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android_kernel_xiaomi_sm8350/drivers/usb/serial/pl2303.c
Jesper Juhl 1bc3c9e1e4 [PATCH] USB: kfree cleanup for drivers/usb/* - no need to check for NULL 
Get rid of a bunch of redundant NULL pointer checks in drivers/usb/*,
there's no need to check a pointer for NULL before calling kfree() on it.

Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>


Index: gregkh-2.6/drivers/usb/class/audio.c
===================================================================
2005-04-18 17:39:34 -07:00

1222 lines
32 KiB
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/*
* Prolific PL2303 USB to serial adaptor driver
*
* Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2003 IBM Corp.
*
* Original driver for 2.2.x by anonymous
*
* 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.
*
* See Documentation/usb/usb-serial.txt for more information on using this driver
*
* 2002_Mar_26 gkh
* allowed driver to work properly if there is no tty assigned to a port
* (this happens for serial console devices.)
*
* 2001_Oct_06 gkh
* Added RTS and DTR line control. Thanks to joe@bndlg.de for parts of it.
*
* 2001_Sep_19 gkh
* Added break support.
*
* 2001_Aug_30 gkh
* fixed oops in write_bulk_callback.
*
* 2001_Aug_28 gkh
* reworked buffer logic to be like other usb-serial drivers. Hopefully
* removing some reported problems.
*
* 2001_Jun_06 gkh
* finished porting to 2.4 format.
*
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/spinlock.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#include "usb-serial.h"
#include "pl2303.h"
/*
* Version Information
*/
#define DRIVER_VERSION "v0.12"
#define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
static int debug;
#define PL2303_CLOSING_WAIT (30*HZ)
#define PL2303_BUF_SIZE 1024
#define PL2303_TMP_BUF_SIZE 1024
static DECLARE_MUTEX(pl2303_tmp_buf_sem);
struct pl2303_buf {
unsigned int buf_size;
char *buf_buf;
char *buf_get;
char *buf_put;
};
static struct usb_device_id id_table [] = {
{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ3) },
{ USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_PHAROS) },
{ USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
{ USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
{ USB_DEVICE(ATEN_VENDOR_ID2, ATEN_PRODUCT_ID) },
{ USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
{ USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID_UCSGT) },
{ USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
{ USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
{ USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
{ USB_DEVICE(TRIPP_VENDOR_ID, TRIPP_PRODUCT_ID) },
{ USB_DEVICE(RADIOSHACK_VENDOR_ID, RADIOSHACK_PRODUCT_ID) },
{ USB_DEVICE(DCU10_VENDOR_ID, DCU10_PRODUCT_ID) },
{ USB_DEVICE(SITECOM_VENDOR_ID, SITECOM_PRODUCT_ID) },
{ USB_DEVICE(ALCATEL_VENDOR_ID, ALCATEL_PRODUCT_ID) },
{ USB_DEVICE(SAMSUNG_VENDOR_ID, SAMSUNG_PRODUCT_ID) },
{ USB_DEVICE(SIEMENS_VENDOR_ID, SIEMENS_PRODUCT_ID_X65) },
{ USB_DEVICE(SYNTECH_VENDOR_ID, SYNTECH_PRODUCT_ID) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, id_table);
static struct usb_driver pl2303_driver = {
.owner = THIS_MODULE,
.name = "pl2303",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table,
};
#define SET_LINE_REQUEST_TYPE 0x21
#define SET_LINE_REQUEST 0x20
#define SET_CONTROL_REQUEST_TYPE 0x21
#define SET_CONTROL_REQUEST 0x22
#define CONTROL_DTR 0x01
#define CONTROL_RTS 0x02
#define BREAK_REQUEST_TYPE 0x21
#define BREAK_REQUEST 0x23
#define BREAK_ON 0xffff
#define BREAK_OFF 0x0000
#define GET_LINE_REQUEST_TYPE 0xa1
#define GET_LINE_REQUEST 0x21
#define VENDOR_WRITE_REQUEST_TYPE 0x40
#define VENDOR_WRITE_REQUEST 0x01
#define VENDOR_READ_REQUEST_TYPE 0xc0
#define VENDOR_READ_REQUEST 0x01
#define UART_STATE 0x08
#define UART_STATE_TRANSIENT_MASK 0x74
#define UART_DCD 0x01
#define UART_DSR 0x02
#define UART_BREAK_ERROR 0x04
#define UART_RING 0x08
#define UART_FRAME_ERROR 0x10
#define UART_PARITY_ERROR 0x20
#define UART_OVERRUN_ERROR 0x40
#define UART_CTS 0x80
/* function prototypes for a PL2303 serial converter */
static int pl2303_open (struct usb_serial_port *port, struct file *filp);
static void pl2303_close (struct usb_serial_port *port, struct file *filp);
static void pl2303_set_termios (struct usb_serial_port *port,
