mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-05 02:19:51 +00:00
![Niv Sardi](/assets/img/avatar_default.png)
Add PID for CH340 that's found on cheap programmers. The driver works flawlessly as soon as the new PID (0x9986) is added to it. These look like ANU232MI but ship with a ch341 inside. They have no special identifiers (mine only has the string "DB9D20130716" printed on the PCB and nothing identifiable on the packaging. The merchant i bought it from doesn't sell these anymore). the lsusb -v output is: Bus 001 Device 009: ID 9986:7523 Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 1.10 bDeviceClass 255 Vendor Specific Class bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 8 idVendor 0x9986 idProduct 0x7523 bcdDevice 2.54 iManufacturer 0 iProduct 0 iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 0x0027 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 (Bus Powered) MaxPower 96mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 3 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 1 bInterfaceProtocol 2 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0020 1x 32 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x02 EP 2 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0020 1x 32 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0008 1x 8 bytes bInterval 1 Signed-off-by: Niv Sardi <xaiki@evilgiggle.com> Cc: stable@vger.kernel.org Signed-off-by: Johan Hovold <johan@kernel.org>
877 lines
22 KiB
C
877 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright 2007, Frank A Kingswood <frank@kingswood-consulting.co.uk>
|
|
* Copyright 2007, Werner Cornelius <werner@cornelius-consult.de>
|
|
* Copyright 2009, Boris Hajduk <boris@hajduk.org>
|
|
*
|
|
* ch341.c implements a serial port driver for the Winchiphead CH341.
|
|
*
|
|
* The CH341 device can be used to implement an RS232 asynchronous
|
|
* serial port, an IEEE-1284 parallel printer port or a memory-like
|
|
* interface. In all cases the CH341 supports an I2C interface as well.
|
|
* This driver only supports the asynchronous serial interface.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/usb/serial.h>
|
|
#include <linux/serial.h>
|
|
#include <asm/unaligned.h>
|
|
|
|
#define DEFAULT_BAUD_RATE 9600
|
|
#define DEFAULT_TIMEOUT 1000
|
|
|
|
/* flags for IO-Bits */
|
|
#define CH341_BIT_RTS (1 << 6)
|
|
#define CH341_BIT_DTR (1 << 5)
|
|
|
|
/******************************/
|
|
/* interrupt pipe definitions */
|
|
/******************************/
|
|
/* always 4 interrupt bytes */
|
|
/* first irq byte normally 0x08 */
|
|
/* second irq byte base 0x7d + below */
|
|
/* third irq byte base 0x94 + below */
|
|
/* fourth irq byte normally 0xee */
|
|
|
|
/* second interrupt byte */
|
|
#define CH341_MULT_STAT 0x04 /* multiple status since last interrupt event */
|
|
|
|
/* status returned in third interrupt answer byte, inverted in data
|
|
from irq */
|
|
#define CH341_BIT_CTS 0x01
|
|
#define CH341_BIT_DSR 0x02
|
|
#define CH341_BIT_RI 0x04
|
|
#define CH341_BIT_DCD 0x08
|
|
#define CH341_BITS_MODEM_STAT 0x0f /* all bits */
|
|
|
|
/* Break support - the information used to implement this was gleaned from
|
|
* the Net/FreeBSD uchcom.c driver by Takanori Watanabe. Domo arigato.
