#define DRIVER_AUTHOR "Oliver Neukum"
#define DRIVER_DESC "USB Abstract Control Model driver for USB WCM Device Management"
+#define HUAWEI_VENDOR_ID 0x12D1
+
static const struct usb_device_id wdm_ids[] = {
{
.match_flags = USB_DEVICE_ID_MATCH_INT_CLASS |
.bInterfaceClass = USB_CLASS_COMM,
.bInterfaceSubClass = USB_CDC_SUBCLASS_DMM
},
+ {
+ /*
+ * Huawei E392, E398 and possibly other Qualcomm based modems
+ * embed the Qualcomm QMI protocol inside CDC on CDC ECM like
+ * control interfaces. Userspace access to this is required
+ * to configure the accompanying data interface
+ */
+ .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
+ USB_DEVICE_ID_MATCH_INT_INFO,
+ .idVendor = HUAWEI_VENDOR_ID,
+ .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+ .bInterfaceSubClass = 1,
+ .bInterfaceProtocol = 9, /* NOTE: CDC ECM control interface! */
+ },
{ }
};
#define WDM_POLL_RUNNING 6
#define WDM_RESPONDING 7
#define WDM_SUSPENDING 8
+#define WDM_RESETTING 9
#define WDM_MAX 16
+/* CDC-WMC r1.1 requires wMaxCommand to be "at least 256 decimal (0x100)" */
+#define WDM_DEFAULT_BUFSIZE 256
static DEFINE_MUTEX(wdm_mutex);
u16 bufsize;
u16 wMaxCommand;
u16 wMaxPacketSize;
- u16 bMaxPacketSize0;
__le16 inum;
int reslength;
int length;
int count;
dma_addr_t shandle;
dma_addr_t ihandle;
- struct mutex lock;
+ struct mutex wlock;
+ struct mutex rlock;
wait_queue_head_t wait;
struct work_struct rxwork;
int werr;
int rv = 0;
int status = urb->status;
struct wdm_device *desc;
- struct usb_ctrlrequest *req;
struct usb_cdc_notification *dr;
desc = urb->context;
- req = desc->irq;
dr = (struct usb_cdc_notification *)desc->sbuf;
if (status) {
goto exit;
}
- req->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE);
- req->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
- req->wValue = 0;
- req->wIndex = desc->inum;
- req->wLength = cpu_to_le16(desc->wMaxCommand);
-
- usb_fill_control_urb(
- desc->response,
- interface_to_usbdev(desc->intf),
- /* using common endpoint 0 */
- usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0),
- (unsigned char *)req,
- desc->inbuf,
- desc->wMaxCommand,
- wdm_in_callback,
- desc
- );
- desc->response->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
spin_lock(&desc->iuspin);
clear_bit(WDM_READ, &desc->flags);
set_bit(WDM_RESPONDING, &desc->flags);
static void cleanup(struct wdm_device *desc)
{
- usb_free_coherent(interface_to_usbdev(desc->intf),
- desc->wMaxPacketSize,
- desc->sbuf,
- desc->validity->transfer_dma);
- usb_free_coherent(interface_to_usbdev(desc->intf),
- desc->bMaxPacketSize0,
- desc->inbuf,
- desc->response->transfer_dma);
+ kfree(desc->sbuf);
+ kfree(desc->inbuf);
kfree(desc->orq);
kfree(desc->irq);
kfree(desc->ubuf);
}
/* concurrent writes and disconnect */
- r = mutex_lock_interruptible(&desc->lock);
+ r = mutex_lock_interruptible(&desc->wlock);
rv = -ERESTARTSYS;
if (r) {
kfree(buf);
else
if (test_bit(WDM_IN_USE, &desc->flags))
r = -EAGAIN;
+
+ if (test_bit(WDM_RESETTING, &desc->flags))
+ r = -EIO;
+
if (r < 0) {
kfree(buf);
goto out;
out:
usb_autopm_put_interface(desc->intf);
outnp:
- mutex_unlock(&desc->lock);
+ mutex_unlock(&desc->wlock);
outnl:
return rv < 0 ? rv : count;
}
static ssize_t wdm_read
(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