struct termios *old);
static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
unsigned int cmd, unsigned long arg);
static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
static int pl2303_write (struct usb_serial_port *port,
const unsigned char *buf, int count);
static void pl2303_send (struct usb_serial_port *port);
static int pl2303_write_room(struct usb_serial_port *port);
static int pl2303_chars_in_buffer(struct usb_serial_port *port);
static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file);
static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
unsigned int set, unsigned int clear);
static int pl2303_startup (struct usb_serial *serial);
static void pl2303_shutdown (struct usb_serial *serial);
static struct pl2303_buf *pl2303_buf_alloc(unsigned int size);
static void pl2303_buf_free(struct pl2303_buf *pb);
static void pl2303_buf_clear(struct pl2303_buf *pb);
static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb);
static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb);
static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
unsigned int count);
static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
unsigned int count);
/* All of the device info needed for the PL2303 SIO serial converter */
static struct usb_serial_device_type pl2303_device = {
.owner = THIS_MODULE,
.name = "PL-2303",
.id_table = id_table,
.num_interrupt_in = NUM_DONT_CARE,
.num_bulk_in = 1,
.num_bulk_out = 1,
.num_ports = 1,
.open = pl2303_open,
.close = pl2303_close,
.write = pl2303_write,
.ioctl = pl2303_ioctl,
.break_ctl = pl2303_break_ctl,
.set_termios = pl2303_set_termios,
.tiocmget = pl2303_tiocmget,
.tiocmset = pl2303_tiocmset,
.read_bulk_callback = pl2303_read_bulk_callback,
.read_int_callback = pl2303_read_int_callback,
.write_bulk_callback = pl2303_write_bulk_callback,
.write_room = pl2303_write_room,
.chars_in_buffer = pl2303_chars_in_buffer,
.attach = pl2303_startup,
.shutdown = pl2303_shutdown,
};
enum pl2303_type {
type_0, /* don't know the difference between type 0 and */
type_1, /* type 1, until someone from prolific tells us... */
HX, /* HX version of the pl2303 chip */
};
struct pl2303_private {
spinlock_t lock;
struct pl2303_buf *buf;
int write_urb_in_use;
wait_queue_head_t delta_msr_wait;
u8 line_control;
u8 line_status;
u8 termios_initialized;
enum pl2303_type type;
};
static int pl2303_startup (struct usb_serial *serial)
{
struct pl2303_private *priv;
enum pl2303_type type = type_0;
int i;
if (serial->dev->descriptor.bDeviceClass == 0x02)
type = type_0;
else if (serial->dev->descriptor.bMaxPacketSize0 == 0x40)
type = HX;
else if (serial->dev->descriptor.bDeviceClass == 0x00)
type = type_1;
else if (serial->dev->descriptor.bDeviceClass == 0xFF)
type = type_1;
dbg("device type: %d", type);
for (i = 0; i < serial->num_ports; ++i) {
priv = kmalloc (sizeof (struct pl2303_private), GFP_KERNEL);
if (!priv)
goto cleanup;
memset (priv, 0x00, sizeof (struct pl2303_private));
spin_lock_init(&priv->lock);
priv->buf = pl2303_buf_alloc(PL2303_BUF_SIZE);
if (priv->buf == NULL) {
kfree(priv);
goto cleanup;
}
init_waitqueue_head(&priv->delta_msr_wait);
priv->type = type;
usb_set_serial_port_data(serial->port[i], priv);
}
return 0;
cleanup:
for (--i; i>=0; --i) {
priv = usb_get_serial_port_data(serial->port[i]);
pl2303_buf_free(priv->buf);
kfree(priv);
usb_set_serial_port_data(serial->port[i], NULL);
}
return -ENOMEM;
}
static int set_control_lines (struct usb_device *dev, u8 value)
{
int retval;
retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0),
SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
value, 0, NULL, 0, 100);
dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
return retval;
}
static int pl2303_write (struct usb_serial_port *port, const unsigned char *buf, int count)
{
struct pl2303_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
if (!count)
return count;
spin_lock_irqsave(&priv->lock, flags);
count = pl2303_buf_put(priv->buf, buf, count);
spin_unlock_irqrestore(&priv->lock, flags);
pl2303_send(port);
return count;
}
static void pl2303_send(struct usb_serial_port *port)
{
int count, result;
struct pl2303_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
spin_lock_irqsave(&priv->lock, flags);
if (priv->write_urb_in_use) {
