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linux/drivers/usb/serial/cypress_m8.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

1725 lines
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/*
* USB Cypress M8 driver
*
* Copyright (C) 2004
* Lonnie Mendez (dignome@gmail.com)
* Copyright (C) 2003,2004
* Neil Whelchel (koyama@firstlight.net)
*
* 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
*
* See http://geocities.com/i0xox0i for information on this driver and the
* earthmate usb device.
*
* Lonnie Mendez <dignome@gmail.com>
* 4-29-2005
* Fixed problem where setting or retreiving the serial config would fail with
* EPIPE. Removed CRTS toggling so the driver behaves more like other usbserial
* adapters. Issued new interval of 1ms instead of the default 10ms. As a
* result, transfer speed has been substantially increased. From avg. 850bps to
* avg. 3300bps. initial termios has also been modified. Cleaned up code and
* formatting issues so it is more readable. Replaced the C++ style comments.
*
* Lonnie Mendez <dignome@gmail.com>
* 12-15-2004
* Incorporated write buffering from pl2303 driver. Fixed bug with line
* handling so both lines are raised in cypress_open. (was dropping rts)
* Various code cleanups made as well along with other misc bug fixes.
*
* Lonnie Mendez <dignome@gmail.com>
* 04-10-2004
* Driver modified to support dynamic line settings. Various improvments
* and features.
*
* Neil Whelchel
* 10-2003
* Driver first released.
*
*/
/* Thanks to Neil Whelchel for writing the first cypress m8 implementation for linux. */
/* Thanks to cypress for providing references for the hid reports. */
/* Thanks to Jiang Zhang for providing links and for general help. */
/* Code originates and was built up from ftdi_sio, belkin, pl2303 and others. */
#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/module.h>
#include <linux/moduleparam.h>
#include <linux/spinlock.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/serial.h>
#include <linux/delay.h>
#include <asm/uaccess.h>
#include "cypress_m8.h"
#ifdef CONFIG_USB_SERIAL_DEBUG
static int debug = 1;
#else
static int debug;
#endif
static int stats;
static int interval;
/*
* Version Information
*/
#define DRIVER_VERSION "v1.09"
#define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
#define DRIVER_DESC "Cypress USB to Serial Driver"
/* write buffer size defines */
#define CYPRESS_BUF_SIZE 1024
#define CYPRESS_CLOSING_WAIT (30*HZ)
static struct usb_device_id id_table_earthmate [] = {
{ USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
{ USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
{ } /* Terminating entry */
};
static struct usb_device_id id_table_cyphidcomrs232 [] = {
{ USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
{ } /* Terminating entry */
};
static struct usb_device_id id_table_nokiaca42v2 [] = {
{ USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
{ } /* Terminating entry */
};
static struct usb_device_id id_table_combined [] = {
{ USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
{ USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
{ USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
{ USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
{ } /* Terminating entry */
};
MODULE_DEVICE_TABLE (usb, id_table_combined);
static struct usb_driver cypress_driver = {
.name = "cypress",
.probe = usb_serial_probe,
.disconnect = usb_serial_disconnect,
.id_table = id_table_combined,
.no_dynamic_id = 1,
};
struct cypress_private {
spinlock_t lock; /* private lock */
int chiptype; /* identifier of device, for quirks/etc */
int bytes_in; /* used for statistics */
int bytes_out; /* used for statistics */
int cmd_count; /* used for statistics */
int cmd_ctrl; /* always set this to 1 before issuing a command */
struct cypress_buf *buf; /* write buffer */
int write_urb_in_use; /* write urb in use indicator */
int write_urb_interval; /* interval to use for write urb */
int read_urb_interval; /* interval to use for read urb */
int comm_is_ok; /* true if communication is (still) ok */
int termios_initialized;
__u8 line_control; /* holds dtr / rts value */
__u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
__u8 current_config; /* stores the current configuration byte */
__u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
int baud_rate; /* stores current baud rate in integer form */
int cbr_mask; /* stores current baud rate in masked form */
int isthrottled; /* if throttled, discard reads */
wait_queue_head_t delta_msr_wait; /* used for TIOCMIWAIT */
char prev_status, diff_status; /* used for TIOCMIWAIT */
/* we pass a pointer to this as the arguement sent to cypress_set_termios old_termios */
struct termios tmp_termios; /* stores the old termios settings */
};
/* write buffer structure */
struct cypress_buf {
unsigned int buf_size;
char *buf_buf;
char *buf_get;
char *buf_put;
};
/* function prototypes for the Cypress USB to serial device */
static int cypress_earthmate_startup (struct usb_serial *serial);
static int cypress_hidcom_startup (struct usb_serial *serial);
static int cypress_ca42v2_startup (struct usb_serial *serial);
static void cypress_shutdown (struct usb_serial *serial);