|
|
*/
|
|
|
|
#define CH341_REQ_READ_VERSION 0x5F
|
|
#define CH341_REQ_WRITE_REG 0x9A
|
|
#define CH341_REQ_READ_REG 0x95
|
|
#define CH341_REQ_SERIAL_INIT 0xA1
|
|
#define CH341_REQ_MODEM_CTRL 0xA4
|
|
|
|
#define CH341_REG_BREAK 0x05
|
|
#define CH341_REG_PRESCALER 0x12
|
|
#define CH341_REG_DIVISOR 0x13
|
|
#define CH341_REG_LCR 0x18
|
|
#define CH341_REG_LCR2 0x25
|
|
|
|
#define CH341_NBREAK_BITS 0x01
|
|
|
|
#define CH341_LCR_ENABLE_RX 0x80
|
|
#define CH341_LCR_ENABLE_TX 0x40
|
|
#define CH341_LCR_MARK_SPACE 0x20
|
|
#define CH341_LCR_PAR_EVEN 0x10
|
|
#define CH341_LCR_ENABLE_PAR 0x08
|
|
#define CH341_LCR_STOP_BITS_2 0x04
|
|
#define CH341_LCR_CS8 0x03
|
|
#define CH341_LCR_CS7 0x02
|
|
#define CH341_LCR_CS6 0x01
|
|
#define CH341_LCR_CS5 0x00
|
|
|
|
#define CH341_QUIRK_LIMITED_PRESCALER BIT(0)
|
|
#define CH341_QUIRK_SIMULATE_BREAK BIT(1)
|
|
|
|
static const struct usb_device_id id_table[] = {
|
|
{ USB_DEVICE(0x1a86, 0x5512) },
|
|
{ USB_DEVICE(0x1a86, 0x5523) },
|
|
{ USB_DEVICE(0x1a86, 0x7522) },
|
|
{ USB_DEVICE(0x1a86, 0x7523) },
|
|
{ USB_DEVICE(0x4348, 0x5523) },
|
|
{ USB_DEVICE(0x9986, 0x7523) },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(usb, id_table);
|
|
|
|
struct ch341_private {
|
|
spinlock_t lock; /* access lock */
|
|
unsigned baud_rate; /* set baud rate */
|
|
u8 mcr;
|
|
u8 msr;
|
|
u8 lcr;
|
|
unsigned long quirks;
|
|
unsigned long break_end;
|
|
};
|
|
|
|
static void ch341_set_termios(struct tty_struct *tty,
|
|
struct usb_serial_port *port,
|
|
struct ktermios *old_termios);
|
|
|
|
static int ch341_control_out(struct usb_device *dev, u8 request,
|
|
u16 value, u16 index)
|
|
{
|
|
int r;
|
|
|
|
dev_dbg(&dev->dev, "%s - (%02x,%04x,%04x)\n", __func__,
|
|
request, value, index);
|
|
|
|
r = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request,
|
|
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
|
|
value, index, NULL, 0, DEFAULT_TIMEOUT);
|
|
if (r < 0)
|
|
dev_err(&dev->dev, "failed to send control message: %d\n", r);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int ch341_control_in(struct usb_device *dev,
|
|
u8 request, u16 value, u16 index,
|
|
char *buf, unsigned bufsize)
|
|
{
|
|
int r;
|
|
|
|
dev_dbg(&dev->dev, "%s - (%02x,%04x,%04x,%u)\n", __func__,
|
|
request, value, index, bufsize);
|
|
|
|
r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request,
|
|
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
|
|
value, index, buf, bufsize, DEFAULT_TIMEOUT);
|
|
if (r < (int)bufsize) {
|
|
if (r >= 0) {
|
|
dev_err(&dev->dev,
|
|
"short control message received (%d < %u)\n",
|
|
r, bufsize);
|
|
r = -EIO;
|
|
}
|
|
|
|
dev_err(&dev->dev, "failed to receive control message: %d\n",
|
|
r);
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define CH341_CLKRATE 48000000
|
|
#define CH341_CLK_DIV(ps, fact) (1 << (12 - 3 * (ps) - (fact)))
|
|
#define CH341_MIN_RATE(ps) (CH341_CLKRATE / (CH341_CLK_DIV((ps), 1) * 512))
|
|
|
|
static const speed_t ch341_min_rates[] = {
|
|
CH341_MIN_RATE(0),
|
|
CH341_MIN_RATE(1),
|
|
CH341_MIN_RATE(2),
|
|
CH341_MIN_RATE(3),
|
|
};
|
|
|
|
/* Supported range is 46 to 3000000 bps. */
|
|
#define CH341_MIN_BPS DIV_ROUND_UP(CH341_CLKRATE, CH341_CLK_DIV(0, 0) * 256)
|
|
#define CH341_MAX_BPS (CH341_CLKRATE / (CH341_CLK_DIV(3, 0) * 2))
|
|
|
|
/*
|
|
* The device line speed is given by the following equation:
|
|
*
|
|
* baudrate = 48000000 / (2^(12 - 3 * ps - fact) * div), where
|
|
*
|
|
* 0 <= ps <= 3,
|
|
* 0 <= fact <= 1,
|
|
* 2 <= div <= 256 if fact = 0, or
|
|
* 9 <= div <= 256 if fact = 1
|
|
*/
|
|
static int ch341_get_divisor(struct ch341_private *priv, speed_t speed)
|
|
{
|
|
unsigned int fact, div, clk_div;
|
|
bool force_fact0 = false;
|
|
int ps;
|
|
|
|
/*
|
|
* Clamp to supported range, this makes the (ps < 0) and (div < 2)
|
|
* sanity checks below redundant.
