unsigned int cctdev_poll(struct file *filp, poll_table *wait)
{
struct cctdev_dev *dev = filp->private_data;
int minor_num;
unsigned int mask = 0;
F_ENTER();
minor_num = MINOR(dev->cdev.dev);
down(&txCittyBuf[minor_num].gSem);
poll_wait(filp, &txCittyBuf[minor_num].gInq, wait);
if (txCittyBuf[minor_num].iBufOut != txCittyBuf[minor_num].iBufIn)
mask |= POLLIN | POLLRDNORM;
mask |= POLLOUT | POLLWRNORM;
up(&txCittyBuf[minor_num].gSem);
F_LEAVE();
return mask;
}
/* the real citty_ioctl function.
* The above is done to get the small functions*/
static int citty_ioctl(struct tty_struct *tty,
unsigned int cmd, unsigned long arg)
{
struct file *file = NULL;
F_ENTER();
switch (cmd) {
case TIOCGSERIAL:
return citty_ioctl_tiocgserial(tty, file, cmd, arg);
case TIOCMIWAIT:
return citty_ioctl_tiocmiwait(tty, file, cmd, arg);
case TIOCGICOUNT:
return citty_ioctl_tiocgicount(tty, file, cmd, arg);
case TCSETS:
return citty_ioctl_tcsets(tty, file, cmd, arg);
case TCGETS: /* 0x5401 ioctls.h */
return citty_ioctl_tcgets(tty, file, cmd, arg);
case TCSETSF: /* 0x5404 */
case TCSETAF: /* 0x5408 */
return 0; /* has to return zero for qtopia to work */
default:
PDEBUG("citty_ioctl cmd: %d.\n", cmd);
return -ENOIOCTLCMD; /* for PPPD to work? */
break;
}
F_LEAVE();
}
static int citty_ioctl_tiocgicount(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct citty_port *citty = tty->driver_data;
F_ENTER();
if (cmd == TIOCGICOUNT) {
struct async_icount cnow = citty->icount;
struct serial_icounter_struct icount;
icount.cts = cnow.cts;
icount.dsr = cnow.dsr;
icount.rng = cnow.rng;
icount.dcd = cnow.dcd;
icount.rx = cnow.rx;
icount.tx = cnow.tx;
icount.frame = cnow.frame;
icount.overrun = cnow.overrun;
icount.parity = cnow.parity;
icount.brk = cnow.brk;
icount.buf_overrun = cnow.buf_overrun;
if (copy_to_user((void __user *)arg, &icount, sizeof(icount)))
return -EFAULT;
return 0;
}
F_LEAVE();
return -ENOIOCTLCMD;
}
static void __exit citty_exit(void)
{
struct citty_port *citty = NULL;
int i;
F_ENTER();
/* unregister devices */
for (i = 0; i < CITTY_TTY_MINORS; ++i) {
down(&sem_lock_tty[i]);
citty = citty_table[i];
if (citty) {
citty_table[i] = NULL;
kfree(citty);
}
up(&sem_lock_tty[i]);
tty_port_destroy(&citty_port_table[i]);
tty_unregister_device(citty_tty_driver, i);
cci_free_buffer(&txCittyBuf[i]);
}
/* unregister driver */
tty_unregister_driver(citty_tty_driver);
put_tty_driver(citty_tty_driver);
/* clean up for the cctdev stuff */
cctdev_cleanup_module();
F_LEAVE();
}
int cctdev_open(struct inode *inode, struct file *filp)
{
struct cctdev_dev *dev; /* device information */
F_ENTER();
dev = container_of(inode->i_cdev, struct cctdev_dev, cdev);
filp->private_data = dev; /* for other methods */
/* now trim to 0 the length of the device if open was write-only */
/*
if ( (filp->f_flags & O_ACCMODE) == O_WRONLY) {
if (down_interruptible(&dev->sem))
return -ERESTARTSYS;
up(&dev->sem);
}
*/
/* used to keep track of how many readers */
down(&dev->sem);
if (filp->f_mode & FMODE_READ)
dev->nreaders++;
if (filp->f_mode & FMODE_WRITE)
dev->nwriters++;
up(&dev->sem);
F_LEAVE();
return nonseekable_open(inode, filp); /* success */
}
static int citty_write_room(struct tty_struct *tty)
{
struct citty_port *citty = NULL;
int index = tty->index;
int room = -EINVAL;
F_ENTER();