static int cypress_open (struct usb_serial_port *port, struct file *filp);
static void cypress_close (struct usb_serial_port *port, struct file *filp);
static int cypress_write (struct usb_serial_port *port, const unsigned char *buf, int count);
static void cypress_send (struct usb_serial_port *port);
static int cypress_write_room (struct usb_serial_port *port);
static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
static void cypress_set_termios (struct usb_serial_port *port, struct termios * old);
static int cypress_tiocmget (struct usb_serial_port *port, struct file *file);
static int cypress_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
static int cypress_chars_in_buffer (struct usb_serial_port *port);
static void cypress_throttle (struct usb_serial_port *port);
static void cypress_unthrottle (struct usb_serial_port *port);
static void cypress_set_dead (struct usb_serial_port *port);
static void cypress_read_int_callback (struct urb *urb);
static void cypress_write_int_callback (struct urb *urb);
/* baud helper functions */
static int mask_to_rate (unsigned mask);
static unsigned rate_to_mask (int rate);
/* write buffer functions */
static struct cypress_buf *cypress_buf_alloc(unsigned int size);
static void cypress_buf_free(struct cypress_buf *cb);
static void cypress_buf_clear(struct cypress_buf *cb);
static unsigned int cypress_buf_data_avail(struct cypress_buf *cb);
static unsigned int cypress_buf_space_avail(struct cypress_buf *cb);
static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf, unsigned int count);
static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf, unsigned int count);
static struct usb_serial_driver cypress_earthmate_device = {
.driver = {
.owner = THIS_MODULE,
.name = "earthmate",
},
.description = "DeLorme Earthmate USB",
.id_table = id_table_earthmate,
.num_interrupt_in = 1,
.num_interrupt_out = 1,
.num_bulk_in = NUM_DONT_CARE,
.num_bulk_out = NUM_DONT_CARE,
.num_ports = 1,
.attach = cypress_earthmate_startup,
.shutdown = cypress_shutdown,
.open = cypress_open,
.close = cypress_close,
.write = cypress_write,
.write_room = cypress_write_room,
.ioctl = cypress_ioctl,
.set_termios = cypress_set_termios,
.tiocmget = cypress_tiocmget,
.tiocmset = cypress_tiocmset,
.chars_in_buffer = cypress_chars_in_buffer,
.throttle = cypress_throttle,
.unthrottle = cypress_unthrottle,
.read_int_callback = cypress_read_int_callback,
.write_int_callback = cypress_write_int_callback,
};
static struct usb_serial_driver cypress_hidcom_device = {
.driver = {
.owner = THIS_MODULE,
.name = "cyphidcom",
},
.description = "HID->COM RS232 Adapter",
.id_table = id_table_cyphidcomrs232,
.num_interrupt_in = 1,
.num_interrupt_out = 1,
.num_bulk_in = NUM_DONT_CARE,
.num_bulk_out = NUM_DONT_CARE,
.num_ports = 1,
.attach = cypress_hidcom_startup,
.shutdown = cypress_shutdown,
.open = cypress_open,
.close = cypress_close,
.write = cypress_write,
.write_room = cypress_write_room,
.ioctl = cypress_ioctl,
.set_termios = cypress_set_termios,
.tiocmget = cypress_tiocmget,
.tiocmset = cypress_tiocmset,
.chars_in_buffer = cypress_chars_in_buffer,
.throttle = cypress_throttle,
.unthrottle = cypress_unthrottle,
.read_int_callback = cypress_read_int_callback,
.write_int_callback = cypress_write_int_callback,
};
static struct usb_serial_driver cypress_ca42v2_device = {
.driver = {
.owner = THIS_MODULE,
.name = "nokiaca42v2",
},
.description = "Nokia CA-42 V2 Adapter",
.id_table = id_table_nokiaca42v2,
.num_interrupt_in = 1,
.num_interrupt_out = 1,
.num_bulk_in = NUM_DONT_CARE,
.num_bulk_out = NUM_DONT_CARE,
.num_ports = 1,
.attach = cypress_ca42v2_startup,
.shutdown = cypress_shutdown,
.open = cypress_open,
.close = cypress_close,
.write = cypress_write,
.write_room = cypress_write_room,
.ioctl = cypress_ioctl,
.set_termios = cypress_set_termios,
.tiocmget = cypress_tiocmget,
.tiocmset = cypress_tiocmset,
.chars_in_buffer = cypress_chars_in_buffer,
.throttle = cypress_throttle,
.unthrottle = cypress_unthrottle,
.read_int_callback = cypress_read_int_callback,
.write_int_callback = cypress_write_int_callback,
};
/*****************************************************************************
* Cypress serial helper functions
*****************************************************************************/
/* This function can either set or retrieve the current serial line settings */
static int cypress_serial_control (struct usb_serial_port *port, unsigned baud_mask, int data_bits, int stop_bits,
int parity_enable, int parity_type, int reset, int cypress_request_type)
{
int new_baudrate = 0, retval = 0, tries = 0;
struct cypress_private *priv;
__u8 feature_buffer[8];
unsigned long flags;
dbg("%s", __FUNCTION__);
priv = usb_get_serial_port_data(port);
if (!priv->comm_is_ok)
return -ENODEV;
switch(cypress_request_type) {
case CYPRESS_SET_CONFIG:
/*
* The general purpose firmware for the Cypress M8 allows for a maximum speed
* of 57600bps (I have no idea whether DeLorme chose to use the general purpose
* firmware or not), if you need to modify this speed setting for your own
* project please add your own chiptype and modify the code likewise. The
* Cypress HID->COM device will work successfully up to 115200bps (but the
* actual throughput is around 3kBps).
