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uchcom(4): add CH343 support
Hi,
The following diff adds support for WCH CH343 uart.
With this diff, I was able to access serial data on /dev/cuaU0 via the CH343.
Tested:
uchcom0 at uhub0 port 8 configuration 1 interface 0 "QinHeng Electronics USB Single Serial" rev 1.10/4.45 addr 2
uchcom0: CH343
ucom0 at uchcom0: usb0.0.00008.1
ok?
Index: share/man/man4/uchcom.4
===================================================================
RCS file: /cvs/src/share/man/man4/uchcom.4,v
retrieving revision 1.2
diff -u -p -u -p -r1.2 uchcom.4
--- share/man/man4/uchcom.4 16 Jul 2013 16:05:49 -0000 1.2
+++ share/man/man4/uchcom.4 11 Apr 2024 05:35:56 -0000
@@ -19,14 +19,18 @@
.Os
.Sh NAME
.Nm uchcom
-.Nd WinChipHead CH341/340 based USB serial adapter
+.Nd WinChipHead CH343/341/340 based USB serial adapter
.Sh SYNOPSIS
.Cd "uchcom* at uhub?"
.Cd "ucom* at uchcom?"
.Sh DESCRIPTION
The
.Nm
-driver supports WinChipHead CH341/340 serial devices.
+driver supports WinChipHead CH343/341/340 serial devices.
+.Pp
+The CH341/340 devices only support a variety of baud rates
+up to 921600.
+CH343 devices support any baud rate up to 6 Mbps.
.Sh SEE ALSO
.Xr tty 4 ,
.Xr ucom 4 ,
Index: share/man/man4/ucom.4
===================================================================
RCS file: /cvs/src/share/man/man4/ucom.4,v
retrieving revision 1.33
diff -u -p -u -p -r1.33 ucom.4
--- share/man/man4/ucom.4 7 Jun 2019 16:06:59 -0000 1.33
+++ share/man/man4/ucom.4 11 Apr 2024 05:35:56 -0000
@@ -38,7 +38,7 @@
.Cd "ucom* at moscom?" # MosChip Semiconductor MCS7703
.Cd "ucom* at uark?" # Arkmicro Technologies
.Cd "ucom* at ubsa?" # Belkin
-.Cd "ucom* at uchcom?" # WinChipHead CH341/340
+.Cd "ucom* at uchcom?" # WinChipHead CH343/341/340
.Cd "ucom* at ucycom?" # Cypress
.Cd "ucom* at uftdi?" # FTDI
.Cd "ucom* at uipaq?" # iPAQ
Index: share/man/man4/usb.4
===================================================================
RCS file: /cvs/src/share/man/man4/usb.4,v
retrieving revision 1.217
diff -u -p -u -p -r1.217 usb.4
--- share/man/man4/usb.4 4 Jan 2024 08:41:59 -0000 1.217
+++ share/man/man4/usb.4 11 Apr 2024 05:35:56 -0000
@@ -179,7 +179,7 @@ Arkmicro Technologies ARK3116 based USB
.It Xr ubsa 4
Belkin USB serial adapter
.It Xr uchcom 4
-WinChipHead CH341/340 based USB serial adapter
+WinChipHead CH343/341/340 based USB serial adapter
.It Xr ucom 4
USB tty support
.It Xr ucrcom 4
Index: sys/dev/usb/uchcom.c
===================================================================
RCS file: /cvs/src/sys/dev/usb/uchcom.c,v
retrieving revision 1.33
diff -u -p -u -p -r1.33 uchcom.c
--- sys/dev/usb/uchcom.c 9 Apr 2022 20:07:44 -0000 1.33
+++ sys/dev/usb/uchcom.c 11 Apr 2024 05:35:57 -0000
@@ -31,7 +31,7 @@
*/
/*
- * driver for WinChipHead CH341/340, the worst USB-serial chip in the world.
+ * driver for WinChipHead CH341/340/343.