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
count = pl2303_buf_get(priv->buf, port->write_urb->transfer_buffer,
port->bulk_out_size);
if (count == 0) {
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
priv->write_urb_in_use = 1;
spin_unlock_irqrestore(&priv->lock, flags);
usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, port->write_urb->transfer_buffer);
port->write_urb->transfer_buffer_length = count;
port->write_urb->dev = port->serial->dev;
result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
if (result) {
dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
priv->write_urb_in_use = 0;
// TODO: reschedule pl2303_send
}
schedule_work(&port->work);
}
static int pl2303_write_room(struct usb_serial_port *port)
{
struct pl2303_private *priv = usb_get_serial_port_data(port);
int room = 0;
unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
spin_lock_irqsave(&priv->lock, flags);
room = pl2303_buf_space_avail(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
dbg("%s - returns %d", __FUNCTION__, room);
return room;
}
static int pl2303_chars_in_buffer(struct usb_serial_port *port)
{
struct pl2303_private *priv = usb_get_serial_port_data(port);
int chars = 0;
unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
spin_lock_irqsave(&priv->lock, flags);
chars = pl2303_buf_data_avail(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
dbg("%s - returns %d", __FUNCTION__, chars);
return chars;
}
static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
{
struct usb_serial *serial = port->serial;
struct pl2303_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned int cflag;
unsigned char *buf;
int baud;
int i;
u8 control;
dbg("%s - port %d", __FUNCTION__, port->number);
if ((!port->tty) || (!port->tty->termios)) {
dbg("%s - no tty structures", __FUNCTION__);
return;
}
spin_lock_irqsave(&priv->lock, flags);
if (!priv->termios_initialized) {
*(port->tty->termios) = tty_std_termios;
port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
priv->termios_initialized = 1;
}
spin_unlock_irqrestore(&priv->lock, flags);
cflag = port->tty->termios->c_cflag;
/* check that they really want us to change something */
if (old_termios) {
if ((cflag == old_termios->c_cflag) &&
(RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
dbg("%s - nothing to change...", __FUNCTION__);
return;
}
}
buf = kmalloc (7, GFP_KERNEL);
if (!buf) {
dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
return;
}
memset (buf, 0x00, 0x07);
i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
0, 0, buf, 7, 100);
dbg ("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i,
buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
if (cflag & CSIZE) {
switch (cflag & CSIZE) {
case CS5: buf[6] = 5; break;
case CS6: buf[6] = 6; break;
case CS7: buf[6] = 7; break;
default:
case CS8: buf[6] = 8; break;
}
dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
}
baud = 0;
switch (cflag & CBAUD) {
case B0: baud = 0; break;
case B75: baud = 75; break;
case B150: baud = 150; break;
case B300: baud = 300; break;
case B600: baud = 600; break;
case B1200: baud = 1200; break;
case B1800: baud = 1800; break;
case B2400: baud = 2400; break;
case B4800: baud = 4800; break;
case B9600: baud = 9600; break;
case B19200: baud = 19200; break;
case B38400: baud = 38400; break;
case B57600: baud = 57600; break;
case B115200: baud = 115200; break;
case B230400: baud = 230400; break;
case B460800: baud = 460800; break;
default:
dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
break;
}
dbg("%s - baud = %d", __FUNCTION__, baud);
if (baud) {
buf[0] = baud & 0xff;
buf[1] = (baud >> 8) & 0xff;
buf[2] = (baud >> 16) & 0xff;
buf[3] = (baud >> 24) & 0xff;
}
/* For reference buf[4]=0 is 1 stop bits */
/* For reference buf[4]=1 is 1.5 stop bits */
/* For reference buf[4]=2 is 2 stop bits */
if (cflag & CSTOPB) {
buf[4] = 2;
dbg("%s - stop bits = 2", __FUNCTION__);
} else {
buf[4] = 0;
dbg("%s - stop bits = 1", __FUNCTION__);
}
if (cflag & PARENB) {
/* For reference buf[5]=0 is none parity */
/* For reference buf[5]=1 is odd parity */
/* For reference buf[5]=2 is even parity */
/* For reference buf[5]=3 is mark parity */
/* For reference buf[5]=4 is space parity */
if (cflag & PARODD) {
buf[5] = 1;
dbg("%s - parity = odd", __FUNCTION__);
} else {
buf[5] = 2;