*/
if (baud_mask != priv->cbr_mask) {
dbg("%s - baud rate is changing", __FUNCTION__);
if ( priv->chiptype == CT_EARTHMATE ) {
/* 300 and 600 baud rates are supported under the generic firmware,
* but are not used with NMEA and SiRF protocols */
if ( (baud_mask == B300) || (baud_mask == B600) ) {
err("%s - failed setting baud rate, unsupported speed",
__FUNCTION__);
new_baudrate = priv->baud_rate;
} else if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
err("%s - failed setting baud rate, unsupported speed",
__FUNCTION__);
new_baudrate = priv->baud_rate;
}
} else if (priv->chiptype == CT_CYPHIDCOM) {
if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
err("%s - failed setting baud rate, unsupported speed",
__FUNCTION__);
new_baudrate = priv->baud_rate;
}
} else if (priv->chiptype == CT_CA42V2) {
if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
err("%s - failed setting baud rate, unsupported speed",
__FUNCTION__);
new_baudrate = priv->baud_rate;
}
} else if (priv->chiptype == CT_GENERIC) {
if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
err("%s - failed setting baud rate, unsupported speed",
__FUNCTION__);
new_baudrate = priv->baud_rate;
}
} else {
info("%s - please define your chiptype", __FUNCTION__);
new_baudrate = priv->baud_rate;
}
} else { /* baud rate not changing, keep the old */
new_baudrate = priv->baud_rate;
}
dbg("%s - baud rate is being sent as %d", __FUNCTION__, new_baudrate);
memset(feature_buffer, 0, 8);
/* fill the feature_buffer with new configuration */
*((u_int32_t *)feature_buffer) = new_baudrate;
feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
/* 1 bit gap */
feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
/* 1 bit gap */
feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
dbg("%s - device is being sent this feature report:", __FUNCTION__);
dbg("%s - %02X - %02X - %02X - %02X - %02X", __FUNCTION__, feature_buffer[0], feature_buffer[1],
feature_buffer[2], feature_buffer[3], feature_buffer[4]);
do {
retval = usb_control_msg (port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
HID_REQ_SET_REPORT, USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
0x0300, 0, feature_buffer, 8, 500);
if (tries++ >= 3)
break;
} while (retval != 8 && retval != -ENODEV);
if (retval != 8) {
err("%s - failed sending serial line settings - %d", __FUNCTION__, retval);
cypress_set_dead(port);
} else {
spin_lock_irqsave(&priv->lock, flags);
priv->baud_rate = new_baudrate;
priv->cbr_mask = baud_mask;
priv->current_config = feature_buffer[4];
spin_unlock_irqrestore(&priv->lock, flags);
}
break;
case CYPRESS_GET_CONFIG:
dbg("%s - retreiving serial line settings", __FUNCTION__);
/* set initial values in feature buffer */
memset(feature_buffer, 0, 8);
do {
retval = usb_control_msg (port->serial->dev, usb_rcvctrlpipe(port->serial->dev, 0),
HID_REQ_GET_REPORT, USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
0x0300, 0, feature_buffer, 8, 500);
if (tries++ >= 3)
break;
} while (retval != 5 && retval != -ENODEV);
if (retval != 5) {
err("%s - failed to retrieve serial line settings - %d", __FUNCTION__, retval);
cypress_set_dead(port);
return retval;
} else {
spin_lock_irqsave(&priv->lock, flags);
/* store the config in one byte, and later use bit masks to check values */
priv->current_config = feature_buffer[4];
priv->baud_rate = *((u_int32_t *)feature_buffer);
if ( (priv->cbr_mask = rate_to_mask(priv->baud_rate)) == 0x40)
dbg("%s - failed setting the baud mask (not defined)", __FUNCTION__);
spin_unlock_irqrestore(&priv->lock, flags);
}
}
spin_lock_irqsave(&priv->lock, flags);
++priv->cmd_count;
spin_unlock_irqrestore(&priv->lock, flags);
return retval;
} /* cypress_serial_control */
static void cypress_set_dead(struct usb_serial_port *port)
{
struct cypress_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
if (!priv->comm_is_ok) {
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
priv->comm_is_ok = 0;
spin_unlock_irqrestore(&priv->lock, flags);
err("cypress_m8 suspending failing port %d - interval might be too short",
port->number);
}
/* given a baud mask, it will return integer baud on success */
static int mask_to_rate (unsigned mask)
{
int rate;
switch (mask) {
case B0: rate = 0; break;
case B300: rate = 300; break;
case B600: rate = 600; break;
case B1200: rate = 1200; break;
case B2400: rate = 2400; break;
case B4800: rate = 4800; break;
case B9600: rate = 9600; break;
case B19200: rate = 19200; break;
case B38400: rate = 38400; break;
case B57600: rate = 57600; break;
case B115200: rate = 115200; break;
default: rate = -1;
}
return rate;
}
static unsigned rate_to_mask (int rate)
{
unsigned mask;
switch (rate) {
case 0: mask = B0; break;
case 300: mask = B300; break;
case 600: mask = B600; break;
case 1200: mask = B1200; break;
case 2400: mask = B2400; break;
case 4800: mask = B4800; break;
case 9600: mask = B9600; break;
case 19200: mask = B19200; break;
case 38400: mask = B38400; break;
case 57600: mask = B57600; break;
case 115200: mask = B115200; break;
default: mask = 0x40;
}
return mask;
}
/*****************************************************************************
* Cypress serial driver functions
*****************************************************************************/
static int generic_startup (struct usb_serial *serial)
{
struct cypress_private *priv;
struct usb_serial_port *port = serial->port[0];
dbg("%s - port %d", __FUNCTION__, port->number);
priv = kzalloc(sizeof (struct cypress_private), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->comm_is_ok = !0;
spin_lock_init(&priv->lock);
priv->buf = cypress_buf_alloc(CYPRESS_BUF_SIZE);
if (priv->buf == NULL) {
kfree(priv);
return -ENOMEM;