down(&sem_lock_tty[index]);
citty = citty_table[index];
if (!citty) {
up(&sem_lock_tty[index]);
return -ENODEV;
}
if (!citty->port->count) {
PDEBUG("citty_write_room: no port is open.");
/* port was not opened */
goto exit;
}
/* calculate how much room is left in the device */
/* CHECKPOINT */
/* room = CITTY_BUF_SIZE * spacefree( &txCittyBuf ); */
room = CITTY_BUF_SIZE * spacefree(&txCittyBuf[tty->index]);
exit:
up(&sem_lock_tty[index]);
F_LEAVE();
return room;
}
void cci_init_buffer(struct buf_struct *buffer)
{
int i;
F_ENTER();
for (i = 0; i < NUM_CITTY_BUF; i++) {
buffer->pBuf[i] = kmalloc(CITTY_BUF_SIZE, GFP_KERNEL);
if (!buffer->pBuf[i])
printk(KERN_ERR "Failed to allocate memory.\n");
buffer->iBufIn = 0;
buffer->iBufOut = 0;
}
sema_init(&(buffer->gSem), 1);
/* init the queue */
init_waitqueue_head(&(buffer->gInq));
init_waitqueue_head(&(buffer->gOutq));
F_LEAVE();
}
static void __exit cidatatty_exit(void)
{
struct cidatatty_port *cidatatty;
int i;
F_ENTER();
/* unregister device */
for (i = 0; i < CIDATATTY_TTY_MINORS; ++i) {
cidatatty = cidatatty_table[i].data_port;
if (cidatatty) {
/* close the port */
while (cidatatty->port.count)
do_close(cidatatty);
cidatatty_table[i].data_port = NULL;
tty_port_destroy(&cidatatty->port);
kfree(cidatatty);
}
tty_unregister_device(cidatatty_tty_driver, i);
}
/* unregister driver */
tty_unregister_driver(cidatatty_tty_driver);
cctdatadev_cleanup_module();
F_LEAVE();
}
static void citty_close(struct tty_struct *tty, struct file *file)
{
struct citty_port *citty = NULL;
int index = tty->index;
F_ENTER();
down(&sem_lock_tty[index]);
citty = citty_table[index];
/* Modified by Rovin Yu: release citty and related resource */
if (citty) {
if (!citty->port->count) {
/* port was never opened */
goto exit;
}
--citty->port->count;
PDEBUG("citty_close: index is %d, count is %d\n",
index, citty->port->count);
if (citty->port->count <= 0) {
citty_table[index] = NULL;
kfree(citty);
}
}
exit:
up(&sem_lock_tty[index]);
F_LEAVE();
}
static void __exit citty_exit(void)
{
struct citty_serial *citty;
int i;
F_ENTER();
for (i = 0; i < CITTY_TTY_MINORS; ++i)
tty_unregister_device(citty_tty_driver, i);
tty_unregister_driver(citty_tty_driver);
put_tty_driver(citty_tty_driver);
/* free the memory */
for (i = 0; i < CITTY_TTY_MINORS; ++i)
{
down(&sem[i]);
citty = citty_table[i];
if (citty)
{
kfree(citty);
citty_table[i] = NULL;
//cci_free_buffer(&txCittyBuf[i]);
}
up(&sem[i]);
cci_free_buffer(&txCittyBuf[i]); //Modified by Rovin to move here
}
/* clean up for the cctdev stuff */
cctdev_cleanup_module();
F_LEAVE();
}
static int citty_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
#endif
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39)
struct file *file = NULL;
#endif
F_ENTER();
switch (cmd)
{
case TIOCGSERIAL:
return citty_ioctl_tiocgserial(tty, file, cmd, arg);
case TIOCMIWAIT:
return citty_ioctl_tiocmiwait(tty, file, cmd, arg);
case TIOCGICOUNT:
return citty_ioctl_tiocgicount(tty, file, cmd, arg);
case TCSETS:
return citty_ioctl_tcsets(tty, file, cmd, arg);
case TCGETS: //0x5401 ioctls.h
return citty_ioctl_tcgets(tty, file, cmd, arg);
case TCSETSF: //0x5404
case TCSETAF: //0x5408
return 0; //has to return zero for qtopia to work
default:
PDEBUG("citty_ioctl cmd: %d.\n", cmd);
return -ENOIOCTLCMD; // for PPPD to work?
