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linux/drivers/usb/serial/mxu11x0.c
Mathieu OTHACEHE 028635d6b5 USB: mxu11x0: fix memory leak on usb_serial private data 
On nominal execution, private data allocated on port_probe and attach
are never freed. Add port_remove and release callbacks to free them
respectively.

Signed-off-by: Mathieu OTHACEHE <m.othacehe@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
2016-01-25 12:47:47 +01:00

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24 KiB
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/*
* USB Moxa UPORT 11x0 Serial Driver
*
* Copyright (C) 2007 MOXA Technologies Co., Ltd.
* Copyright (C) 2015 Mathieu Othacehe <m.othacehe@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*
* Supports the following Moxa USB to serial converters:
* UPort 1110, 1 port RS-232 USB to Serial Hub.
* UPort 1130, 1 port RS-422/485 USB to Serial Hub.
* UPort 1130I, 1 port RS-422/485 USB to Serial Hub with isolation
* protection.
* UPort 1150, 1 port RS-232/422/485 USB to Serial Hub.
* UPort 1150I, 1 port RS-232/422/485 USB to Serial Hub with isolation
* protection.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/firmware.h>
#include <linux/jiffies.h>
#include <linux/serial.h>
#include <linux/serial_reg.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
/* Vendor and product ids */
#define MXU1_VENDOR_ID 0x110a
#define MXU1_1110_PRODUCT_ID 0x1110
#define MXU1_1130_PRODUCT_ID 0x1130
#define MXU1_1150_PRODUCT_ID 0x1150
#define MXU1_1151_PRODUCT_ID 0x1151
#define MXU1_1131_PRODUCT_ID 0x1131
/* Commands */
#define MXU1_GET_VERSION 0x01
#define MXU1_GET_PORT_STATUS 0x02
#define MXU1_GET_PORT_DEV_INFO 0x03
#define MXU1_GET_CONFIG 0x04
#define MXU1_SET_CONFIG 0x05
#define MXU1_OPEN_PORT 0x06
#define MXU1_CLOSE_PORT 0x07
#define MXU1_START_PORT 0x08
#define MXU1_STOP_PORT 0x09
#define MXU1_TEST_PORT 0x0A
#define MXU1_PURGE_PORT 0x0B
#define MXU1_RESET_EXT_DEVICE 0x0C
#define MXU1_GET_OUTQUEUE 0x0D
#define MXU1_WRITE_DATA 0x80
#define MXU1_READ_DATA 0x81
#define MXU1_REQ_TYPE_CLASS 0x82
/* Module identifiers */
#define MXU1_I2C_PORT 0x01
#define MXU1_IEEE1284_PORT 0x02
#define MXU1_UART1_PORT 0x03
#define MXU1_UART2_PORT 0x04
#define MXU1_RAM_PORT 0x05
/* Modem status */
#define MXU1_MSR_DELTA_CTS 0x01
#define MXU1_MSR_DELTA_DSR 0x02
#define MXU1_MSR_DELTA_RI 0x04
#define MXU1_MSR_DELTA_CD 0x08
#define MXU1_MSR_CTS 0x10
#define MXU1_MSR_DSR 0x20
#define MXU1_MSR_RI 0x40
#define MXU1_MSR_CD 0x80
#define MXU1_MSR_DELTA_MASK 0x0F
#define MXU1_MSR_MASK 0xF0
/* Line status */
#define MXU1_LSR_OVERRUN_ERROR 0x01
#define MXU1_LSR_PARITY_ERROR 0x02
#define MXU1_LSR_FRAMING_ERROR 0x04
#define MXU1_LSR_BREAK 0x08
#define MXU1_LSR_ERROR 0x0F
#define MXU1_LSR_RX_FULL 0x10
#define MXU1_LSR_TX_EMPTY 0x20
/* Modem control */
#define MXU1_MCR_LOOP 0x04
#define MXU1_MCR_DTR 0x10
#define MXU1_MCR_RTS 0x20
/* Mask settings */
#define MXU1_UART_ENABLE_RTS_IN 0x0001