}
init_waitqueue_head(&priv->delta_msr_wait);
usb_reset_configuration (serial->dev);
priv->cmd_ctrl = 0;
priv->line_control = 0;
priv->termios_initialized = 0;
priv->rx_flags = 0;
priv->cbr_mask = B300;
if (interval > 0) {
priv->write_urb_interval = interval;
priv->read_urb_interval = interval;
dbg("%s - port %d read & write intervals forced to %d",
__FUNCTION__,port->number,interval);
} else {
priv->write_urb_interval = port->interrupt_out_urb->interval;
priv->read_urb_interval = port->interrupt_in_urb->interval;
dbg("%s - port %d intervals: read=%d write=%d",
__FUNCTION__,port->number,
priv->read_urb_interval,priv->write_urb_interval);
}
usb_set_serial_port_data(port, priv);
return 0;
}
static int cypress_earthmate_startup (struct usb_serial *serial)
{
struct cypress_private *priv;
dbg("%s", __FUNCTION__);
if (generic_startup(serial)) {
dbg("%s - Failed setting up port %d", __FUNCTION__,
serial->port[0]->number);
return 1;
}
priv = usb_get_serial_port_data(serial->port[0]);
priv->chiptype = CT_EARTHMATE;
return 0;
} /* cypress_earthmate_startup */
static int cypress_hidcom_startup (struct usb_serial *serial)
{
struct cypress_private *priv;
dbg("%s", __FUNCTION__);
if (generic_startup(serial)) {
dbg("%s - Failed setting up port %d", __FUNCTION__,
serial->port[0]->number);
return 1;
}
priv = usb_get_serial_port_data(serial->port[0]);
priv->chiptype = CT_CYPHIDCOM;
return 0;
} /* cypress_hidcom_startup */
static int cypress_ca42v2_startup (struct usb_serial *serial)
{
struct cypress_private *priv;
dbg("%s", __FUNCTION__);
if (generic_startup(serial)) {
dbg("%s - Failed setting up port %d", __FUNCTION__,
serial->port[0]->number);
return 1;
}
priv = usb_get_serial_port_data(serial->port[0]);
priv->chiptype = CT_CA42V2;
return 0;
} /* cypress_ca42v2_startup */
static void cypress_shutdown (struct usb_serial *serial)
{
struct cypress_private *priv;
dbg ("%s - port %d", __FUNCTION__, serial->port[0]->number);
/* all open ports are closed at this point */
priv = usb_get_serial_port_data(serial->port[0]);
if (priv) {
cypress_buf_free(priv->buf);
kfree(priv);
usb_set_serial_port_data(serial->port[0], NULL);
}
}
static int cypress_open (struct usb_serial_port *port, struct file *filp)
{
struct cypress_private *priv = usb_get_serial_port_data(port);
struct usb_serial *serial = port->serial;
unsigned long flags;
int result = 0;
dbg("%s - port %d", __FUNCTION__, port->number);
if (!priv->comm_is_ok)
return -EIO;
/* clear halts before open */
usb_clear_halt(serial->dev, 0x81);
usb_clear_halt(serial->dev, 0x02);
spin_lock_irqsave(&priv->lock, flags);
/* reset read/write statistics */
priv->bytes_in = 0;
priv->bytes_out = 0;
priv->cmd_count = 0;
priv->rx_flags = 0;
spin_unlock_irqrestore(&priv->lock, flags);
/* setting to zero could cause data loss */
port->tty->low_latency = 1;
/* raise both lines and set termios */
spin_lock_irqsave(&priv->lock, flags);
priv->line_control = CONTROL_DTR | CONTROL_RTS;
priv->cmd_ctrl = 1;
spin_unlock_irqrestore(&priv->lock, flags);
result = cypress_write(port, NULL, 0);
if (result) {
dev_err(&port->dev, "%s - failed setting the control lines - error %d\n", __FUNCTION__, result);
return result;
} else
dbg("%s - success setting the control lines", __FUNCTION__);
cypress_set_termios(port, &priv->tmp_termios);
/* setup the port and start reading from the device */
if(!port->interrupt_in_urb){
err("%s - interrupt_in_urb is empty!", __FUNCTION__);
return(-1);
}
usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
port->interrupt_in_urb->transfer_buffer, port->interrupt_in_urb->transfer_buffer_length,
cypress_read_int_callback, port, priv->read_urb_interval);
result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
if (result){
dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
cypress_set_dead(port);
}
return result;
} /* cypress_open */
static void cypress_close(struct usb_serial_port *port, struct file * filp)
{
struct cypress_private *priv = usb_get_serial_port_data(port);
unsigned int c_cflag;
unsigned long flags;
int bps;
long timeout;
wait_queue_t wait;
dbg("%s - port %d", __FUNCTION__, port->number);
/* wait for data to drain from buffer */
spin_lock_irqsave(&priv->lock, flags);
timeout = CYPRESS_CLOSING_WAIT;
init_waitqueue_entry(&wait, current);
add_wait_queue(&port->tty->write_wait, &wait);
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
if (cypress_buf_data_avail(priv->buf) == 0
|| timeout == 0 || signal_pending(current)
|| !usb_get_intfdata(port->serial->interface))
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 */
cypress_buf_clear(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
/* wait for characters to drain from device */
bps = tty_get_baud_rate(port->tty);
if (bps > 1200)
timeout = max((HZ*2560)/bps,HZ/10);
else
timeout = 2*HZ;
schedule_timeout_interruptible(timeout);
dbg("%s - stopping urbs", __FUNCTION__);
usb_kill_urb (port->interrupt_in_urb);
usb_kill_urb (port->interrupt_out_urb);
if (port->tty) {
c_cflag = port->tty->termios->c_cflag;
if (c_cflag & HUPCL) {
/* drop dtr and rts */
priv = usb_get_serial_port_data(port);
spin_lock_irqsave(&priv->lock, flags);
priv->line_control = 0;
priv->cmd_ctrl = 1;
spin_unlock_irqrestore(&priv->lock, flags);
cypress_write(port, NULL, 0);
}
}
if (stats)
dev_info (&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
priv->bytes_in, priv->bytes_out, priv->cmd_count);
} /* cypress_close */
static int cypress_write(struct usb_serial_port *port, const unsigned char *buf, int count)
{
struct cypress_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
/* line control commands, which need to be executed immediately,
are not put into the buffer for obvious reasons.
