1 files changed, 860 insertions, 0 deletions

diff --git a/drivers/staging/dream/smd/smd_qmi.c b/drivers/staging/dream/smd/smd_qmi.c
new file mode 100644
index 000000000000..d4e7d8804626
--- /dev/null
+++ b/drivers/staging/dream/smd/smd_qmi.c
@@ -0,0 +1,860 @@
+/* arch/arm/mach-msm/smd_qmi.c
+ *
+ * QMI Control Driver -- Manages network data connections.
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Author: Brian Swetland <swetland@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/miscdevice.h>
+#include <linux/workqueue.h>
+#include <linux/wakelock.h>
+
+#include <asm/uaccess.h>
+#include <mach/msm_smd.h>
+
+#define QMI_CTL 0x00
+#define QMI_WDS 0x01
+#define QMI_DMS 0x02
+#define QMI_NAS 0x03
+
+#define QMI_RESULT_SUCCESS 0x0000
+#define QMI_RESULT_FAILURE 0x0001
+
+struct qmi_msg {
+	unsigned char service;
+	unsigned char client_id;
+	unsigned short txn_id;
+	unsigned short type;
+	unsigned short size;
+	unsigned char *tlv;
+};
+
+#define qmi_ctl_client_id 0
+
+#define STATE_OFFLINE    0
+#define STATE_QUERYING   1
+#define STATE_ONLINE     2
+
+struct qmi_ctxt {
+	struct miscdevice misc;
+
+	struct mutex lock;
+
+	unsigned char ctl_txn_id;
+	unsigned char wds_client_id;
+	unsigned short wds_txn_id;
+
+	unsigned wds_busy;
+	unsigned wds_handle;
+	unsigned state_dirty;
+	unsigned state;
+
+	unsigned char addr[4];
+	unsigned char mask[4];
+	unsigned char gateway[4];
+	unsigned char dns1[4];
+	unsigned char dns2[4];
+
+	smd_channel_t *ch;
+	const char *ch_name;
+	struct wake_lock wake_lock;
+
+	struct work_struct open_work;
+	struct work_struct read_work;
+};
+
+static struct qmi_ctxt *qmi_minor_to_ctxt(unsigned n);
+
+static void qmi_read_work(struct work_struct *ws);
+static void qmi_open_work(struct work_struct *work);
+
+void qmi_ctxt_init(struct qmi_ctxt *ctxt, unsigned n)
+{
+	mutex_init(&ctxt->lock);
+	INIT_WORK(&ctxt->read_work, qmi_read_work);
+	INIT_WORK(&ctxt->open_work, qmi_open_work);
+	wake_lock_init(&ctxt->wake_lock, WAKE_LOCK_SUSPEND, ctxt->misc.name);
+	ctxt->ctl_txn_id = 1;
+	ctxt->wds_txn_id = 1;
+	ctxt->wds_busy = 1;
+	ctxt->state = STATE_OFFLINE;
+
+}
+
+static struct workqueue_struct *qmi_wq;
+
+static int verbose = 0;
+
+/* anyone waiting for a state change waits here */
+static DECLARE_WAIT_QUEUE_HEAD(qmi_wait_queue);
+
+
+static void qmi_dump_msg(struct qmi_msg *msg, const char *prefix)
+{
+	unsigned sz, n;
+	unsigned char *x;
+
+	if (!verbose)
+		return;
+
+	printk(KERN_INFO
+	       "qmi: %s: svc=%02x cid=%02x tid=%04x type=%04x size=%04x\n",
+	       prefix, msg->service, msg->client_id,
+	       msg->txn_id, msg->type, msg->size);
+
+	x = msg->tlv;
+	sz = msg->size;
+
+	while (sz >= 3) {
+		sz -= 3;
+
+		n = x[1] | (x[2] << 8);
+		if (n > sz)
+			break;
+
+		printk(KERN_INFO "qmi: %s: tlv: %02x %04x { ",
+		       prefix, x[0], n);
+		x += 3;
+		sz -= n;
+		while (n-- > 0)
+			printk("%02x ", *x++);
+		printk("}\n");
+	}
+}
+
+int qmi_add_tlv(struct qmi_msg *msg,
+		unsigned type, unsigned size, const void *data)
+{
+	unsigned char *x = msg->tlv + msg->size;
+
+	x[0] = type;
+	x[1] = size;
+	x[2] = size >> 8;
+
+	memcpy(x + 3, data, size);
+
+	msg->size += (size + 3);
+
+	return 0;
+}
+
+/* Extract a tagged item from a qmi message buffer,
+** taking care not to overrun the buffer.