#define MXU1_UART_DISABLE_RTS 0x0002
#define MXU1_UART_ENABLE_PARITY_CHECKING 0x0008
#define MXU1_UART_ENABLE_DSR_OUT 0x0010
#define MXU1_UART_ENABLE_CTS_OUT 0x0020
#define MXU1_UART_ENABLE_X_OUT 0x0040
#define MXU1_UART_ENABLE_XA_OUT 0x0080
#define MXU1_UART_ENABLE_X_IN 0x0100
#define MXU1_UART_ENABLE_DTR_IN 0x0800
#define MXU1_UART_DISABLE_DTR 0x1000
#define MXU1_UART_ENABLE_MS_INTS 0x2000
#define MXU1_UART_ENABLE_AUTO_START_DMA 0x4000
#define MXU1_UART_SEND_BREAK_SIGNAL 0x8000
/* Parity */
#define MXU1_UART_NO_PARITY 0x00
#define MXU1_UART_ODD_PARITY 0x01
#define MXU1_UART_EVEN_PARITY 0x02
#define MXU1_UART_MARK_PARITY 0x03
#define MXU1_UART_SPACE_PARITY 0x04
/* Stop bits */
#define MXU1_UART_1_STOP_BITS 0x00
#define MXU1_UART_1_5_STOP_BITS 0x01
#define MXU1_UART_2_STOP_BITS 0x02
/* Bits per character */
#define MXU1_UART_5_DATA_BITS 0x00
#define MXU1_UART_6_DATA_BITS 0x01
#define MXU1_UART_7_DATA_BITS 0x02
#define MXU1_UART_8_DATA_BITS 0x03
/* Operation modes */
#define MXU1_UART_232 0x00
#define MXU1_UART_485_RECEIVER_DISABLED 0x01
#define MXU1_UART_485_RECEIVER_ENABLED 0x02
/* Pipe transfer mode and timeout */
#define MXU1_PIPE_MODE_CONTINUOUS 0x01
#define MXU1_PIPE_MODE_MASK 0x03
#define MXU1_PIPE_TIMEOUT_MASK 0x7C
#define MXU1_PIPE_TIMEOUT_ENABLE 0x80
/* Config struct */
struct mxu1_uart_config {
__be16 wBaudRate;
__be16 wFlags;
u8 bDataBits;
u8 bParity;
u8 bStopBits;
char cXon;
char cXoff;
u8 bUartMode;
} __packed;
/* Purge modes */
#define MXU1_PURGE_OUTPUT 0x00
#define MXU1_PURGE_INPUT 0x80
/* Read/Write data */
#define MXU1_RW_DATA_ADDR_SFR 0x10
#define MXU1_RW_DATA_ADDR_IDATA 0x20
#define MXU1_RW_DATA_ADDR_XDATA 0x30
#define MXU1_RW_DATA_ADDR_CODE 0x40
#define MXU1_RW_DATA_ADDR_GPIO 0x50
#define MXU1_RW_DATA_ADDR_I2C 0x60
#define MXU1_RW_DATA_ADDR_FLASH 0x70
#define MXU1_RW_DATA_ADDR_DSP 0x80
#define MXU1_RW_DATA_UNSPECIFIED 0x00
#define MXU1_RW_DATA_BYTE 0x01
#define MXU1_RW_DATA_WORD 0x02
#define MXU1_RW_DATA_DOUBLE_WORD 0x04
struct mxu1_write_data_bytes {
u8 bAddrType;
u8 bDataType;
u8 bDataCounter;
__be16 wBaseAddrHi;
__be16 wBaseAddrLo;
u8 bData[0];
} __packed;
/* Interrupt codes */
#define MXU1_CODE_HARDWARE_ERROR 0xFF
#define MXU1_CODE_DATA_ERROR 0x03
#define MXU1_CODE_MODEM_STATUS 0x04
static inline int mxu1_get_func_from_code(unsigned char code)
{
return code & 0x0f;
}
/* Download firmware max packet size */
#define MXU1_DOWNLOAD_MAX_PACKET_SIZE 64
/* Firmware image header */
struct mxu1_firmware_header {
__le16 wLength;
u8 bCheckSum;
} __packed;
#define MXU1_UART_BASE_ADDR 0xFFA0
#define MXU1_UART_OFFSET_MCR 0x0004
#define MXU1_BAUD_BASE 923077
#define MXU1_TRANSFER_TIMEOUT 2
#define MXU1_DOWNLOAD_TIMEOUT 1000
#define MXU1_DEFAULT_CLOSING_WAIT 4000 /* in .01 secs */
struct mxu1_port {
u8 msr;
u8 mcr;
u8 uart_mode;
spinlock_t spinlock; /* Protects msr */
struct mutex mutex; /* Protects mcr */
bool send_break;
};
struct mxu1_device {
u16 mxd_model;
};
