| /* |
| Some of this code is credited to Linux USB open source files that are |
| distributed with Linux. |
| |
| Copyright: 2007 Metrologic Instruments. All rights reserved. |
| Copyright: 2011 Azimut Ltd. <http://azimutrzn.ru/> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/tty.h> |
| #include <linux/module.h> |
| #include <linux/usb.h> |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| #include <linux/tty_driver.h> |
| #include <linux/tty_flip.h> |
| #include <linux/moduleparam.h> |
| #include <linux/spinlock.h> |
| #include <linux/errno.h> |
| #include <linux/uaccess.h> |
| #include <linux/usb/serial.h> |
| |
| /* Version Information */ |
| #define DRIVER_VERSION "v1.2.0.0" |
| #define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver" |
| |
| /* Product information. */ |
| #define FOCUS_VENDOR_ID 0x0C2E |
| #define FOCUS_PRODUCT_ID 0x0720 |
| #define FOCUS_PRODUCT_ID_UNI 0x0710 |
| |
| #define METROUSB_SET_REQUEST_TYPE 0x40 |
| #define METROUSB_SET_MODEM_CTRL_REQUEST 10 |
| #define METROUSB_SET_BREAK_REQUEST 0x40 |
| #define METROUSB_MCR_NONE 0x08 /* Deactivate DTR and RTS. */ |
| #define METROUSB_MCR_RTS 0x0a /* Activate RTS. */ |
| #define METROUSB_MCR_DTR 0x09 /* Activate DTR. */ |
| #define WDR_TIMEOUT 5000 /* default urb timeout. */ |
| |
| /* Private data structure. */ |
| struct metrousb_private { |
| spinlock_t lock; |
| int throttled; |
| unsigned long control_state; |
| }; |
| |
| /* Device table list. */ |
| static struct usb_device_id id_table[] = { |
| { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID) }, |
| { USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_UNI) }, |
| { }, /* Terminating entry. */ |
| }; |
| MODULE_DEVICE_TABLE(usb, id_table); |
| |
| /* Input parameter constants. */ |
| static bool debug; |
| |
| static void metrousb_read_int_callback(struct urb *urb) |
| { |
| struct usb_serial_port *port = (struct usb_serial_port *)urb->context; |
| struct metrousb_private *metro_priv = usb_get_serial_port_data(port); |
| struct tty_struct *tty; |
| unsigned char *data = urb->transfer_buffer; |
| int throttled = 0; |
| int result = 0; |
| unsigned long flags = 0; |
| |
| dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number); |
| |
| switch (urb->status) { |
| case 0: |
| /* Success status, read from the port. */ |
| break; |
| case -ECONNRESET: |
| case -ENOENT: |
| case -ESHUTDOWN: |
| /* urb has been terminated. */ |
| dbg("METRO-USB - %s - urb shutting down, port number=%d, error code=%d", |
| __FUNCTION__, port->number, result); |
| return; |
| default: |
| dbg("METRO-USB - %s - non-zero urb received, port number=%d, error code=%d", |
| __FUNCTION__, port->number, result); |
| goto exit; |
| } |
| |
| |
| /* Set the data read from the usb port into the serial port buffer. */ |
| tty = tty_port_tty_get(&port->port); |
| if (!tty) { |
| dbg("%s - bad tty pointer - exiting", __func__); |
| return; |
| } |
| |
| if (tty && urb->actual_length) { |
| /* Loop through the data copying each byte to the tty layer. */ |
| tty_insert_flip_string(tty, data, urb->actual_length); |
| |
| /* Force the data to the tty layer. */ |
| tty_flip_buffer_push(tty); |
| } |
| tty_kref_put(tty); |
| |
| /* Set any port variables. */ |
| spin_lock_irqsave(&metro_priv->lock, flags); |
| throttled = metro_priv->throttled; |
| spin_unlock_irqrestore(&metro_priv->lock, flags); |
| |
| /* Continue trying to read if set. */ |
| if (!throttled) { |
| 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, |
| metrousb_read_int_callback, port, 1); |
| |
| result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); |
| |
| if (result) { |
| dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d", |
| __FUNCTION__, port->number, result); |
| } |
| } |
| return; |
| |
| exit: |
| /* Try to resubmit the urb. */ |
| result = usb_submit_urb(urb, GFP_ATOMIC); |
| if (result) { |
| dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d", |
| __FUNCTION__, port->number, result); |
| } |
| } |
| |
| static void metrousb_cleanup(struct usb_serial_port *port) |
| { |
| dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number); |
| |
| if (port->serial->dev) { |
| /* Shutdown any interrupt in urbs. */ |
| if (port->interrupt_in_urb) { |
| usb_unlink_urb(port->interrupt_in_urb); |
| usb_kill_urb(port->interrupt_in_urb); |
| } |
| } |
| } |
| |
| static int metrousb_open(struct tty_struct *tty, struct usb_serial_port *port) |
| { |
| struct usb_serial *serial = port->serial; |
| struct metrousb_private *metro_priv = usb_get_serial_port_data(port); |
| unsigned long flags = 0; |
| int result = 0; |
| |
| dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number); |
| |
| /* Make sure the urb is initialized. */ |
| if (!port->interrupt_in_urb) { |
| dbg("METRO-USB - %s - interrupt urb not initialized for port number=%d", __FUNCTION__, port->number); |
| return -ENODEV; |
| } |
| |
| /* Set the private data information for the port. */ |
| spin_lock_irqsave(&metro_priv->lock, flags); |
| metro_priv->control_state = 0; |
| metro_priv->throttled = 0; |
| spin_unlock_irqrestore(&metro_priv->lock, flags); |
| |
| /* |
| * Force low_latency on so that our tty_push actually forces the data |
| * through, otherwise it is scheduled, and with high data rates (like |
| * with OHCI) data can get lost. |
| */ |
| if (tty) |
| tty->low_latency = 1; |
| |
| /* Clear the urb pipe. */ |
| usb_clear_halt(serial->dev, port->interrupt_in_urb->pipe); |
| |
| /* Start reading from the device */ |
| 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, |
| metrousb_read_int_callback, port, 1); |
| result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); |
| |
| if (result) { |
| dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d" |
| , __FUNCTION__, port->number, result); |
| goto exit; |
| } |
| |
| dbg("METRO-USB - %s - port open for port number=%d", __FUNCTION__, port->number); |
| exit: |
| return result; |
| } |
| |
| static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int control_state) |
| { |
| int retval = 0; |
| unsigned char mcr = METROUSB_MCR_NONE; |
| |
| dbg("METRO-USB - %s - control state=%d", __FUNCTION__, control_state); |
| |
| /* Set the modem control value. */ |
| if (control_state & TIOCM_DTR) |
| mcr |= METROUSB_MCR_DTR; |
| if (control_state & TIOCM_RTS) |
| mcr |= METROUSB_MCR_RTS; |
| |
| /* Send the command to the usb port. */ |
| retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), |
| METROUSB_SET_REQUEST_TYPE, METROUSB_SET_MODEM_CTRL_REQUEST, |
| control_state, 0, NULL, 0, WDR_TIMEOUT); |
| if (retval < 0) |
| dbg("METRO-USB - %s - set modem ctrl=0x%x failed, error code=%d", __FUNCTION__, mcr, retval); |
| |
| return retval; |
| } |
| |
| static void metrousb_shutdown(struct usb_serial *serial) |
| { |
| int i = 0; |
| |
| dbg("METRO-USB - %s", __FUNCTION__); |
| |
| /* Stop reading and writing on all ports. */ |
| for (i = 0; i < serial->num_ports; ++i) { |
| /* Close any open urbs. */ |
| metrousb_cleanup(serial->port[i]); |
| |
| /* Free memory. */ |
| kfree(usb_get_serial_port_data(serial->port[i])); |
| usb_set_serial_port_data(serial->port[i], NULL); |
| |
| dbg("METRO-USB - %s - freed port number=%d", __FUNCTION__, serial->port[i]->number); |
| } |
| } |
| |
| static int metrousb_startup(struct usb_serial *serial) |
| { |
| struct metrousb_private *metro_priv; |
| struct usb_serial_port *port; |
| int i = 0; |
| |
| dbg("METRO-USB - %s", __FUNCTION__); |
| |
| /* Loop through the serial ports setting up the private structures. |
| * Currently we only use one port. */ |
| for (i = 0; i < serial->num_ports; ++i) { |
| port = serial->port[i]; |
| |
| /* Declare memory. */ |
| metro_priv = kmalloc(sizeof(struct metrousb_private), GFP_KERNEL); |
| if (!metro_priv) |
| return -ENOMEM; |
| |
| /* Clear memory. */ |
| memset(metro_priv, 0x00, sizeof(struct metrousb_private)); |
| |
| /* Initialize memory. */ |
| spin_lock_init(&metro_priv->lock); |
| usb_set_serial_port_data(port, metro_priv); |
| |
| dbg("METRO-USB - %s - port number=%d.", __FUNCTION__, port->number); |
| } |
| |
| return 0; |
| } |
| |