*/
#include <sys/param.h>
@@ -41,8 +41,11 @@
#include <sys/tty.h>
#include <sys/device.h>
+#include <machine/bus.h>
+
#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
+#include <dev/usb/usbdivar.h>
#include <dev/usb/usbdi_util.h>
#include <dev/usb/usbdevs.h>
#include <dev/usb/ucomvar.h>
@@ -55,16 +58,20 @@ int uchcomdebug = 0;
#endif
#define DPRINTF(x) DPRINTFN(0, x)
-#define UCHCOM_IFACE_INDEX 0
+#define UCHCOM_IFACE_INDEX 0
+#define UCHCOM_SECOND_IFACE_INDEX 1
#define UCHCOM_REV_CH340 0x0250
+#define UCHCOM_REV_CH343 0x0440
#define UCHCOM_INPUT_BUF_SIZE 8
-#define UCHCOM_REQ_GET_VERSION 0x5F
-#define UCHCOM_REQ_READ_REG 0x95
-#define UCHCOM_REQ_WRITE_REG 0x9A
-#define UCHCOM_REQ_RESET 0xA1
-#define UCHCOM_REQ_SET_DTRRTS 0xA4
+#define UCHCOM_REQ_GET_VERSION 0x5F
+#define UCHCOM_REQ_READ_REG 0x95
+#define UCHCOM_REQ_WRITE_REG 0x9A
+#define UCHCOM_REQ_RESET 0xA1
+#define UCHCOM_REQ_SET_DTRRTS 0xA4
+#define UCHCOM_REQ_CH343_WRITE_REG 0xA8
+#define UCHCOM_REQ_SET_BAUDRATE UCHCOM_REQ_RESET
#define UCHCOM_REG_STAT1 0x06
#define UCHCOM_REG_STAT2 0x07
@@ -88,6 +95,8 @@ int uchcomdebug = 0;
#define UCHCOM_RTS_MASK 0x40
#define UCHCOM_BREAK_MASK 0x01
+#define UCHCOM_ABREAK_MASK 0x10
+#define UCHCOM_CH343_BREAK_MASK 0x80
#define UCHCOM_LCR_CS5 0x00
#define UCHCOM_LCR_CS6 0x01
@@ -106,6 +115,9 @@ int uchcomdebug = 0;
#define UCHCOM_INTR_STAT2 0x03
#define UCHCOM_INTR_LEAST 4
+#define UCHCOM_T 0x08
+#define UCHCOM_CL 0x04
+#define UCHCOM_CT 0x80
/*
* XXX - these magic numbers come from Linux (drivers/usb/serial/ch341.c).
* The manufacturer was unresponsive when asked for documentation.
@@ -115,12 +127,15 @@ int uchcomdebug = 0;
#define UCHCOMOBUFSIZE 256
+#define UCHCOM_TYPE_CH343 1
+
struct uchcom_softc
{
struct device sc_dev;
struct usbd_device *sc_udev;
struct device *sc_subdev;
- struct usbd_interface *sc_iface;
+ struct usbd_interface *sc_intr_iface;
+ struct usbd_interface *sc_data_iface;
/* */
int sc_intr_endpoint;
struct usbd_pipe *sc_intr_pipe;
@@ -129,6 +144,7 @@ struct uchcom_softc
/* */
int sc_release;
uint8_t sc_version;
+ int sc_type;
int sc_dtr;
int sc_rts;
u_char sc_lsr;
@@ -178,8 +194,6 @@ int uchcom_open(void *, int);
void uchcom_close(void *, int);
void uchcom_intr(struct usbd_xfer *, void *, usbd_status);
-int uchcom_find_ifaces(struct uchcom_softc *,
- struct usbd_interface **);
int uchcom_find_endpoints(struct uchcom_softc *,
struct uchcom_endpoints *);
void uchcom_close_intr_pipe(struct uchcom_softc *);
@@ -202,9 +216,14 @@ void uchcom_convert_status(struct uchco
int uchcom_update_status(struct uchcom_softc *);
int uchcom_set_dtrrts(struct uchcom_softc *, int, int);
int uchcom_set_break(struct uchcom_softc *, int);
+int uchcom_set_break_ch343(struct uchcom_softc *, int);
+void uchcom_calc_baudrate_ch343(uint32_t, uint8_t *, uint8_t *);
int uchcom_calc_divider_settings(struct uchcom_divider *, uint32_t);
+int uchcom_set_dte_rate_ch343(struct uchcom_softc *, uint32_t,
+ uint16_t);
int uchcom_set_dte_rate(struct uchcom_softc *, uint32_t);
-int uchcom_set_line_control(struct uchcom_softc *, tcflag_t);
+uint16_t uchcom_set_line_control(struct uchcom_softc *, tcflag_t,
+ uint16_t *);
int uchcom_clear_chip(struct uchcom_softc *);
int uchcom_reset_chip(struct uchcom_softc *);