static const struct usb_device_id mxu1_idtable[] = {
{ USB_DEVICE(MXU1_VENDOR_ID, MXU1_1110_PRODUCT_ID) },
{ USB_DEVICE(MXU1_VENDOR_ID, MXU1_1130_PRODUCT_ID) },
{ USB_DEVICE(MXU1_VENDOR_ID, MXU1_1150_PRODUCT_ID) },
{ USB_DEVICE(MXU1_VENDOR_ID, MXU1_1151_PRODUCT_ID) },
{ USB_DEVICE(MXU1_VENDOR_ID, MXU1_1131_PRODUCT_ID) },
{ }
};
MODULE_DEVICE_TABLE(usb, mxu1_idtable);
/* Write the given buffer out to the control pipe. */
static int mxu1_send_ctrl_data_urb(struct usb_serial *serial,
u8 request,
u16 value, u16 index,
void *data, size_t size)
{
int status;
status = usb_control_msg(serial->dev,
usb_sndctrlpipe(serial->dev, 0),
request,
(USB_DIR_OUT | USB_TYPE_VENDOR |
USB_RECIP_DEVICE), value, index,
data, size,
USB_CTRL_SET_TIMEOUT);
if (status < 0) {
dev_err(&serial->interface->dev,
"%s - usb_control_msg failed: %d\n",
__func__, status);
return status;
}
if (status != size) {
dev_err(&serial->interface->dev,
"%s - short write (%d / %zd)\n",
__func__, status, size);
return -EIO;
}
return 0;
}
/* Send a vendor request without any data */
static int mxu1_send_ctrl_urb(struct usb_serial *serial,
u8 request, u16 value, u16 index)
{
return mxu1_send_ctrl_data_urb(serial, request, value, index,
NULL, 0);
}
static int mxu1_download_firmware(struct usb_serial *serial,
const struct firmware *fw_p)
{
int status = 0;
int buffer_size;
int pos;
int len;
int done;
u8 cs = 0;
u8 *buffer;
struct usb_device *dev = serial->dev;
struct mxu1_firmware_header *header;
unsigned int pipe;
pipe = usb_sndbulkpipe(dev, serial->port[0]->bulk_out_endpointAddress);
buffer_size = fw_p->size + sizeof(*header);
buffer = kmalloc(buffer_size, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
memcpy(buffer, fw_p->data, fw_p->size);
memset(buffer + fw_p->size, 0xff, buffer_size - fw_p->size);
for (pos = sizeof(*header); pos < buffer_size; pos++)
cs = (u8)(cs + buffer[pos]);
header = (struct mxu1_firmware_header *)buffer;
header->wLength = cpu_to_le16(buffer_size - sizeof(*header));
header->bCheckSum = cs;
dev_dbg(&dev->dev, "%s - downloading firmware\n", __func__);
for (pos = 0; pos < buffer_size; pos += done) {
len = min(buffer_size - pos, MXU1_DOWNLOAD_MAX_PACKET_SIZE);
status = usb_bulk_msg(dev, pipe, buffer + pos, len, &done,
MXU1_DOWNLOAD_TIMEOUT);
if (status)
break;
}
kfree(buffer);
if (status) {
dev_err(&dev->dev, "failed to download firmware: %d\n", status);
return status;
}
msleep_interruptible(100);
usb_reset_device(dev);
dev_dbg(&dev->dev, "%s - download successful\n", __func__);
return 0;
}
static int mxu1_port_probe(struct usb_serial_port *port)
{
struct mxu1_port *mxport;
struct mxu1_device *mxdev;
if (!port->interrupt_in_urb) {
dev_err(&port->dev, "no interrupt urb\n");
return -ENODEV;
}
mxport = kzalloc(sizeof(struct mxu1_port), GFP_KERNEL);
if (!mxport)
return -ENOMEM;
spin_lock_init(&mxport->spinlock);
mutex_init(&mxport->mutex);
mxdev = usb_get_serial_data(port->serial);
switch (mxdev->mxd_model) {
