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Message-Id: <201008190938.44532.marek.vasut@gmail.com>
Date: Thu, 19 Aug 2010 09:38:44 +0200
From: Marek Vasut <marek.vasut@...il.com>
To: "Raju Rameshwar Uprade" <rajsingh@...a.tifr.res.in>
Cc: Greg KH <gregkh@...e.de>, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org, maxinbjohn@...il.com,
orest.bond@...postembedded.com, vijaykumar@...ogic.com
Subject: Re: Regarding USB-Serial Device driver
Dne Čt 19. srpna 2010 08:17:30 Raju Rameshwar Uprade napsal(a):
> Dear Sir,
> I am trying to write a Pl2303_mcm.c usb-serial device driver which
> will be able to talk to several devices using RS-485 interface card.I have
> modified the standard pl2303.c by which I am able to enable/disable the
> RTS line.
> I am sending 10 bytes of data to the device, data is going out but instead
> of 10 bytes, device driver is sending a large amount of data as seen on
> Lecroy waverunner oscilloscope. Here I am sending the modified file.
Hi, I have no idea why I'm CCed in this, but anyway.
1) could you please update the driver to a more recent kernel (we are 10 kernel
versions further now)
2) could you please send a diff instead of a whole file? (git diff <file1>
<file2> > diff.diff ... see man git-diff)
Cheers
>
> /* Prolific PL2303 USB to serial adaptor driver which will be able to
> communicate with MCM.....for kernel version 2.6.25.14
> Implementing mcmdriver in pl2303.c */
>
> #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 <linux/usb/serial.h>
> #include <linux/delay.h>
> #define PL2303_VENDOR_ID 0x067b
> #define PL2303_PRODUCT_ID 0x2303
> /*
> * Version Information
> */
> #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
>
> static int debug;
> #define PL2303_CLOSING_WAIT (30*HZ)
>
> /* Original
>
> #define PL2303_BUF_SIZE 1024
> #define PL2303_TMP_BUF_SIZE 1024 */
>
> #define PL2303_BUF_SIZE 100
> #define PL2303_TMP_BUF_SIZE 100
>
> 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) },
> { } /* Terminating entry */
> };
>
> MODULE_DEVICE_TABLE(usb, id_table);
>
> static struct usb_driver pl2303_mcm_driver = {
> .name = "pl2303_mcm",
> .probe = usb_serial_probe,
> .disconnect = usb_serial_disconnect,
> .id_table = id_table,
> .suspend = usb_serial_suspend,
> .resume = usb_serial_resume,
> .no_dynamic_id = 1,
> .supports_autosuspend = 1,
> };
>
> #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
>
> 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; /* spin lock
*/
> struct pl2303_buf *buf;
> int write_urb_in_use;
> wait_queue_head_t delta_msr_wait;
> u8 line_control; /* used as MCR
(
> modem control register */
> u8 line_status; /* used as MSR
> (modem status register ) */
> u8 termios_initialized;
> enum pl2303_type type;
> };
>
> /*
> * 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 = 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 0;
>
> return ((pb->buf_size + pb->buf_put - pb->buf_get) % pb->buf_size);
> }
>
> /*
> * 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 0;
>
> return ((pb->buf_size + pb->buf_get - pb->buf_put - 1) % pb->buf_size);
> }
>
> /*
> * pl2303_buf_put
> *
> * Copy 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) // if count is greater
> than len count = len;
>
> if (count == 0)
> return 0;
>
> len = pb->buf_buf + pb->buf_size - pb->buf_put;
> if (count > len)
> {
> // memcpy - copy memory area
> // void *memcpy(void *dest, const void *src, size_t n);
>
> 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 - copy memory area
> // void *memcpy(void *dest, const void *src, size_t n);
>
> 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 pl2303_vendor_read(__u16 value, __u16 index,
> struct usb_serial *serial, unsigned char *buf)
> {
> int res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
> VENDOR_READ_REQUEST, VENDOR_READ_REQUEST_TYPE,
> value, index, buf, 1, 100);
> dbg("0x%x:0x%x:0x%x:0x%x %d - %x", VENDOR_READ_REQUEST_TYPE,
> VENDOR_READ_REQUEST, value, index, res, buf[0]);
> return res;
> }
>
> static int pl2303_vendor_write(__u16 value, __u16 index,
> struct usb_serial *serial)
> {
> int res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
> VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
> value, index, NULL, 0, 100);
> dbg("0x%x:0x%x:0x%x:0x%x %d", VENDOR_WRITE_REQUEST_TYPE,
> VENDOR_WRITE_REQUEST, value, index, res);