{
- int rv, cntr = 0;
+ int rv, cntr;
int i = 0;
struct wdm_device *desc = file->private_data;
- rv = mutex_lock_interruptible(&desc->lock); /*concurrent reads */
+ rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */
if (rv < 0)
return -ERESTARTSYS;
- if (desc->length == 0) {
+ cntr = ACCESS_ONCE(desc->length);
+ if (cntr == 0) {
desc->read = 0;
retry:
if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
rv = -ENODEV;
goto err;
}
+ if (test_bit(WDM_RESETTING, &desc->flags)) {
+ rv = -EIO;
+ goto err;
+ }
usb_mark_last_busy(interface_to_usbdev(desc->intf));
if (rv < 0) {
rv = -ERESTARTSYS;
goto retry;
}
clear_bit(WDM_READ, &desc->flags);
+ cntr = desc->length;
spin_unlock_irq(&desc->iuspin);
}
- cntr = count > desc->length ? desc->length : count;
+ if (cntr > count)
+ cntr = count;
rv = copy_to_user(buffer, desc->ubuf, cntr);
if (rv > 0) {
rv = -EFAULT;
goto err;
}
+ spin_lock_irq(&desc->iuspin);
+
for (i = 0; i < desc->length - cntr; i++)
desc->ubuf[i] = desc->ubuf[i + cntr];
/* in case we had outstanding data */
if (!desc->length)
clear_bit(WDM_READ, &desc->flags);
+
+ spin_unlock_irq(&desc->iuspin);
+
rv = cntr;
err:
- mutex_unlock(&desc->lock);
+ mutex_unlock(&desc->rlock);
return rv;
}
}
intf->needs_remote_wakeup = 1;
- mutex_lock(&desc->lock);
+ /* using write lock to protect desc->count */
+ mutex_lock(&desc->wlock);
if (!desc->count++) {
desc->werr = 0;
desc->rerr = 0;
} else {
rv = 0;
}
- mutex_unlock(&desc->lock);
+ mutex_unlock(&desc->wlock);
usb_autopm_put_interface(desc->intf);
out:
mutex_unlock(&wdm_mutex);
struct wdm_device *desc = file->private_data;
mutex_lock(&wdm_mutex);
- mutex_lock(&desc->lock);
+
+ /* using write lock to protect desc->count */
+ mutex_lock(&desc->wlock);
desc->count--;
- mutex_unlock(&desc->lock);
+ mutex_unlock(&desc->wlock);
if (!desc->count) {
dev_dbg(&desc->intf->dev, "wdm_release: cleanup");
static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
int rv = -EINVAL;
- struct usb_device *udev = interface_to_usbdev(intf);
struct wdm_device *desc;
struct usb_host_interface *iface;
struct usb_endpoint_descriptor *ep;
struct usb_cdc_dmm_desc *dmhd;
u8 *buffer = intf->altsetting->extra;
int buflen = intf->altsetting->extralen;
- u16 maxcom = 0;
+ u16 maxcom = WDM_DEFAULT_BUFSIZE;
if (!buffer)
goto out;
desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL);
if (!desc)
goto out;
- mutex_init(&desc->lock);
+ mutex_init(&desc->rlock);
+ mutex_init(&desc->wlock);
spin_lock_init(&desc->iuspin);
init_waitqueue_head(&desc->wait);
desc->wMaxCommand = maxcom;
goto err;
desc->wMaxPacketSize = usb_endpoint_maxp(ep);
- desc->bMaxPacketSize0 = udev->descriptor.bMaxPacketSize0;
desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
if (!desc->orq)
if (!desc->ubuf)
goto err;
- desc->sbuf = usb_alloc_coherent(interface_to_usbdev(intf),
- desc->wMaxPacketSize,
- GFP_KERNEL,
- &desc->validity->transfer_dma);
+ desc->sbuf = kmalloc(desc->wMaxPacketSize, GFP_KERNEL);
if (!desc->sbuf)
goto err;
- desc->inbuf = usb_alloc_coherent(interface_to_usbdev(intf),
- desc->bMaxPacketSize0,
- GFP_KERNEL,
- &desc->response->transfer_dma);
+ desc->inbuf = kmalloc(desc->wMaxCommand, GFP_KERNEL);
if (!desc->inbuf)
- goto err2;
+ goto err;
usb_fill_int_urb(
desc->validity,
