CHROMIUM: gobi: resubmit interrupt urb on failed reads

drivers/net/usb/gobi/qmi.c

Index: drivers/net/usb/gobi/qmi.c
diff --git a/drivers/net/usb/gobi/qmi.c b/drivers/net/usb/gobi/qmi.c
new file mode 100644
index 0000000000000000000000000000000000000000..cdbdbaf7acc2bc022c54c68d6177fccb86414636
--- /dev/null
+++ b/drivers/net/usb/gobi/qmi.c
@@ -0,0 +1,358 @@
+/* qmi.c - QMI protocol implementation
+ * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include "qmi.h"
+
+#include <linux/slab.h>
+
+struct qmux {
+	u8 tf;	/* always 1 */
+	u16 len;
+	u8 ctrl;
+	u8 service;
+	u8 qmicid;
+} __attribute__((__packed__));
+
+struct getcid_req {
+	struct qmux header;
+	u8 req;
+	u8 tid;
+	u16 msgid;
+	u16 tlvsize;
+	u8 service;
+	u16 size;
+	u8 qmisvc;
+} __attribute__((__packed__));
+
+struct releasecid_req {
+	struct qmux header;
+	u8 req;
+	u8 tid;
+	u16 msgid;
+	u16 tlvsize;
+	u8 rlscid;
+	u16 size;
+	u16 cid;
+} __attribute__((__packed__));
+
+struct ready_req {
+	struct qmux header;
+	u8 req;
+	u8 tid;
+	u16 msgid;
+	u16 tlvsize;
+} __attribute__((__packed__));
+
+struct seteventreport_req {
+	struct qmux header;
+	u8 req;
+	u16 tid;
+	u16 msgid;
+	u16 tlvsize;
+	u8 reportchanrate;
+	u16 size;
+	u8 period;
+	u32 mask;
+} __attribute__((__packed__));
+
+struct getpkgsrvcstatus_req {
+	struct qmux header;
+	u8 req;
+	u16 tid;
+	u16 msgid;
+	u16 tlvsize;
+} __attribute__((__packed__));
+
+struct getmeid_req {
+	struct qmux header;
+	u8 req;
+	u16 tid;
+	u16 msgid;
+	u16 tlvsize;
+} __attribute__((__packed__));
+
+const size_t qmux_size = sizeof(struct qmux);
+
+void *qmictl_new_getcid(u8 tid, u8 svctype, size_t *size)
+{
+	struct getcid_req *req = kmalloc(sizeof(*req), GFP_KERNEL);
+	if (!req)
+		return NULL;
+	req->req = 0x00;
+	req->tid = tid;
+	req->msgid = 0x0022;
+	req->tlvsize = 0x0004;
+	req->service = 0x01;
+	req->size = 0x0001;
+	req->qmisvc = svctype;
+	*size = sizeof(*req);
+	return req;
+}
+
+void *qmictl_new_releasecid(u8 tid, u16 cid, size_t *size)
+{
+	struct releasecid_req *req = kmalloc(sizeof(*req), GFP_KERNEL);
+	if (!req)
+		return NULL;
+	req->req = 0x00;
+	req->tid = tid;
+	req->msgid = 0x0023;
+	req->tlvsize = 0x05;
+	req->rlscid = 0x01;
+	req->size = 0x0002;
+	req->cid = cid;
+	*size = sizeof(*req);
+	return req;
+}
+
+void *qmictl_new_ready(u8 tid, size_t *size)
+{
+	struct ready_req *req = kmalloc(sizeof(*req), GFP_KERNEL);
+	if (!req)
+		return NULL;
+	req->req = 0x00;
+	req->tid = tid;
+	req->msgid = 0x21;
+	req->tlvsize = 0;
+	*size = sizeof(*req);
+	return req;
+}
+
+void *qmiwds_new_seteventreport(u8 tid, size_t *size)
+{
+	struct seteventreport_req *req = kmalloc(sizeof(*req), GFP_KERNEL);
+	req->req = 0x00;
+	req->tid = tid;
+	req->msgid = 0x0001;
+	req->tlvsize = 0x0008;
+	req->reportchanrate = 0x11;
+	req->size = 0x0005;
+	req->period = 0x01;
+	req->mask = 0x000000ff;
+	*size = sizeof(*req);
+	return req;
+}
+
+void *qmiwds_new_getpkgsrvcstatus(u8 tid, size_t *size)
+{
+	struct getpkgsrvcstatus_req *req = kmalloc(sizeof(*req), GFP_KERNEL);
+	if (!req)
+		return NULL;
+	req->req = 0x00;
+	req->tid = tid;
+	req->msgid = 0x22;
+	req->tlvsize = 0x0000;
+	*size = sizeof(*req);
+	return req;
+}
+
+void *qmidms_new_getmeid(u8 tid, size_t *size)
+{
+	struct getmeid_req *req = kmalloc(sizeof(*req), GFP_KERNEL);
+	if (!req)
+		return NULL;
+	req->req = 0x00;
+	req->tid = tid;
+	req->msgid = 0x25;
+	req->tlvsize = 0x0000;
+	*size = sizeof(*req);
+	return req;
+}
+
+int qmux_parse(u16 *cid, void *buf, size_t size)
+{
+	struct qmux *qmux = buf;
