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linux/drivers/usb/serial/cypress_m8.c

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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 <linux/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) },
{ USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
{ } /* 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_POWERCOM, PRODUCT_ID_UPS) },
{ 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,
};
enum packet_format {
packet_format_1, /* b0:status, b1:payload count */
packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */
};
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 */
enum packet_format pkt_fmt; /* format to use for packet send / receive */
int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */
int baud_rate; /* stores current baud rate in
integer 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 ktermios 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 tty_struct *tty,
struct usb_serial_port *port, struct file *filp);
static void cypress_close(struct tty_struct *tty,
struct usb_serial_port *port, struct file *filp);
static int cypress_write(struct tty_struct *tty, 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 tty_struct *tty);
static int cypress_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg);
static void cypress_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old);
static int cypress_tiocmget(struct tty_struct *tty, struct file *file);
static int cypress_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear);
static int cypress_chars_in_buffer(struct tty_struct *tty);
static void cypress_throttle(struct tty_struct *tty);
static void cypress_unthrottle(struct tty_struct *tty);
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);
/* 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",
.usb_driver = &cypress_driver,
.id_table = id_table_earthmate,
.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",
.usb_driver = &cypress_driver,
.id_table = id_table_cyphidcomrs232,
.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",
.usb_driver = &cypress_driver,
.id_table = id_table_nokiaca42v2,
.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
*****************************************************************************/
static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
{
struct cypress_private *priv;
priv = usb_get_serial_port_data(port);
/*
* 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 (port->serial->dev->speed == USB_SPEED_LOW) {
/*
* Mike Isely <isely@pobox.com> 2-Feb-2008: The
* Cypress app note that describes this mechanism
* states the the low-speed part can't handle more
* than 800 bytes/sec, in which case 4800 baud is the
* safest speed for a part like that.
*/
if (new_rate > 4800) {
dbg("%s - failed setting baud rate, device incapable "
"speed %d", __func__, new_rate);
return -1;
}
}
switch (priv->chiptype) {
case CT_EARTHMATE:
if (new_rate <= 600) {
/* 300 and 600 baud rates are supported under
* the generic firmware, but are not used with
* NMEA and SiRF protocols */
dbg("%s - failed setting baud rate, unsupported speed "
"of %d on Earthmate GPS", __func__, new_rate);
return -1;
}
break;
default:
break;
}
return new_rate;
}
/* This function can either set or retrieve the current serial line settings */
static int cypress_serial_control(struct tty_struct *tty,
struct usb_serial_port *port, speed_t baud_rate, 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[5];
unsigned long flags;
dbg("%s", __func__);
priv = usb_get_serial_port_data(port);
if (!priv->comm_is_ok)
return -ENODEV;
switch (cypress_request_type) {
case CYPRESS_SET_CONFIG:
new_baudrate = priv->baud_rate;
/* 0 means 'Hang up' so doesn't change the true bit rate */
if (baud_rate == 0)
new_baudrate = priv->baud_rate;
/* Change of speed ? */
else if (baud_rate != priv->baud_rate) {
dbg("%s - baud rate is changing", __func__);
retval = analyze_baud_rate(port, baud_rate);
if (retval >= 0) {
new_baudrate = retval;
dbg("%s - New baud rate set to %d",
__func__, new_baudrate);
}
}
dbg("%s - baud rate is being sent as %d",
__func__, new_baudrate);
memset(feature_buffer, 0, sizeof(feature_buffer));
/* 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:",
__func__);
dbg("%s - %02X - %02X - %02X - %02X - %02X", __func__,
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,
sizeof(feature_buffer), 500);
if (tries++ >= 3)
break;
} while (retval != sizeof(feature_buffer) &&
retval != -ENODEV);
if (retval != sizeof(feature_buffer)) {
err("%s - failed sending serial line settings - %d",
__func__, retval);
cypress_set_dead(port);
} else {
spin_lock_irqsave(&priv->lock, flags);
priv->baud_rate = new_baudrate;
priv->current_config = feature_buffer[4];
spin_unlock_irqrestore(&priv->lock, flags);
/* If we asked for a speed change encode it */
if (baud_rate)
tty_encode_baud_rate(tty,
new_baudrate, new_baudrate);
}
break;
case CYPRESS_GET_CONFIG:
if (priv->get_cfg_unsafe) {
/* Not implemented for this device,
and if we try to do it we're likely
to crash the hardware. */
return -ENOTTY;
}
dbg("%s - retreiving serial line settings", __func__);
/* set initial values in feature buffer */
memset(feature_buffer, 0, sizeof(feature_buffer));
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,
sizeof(feature_buffer), 500);
if (tries++ >= 3)
break;
} while (retval != sizeof(feature_buffer)
&& retval != -ENODEV);
if (retval != sizeof(feature_buffer)) {
err("%s - failed to retrieve serial line settings - %d", __func__, 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);
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);
}
/*****************************************************************************
* 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", __func__, 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;
/* Default packet format setting is determined by packet size.