+*/
+static int qmi_get_tlv(struct qmi_msg *msg,
+		       unsigned type, unsigned size, void *data)
+{
+	unsigned char *x = msg->tlv;
+	unsigned len = msg->size;
+	unsigned n;
+
+	while (len >= 3) {
+		len -= 3;
+
+		/* size of this item */
+		n = x[1] | (x[2] << 8);
+		if (n > len)
+			break;
+
+		if (x[0] == type) {
+			if (n != size)
+				return -1;
+			memcpy(data, x + 3, size);
+			return 0;
+		}
+
+		x += (n + 3);
+		len -= n;
+	}
+
+	return -1;
+}
+
+static unsigned qmi_get_status(struct qmi_msg *msg, unsigned *error)
+{
+	unsigned short status[2];
+	if (qmi_get_tlv(msg, 0x02, sizeof(status), status)) {
+		*error = 0;
+		return QMI_RESULT_FAILURE;
+	} else {
+		*error = status[1];
+		return status[0];
+	}
+}
+
+/* 0x01 <qmux-header> <payload> */
+#define QMUX_HEADER    13
+
+/* should be >= HEADER + FOOTER */
+#define QMUX_OVERHEAD  16
+
+static int qmi_send(struct qmi_ctxt *ctxt, struct qmi_msg *msg)
+{
+	unsigned char *data;
+	unsigned hlen;
+	unsigned len;
+	int r;
+
+	qmi_dump_msg(msg, "send");
+
+	if (msg->service == QMI_CTL) {
+		hlen = QMUX_HEADER - 1;
+	} else {
+		hlen = QMUX_HEADER;
+	}
+
+	/* QMUX length is total header + total payload - IFC selector */
+	len = hlen + msg->size - 1;
+	if (len > 0xffff)
+		return -1;
+
+	data = msg->tlv - hlen;
+
+	/* prepend encap and qmux header */
+	*data++ = 0x01; /* ifc selector */
+
+	/* qmux header */
+	*data++ = len;
+	*data++ = len >> 8;
+	*data++ = 0x00; /* flags: client */
+	*data++ = msg->service;
+	*data++ = msg->client_id;
+
+	/* qmi header */
+	*data++ = 0x00; /* flags: send */
+	*data++ = msg->txn_id;
+	if (msg->service != QMI_CTL)
+		*data++ = msg->txn_id >> 8;
+
+	*data++ = msg->type;
+	*data++ = msg->type >> 8;
+	*data++ = msg->size;
+	*data++ = msg->size >> 8;
+
+	/* len + 1 takes the interface selector into account */
+	r = smd_write(ctxt->ch, msg->tlv - hlen, len + 1);
+
+	if (r != len) {
+		return -1;
+	} else {
+		return 0;
+	}
+}
+
+static void qmi_process_ctl_msg(struct qmi_ctxt *ctxt, struct qmi_msg *msg)
+{
+	unsigned err;
+	if (msg->type == 0x0022) {
+		unsigned char n[2];
+		if (qmi_get_status(msg, &err))
+			return;
+		if (qmi_get_tlv(msg, 0x01, sizeof(n), n))
+			return;
+		if (n[0] == QMI_WDS) {
+			printk(KERN_INFO
+			       "qmi: ctl: wds use client_id 0x%02x\n", n[1]);
+			ctxt->wds_client_id = n[1];
+			ctxt->wds_busy = 0;
+		}
+	}
+}
+
+static int qmi_network_get_profile(struct qmi_ctxt *ctxt);
+
+static void swapaddr(unsigned char *src, unsigned char *dst)
+{
+	dst[0] = src[3];
+	dst[1] = src[2];
+	dst[2] = src[1];
+	dst[3] = src[0];
+}
+