*/
if (priv->cmd_ctrl) {
count = 0;
goto finish;
}
if (!count)
return count;
spin_lock_irqsave(&priv->lock, flags);
count = cypress_buf_put(priv->buf, buf, count);
spin_unlock_irqrestore(&priv->lock, flags);
finish:
cypress_send(port);
return count;
} /* cypress_write */
static void cypress_send(struct usb_serial_port *port)
{
int count = 0, result, offset, actual_size;
struct cypress_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
if (!priv->comm_is_ok)
return;
dbg("%s - port %d", __FUNCTION__, port->number);
dbg("%s - interrupt out size is %d", __FUNCTION__, port->interrupt_out_size);
spin_lock_irqsave(&priv->lock, flags);
if (priv->write_urb_in_use) {
dbg("%s - can't write, urb in use", __FUNCTION__);
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
spin_unlock_irqrestore(&priv->lock, flags);
/* clear buffer */
memset(port->interrupt_out_urb->transfer_buffer, 0, port->interrupt_out_size);
spin_lock_irqsave(&priv->lock, flags);
switch (port->interrupt_out_size) {
case 32:
/* this is for the CY7C64013... */
offset = 2;
port->interrupt_out_buffer[0] = priv->line_control;
break;
case 8:
/* this is for the CY7C63743... */
offset = 1;
port->interrupt_out_buffer[0] = priv->line_control;
break;
default:
dbg("%s - wrong packet size", __FUNCTION__);
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
if (priv->line_control & CONTROL_RESET)
priv->line_control &= ~CONTROL_RESET;
if (priv->cmd_ctrl) {
priv->cmd_count++;
dbg("%s - line control command being issued", __FUNCTION__);
spin_unlock_irqrestore(&priv->lock, flags);
goto send;
} else
spin_unlock_irqrestore(&priv->lock, flags);
count = cypress_buf_get(priv->buf, &port->interrupt_out_buffer[offset],
port->interrupt_out_size-offset);
if (count == 0) {
return;
}
switch (port->interrupt_out_size) {
case 32:
port->interrupt_out_buffer[1] = count;
break;
case 8:
port->interrupt_out_buffer[0] |= count;
}
dbg("%s - count is %d", __FUNCTION__, count);
send:
spin_lock_irqsave(&priv->lock, flags);
priv->write_urb_in_use = 1;
spin_unlock_irqrestore(&priv->lock, flags);
if (priv->cmd_ctrl)
actual_size = 1;
else
actual_size = count + (port->interrupt_out_size == 32 ? 2 : 1);
usb_serial_debug_data(debug, &port->dev, __FUNCTION__, port->interrupt_out_size,
port->interrupt_out_urb->transfer_buffer);
usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
port->interrupt_out_buffer, port->interrupt_out_size,
cypress_write_int_callback, port, priv->write_urb_interval);
result = usb_submit_urb (port->interrupt_out_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;
cypress_set_dead(port);
}
spin_lock_irqsave(&priv->lock, flags);
if (priv->cmd_ctrl) {
priv->cmd_ctrl = 0;
}
priv->bytes_out += count; /* do not count the line control and size bytes */
spin_unlock_irqrestore(&priv->lock, flags);
usb_serial_port_softint(port);
} /* cypress_send */
/* returns how much space is available in the soft buffer */
static int cypress_write_room(struct usb_serial_port *port)
{
struct cypress_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 = cypress_buf_space_avail(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
dbg("%s - returns %d", __FUNCTION__, room);
return room;
}
static int cypress_tiocmget (struct usb_serial_port *port, struct file *file)
{
struct cypress_private *priv = usb_get_serial_port_data(port);
__u8 status, control;
unsigned int result = 0;
unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
spin_lock_irqsave(&priv->lock, flags);
control = priv->line_control;
status = priv->current_status;
spin_unlock_irqrestore(&priv->lock, flags);
result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
| ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
| ((status & UART_CTS) ? TIOCM_CTS : 0)
| ((status & UART_DSR) ? TIOCM_DSR : 0)
| ((status & UART_RI) ? TIOCM_RI : 0)
| ((status & UART_CD) ? TIOCM_CD : 0);
dbg("%s - result = %x", __FUNCTION__, result);
return result;
}
static int cypress_tiocmset (struct usb_serial_port *port, struct file *file,
unsigned int set, unsigned int clear)
{
struct cypress_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 (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;
spin_unlock_irqrestore(&priv->lock, flags);
priv->cmd_ctrl = 1;
return cypress_write(port, NULL, 0);
}
static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
{
struct cypress_private *priv = usb_get_serial_port_data(port);
dbg("%s - port %d, cmd 0x%.4x", __FUNCTION__, port->number, cmd);
switch (cmd) {
case TIOCGSERIAL:
if (copy_to_user((void __user *)arg, port->tty->termios, sizeof(struct termios))) {
return -EFAULT;
}
return (0);
break;
case TIOCSSERIAL:
if (copy_from_user(port->tty->termios, (void __user *)arg, sizeof(struct termios))) {
return -EFAULT;
}
/* here we need to call cypress_set_termios to invoke the new settings */
cypress_set_termios(port, &priv->tmp_termios);
return (0);
break;
/* these are called when setting baud rate from gpsd */
case TCGETS:
if (copy_to_user((void __user *)arg, port->tty->termios, sizeof(struct termios))) {
return -EFAULT;
}
return (0);
break;
case TCSETS:
if (copy_from_user(port->tty->termios, (void __user *)arg, sizeof(struct termios))) {
return -EFAULT;
}
/* here we need to call cypress_set_termios to invoke the new settings */
cypress_set_termios(port, &priv->tmp_termios);
return (0);
break;
/* This code comes from drivers/char/serial.c and ftdi_sio.c */
case TIOCMIWAIT:
while (priv != NULL) {
interruptible_sleep_on(&priv->delta_msr_wait);
/* see if a signal did it */
if (signal_pending(current))
return -ERESTARTSYS;
else {
char diff = priv->diff_status;
if (diff == 0) {
return -EIO; /* no change => error */
}
/* consume all events */
priv->diff_status = 0;
/* return 0 if caller wanted to know about these bits */
if ( ((arg & TIOCM_RNG) && (diff & UART_RI)) ||
((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
((arg & TIOCM_CD) && (diff & UART_CD)) ||
((arg & TIOCM_CTS) && (diff & UART_CTS)) ) {
return 0;
}
/* otherwise caller can't care less about what happened,
* and so we continue to wait for more events.