case MXU1_1110_PRODUCT_ID:
case MXU1_1150_PRODUCT_ID:
case MXU1_1151_PRODUCT_ID:
mxport->uart_mode = MXU1_UART_232;
break;
case MXU1_1130_PRODUCT_ID:
case MXU1_1131_PRODUCT_ID:
mxport->uart_mode = MXU1_UART_485_RECEIVER_DISABLED;
break;
}
usb_set_serial_port_data(port, mxport);
port->port.closing_wait =
msecs_to_jiffies(MXU1_DEFAULT_CLOSING_WAIT * 10);
port->port.drain_delay = 1;
return 0;
}
static int mxu1_port_remove(struct usb_serial_port *port)
{
struct mxu1_port *mxport;
mxport = usb_get_serial_port_data(port);
kfree(mxport);
return 0;
}
static int mxu1_startup(struct usb_serial *serial)
{
struct mxu1_device *mxdev;
struct usb_device *dev = serial->dev;
struct usb_host_interface *cur_altsetting;
char fw_name[32];
const struct firmware *fw_p = NULL;
int err;
dev_dbg(&serial->interface->dev, "%s - product 0x%04X, num configurations %d, configuration value %d\n",
__func__, le16_to_cpu(dev->descriptor.idProduct),
dev->descriptor.bNumConfigurations,
dev->actconfig->desc.bConfigurationValue);
/* create device structure */
mxdev = kzalloc(sizeof(struct mxu1_device), GFP_KERNEL);
if (!mxdev)
return -ENOMEM;
usb_set_serial_data(serial, mxdev);
mxdev->mxd_model = le16_to_cpu(dev->descriptor.idProduct);
cur_altsetting = serial->interface->cur_altsetting;
/* if we have only 1 configuration, download firmware */
if (cur_altsetting->desc.bNumEndpoints == 1) {
snprintf(fw_name,
sizeof(fw_name),
"moxa/moxa-%04x.fw",
mxdev->mxd_model);
err = request_firmware(&fw_p, fw_name, &serial->interface->dev);
if (err) {
dev_err(&serial->interface->dev, "failed to request firmware: %d\n",
err);
goto err_free_mxdev;
}
err = mxu1_download_firmware(serial, fw_p);
if (err)
goto err_release_firmware;
/* device is being reset */
err = -ENODEV;
goto err_release_firmware;
}
return 0;
err_release_firmware:
release_firmware(fw_p);
err_free_mxdev:
kfree(mxdev);
return err;
}
static void mxu1_release(struct usb_serial *serial)
{
struct mxu1_device *mxdev;
mxdev = usb_get_serial_data(serial);
kfree(mxdev);
}
static int mxu1_write_byte(struct usb_serial_port *port, u32 addr,
u8 mask, u8 byte)
{
int status;
size_t size;
struct mxu1_write_data_bytes *data;
dev_dbg(&port->dev, "%s - addr 0x%08X, mask 0x%02X, byte 0x%02X\n",
__func__, addr, mask, byte);
size = sizeof(struct mxu1_write_data_bytes) + 2;
data = kzalloc(size, GFP_KERNEL);
if (!data)
return -ENOMEM;
data->bAddrType = MXU1_RW_DATA_ADDR_XDATA;
data->bDataType = MXU1_RW_DATA_BYTE;
data->bDataCounter = 1;
data->wBaseAddrHi = cpu_to_be16(addr >> 16);
data->wBaseAddrLo = cpu_to_be16(addr);
data->bData[0] = mask;
data->bData[1] = byte;
status = mxu1_send_ctrl_data_urb(port->serial, MXU1_WRITE_DATA, 0,
MXU1_RAM_PORT, data, size);
if (status < 0)
dev_err(&port->dev, "%s - failed: %d\n", __func__, status);
kfree(data);
return status;
}
static int mxu1_set_mcr(struct usb_serial_port *port, unsigned int mcr)
{
int status;
status = mxu1_write_byte(port,
MXU1_UART_BASE_ADDR + MXU1_UART_OFFSET_MCR,