+static unsigned char zero[4];
+static void qmi_read_runtime_profile(struct qmi_ctxt *ctxt, struct qmi_msg *msg)
+{
+	unsigned char tmp[4];
+	unsigned r;
+
+	r = qmi_get_tlv(msg, 0x1e, 4, tmp);
+	swapaddr(r ? zero : tmp, ctxt->addr);
+	r = qmi_get_tlv(msg, 0x21, 4, tmp);
+	swapaddr(r ? zero : tmp, ctxt->mask);
+	r = qmi_get_tlv(msg, 0x20, 4, tmp);
+	swapaddr(r ? zero : tmp, ctxt->gateway);
+	r = qmi_get_tlv(msg, 0x15, 4, tmp);
+	swapaddr(r ? zero : tmp, ctxt->dns1);
+	r = qmi_get_tlv(msg, 0x16, 4, tmp);
+	swapaddr(r ? zero : tmp, ctxt->dns2);
+}
+
+static void qmi_process_unicast_wds_msg(struct qmi_ctxt *ctxt,
+					struct qmi_msg *msg)
+{
+	unsigned err;
+	switch (msg->type) {
+	case 0x0021:
+		if (qmi_get_status(msg, &err)) {
+			printk(KERN_ERR
+			       "qmi: wds: network stop failed (%04x)\n", err);
+		} else {
+			printk(KERN_INFO
+			       "qmi: wds: network stopped\n");
+			ctxt->state = STATE_OFFLINE;
+			ctxt->state_dirty = 1;
+		}
+		break;
+	case 0x0020:
+		if (qmi_get_status(msg, &err)) {
+			printk(KERN_ERR
+			       "qmi: wds: network start failed (%04x)\n", err);
+		} else if (qmi_get_tlv(msg, 0x01, sizeof(ctxt->wds_handle), &ctxt->wds_handle)) {
+			printk(KERN_INFO
+			       "qmi: wds no handle?\n");
+		} else {
+			printk(KERN_INFO
+			       "qmi: wds: got handle 0x%08x\n",
+			       ctxt->wds_handle);
+		}
+		break;
+	case 0x002D:
+		printk("qmi: got network profile\n");
+		if (ctxt->state == STATE_QUERYING) {
+			qmi_read_runtime_profile(ctxt, msg);
+			ctxt->state = STATE_ONLINE;
+			ctxt->state_dirty = 1;
+		}
+		break;
+	default:
+		printk(KERN_ERR "qmi: unknown msg type 0x%04x\n", msg->type);
+	}
+	ctxt->wds_busy = 0;
+}
+
+static void qmi_process_broadcast_wds_msg(struct qmi_ctxt *ctxt,
+					  struct qmi_msg *msg)
+{
+	if (msg->type == 0x0022) {
+		unsigned char n[2];
+		if (qmi_get_tlv(msg, 0x01, sizeof(n), n))
+			return;
+		switch (n[0]) {
+		case 1:
+			printk(KERN_INFO "qmi: wds: DISCONNECTED\n");
+			ctxt->state = STATE_OFFLINE;
+			ctxt->state_dirty = 1;
+			break;
+		case 2:
+			printk(KERN_INFO "qmi: wds: CONNECTED\n");
+			ctxt->state = STATE_QUERYING;
+			ctxt->state_dirty = 1;
+			qmi_network_get_profile(ctxt);
+			break;
+		case 3:
+			printk(KERN_INFO "qmi: wds: SUSPENDED\n");
+			ctxt->state = STATE_OFFLINE;
+			ctxt->state_dirty = 1;
+		}
+	} else {
+		printk(KERN_ERR "qmi: unknown bcast msg type 0x%04x\n", msg->type);
+	}
+}
+
+static void qmi_process_wds_msg(struct qmi_ctxt *ctxt,
+				struct qmi_msg *msg)
+{
+	printk("wds: %04x @ %02x\n", msg->type, msg->client_id);
