freebsd-dev/sys/dev/usb/ucycom.c

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/*-
* Copyright (c) 2004 Dag-Erling Co<EFBFBD>dan Sm<EFBFBD>rgrav
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* Device driver for Cypress CY7C637xx and CY7C640/1xx series USB to
* RS232 bridges.
*
* Normally, a driver for a USB-to-serial chip would hang off the ucom(4)
* driver, but ucom(4) was written under the assumption that all USB-to-
* serial chips use bulk pipes for I/O, while the Cypress parts use HID
* reports.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include <sys/bus.h>
#include <sys/tty.h>
#include "usbdevs.h"
#include <dev/usb/usb.h>
#include <dev/usb/usb_port.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#include <dev/usb/usbhid.h>
#include <dev/usb/hid.h>
#define UCYCOM_EP_INPUT 0
#define UCYCOM_EP_OUTPUT 1
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#define UCYCOM_MAX_IOLEN 32U
struct ucycom_softc {
device_t sc_dev;
struct tty *sc_tty;
int sc_error;
unsigned long sc_cintr;
unsigned long sc_cin;
unsigned long sc_clost;
unsigned long sc_cout;
/* usb parameters */
usbd_device_handle sc_usbdev;
usbd_interface_handle sc_iface;
usbd_pipe_handle sc_pipe;
uint8_t sc_iep; /* input endpoint */
uint8_t sc_fid; /* feature report id*/
uint8_t sc_iid; /* input report id */
uint8_t sc_oid; /* output report id */
size_t sc_flen; /* feature report length */
size_t sc_ilen; /* input report length */
size_t sc_olen; /* output report length */
uint8_t sc_ibuf[UCYCOM_MAX_IOLEN];
/* model and settings */
uint32_t sc_model;
#define MODEL_CY7C63743 0x63743
#define MODEL_CY7C64013 0x64013
uint32_t sc_baud;
uint8_t sc_cfg;
#define UCYCOM_CFG_RESET 0x80
#define UCYCOM_CFG_PARODD 0x20
#define UCYCOM_CFG_PAREN 0x10
#define UCYCOM_CFG_STOPB 0x08
#define UCYCOM_CFG_DATAB 0x03
uint8_t sc_ist; /* status flags from last input */
uint8_t sc_ost; /* status flags for next output */
/* flags */
char sc_dying;
};
static int ucycom_probe(device_t);
static int ucycom_attach(device_t);
static int ucycom_detach(device_t);
static t_open_t ucycom_open;
static t_close_t ucycom_close;
static void ucycom_start(struct tty *);
static void ucycom_stop(struct tty *, int);
static int ucycom_param(struct tty *, struct termios *);
static int ucycom_configure(struct ucycom_softc *, uint32_t, uint8_t);
static void ucycom_intr(usbd_xfer_handle, usbd_private_handle, usbd_status);
static device_method_t ucycom_methods[] = {
DEVMETHOD(device_probe, ucycom_probe),
DEVMETHOD(device_attach, ucycom_attach),
DEVMETHOD(device_detach, ucycom_detach),
{ 0, 0 }
};
static driver_t ucycom_driver = {
"ucycom",
ucycom_methods,
sizeof(struct ucycom_softc),
};
static devclass_t ucycom_devclass;
DRIVER_MODULE(ucycom, uhub, ucycom_driver, ucycom_devclass, usbd_driver_load, 0);
MODULE_VERSION(ucycom, 1);
MODULE_DEPEND(ucycom, usb, 1, 1, 1);
/*
* Supported devices
*/
static struct ucycom_device {
uint16_t vendor;
uint16_t product;
uint32_t model;