|
|
*/
|
|
speed = clamp_val(speed, CH341_MIN_BPS, CH341_MAX_BPS);
|
|
|
|
/*
|
|
* Start with highest possible base clock (fact = 1) that will give a
|
|
* divisor strictly less than 512.
|
|
*/
|
|
fact = 1;
|
|
for (ps = 3; ps >= 0; ps--) {
|
|
if (speed > ch341_min_rates[ps])
|
|
break;
|
|
}
|
|
|
|
if (ps < 0)
|
|
return -EINVAL;
|
|
|
|
/* Determine corresponding divisor, rounding down. */
|
|
clk_div = CH341_CLK_DIV(ps, fact);
|
|
div = CH341_CLKRATE / (clk_div * speed);
|
|
|
|
/* Some devices require a lower base clock if ps < 3. */
|
|
if (ps < 3 && (priv->quirks & CH341_QUIRK_LIMITED_PRESCALER))
|
|
force_fact0 = true;
|
|
|
|
/* Halve base clock (fact = 0) if required. */
|
|
if (div < 9 || div > 255 || force_fact0) {
|
|
div /= 2;
|
|
clk_div *= 2;
|
|
fact = 0;
|
|
}
|
|
|
|
if (div < 2)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Pick next divisor if resulting rate is closer to the requested one,
|
|
* scale up to avoid rounding errors on low rates.
|
|
*/
|
|
if (16 * CH341_CLKRATE / (clk_div * div) - 16 * speed >=
|
|
16 * speed - 16 * CH341_CLKRATE / (clk_div * (div + 1)))
|
|
div++;
|
|
|
|
/*
|
|
* Prefer lower base clock (fact = 0) if even divisor.
|
|
*
|
|
* Note that this makes the receiver more tolerant to errors.
|
|
*/
|
|
if (fact == 1 && div % 2 == 0) {
|
|
div /= 2;
|
|
fact = 0;
|
|
}
|
|
|
|
return (0x100 - div) << 8 | fact << 2 | ps;
|
|
}
|
|
|
|
static int ch341_set_baudrate_lcr(struct usb_device *dev,
|
|
struct ch341_private *priv,
|
|
speed_t baud_rate, u8 lcr)
|
|
{
|
|
int val;
|
|
int r;
|
|
|
|
if (!baud_rate)
|
|
return -EINVAL;
|
|
|
|
val = ch341_get_divisor(priv, baud_rate);
|
|
if (val < 0)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* CH341A buffers data until a full endpoint-size packet (32 bytes)
|
|
* has been received unless bit 7 is set.
|
|
*/
|
|
val |= BIT(7);
|
|
|
|
r = ch341_control_out(dev, CH341_REQ_WRITE_REG,
|
|
CH341_REG_DIVISOR << 8 | CH341_REG_PRESCALER,
|
|
val);
|
|
if (r)
|
|
return r;
|
|
|
|
/*
|
|
* Chip versions before version 0x30 as read using
|
|
* CH341_REQ_READ_VERSION used separate registers for line control
|
|
* (stop bits, parity and word length). Version 0x30 and above use
|
|
* CH341_REG_LCR only and CH341_REG_LCR2 is always set to zero.
