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M7350/kernel/arch/arm/mach-msm/smd_qmi.c
T f9cc65cfda M7350v1_en_gpl
2024-09-09 08:52:07 +00:00

849 lines
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/* 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 *user;
char *pass;
for (user = apn; *user; user++) {
if (*user == ' ') {
*user++ = 0;
break;
}
}
for (pass = user; *pass; pass++) {
if (*pass == ' ') {
*pass++ = 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 (*user) {
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);
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