} ucycom_devices[] = {
{ USB_VENDOR_DELORME, USB_PRODUCT_DELORME_EARTHMATE, MODEL_CY7C64013 },
{ 0, 0, 0 },
};
#define UCYCOM_DEFAULT_RATE 4800
#define UCYCOM_DEFAULT_CFG 0x03 /* N-8-1 */
/*****************************************************************************
*
* Driver interface
*
*/
static int
ucycom_probe(device_t dev)
{
struct usb_attach_arg *uaa;
struct ucycom_device *ud;
uaa = device_get_ivars(dev);
if (uaa->iface != NULL)
return (UMATCH_NONE);
for (ud = ucycom_devices; ud->model != 0; ++ud)
if (ud->vendor == uaa->vendor && ud->product == uaa->product)
return (UMATCH_VENDOR_PRODUCT);
return (UMATCH_NONE);
}
static int
ucycom_attach(device_t dev)
{
struct usb_attach_arg *uaa;
struct ucycom_softc *sc;
struct ucycom_device *ud;
usb_endpoint_descriptor_t *ued;
char *devinfo;
void *urd;
int error, urdlen;
/* get arguments and softc */
uaa = device_get_ivars(dev);
sc = device_get_softc(dev);
bzero(sc, sizeof *sc);
sc->sc_dev = dev;
sc->sc_usbdev = uaa->device;
/* get device description */
/* XXX usb_devinfo() has little or no overflow protection */
devinfo = malloc(1024, M_USBDEV, M_WAITOK);
usbd_devinfo(sc->sc_usbdev, 0, devinfo);
device_set_desc_copy(dev, devinfo);
device_printf(dev, "%s\n", devinfo);
free(devinfo, M_USBDEV);
/* get chip model */
for (ud = ucycom_devices; ud->model != 0; ++ud)
if (ud->vendor == uaa->vendor && ud->product == uaa->product)
sc->sc_model = ud->model;
if (sc->sc_model == 0) {
device_printf(dev, "unsupported device\n");
return (ENXIO);
}
device_printf(dev, "Cypress CY7C%X USB to RS232 bridge\n", sc->sc_model);
/* select configuration */
error = usbd_set_config_index(sc->sc_usbdev, 0, 1 /* verbose */);
if (error != 0) {
device_printf(dev, "failed to select configuration: %s\n",
usbd_errstr(error));
return (ENXIO);
}
/* get first interface handle */
error = usbd_device2interface_handle(sc->sc_usbdev, 0, &sc->sc_iface);
if (error != 0) {
device_printf(dev, "failed to get interface handle: %s\n",
usbd_errstr(error));
return (ENXIO);
}
/* get report descriptor */
error = usbd_read_report_desc(sc->sc_iface, &urd, &urdlen, M_USBDEV);
if (error != 0) {
device_printf(dev, "failed to get report descriptor: %s\n",
usbd_errstr(error));
return (ENXIO);
}
/* get report sizes */
sc->sc_flen = hid_report_size(urd, urdlen, hid_feature, &sc->sc_fid);
sc->sc_ilen = hid_report_size(urd, urdlen, hid_input, &sc->sc_iid);
sc->sc_olen = hid_report_size(urd, urdlen, hid_output, &sc->sc_oid);
if (sc->sc_ilen > UCYCOM_MAX_IOLEN || sc->sc_olen > UCYCOM_MAX_IOLEN) {
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device_printf(dev, "I/O report size too big (%zu, %zu, %u)\n",
sc->sc_ilen, sc->sc_olen, UCYCOM_MAX_IOLEN);
return (ENXIO);
}
/* get and verify input endpoint descriptor */
ued = usbd_interface2endpoint_descriptor(sc->sc_iface, UCYCOM_EP_INPUT);
if (ued == NULL) {
device_printf(dev, "failed to get input endpoint descriptor\n");
return (ENXIO);
}
if (UE_GET_DIR(ued->bEndpointAddress) != UE_DIR_IN) {