> return res;
> }
>
> static int pl2303_startup(struct usb_serial *serial)
> {
> struct pl2303_private *priv;
> enum pl2303_type type = type_0;
> unsigned char *buf;
> int i;
>
> buf = kmalloc(10, GFP_KERNEL);
> if (buf == NULL)
> return -ENOMEM;
>
> 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 = kzalloc(sizeof(struct pl2303_private), GFP_KERNEL);
> if (!priv)
> goto cleanup;
> 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);
> }
>
> pl2303_vendor_read(0x8484, 0, serial, buf);
> pl2303_vendor_write(0x0404, 0, serial);
> pl2303_vendor_read(0x8484, 0, serial, buf);
> pl2303_vendor_read(0x8383, 0, serial, buf);
> pl2303_vendor_read(0x8484, 0, serial, buf);
> pl2303_vendor_write(0x0404, 1, serial);
> pl2303_vendor_read(0x8484, 0, serial, buf);
> pl2303_vendor_read(0x8383, 0, serial, buf);
> pl2303_vendor_write(0, 1, serial);
> pl2303_vendor_write(1, 0, serial);
> if (type == HX)
> pl2303_vendor_write(2, 0x44, serial);
> else
> pl2303_vendor_write(2, 0x24, serial);
>
> kfree(buf);
> return 0;
>
> cleanup:
> kfree(buf);
> 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", __func__, value, retval);
> return retval;
> }
>
> // struct usb_serial_port include the struct urb which has a variable named
> write_urb .....
>
> 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;
> u8 control;
> // int on = 1;
> dbg("%s - port %d", __func__, port->number);
>
> spin_lock_irqsave(&priv->lock, flags);
>
> if (priv->write_urb_in_use)
> {
> spin_unlock_irqrestore(&priv->lock, flags);
> return;
> }
>
> // transfer_buffer This identifies the buffer to (or from) which the I/O
> request will be performed (unless URB_NO_TRANSFER_DMA_MAP is set). This
> buffer must be suitable for DMA;
> // ALLOCATE IT WITH KMALLOC OR EQUIVALENT. For transfers to ``in''
> endpoints, contents of this buffer will be modified. This buffer is used
> for the data stage of control transfers.
> // bulk_out_size : the size of the bulk_out_buffer, in bytes
>
> 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);
>
> /* spin_lock_irqsave(&priv->lock, flags);
> if (on)
> priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
> else
> priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
> control = priv->line_control;
> spin_unlock_irqrestore(&priv->lock, flags);
> set_control_lines(port->serial->dev, control); */
>
> usb_serial_debug_data(debug, &port->dev, __func__,
> count,port->write_urb->transfer_buffer);
>
> // port->write_urb->transfer_buffer_length = count;
> port->write_urb->transfer_buffer_length = count; // this value
> matters a lot .....
> port->write_urb->dev = port->serial->dev;
> result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
>
> // Following Code hangs the PC
> /* mdelay(10);
> spin_lock_irqsave(&priv->lock,flags);
> priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
> control = priv->line_control;
> spin_unlock_irqrestore(&priv->lock, flags);
> set_control_lines(port->serial->dev, control); */
> if (result)
> {
> dev_err(&port->dev, "%s - failed submitting write urb,""
error
> %d\n", __func__, result);
> priv->write_urb_in_use = 0;
> // TODO: reschedule pl2303_send
> }
>
> usb_serial_port_softint(port);
>
> /* spin_lock_irqsave(&priv->lock,flags);
> priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
> control = priv->line_control;
> spin_unlock_irqrestore(&priv->lock, flags);
> set_control_lines(port->serial->dev, control); */
> }
>
> 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;
> u8 control;
> dbg("%s - port %d, %d bytes", __func__, port->number, count);
>
> if (!count)
> return count;
>
> // Following code is included so that We can enable the RTS line to
> high before data transmission
> // Tried writing a for loop here to loop the RTS line
> enable/disable , but that also didn't work...
>
> spin_lock_irqsave(&priv->lock, flags);
> priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
> control = priv->line_control;
> spin_unlock_irqrestore(&priv->lock, flags);
> set_control_lines(port->serial->dev, control);
>
> spin_lock_irqsave(&priv->lock, flags);
> count = pl2303_buf_put(priv->buf, buf, count);
> spin_unlock_irqrestore(&priv->lock, flags);
>
> pl2303_send(port); // If I comment
> this , driver dosen't work
>
> // Following code is included so that We can disable the RTS line to
low
> after data transmission..
