This patch adds custom IOCTLs to read and write the 4 GPIO pins on the
cp2103 usb-to-serial chip. Time from IOCTL to actual pin change is
pretty slow though.
Index: serial/uslcom.c
===================================================================
--- serial/uslcom.c     (revision 227453)
+++ serial/uslcom.c     (working copy)
@@ -42,6 +42,7 @@
 #include <dev/usb/usbdi.h>
 #include <dev/usb/usbdi_util.h>
 #include "usbdevs.h"
+#include <dev/usb/usb_ioctl.h>
 
 #define        USB_DEBUG_VAR uslcom_debug
 #include <dev/usb/usb_debug.h>
@@ -75,6 +76,7 @@
 #define        USLCOM_CTRL             0x07
 #define        USLCOM_RCTRL            0x08
 #define        USLCOM_SET_FLOWCTRL     0x13
+#define        USLCOM_VENDOR_SPECIFIC  0xff
 
 /* USLCOM_UART values */
 #define        USLCOM_UART_DISABLE     0x00
@@ -113,6 +115,10 @@
 #define        USLCOM_FLOW_RTS_ON      0x00000040 /* RTS static active */
 #define        USLCOM_FLOW_RTS_HS      0x00000080 /* RTS handshake */
 
+/* USLCOM_VENDOR_SPECIFIC values */
+#define        USLCOM_WRITE_LATCH      0x37E1
+#define        USLCOM_READ_LATCH       0x00C2
+
 enum {
        USLCOM_BULK_DT_WR,
        USLCOM_BULK_DT_RD,
@@ -145,6 +151,8 @@
 static void uslcom_set_dtr(struct ucom_softc *, uint8_t);
 static void uslcom_set_rts(struct ucom_softc *, uint8_t);
 static void uslcom_set_break(struct ucom_softc *, uint8_t);
+static int uslcom_ioctl(struct ucom_softc *, uint32_t, caddr_t, int,
+               struct thread *);
 static int uslcom_pre_param(struct ucom_softc *, struct termios *);
 static void uslcom_param(struct ucom_softc *, struct termios *);
 static void uslcom_get_status(struct ucom_softc *, uint8_t *, uint8_t *);
@@ -192,6 +200,7 @@
        .ucom_cfg_set_dtr = &uslcom_set_dtr,
        .ucom_cfg_set_rts = &uslcom_set_rts,
        .ucom_cfg_set_break = &uslcom_set_break,
+       .ucom_ioctl = &uslcom_ioctl,
        .ucom_cfg_param = &uslcom_param,
        .ucom_pre_param = &uslcom_pre_param,
        .ucom_start_read = &uslcom_start_read,
@@ -591,6 +600,57 @@
        }
 }
 
+static int
+uslcom_ioctl(struct ucom_softc *ucom, uint32_t cmd, caddr_t data,
+    int flag, struct thread *td)
+{
+       struct uslcom_softc *sc = ucom->sc_parent;
+       struct usb_device_request req;
+       int error = 0;
+       uint8_t latch;
+
+       DPRINTF("cmd=0x%08x\n", cmd);
+
+       switch (cmd) {
+
+       case USB_GET_GPIO:
+               req.bmRequestType = USLCOM_READ;
+               req.bRequest = USLCOM_VENDOR_SPECIFIC;
+               USETW(req.wValue, USLCOM_READ_LATCH);
+               USETW(req.wIndex, 0);
+               USETW(req.wLength, sizeof(latch));
+
+               if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom, 
+                   &req, &latch, 0, 1000)) {
+                       DPRINTF("Get LATCH failed\n");
+                       error = EIO;
+               }
+               *(uint8_t *)data = latch;
+               break;
+
+       case USB_SET_GPIO:
+               req.bmRequestType = USLCOM_WRITE;
+               req.bRequest = USLCOM_VENDOR_SPECIFIC;
+               USETW(req.wValue, USLCOM_WRITE_LATCH);
+               USETW(req.wIndex, (*(uint16_t *)data));
+               USETW(req.wLength, 0);
+               
+               if (ucom_cfg_do_request(sc->sc_udev, &sc->sc_ucom, 
+                   &req, NULL, 0, 1000)) {
+                       DPRINTF("Set LATCH failed\n");
+                       error = EIO;
+               }
+               break;
+
+       default:
+               DPRINTF("unknown\n");
+               error = ENOIOCTL;
+               break;
+       }
+
+       return (error);
+}
+
 static void
 uslcom_write_callback(struct usb_xfer *xfer, usb_error_t error)
 {
Index: usb_ioctl.h
===================================================================
--- usb_ioctl.h (revision 227453)
+++ usb_ioctl.h (working copy)
@@ -289,6 +289,10 @@
 #define        USB_GET_CM_OVER_DATA    _IOR ('U', 180, int)
 #define        USB_SET_CM_OVER_DATA    _IOW ('U', 181, int)
 
+/* GPIO control */
+#define        USB_GET_GPIO            _IOR ('U', 182, int)
+#define        USB_SET_GPIO            _IOW ('U', 183, int)
+
 /* USB file system interface */
 #define        USB_FS_START            _IOW ('U', 192, struct usb_fs_start)
 #define        USB_FS_STOP             _IOW ('U', 193, struct usb_fs_stop)
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