| static void metrousb_throttle(struct tty_struct *tty) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| struct metrousb_private *metro_priv = usb_get_serial_port_data(port); |
| unsigned long flags = 0; |
| |
| dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number); |
| |
| /* Set the private information for the port to stop reading data. */ |
| spin_lock_irqsave(&metro_priv->lock, flags); |
| metro_priv->throttled = 1; |
| spin_unlock_irqrestore(&metro_priv->lock, flags); |
| } |
| |
| static int metrousb_tiocmget(struct tty_struct *tty) |
| { |
| unsigned long control_state = 0; |
| struct usb_serial_port *port = tty->driver_data; |
| struct metrousb_private *metro_priv = usb_get_serial_port_data(port); |
| unsigned long flags = 0; |
| |
| dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number); |
| |
| spin_lock_irqsave(&metro_priv->lock, flags); |
| control_state = metro_priv->control_state; |
| spin_unlock_irqrestore(&metro_priv->lock, flags); |
| |
| return control_state; |
| } |
| |
| static int metrousb_tiocmset(struct tty_struct *tty, |
| unsigned int set, unsigned int clear) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| struct usb_serial *serial = port->serial; |
| struct metrousb_private *metro_priv = usb_get_serial_port_data(port); |
| unsigned long flags = 0; |
| unsigned long control_state = 0; |
| |
| dbg("METRO-USB - %s - port number=%d, set=%d, clear=%d", __FUNCTION__, port->number, set, clear); |
| |
| spin_lock_irqsave(&metro_priv->lock, flags); |
| control_state = metro_priv->control_state; |
| |
| /* Set the RTS and DTR values. */ |
| if (set & TIOCM_RTS) |
| control_state |= TIOCM_RTS; |
| if (set & TIOCM_DTR) |
| control_state |= TIOCM_DTR; |
| if (clear & TIOCM_RTS) |
| control_state &= ~TIOCM_RTS; |
| if (clear & TIOCM_DTR) |
| control_state &= ~TIOCM_DTR; |
| |
| metro_priv->control_state = control_state; |
| spin_unlock_irqrestore(&metro_priv->lock, flags); |
| return metrousb_set_modem_ctrl(serial, control_state); |
| } |
| |
| static void metrousb_unthrottle(struct tty_struct *tty) |
| { |
| struct usb_serial_port *port = tty->driver_data; |
| struct metrousb_private *metro_priv = usb_get_serial_port_data(port); |
| unsigned long flags = 0; |
| int result = 0; |
| |
| dbg("METRO-USB - %s - port number=%d", __FUNCTION__, port->number); |
| |
| /* Set the private information for the port to resume reading data. */ |
| spin_lock_irqsave(&metro_priv->lock, flags); |
| metro_priv->throttled = 0; |
| spin_unlock_irqrestore(&metro_priv->lock, flags); |
| |
| /* Submit the urb to read from the port. */ |
| port->interrupt_in_urb->dev = port->serial->dev; |
| result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); |
| if (result) { |
| dbg("METRO-USB - %s - failed submitting interrupt in urb for port number=%d, error code=%d", |
| __FUNCTION__, port->number, result); |
| } |
| } |
| |
| static struct usb_driver metrousb_driver = { |
| .name = "metro-usb", |
| .probe = usb_serial_probe, |
| .disconnect = usb_serial_disconnect, |
| .id_table = id_table |
| }; |
| |
| static struct usb_serial_driver metrousb_device = { |
| .driver = { |
| .owner = THIS_MODULE, |
| .name = "metro-usb", |
| }, |
| .description = "Metrologic USB to serial converter.", |
| .id_table = id_table, |
| .num_ports = 1, |
| .open = metrousb_open, |
| .close = metrousb_cleanup, |
| .read_int_callback = metrousb_read_int_callback, |
| .attach = metrousb_startup, |
| .release = metrousb_shutdown, |
| .throttle = metrousb_throttle, |
| .unthrottle = metrousb_unthrottle, |
| .tiocmget = metrousb_tiocmget, |
| .tiocmset = metrousb_tiocmset, |
| }; |
| |
| static struct usb_serial_driver * const serial_drivers[] = { |
| &metrousb_device, |
| NULL, |
| }; |
| |
| module_usb_serial_driver(metrousb_driver, serial_drivers); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Philip Nicastro"); |
| MODULE_AUTHOR("Aleksey Babahin <tamerlan311@gmail.com>"); |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| |
| /* Module input parameters */ |
| module_param(debug, bool, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(debug, "Print debug info (bool 1=on, 0=off)"); |