On 2008-05-13, Aaron Glenn <aaron.glenn@gmail.com> wrote:
quoted text
> I'm trying to get my Sierra Wireless MC5720 modem to work and I'm not
> having much luck.

I don't know if this is useful or a red herring, but when this id was
added to Linux, they also added code which "ensures that the device
is turned on when inserted into the system." They use it for all
devices supported by the driver, they don't match to any particular
device. http://lkml.org/lkml/2007/1/17/188

Looking at usb_control_msg details on http://tinyurl.com/539896 and
this from the above diff:

+	__u16 set_mode_dzero = 0x0000;
...
+	/*set mode to D0 */
+	result = usb_control_msg(serial->dev,
+			usb_rcvctrlpipe(serial->dev, 0),
+			0x00,0x40,set_mode_dzero,0,NULL,0,USB_CTRL_SET_TIMEOUT);
                        |||| |||| `----value---' | `data
                request-'''' ````-request type   `index

I baked the somewhat random diff below, if it doesn't help I don't
know where else to look, and if it does help count me quite surprised!
It does at least compile :)

quoted text
> In a vain attempt to school myself, I've tried to ktrace and gdb my
> way into figuring out why I can't get this card to work. Doing a "cu
> -l /dev/cuaU0 -s<whatever>" ends in a hard lock.

I am no kernel wizard but if it's hanging in the kernel, that
behaviour seems reasonable. There are other ways, but the simplest
is probably to sprinkle some printf..


Index: umsm.c
===================================================================
RCS file: /cvs/src/sys/dev/usb/umsm.c,v
retrieving revision 1.25
diff -u -p -r1.25 umsm.c
--- umsm.c	12 May 2008 12:24:43 -0000	1.25
+++ umsm.c	13 May 2008 12:15:04 -0000
@@ -45,11 +45,14 @@ int     umsmdebug = 1;
 
 #define DPRINTF(x) DPRINTFN(0, x)
 
-
 #define UMSMBUFSZ	4096
 #define	UMSM_INTR_INTERVAL	100	/* ms */
+
 #define E220_MODE_CHANGE_REQUEST 0x2
 
+#define UMSM_SET_POWER_REQUEST	0x0
+#define UMSM_POWER_MODE_D0	0x0000
+
 int umsm_match(struct device *, void *, void *); 
 void umsm_attach(struct device *, struct device *, void *); 
 int umsm_detach(struct device *, int); 
@@ -61,6 +64,7 @@ void umsm_intr(usbd_xfer_handle, usbd_pr
 void umsm_get_status(void *, int, u_char *, u_char *);
 
 usbd_status umsm_e220_changemode(usbd_device_handle);
+usbd_status umsm_set_power_dzero(usbd_device_handle);
 
 struct umsm_softc {
 	struct device		 sc_dev;
@@ -180,6 +184,7 @@ umsm_attach(struct device *parent, struc
 	sc->sc_udev = uaa->device;
 	sc->sc_iface = uaa->iface;
 
+	umsm_set_power_dzero(uaa->device);
 	id = usbd_get_interface_descriptor(sc->sc_iface);
 
 	if (id == NULL || id->bInterfaceClass == UICLASS_MASS) {
@@ -391,6 +396,25 @@ umsm_e220_changemode(usbd_device_handle 
 
 	err = usbd_do_request(dev, &req, 0);
 	if (err) 
+		return (EIO);
+
+	return (0);
+}
+
+usbd_status
+umsm_set_power_dzero(usbd_device_handle dev)
+{
+	usb_device_request_t req;
+	usbd_status err;
+
+	req.bmRequestType = UT_VENDOR;
+	req.bRequest = UMSM_SET_POWER_REQUEST;
+	USETW(req.wValue, UMSM_POWER_MODE_D0);
+	USETW(req.wIndex, 0);
+	USETW(req.wLength, 0);
+
+	err = usbd_do_request(dev, &req, 0);
+	if (err)
 		return (EIO);
 
 	return (0);