*/
}
}
return 0;
break;
default:
break;
}
dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __FUNCTION__, cmd);
return -ENOIOCTLCMD;
} /* cypress_ioctl */
static void cypress_set_termios (struct usb_serial_port *port,
struct termios *old_termios)
{
struct cypress_private *priv = usb_get_serial_port_data(port);
struct tty_struct *tty;
int data_bits, stop_bits, parity_type, parity_enable;
unsigned cflag, iflag, baud_mask;
unsigned long flags;
__u8 oldlines;
int linechange = 0;
dbg("%s - port %d", __FUNCTION__, port->number);
tty = port->tty;
if ((!tty) || (!tty->termios)) {
dbg("%s - no tty structures", __FUNCTION__);
return;
}
spin_lock_irqsave(&priv->lock, flags);
if (!priv->termios_initialized) {
if (priv->chiptype == CT_EARTHMATE) {
*(tty->termios) = tty_std_termios;
tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
CLOCAL;
} else if (priv->chiptype == CT_CYPHIDCOM) {
*(tty->termios) = tty_std_termios;
tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
CLOCAL;
} else if (priv->chiptype == CT_CA42V2) {
*(tty->termios) = tty_std_termios;
tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
CLOCAL;
}
priv->termios_initialized = 1;
}
spin_unlock_irqrestore(&priv->lock, flags);
cflag = tty->termios->c_cflag;
iflag = tty->termios->c_iflag;
/* check if there are new settings */
if (old_termios) {
if ((cflag != old_termios->c_cflag) ||
(RELEVANT_IFLAG(iflag) !=
RELEVANT_IFLAG(old_termios->c_iflag))) {
dbg("%s - attempting to set new termios settings",
__FUNCTION__);
/* should make a copy of this in case something goes
* wrong in the function, we can restore it */
spin_lock_irqsave(&priv->lock, flags);
priv->tmp_termios = *(tty->termios);
spin_unlock_irqrestore(&priv->lock, flags);
} else {
dbg("%s - nothing to do, exiting", __FUNCTION__);
return;
}
} else
return;
/* set number of data bits, parity, stop bits */
/* when parity is disabled the parity type bit is ignored */
/* 1 means 2 stop bits, 0 means 1 stop bit */
stop_bits = cflag & CSTOPB ? 1 : 0;
if (cflag & PARENB) {
parity_enable = 1;
/* 1 means odd parity, 0 means even parity */
parity_type = cflag & PARODD ? 1 : 0;
} else
parity_enable = parity_type = 0;
if (cflag & CSIZE) {
switch (cflag & CSIZE) {
case CS5:
data_bits = 0;
break;
case CS6:
data_bits = 1;
break;
case CS7:
data_bits = 2;
break;
case CS8:
data_bits = 3;
break;
default:
err("%s - CSIZE was set, but not CS5-CS8",
__FUNCTION__);
data_bits = 3;
}
} else
data_bits = 3;
spin_lock_irqsave(&priv->lock, flags);
oldlines = priv->line_control;
if ((cflag & CBAUD) == B0) {
/* drop dtr and rts */
dbg("%s - dropping the lines, baud rate 0bps", __FUNCTION__);
baud_mask = B0;
priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
} else {
baud_mask = (cflag & CBAUD);
switch(baud_mask) {
case B300:
dbg("%s - setting baud 300bps", __FUNCTION__);
break;
case B600:
dbg("%s - setting baud 600bps", __FUNCTION__);
break;
case B1200:
dbg("%s - setting baud 1200bps", __FUNCTION__);
break;
case B2400:
dbg("%s - setting baud 2400bps", __FUNCTION__);
break;
case B4800:
dbg("%s - setting baud 4800bps", __FUNCTION__);
break;
case B9600:
dbg("%s - setting baud 9600bps", __FUNCTION__);
break;
case B19200:
dbg("%s - setting baud 19200bps", __FUNCTION__);
break;
case B38400:
dbg("%s - setting baud 38400bps", __FUNCTION__);
break;
case B57600:
dbg("%s - setting baud 57600bps", __FUNCTION__);
break;
case B115200:
dbg("%s - setting baud 115200bps", __FUNCTION__);
break;
default:
dbg("%s - unknown masked baud rate", __FUNCTION__);
}
priv->line_control = (CONTROL_DTR | CONTROL_RTS);
}
spin_unlock_irqrestore(&priv->lock, flags);
dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
"%d data_bits (+5)", __FUNCTION__, stop_bits,
parity_enable, parity_type, data_bits);
cypress_serial_control(port, baud_mask, data_bits, stop_bits,
parity_enable, parity_type, 0, CYPRESS_SET_CONFIG);
/* we perform a CYPRESS_GET_CONFIG so that the current settings are
* filled into the private structure this should confirm that all is
* working if it returns what we just set */
cypress_serial_control(port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
/* Here we can define custom tty settings for devices; the main tty
* termios flag base comes from empeg.c */
spin_lock_irqsave(&priv->lock, flags);
if ( (priv->chiptype == CT_EARTHMATE) && (priv->baud_rate == 4800) ) {
dbg("Using custom termios settings for a baud rate of "
"4800bps.");
/* define custom termios settings for NMEA protocol */
tty->termios->c_iflag /* input modes - */
&= ~(IGNBRK /* disable ignore break */
| BRKINT /* disable break causes interrupt */
| PARMRK /* disable mark parity errors */
| ISTRIP /* disable clear high bit of input char */
| INLCR /* disable translate NL to CR */
| IGNCR /* disable ignore CR */
| ICRNL /* disable translate CR to NL */
| IXON); /* disable enable XON/XOFF flow control */
tty->termios->c_oflag /* output modes */
&= ~OPOST; /* disable postprocess output char */
tty->termios->c_lflag /* line discipline modes */
&= ~(ECHO /* disable echo input characters */
| ECHONL /* disable echo new line */
| ICANON /* disable erase, kill, werase, and rprnt
special characters */
| ISIG /* disable interrupt, quit, and suspend
special characters */
| IEXTEN); /* disable non-POSIX special characters */
} /* CT_CYPHIDCOM: Application should handle this for device */
linechange = (priv->line_control != oldlines);
spin_unlock_irqrestore(&priv->lock, flags);
/* if necessary, set lines */
if (linechange) {
priv->cmd_ctrl = 1;
cypress_write(port, NULL, 0);
}
} /* cypress_set_termios */
/* returns amount of data still left in soft buffer */
static int cypress_chars_in_buffer(struct usb_serial_port *port)
{
struct cypress_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 = cypress_buf_data_avail(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
dbg("%s - returns %d", __FUNCTION__, chars);
return chars;
}
static void cypress_throttle (struct usb_serial_port *port)
{
struct cypress_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
