Re: [Bluez-devel] Reset card

[Joshua Wright <jwright@hasborg.com>]

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Marcel Holtmann wrote:
> feel free to send me a patch for the bccmd tool that I can include 
> into the bluez-utils distribution.

Thanks to all who replied.  Simon's code was exactly what was needed,
and the CSR BCCMD documentation was very helpful.

Attached is a patch to automatically reset CSR cards after changing the
BD_ADDR with the bdaddr utility.

Thanks,

- -Josh
- --
- -Joshua Wright
jwright@hasborg.com

2005-2006 pgpkey: http://802.11ninja.net/pgpkey.htm
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Today I stumbled across the world's largest hotspot.  The SSID is "linksys".
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--- bdaddr.c	2005-05-09 14:33:24.000000000 -0400
+++ bdaddr-jlw.c	2005-08-19 12:15:03.000000000 -0400
@@ -103,6 +103,40 @@
 }
 #endif
 
+static int csr_cold_reset(int dd)
+{
+	unsigned char cmd[] = { 0x02, 0x00, /* message type */
+				0x09, 0x00, /* message length */
+				0x00, 0x00, /* seqno for pairing response */
+				0x01, 0x40, /* varid for cold reset */
+				0x00, 0x00, /* status */
+				/* payload follows, must be at least at least
+				   4 uint16s in length accordind to BCCMD */
+				0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
+
+	unsigned char cp[254], rp[254];
+	struct hci_request rq;
+
+	memset(&cp, 0, sizeof(cp));
+	cp[0] = 0xc2;
+	memcpy(cp + 1, cmd, sizeof(cmd));
+
+	memset(&rq, 0, sizeof(rq));
+	rq.ogf	= OGF_VENDOR_CMD;
+	rq.ocf	= 0x00;
+	rq.event  = EVT_VENDOR;
+	rq.cparam = cp;
+	rq.clen   = sizeof(cmd) + 1;
+	rq.rparam = rp;
+	rq.rlen   = sizeof(rp);
+
+	if (hci_send_req(dd, &rq, 2000) < 0)
+		return -1;
+
+	return 0;
+}
+
+
 static int csr_write_bd_addr(int dd, bdaddr_t *bdaddr)
 {
 	unsigned char cmd[] = { 0x02, 0x00, 0x0c, 0x00, 0x11, 0x47, 0x03, 0x70,
@@ -291,7 +325,16 @@
 				exit(1);
 			}
 
-			printf("Address changed - Reset device now\n");
+			if (ver.manufacturer == 10) { /* CSR devices */
+				if (csr_cold_reset(dd) != 0) {
+					fprintf(stderr, "Error resetting card, remove and insert manually.\n");
+					exit(1);
+				} else {
+					printf("Address changed - card reset successfully\n");
+				}
+			} else { /* non-CSR devices */
+				printf("Address changed - Reset device now\n");
+			}
 
 			//ioctl(dd, HCIDEVRESET, dev);
 			//ioctl(dd, HCIDEVDOWN, dev);