device_printf(dev, "not an input endpoint\n");
return (ENXIO);
}
if ((ued->bmAttributes & UE_XFERTYPE) != UE_INTERRUPT) {
device_printf(dev, "not an interrupt endpoint\n");
return (ENXIO);
}
sc->sc_iep = ued->bEndpointAddress;
/* set up tty */
sc->sc_tty = ttyalloc();
sc->sc_tty->t_sc = sc;
sc->sc_tty->t_oproc = ucycom_start;
sc->sc_tty->t_stop = ucycom_stop;
sc->sc_tty->t_param = ucycom_param;
sc->sc_tty->t_open = ucycom_open;
sc->sc_tty->t_close = ucycom_close;
SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
OID_AUTO, "intr", CTLFLAG_RD, &sc->sc_cintr, 0,
"interrupt count");
SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
OID_AUTO, "in", CTLFLAG_RD, &sc->sc_cin, 0,
"input bytes read");
SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
OID_AUTO, "lost", CTLFLAG_RD, &sc->sc_clost, 0,
"input bytes lost");
SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
OID_AUTO, "out", CTLFLAG_RD, &sc->sc_cout, 0,
"output bytes");
/* create character device node */
ttycreate(sc->sc_tty, NULL, 0, 0, "y%r", device_get_unit(sc->sc_dev));
return (0);
}
static int
ucycom_detach(device_t dev)
{
struct ucycom_softc *sc;
sc = device_get_softc(dev);
ttyfree(sc->sc_tty);
return (0);
}
/*****************************************************************************
*
* Device interface
*
*/
static int
ucycom_open(struct tty *tp, struct cdev *cdev)
{
struct ucycom_softc *sc = tp->t_sc;
int error;
/* set default configuration */
ucycom_configure(sc, UCYCOM_DEFAULT_RATE, UCYCOM_DEFAULT_CFG);
/* open interrupt pipe */
error = usbd_open_pipe_intr(sc->sc_iface, sc->sc_iep, 0,
&sc->sc_pipe, sc, sc->sc_ibuf, sc->sc_ilen,
ucycom_intr, USBD_DEFAULT_INTERVAL);
if (error != 0) {
device_printf(sc->sc_dev, "failed to open interrupt pipe: %s\n",
usbd_errstr(error));
return (ENXIO);
}
if (bootverbose)
device_printf(sc->sc_dev, "%s bypass l_rint()\n",
(sc->sc_tty->t_state & TS_CAN_BYPASS_L_RINT) ?
"can" : "can't");
/* done! */
return (0);
}
static void
ucycom_close(struct tty *tp)
{
struct ucycom_softc *sc = tp->t_sc;
/* stop interrupts and close the interrupt pipe */
usbd_abort_pipe(sc->sc_pipe);
usbd_close_pipe(sc->sc_pipe);
sc->sc_pipe = 0;
return;
}
/*****************************************************************************
*
* TTY interface
*
*/
static void
ucycom_start(struct tty *tty)
{
struct ucycom_softc *sc = tty->t_sc;
uint8_t report[sc->sc_olen];
int error, len;
while (sc->sc_error == 0 && sc->sc_tty->t_outq.c_cc > 0) {
switch (sc->sc_model) {
case MODEL_CY7C63743:
len = q_to_b(&sc->sc_tty->t_outq,
report + 1, sc->sc_olen - 1);
sc->sc_cout += len;
report[0] = len;
len += 1;
break;
case MODEL_CY7C64013:
len = q_to_b(&sc->sc_tty->t_outq,
report + 2, sc->sc_olen - 2);
sc->sc_cout += len;
report[0] = 0;
report[1] = len;
len += 2;
break;
default:
panic("unsupported model (driver error)");
}
while (len < sc->sc_olen)
report[len++] = 0;
error = usbd_set_report(sc->sc_iface, UHID_OUTPUT_REPORT,
sc->sc_oid, report, sc->sc_olen);