> // mdelay plays an Important role here....
> mdelay(5);
> spin_lock_irqsave(&priv->lock, flags);
> // priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); // this
> doesn't work here... priv->line_control = 0; // this work here.....
> control = priv->line_control;
> spin_unlock_irqrestore(&priv->lock, flags);
> set_control_lines(port->serial->dev,control);
>
> return count; // count is also very IMP b'coz it affect the
> device driver's behaviour.....
> }
>
> // Write_room---> The function that indicates how much of
> the buffer is free. 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", __func__, 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", __func__, room);
> return room;
> }
>
> // chars_in_buffer------> The function that indicates how much of the
> buffer is full of data.
> 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", __func__, 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", __func__, chars);
> return chars;
> }
>
> static void pl2303_set_termios(struct usb_serial_port *port,struct ktermios
> *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", __func__, port->number);
>
> //printk(KERN_ALERT "I M in Set Termios\n");
>
> spin_lock_irqsave(&priv->lock, flags);
> if (!priv->termios_initialized) {
> *(port->tty->termios) = tty_std_termios;
>
> /* HUPCL----> Lower modem control lines after last process closes the
> device (hang up). CLOCAL----> Ignore modem control lines.
> CLOCAL------> Ignore modem control lines.
> CREAD---------> Enable receiver. */
>
> port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
> CLOCAL; port->tty->termios->c_ispeed = 9600;
> port->tty->termios->c_ospeed = 9600;
> priv->termios_initialized = 1;
> }
> spin_unlock_irqrestore(&priv->lock, flags);
>
> /* The PL2303 is reported to lose bytes if you change
> serial settings even to the same values as before. Thus
> we actually need to filter in this specific case */
>
> if (!tty_termios_hw_change(port->tty->termios, old_termios))
> return;
>
> cflag = port->tty->termios->c_cflag;
>
> buf = kzalloc(7, GFP_KERNEL);
> if (!buf) {
> dev_err(&port->dev, "%s - out of memory.\n", __func__);
> /* Report back no change occurred */
> *port->tty->termios = *old_termios;
> return;
> }
>
> 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", __func__, buf[6]);
> }
>
> baud = tty_get_baud_rate(port->tty);;
> dbg("%s - baud = %d", __func__, 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", __func__);
> } else {
> buf[4] = 0;
> dbg("%s - stop bits = 1", __func__);
> }
>
> 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", __func__);
> } else {
> buf[5] = 2;
> dbg("%s - parity = even", __func__);
> }
> } else {
> buf[5] = 0;
> dbg("%s - parity = none", __func__);
> }
>
> 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;
>
> /* The zero baud rate, B0, is used to terminate the connection. If B0 is
> specified, the modem control lines shall no longer be asserted. Normally,
> this will disconnect the line */
>
> 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) {
> if (priv->type == HX)
> pl2303_vendor_write(0x0, 0x61, serial);
> else
> pl2303_vendor_write(0x0, 0x41, serial);
> } else {
> pl2303_vendor_write(0x0, 0x0, serial);
> }
>
> /* FIXME: Need to read back resulting baud rate */
> if (baud)
> tty_encode_baud_rate(port->tty, baud, baud);
>
> kfree(buf);
> }
>
> /*************
> static void pl2303_dtr_rts(struct usb_serial_port *port, int on)
> {
> struct pl2303_private *priv = usb_get_serial_port_data(port);
> unsigned long flags;
> u8 control;
>
> spin_lock_irqsave(&priv->lock, flags);
> // Change DTR and RTS
> if (on)
> priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
> else
> priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
> control = priv->line_control;
> spin_unlock_irqrestore(&priv->lock, flags);
> set_control_lines(port->serial->dev, control);
> }
> *************/
> 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", __func__, port->number);
> // Tried to comment from here upto
> schedule_timeout_interruptible(timeout); ..but it doesn't make any
> diffrence...5/8/10
> //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) ||
> port->serial->disconnected)
> 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 is greater than 1200
> if (bps > 1200)
> timeout = max((HZ*2560)/bps,HZ/10);
> else
> timeout = 2*HZ;
> schedule_timeout_interruptible(timeout);
>
> /* shutdown our urbs */
> dbg("%s - shutting down urbs", __func__);
> 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_open(struct usb_serial_port *port, struct file *filp)
> {
> struct ktermios tmp_termios;
> struct usb_serial *serial = port->serial;
> struct pl2303_private *priv = usb_get_serial_port_data(port);
> int result;
> int on =1;
> // trying to implemet RTS/DTR line settings -------> Raj date
> 14.07.2010
>
> u8 control;
> unsigned long flags;
> dbg("%s - port %d", __func__, port->number);
>
> if (priv->type != HX) {
> usb_clear_halt(serial->dev, port->write_urb->pipe);
> usb_clear_halt(serial->dev, port->read_urb->pipe);
> } else {
> // reset upstream data pipes
> pl2303_vendor_write(8, 0, serial);
> pl2303_vendor_write(9, 0, serial);
> }
>
> /* Setup termios */
> if (port->tty) {
> pl2303_set_termios(port, &tmp_termios);
> }
>
> //FIXME: need to assert RTS and DTR if CRTSCTS off
> // CRTSCTS -----> Hardware flow control settings......