dbg("%s - parity = even", __FUNCTION__);
}
} else {
buf[5] = 0;
dbg("%s - parity = none", __FUNCTION__);
}
i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
0, 0, buf, 7, 100);
dbg ("0x21:0x20:0:0 %d", i);
/* change control lines if we are switching to or from B0 */
spin_lock_irqsave(&priv->lock, flags);
control = priv->line_control;
if ((cflag & CBAUD) == B0)
priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
else
priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
if (control != priv->line_control) {
control = priv->line_control;
spin_unlock_irqrestore(&priv->lock, flags);
set_control_lines(serial->dev, control);
} else {
spin_unlock_irqrestore(&priv->lock, flags);
}
buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
0, 0, buf, 7, 100);
dbg ("0xa1:0x21:0:0 %d - %x %x %x %x %x %x %x", i,
buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
if (cflag & CRTSCTS) {
__u16 index;
if (priv->type == HX)
index = 0x61;
else
index = 0x41;
i = usb_control_msg(serial->dev,
usb_sndctrlpipe(serial->dev, 0),
VENDOR_WRITE_REQUEST,
VENDOR_WRITE_REQUEST_TYPE,
0x0, index, NULL, 0, 100);
dbg ("0x40:0x1:0x0:0x%x %d", index, i);
}
kfree (buf);
}
static int pl2303_open (struct usb_serial_port *port, struct file *filp)
{
struct termios tmp_termios;
struct usb_serial *serial = port->serial;
struct pl2303_private *priv = usb_get_serial_port_data(port);
unsigned char *buf;
int result;
dbg("%s - port %d", __FUNCTION__, port->number);
usb_clear_halt(serial->dev, port->write_urb->pipe);
usb_clear_halt(serial->dev, port->read_urb->pipe);
buf = kmalloc(10, GFP_KERNEL);
if (buf==NULL)
return -ENOMEM;
#define FISH(a,b,c,d) \
result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0), \
b, a, c, d, buf, 1, 100); \
dbg("0x%x:0x%x:0x%x:0x%x %d - %x",a,b,c,d,result,buf[0]);
#define SOUP(a,b,c,d) \
result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0), \
b, a, c, d, NULL, 0, 100); \
dbg("0x%x:0x%x:0x%x:0x%x %d",a,b,c,d,result);
FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0);
if (priv->type == HX) {
/* HX chip */
SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x44);
/* reset upstream data pipes */
SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 8, 0);
SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 9, 0);
} else {
SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 0x24);
}
kfree(buf);
/* Setup termios */
if (port->tty) {
pl2303_set_termios (port, &tmp_termios);
}
//FIXME: need to assert RTS and DTR if CRTSCTS off
dbg("%s - submitting read urb", __FUNCTION__);
port->read_urb->dev = serial->dev;
result = usb_submit_urb (port->read_urb, GFP_KERNEL);
if (result) {
dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
pl2303_close (port, NULL);
return -EPROTO;
}
dbg("%s - submitting interrupt urb", __FUNCTION__);
port->interrupt_in_urb->dev = serial->dev;
result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
if (result) {
dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
pl2303_close (port, NULL);
return -EPROTO;
}
return 0;
}
static void pl2303_close (struct usb_serial_port *port, struct file *filp)
{
struct pl2303_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned int c_cflag;
int bps;
long timeout;
wait_queue_t wait; \
dbg("%s - port %d", __FUNCTION__, port->number);
/* wait for data to drain from the buffer */
spin_lock_irqsave(&priv->lock, flags);
timeout = PL2303_CLOSING_WAIT;
init_waitqueue_entry(&wait, current);
add_wait_queue(&port->tty->write_wait, &wait);
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
if (pl2303_buf_data_avail(priv->buf) == 0
|| timeout == 0 || signal_pending(current)
|| !usb_get_intfdata(port->serial->interface)) /* disconnect */
break;
spin_unlock_irqrestore(&priv->lock, flags);
timeout = schedule_timeout(timeout);
spin_lock_irqsave(&priv->lock, flags);
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&port->tty->write_wait, &wait);
/* clear out any remaining data in the buffer */
pl2303_buf_clear(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
/* wait for characters to drain from the device */
/* (this is long enough for the entire 256 byte */
/* pl2303 hardware buffer to drain with no flow */
/* control for data rates of 1200 bps or more, */
/* for lower rates we should really know how much */
