[RFC PATCH] gnss: usb: add support for U-Blox NEO-M9N

[Peter Robinson <pbrobinson@gmail.com>]

Add support for the USB interface of the SparkFun NEO-M9N
GPS Breakout receiver.

Bus 001 Device 005: ID 1546:01a9 U-Blox AG u-blox GNSS receiver
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            2 Communications
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x1546 U-Blox AG
  idProduct          0x01a9
  bcdDevice            4.04
  iManufacturer           1 u-blox AG - www.u-blox.com
  iProduct                2 u-blox GNSS receiver
  iSerial                 0
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x003e
    bNumInterfaces          2
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xc0
      Self Powered
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         2 Communications
      bInterfaceSubClass      2 Abstract (modem)
      bInterfaceProtocol      1 AT-commands (v.25ter)
      iInterface              0
      CDC Header:
        bcdCDC               1.10
      CDC ACM:
        bmCapabilities       0x02
          line coding and serial state
      CDC Call Management:
        bmCapabilities       0x03
          call management
          use DataInterface
        bDataInterface          1
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x83  EP 3 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval             255
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass        10 CDC Data
      bInterfaceSubClass      0
      bInterfaceProtocol    255 Vendor specific
      iInterface              0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
Device Status:     0x0001
  Self Powered

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Cc: Johan Hovold <johan@kernel.org>
---
Hi Johan,

I've tested your GNSS USB series with a pair of U-Blox devices, adding
the above USB ID. Only one included here for feedback to guage your thoughts.
By defauly The U-Blox devices enumerate with the CDC ACM driver and output
NMEA data via /dev/ttyACM0. With this patch and cdc_acm blocked I get
/dev/gnss0 and can cat it to get NMEA data. Is your expectation to move
these sort of devices over to the usb gnss driver too?

Peter

 drivers/gnss/usb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gnss/usb.c b/drivers/gnss/usb.c
index 792235a688ea..775d58c2dbe1 100644
--- a/drivers/gnss/usb.c
+++ b/drivers/gnss/usb.c
@@ -18,6 +18,7 @@
 
 static const struct usb_device_id gnss_usb_id_table[] = {
 	{ USB_DEVICE(0x1199, 0xb000) },		/* Sierra Wireless XM1210 */
+	{ USB_DEVICE(0x1546, 0x01a9) },		/* U-Blox NEO-M9N GNSS receiver */
 	{ }
 };
 MODULE_DEVICE_TABLE(usb, gnss_usb_id_table);
-- 
2.33.1