> // code written for RTS line setting
> // Change DTR and RTS
> // if on =1 ------------> LED glows
> // if on = 0 -------------> LED doesn't glow
> //printk(KERN_ALERT "I M just before RTS\n");
> spin_lock_irqsave(&priv->lock, flags);
> if (on)
> priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
> else
> priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
> control = priv->line_control;
> spin_unlock_irqrestore(&priv->lock, flags);
> set_control_lines(port->serial->dev, control);
> // printk(KERN_ALERT "I M just before RTS\n"); */
>
> /* *********************** Code written as per Shri RBS
> guidlines....... Date 26/07/2010 ************/
>
> /* spin_lock_irqsave(&priv->lock,flags);
> priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
> control = priv->line_control;
> spin_unlock_irqrestore(&priv->lock, flags);
> set_control_lines(port->serial->dev, control);
> mdelay(50);
> spin_lock_irqsave(&priv->lock,flags);
> priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
> control = priv->line_control;
> spin_unlock_irqrestore(&priv->lock, flags);
> set_control_lines(port->serial->dev, control); */
>
> dbg("%s - submitting read urb", __func__);
> 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",
> __func__, result); pl2303_close(port, NULL);
> return -EPROTO;
> }
>
> dbg("%s - submitting interrupt urb", __func__);
> 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",
> __func__, result);
> pl2303_close(port, NULL);
> return -EPROTO;
> }
>
> // Following code snippet is able to disable RTS line......need to
> find out where 2 place this code....( Date 27/7/2010 )
> // printk(KERN_ALERT "I M just before Mdelay\n");
> /* mdelay(10);
> spin_lock_irqsave(&priv->lock,flags);
> priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
> control = priv->line_control;
> spin_unlock_irqrestore(&priv->lock, flags);
> set_control_lines(port->serial->dev, control); */
> return 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; /* mcr ( priv->
line_control =
> 1 */ if (set & TIOCM_DTR)
> priv->line_control |= CONTROL_DTR; /* mcr ( priv->
line_control =
> 1 */ if (clear & TIOCM_RTS)
> priv->line_control &= ~CONTROL_RTS; /* mcr ( priv->
line_control = 0
> */ if (clear & TIOCM_DTR)
> priv->line_control &= ~CONTROL_DTR; /* mcr ( priv->
line_control = 0
> */
>
> 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)", __func__, port->number);
>
> if (!usb_get_intfdata(port->serial->interface))
> return -ENODEV;
>
> spin_lock_irqsave(&priv->lock, flags);
> mcr = priv->line_control; /* Modem control register
> */ status = priv->line_status; /* Modem status register
> */ spin_unlock_irqrestore(&priv->lock, flags);
>
> result = ((mcr & CONTROL_DTR)? TIOCM_DTR : 0) /* DTR is set */
>
> | ((mcr & CONTROL_RTS) ? TIOCM_RTS : 0) /* RTS is
set */
> | ((status & UART_CTS) ? TIOCM_CTS : 0) /* CTS is
set */
> | ((status & UART_DSR) ? TIOCM_DSR : 0) /* DSR is
set */
> | ((status & UART_RING) ? TIOCM_RI : 0) /*
RING INDICATOR is
> | set */ ((status & UART_DCD) ? TIOCM_CD : 0); /*
CARRIER
> | DETECT is set */
>
> dbg("%s - result = %x", __func__, result);
>
> return result;
> }
>
> /*******
> static int pl2303_carrier_raised(struct usb_serial_port *port)
> {
> struct pl2303_private *priv = usb_get_serial_port_data(port);
> if (priv->line_status & UART_DCD)
> return 1;
> return 0;
> }
> *********/
>
> /* TIOCMIWAIT ------>Waits for MSR change. The user asks for this ioctl in
> the unusual circumstances that it wants to sleep within the kernel until
> something happens to the MSR register of
the
> tty device.