#if 0
if (error != 0) {
device_printf(sc->sc_dev,
"failed to set output report: %s\n",
usbd_errstr(error));
sc->sc_error = error;
}
#endif
}
}
static void
ucycom_stop(struct tty *tty, int flags)
{
struct ucycom_softc *sc;
sc = tty->t_sc;
if (bootverbose)
device_printf(sc->sc_dev, "%s()\n", __func__);
}
static int
ucycom_param(struct tty *tty, struct termios *t)
{
struct ucycom_softc *sc;
uint32_t baud;
uint8_t cfg;
int error;
sc = tty->t_sc;
if (t->c_ispeed != t->c_ospeed)
return (EINVAL);
baud = t->c_ispeed;
if (t->c_cflag & CIGNORE) {
cfg = sc->sc_cfg;
} else {
cfg = 0;
switch (t->c_cflag & CSIZE) {
case CS8:
++cfg;
case CS7:
++cfg;
case CS6:
++cfg;
case CS5:
break;
default:
return (EINVAL);
}
if (t->c_cflag & CSTOPB)
cfg |= UCYCOM_CFG_STOPB;
if (t->c_cflag & PARENB)
cfg |= UCYCOM_CFG_PAREN;
if (t->c_cflag & PARODD)
cfg |= UCYCOM_CFG_PARODD;
}
error = ucycom_configure(sc, baud, cfg);
return (error);
}
/*****************************************************************************
*
* Hardware interface
*
*/
static int
ucycom_configure(struct ucycom_softc *sc, uint32_t baud, uint8_t cfg)
{
uint8_t report[sc->sc_flen];
int error;
switch (baud) {
case 600:
case 1200:
case 2400:
case 4800:
case 9600:
case 19200:
case 38400:
case 57600:
#if 0
/*
* Stock chips only support standard baud rates in the 600 - 57600
* range, but higher rates can be achieved using custom firmware.
*/
case 115200:
case 153600:
case 192000:
#endif
break;
default:
return (EINVAL);
}
if (bootverbose)
device_printf(sc->sc_dev, "%d baud, %c-%d-%d\n", baud,
(cfg & UCYCOM_CFG_PAREN) ?
((cfg & UCYCOM_CFG_PARODD) ? 'O' : 'E') : 'N',
5 + (cfg & UCYCOM_CFG_DATAB),
(cfg & UCYCOM_CFG_STOPB) ? 2 : 1);
report[0] = baud & 0xff;
report[1] = (baud >> 8) & 0xff;
report[2] = (baud >> 16) & 0xff;
report[3] = (baud >> 24) & 0xff;
report[4] = cfg;
error = usbd_set_report(sc->sc_iface, UHID_FEATURE_REPORT,
sc->sc_fid, report, sc->sc_flen);
if (error != 0) {
device_printf(sc->sc_dev, "%s\n", usbd_errstr(error));
return (EIO);
}
sc->sc_baud = baud;
sc->sc_cfg = cfg;
return (0);
}
static void
ucycom_intr(usbd_xfer_handle xfer, usbd_private_handle scp, usbd_status status)
{
struct ucycom_softc *sc = scp;
uint8_t *data;
int i, len, lost;
sc->sc_cintr++;
switch (sc->sc_model) {
case MODEL_CY7C63743:
sc->sc_ist = sc->sc_ibuf[0] & ~0x07;
len = sc->sc_ibuf[0] & 0x07;
data = sc->sc_ibuf + 1;
break;
case MODEL_CY7C64013:
sc->sc_ist = sc->sc_ibuf[0] & ~0x07;
len = sc->sc_ibuf[1];
data = sc->sc_ibuf + 2;
break;
default:
panic("unsupported model (driver error)");
}
switch (status) {
case USBD_NORMAL_COMPLETION:
break;
default:
/* XXX */
return;
}
if (sc->sc_tty->t_state & TS_CAN_BYPASS_L_RINT) {
/* XXX flow control! */
lost = b_to_q(data, len, &sc->sc_tty->t_rawq);
sc->sc_tty->t_rawcc += len - lost;
ttwakeup(sc->sc_tty);
} else {
for (i = 0, lost = len; i < len; ++i, --lost)
if (ttyld_rint(sc->sc_tty, data[i]) != 0)
break;
}
sc->sc_cin += len - lost;
sc->sc_clost += lost;
}