/* data is in the buffer to compute a delay */
/* that is not unnecessarily long) */
bps = tty_get_baud_rate(port->tty);
if (bps > 1200)
timeout = max((HZ*2560)/bps,HZ/10);
else
timeout = 2*HZ;
set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout(timeout);
/* shutdown our urbs */
dbg("%s - shutting down urbs", __FUNCTION__);
usb_kill_urb(port->write_urb);
usb_kill_urb(port->read_urb);
usb_kill_urb(port->interrupt_in_urb);
if (port->tty) {
c_cflag = port->tty->termios->c_cflag;
if (c_cflag & HUPCL) {
/* drop DTR and RTS */
spin_lock_irqsave(&priv->lock, flags);
priv->line_control = 0;
spin_unlock_irqrestore (&priv->lock, flags);
set_control_lines (port->serial->dev, 0);
}
}
}
static int pl2303_tiocmset (struct usb_serial_port *port, struct file *file,
unsigned int set, unsigned int clear)
{
struct pl2303_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
u8 control;
if (!usb_get_intfdata(port->serial->interface))
return -ENODEV;
spin_lock_irqsave (&priv->lock, flags);
if (set & TIOCM_RTS)
priv->line_control |= CONTROL_RTS;
if (set & TIOCM_DTR)
priv->line_control |= CONTROL_DTR;
if (clear & TIOCM_RTS)
priv->line_control &= ~CONTROL_RTS;
if (clear & TIOCM_DTR)
priv->line_control &= ~CONTROL_DTR;
control = priv->line_control;
spin_unlock_irqrestore (&priv->lock, flags);
return set_control_lines (port->serial->dev, control);
}
static int pl2303_tiocmget (struct usb_serial_port *port, struct file *file)
{
struct pl2303_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned int mcr;
unsigned int status;
unsigned int result;
dbg("%s (%d)", __FUNCTION__, port->number);
if (!usb_get_intfdata(port->serial->interface))
return -ENODEV;
spin_lock_irqsave (&priv->lock, flags);
mcr = priv->line_control;
status = priv->line_status;
spin_unlock_irqrestore (&priv->lock, flags);
result = ((mcr & CONTROL_DTR) ? TIOCM_DTR : 0)
| ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0)
| ((status & UART_CTS) ? TIOCM_CTS : 0)
| ((status & UART_DSR) ? TIOCM_DSR : 0)
| ((status & UART_RING) ? TIOCM_RI : 0)
| ((status & UART_DCD) ? TIOCM_CD : 0);
dbg("%s - result = %x", __FUNCTION__, result);
return result;
}
static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
{
struct pl2303_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
unsigned int prevstatus;
unsigned int status;
unsigned int changed;
spin_lock_irqsave (&priv->lock, flags);
prevstatus = priv->line_status;
spin_unlock_irqrestore (&priv->lock, flags);
while (1) {
interruptible_sleep_on(&priv->delta_msr_wait);
/* see if a signal did it */
if (signal_pending(current))
return -ERESTARTSYS;
spin_lock_irqsave (&priv->lock, flags);
status = priv->line_status;
spin_unlock_irqrestore (&priv->lock, flags);
changed=prevstatus^status;
if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
((arg & TIOCM_CD) && (changed & UART_DCD)) ||
((arg & TIOCM_CTS) && (changed & UART_CTS)) ) {
return 0;
}
prevstatus = status;
}
/* NOTREACHED */
return 0;
}
static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
{
dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
switch (cmd) {
case TIOCMIWAIT:
dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
return wait_modem_info(port, arg);
default:
dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
break;
}
return -ENOIOCTLCMD;
}
static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
{
struct usb_serial *serial = port->serial;
u16 state;
int result;
dbg("%s - port %d", __FUNCTION__, port->number);
if (break_state == 0)
state = BREAK_OFF;
else
state = BREAK_ON;
dbg("%s - turning break %s", __FUNCTION__, state==BREAK_OFF ? "off" : "on");
result = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
0, NULL, 0, 100);
if (result)
dbg("%s - error sending break = %d", __FUNCTION__, result);
}
static void pl2303_shutdown (struct usb_serial *serial)
{
int i;
struct pl2303_private *priv;
dbg("%s", __FUNCTION__);
for (i = 0; i < serial->num_ports; ++i) {
priv = usb_get_serial_port_data(serial->port[i]);
if (priv) {
pl2303_buf_free(priv->buf);
kfree(priv);
usb_set_serial_port_data(serial->port[i], NULL);
}
}
}
static void pl2303_update_line_status(struct usb_serial_port *port,
unsigned char *data,
unsigned int actual_length)
{
struct pl2303_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
u8 status_idx = UART_STATE;
u8 length = UART_STATE;