Anything with a size larger then 9 must have a separate
count field since the 3 bit count field is otherwise too
small. Otherwise we can use the slightly more compact
format. This is in accordance with the cypress_m8 serial
converter app note. */
if (port->interrupt_out_size > 9)
priv->pkt_fmt = packet_format_1;
else
priv->pkt_fmt = packet_format_2;
if (interval > 0) {
priv->write_urb_interval = interval;
priv->read_urb_interval = interval;
dbg("%s - port %d read & write intervals forced to %d",
__func__, 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",
__func__, 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;
struct usb_serial_port *port = serial->port[0];
dbg("%s", __func__);
if (generic_startup(serial)) {
dbg("%s - Failed setting up port %d", __func__,
port->number);
return 1;
}
priv = usb_get_serial_port_data(port);
priv->chiptype = CT_EARTHMATE;
/* All Earthmate devices use the separated-count packet
format! Idiotic. */
priv->pkt_fmt = packet_format_1;
if (serial->dev->descriptor.idProduct !=
cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
/* The old original USB Earthmate seemed able to
handle GET_CONFIG requests; everything they've
produced since that time crashes if this command is
attempted :-( */
dbg("%s - Marking this device as unsafe for GET_CONFIG "
"commands", __func__);
priv->get_cfg_unsafe = !0;
}
return 0;
} /* cypress_earthmate_startup */
static int cypress_hidcom_startup(struct usb_serial *serial)
{
struct cypress_private *priv;
dbg("%s", __func__);
if (generic_startup(serial)) {
dbg("%s - Failed setting up port %d", __func__,
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", __func__);
if (generic_startup(serial)) {
dbg("%s - Failed setting up port %d", __func__,
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", __func__, 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 tty_struct *tty,
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", __func__, 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 */
if (tty)
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(tty, port, NULL, 0);
if (result) {
dev_err(&port->dev,
"%s - failed setting the control lines - error %d\n",
__func__, result);
return result;
} else
dbg("%s - success setting the control lines", __func__);
if (tty)
cypress_set_termios(tty, 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!", __func__);
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",
__func__, result);
cypress_set_dead(port);
}
return result;
} /* cypress_open */
static void cypress_close(struct tty_struct *tty,
struct usb_serial_port *port, struct file *filp)
{
struct cypress_private *priv = usb_get_serial_port_data(port);
unsigned int c_cflag;
int bps;
long timeout;
wait_queue_t wait;
dbg("%s - port %d", __func__, port->number);
/* wait for data to drain from buffer */
spin_lock_irq(&priv->lock);
timeout = CYPRESS_CLOSING_WAIT;
init_waitqueue_entry(&wait, current);
add_wait_queue(&tty->write_wait, &wait);
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
if (cypress_buf_data_avail(priv->buf) == 0
|| timeout == 0 || signal_pending(current)
/* without mutex, allowed due to harmless failure mode */
|| port->serial->disconnected)
break;
spin_unlock_irq(&priv->lock);
timeout = schedule_timeout(timeout);
spin_lock_irq(&priv->lock);
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&tty->write_wait, &wait);
/* clear out any remaining data in the buffer */
cypress_buf_clear(priv->buf);
spin_unlock_irq(&priv->lock);
/* writing is potentially harmful, lock must be taken */
mutex_lock(&port->serial->disc_mutex);
if (port->serial->disconnected) {
mutex_unlock(&port->serial->disc_mutex);
return;
}
/* wait for characters to drain from device */
if (tty) {
bps = tty_get_baud_rate(tty);
if (bps > 1200)
timeout = max((HZ * 2560) / bps, HZ / 10);
else
timeout = 2 * HZ;
schedule_timeout_interruptible(timeout);
}
dbg("%s - stopping urbs", __func__);
usb_kill_urb(port->interrupt_in_urb);
usb_kill_urb(port->interrupt_out_urb);
if (tty) {
c_cflag = tty->termios->c_cflag;
if (c_cflag & HUPCL) {
/* drop dtr and rts */
priv = usb_get_serial_port_data(port);
spin_lock_irq(&priv->lock);
priv->line_control = 0;
priv->cmd_ctrl = 1;
spin_unlock_irq(&priv->lock);
cypress_write(tty, 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);
mutex_unlock(&port->serial->disc_mutex);
} /* cypress_close */