desc,
ep->bInterval
);
- desc->validity->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+ desc->irq->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE);
+ desc->irq->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE;
+ desc->irq->wValue = 0;
+ desc->irq->wIndex = desc->inum;
+ desc->irq->wLength = cpu_to_le16(desc->wMaxCommand);
+
+ usb_fill_control_urb(
+ desc->response,
+ interface_to_usbdev(intf),
+ /* using common endpoint 0 */
+ usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0),
+ (unsigned char *)desc->irq,
+ desc->inbuf,
+ desc->wMaxCommand,
+ wdm_in_callback,
+ desc
+ );
usb_set_intfdata(intf, desc);
rv = usb_register_dev(intf, &wdm_class);
if (rv < 0)
- goto err3;
+ goto err2;
else
- dev_info(&intf->dev, "cdc-wdm%d: USB WDM device\n",
- intf->minor - WDM_MINOR_BASE);
+ dev_info(&intf->dev, "%s: USB WDM device\n", dev_name(intf->usb_dev));
out:
return rv;
-err3:
- usb_set_intfdata(intf, NULL);
- usb_free_coherent(interface_to_usbdev(desc->intf),
- desc->bMaxPacketSize0,
- desc->inbuf,
- desc->response->transfer_dma);
err2:
- usb_free_coherent(interface_to_usbdev(desc->intf),
- desc->wMaxPacketSize,
- desc->sbuf,
- desc->validity->transfer_dma);
+ usb_set_intfdata(intf, NULL);
err:
free_urbs(desc);
+ kfree(desc->inbuf);
+ kfree(desc->sbuf);
kfree(desc->ubuf);
kfree(desc->orq);
kfree(desc->irq);
/* to terminate pending flushes */
clear_bit(WDM_IN_USE, &desc->flags);
spin_unlock_irqrestore(&desc->iuspin, flags);
- mutex_lock(&desc->lock);
+ wake_up_all(&desc->wait);
+ mutex_lock(&desc->rlock);
+ mutex_lock(&desc->wlock);
kill_urbs(desc);
cancel_work_sync(&desc->rxwork);
- mutex_unlock(&desc->lock);
- wake_up_all(&desc->wait);
+ mutex_unlock(&desc->wlock);
+ mutex_unlock(&desc->rlock);
if (!desc->count)
cleanup(desc);
mutex_unlock(&wdm_mutex);
dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor);
/* if this is an autosuspend the caller does the locking */
- if (!PMSG_IS_AUTO(message))
- mutex_lock(&desc->lock);
+ if (!PMSG_IS_AUTO(message)) {
+ mutex_lock(&desc->rlock);
+ mutex_lock(&desc->wlock);
+ }
spin_lock_irq(&desc->iuspin);
if (PMSG_IS_AUTO(message) &&
kill_urbs(desc);
cancel_work_sync(&desc->rxwork);
}
- if (!PMSG_IS_AUTO(message))
- mutex_unlock(&desc->lock);
+ if (!PMSG_IS_AUTO(message)) {
+ mutex_unlock(&desc->wlock);
+ mutex_unlock(&desc->rlock);
+ }
return rv;
}
{
struct wdm_device *desc = usb_get_intfdata(intf);
- mutex_lock(&desc->lock);
- kill_urbs(desc);
-
/*
* we notify everybody using poll of
* an exceptional situation
* message from the device is lost
*/
spin_lock_irq(&desc->iuspin);
+ set_bit(WDM_RESETTING, &desc->flags); /* inform read/write */
+ set_bit(WDM_READ, &desc->flags); /* unblock read */
+ clear_bit(WDM_IN_USE, &desc->flags); /* unblock write */
desc->rerr = -EINTR;
spin_unlock_irq(&desc->iuspin);
wake_up_all(&desc->wait);
+ mutex_lock(&desc->rlock);
+ mutex_lock(&desc->wlock);
+ kill_urbs(desc);
+ cancel_work_sync(&desc->rxwork);
return 0;
}
struct wdm_device *desc = usb_get_intfdata(intf);
int rv;
+ clear_bit(WDM_RESETTING, &desc->flags);
rv = recover_from_urb_loss(desc);
- mutex_unlock(&desc->lock);
+ mutex_unlock(&desc->wlock);
+ mutex_unlock(&desc->rlock);
return 0;
}
git.openpandora.org / pandora-kernel.git / blobdiff