if ((le16_to_cpu(port->serial->dev->descriptor.idVendor) == SIEMENS_VENDOR_ID) &&
(le16_to_cpu(port->serial->dev->descriptor.idProduct) == SIEMENS_PRODUCT_ID_X65)) {
length = 1;
status_idx = 0;
}
if (actual_length < length)
goto exit;
/* Save off the uart status for others to look at */
spin_lock_irqsave(&priv->lock, flags);
priv->line_status = data[status_idx];
spin_unlock_irqrestore(&priv->lock, flags);
exit:
return;
}
static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
{
struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
unsigned char *data = urb->transfer_buffer;
unsigned int actual_length = urb->actual_length;
int status;
dbg("%s (%d)", __FUNCTION__, port->number);
switch (urb->status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
return;
default:
dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
goto exit;
}
usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
pl2303_update_line_status(port, data, actual_length);
exit:
status = usb_submit_urb (urb, GFP_ATOMIC);
if (status)
dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
__FUNCTION__, status);
}
static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
{
struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
struct pl2303_private *priv = usb_get_serial_port_data(port);
struct tty_struct *tty;
unsigned char *data = urb->transfer_buffer;
unsigned long flags;
int i;
int result;
u8 status;
char tty_flag;
dbg("%s - port %d", __FUNCTION__, port->number);
if (urb->status) {
dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
if (!port->open_count) {
dbg("%s - port is closed, exiting.", __FUNCTION__);
return;
}
if (urb->status == -EPROTO) {
/* PL2303 mysteriously fails with -EPROTO reschedule the read */
dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
urb->status = 0;
urb->dev = port->serial->dev;
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result)
dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
return;
}
dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
return;
}
usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
/* get tty_flag from status */
tty_flag = TTY_NORMAL;
spin_lock_irqsave(&priv->lock, flags);
status = priv->line_status;
priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
spin_unlock_irqrestore(&priv->lock, flags);
wake_up_interruptible (&priv->delta_msr_wait);
/* break takes precedence over parity, */
/* which takes precedence over framing errors */
if (status & UART_BREAK_ERROR )
tty_flag = TTY_BREAK;
else if (status & UART_PARITY_ERROR)
tty_flag = TTY_PARITY;
else if (status & UART_FRAME_ERROR)
tty_flag = TTY_FRAME;
dbg("%s - tty_flag = %d", __FUNCTION__, tty_flag);
tty = port->tty;
if (tty && urb->actual_length) {
/* overrun is special, not associated with a char */
if (status & UART_OVERRUN_ERROR)
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
for (i = 0; i < urb->actual_length; ++i) {
if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
tty_flip_buffer_push(tty);
}
tty_insert_flip_char (tty, data[i], tty_flag);
}
tty_flip_buffer_push (tty);
}
/* Schedule the next read _if_ we are still open */
if (port->open_count) {
urb->dev = port->serial->dev;
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result)
dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
}
return;
}
static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
{
struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
struct pl2303_private *priv = usb_get_serial_port_data(port);
int result;
dbg("%s - port %d", __FUNCTION__, port->number);
switch (urb->status) {
case 0:
/* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* this urb is terminated, clean up */
dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
priv->write_urb_in_use = 0;
return;
default:
/* error in the urb, so we have to resubmit it */
dbg("%s - Overflow in write", __FUNCTION__);
dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
port->write_urb->transfer_buffer_length = 1;
port->write_urb->dev = port->serial->dev;
result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
if (result)
dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result);
else
return;
}
priv->write_urb_in_use = 0;
/* send any buffered data */
pl2303_send(port);
}
/*
* pl2303_buf_alloc
*
* Allocate a circular buffer and all associated memory.