|
|
*/
|
|
r = ch341_control_out(dev, CH341_REQ_WRITE_REG,
|
|
CH341_REG_LCR2 << 8 | CH341_REG_LCR, lcr);
|
|
if (r)
|
|
return r;
|
|
|
|
return r;
|
|
}
|
|
|
|
static int ch341_set_handshake(struct usb_device *dev, u8 control)
|
|
{
|
|
return ch341_control_out(dev, CH341_REQ_MODEM_CTRL, ~control, 0);
|
|
}
|
|
|
|
static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv)
|
|
{
|
|
const unsigned int size = 2;
|
|
char *buffer;
|
|
int r;
|
|
unsigned long flags;
|
|
|
|
buffer = kmalloc(size, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
r = ch341_control_in(dev, CH341_REQ_READ_REG, 0x0706, 0, buffer, size);
|
|
if (r < 0)
|
|
goto out;
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
priv->msr = (~(*buffer)) & CH341_BITS_MODEM_STAT;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
out: kfree(buffer);
|
|
return r;
|
|
}
|
|
|
|
/* -------------------------------------------------------------------------- */
|
|
|
|
static int ch341_configure(struct usb_device *dev, struct ch341_private *priv)
|
|
{
|
|
const unsigned int size = 2;
|
|
char *buffer;
|
|
int r;
|
|
|
|
buffer = kmalloc(size, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
/* expect two bytes 0x27 0x00 */
|
|
r = ch341_control_in(dev, CH341_REQ_READ_VERSION, 0, 0, buffer, size);
|
|
if (r < 0)
|
|
goto out;
|
|
dev_dbg(&dev->dev, "Chip version: 0x%02x\n", buffer[0]);
|
|
|
|
r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT, 0, 0);
|
|
if (r < 0)
|
|
goto out;
|
|
|
|
r = ch341_set_baudrate_lcr(dev, priv, priv->baud_rate, priv->lcr);
|
|
if (r < 0)
|
|
goto out;
|
|
|
|
r = ch341_set_handshake(dev, priv->mcr);
|
|
|
|
out: kfree(buffer);
|
|
return r;
|
|
}
|
|
|
|
static int ch341_detect_quirks(struct usb_serial_port *port)
|
|
{
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
struct usb_device *udev = port->serial->dev;
|
|
const unsigned int size = 2;
|
|
unsigned long quirks = 0;
|
|
char *buffer;
|
|
int r;
|
|
|
|
buffer = kmalloc(size, GFP_KERNEL);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* A subset of CH34x devices does not support all features. The
|
|
* prescaler is limited and there is no support for sending a RS232
|
|
* break condition. A read failure when trying to set up the latter is
|
|
* used to detect these devices.
|
|
*/
|
|
r = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), CH341_REQ_READ_REG,
|
|
USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
|
|
CH341_REG_BREAK, 0, buffer, size, DEFAULT_TIMEOUT);
|
|
if (r == -EPIPE) {
|
|
dev_info(&port->dev, "break control not supported, using simulated break\n");
|
|
quirks = CH341_QUIRK_LIMITED_PRESCALER | CH341_QUIRK_SIMULATE_BREAK;
|
|
r = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (r != size) {
|
|
if (r >= 0)
|
|
r = -EIO;
|
|
dev_err(&port->dev, "failed to read break control: %d\n", r);
|
|
goto out;
|
|
}
|
|
|
|
r = 0;
|
|
out:
|
|
kfree(buffer);
|
|
|
|
if (quirks) {
|
|
dev_dbg(&port->dev, "enabling quirk flags: 0x%02lx\n", quirks);
|
|
priv->quirks |= quirks;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int ch341_port_probe(struct usb_serial_port *port)
|
|
{
|
|
struct ch341_private *priv;
|
|
int r;
|
|
|
|
priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
spin_lock_init(&priv->lock);
|
|
priv->baud_rate = DEFAULT_BAUD_RATE;
|
|
/*
|
|
* Some CH340 devices appear unable to change the initial LCR
|
|
* settings, so set a sane 8N1 default.
