diff mbox series

CR for ftdi_sio.c, SCS P4 Dragon

Message ID b7ec696f-c5ca-30e6-0769-4c6e925e8367@woltersonline.net
State New
Headers show
Series CR for ftdi_sio.c, SCS P4 Dragon | expand

Commit Message

Robert Wolters May 3, 2021, 7:45 p.m. UTC 
Dear Johan,

I'd like to submit a small change request for the ftdi_sio.c Kernel module.

Problem: setting a special Baud-rate for the SCS P4 Dragon series 
(Pactor 4) of short-wave modems.

Solution: as implemented in the patch file attached. This change has 
been tested on several Debian-based machines, and works okay. Which is 
not a surprise, as only the Baud-rate is set, using a specific divisor, 
in a same manner as is already done for other devices currently 
supported by ftdi_sio.

I'm also submitting this change request on behalf of SCS GmbH & Co KG of 
Hanau in Germany.

Many thanks in advance. Looking forward to any feedback and/or comments.

Regards,
Robert Wolters (DM4RW)

Südstrasse 4b
82131 Stockdorf (nr Munich)
Germany
diff mbox series

Patch

--- ftdi_sio.c  2021-04-21 13:01:00.000000000 +0200
+++ ftdi_sio_new.c      2021-04-26 18:53:00.819175707 +0200
@@ -97,6 +97,7 @@ 
 static int   ftdi_8u2232c_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);
+static void  ftdi_SCS_DR7X00_setup(struct ftdi_private *priv);
 
 static const struct ftdi_sio_quirk ftdi_jtag_quirk = {
        .probe  = ftdi_jtag_probe,
@@ -122,6 +123,10 @@ 
        .probe  = ftdi_8u2232c_probe,
 };
 
+static const struct ftdi_sio_quirk ftdi_SCS_DR7X00_quirk = {
+       .port_probe = ftdi_SCS_DR7X00_setup,
+};
+
 /*
  * The 8U232AM has the same API as the sio except for:
  * - it can support MUCH higher baudrates; up to:
@@ -157,8 +162,12 @@ 
        { USB_DEVICE(FTDI_VID, FTDI_EV3CON_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_0_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_1_PID) },
-       { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_2_PID) },
-       { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_3_PID) },
+/*     { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_2_PID) },
+       { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_3_PID) },*/
+       { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_2_PID) ,
+               .driver_info = (kernel_ulong_t)&ftdi_SCS_DR7X00_quirk },
+       { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_3_PID) ,
+               .driver_info = (kernel_ulong_t)&ftdi_SCS_DR7X00_quirk },
        { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_4_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_5_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_SCS_DEVICE_6_PID) },
@@ -2296,6 +2305,15 @@ 
        priv->force_rtscts = 1;
 }
 
+/* Setup for the SCS P4dragon DR-7X00 devices, which require hardwired
+ * baudrate of 829440 (38400 gets mapped to 829440) */
+static void ftdi_SCS_DR7X00_setup(struct ftdi_private *priv)
+{
+       priv->flags |= ASYNC_SPD_CUST;
+       priv->custom_divisor = 29;
+       priv->force_baud = 38400;
+}
+
 /*
  * Module parameter to control latency timer for NDI FTDI-based USB devices.
  * If this value is not set in /etc/modprobe.d/ its value will be set