[Qemu-devel] [PATCH 18/26] hw/usb/dev-smartcard-reader.c: copy atr's protocol to ccid's parameters (adds todo's)

[Alon Levy <alevy@redhat.com>]

From: Alon Levy <alon@pobox.com>

Signed-off-by: Alon Levy <alevy@redhat.com>
---
 hw/usb/dev-smartcard-reader.c | 46 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/hw/usb/dev-smartcard-reader.c b/hw/usb/dev-smartcard-reader.c
index 6894f36..522fefa 100644
--- a/hw/usb/dev-smartcard-reader.c
+++ b/hw/usb/dev-smartcard-reader.c
@@ -839,14 +839,60 @@ static void ccid_write_data_block_answer(USBCCIDState *s,
     ccid_write_data_block(s, slot, seq, data, len);
 }
 
+static uint8_t atr_get_protocol_num(const uint8_t *atr, uint32_t len)
+{
+    int i;
+
+    if (len < 2 || !(atr[1] & 0x80)) {
+        /* too short or TD1 not included */
+        return 0; /* T=0, default */
+    }
+    i = 1 + !!(atr[1] & 0x10) + !!(atr[1] & 0x20) + !!(atr[1] & 0x40);
+    i += !!(atr[1] & 0x80);
+    return atr[i] & 0x0f;
+}
+
 static void ccid_write_data_block_atr(USBCCIDState *s, CCID_Header *recv)
 {
     const uint8_t *atr = NULL;
     uint32_t len = 0;
+    uint8_t atr_protocol_num;
+    CCID_T0ProtocolDataStructure *t0 = &s->abProtocolDataStructure.t0;
+    CCID_T1ProtocolDataStructure *t1 = &s->abProtocolDataStructure.t1;
 
     if (s->card) {
         atr = ccid_card_get_atr(s->card, &len);
     }
+    atr_protocol_num = atr_get_protocol_num(atr, len);
+    DPRINTF(s, D_VERBOSE, "%s: atr contains protocol=%d\n", __func__,
+            atr_protocol_num);
+    /* set parameters from ATR - see spec page 109 */
+    s->bProtocolNum = (atr_protocol_num <= 1 ? atr_protocol_num
+                                             : s->bProtocolNum);
+    if (atr_protocol_num == 0) {
+        DPRINTF(s, D_WARN, "%s: error: unimplemented ATR T0 parameters"
+                " setting\n", __func__);
+        t0->bmFindexDindex = 0;
+        t0->bmTCCKST0 = 0;
+        t0->bGuardTimeT0 = 0;
+        t0->bWaitingIntegerT0 = 0;
+        t0->bClockStop = 0;
+    } else {
+        if (atr_protocol_num != 1) {
+            DPRINTF(s, D_WARN, "%s: error: unsupported ATR protocol %d\n",
+                    __func__, atr_protocol_num);
+        } else {
+            DPRINTF(s, D_WARN, "%s: error: unimplemented ATR T1 parameters"
+                    " setting\n", __func__);
+            t1->bmFindexDindex = 0;
+            t1->bmTCCKST1 = 0;
+            t1->bGuardTimeT1 = 0;
+            t1->bWaitingIntegerT1 = 0;
+            t1->bClockStop = 0;
+            t1->bIFSC = 0;
+            t1->bNadValue = 0;
+        }
+    }
     ccid_write_data_block(s, recv->bSlot, recv->bSeq, atr, len);
 }
 
-- 
1.8.1.4