break;
}
F_LEAVE();
}
static int __init citty_init(void)
{
int retval;
int i;
F_ENTER();
/* allocate the tty driver */
citty_tty_driver = alloc_tty_driver(CITTY_TTY_MINORS);
if (!citty_tty_driver)
return -ENOMEM;
/* initialize the tty driver */
citty_tty_driver->owner = THIS_MODULE;
citty_tty_driver->driver_name = "citty_tty";
citty_tty_driver->name = "citty";
citty_tty_driver->major = CITTY_TTY_MAJOR;
citty_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
citty_tty_driver->subtype = SERIAL_TYPE_NORMAL;
citty_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
citty_tty_driver->init_termios = tty_std_termios;
/* B115200 | CS8 | CREAD | HUPCL | CLOCAL; */
citty_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL;
citty_tty_driver->init_termios.c_iflag = IGNBRK | IGNCR | IGNPAR;
citty_tty_driver->init_termios.c_oflag = 0;
citty_tty_driver->init_termios.c_lflag = 0;
tty_set_operations(citty_tty_driver, &serial_ops);
/* register the tty driver */
retval = tty_register_driver(citty_tty_driver);
if (retval) {
printk(KERN_ERR "failed to register citty tty driver");
put_tty_driver(citty_tty_driver);
citty_tty_driver = NULL;
return retval;
}
/* register tty devices */
for (i = 0; i < CITTY_TTY_MINORS; ++i) {
/* Init buffer */
cci_init_buffer(&txCittyBuf[i]);
sema_init(&sem_lock_tty[i], 1);
tty_port_init(&citty_port_table[i]);
tty_port_register_device(&citty_port_table[i],
citty_tty_driver, i, NULL);
}
printk(KERN_INFO DRIVER_DESC " " DRIVER_VERSION "\n");
cctdev_init_module();
F_LEAVE();
return retval;
}
static void cidatatty_close(struct tty_struct *tty, struct file *file)
{
struct cidatatty_port *cidatatty = tty->driver_data;
F_ENTER();
if (cidatatty)
do_close(cidatatty);
F_LEAVE();
}
static int citty_open(struct tty_struct *tty, struct file *file)
{
struct citty_serial *citty;
int index;
F_ENTER();
schedule();
/* initialize the pointer in case something fails */
tty->driver_data = NULL;
/* get the serial object associated with this tty pointer */
index = tty->index;
if (!cctdev_ready || (cctdev_devices[index].nreaders == 0 && cctdev_devices[index].nwriters == 0))
return -EAGAIN;
down(&sem[index]);
citty = citty_table[index];
if (citty == NULL)
{
/* first time accessing this device, let's create it */
citty = kmalloc(sizeof(*citty), GFP_KERNEL);
if (!citty)
{
up(&sem[index]);
return -ENOMEM;
}
citty->open_count = 0;
citty_table[index] = citty;
}
/* save our structure within the tty structure */
tty->driver_data = citty;
/* vcy */
tty->flags = TTY_NO_WRITE_SPLIT | tty->flags;
citty->tty = tty;
++citty->open_count;
if (citty->open_count == 1)
{
/* this is the first time this port is opened */
/* do any hardware initialization needed here */