MXU1_MCR_RTS | MXU1_MCR_DTR | MXU1_MCR_LOOP,
mcr);
return status;
}
static void mxu1_set_termios(struct tty_struct *tty,
struct usb_serial_port *port,
struct ktermios *old_termios)
{
struct mxu1_port *mxport = usb_get_serial_port_data(port);
struct mxu1_uart_config *config;
tcflag_t cflag, iflag;
speed_t baud;
int status;
unsigned int mcr;
cflag = tty->termios.c_cflag;
iflag = tty->termios.c_iflag;
if (old_termios &&
!tty_termios_hw_change(&tty->termios, old_termios) &&
tty->termios.c_iflag == old_termios->c_iflag) {
dev_dbg(&port->dev, "%s - nothing to change\n", __func__);
return;
}
dev_dbg(&port->dev,
"%s - cflag 0x%08x, iflag 0x%08x\n", __func__, cflag, iflag);
if (old_termios) {
dev_dbg(&port->dev, "%s - old cflag 0x%08x, old iflag 0x%08x\n",
__func__,
old_termios->c_cflag,
old_termios->c_iflag);
}
config = kzalloc(sizeof(*config), GFP_KERNEL);
if (!config)
return;
/* these flags must be set */
config->wFlags |= MXU1_UART_ENABLE_MS_INTS;
config->wFlags |= MXU1_UART_ENABLE_AUTO_START_DMA;
if (mxport->send_break)
config->wFlags |= MXU1_UART_SEND_BREAK_SIGNAL;
config->bUartMode = mxport->uart_mode;
switch (C_CSIZE(tty)) {
case CS5:
config->bDataBits = MXU1_UART_5_DATA_BITS;
break;
case CS6:
config->bDataBits = MXU1_UART_6_DATA_BITS;
break;
case CS7:
config->bDataBits = MXU1_UART_7_DATA_BITS;
break;
default:
case CS8:
config->bDataBits = MXU1_UART_8_DATA_BITS;
break;
}
if (C_PARENB(tty)) {
config->wFlags |= MXU1_UART_ENABLE_PARITY_CHECKING;
if (C_CMSPAR(tty)) {
if (C_PARODD(tty))
config->bParity = MXU1_UART_MARK_PARITY;
else
config->bParity = MXU1_UART_SPACE_PARITY;
} else {
if (C_PARODD(tty))
config->bParity = MXU1_UART_ODD_PARITY;
else
config->bParity = MXU1_UART_EVEN_PARITY;
}
} else {
config->bParity = MXU1_UART_NO_PARITY;
}
if (C_CSTOPB(tty))
config->bStopBits = MXU1_UART_2_STOP_BITS;
else
config->bStopBits = MXU1_UART_1_STOP_BITS;
if (C_CRTSCTS(tty)) {
/* RTS flow control must be off to drop RTS for baud rate B0 */
if (C_BAUD(tty) != B0)
config->wFlags |= MXU1_UART_ENABLE_RTS_IN;
config->wFlags |= MXU1_UART_ENABLE_CTS_OUT;
}
if (I_IXOFF(tty) || I_IXON(tty)) {
config->cXon = START_CHAR(tty);
config->cXoff = STOP_CHAR(tty);
if (I_IXOFF(tty))
config->wFlags |= MXU1_UART_ENABLE_X_IN;
if (I_IXON(tty))
config->wFlags |= MXU1_UART_ENABLE_X_OUT;
}
baud = tty_get_baud_rate(tty);
if (!baud)
baud = 9600;
config->wBaudRate = MXU1_BAUD_BASE / baud;
dev_dbg(&port->dev, "%s - BaudRate=%d, wBaudRate=%d, wFlags=0x%04X, bDataBits=%d, bParity=%d, bStopBits=%d, cXon=%d, cXoff=%d, bUartMode=%d\n",
__func__, baud, config->wBaudRate, config->wFlags,
config->bDataBits, config->bParity, config->bStopBits,
config->cXon, config->cXoff, config->bUartMode);
cpu_to_be16s(&config->wBaudRate);
cpu_to_be16s(&config->wFlags);
status = mxu1_send_ctrl_data_urb(port->serial, MXU1_SET_CONFIG, 0,
MXU1_UART1_PORT, config,
sizeof(*config));
if (status)
dev_err(&port->dev, "cannot set config: %d\n", status);