> The arg parameter contains the type of event that the user is waiting for.
> This is commonly used to wait until a status line changes, signaling that
> more data is ready to be sent to the device.
> Be careful when implementing this ioctl, and do not use the
> interruptible_sleep_on call, as it is unsafe (there are lots of nasty race
> conditions involved with it). Instead, a wait_queue should be used to
> avoid these problems. */
>
> 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", __func__, port->number, cmd);
>
> switch (cmd) {
> case TIOCMIWAIT: /* Waits for the MSR register change */
> dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
> return wait_modem_info(port, arg);
>
> default:
> dbg("%s not supported = 0x%04x", __func__, 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", __func__, port->number);
>
> if (break_state == 0)
> state = BREAK_OFF;
> else
> state = BREAK_ON;
> dbg("%s - turning break %s", __func__, 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", __func__, result);
> }
>
> static void pl2303_shutdown(struct usb_serial *serial)
> {
> int i;
> struct pl2303_private *priv;
>
> dbg("%s", __func__);
>
> 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);
> }
> }
> }
>
> /* Somewhere in the tty driver’s code that recognizes that the MSR
> register changes, the following line must be called for this code to work
> properly:
> wake_up_interruptible(&tp->wait); */
>
> 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 + 1;
> u16 idv, idp;
>
> idv = le16_to_cpu(port->serial->dev->descriptor.idVendor);
> idp = le16_to_cpu(port->serial->dev->descriptor.idProduct);
>
> /* 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);
> wake_up_interruptible(&priv->delta_msr_wait);
> }
>
> /* urb Callback Function Pointers
>
> The read_int_callback, read_bulk_callback and write_bulk_callback function
> pointers are all used by the USB serial core to set up the initial
> callbacks for these kinds of USB endpoints. If the driver does not specify
> the read or write bulk callback functions, the generic callbacks are used.
> There is no generic read interrupt callback function, so if your device
> has an interrupt endpoint, you must provide this callback.
>
> The operation of the generic read bulk callback adds the data received by
> the USB urb to the port's tty buffer, to be sent to user space when read()
> is called. It then resubmits the urb to the device. If your device does
> not need to interpret the data received in any way, I recommend using this
> function instead of writing a new one. The generic bulk write callback is
> much smaller and only wakes up the tty layer (in case it was sleeping,
> waiting for data to be transmitted to the device).
> */
>
> static void pl2303_read_int_callback(struct urb *urb)
> {
> struct usb_serial_port *port = urb->context;
> unsigned char *data = urb->transfer_buffer;
> unsigned int actual_length = urb->actual_length;
> int status = urb->status;
> int retval;
>
> dbg("%s (%d)", __func__, port->number);
>
> switch (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", __func__,
> status);
> return;
> default:
> dbg("%s - nonzero urb status received: %d", __func__,status);
> goto exit;
> }
>
> usb_serial_debug_data(debug, &port->dev, __func__, urb->actual_length,
> urb->transfer_buffer);
>
> pl2303_update_line_status(port, data, actual_length); // data == 0 PC
get
> hanged.