|
|
*/
|
|
priv->lcr = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX | CH341_LCR_CS8;
|
|
|
|
r = ch341_configure(port->serial->dev, priv);
|
|
if (r < 0)
|
|
goto error;
|
|
|
|
usb_set_serial_port_data(port, priv);
|
|
|
|
r = ch341_detect_quirks(port);
|
|
if (r < 0)
|
|
goto error;
|
|
|
|
return 0;
|
|
|
|
error: kfree(priv);
|
|
return r;
|
|
}
|
|
|
|
static void ch341_port_remove(struct usb_serial_port *port)
|
|
{
|
|
struct ch341_private *priv;
|
|
|
|
priv = usb_get_serial_port_data(port);
|
|
kfree(priv);
|
|
}
|
|
|
|
static int ch341_carrier_raised(struct usb_serial_port *port)
|
|
{
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
if (priv->msr & CH341_BIT_DCD)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static void ch341_dtr_rts(struct usb_serial_port *port, int on)
|
|
{
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
unsigned long flags;
|
|
|
|
/* drop DTR and RTS */
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
if (on)
|
|
priv->mcr |= CH341_BIT_RTS | CH341_BIT_DTR;
|
|
else
|
|
priv->mcr &= ~(CH341_BIT_RTS | CH341_BIT_DTR);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
ch341_set_handshake(port->serial->dev, priv->mcr);
|
|
}
|
|
|
|
static void ch341_close(struct usb_serial_port *port)
|
|
{
|
|
usb_serial_generic_close(port);
|
|
usb_kill_urb(port->interrupt_in_urb);
|
|
}
|
|
|
|
|
|
/* open this device, set default parameters */
|
|
static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port)
|
|
{
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
int r;
|
|
|
|
if (tty)
|
|
ch341_set_termios(tty, port, NULL);
|
|
|
|
dev_dbg(&port->dev, "%s - submitting interrupt urb\n", __func__);
|
|
r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
|
|
if (r) {
|
|
dev_err(&port->dev, "%s - failed to submit interrupt urb: %d\n",
|
|
__func__, r);
|
|
return r;
|
|
}
|
|
|
|
r = ch341_get_status(port->serial->dev, priv);
|
|
if (r < 0) {
|
|
dev_err(&port->dev, "failed to read modem status: %d\n", r);
|
|
goto err_kill_interrupt_urb;
|
|
}
|
|
|
|
r = usb_serial_generic_open(tty, port);
|
|
if (r)
|
|
goto err_kill_interrupt_urb;
|
|
|
|
return 0;
|
|
|
|
err_kill_interrupt_urb:
|
|
usb_kill_urb(port->interrupt_in_urb);
|
|
|
|
return r;
|
|
}
|
|
|
|
/* Old_termios contains the original termios settings and
|
|
* tty->termios contains the new setting to be used.
|
|
*/
|
|
static void ch341_set_termios(struct tty_struct *tty,
|
|
struct usb_serial_port *port, struct ktermios *old_termios)
|
|
{
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
unsigned baud_rate;
|
|
unsigned long flags;
|
|
u8 lcr;
|
|
int r;
|
|
|
|
/* redundant changes may cause the chip to lose bytes */
|
|
if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
|
|
return;
|
|
|
|
baud_rate = tty_get_baud_rate(tty);
|
|
|
|
lcr = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX;
|
|
|
|
switch (C_CSIZE(tty)) {
|
|
case CS5:
|
|
lcr |= CH341_LCR_CS5;
|
|
break;
|
|
case CS6:
|
|
lcr |= CH341_LCR_CS6;
|
|
break;
|
|
case CS7:
|
|
lcr |= CH341_LCR_CS7;
|
|
break;
|
|
case CS8:
|
|
lcr |= CH341_LCR_CS8;
|
|
break;
|
|
}
|
|
|
|
if (C_PARENB(tty)) {
|
|
lcr |= CH341_LCR_ENABLE_PAR;
|
|
if (C_PARODD(tty) == 0)
|
|
lcr |= CH341_LCR_PAR_EVEN;
|
|
if (C_CMSPAR(tty))
|
|
lcr |= CH341_LCR_MARK_SPACE;
|
|
}
|
|
|
|
if (C_CSTOPB(tty))
|
|
lcr |= CH341_LCR_STOP_BITS_2;
|
|
|
|
if (baud_rate) {
|
|
priv->baud_rate = baud_rate;
|
|
|
|
r = ch341_set_baudrate_lcr(port->serial->dev, priv,
|
|
priv->baud_rate, lcr);
|
|
if (r < 0 && old_termios) {
|
|
priv->baud_rate = tty_termios_baud_rate(old_termios);
|
|
tty_termios_copy_hw(&tty->termios, old_termios);
|
|
} else if (r == 0) {
|
|
priv->lcr = lcr;
|
|
}
|
|
}
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
if (C_BAUD(tty) == B0)
|
|
priv->mcr &= ~(CH341_BIT_DTR | CH341_BIT_RTS);
|
|
else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
|
|
priv->mcr |= (CH341_BIT_DTR | CH341_BIT_RTS);
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
ch341_set_handshake(port->serial->dev, priv->mcr);
|
|
}
|
|
|
|
/*
|
|
* A subset of all CH34x devices don't support a real break condition and
|
|
* reading CH341_REG_BREAK fails (see also ch341_detect_quirks). This function
|
|
* simulates a break condition by lowering the baud rate to the minimum
|
|
* supported by the hardware upon enabling the break condition and sending
|
|
* a NUL byte.