+	if (msg->client_id == ctxt->wds_client_id) {
+		qmi_process_unicast_wds_msg(ctxt, msg);
+	} else if (msg->client_id == 0xff) {
+		qmi_process_broadcast_wds_msg(ctxt, msg);
+	} else {
+		printk(KERN_ERR
+		       "qmi_process_wds_msg client id 0x%02x unknown\n",
+		       msg->client_id);
+	}
+}
+
+static void qmi_process_qmux(struct qmi_ctxt *ctxt,
+			     unsigned char *buf, unsigned sz)
+{
+	struct qmi_msg msg;
+
+	/* require a full header */
+	if (sz < 5)
+		return;
+
+	/* require a size that matches the buffer size */
+	if (sz != (buf[0] | (buf[1] << 8)))
+		return;
+
+	/* only messages from a service (bit7=1) are allowed */
+	if (buf[2] != 0x80)
+		return;
+
+	msg.service = buf[3];
+	msg.client_id = buf[4];
+
+	/* annoyingly, CTL messages have a shorter TID */
+	if (buf[3] == 0) {
+		if (sz < 7)
+			return;
+		msg.txn_id = buf[6];
+		buf += 7;
+		sz -= 7;
+	} else {
+		if (sz < 8)
+			return;
+		msg.txn_id = buf[6] | (buf[7] << 8);
+		buf += 8;
+		sz -= 8;
+	}
+
+	/* no type and size!? */
+	if (sz < 4)
+		return;
+	sz -= 4;
+
+	msg.type = buf[0] | (buf[1] << 8);
+	msg.size = buf[2] | (buf[3] << 8);
+	msg.tlv = buf + 4;
+
+	if (sz != msg.size)
+		return;
+
+	qmi_dump_msg(&msg, "recv");
+
+	mutex_lock(&ctxt->lock);
+	switch (msg.service) {
+	case QMI_CTL:
+		qmi_process_ctl_msg(ctxt, &msg);
+		break;
+	case QMI_WDS:
+		qmi_process_wds_msg(ctxt, &msg);
+		break;
+	default:
+		printk(KERN_ERR "qmi: msg from unknown svc 0x%02x\n",
+		       msg.service);
+		break;
+	}
+	mutex_unlock(&ctxt->lock);
+
+	wake_up(&qmi_wait_queue);
+}
+
+#define QMI_MAX_PACKET (256 + QMUX_OVERHEAD)
+
+static void qmi_read_work(struct work_struct *ws)
+{
+	struct qmi_ctxt *ctxt = container_of(ws, struct qmi_ctxt, read_work);
+	struct smd_channel *ch = ctxt->ch;
+	unsigned char buf[QMI_MAX_PACKET];
+	int sz;
+
+	for (;;) {
+		sz = smd_cur_packet_size(ch);
+		if (sz == 0)
+			break;
+		if (sz < smd_read_avail(ch))
+			break;
+		if (sz > QMI_MAX_PACKET) {
+			smd_read(ch, 0, sz);
+			continue;
+		}
+		if (smd_read(ch, buf, sz) != sz) {
+			printk(KERN_ERR "qmi: not enough data?!\n");
+			continue;
+		}
+
+		/* interface selector must be 1 */
+		if (buf[0] != 0x01)
+			continue;
+
+		qmi_process_qmux(ctxt, buf + 1, sz - 1);
+	}
+}
+
+static int qmi_request_wds_cid(struct qmi_ctxt *ctxt);
+
+static void qmi_open_work(struct work_struct *ws)
+{
+	struct qmi_ctxt *ctxt = container_of(ws, struct qmi_ctxt, open_work);
+	mutex_lock(&ctxt->lock);
+	qmi_request_wds_cid(ctxt);
+	mutex_unlock(&ctxt->lock);
+}
+
+static void qmi_notify(void *priv, unsigned event)
+{
+	struct qmi_ctxt *ctxt = priv;