+
+	if (!buf || size < 12)
+		return -ENOMEM;
+
+	if (qmux->tf != 1 || qmux->len != size - 1 || qmux->ctrl != 0x80)
+		return -EINVAL;
+
+	*cid = (qmux->qmicid << 8) + qmux->service;
+	return sizeof(*qmux);
+}
+
+int qmux_fill(u16 cid, void *buf, size_t size)
+{
+	struct qmux *qmux = buf;
+
+	if (!buf || size < sizeof(*qmux))
+		return -ENOMEM;
+
+	qmux->tf = 1;
+	qmux->len = size - 1;
+	qmux->ctrl = 0;
+	qmux->service = cid & 0xff;
+	qmux->qmicid = cid >> 8;
+	return 0;
+}
+
+static u16 tlv_get(void *msg, u16 msgsize, u8 type, void *buf, u16 bufsize)
+{
+	u16 pos;
+	u16 msize = 0;
+
+	if (!msg || !buf)
+		return -ENOMEM;
+
+	for (pos = 4;  pos + 3 < msgsize; pos += msize + 3) {
+		msize = *(u16 *)(msg + pos + 1);
+		if (*(u8 *)(msg + pos) == type) {
+			if (bufsize < msize)
+				return -ENOMEM;
+
+			memcpy(buf, msg + pos + 3, msize);
+			return msize;
+		}
+	}
+
+	return -ENOMSG;
+}
+
+int qmi_msgisvalid(void *msg, u16 size)
+{
+	char tlv[4];
+
+	if (tlv_get(msg, size, 2, &tlv[0], 4) == 4) {
+		if (*(u16 *)&tlv[0] != 0)
+			return *(u16 *)&tlv[2];
+		else
+			return 0;
+	}
+	return -ENOMSG;
+}
+
+int qmi_msgid(void *msg, u16 size)
+{
+	return size < 2 ? -ENODATA : *(u16 *)msg;
+}
+
+int qmictl_alloccid_resp(void *buf, u16 size, u16 *cid)
+{
+	int result;
+	u8 offset = sizeof(struct qmux) + 2;
+
+	if (!buf || size < offset)
+		return -ENOMEM;
+
+	buf = buf + offset;
+	size -= offset;
+
+	result = qmi_msgid(buf, size);
+	if (result != 0x22)
+		return -EFAULT;
+
+	result = qmi_msgisvalid(buf, size);
+	if (result != 0)
+		return -EFAULT;
+
+	result = tlv_get(buf, size, 0x01, cid, 2);
+	if (result != 2)
+		return -EFAULT;
+
+	return 0;
+}
+
+int qmictl_freecid_resp(void *buf, u16 size)
+{
+	int result;
+	u8 offset = sizeof(struct qmux) + 2;
+
+	if (!buf || size < offset)
+		return -ENOMEM;
+
+	buf = buf + offset;
+	size -= offset;
+
+	result = qmi_msgid(buf, size);
+	if (result != 0x23)
+		return -EFAULT;
+
+	result = qmi_msgisvalid(buf, size);
+	if (result != 0)
+		return -EFAULT;
+
+	return 0;
+}
+
+int qmiwds_event_resp(void *buf, u16 size, struct qmiwds_stats *stats)
+{
+	int result;
+	u8 status[2];
+
+	u8 offset = sizeof(struct qmux) + 3;
+
+	if (!buf || size < offset || !stats)
+		return -ENOMEM;
+
+	buf = buf + offset;
+	size -= offset;
+
+	result = qmi_msgid(buf, size);
+	if (result == 0x01) {
+		tlv_get(buf, size, 0x10, &stats->txok, 4);
+		tlv_get(buf, size, 0x11, &stats->rxok, 4);
+		tlv_get(buf, size, 0x12, &stats->txerr, 4);
+		tlv_get(buf, size, 0x13, &stats->rxerr, 4);
+		tlv_get(buf, size, 0x14, &stats->txofl, 4);
+		tlv_get(buf, size, 0x15, &stats->rxofl, 4);
+		tlv_get(buf, size, 0x19, &stats->txbytesok, 8);
+		tlv_get(buf, size, 0x1A, &stats->rxbytesok, 8);
+	} else if (result == 0x22) {
+		result = tlv_get(buf, size, 0x01, &status[0], 2);
+		if (result >= 1)
+			stats->linkstate = status[0] == 0x02;
+		if (result == 2)
+			stats->reconfigure = status[1] == 0x01;
+
+		if (result < 0)
+			return result;
+	} else {
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+int qmidms_meid_resp(void *buf,	u16 size, char *meid, int meidsize)
+{
+	int result;
+
+	u8 offset = sizeof(struct qmux) + 3;
+
+	if (!buf || size < offset || meidsize < 14)
+		return -ENOMEM;
+
+	buf = buf + offset;
+	size -= offset;
+
+	result = qmi_msgid(buf, size);
+	if (result != 0x25)
+		return -EFAULT;
+
+	result = qmi_msgisvalid(buf, size);
+	if (result)
+		return -EFAULT;
+
+	result = tlv_get(buf, size, 0x12, meid, 14);
+	if (result != 14)
+		return -EFAULT;
+
+	return 0;
+}