mutex_lock(&mxport->mutex);
mcr = mxport->mcr;
if (C_BAUD(tty) == B0)
mcr &= ~(MXU1_MCR_DTR | MXU1_MCR_RTS);
else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
mcr |= MXU1_MCR_DTR | MXU1_MCR_RTS;
status = mxu1_set_mcr(port, mcr);
if (status)
dev_err(&port->dev, "cannot set modem control: %d\n", status);
else
mxport->mcr = mcr;
mutex_unlock(&mxport->mutex);
kfree(config);
}
static int mxu1_get_serial_info(struct usb_serial_port *port,
struct serial_struct __user *ret_arg)
{
struct serial_struct ret_serial;
unsigned cwait;
if (!ret_arg)
return -EFAULT;
cwait = port->port.closing_wait;
if (cwait != ASYNC_CLOSING_WAIT_NONE)
cwait = jiffies_to_msecs(cwait) / 10;
memset(&ret_serial, 0, sizeof(ret_serial));
ret_serial.type = PORT_16550A;
ret_serial.line = port->minor;
ret_serial.port = 0;
ret_serial.xmit_fifo_size = port->bulk_out_size;
ret_serial.baud_base = MXU1_BAUD_BASE;
ret_serial.close_delay = 5*HZ;
ret_serial.closing_wait = cwait;
if (copy_to_user(ret_arg, &ret_serial, sizeof(*ret_arg)))
return -EFAULT;
return 0;
}
static int mxu1_set_serial_info(struct usb_serial_port *port,
struct serial_struct __user *new_arg)
{
struct serial_struct new_serial;
unsigned cwait;
if (copy_from_user(&new_serial, new_arg, sizeof(new_serial)))
return -EFAULT;
cwait = new_serial.closing_wait;
if (cwait != ASYNC_CLOSING_WAIT_NONE)
cwait = msecs_to_jiffies(10 * new_serial.closing_wait);
port->port.closing_wait = cwait;
return 0;
}
static int mxu1_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
switch (cmd) {
case TIOCGSERIAL:
return mxu1_get_serial_info(port,
(struct serial_struct __user *)arg);
case TIOCSSERIAL:
return mxu1_set_serial_info(port,
(struct serial_struct __user *)arg);
}
return -ENOIOCTLCMD;
}
static int mxu1_tiocmget(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct mxu1_port *mxport = usb_get_serial_port_data(port);
unsigned int result;
unsigned int msr;
unsigned int mcr;
unsigned long flags;
mutex_lock(&mxport->mutex);
spin_lock_irqsave(&mxport->spinlock, flags);
msr = mxport->msr;
mcr = mxport->mcr;
spin_unlock_irqrestore(&mxport->spinlock, flags);
mutex_unlock(&mxport->mutex);
result = ((mcr & MXU1_MCR_DTR) ? TIOCM_DTR : 0) |
((mcr & MXU1_MCR_RTS) ? TIOCM_RTS : 0) |
((mcr & MXU1_MCR_LOOP) ? TIOCM_LOOP : 0) |
((msr & MXU1_MSR_CTS) ? TIOCM_CTS : 0) |
((msr & MXU1_MSR_CD) ? TIOCM_CAR : 0) |
((msr & MXU1_MSR_RI) ? TIOCM_RI : 0) |
((msr & MXU1_MSR_DSR) ? TIOCM_DSR : 0);
dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
return result;
}
static int mxu1_tiocmset(struct tty_struct *tty,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct mxu1_port *mxport = usb_get_serial_port_data(port);
int err;
unsigned int mcr;
mutex_lock(&mxport->mutex);
mcr = mxport->mcr;
if (set & TIOCM_RTS)
mcr |= MXU1_MCR_RTS;
if (set & TIOCM_DTR)
mcr |= MXU1_MCR_DTR;
if (set & TIOCM_LOOP)
mcr |= MXU1_MCR_LOOP;
if (clear & TIOCM_RTS)
mcr &= ~MXU1_MCR_RTS;
if (clear & TIOCM_DTR)