int uchcom_setup_comm(struct uchcom_softc *);
@@ -229,7 +248,8 @@ const struct ucom_methods uchcom_methods
static const struct usb_devno uchcom_devs[] = {
{ USB_VENDOR_WCH, USB_PRODUCT_WCH_CH341 },
{ USB_VENDOR_WCH2, USB_PRODUCT_WCH2_CH340 },
- { USB_VENDOR_WCH2, USB_PRODUCT_WCH2_CH341A }
+ { USB_VENDOR_WCH2, USB_PRODUCT_WCH2_CH341A },
+ { USB_VENDOR_WCH2, USB_PRODUCT_WCH2_CH343 }
};
struct cfdriver uchcom_cd = {
@@ -262,26 +282,22 @@ uchcom_attach(struct device *parent, str
struct uchcom_softc *sc = (struct uchcom_softc *)self;
struct usb_attach_arg *uaa = aux;
struct ucom_attach_args uca;
- struct usbd_device *dev = uaa->device;
struct uchcom_endpoints endpoints;
- sc->sc_udev = dev;
+ sc->sc_udev = uaa->device;
+ sc->sc_intr_iface = uaa->iface;
sc->sc_dtr = sc->sc_rts = -1;
sc->sc_release = uaa->release;
DPRINTF(("\n\nuchcom attach: sc=%p\n", sc));
- switch (sc->sc_release) {
- case UCHCOM_REV_CH340:
+ if (sc->sc_release >= UCHCOM_REV_CH343) {
+ printf("%s: CH343\n", sc->sc_dev.dv_xname);
+ sc->sc_type = UCHCOM_TYPE_CH343;
+ } else if (sc->sc_release == UCHCOM_REV_CH340)
printf("%s: CH340\n", sc->sc_dev.dv_xname);
- break;
- default:
+ else
printf("%s: CH341\n", sc->sc_dev.dv_xname);
- break;
- }
-
- if (uchcom_find_ifaces(sc, &sc->sc_iface))
- goto failed;
if (uchcom_find_endpoints(sc, &endpoints))
goto failed;
@@ -297,8 +313,8 @@ uchcom_attach(struct device *parent, str
uca.obufsize = UCHCOMOBUFSIZE;
uca.ibufsizepad = endpoints.ep_bulkin_size;
uca.opkthdrlen = 0;
- uca.device = dev;
- uca.iface = sc->sc_iface;
+ uca.device = sc->sc_udev;
+ uca.iface = sc->sc_data_iface;
uca.methods = &uchcom_methods;
uca.arg = sc;
uca.info = NULL;
@@ -330,33 +346,29 @@ uchcom_detach(struct device *self, int f
}
int
-uchcom_find_ifaces(struct uchcom_softc *sc, struct usbd_interface **riface)
-{
- usbd_status err;
-
- err = usbd_device2interface_handle(sc->sc_udev, UCHCOM_IFACE_INDEX,
- riface);
- if (err) {
- printf("\n%s: failed to get interface: %s\n",
- sc->sc_dev.dv_xname, usbd_errstr(err));
- return -1;
- }
-
- return 0;
-}
-
-int
uchcom_find_endpoints(struct uchcom_softc *sc,
struct uchcom_endpoints *endpoints)
{
int i, bin=-1, bout=-1, intr=-1, binsize=0, isize=0;
+ usb_config_descriptor_t *cdesc;
usb_interface_descriptor_t *id;
usb_endpoint_descriptor_t *ed;
+ usbd_status err;
+ uint8_t ifaceno;
+
+ /* Get the config descriptor. */
+ cdesc = usbd_get_config_descriptor(sc->sc_udev);
- id = usbd_get_interface_descriptor(sc->sc_iface);
+ if (cdesc == NULL) {
+ printf("%s: failed to get configuration descriptor\n",
+ sc->sc_dev.dv_xname);
+ return -1;
+ }
+
+ id = usbd_get_interface_descriptor(sc->sc_intr_iface);
for (i = 0; i < id->bNumEndpoints; i++) {
- ed = usbd_interface2endpoint_descriptor(sc->sc_iface, i);
+ ed = usbd_interface2endpoint_descriptor(sc->sc_intr_iface, i);
if (ed == NULL) {
printf("%s: no endpoint descriptor for %d\n",
sc->sc_dev.dv_xname, i);
@@ -367,12 +379,36 @@ uchcom_find_endpoints(struct uchcom_soft
UE_GET_XFERTYPE(ed->bmAttributes) == UE_INTERRUPT) {
intr = ed->bEndpointAddress;
isize = UGETW(ed->wMaxPacketSize);
- } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
- UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
+ }
+ }
+
+ ifaceno = (cdesc->bNumInterfaces == 2) ?