*/
static struct pl2303_buf *pl2303_buf_alloc(unsigned int size)
{
struct pl2303_buf *pb;
if (size == 0)
return NULL;
pb = (struct pl2303_buf *)kmalloc(sizeof(struct pl2303_buf), GFP_KERNEL);
if (pb == NULL)
return NULL;
pb->buf_buf = kmalloc(size, GFP_KERNEL);
if (pb->buf_buf == NULL) {
kfree(pb);
return NULL;
}
pb->buf_size = size;
pb->buf_get = pb->buf_put = pb->buf_buf;
return pb;
}
/*
* pl2303_buf_free
*
* Free the buffer and all associated memory.
*/
static void pl2303_buf_free(struct pl2303_buf *pb)
{
if (pb) {
kfree(pb->buf_buf);
kfree(pb);
}
}
/*
* pl2303_buf_clear
*
* Clear out all data in the circular buffer.
*/
static void pl2303_buf_clear(struct pl2303_buf *pb)
{
if (pb != NULL)
pb->buf_get = pb->buf_put;
/* equivalent to a get of all data available */
}
/*
* pl2303_buf_data_avail
*
* Return the number of bytes of data available in the circular
* buffer.
*/
static unsigned int pl2303_buf_data_avail(struct pl2303_buf *pb)
{
if (pb != NULL)
return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
else
return 0;
}
/*
* pl2303_buf_space_avail
*
* Return the number of bytes of space available in the circular
* buffer.
*/
static unsigned int pl2303_buf_space_avail(struct pl2303_buf *pb)
{
if (pb != NULL)
return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
else
return 0;
}
/*
* pl2303_buf_put
*
* Copy data data from a user buffer and put it into the circular buffer.
* Restrict to the amount of space available.
*
* Return the number of bytes copied.
*/
static unsigned int pl2303_buf_put(struct pl2303_buf *pb, const char *buf,
unsigned int count)
{
unsigned int len;
if (pb == NULL)
return 0;
len = pl2303_buf_space_avail(pb);
if (count > len)
count = len;
if (count == 0)
return 0;
len = pb->buf_buf + pb->buf_size - pb->buf_put;
if (count > len) {
memcpy(pb->buf_put, buf, len);
memcpy(pb->buf_buf, buf+len, count - len);
pb->buf_put = pb->buf_buf + count - len;
} else {
memcpy(pb->buf_put, buf, count);
if (count < len)
pb->buf_put += count;
else /* count == len */
pb->buf_put = pb->buf_buf;
}
return count;
}
/*
* pl2303_buf_get
*
* Get data from the circular buffer and copy to the given buffer.
* Restrict to the amount of data available.
*
* Return the number of bytes copied.
*/
static unsigned int pl2303_buf_get(struct pl2303_buf *pb, char *buf,
unsigned int count)
{
unsigned int len;
if (pb == NULL)
return 0;
len = pl2303_buf_data_avail(pb);
if (count > len)
count = len;
if (count == 0)
return 0;
len = pb->buf_buf + pb->buf_size - pb->buf_get;
if (count > len) {
memcpy(buf, pb->buf_get, len);
memcpy(buf+len, pb->buf_buf, count - len);
pb->buf_get = pb->buf_buf + count - len;
} else {
memcpy(buf, pb->buf_get, count);
if (count < len)
pb->buf_get += count;
else /* count == len */
pb->buf_get = pb->buf_buf;
}
return count;
}
static int __init pl2303_init (void)
{
int retval;
retval = usb_serial_register(&pl2303_device);
if (retval)
goto failed_usb_serial_register;
retval = usb_register(&pl2303_driver);
if (retval)
goto failed_usb_register;
info(DRIVER_DESC " " DRIVER_VERSION);
return 0;
failed_usb_register:
usb_serial_deregister(&pl2303_device);
failed_usb_serial_register:
return retval;
}
static void __exit pl2303_exit (void)
{
usb_deregister (&pl2303_driver);
usb_serial_deregister (&pl2303_device);
}
module_init(pl2303_init);
module_exit(pl2303_exit);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debug enabled or not");
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