Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/usb/serial/cypress_m8.c b/drivers/usb/serial/cypress_m8.c
new file mode 100644
index 0000000..db8f472
--- /dev/null
+++ b/drivers/usb/serial/cypress_m8.c
@@ -0,0 +1,1538 @@
+/*
+ * 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>
+ * 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.
+ *
+ *
+ * Long Term TODO:
+ * Improve transfer speeds - both read/write are somewhat slow
+ * at this point.
+ * Improve debugging. Show modem line status with debug output and
+ * implement filtering for certain data as a module parameter.
+ */
+
+/* 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/config.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/spinlock.h>
+#include <linux/usb.h>
+#include <linux/serial.h>
+#include <linux/delay.h>
+#include <asm/uaccess.h>
+
+#include "usb-serial.h"
+#include "cypress_m8.h"
+
+
+#ifdef CONFIG_USB_SERIAL_DEBUG
+ static int debug = 1;
+#else
+ static int debug;
+#endif
+static int stats;
+
+/*
+ * Version Information
+ */
+#define DRIVER_VERSION "v1.08"
+#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) },
+ { } /* 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_combined [] = {
+ { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
+ { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
+ { } /* 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,
+};
+
+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 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 */
+ char calledfromopen; /* used when issuing lines on open - fixes rts drop bug */
+};
+
+/* 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 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_read_int_callback (struct urb *urb, struct pt_regs *regs);
+static void cypress_write_int_callback (struct urb *urb, struct pt_regs *regs);
+/* 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_device_type cypress_earthmate_device = {
+ .owner = THIS_MODULE,
+ .name = "DeLorme Earthmate USB",
+ .short_name = "earthmate",
+ .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_device_type cypress_hidcom_device = {
+ .owner = THIS_MODULE,
+ .name = "HID->COM RS232 Adapter",
+ .short_name = "cyphidcom",
+ .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,
+};
+
+
+/*****************************************************************************
+ * Cypress serial helper functions
+ *****************************************************************************/
+
+
+/* This function can either set or retreive 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 i, n_baud_rate = 0, retval = 0;
+ struct cypress_private *priv;
+ __u8 feature_buffer[5];
+ __u8 config;
+ unsigned long flags;
+
+ dbg("%s", __FUNCTION__);
+
+ priv = usb_get_serial_port_data(port);
+
+ 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.
+ */
+ 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 (default to 4800)",
+ __FUNCTION__);
+ n_baud_rate = 4800;
+ } else if ( (n_baud_rate = mask_to_rate(baud_mask)) == -1) {
+ err("%s - failed setting baud rate, unsupported speed (default to 4800)",
+ __FUNCTION__);
+ n_baud_rate = 4800;
+ }
+ } else if (priv->chiptype == CT_CYPHIDCOM) {
+ if ( (n_baud_rate = mask_to_rate(baud_mask)) == -1) {
+ err("%s - failed setting baud rate, unsupported speed (default to 4800)",
+ __FUNCTION__);
+ n_baud_rate = 4800;
+ }
+ } else if (priv->chiptype == CT_GENERIC) {
+ if ( (n_baud_rate = mask_to_rate(baud_mask)) == -1) {
+ err("%s - failed setting baud rate, unsupported speed (default to 4800)",
+ __FUNCTION__);
+ n_baud_rate = 4800;
+ }
+ } else {
+ info("%s - please define your chiptype, using 4800bps default", __FUNCTION__);
+ n_baud_rate = 4800;
+ }
+ } else { /* baud rate not changing, keep the old */
+ n_baud_rate = priv->baud_rate;
+ }
+ dbg("%s - baud rate is being sent as %d", __FUNCTION__, n_baud_rate);
+
+
+ /*
+ * This algorithm accredited to Jiang Jay Zhang... thanks for all the help!