|
|
*
|
|
* Incoming data is corrupted while the break condition is being simulated.
|
|
*
|
|
* Normally the duration of the break condition can be controlled individually
|
|
* by userspace using TIOCSBRK and TIOCCBRK or by passing an argument to
|
|
* TCSBRKP. Due to how the simulation is implemented the duration can't be
|
|
* controlled. The duration is always about (1s / 46bd * 9bit) = 196ms.
|
|
*/
|
|
static void ch341_simulate_break(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
unsigned long now, delay;
|
|
int r;
|
|
|
|
if (break_state != 0) {
|
|
dev_dbg(&port->dev, "enter break state requested\n");
|
|
|
|
r = ch341_set_baudrate_lcr(port->serial->dev, priv,
|
|
CH341_MIN_BPS,
|
|
CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX | CH341_LCR_CS8);
|
|
if (r < 0) {
|
|
dev_err(&port->dev,
|
|
"failed to change baud rate to %u: %d\n",
|
|
CH341_MIN_BPS, r);
|
|
goto restore;
|
|
}
|
|
|
|
r = tty_put_char(tty, '\0');
|
|
if (r < 0) {
|
|
dev_err(&port->dev,
|
|
"failed to write NUL byte for simulated break condition: %d\n",
|
|
r);
|
|
goto restore;
|
|
}
|
|
|
|
/*
|
|
* Compute expected transmission duration including safety
|
|
* margin. The original baud rate is only restored after the
|
|
* computed point in time.
|
|
*
|
|
* 11 bits = 1 start, 8 data, 1 stop, 1 margin
|
|
*/
|
|
priv->break_end = jiffies + (11 * HZ / CH341_MIN_BPS);
|
|
|
|
return;
|
|
}
|
|
|
|
dev_dbg(&port->dev, "leave break state requested\n");
|
|
|
|
now = jiffies;
|
|
|
|
if (time_before(now, priv->break_end)) {
|
|
/* Wait until NUL byte is written */
|
|
delay = priv->break_end - now;
|
|
dev_dbg(&port->dev,
|
|
"wait %d ms while transmitting NUL byte at %u baud\n",
|
|
jiffies_to_msecs(delay), CH341_MIN_BPS);
|
|
schedule_timeout_interruptible(delay);
|
|
}
|
|
|
|
restore:
|
|
/* Restore original baud rate */
|
|
r = ch341_set_baudrate_lcr(port->serial->dev, priv, priv->baud_rate,
|
|
priv->lcr);
|
|
if (r < 0)
|
|
dev_err(&port->dev,
|
|
"restoring original baud rate of %u failed: %d\n",
|
|
priv->baud_rate, r);
|
|
}
|
|
|
|
static void ch341_break_ctl(struct tty_struct *tty, int break_state)
|
|
{
|
|
const uint16_t ch341_break_reg =
|
|
((uint16_t) CH341_REG_LCR << 8) | CH341_REG_BREAK;
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
int r;
|
|
uint16_t reg_contents;
|
|
uint8_t *break_reg;
|
|
|
|
if (priv->quirks & CH341_QUIRK_SIMULATE_BREAK) {
|
|
ch341_simulate_break(tty, break_state);
|
|
return;
|
|
}
|
|
|
|
break_reg = kmalloc(2, GFP_KERNEL);
|
|
if (!break_reg)
|
|
return;
|
|
|
|
r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG,
|
|
ch341_break_reg, 0, break_reg, 2);
|
|
if (r < 0) {
|
|
dev_err(&port->dev, "%s - USB control read error (%d)\n",
|
|
__func__, r);
|
|
goto out;
|
|
}
|
|
dev_dbg(&port->dev, "%s - initial ch341 break register contents - reg1: %x, reg2: %x\n",
|
|
