d", &configuration) != 1) {
goto usbdevfs;
}
return configuration;
}
usbdevfs:
ct.bRequestType = USB_DIR_IN;
ct.bRequest = USB_REQ_GET_CONFIGURATION;
ct.wValue = 0;
ct.wIndex = 0;
ct.wLength = 1;
ct.data = &configuration;
ct.timeout = 50;
ret = ioctl(s->fd, USBDEVFS_CONTROL, &ct);
if (ret < 0) {
perror("usb_linux_get_configuration");
return -1;
}
/* in address state */
if (configuration == 0) {
return -1;
}
return configuration;
}
static uint8_t usb_linux_get_alt_setting(USBHostDevice *s,
uint8_t configuration, uint8_t interface)
{
@ -1031,16 +990,16 @@ usbdevfs:
static int usb_linux_update_endp_table(USBHostDevice *s)
{
uint8_t *descriptors;
uint8_t devep, type, configuration, alt_interface;
uint8_t devep, type, alt_interface;
int interface, length, i;
for (i = 0; i < MAX_ENDPOINTS; i++)
s->endp_table[i].type = INVALID_EP_TYPE;
i = usb_linux_get_configuration(s);
if (i < 0)
return 1;
configuration = i;
if (s->configuration == 0) {
/* not configured yet -- leave all endpoints disabled */
return 0;
}
/* get the desired configuration, interface, and endpoint descriptors
* from device description */
@ -1049,8 +1008,9 @@ static int usb_linux_update_endp_table(USBHostDevice *s)
i = 0;
if (descriptors[i + 1] != USB_DT_CONFIG ||
descriptors[i + 5] != configuration) {
DPRINTF("invalid descriptor data - configuration\n");
descriptors[i + 5] != s->configuration) {
fprintf(stderr, "invalid descriptor data - configuration %d\n",
s->configuration);
return 1;
}
i += descriptors[i];
@ -1064,7 +1024,8 @@ static int usb_linux_update_endp_table(USBHostDevice *s)
}
interface = descriptors[i + 2];
alt_interface = usb_linux_get_alt_setting(s, configuration, interface);
alt_interface = usb_linux_get_alt_setting(s, s->configuration,
interface);
/* the current interface descriptor is the active interface
* and has endpoints */
@ -1204,13 +1165,8 @@ static int usb_host_open(USBHostDevice *dev, int bus_num,
#endif
/*
* Initial configuration is -1 which makes us claim first
* available config. We used to start with 1, which does not
* always work. I've seen devices where first config starts
* with 2.
*/
if (!usb_host_claim_interfaces(dev, -1)) {
/* start unconfigured -- we'll wait for the guest to set a configuration */
if (!usb_host_claim_interfaces(dev, 0)) {
goto fail;
}