}
up(&sem[index]);
F_LEAVE();
return 0;
}
static int citty_open(struct tty_struct *tty, struct file *file)
{
struct citty_port *citty = NULL;
int index = tty->index;
F_ENTER();
schedule();
/* initialize the pointer in case something fails */
tty->driver_data = NULL;
/* get the serial object associated with this tty pointer */
if (!cctdev_ready
|| (cctdev_devices[index].nreaders == 0
&& cctdev_devices[index].nwriters == 0))
return -EAGAIN;
mutex_lock(&mutex_lock_tty[index]);
citty = citty_table[index];
if (!citty) {
citty = kmalloc(sizeof(*citty), GFP_KERNEL);
if (!citty) {
mutex_unlock(&mutex_lock_tty[index]);
return -ENOMEM;
}
/* save tty_port structure within the our structure */
citty_table[index] = citty;
citty->port = &citty_port_table[index];
citty->port->count = 0;
}
/* do the real open operation */
/* save our structure within the tty structure */
tty->driver_data = citty;
/* vcy */
tty->flags = TTY_NO_WRITE_SPLIT | tty->flags;
/* save tty_struct within the tty_port structure */
citty->port->tty = tty;
++citty->port->count;
if (citty->port->count == 1) {
/* this is the first time this port is opened */
/* do any hardware initialization needed here */
}
mutex_unlock(&mutex_lock_tty[index]);
F_LEAVE();
return 0;
}
static int citty_write(struct tty_struct *tty, const unsigned char *buffer,
int count)
{
struct citty_port *citty = NULL;
int index = tty->index;
int retval = -EINVAL;
F_ENTER();
/* for some reason, this function is called with count == 0 */
if (count <= 0) {
printk(KERN_ERR "Error: count is %d.\n", count);
return 0;
}
down(&sem_lock_tty[index]);
citty = citty_table[index];
if (!citty) {
up(&sem_lock_tty[index]);
PDEBUG("Warning: citty_write: citty is NULL\n");
return -ENODEV;
}
if (!citty->port->count) {
printk(KERN_ERR "Error: citty_write: port was not open\n");
/* port was not opened */
goto exit;
}
#ifdef DEBUG_BUF_CONTENT
/* int i; */
printk(KERN_DEBUG "CITTY Tx Buffer datalen is %d\n data:", count);
for (i = 0; i < count; i++)
printk(KERN_DEBUG "%02x(%c)", buffer[i]&0xff, buffer[i]&0xff);
/* printk(KERN_DEBUG " %02x", buffer[i]&0xff ); */
printk(KERN_DEBUG "\n");
#endif
/*
* packet is ready for transmission:
* write the packet to TxCitty buffer
*/
retval =
write_citty_buffer(&txCittyBuf[tty->index], buffer, count,
COPY_FROM_CITTY);
exit:
up(&sem_lock_tty[index]);
F_LEAVE();
return retval;
}
static int citty_ioctl_tcgets(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
F_ENTER();
if (copy_to_user((void *)arg, tty->termios, sizeof(struct termios)))
{
printk("Failed to copy to user for tcgets.\n");
return -EFAULT;
}
F_LEAVE();
return 0;
}
/*
* Set up the char_dev structure for this device.