+ UCHCOM_SECOND_IFACE_INDEX : UCHCOM_IFACE_INDEX;
+
+ err = usbd_device2interface_handle(sc->sc_udev, ifaceno,
+ &sc->sc_data_iface);
+ if (err) {
+ printf("\n%s: failed to get second interface, err=%s\n",
+ sc->sc_dev.dv_xname, usbd_errstr(err));
+ return -1;
+ }
+
+ id = usbd_get_interface_descriptor(sc->sc_data_iface);
+
+ for (i = 0; i < id->bNumEndpoints; i++) {
+ ed = usbd_interface2endpoint_descriptor(sc->sc_data_iface, i);
+ if (ed == NULL) {
+ printf("%s: no endpoint descriptor for %d\n",
+ sc->sc_dev.dv_xname, i);
+ return -1;
+ }
+
+ if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
+ UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
bin = ed->bEndpointAddress;
binsize = UGETW(ed->wMaxPacketSize);
} else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT &&
- UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
+ UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
bout = ed->bEndpointAddress;
}
}
@@ -400,6 +436,8 @@ uchcom_find_endpoints(struct uchcom_soft
DPRINTF(("%s: bulkin=%d, bulkout=%d, intr=%d, isize=%d\n",
sc->sc_dev.dv_xname, bin, bout, intr, isize));
+ usbd_claim_iface(sc->sc_udev, ifaceno);
+
endpoints->ep_intr = intr;
endpoints->ep_intr_size = isize;
endpoints->ep_bulkin = bin;
@@ -453,8 +491,9 @@ uchcom_write_reg(struct uchcom_softc *sc
DPRINTF(("uchcom: write reg 0x%02X<-0x%02X, 0x%02X<-0x%02X\n",
(unsigned)reg1, (unsigned)val1,
(unsigned)reg2, (unsigned)val2));
- return uchcom_generic_control_out(
- sc, UCHCOM_REQ_WRITE_REG,
+ return uchcom_generic_control_out(sc,
+ (sc->sc_type != UCHCOM_TYPE_CH343) ?
+ UCHCOM_REQ_WRITE_REG : UCHCOM_REQ_CH343_WRITE_REG,
reg1|((uint16_t)reg2<<8), val1|((uint16_t)val2<<8));
}
@@ -616,6 +655,46 @@ uchcom_set_break(struct uchcom_softc *sc
}
int
+uchcom_set_break_ch343(struct uchcom_softc *sc, int onoff)
+{
+ usbd_status err;
+ uint8_t brk = UCHCOM_CH343_BREAK_MASK;
+
+ if (!onoff)
+ brk |= UCHCOM_ABREAK_MASK;
+
+ err = uchcom_write_reg(sc, brk, 0, 0, 0);
+ if (err)
+ return EIO;
+
+ return 0;
+}
+
+void
+uchcom_calc_baudrate_ch343(uint32_t rate, uint8_t *divisor, uint8_t *factor)
+{
+ uint32_t clk = 12000000;
+
+ if (rate >= 256000)
+ *divisor = 7;
+ else if (rate > 23529) {
+ clk /= 2;
+ *divisor = 3;
+ } else if (rate > 2941) {
+ clk /= 16;
+ *divisor = 2;
+ } else if (rate > 367) {
+ clk /= 128;
+ *divisor = 1;
+ } else {
+ clk = 11719;
+ *divisor = 0;
+ }
+
+ *factor = 256 - clk / rate;
+}
+
+int
uchcom_calc_divider_settings(struct uchcom_divider *dp, uint32_t rate)
{
int i;
@@ -655,6 +734,26 @@ found:
}
int
+uchcom_set_dte_rate_ch343(struct uchcom_softc *sc, uint32_t rate, uint16_t val)