+
+	switch (event) {
+	case SMD_EVENT_DATA: {
+		int sz;
+		sz = smd_cur_packet_size(ctxt->ch);
+		if ((sz > 0) && (sz <= smd_read_avail(ctxt->ch))) {
+			wake_lock_timeout(&ctxt->wake_lock, HZ / 2);
+			queue_work(qmi_wq, &ctxt->read_work);
+		}
+		break;
+	}
+	case SMD_EVENT_OPEN:
+		printk(KERN_INFO "qmi: smd opened\n");
+		queue_work(qmi_wq, &ctxt->open_work);
+		break;
+	case SMD_EVENT_CLOSE:
+		printk(KERN_INFO "qmi: smd closed\n");
+		break;
+	}
+}
+
+static int qmi_request_wds_cid(struct qmi_ctxt *ctxt)
+{
+	unsigned char data[64 + QMUX_OVERHEAD];
+	struct qmi_msg msg;
+	unsigned char n;
+
+	msg.service = QMI_CTL;
+	msg.client_id = qmi_ctl_client_id;
+	msg.txn_id = ctxt->ctl_txn_id;
+	msg.type = 0x0022;
+	msg.size = 0;
+	msg.tlv = data + QMUX_HEADER;
+
+	ctxt->ctl_txn_id += 2;
+
+	n = QMI_WDS;
+	qmi_add_tlv(&msg, 0x01, 0x01, &n);
+
+	return qmi_send(ctxt, &msg);
+}
+
+static int qmi_network_get_profile(struct qmi_ctxt *ctxt)
+{
+	unsigned char data[96 + QMUX_OVERHEAD];
+	struct qmi_msg msg;
+
+	msg.service = QMI_WDS;
+	msg.client_id = ctxt->wds_client_id;
+	msg.txn_id = ctxt->wds_txn_id;
+	msg.type = 0x002D;
+	msg.size = 0;
+	msg.tlv = data + QMUX_HEADER;
+
+	ctxt->wds_txn_id += 2;
+
+	return qmi_send(ctxt, &msg);
+}
+
+static int qmi_network_up(struct qmi_ctxt *ctxt, char *apn)
+{
+	unsigned char data[96 + QMUX_OVERHEAD];
+	struct qmi_msg msg;
+	char *auth_type;
+	char *user;
+	char *pass;
+
+	for (user = apn; *user; user++) {
+		if (*user == ' ') {
+			*user++ = 0;
+			break;
+		}
+	}
+	for (pass = user; *pass; pass++) {
+		if (*pass == ' ') {
+			*pass++ = 0;
+			break;
+		}
+	}
+
+	for (auth_type = pass; *auth_type; auth_type++) {
+		if (*auth_type == ' ') {
+			*auth_type++ = 0;
+			break;
+		}
+	}
+
+	msg.service = QMI_WDS;
+	msg.client_id = ctxt->wds_client_id;
+	msg.txn_id = ctxt->wds_txn_id;
+	msg.type = 0x0020;
+	msg.size = 0;
+	msg.tlv = data + QMUX_HEADER;
+
+	ctxt->wds_txn_id += 2;
+
+	qmi_add_tlv(&msg, 0x14, strlen(apn), apn);
+	if (*auth_type)
+		qmi_add_tlv(&msg, 0x16, strlen(auth_type), auth_type);
+	if (*user) {
+		if (!*auth_type) {
+			unsigned char x;
+			x = 3;
+			qmi_add_tlv(&msg, 0x16, 1, &x);
+		}
+		qmi_add_tlv(&msg, 0x17, strlen(user), user);
+		if (*pass)
+			qmi_add_tlv(&msg, 0x18, strlen(pass), pass);
+	}
+	return qmi_send(ctxt, &msg);
+}
+
+static int qmi_network_down(struct qmi_ctxt *ctxt)
+{
+	unsigned char data[16 + QMUX_OVERHEAD];
+	struct qmi_msg msg;
+
+	msg.service = QMI_WDS;
+	msg.client_id = ctxt->wds_client_id;
+	msg.txn_id = ctxt->wds_txn_id;
+	msg.type = 0x0021;
+	msg.size = 0;