static int cypress_write(struct tty_struct *tty, 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", __func__, 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", __func__, port->number);
dbg("%s - interrupt out size is %d", __func__,
port->interrupt_out_size);
spin_lock_irqsave(&priv->lock, flags);
if (priv->write_urb_in_use) {
dbg("%s - can't write, urb in use", __func__);
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 (priv->pkt_fmt) {
default:
case packet_format_1:
/* this is for the CY7C64013... */
offset = 2;
port->interrupt_out_buffer[0] = priv->line_control;
break;
case packet_format_2:
/* this is for the CY7C63743... */
offset = 1;
port->interrupt_out_buffer[0] = priv->line_control;
break;
}
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", __func__);
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 (priv->pkt_fmt) {
default:
case packet_format_1:
port->interrupt_out_buffer[1] = count;
break;
case packet_format_2:
port->interrupt_out_buffer[0] |= count;
}
dbg("%s - count is %d", __func__, 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 +
(priv->pkt_fmt == packet_format_1 ? 2 : 1);
usb_serial_debug_data(debug, &port->dev, __func__,
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",
__func__, 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;
/* do not count the line control and size bytes */
priv->bytes_out += count;
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 tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct cypress_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 = cypress_buf_space_avail(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
dbg("%s - returns %d", __func__, room);
return room;
}
static int cypress_tiocmget(struct tty_struct *tty, struct file *file)
{
struct usb_serial_port *port = tty->driver_data;
struct cypress_private *priv = usb_get_serial_port_data(port);
__u8 status, control;
unsigned int result = 0;
unsigned long flags;
dbg("%s - port %d", __func__, 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", __func__, result);
return result;
}
static int cypress_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
struct usb_serial_port *port = tty->driver_data;
struct cypress_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
dbg("%s - port %d", __func__, 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;
priv->cmd_ctrl = 1;
spin_unlock_irqrestore(&priv->lock, flags);
return cypress_write(tty, port, NULL, 0);
}
static int cypress_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct usb_serial_port *port = tty->driver_data;
struct cypress_private *priv = usb_get_serial_port_data(port);
dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
switch (cmd) {
/* 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;
default:
break;
}
dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __func__, cmd);
return -ENOIOCTLCMD;
} /* cypress_ioctl */
static void cypress_set_termios(struct tty_struct *tty,
struct usb_serial_port *port, struct ktermios *old_termios)
{
struct cypress_private *priv = usb_get_serial_port_data(port);
int data_bits, stop_bits, parity_type, parity_enable;
unsigned cflag, iflag;
unsigned long flags;
__u8 oldlines;
int linechange = 0;
dbg("%s - port %d", __func__, port->number);
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;
tty->termios->c_ispeed = 4800;
tty->termios->c_ospeed = 4800;
} else if (priv->chiptype == CT_CYPHIDCOM) {
*(tty->termios) = tty_std_termios;
tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
CLOCAL;
tty->termios->c_ispeed = 9600;
tty->termios->c_ospeed = 9600;
} else if (priv->chiptype == CT_CA42V2) {
*(tty->termios) = tty_std_termios;
tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
CLOCAL;
tty->termios->c_ispeed = 9600;
tty->termios->c_ospeed = 9600;
}
priv->termios_initialized = 1;
}
spin_unlock_irqrestore(&priv->lock, flags);
/* Unsupported features need clearing */
tty->termios->c_cflag &= ~(CMSPAR|CRTSCTS);
cflag = tty->termios->c_cflag;
iflag = tty->termios->c_iflag;
/* check if there are new settings */
if (old_termios) {
spin_lock_irqsave(&priv->lock, flags);
priv->tmp_termios = *(tty->termios);
spin_unlock_irqrestore(&priv->lock, flags);
}
/* 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;
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",
__func__);
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", __func__);
priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
} else
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)", __func__, stop_bits,
parity_enable, parity_type, data_bits);
cypress_serial_control(tty, port, tty_get_baud_rate(tty),
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(tty, 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(tty, port, NULL, 0);
}
} /* cypress_set_termios */
/* returns amount of data still left in soft buffer */
static int cypress_chars_in_buffer(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct cypress_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 = cypress_buf_data_avail(priv->buf);
spin_unlock_irqrestore(&priv->lock, flags);
dbg("%s - returns %d", __func__, chars);
return chars;
}
static void cypress_throttle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct cypress_private *priv = usb_get_serial_port_data(port);
unsigned long flags;
dbg("%s - port %d", __func__, port->number);
spin_lock_irqsave(&priv->lock, flags);
priv->rx_flags = THROTTLED;
spin_unlock_irqrestore(&priv->lock, flags);
}
static void cypress_unthrottle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
struct cypress_private *priv = usb_get_serial_port_data(port);
int actually_throttled, result;
unsigned long flags;
dbg("%s - port %d", __func__, 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", __func__, result);
cypress_set_dead(port);
}
}
}
static void cypress_read_int_callback(struct urb *urb)
{
struct usb_serial_port *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;
int status = urb->status;
dbg("%s - port %d", __func__, port->number);
switch (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",
__func__, status);
cypress_set_dead(port);
return;
}
spin_lock_irqsave(&priv->lock, flags);
if (priv->rx_flags & THROTTLED) {
dbg("%s - now throttling", __func__);
priv->rx_flags |= ACTUALLY_THROTTLED;
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
spin_unlock_irqrestore(&priv->lock, flags);
tty = tty_port_tty_get(&port->port);
if (!tty) {
dbg("%s - bad tty pointer - exiting", __func__);
return;
}
spin_lock_irqsave(&priv->lock, flags);
result = urb->actual_length;
switch (priv->pkt_fmt) {
default:
case packet_format_1:
/* This is for the CY7C64013... */
priv->current_status = data[0] & 0xF8;
bytes = data[1] + 2;
i = 2;
if (bytes > 2)
havedata = 1;
break;
case packet_format_2:
/* This is for the CY7C63743... */
priv->current_status = data[0] & 0xF8;
bytes = (data[0] & 0x07) + 1;
i = 1;
if (bytes > 1)
havedata = 1;
break;
}
spin_unlock_irqrestore(&priv->lock, flags);
if (result < bytes) {
dbg("%s - wrong packet size - received %d bytes but packet "
"said %d bytes", __func__, result, bytes);
goto continue_read;
}
usb_serial_debug_data(debug, &port->dev, __func__,
urb->actual_length, data);
spin_lock_irqsave(&priv->lock, flags);
/* check to see if status has changed */
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", __func__);
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", __func__);
} 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(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:
tty_kref_put(tty);
/* Continue trying to always read... unless the port has closed. */
if (port->port.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", __func__,
result);
cypress_set_dead(port);
}
}
return;
} /* cypress_read_int_callback */
static void cypress_write_int_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct cypress_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;
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",
__func__, 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",
__func__, result);
cypress_set_dead(port);
break;
default:
dev_err(&urb->dev->dev,
"%s - unexpected nonzero write status received: %d\n",
__func__, 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 = 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", __func__);
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_serial_deregister(&cypress_ca42v2_device);
failed_ca42v2_register:
usb_serial_deregister(&cypress_hidcom_device);
failed_hidcom_register:
usb_serial_deregister(&cypress_earthmate_device);
failed_em_register:
return retval;
}
static void __exit cypress_exit(void)
{
dbg("%s", __func__);
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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