USB: EHCI Debug Port Device Gadget
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From: Geert Uytterhoeven on 12 Aug 2010 17:40 On Wed, Aug 11, 2010 at 01:00, Linux Kernel Mailing List <linux-kernel(a)vger.kernel.org> wrote: > Gitweb:   http://git.kernel.org/linus/f6c826a90055dd05905982f7a3f60e0bcaa0434e >   USB: EHCI Debug Port Device Gadget > diff --git a/drivers/usb/gadget/dbgp.c b/drivers/usb/gadget/dbgp.c > new file mode 100644 > index 0000000..0ed50a2 > --- /dev/null > +++ b/drivers/usb/gadget/dbgp.c > +static int dbgp_setup(struct usb_gadget *gadget, > +           const struct usb_ctrlrequest *ctrl) > +{ > +    struct usb_request *req = dbgp.req; > +    u8 request = ctrl->bRequest; > +    u16 value = le16_to_cpu(ctrl->wValue); > +    u16 length = le16_to_cpu(ctrl->wLength); > +    int err = 0; > +    void *data; > +    u16 len; > + > +    gadget->ep0->driver_data = gadget; > + > +    if (request == USB_REQ_GET_DESCRIPTOR) { > +        switch (value>>8) { > +        case USB_DT_DEVICE: > +            dev_dbg(&dbgp.gadget->dev, "setup: desc device\n"); > +            len = sizeof device_desc; > +            data = &device_desc; > +            break; > +        case USB_DT_DEBUG: > +            dev_dbg(&dbgp.gadget->dev, "setup: desc debug\n"); > +            len = sizeof dbg_desc; > +            data = &dbg_desc; > +            break; > +        default: > +            goto fail; > +        } > +    } else if (request == USB_REQ_SET_FEATURE && > +          value == USB_DEVICE_DEBUG_MODE) { > +        len = 0; > +        data = NULL; > +        dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n"); > +#ifdef CONFIG_USB_G_DBGP_PRINTK > +        err = dbgp_enable_ep(); > +#else > +        err = gserial_connect(dbgp.serial, 0); > +#endif > +        if (err < 0) > +            goto fail; > +    } else > +        goto fail; > + > +    if (len >= 0) { warning: comparison is always true due to limited range of data type len is u16. Perhaps the test was intended to be `(len > 0)'? > +        req->length = min(length, len); > +        req->zero = len < req->length; > +        if (data && req->length) > +            memcpy(req->buf, data, req->length); > + > +        req->complete = dbgp_setup_complete; > +        return usb_ep_queue(gadget->ep0, req, GFP_ATOMIC); > +    } > + > +fail: > +    dev_dbg(&dbgp.gadget->dev, > +        "setup: failure req %x v %x\n", request, value); > +    return err; > +} > + > +static struct usb_gadget_driver dbgp_driver = { > +    .function = "dbgp", > +    .speed = USB_SPEED_HIGH, > +    .bind = dbgp_bind, > +    .unbind = dbgp_unbind, > +    .setup = dbgp_setup, > +    .disconnect = dbgp_disconnect, > +    .driver = { > +        .owner = THIS_MODULE, > +        .name = "dbgp" > +    }, > +}; > + > +static int __init dbgp_init(void) > +{ > +    return usb_gadget_register_driver(&dbgp_driver); > +} > + > +static void __exit dbgp_exit(void) > +{ > +    usb_gadget_unregister_driver(&dbgp_driver); > +#ifdef CONFIG_USB_G_DBGP_SERIAL > +    gserial_cleanup(); > +#endif > +} > + > +MODULE_AUTHOR("Stephane Duverger"); > +MODULE_LICENSE("GPL"); > +module_init(dbgp_init); > +module_exit(dbgp_exit); > -- > To unsubscribe from this list: send the line "unsubscribe git-commits-head" in > the body of a message to majordomo(a)vger.kernel.org > More majordomo info at  http://vger.kernel.org/majordomo-info.html > -- Gr{oetje,eeting}s,             Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert(a)linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that.                  -- Linus Torvalds |