+	msg.tlv = data + QMUX_HEADER;
+
+	ctxt->wds_txn_id += 2;
+
+	qmi_add_tlv(&msg, 0x01, sizeof(ctxt->wds_handle), &ctxt->wds_handle);
+
+	return qmi_send(ctxt, &msg);
+}
+
+static int qmi_print_state(struct qmi_ctxt *ctxt, char *buf, int max)
+{
+	int i;
+	char *statename;
+
+	if (ctxt->state == STATE_ONLINE) {
+		statename = "up";
+	} else if (ctxt->state == STATE_OFFLINE) {
+		statename = "down";
+	} else {
+		statename = "busy";
+	}
+
+	i = scnprintf(buf, max, "STATE=%s\n", statename);
+	i += scnprintf(buf + i, max - i, "CID=%d\n",ctxt->wds_client_id);
+
+	if (ctxt->state != STATE_ONLINE){
+		return i;
+	}
+
+	i += scnprintf(buf + i, max - i, "ADDR=%d.%d.%d.%d\n",
+		ctxt->addr[0], ctxt->addr[1], ctxt->addr[2], ctxt->addr[3]);
+	i += scnprintf(buf + i, max - i, "MASK=%d.%d.%d.%d\n",
+		ctxt->mask[0], ctxt->mask[1], ctxt->mask[2], ctxt->mask[3]);
+	i += scnprintf(buf + i, max - i, "GATEWAY=%d.%d.%d.%d\n",
+		ctxt->gateway[0], ctxt->gateway[1], ctxt->gateway[2],
+		ctxt->gateway[3]);
+	i += scnprintf(buf + i, max - i, "DNS1=%d.%d.%d.%d\n",
+		ctxt->dns1[0], ctxt->dns1[1], ctxt->dns1[2], ctxt->dns1[3]);
+	i += scnprintf(buf + i, max - i, "DNS2=%d.%d.%d.%d\n",
+		ctxt->dns2[0], ctxt->dns2[1], ctxt->dns2[2], ctxt->dns2[3]);
+
+	return i;
+}
+
+static ssize_t qmi_read(struct file *fp, char __user *buf,
+			size_t count, loff_t *pos)
+{
+	struct qmi_ctxt *ctxt = fp->private_data;
+	char msg[256];
+	int len;
+	int r;
+
+	mutex_lock(&ctxt->lock);
+	for (;;) {
+		if (ctxt->state_dirty) {
+			ctxt->state_dirty = 0;
+			len = qmi_print_state(ctxt, msg, 256);
+			break;
+		}
+		mutex_unlock(&ctxt->lock);
+		r = wait_event_interruptible(qmi_wait_queue, ctxt->state_dirty);
+		if (r < 0)
+			return r;
+		mutex_lock(&ctxt->lock);
+	}
+	mutex_unlock(&ctxt->lock);
+
+	if (len > count)
+		len = count;
+
+	if (copy_to_user(buf, msg, len))
+		return -EFAULT;
+
+	return len;
+}
+
+
+static ssize_t qmi_write(struct file *fp, const char __user *buf,
+			 size_t count, loff_t *pos)
+{
+	struct qmi_ctxt *ctxt = fp->private_data;
+	unsigned char cmd[64];
+	int len;
+	int r;
+
+	if (count < 1)
+		return 0;
+
+	len = count > 63 ? 63 : count;
+
+	if (copy_from_user(cmd, buf, len))
+		return -EFAULT;
+
+	cmd[len] = 0;
+
+	/* lazy */
+	if (cmd[len-1] == '\n') {
+		cmd[len-1] = 0;
+		len--;
+	}
+
+	if (!strncmp(cmd, "verbose", 7)) {
+		verbose = 1;
+	} else if (!strncmp(cmd, "terse", 5)) {
+		verbose = 0;
+	} else if (!strncmp(cmd, "poll", 4)) {
+		ctxt->state_dirty = 1;
+		wake_up(&qmi_wait_queue);
+	} else if (!strncmp(cmd, "down", 4)) {
+retry_down:
+		mutex_lock(&ctxt->lock);
+		if (ctxt->wds_busy) {
+			mutex_unlock(&ctxt->lock);
+			r = wait_event_interruptible(qmi_wait_queue, !ctxt->wds_busy);
+			if (r < 0)
+				return r;
+			goto retry_down;
+		}
+		ctxt->wds_busy = 1;
+		qmi_network_down(ctxt);
+		mutex_unlock(&ctxt->lock);
+	} else if (!strncmp(cmd, "up:", 3)) {
+retry_up:
+		mutex_lock(&ctxt->lock);
+		if (ctxt->wds_busy) {
+			mutex_unlock(&ctxt->lock);
+			r = wait_event_interruptible(qmi_wait_queue, !ctxt->wds_busy);
+			if (r < 0)
+				return r;
+			goto retry_up;
+		}
+		ctxt->wds_busy = 1;
+		qmi_network_up(ctxt, cmd+3);
+		mutex_unlock(&ctxt->lock);
+	} else {
+		return -EINVAL;
+	}
+
+	return count;
+}
+
+static int qmi_open(struct inode *ip, struct file *fp)
+{
+	struct qmi_ctxt *ctxt = qmi_minor_to_ctxt(MINOR(ip->i_rdev));
+	int r = 0;
+
+	if (!ctxt) {
+		printk(KERN_ERR "unknown qmi misc %d\n", MINOR(ip->i_rdev));
+		return -ENODEV;
+	}
+
+	fp->private_data = ctxt;
+
+	mutex_lock(&ctxt->lock);
+	if (ctxt->ch == 0)
+		r = smd_open(ctxt->ch_name, &ctxt->ch, ctxt, qmi_notify);
+	if (r == 0)
+		wake_up(&qmi_wait_queue);
+	mutex_unlock(&ctxt->lock);
+
+	return r;
+}
+
+static int qmi_release(struct inode *ip, struct file *fp)
+{
+	return 0;
+}
+
+static struct file_operations qmi_fops = {
+	.owner = THIS_MODULE,
+	.read = qmi_read,
+	.write = qmi_write,
+	.open = qmi_open,
+	.release = qmi_release,
+};
+
+static struct qmi_ctxt qmi_device0 = {
+	.ch_name = "SMD_DATA5_CNTL",
+	.misc = {
+		.minor = MISC_DYNAMIC_MINOR,
+		.name = "qmi0",
+		.fops = &qmi_fops,
+	}
+};
+static struct qmi_ctxt qmi_device1 = {
+	.ch_name = "SMD_DATA6_CNTL",
+	.misc = {
+		.minor = MISC_DYNAMIC_MINOR,
+		.name = "qmi1",
+		.fops = &qmi_fops,
+	}
+};
+static struct qmi_ctxt qmi_device2 = {
+	.ch_name = "SMD_DATA7_CNTL",
+	.misc = {
+		.minor = MISC_DYNAMIC_MINOR,
+		.name = "qmi2",
+		.fops = &qmi_fops,
+	}
+};
+
+static struct qmi_ctxt *qmi_minor_to_ctxt(unsigned n)
+{
+	if (n == qmi_device0.misc.minor)
+		return &qmi_device0;
+	if (n == qmi_device1.misc.minor)
+		return &qmi_device1;
+	if (n == qmi_device2.misc.minor)
+		return &qmi_device2;
+	return 0;
+}
+
+static int __init qmi_init(void)
+{
+	int ret;
+
+	qmi_wq = create_singlethread_workqueue("qmi");
+	if (qmi_wq == 0)
+		return -ENOMEM;
+
+	qmi_ctxt_init(&qmi_device0, 0);
+	qmi_ctxt_init(&qmi_device1, 1);
+	qmi_ctxt_init(&qmi_device2, 2);
+
+	ret = misc_register(&qmi_device0.misc);
+	if (ret == 0)
+		ret = misc_register(&qmi_device1.misc);
+	if (ret == 0)
+		ret = misc_register(&qmi_device2.misc);
+	return ret;
+}
+
+module_init(qmi_init);