mcr &= ~MXU1_MCR_DTR;
if (clear & TIOCM_LOOP)
mcr &= ~MXU1_MCR_LOOP;
err = mxu1_set_mcr(port, mcr);
if (!err)
mxport->mcr = mcr;
mutex_unlock(&mxport->mutex);
return err;
}
static void mxu1_break(struct tty_struct *tty, int break_state)
{
struct usb_serial_port *port = tty->driver_data;
struct mxu1_port *mxport = usb_get_serial_port_data(port);
if (break_state == -1)
mxport->send_break = true;
else
mxport->send_break = false;
mxu1_set_termios(tty, port, NULL);
}
static int mxu1_open(struct tty_struct *tty, struct usb_serial_port *port)
{
struct mxu1_port *mxport = usb_get_serial_port_data(port);
struct usb_serial *serial = port->serial;
int status;
u16 open_settings;
open_settings = (MXU1_PIPE_MODE_CONTINUOUS |
MXU1_PIPE_TIMEOUT_ENABLE |
(MXU1_TRANSFER_TIMEOUT << 2));
mxport->msr = 0;
status = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
if (status) {
dev_err(&port->dev, "failed to submit interrupt urb: %d\n",
status);
return status;
}
if (tty)
mxu1_set_termios(tty, port, NULL);
status = mxu1_send_ctrl_urb(serial, MXU1_OPEN_PORT,
open_settings, MXU1_UART1_PORT);
if (status) {
dev_err(&port->dev, "cannot send open command: %d\n", status);
goto unlink_int_urb;
}
status = mxu1_send_ctrl_urb(serial, MXU1_START_PORT,
0, MXU1_UART1_PORT);
if (status) {
dev_err(&port->dev, "cannot send start command: %d\n", status);
goto unlink_int_urb;
}
status = mxu1_send_ctrl_urb(serial, MXU1_PURGE_PORT,
MXU1_PURGE_INPUT, MXU1_UART1_PORT);
if (status) {
dev_err(&port->dev, "cannot clear input buffers: %d\n",
status);
goto unlink_int_urb;
}
status = mxu1_send_ctrl_urb(serial, MXU1_PURGE_PORT,
MXU1_PURGE_OUTPUT, MXU1_UART1_PORT);
if (status) {
dev_err(&port->dev, "cannot clear output buffers: %d\n",
status);
goto unlink_int_urb;
}
/*
* reset the data toggle on the bulk endpoints to work around bug in
* host controllers where things get out of sync some times
*/
usb_clear_halt(serial->dev, port->write_urb->pipe);
usb_clear_halt(serial->dev, port->read_urb->pipe);
if (tty)
mxu1_set_termios(tty, port, NULL);
status = mxu1_send_ctrl_urb(serial, MXU1_OPEN_PORT,
open_settings, MXU1_UART1_PORT);
if (status) {
dev_err(&port->dev, "cannot send open command: %d\n", status);
goto unlink_int_urb;
}
status = mxu1_send_ctrl_urb(serial, MXU1_START_PORT,
0, MXU1_UART1_PORT);
if (status) {
dev_err(&port->dev, "cannot send start command: %d\n", status);
goto unlink_int_urb;
}
status = usb_serial_generic_open(tty, port);
if (status)
goto unlink_int_urb;
return 0;
unlink_int_urb:
usb_kill_urb(port->interrupt_in_urb);
return status;
}
static void mxu1_close(struct usb_serial_port *port)
{
int status;
usb_serial_generic_close(port);
usb_kill_urb(port->interrupt_in_urb);
status = mxu1_send_ctrl_urb(port->serial, MXU1_CLOSE_PORT,
0, MXU1_UART1_PORT);
if (status) {
dev_err(&port->dev, "failed to send close port command: %d\n",
status);
}
}
static void mxu1_handle_new_msr(struct usb_serial_port *port, u8 msr)
{