spin_lock_irqsave(&priv->lock, flags);
priv->rx_flags = THROTTLED;
spin_unlock_irqrestore(&priv->lock, flags);
}
static void cypress_unthrottle (struct usb_serial_port *port)
{
struct cypress_private *priv = usb_get_serial_port_data(port);
int actually_throttled, result;
unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
spin_lock_irqsave(&priv->lock, flags);
actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
priv->rx_flags = 0;
spin_unlock_irqrestore(&priv->lock, flags);
if (!priv->comm_is_ok)
return;
if (actually_throttled) {
port->interrupt_in_urb->dev = port->serial->dev;
result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
if (result) {
dev_err(&port->dev, "%s - failed submitting read urb, "
"error %d\n", __FUNCTION__, result);
cypress_set_dead(port);
}
}
}
static void cypress_read_int_callback(struct urb *urb)
{
struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
struct cypress_private *priv = usb_get_serial_port_data(port);
struct tty_struct *tty;
unsigned char *data = urb->transfer_buffer;
unsigned long flags;
char tty_flag = TTY_NORMAL;
int havedata = 0;
int bytes = 0;
int result;
int i = 0;
dbg("%s - port %d", __FUNCTION__, port->number);
switch (urb->status) {
case 0: /* success */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* precursor to disconnect so just go away */
return;
case -EPIPE:
usb_clear_halt(port->serial->dev,0x81);
break;
default:
/* something ugly is going on... */
dev_err(&urb->dev->dev,"%s - unexpected nonzero read status received: %d\n",
__FUNCTION__,urb->status);
cypress_set_dead(port);
return;
}
spin_lock_irqsave(&priv->lock, flags);
if (priv->rx_flags & THROTTLED) {
dbg("%s - now throttling", __FUNCTION__);
priv->rx_flags |= ACTUALLY_THROTTLED;
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
spin_unlock_irqrestore(&priv->lock, flags);
tty = port->tty;
if (!tty) {
dbg("%s - bad tty pointer - exiting", __FUNCTION__);
return;
}
spin_lock_irqsave(&priv->lock, flags);
switch(urb->actual_length) {
case 32:
/* This is for the CY7C64013... */
priv->current_status = data[0] & 0xF8;
bytes = data[1] + 2;
i = 2;
if (bytes > 2)
havedata = 1;
break;
case 8:
/* This is for the CY7C63743... */
priv->current_status = data[0] & 0xF8;
bytes = (data[0] & 0x07) + 1;
i = 1;
if (bytes > 1)
havedata = 1;
break;
default:
dbg("%s - wrong packet size - received %d bytes",
__FUNCTION__, urb->actual_length);
spin_unlock_irqrestore(&priv->lock, flags);
goto continue_read;
}
spin_unlock_irqrestore(&priv->lock, flags);
usb_serial_debug_data (debug, &port->dev, __FUNCTION__,
urb->actual_length, data);
spin_lock_irqsave(&priv->lock, flags);
/* check to see if status has changed */
if (priv != NULL) {
if (priv->current_status != priv->prev_status) {
priv->diff_status |= priv->current_status ^
priv->prev_status;
wake_up_interruptible(&priv->delta_msr_wait);
priv->prev_status = priv->current_status;
}
}
spin_unlock_irqrestore(&priv->lock, flags);
/* hangup, as defined in acm.c... this might be a bad place for it
* though */
if (tty && !(tty->termios->c_cflag & CLOCAL) &&
!(priv->current_status & UART_CD)) {
dbg("%s - calling hangup", __FUNCTION__);
tty_hangup(tty);
goto continue_read;
}
/* There is one error bit... I'm assuming it is a parity error
* indicator as the generic firmware will set this bit to 1 if a
* parity error occurs.
* I can not find reference to any other error events. */
spin_lock_irqsave(&priv->lock, flags);
if (priv->current_status & CYP_ERROR) {
spin_unlock_irqrestore(&priv->lock, flags);
tty_flag = TTY_PARITY;
dbg("%s - Parity Error detected", __FUNCTION__);
} else
spin_unlock_irqrestore(&priv->lock, flags);
/* process read if there is data other than line status */
if (tty && (bytes > i)) {
bytes = tty_buffer_request_room(tty, bytes);
for (; i < bytes ; ++i) {
dbg("pushing byte number %d - %d - %c", i, data[i],
data[i]);
tty_insert_flip_char(tty, data[i], tty_flag);
}
tty_flip_buffer_push(port->tty);
}
spin_lock_irqsave(&priv->lock, flags);
/* control and status byte(s) are also counted */
priv->bytes_in += bytes;
spin_unlock_irqrestore(&priv->lock, flags);
continue_read:
/* Continue trying to always read... unless the port has closed. */
if (port->open_count > 0 && priv->comm_is_ok) {
usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
usb_rcvintpipe(port->serial->dev,
port->interrupt_in_endpointAddress),
port->interrupt_in_urb->transfer_buffer,
port->interrupt_in_urb->transfer_buffer_length,
cypress_read_int_callback, port, priv->read_urb_interval);
result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
if (result) {
dev_err(&urb->dev->dev, "%s - failed resubmitting "
"read urb, error %d\n", __FUNCTION__,
result);
cypress_set_dead(port);
}
}
return;
} /* cypress_read_int_callback */
static void cypress_write_int_callback(struct urb *urb)
{
struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
struct cypress_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;
case -EPIPE: /* no break needed; clear halt and resubmit */
if (!priv->comm_is_ok)
break;
usb_clear_halt(port->serial->dev, 0x02);
/* error in the urb, so we have to resubmit it */
dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
port->interrupt_out_urb->transfer_buffer_length = 1;
port->interrupt_out_urb->dev = port->serial->dev;
result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
if (!result)
return;
dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n",
__FUNCTION__, result);
cypress_set_dead(port);
break;
default:
dev_err(&urb->dev->dev,"%s - unexpected nonzero write status received: %d\n",
__FUNCTION__,urb->status);
cypress_set_dead(port);
break;
}
priv->write_urb_in_use = 0;
/* send any buffered data */
cypress_send(port);
}
/*****************************************************************************
* Write buffer functions - buffering code from pl2303 used
*****************************************************************************/
/*
* cypress_buf_alloc
*
* Allocate a circular buffer and all associated memory.