+{
+ usbd_status err;
+ uint16_t idx;
+ uint8_t factor, div;
+
+ uchcom_calc_baudrate_ch343(rate, &div, &factor);
+ idx = (factor << 8) | div;
+
+ err = uchcom_generic_control_out(sc, UCHCOM_REQ_SET_BAUDRATE, val, idx);
+ if (err) {
+ printf("%s: cannot set DTE rate: %s\n",
+ sc->sc_dev.dv_xname, usbd_errstr(err));
+ return EIO;
+ }
+
+ return 0;
+}
+
+int
uchcom_set_dte_rate(struct uchcom_softc *sc, uint32_t rate)
{
usbd_status err;
@@ -677,8 +776,8 @@ uchcom_set_dte_rate(struct uchcom_softc
return 0;
}
-int
-uchcom_set_line_control(struct uchcom_softc *sc, tcflag_t cflag)
+uint16_t
+uchcom_set_line_control(struct uchcom_softc *sc, tcflag_t cflag, uint16_t *val)
{
usbd_status err;
uint8_t lcr = 0, lcr2 = 0;
@@ -703,12 +802,14 @@ uchcom_set_line_control(struct uchcom_so
return 0;
}
- err = uchcom_read_reg(sc, UCHCOM_REG_LCR, &lcr,
- UCHCOM_REG_LCR2, &lcr2);
- if (err) {
- printf("%s: cannot get LCR: %s\n",
- sc->sc_dev.dv_xname, usbd_errstr(err));
- return EIO;
+ if (sc->sc_type != UCHCOM_TYPE_CH343) {
+ err = uchcom_read_reg(sc, UCHCOM_REG_LCR, &lcr, UCHCOM_REG_LCR2,
+ &lcr2);
+ if (err) {
+ printf("%s: cannot get LCR: %s\n",
+ sc->sc_dev.dv_xname, usbd_errstr(err));
+ return EIO;
+ }
}
lcr = UCHCOM_LCR_RXE | UCHCOM_LCR_TXE;
@@ -738,12 +839,16 @@ uchcom_set_line_control(struct uchcom_so
lcr |= UCHCOM_LCR_STOPB;
}
- err = uchcom_write_reg(sc, UCHCOM_REG_LCR, lcr, UCHCOM_REG_LCR2, lcr2);
- if (err) {
- printf("%s: cannot set LCR: %s\n",
- sc->sc_dev.dv_xname, usbd_errstr(err));
- return EIO;
- }
+ if (sc->sc_type != UCHCOM_TYPE_CH343) {
+ err = uchcom_write_reg(sc, UCHCOM_REG_LCR, lcr, UCHCOM_REG_LCR2,
+ lcr2);
+ if (err) {
+ printf("%s: cannot set LCR: %s\n",
+ sc->sc_dev.dv_xname, usbd_errstr(err));
+ return EIO;
+ }
+ } else
+ *val = UCHCOM_T | UCHCOM_CL | UCHCOM_CT | lcr << 8;
return 0;
}
@@ -790,10 +895,6 @@ uchcom_setup_comm(struct uchcom_softc *s
{
int ret;
- ret = uchcom_update_version(sc);
- if (ret)
- return ret;
-
ret = uchcom_clear_chip(sc);
if (ret)
return ret;
@@ -802,7 +903,7 @@ uchcom_setup_comm(struct uchcom_softc *s
if (ret)
return ret;
- ret = uchcom_set_line_control(sc, CS8);
+ ret = uchcom_set_line_control(sc, CS8, 0);
if (ret)
return ret;
@@ -818,11 +919,6 @@ uchcom_setup_comm(struct uchcom_softc *s
if (ret)
return ret;
- sc->sc_dtr = sc->sc_rts = 1;
- ret = uchcom_set_dtrrts(sc, sc->sc_dtr, sc->sc_rts);
- if (ret)
- return ret;
-
return 0;
}
@@ -833,7 +929,7 @@ uchcom_setup_intr_pipe(struct uchcom_sof
if (sc->sc_intr_endpoint != -1 && sc->sc_intr_pipe == NULL) {
sc->sc_intr_buf = malloc(sc->sc_isize, M_USBDEV, M_WAITOK);