*/
static void cctdev_setup_cdev(struct cctdev_dev *dev, int index)
{
int err, devno = MKDEV(cctdev_major, cctdev_minor + index);
F_ENTER();
cdev_init(&dev->cdev, &cctdev_fops);
dev->cdev.owner = THIS_MODULE;
dev->cdev.ops = &cctdev_fops;
err = cdev_add(&dev->cdev, devno, 1);
/* Fail gracefully if need be */
if (err)
printk(KERN_NOTICE "Error %d adding cctdev%d", err, index);
F_LEAVE();
}
static int citty_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
#endif
{
struct citty_serial *citty = tty->driver_data;
unsigned int mcr = citty->mcr;
F_ENTER();
if (set & TIOCM_RTS)
mcr |= MCR_RTS;
if (set & TIOCM_DTR)
mcr |= MCR_RTS;
if (set & TIOCM_LOOP)
mcr |= MCR_RTS;
if (set & TIOCM_CTS)
mcr |= MCR_RTS;
if (set & TIOCM_RI)
mcr |= MCR_RTS;
if (set & TIOCM_DSR)
mcr |= MCR_RTS;
if (set & TIOCM_CAR)
mcr |= MCR_RTS;
if (clear & TIOCM_RTS)
mcr &= ~MCR_RTS;
if (clear & TIOCM_DTR)
mcr &= ~MCR_RTS;
if (clear & TIOCM_LOOP)
mcr &= ~MCR_RTS;
if (clear & TIOCM_CTS)
mcr &= ~MCR_RTS;
if (clear & TIOCM_CAR)
mcr &= ~MCR_RTS;
if (clear & TIOCM_RI)
mcr &= ~MCR_RTS;
if (clear & TIOCM_DSR)
mcr &= ~MCR_RTS;
/* set the new MCR value in the device */
citty->mcr = mcr;
F_LEAVE();
return 0;
}
static int citty_ioctl_tiocmiwait(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct citty_serial *citty = tty->driver_data;
F_ENTER();
if (cmd == TIOCMIWAIT)
{
DECLARE_WAITQUEUE(wait, current);
struct async_icount cnow;
struct async_icount cprev;
cprev = citty->icount;
while (1)
{
add_wait_queue(&citty->wait, &wait);
set_current_state(TASK_INTERRUPTIBLE);
schedule();
remove_wait_queue(&citty->wait, &wait);
/* see if a signal woke us up */
if (signal_pending(current))
return -ERESTARTSYS;
cnow = citty->icount;
if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
return -EIO; /* no change => error */
if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) )
{
return 0;
}
cprev = cnow;
}
}
F_LEAVE();
return -ENOIOCTLCMD;
}
int cctdatadev_open(struct inode *inode, struct file *filp)
{
struct cctdatadev_dev *dev;
F_ENTER();
#if 1
dev = container_of(inode->i_cdev, struct cctdatadev_dev, cdev);
filp->private_data = dev; /* for other methods */
/* used to keep track of how many readers */
if (filp->f_mode & FMODE_READ)
dev->nreaders++;
if (filp->f_mode & FMODE_WRITE)
dev->nwriters++;
#endif
F_LEAVE();
return nonseekable_open(inode, filp); /* success */
}
/*******************************************************************
* FUNCTION: cctdev_read
*
* DESCRIPTION: To pass the data from TxBuffer to CI
*
* RETURNS: utlFAILED or utlSUCCESS
*
*******************************************************************/
ssize_t cctdev_read(struct file *filp, char __user *buf, size_t count,
loff_t *f_pos)
{
struct cctdev_dev *dev = filp->private_data;
ssize_t retval = 0;
int minor_num;
F_ENTER();
/* Extract Minor Number*/
minor_num = MINOR(dev->cdev.dev);
PDEBUG("txCittyBuf[%d].iBufOut: %d, iBufIn: %d\n", minor_num, txCittyBuf[minor_num].iBufOut, txCittyBuf[minor_num].iBufIn);
retval = read_citty_buffer( buf, &txCittyBuf[minor_num], COPY_TO_USER);
F_LEAVE();
return retval;
}
static int citty_tiocmget(struct tty_struct *tty)
{
struct citty_port *citty = tty->driver_data;
unsigned int result = 0;
unsigned int msr = citty->msr;