struct mxu1_port *mxport = usb_get_serial_port_data(port);
struct async_icount *icount;
unsigned long flags;
dev_dbg(&port->dev, "%s - msr 0x%02X\n", __func__, msr);
spin_lock_irqsave(&mxport->spinlock, flags);
mxport->msr = msr & MXU1_MSR_MASK;
spin_unlock_irqrestore(&mxport->spinlock, flags);
if (msr & MXU1_MSR_DELTA_MASK) {
icount = &port->icount;
if (msr & MXU1_MSR_DELTA_CTS)
icount->cts++;
if (msr & MXU1_MSR_DELTA_DSR)
icount->dsr++;
if (msr & MXU1_MSR_DELTA_CD)
icount->dcd++;
if (msr & MXU1_MSR_DELTA_RI)
icount->rng++;
wake_up_interruptible(&port->port.delta_msr_wait);
}
}
static void mxu1_interrupt_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
unsigned char *data = urb->transfer_buffer;
int length = urb->actual_length;
int function;
int status;
u8 msr;
switch (urb->status) {
case 0:
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
dev_dbg(&port->dev, "%s - urb shutting down: %d\n",
__func__, urb->status);
return;
default:
dev_dbg(&port->dev, "%s - nonzero urb status: %d\n",
__func__, urb->status);
goto exit;
}
if (length != 2) {
dev_dbg(&port->dev, "%s - bad packet size: %d\n",
__func__, length);
goto exit;
}
if (data[0] == MXU1_CODE_HARDWARE_ERROR) {
dev_err(&port->dev, "hardware error: %d\n", data[1]);
goto exit;
}
function = mxu1_get_func_from_code(data[0]);
dev_dbg(&port->dev, "%s - function %d, data 0x%02X\n",
__func__, function, data[1]);
switch (function) {
case MXU1_CODE_DATA_ERROR:
dev_dbg(&port->dev, "%s - DATA ERROR, data 0x%02X\n",
__func__, data[1]);
break;
case MXU1_CODE_MODEM_STATUS:
msr = data[1];
mxu1_handle_new_msr(port, msr);
break;
default:
dev_err(&port->dev, "unknown interrupt code: 0x%02X\n",
data[1]);
break;
}
exit:
status = usb_submit_urb(urb, GFP_ATOMIC);
if (status) {
dev_err(&port->dev, "resubmit interrupt urb failed: %d\n",
status);
}
}
static struct usb_serial_driver mxu11x0_device = {
.driver = {
.owner = THIS_MODULE,
.name = "mxu11x0",
},
.description = "MOXA UPort 11x0",
.id_table = mxu1_idtable,
.num_ports = 1,
.port_probe = mxu1_port_probe,
.port_remove = mxu1_port_remove,
.attach = mxu1_startup,
.release = mxu1_release,
.open = mxu1_open,
.close = mxu1_close,
.ioctl = mxu1_ioctl,
.set_termios = mxu1_set_termios,
.tiocmget = mxu1_tiocmget,
.tiocmset = mxu1_tiocmset,
.tiocmiwait = usb_serial_generic_tiocmiwait,
.get_icount = usb_serial_generic_get_icount,
.break_ctl = mxu1_break,
.read_int_callback = mxu1_interrupt_callback,
};
static struct usb_serial_driver *const serial_drivers[] = {
&mxu11x0_device, NULL
};
module_usb_serial_driver(serial_drivers, mxu1_idtable);
MODULE_AUTHOR("Mathieu Othacehe <m.othacehe@gmail.com>");
MODULE_DESCRIPTION("MOXA UPort 11x0 USB to Serial Hub Driver");
MODULE_LICENSE("GPL");
MODULE_FIRMWARE("moxa/moxa-1110.fw");
MODULE_FIRMWARE("moxa/moxa-1130.fw");
MODULE_FIRMWARE("moxa/moxa-1131.fw");
MODULE_FIRMWARE("moxa/moxa-1150.fw");
MODULE_FIRMWARE("moxa/moxa-1151.fw");
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