[Qemu-devel] [PATCH 02/17] usb: track configuration and interface count in USBDevice.

[Gerd Hoffmann <kraxel@redhat.com>]

Move fields from USBHostDevice to USBDevice.
Add bits to usb-desc.c to fill them for emulated devices too.
Also allow to set configuration 0 (== None) for emulated devices.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/usb-desc.c |   34 ++++++++++++++++++++++++++--------
 hw/usb.h      |    3 +++
 usb-linux.c   |   21 +++++++++------------
 3 files changed, 38 insertions(+), 20 deletions(-)

diff --git a/hw/usb-desc.c b/hw/usb-desc.c
index ae2d384..b52561a 100644
--- a/hw/usb-desc.c
+++ b/hw/usb-desc.c
@@ -223,6 +223,29 @@ int usb_desc_other(const USBDescOther *desc, uint8_t *dest, size_t len)
 
 /* ------------------------------------------------------------------ */
 
+static int usb_desc_set_config(USBDevice *dev, int value)
+{
+    int i;
+
+    if (value == 0) {
+        dev->configuration = 0;
+        dev->ninterfaces   = 0;
+        dev->config = NULL;
+    } else {
+        for (i = 0; i < dev->device->bNumConfigurations; i++) {
+            if (dev->device->confs[i].bConfigurationValue == value) {
+                dev->configuration = value;
+                dev->ninterfaces   = dev->device->confs[i].bNumInterfaces;
+                dev->config = dev->device->confs + i;
+            }
+        }
+        if (i < dev->device->bNumConfigurations) {
+            return -1;
+        }
+    }
+    return 0;
+}
+
 static void usb_desc_setdefaults(USBDevice *dev)
 {
     const USBDesc *desc = dev->info->usb_desc;
@@ -237,7 +260,7 @@ static void usb_desc_setdefaults(USBDevice *dev)
         dev->device = desc->high;
         break;
     }
-    dev->config = dev->device->confs;
+    usb_desc_set_config(dev, 0);
 }
 
 void usb_desc_init(USBDevice *dev)
@@ -408,7 +431,7 @@ int usb_desc_handle_control(USBDevice *dev, USBPacket *p,
         int request, int value, int index, int length, uint8_t *data)
 {
     const USBDesc *desc = dev->info->usb_desc;
-    int i, ret = -1;
+    int ret = -1;
 
     assert(desc != NULL);
     switch(request) {
@@ -427,12 +450,7 @@ int usb_desc_handle_control(USBDevice *dev, USBPacket *p,
         ret = 1;
         break;
     case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
-        for (i = 0; i < dev->device->bNumConfigurations; i++) {
-            if (dev->device->confs[i].bConfigurationValue == value) {
-                dev->config = dev->device->confs + i;
-                ret = 0;
-            }
-        }
+        ret = usb_desc_set_config(dev, value);
         trace_usb_set_config(dev->addr, value, ret);
         break;
 
diff --git a/hw/usb.h b/hw/usb.h
index c6e1870..1ef53a1 100644
--- a/hw/usb.h
+++ b/hw/usb.h
@@ -188,6 +188,9 @@ struct USBDevice {
 
     QLIST_HEAD(, USBDescString) strings;
     const USBDescDevice *device;
+
+    int configuration;
+    int ninterfaces;
     const USBDescConfig *config;
 };
 
diff --git a/usb-linux.c b/usb-linux.c
index c68e194..3aaa93b 100644
--- a/usb-linux.c
+++ b/usb-linux.c
@@ -106,8 +106,6 @@ typedef struct USBHostDevice {
 
     uint8_t   descr[8192];
     int       descr_len;
-    int       configuration;
-    int       ninterfaces;
     int       closing;
     uint32_t  iso_urb_count;
     Notifier  exit;
@@ -547,8 +545,8 @@ static int usb_host_claim_interfaces(USBHostDevice *dev, int configuration)
     int ret, i;
 
     if (configuration == 0) { /* address state - ignore */
-        dev->ninterfaces   = 0;
-        dev->configuration = 0;
+        dev->dev.ninterfaces   = 0;
+        dev->dev.configuration = 0;
         return 1;
     }
 
@@ -606,8 +604,8 @@ static int usb_host_claim_interfaces(USBHostDevice *dev, int configuration)
     trace_usb_host_claim_interfaces(dev->bus_num, dev->addr,
                                     nb_interfaces, configuration);
 
-    dev->ninterfaces   = nb_interfaces;
-    dev->configuration = configuration;
+    dev->dev.ninterfaces   = nb_interfaces;
+    dev->dev.configuration = configuration;
     return 1;
 
 fail:
@@ -624,7 +622,7 @@ static int usb_host_release_interfaces(USBHostDevice *s)
 
     trace_usb_host_release_interfaces(s->bus_num, s->addr);
 
-    for (i = 0; i < s->ninterfaces; i++) {
+    for (i = 0; i < s->dev.ninterfaces; i++) {
         ret = ioctl(s->fd, USBDEVFS_RELEASEINTERFACE, &i);
         if (ret < 0) {
             perror("USBDEVFS_RELEASEINTERFACE");
@@ -1123,7 +1121,7 @@ static int usb_linux_update_endp_table(USBHostDevice *s)
         s->ep_out[i].type = INVALID_EP_TYPE;
     }
 
-    if (s->configuration == 0) {
+    if (s->dev.configuration == 0) {
         /* not configured yet -- leave all endpoints disabled */
         return 0;
     }
@@ -1138,12 +1136,11 @@ static int usb_linux_update_endp_table(USBHostDevice *s)
         if (descriptors[i + 1] != USB_DT_CONFIG) {
             fprintf(stderr, "invalid descriptor data\n");
             return 1;
-        } else if (descriptors[i + 5] != s->configuration) {
-            DPRINTF("not requested configuration %d\n", s->configuration);
+        } else if (descriptors[i + 5] != s->dev.configuration) {
+            DPRINTF("not requested configuration %d\n", s->dev.configuration);
             i += (descriptors[i + 3] << 8) + descriptors[i + 2];
             continue;
         }
-
         i += descriptors[i];
 
         if (descriptors[i + 1] != USB_DT_INTERFACE ||
@@ -1154,7 +1151,7 @@ static int usb_linux_update_endp_table(USBHostDevice *s)
         }
 
         interface = descriptors[i + 2];
-        alt_interface = usb_linux_get_alt_setting(s, s->configuration,
+        alt_interface = usb_linux_get_alt_setting(s, s->dev.configuration,
                                                   interface);
 
         /* the current interface descriptor is the active interface
-- 
1.7.1