- err = usbd_open_pipe_intr(sc->sc_iface,
+ err = usbd_open_pipe_intr(sc->sc_intr_iface,
sc->sc_intr_endpoint,
USBD_SHORT_XFER_OK,
&sc->sc_intr_pipe, sc,
@@ -899,7 +995,10 @@ uchcom_set(void *arg, int portno, int re
uchcom_set_dtrrts(sc, sc->sc_dtr, sc->sc_rts);
break;
case UCOM_SET_BREAK:
- uchcom_set_break(sc, onoff);
+ if (sc->sc_type == UCHCOM_TYPE_CH343)
+ uchcom_set_break_ch343(sc, onoff);
+ else
+ uchcom_set_break(sc, onoff);
break;
}
}
@@ -908,16 +1007,20 @@ int
uchcom_param(void *arg, int portno, struct termios *t)
{
struct uchcom_softc *sc = arg;
+ uint16_t val = 0;
int ret;
if (usbd_is_dying(sc->sc_udev))
return 0;
- ret = uchcom_set_line_control(sc, t->c_cflag);
+ ret = uchcom_set_line_control(sc, t->c_cflag, &val);
if (ret)
return ret;
- ret = uchcom_set_dte_rate(sc, t->c_ospeed);
+ if (sc->sc_type == UCHCOM_TYPE_CH343)
+ ret = uchcom_set_dte_rate_ch343(sc, t->c_ospeed, val);
+ else
+ ret = uchcom_set_dte_rate(sc, t->c_ospeed);
if (ret)
return ret;
@@ -937,7 +1040,19 @@ uchcom_open(void *arg, int portno)
if (ret)
return ret;
- ret = uchcom_setup_comm(sc);
+ ret = uchcom_update_version(sc);
+ if (ret)
+ return ret;
+
+ if (sc->sc_type == UCHCOM_TYPE_CH343)
+ ret = uchcom_update_status(sc);
+ else
+ ret = uchcom_setup_comm(sc);
+ if (ret)
+ return ret;
+
+ sc->sc_dtr = sc->sc_rts = 1;
+ ret = uchcom_set_dtrrts(sc, sc->sc_dtr, sc->sc_rts);
if (ret)
return ret;
@@ -961,6 +1076,7 @@ uchcom_intr(struct usbd_xfer *xfer, void
{
struct uchcom_softc *sc = priv;
u_char *buf = sc->sc_intr_buf;
+ uint32_t intrstat;
if (usbd_is_dying(sc->sc_udev))
return;
@@ -982,6 +1098,9 @@ uchcom_intr(struct usbd_xfer *xfer, void
(unsigned)buf[4], (unsigned)buf[5],
(unsigned)buf[6], (unsigned)buf[7]));
- uchcom_convert_status(sc, buf[UCHCOM_INTR_STAT1]);
+ intrstat = (sc->sc_type == UCHCOM_TYPE_CH343) ?
+ xfer->actlen - 1 : UCHCOM_INTR_STAT1;
+
+ uchcom_convert_status(sc, buf[intrstat]);
ucom_status_change((struct ucom_softc *) sc->sc_subdev);
}
Index: sys/dev/usb/usbdevs
===================================================================
RCS file: /cvs/src/sys/dev/usb/usbdevs,v
retrieving revision 1.760
diff -u -p -u -p -r1.760 usbdevs
--- sys/dev/usb/usbdevs 27 Nov 2023 20:03:50 -0000 1.760
+++ sys/dev/usb/usbdevs 11 Apr 2024 05:35:57 -0000
@@ -4652,6 +4652,7 @@ product WAVESENSE JAZZ 0xaaaa Jazz bloo
/* WCH/QinHeng Electronics */
product WCH CH341 0x5523 CH341 serial/parallel
product WCH2 CH341A 0x5523 CH341A serial/parallel
+product WCH2 CH343 0x55d3 CH343 serial/parallel
product WCH2 CH340 0x7523 CH340 serial/parallel
product WCH2 TEMPER 0xe025 TEMPer sensor
uchcom(4): add CH343 support