__func__, break_reg[0], break_reg[1]);
|
|
if (break_state != 0) {
|
|
dev_dbg(&port->dev, "%s - Enter break state requested\n", __func__);
|
|
break_reg[0] &= ~CH341_NBREAK_BITS;
|
|
break_reg[1] &= ~CH341_LCR_ENABLE_TX;
|
|
} else {
|
|
dev_dbg(&port->dev, "%s - Leave break state requested\n", __func__);
|
|
break_reg[0] |= CH341_NBREAK_BITS;
|
|
break_reg[1] |= CH341_LCR_ENABLE_TX;
|
|
}
|
|
dev_dbg(&port->dev, "%s - New ch341 break register contents - reg1: %x, reg2: %x\n",
|
|
__func__, break_reg[0], break_reg[1]);
|
|
reg_contents = get_unaligned_le16(break_reg);
|
|
r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG,
|
|
ch341_break_reg, reg_contents);
|
|
if (r < 0)
|
|
dev_err(&port->dev, "%s - USB control write error (%d)\n",
|
|
__func__, r);
|
|
out:
|
|
kfree(break_reg);
|
|
}
|
|
|
|
static int ch341_tiocmset(struct tty_struct *tty,
|
|
unsigned int set, unsigned int clear)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
unsigned long flags;
|
|
u8 control;
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
if (set & TIOCM_RTS)
|
|
priv->mcr |= CH341_BIT_RTS;
|
|
if (set & TIOCM_DTR)
|
|
priv->mcr |= CH341_BIT_DTR;
|
|
if (clear & TIOCM_RTS)
|
|
priv->mcr &= ~CH341_BIT_RTS;
|
|
if (clear & TIOCM_DTR)
|
|
priv->mcr &= ~CH341_BIT_DTR;
|
|
control = priv->mcr;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
return ch341_set_handshake(port->serial->dev, control);
|
|
}
|
|
|
|
static void ch341_update_status(struct usb_serial_port *port,
|
|
unsigned char *data, size_t len)
|
|
{
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
struct tty_struct *tty;
|
|
unsigned long flags;
|
|
u8 status;
|
|
u8 delta;
|
|
|
|
if (len < 4)
|
|
return;
|
|
|
|
status = ~data[2] & CH341_BITS_MODEM_STAT;
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
delta = status ^ priv->msr;
|
|
priv->msr = status;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
if (data[1] & CH341_MULT_STAT)
|
|
dev_dbg(&port->dev, "%s - multiple status change\n", __func__);
|
|
|
|
if (!delta)
|
|
return;
|
|
|
|
if (delta & CH341_BIT_CTS)
|
|
port->icount.cts++;
|
|
if (delta & CH341_BIT_DSR)
|
|
port->icount.dsr++;
|
|
if (delta & CH341_BIT_RI)
|
|
port->icount.rng++;
|
|
if (delta & CH341_BIT_DCD) {
|
|
port->icount.dcd++;
|
|
tty = tty_port_tty_get(&port->port);
|
|
if (tty) {
|
|
usb_serial_handle_dcd_change(port, tty,
|
|
status & CH341_BIT_DCD);
|
|
tty_kref_put(tty);
|
|
}
|
|
}
|
|
|
|
wake_up_interruptible(&port->port.delta_msr_wait);
|
|
}
|
|
|
|
static void ch341_read_int_callback(struct urb *urb)
|
|
{
|
|
struct usb_serial_port *port = urb->context;
|
|
unsigned char *data = urb->transfer_buffer;
|
|
unsigned int len = urb->actual_length;
|
|
int status;
|
|
|
|
switch (urb->status) {
|
|
case 0:
|
|
/* success */
|
|
break;
|
|
case -ECONNRESET:
|
|
case -ENOENT:
|
|
case -ESHUTDOWN:
|
|
/* this urb is terminated, clean up */