+ */
+ for (i = 0; i < 4; ++i) {
+ feature_buffer[i] = ( n_baud_rate >> (i*8) & 0xFF );
+ }
+
+ config = 0; // reset config byte
+ config |= data_bits; // assign data bits in 2 bit space ( max 3 )
+ /* 1 bit gap */
+ config |= (stop_bits << 3); // assign stop bits in 1 bit space
+ config |= (parity_enable << 4); // assign parity flag in 1 bit space
+ config |= (parity_type << 5); // assign parity type in 1 bit space
+ /* 1 bit gap */
+ config |= (reset << 7); // assign reset at end of byte, 1 bit space
+
+ feature_buffer[4] = config;
+
+ 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]);
+
+ 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, 5, 500);
+
+ if (retval != 5)
+ err("%s - failed sending serial line settings - %d", __FUNCTION__, retval);
+ else {
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->baud_rate = n_baud_rate;
+ priv->cbr_mask = baud_mask;
+ priv->current_config = config;
+ ++priv->cmd_count;
+ spin_unlock_irqrestore(&priv->lock, flags);
+ }
+ break;
+ case CYPRESS_GET_CONFIG:
+ dbg("%s - retreiving serial line settings", __FUNCTION__);
+ /* reset values in feature buffer */
+ memset(feature_buffer, 0, 5);
+
+ 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, 5, 500);
+ if (retval != 5) {
+ err("%s - failed to retreive serial line settings - %d", __FUNCTION__, retval);
+ 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];
+ /* reverse the process above to get the baud_mask value */
+ n_baud_rate = 0; // reset bits
+ for (i = 0; i < 4; ++i) {
+ n_baud_rate |= ( feature_buffer[i] << (i*8) );
+ }
+
+ priv->baud_rate = n_baud_rate;
+ if ( (priv->cbr_mask = rate_to_mask(n_baud_rate)) == 0x40)
+ dbg("%s - failed setting the baud mask (not defined)", __FUNCTION__);
+ ++priv->cmd_count;
+ spin_unlock_irqrestore(&priv->lock, flags);
+ }
+ break;
+ default:
+ err("%s - unsupported serial control command issued", __FUNCTION__);
+ }
+ return retval;
+} /* cypress_serial_control */
+
+
+/* given a baud mask, it will return speed 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;
+
+ dbg("%s - port %d", __FUNCTION__, serial->port[0]->number);
+
+ priv = kmalloc(sizeof (struct cypress_private), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ memset(priv, 0x00, sizeof (struct cypress_private));
+ 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->calledfromopen = 0;
+ priv->rx_flags = 0;
+ usb_set_serial_port_data(serial->port[0], 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 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);
+
+ /* clear halts before open */
+ usb_clear_halt(serial->dev, 0x00);
+ 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->calledfromopen = 1;
+ 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, port->interrupt_in_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);
+ }
+
+ 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;
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(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;
+
+ 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);
+
+ port->interrupt_out_urb->transfer_buffer_length = actual_size;
+ port->interrupt_out_urb->dev = port->serial->dev;
+ 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;
+ }
+
+ 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);
+
+ schedule_work(&port->work);
+} /* 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;
+
+ 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;
+ }
+ 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 */
+
+ stop_bits = cflag & CSTOPB ? 1 : 0; /* 1 means 2 stop bits, 0 means 1 stop bit */
+
+ if (cflag & PARENB) {
+ parity_enable = 1;
+ parity_type = cflag & PARODD ? 1 : 0; /* 1 means odd parity, 0 means even parity */
+ } 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;
+
+ /* toggle CRTSCTS? - don't do this if being called from cypress_open */
+ if (!priv->calledfromopen) {
+ if (cflag & CRTSCTS)
+ priv->line_control |= CONTROL_RTS;
+ else
+ priv->line_control &= ~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);
+
+ msleep(50); /* give some time between change and read (50ms) */
+
+ /* 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 characters */
+ | 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 characters */
+
+ 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 */
+
+ } else if (priv->chiptype == CT_CYPHIDCOM) {
+
+ // Software app handling it for device...
+
+ }
+ linechange = (priv->line_control != oldlines);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ /* if necessary, set lines */
+ if (!priv->calledfromopen && linechange) {
+ priv->cmd_ctrl = 1;
+ cypress_write(port, NULL, 0);
+ }
+
+ if (priv->calledfromopen)
+ priv->calledfromopen = 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 (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);
+ }
+}
+
+
+static void cypress_read_int_callback(struct urb *urb, struct pt_regs *regs)
+{
+ 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);
+
+ if (urb->status) {
+ dbg("%s - nonzero read status received: %d", __FUNCTION__, urb->status);
+ 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)) {
+ for (; i < bytes ; ++i) {
+ dbg("pushing byte number %d - %d - %c",i,data[i],data[i]);
+ if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
+ tty_flip_buffer_push(tty);
+ }
+ tty_insert_flip_char(tty, data[i], tty_flag);
+ }
+ tty_flip_buffer_push(port->tty);
+ }
+
+ spin_lock_irqsave(&priv->lock, flags);
+ priv->bytes_in += bytes; /* control and status byte(s) are also counted */
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+continue_read:
+
+ /* Continue trying to always read... unless the port has closed. */
+
+ if (port->open_count > 0) {
+ 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,
+ port->interrupt_in_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);
+ }
+
+ return;
+} /* cypress_read_int_callback */
+
+
+static void cypress_write_int_callback(struct urb *urb, struct pt_regs *regs)
+{
+ 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;
+ default:
+ /* error in the urb, so we have to resubmit it */
+ dbg("%s - Overflow in write", __FUNCTION__);
+ dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
+ port->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)
+ dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n",
+ __FUNCTION__, result);
+ else
+ return;
+ }
+
+ priv->write_urb_in_use = 0;
+
+ /* send any buffered data */
+ 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 != NULL) {
+ if (cb->buf_buf != NULL)
+ 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_register(&cypress_driver);
+ if (retval)
+ goto failed_usb_register;
+
+ info(DRIVER_DESC " " DRIVER_VERSION);
+ return 0;
+failed_usb_register:
+ usb_deregister(&cypress_driver);
+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);
+}
+
+
+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");