unsigned int mcr = citty->mcr;
F_ENTER();
result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) | /* DTR is set */
((mcr & MCR_RTS) ? TIOCM_RTS : 0) | /* RTS is set */
((mcr & MCR_LOOP) ? TIOCM_LOOP : 0) | /* LOOP is set */
((msr & MSR_CTS) ? TIOCM_CTS : 0) | /* CTS is set */
((msr & MSR_CD) ? TIOCM_CAR : 0) | /* CD is set */
((msr & MSR_RI) ? TIOCM_RI : 0) | /* RI is set */
((msr & MSR_DSR) ? TIOCM_DSR : 0); /* DSR is set */
F_LEAVE();
return result;
}
static int citty_tiocmget(struct tty_struct *tty, struct file *file)
#endif
{
struct citty_serial *citty = tty->driver_data;
unsigned int result = 0;
unsigned int msr = citty->msr;
unsigned int mcr = citty->mcr;
F_ENTER();
result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0) | /* DTR is set */
((mcr & MCR_RTS) ? TIOCM_RTS : 0) | /* RTS is set */
((mcr & MCR_LOOP) ? TIOCM_LOOP : 0) | /* LOOP is set */
((msr & MSR_CTS) ? TIOCM_CTS : 0) | /* CTS is set */
((msr & MSR_CD) ? TIOCM_CAR : 0) | /* Carrier detect is set*/
((msr & MSR_RI) ? TIOCM_RI : 0) | /* Ring Indicator is set */
((msr & MSR_DSR) ? TIOCM_DSR : 0); /* DSR is set */
F_LEAVE();
return result;
}
int cctdev_open(struct inode *inode, struct file *filp)
{
struct cctdev_dev *dev; /* device information */
F_ENTER();
dev = container_of(inode->i_cdev, struct cctdev_dev, cdev);
filp->private_data = dev; /* for other methods */
/* used to keep track of how many readers */
mutex_lock(&dev->lock);
if (filp->f_mode & FMODE_READ)
dev->nreaders++;
if (filp->f_mode & FMODE_WRITE)
dev->nwriters++;
mutex_unlock(&dev->lock);
F_LEAVE();
return nonseekable_open(inode, filp); /* success */
}
static int cidatatty_ioctl_tiocgserial(struct tty_struct *tty,
struct file *file, unsigned int cmd,
unsigned long arg)
{
struct cidatatty_port *cidatatty = tty->driver_data;
F_ENTER();
if (cmd == TIOCGSERIAL) {
struct serial_struct tmp;
if (!arg)
return -EFAULT;
memset(&tmp, 0, sizeof(tmp));
tmp.type = cidatatty->serial.type;
tmp.line = cidatatty->serial.line;
tmp.port = cidatatty->serial.port;
tmp.irq = cidatatty->serial.irq;
tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
tmp.xmit_fifo_size = cidatatty->serial.xmit_fifo_size;
tmp.baud_base = cidatatty->serial.baud_base;
tmp.close_delay = 5 * HZ;
tmp.closing_wait = 30 * HZ;
tmp.custom_divisor = cidatatty->serial.custom_divisor;
tmp.hub6 = cidatatty->serial.hub6;
tmp.io_type = cidatatty->serial.io_type;
if (copy_to_user
((void __user *)arg, &tmp, sizeof(struct serial_struct)))
return -EFAULT;
return 0;
}
F_LEAVE();
return -ENOIOCTLCMD;
}
static int citty_ioctl_tcsets(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
F_ENTER();
memcpy((void *)&tty->termios, (void *)arg, sizeof(struct ktermios));
/*
struct termios * new_termios = (struct termios *) arg;
tty->termios->c_iflag = new_termios->c_iflag;
tty->termios->c_oflag = new_termios->c_oflag;
tty->termios->c_cflag = new_termios->c_cflag;
tty->termios->c_lflag = new_termios->c_lflag;
tty->termios->c_line = new_termios->c_line;
int i;
for(i = 0; i <NCCS; i++)
tty->termios->c_cc[i] = new_termios->c_cc[i];
*/
F_LEAVE();
return 0;
}
static int citty_read_proc(char *page, char **start, off_t off, int count,
int *eof, void *data)
{
struct citty_serial *citty;
off_t begin = 0;