|
|
dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
|
|
__func__, urb->status);
|
|
return;
|
|
default:
|
|
dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
|
|
__func__, urb->status);
|
|
goto exit;
|
|
}
|
|
|
|
usb_serial_debug_data(&port->dev, __func__, len, data);
|
|
ch341_update_status(port, data, len);
|
|
exit:
|
|
status = usb_submit_urb(urb, GFP_ATOMIC);
|
|
if (status) {
|
|
dev_err(&urb->dev->dev, "%s - usb_submit_urb failed: %d\n",
|
|
__func__, status);
|
|
}
|
|
}
|
|
|
|
static int ch341_tiocmget(struct tty_struct *tty)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
struct ch341_private *priv = usb_get_serial_port_data(port);
|
|
unsigned long flags;
|
|
u8 mcr;
|
|
u8 status;
|
|
unsigned int result;
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
mcr = priv->mcr;
|
|
status = priv->msr;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
result = ((mcr & CH341_BIT_DTR) ? TIOCM_DTR : 0)
|
|
| ((mcr & CH341_BIT_RTS) ? TIOCM_RTS : 0)
|
|
| ((status & CH341_BIT_CTS) ? TIOCM_CTS : 0)
|
|
| ((status & CH341_BIT_DSR) ? TIOCM_DSR : 0)
|
|
| ((status & CH341_BIT_RI) ? TIOCM_RI : 0)
|
|
| ((status & CH341_BIT_DCD) ? TIOCM_CD : 0);
|
|
|
|
dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
|
|
|
|
return result;
|
|
}
|
|
|
|
static int ch341_reset_resume(struct usb_serial *serial)
|
|
{
|
|
struct usb_serial_port *port = serial->port[0];
|
|
struct ch341_private *priv;
|
|
int ret;
|
|
|
|
priv = usb_get_serial_port_data(port);
|
|
if (!priv)
|
|
return 0;
|
|
|
|
/* reconfigure ch341 serial port after bus-reset */
|
|
ch341_configure(serial->dev, priv);
|
|
|
|
if (tty_port_initialized(&port->port)) {
|
|
ret = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
|
|
if (ret) {
|
|
dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = ch341_get_status(port->serial->dev, priv);
|
|
if (ret < 0) {
|
|
dev_err(&port->dev, "failed to read modem status: %d\n",
|
|
ret);
|
|
}
|
|
}
|
|
|
|
return usb_serial_generic_resume(serial);
|
|
}
|
|
|
|
static struct usb_serial_driver ch341_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ch341-uart",
|
|
},
|
|
.id_table = id_table,
|
|
.num_ports = 1,
|
|
.open = ch341_open,
|
|
.dtr_rts = ch341_dtr_rts,
|
|
.carrier_raised = ch341_carrier_raised,
|
|
.close = ch341_close,
|
|
.set_termios = ch341_set_termios,
|
|
.break_ctl = ch341_break_ctl,
|
|
.tiocmget = ch341_tiocmget,
|
|
.tiocmset = ch341_tiocmset,
|
|
.tiocmiwait = usb_serial_generic_tiocmiwait,
|
|
.read_int_callback = ch341_read_int_callback,
|
|
.port_probe = ch341_port_probe,
|
|
.port_remove = ch341_port_remove,
|
|
.reset_resume = ch341_reset_resume,
|
|
};
|
|
|
|
static struct usb_serial_driver * const serial_drivers[] = {
|
|
&ch341_device, NULL
|
|
};
|
|
|
|
module_usb_serial_driver(serial_drivers, id_table);
|
|
|
|
MODULE_LICENSE("GPL v2");
|