linux-kernel - Re: [PATCH v2] USB: Serial: cypress_M8: Enable Simply Automated UPB PIM

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Date:   Tue, 23 Jun 2020 09:53:48 +0200
From:   Johan Hovold <johan@...nel.org>
To:     James Hilliard <james.hilliard1@...il.com>
Cc:     Johan Hovold <johan@...nel.org>, linux-usb@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v2] USB: Serial: cypress_M8: Enable Simply Automated UPB
 PIM

On Mon, Jun 22, 2020 at 11:04:09AM -0600, James Hilliard wrote:
> On Mon, Jun 22, 2020 at 2:53 AM Johan Hovold <johan@...nel.org> wrote:
> >
> > On Tue, Jun 16, 2020 at 04:04:03PM -0600, James Hilliard wrote:
> > > This is a UPB(Universal Powerline Bus) PIM(Powerline Interface Module)
> > > which allows for controlling multiple UPB compatible devices from
> > > Linux using the standard serial interface.
> > >
> > > Based on vendor application source code there are two different models
> > > of USB based PIM devices in addition to a number of RS232 based PIM's.
> > >
> > > The vendor UPB application source contains the following USB ID's:
> > > #define USB_PCS_VENDOR_ID 0x04b4
> > > #define USB_PCS_PIM_PRODUCT_ID 0x5500
> > >
> > > #define USB_SAI_VENDOR_ID 0x17dd
> > > #define USB_SAI_PIM_PRODUCT_ID 0x5500
> > >
> > > The first set of ID's correspond to the PIM variant sold by Powerline
> > > Control Systems while the second corresponds to the Simply Automated
> > > Incorporated PIM. As the product ID for both of these match the default
> > > cypress HID->COM RS232 product ID it assumed that they both use an
> > > internal variant of this HID->COM RS232 converter hardware. However
> > > as the vendor ID for the Simply Automated variant is different we need
> > > to also add it to the cypress_M8 driver so that it is properly
> > > detected.
> > >
> > > Signed-off-by: James Hilliard <james.hilliard1@...il.com>
> > > ---
> > > Changes v1 -> v2:
> > >   - Add more detailed commit message.
> >
> > Now applied, thanks.
> >
> > Would you mind posting the output of "lsusb -v" for this device for
> > completeness?
> Bus 001 Device 004: ID 17dd:5500
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               1.00
>   bDeviceClass            0
>   bDeviceSubClass         0
>   bDeviceProtocol         0
>   bMaxPacketSize0         8
>   idVendor           0x17dd
>   idProduct          0x5500
>   bcdDevice            0.00
>   iManufacturer           1 Simply Automated Inc.
>   iProduct                2 USB to Serial
>   iSerial                 0
>   bNumConfigurations      1
>   Configuration Descriptor:
>     bLength                 9
>     bDescriptorType         2
>     wTotalLength       0x0029
>     bNumInterfaces          1
>     bConfigurationValue     1
>     iConfiguration          4 Sample HID
>     bmAttributes         0x80
>       (Bus Powered)
>     MaxPower              100mA
>     Interface Descriptor:
>       bLength                 9
>       bDescriptorType         4
>       bInterfaceNumber        0
>       bAlternateSetting       0
>       bNumEndpoints           2
>       bInterfaceClass         3
>       bInterfaceSubClass      0
>       bInterfaceProtocol      0
>       iInterface              0
>         HID Device Descriptor:
>           bLength                 9
>           bDescriptorType        33
>           bcdHID               1.00
>           bCountryCode            0 Not supported
>           bNumDescriptors         1
>           bDescriptorType        34 Report
>           wDescriptorLength      37
>          Report Descriptors:
>            ** UNAVAILABLE **

Thanks for posting this.

Don't you need to add this device to the HID driver's ignore list
to prevent it from claiming the device (see hid_ignore_list) just like
for the Cypress VID?

Johan