>
> exit:
> retval = usb_submit_urb(urb, GFP_ATOMIC);
> if (retval)
> dev_err(&urb->dev->dev,"%s - usb_submit_urb failed with result
> %d\n",__func__, retval); }
>
> static void pl2303_read_bulk_callback(struct urb *urb)
> {
> struct usb_serial_port *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;
> int status = urb->status;
> u8 line_status;
> // u8 control;
> char tty_flag;
>
> dbg("%s - port %d", __func__, port->number);
>
> if (status)
> {
> dbg("%s - urb status = %d", __func__, status);
> if (!port->open_count)
> {
> dbg("%s - port is closed, exiting.", __func__);
> return;
> }
> if (status == -EPROTO)
> {
> /* PL2303 mysteriously fails with -EPROTO reschedule
the read */
> dbg("%s - caught -EPROTO, resubmitting the urb",
> __func__);
> 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",__func__, result);
> return;
> }
>
> dbg("%s - unable to handle the error, exiting.",
> __func__); return;
> }
>
> usb_serial_debug_data(debug, &port->dev, __func__,urb->actual_length,
> data);
>
> /* get tty_flag from status */
> tty_flag = TTY_NORMAL;
> spin_lock_irqsave(&priv->lock, flags);
> line_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 (line_status & UART_BREAK_ERROR )
> tty_flag = TTY_BREAK;
> else if (line_status & UART_PARITY_ERROR)
> tty_flag = TTY_PARITY;
> else if (line_status & UART_FRAME_ERROR)
> tty_flag = TTY_FRAME;
> dbg("%s - tty_flag = %d", __func__, tty_flag);
>
> tty = port->tty;
> if (tty && urb->actual_length) {
> tty_buffer_request_room(tty, urb->actual_length + 1);
> /* overrun is special, not associated with a char */
> if (line_status & UART_OVERRUN_ERROR)
> tty_insert_flip_char(tty, 0, TTY_OVERRUN);
> for (i = 0; i < urb->actual_length; ++i)
> 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", __func__, result);
> } */
> // mdelay(5);
> return;
> }
>
> // Implementation of pl2303_write_bulk_callback merely reports if the urb
> was completed successfully or not and then returns.
>
> static void pl2303_write_bulk_callback(struct urb *urb)
> {
> struct usb_serial_port *port = urb->context;
> struct pl2303_private *priv = usb_get_serial_port_data(port);
> int result;
> int status = urb->status;
>
> dbg("%s - port %d", __func__, port->number);
>
> switch (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",
__func__, status);
> priv->write_urb_in_use = 0;
> return;
>
> default:
> /* error in the urb, so we have to resubmit it */
> dbg("%s - Overflow in write", __func__);
> dbg("%s - nonzero write bulk status received: %d",
__func__,status);
>
> // Original is this
> /* port->write_urb->transfer_buffer_length = 1;
> port->write_urb->dev = port->serial->dev; */
>
> // I m trying date 2/08/2010
> port->write_urb->transfer_buffer_length = 1;
> port->write_urb->dev = port->serial->dev;
> result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
>
> //Below sentence Hangs the PC....We need 2 restart the PC.
> // result = usb_submit_urb(0, GFP_ATOMIC);
> if (result)
> dev_err(&urb->dev->dev, "%s - failed resubmitting
write"" urb, error
> %d\n", __func__, result);
> else
> return;
> }
>
> priv->write_urb_in_use = 0;
>
> /* send any buffered data */
> pl2303_send(port);
> }
>
> /* All of the device info needed for the PL2303 SIO serial converter */
> static struct usb_serial_driver pl2303_mcm_device = {
> .driver = {
> .owner = THIS_MODULE,
> .name = "pl2303_mcm",
> },
> .id_table = id_table,
> .usb_driver = &pl2303_mcm_driver,
> .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,
//
> tried commenting write_bulk_callback bt nothing was going out....
> .write_room = pl2303_write_room,
> .chars_in_buffer = pl2303_chars_in_buffer,
> .attach = pl2303_startup,
> .shutdown = pl2303_shutdown,
> };
>
> static int __init pl2303_init(void)
> {
> int retval;
>
> retval = usb_serial_register(&pl2303_mcm_device);
> if (retval)
> goto failed_usb_serial_register;
> retval = usb_register(&pl2303_mcm_driver);
> if (retval)
> goto failed_usb_register;
> info(DRIVER_DESC);
> return 0;
> failed_usb_register:
> usb_serial_deregister(&pl2303_mcm_device);
> failed_usb_serial_register:
> return retval;
> }
>
> static void __exit pl2303_exit(void)
> {
> usb_deregister(&pl2303_mcm_driver);
> usb_serial_deregister(&pl2303_mcm_device);
> }
>
> module_init(pl2303_init);
> module_exit(pl2303_exit);
>
> MODULE_DESCRIPTION(DRIVER_DESC);
> MODULE_LICENSE("GPL");
>
> module_param(debug, bool, S_IRUGO | S_IWUSR);
> MODULE_PARM_DESC(debug, "Debug enabled or not");
>
> kindly Help me sir.
>
> Thanks & Regards,
> Raju
> ------- End of Forwarded Message -------
>
>
> --
> Open WebMail Project (http://openwebmail.org)
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