int length = 0;
int i;
F_ENTER();
length += sprintf(page, "cittyserinfo:1.0 driver:%s\n", DRIVER_VERSION);
for (i = 0; i < CITTY_TTY_MINORS && length < PAGE_SIZE; ++i)
{
citty = citty_table[i];
if (citty == NULL)
continue;
length += sprintf(page + length, "%d\n", i);
if ((length + begin) > (off + count))
goto done;
if ((length + begin) < off)
{
begin += length;
length = 0;
}
}
*eof = 1;
done:
if (off >= (length + begin))
return 0;
*start = page + (off - begin);
F_LEAVE();
return (count < begin + length - off) ? count : begin + length - off;
}
static int citty_read_proc(struct file *filp, char __user *buf, size_t count,
loff_t *f_pos)
{
struct citty_port *citty = NULL;
int length = 0;
int i;
char temp[256] = { 0 };
int rc = -EFAULT;
F_ENTER();
for (i = 0; i < CITTY_TTY_MINORS; ++i) {
citty = citty_table[i];
if (citty == NULL)
continue;
length +=
snprintf(temp + length, sizeof(temp) - length, "%d,", i);
}
if (length > 0)
temp[length - 1] = '\0';
if (length + 1 > count) {
printk(KERN_ERR "%s: error: no enough space.\n", __func__);
goto err_exit;
}
if (copy_to_user(buf, (void *)&temp, length + 1)) {
printk(KERN_ERR "%s: copy_to_user failed.\n", __func__);
goto err_exit;
}
printk(KERN_DEBUG "citty read proc: %s\n", temp);
rc = 0;
err_exit:
F_LEAVE();
return rc;
}
static void citty_set_termios(struct tty_struct *tty,
struct ktermios *old_termios)
{
unsigned int cflag;
F_ENTER();
cflag = tty->termios.c_cflag;
/* check that they really want us to change something */
if (old_termios) {
if ((cflag == old_termios->c_cflag) &&
(RELEVANT_IFLAG(tty->termios.c_iflag) ==
RELEVANT_IFLAG(old_termios->c_iflag))) {
PDEBUG(" - nothing to change...\n");
return;
}
}
/* get the byte size */
switch (cflag & CSIZE) {
case CS5:
PDEBUG(" - data bits = 5\n");
break;
case CS6:
PDEBUG(" - data bits = 6\n");
break;
case CS7:
PDEBUG(" - data bits = 7\n");
break;
default:
case CS8:
PDEBUG(" - data bits = 8\n");
break;
}
/* determine the parity */
if (cflag & PARENB)
if (cflag & PARODD)
PDEBUG(" - parity = odd\n");
else
PDEBUG(" - parity = even\n");
else
PDEBUG(" - parity = none\n");
/* figure out the stop bits requested */
if (cflag & CSTOPB)
PDEBUG(" - stop bits = 2\n");
else
PDEBUG(" - stop bits = 1\n");
/* figure out the hardware flow control settings */
if (cflag & CRTSCTS)
PDEBUG(" - RTS/CTS is enabled\n");
else
PDEBUG(" - RTS/CTS is disabled\n");
/* determine software flow control */
/* if we are implementing XON/XOFF, set the start and
* stop character in the device */
if (I_IXOFF(tty) || I_IXON(tty)) {
/* CHECKPOINT */
/* Invalid code here;
* seems software flow control is not supported
*/
#if 0
unsigned char stop_char = STOP_CHAR(tty);
unsigned char start_char = START_CHAR(tty);
/* if we are implementing INBOUND XON/XOFF */
if (I_IXOFF(tty))
PDEBUG(" - INBOUND XON/XOFF is enabled, " \
"XON = %2x, XOFF = %2x", start_char, stop_char);
else
PDEBUG(" - INBOUND XON/XOFF is disabled");
/* if we are implementing OUTBOUND XON/XOFF */
if (I_IXON(tty))
PDEBUG(" - OUTBOUND XON/XOFF is enabled, " \
"XON = %2x, XOFF = %2x", start_char, stop_char);
else
PDEBUG(" - OUTBOUND XON/XOFF is disabled");
#endif
}
/* get the baud rate wanted */
PDEBUG(" - baud rate = %d", tty_get_baud_rate(tty));
F_LEAVE();
}
