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Thu, 30 Oct 2025 02:01:18 -0700 (PDT) From: Oleksandr Suvorov To: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold , Greg Kroah-Hartman Cc: Oleksandr Suvorov Subject: [PATCH v2] usb: serial: ftdi_sio: add support for u-blox EVK-M101 Date: Thu, 30 Oct 2025 11:00:15 +0200 Message-ID: <20251030090056.3175217-1-cryosay@gmail.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The U-Blox EVK-M101 enumerates as 1546:0506 [1] with four FTDI interfaces: - EVK-M101 current sensors - EVK-M101 I2C - EVK-M101 UART - EVK-M101 port D Only the third USB interface is a UART. This change lets ftdi_sio probe the VID/PID and registers only interface #3 as a TTY, leaving the rest available for other drivers. [1] usb 5-1.3: new high-speed USB device number 11 using xhci_hcd usb 5-1.3: New USB device found, idVendor=3D1546, idProduct=3D0506, bcdDevi= ce=3D 8.00 usb 5-1.3: New USB device strings: Mfr=3D1, Product=3D2, SerialNumber=3D0 usb 5-1.3: Product: EVK-M101 usb 5-1.3: Manufacturer: u-blox AG Datasheet: https://content.u-blox.com/sites/default/files/documents/EVK-M10= _UserGuide_UBX-21003949.pdf Link: https://lore.kernel.org/r/20250926060235.3442748-1-cryosay@gmail.com Signed-off-by: Oleksandr Suvorov --- v2: - Restrict probing to interface #3 only - Add a device model to commit message - Fix grammar in commit message - Add Link: to v1 --- drivers/usb/serial/ftdi_sio.c | 25 +++++++++++++++++++++++++ drivers/usb/serial/ftdi_sio_ids.h | 1 + 2 files changed, 26 insertions(+) diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index 49666c33b41f..4902b496d6de 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -110,6 +110,7 @@ static int ftdi_jtag_probe(struct usb_serial *serial); static int ftdi_NDI_device_setup(struct usb_serial *serial); static int ftdi_stmclite_probe(struct usb_serial *serial); static int ftdi_8u2232c_probe(struct usb_serial *serial); +static int ftdi_evkm101_probe(struct usb_serial *serial); static void ftdi_USB_UIRT_setup(struct ftdi_private *priv); static void ftdi_HE_TIRA1_setup(struct ftdi_private *priv); =20 @@ -137,6 +138,10 @@ static const struct ftdi_quirk ftdi_8u2232c_quirk =3D { .probe =3D ftdi_8u2232c_probe, }; =20 +static const struct ftdi_quirk ftdi_evkm101_quirk =3D { + .probe =3D ftdi_evkm101_probe, +}; + /* * The 8U232AM has the same API as the sio except for: * - it can support MUCH higher baudrates; up to: @@ -1074,6 +1079,8 @@ static const struct usb_device_id id_table_combined[]= =3D { /* U-Blox devices */ { USB_DEVICE(UBLOX_VID, UBLOX_C099F9P_ZED_PID) }, { USB_DEVICE(UBLOX_VID, UBLOX_C099F9P_ODIN_PID) }, + { USB_DEVICE(UBLOX_VID, UBLOX_EVK_M101_PID), + .driver_info =3D (kernel_ulong_t)&ftdi_evkm101_quirk }, /* FreeCalypso USB adapters */ { USB_DEVICE(FTDI_VID, FTDI_FALCONIA_JTAG_BUF_PID), .driver_info =3D (kernel_ulong_t)&ftdi_jtag_quirk }, @@ -2362,6 +2369,24 @@ static int ftdi_stmclite_probe(struct usb_serial *se= rial) return 0; } =20 +/* + * 1st, 2nd and 4th ports on U-Blox EVK-M101 using an FTDI FT4232H USB-to-= UART + * are reserved for non-UART interfaces. The only 3rd port can be used as = UART. + */ +static int ftdi_evkm101_probe(struct usb_serial *serial) +{ + struct usb_interface *intf =3D serial->interface; + int ifnum =3D intf->cur_altsetting->desc.bInterfaceNumber; + + if (ifnum !=3D 2) { + dev_info(&intf->dev, + "Ignoring interface reserved as non-UART\n"); + return -ENODEV; + } + + return 0; +} + static void ftdi_port_remove(struct usb_serial_port *port) { struct ftdi_private *priv =3D usb_get_serial_port_data(port); diff --git a/drivers/usb/serial/ftdi_sio_ids.h b/drivers/usb/serial/ftdi_si= o_ids.h index 4cc1fae8acb9..2539b9e2f712 100644 --- a/drivers/usb/serial/ftdi_sio_ids.h +++ b/drivers/usb/serial/ftdi_sio_ids.h @@ -1614,6 +1614,7 @@ #define UBLOX_VID 0x1546 #define UBLOX_C099F9P_ZED_PID 0x0502 #define UBLOX_C099F9P_ODIN_PID 0x0503 +#define UBLOX_EVK_M101_PID 0x0506 =20 /* * GMC devices --=20 2.48.1