*/
static struct cypress_buf *cypress_buf_alloc(unsigned int size)
{
struct cypress_buf *cb;
if (size == 0)
return NULL;
cb = (struct cypress_buf *)kmalloc(sizeof(struct cypress_buf), GFP_KERNEL);
if (cb == NULL)
return NULL;
cb->buf_buf = kmalloc(size, GFP_KERNEL);
if (cb->buf_buf == NULL) {
kfree(cb);
return NULL;
}
cb->buf_size = size;
cb->buf_get = cb->buf_put = cb->buf_buf;
return cb;
}
/*
* cypress_buf_free
*
* Free the buffer and all associated memory.
*/
static void cypress_buf_free(struct cypress_buf *cb)
{
if (cb) {
kfree(cb->buf_buf);
kfree(cb);
}
}
/*
* cypress_buf_clear
*
* Clear out all data in the circular buffer.
*/
static void cypress_buf_clear(struct cypress_buf *cb)
{
if (cb != NULL)
cb->buf_get = cb->buf_put;
/* equivalent to a get of all data available */
}
/*
* cypress_buf_data_avail
*
* Return the number of bytes of data available in the circular
* buffer.
*/
static unsigned int cypress_buf_data_avail(struct cypress_buf *cb)
{
if (cb != NULL)
return ((cb->buf_size + cb->buf_put - cb->buf_get) % cb->buf_size);
else
return 0;
}
/*
* cypress_buf_space_avail
*
* Return the number of bytes of space available in the circular
* buffer.
*/
static unsigned int cypress_buf_space_avail(struct cypress_buf *cb)
{
if (cb != NULL)
return ((cb->buf_size + cb->buf_get - cb->buf_put - 1) % cb->buf_size);
else
return 0;
}
/*
* cypress_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 cypress_buf_put(struct cypress_buf *cb, const char *buf,
unsigned int count)
{
unsigned int len;
if (cb == NULL)
return 0;
len = cypress_buf_space_avail(cb);
if (count > len)
count = len;
if (count == 0)
return 0;
len = cb->buf_buf + cb->buf_size - cb->buf_put;
if (count > len) {
memcpy(cb->buf_put, buf, len);
memcpy(cb->buf_buf, buf+len, count - len);
cb->buf_put = cb->buf_buf + count - len;
} else {
memcpy(cb->buf_put, buf, count);
if (count < len)
cb->buf_put += count;
else /* count == len */
cb->buf_put = cb->buf_buf;
}
return count;
}
/*
* cypress_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 cypress_buf_get(struct cypress_buf *cb, char *buf,
unsigned int count)
{
unsigned int len;
if (cb == NULL)
return 0;
len = cypress_buf_data_avail(cb);
if (count > len)
count = len;
if (count == 0)
return 0;
len = cb->buf_buf + cb->buf_size - cb->buf_get;
if (count > len) {
memcpy(buf, cb->buf_get, len);
memcpy(buf+len, cb->buf_buf, count - len);
cb->buf_get = cb->buf_buf + count - len;
} else {
memcpy(buf, cb->buf_get, count);
if (count < len)
cb->buf_get += count;
else /* count == len */
cb->buf_get = cb->buf_buf;
}
return count;
}
/*****************************************************************************
* Module functions
*****************************************************************************/
static int __init cypress_init(void)
{
int retval;
dbg("%s", __FUNCTION__);
retval = usb_serial_register(&cypress_earthmate_device);
if (retval)
goto failed_em_register;
retval = usb_serial_register(&cypress_hidcom_device);
if (retval)
goto failed_hidcom_register;
retval = usb_serial_register(&cypress_ca42v2_device);
if (retval)
goto failed_ca42v2_register;
retval = usb_register(&cypress_driver);
if (retval)
goto failed_usb_register;
info(DRIVER_DESC " " DRIVER_VERSION);
return 0;
failed_usb_register:
usb_deregister(&cypress_driver);
failed_ca42v2_register:
usb_serial_deregister(&cypress_ca42v2_device);
failed_hidcom_register:
usb_serial_deregister(&cypress_hidcom_device);
failed_em_register:
usb_serial_deregister(&cypress_earthmate_device);
return retval;
}
static void __exit cypress_exit (void)
{
dbg("%s", __FUNCTION__);
usb_deregister (&cypress_driver);
usb_serial_deregister (&cypress_earthmate_device);
usb_serial_deregister (&cypress_hidcom_device);
usb_serial_deregister (&cypress_ca42v2_device);
}
module_init(cypress_init);
module_exit(cypress_exit);
MODULE_AUTHOR( DRIVER_AUTHOR );
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");
module_param(stats, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(stats, "Enable statistics or not");
module_param(interval, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(interval, "Overrides interrupt interval");
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