// SPDX-License-Identifier: GPL-2.0
/*
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/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/uaccess.h>
#include <linux/usb/serial.h>
#define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver"
/* Product information. */
#define FOCUS_VENDOR_ID 0x0C2E
#define FOCUS_PRODUCT_ID_BI 0x0720
#define FOCUS_PRODUCT_ID_UNI 0x0700
#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 const struct usb_device_id id_table[] = {
{ USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_BI) },
{ USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_UNI) },
{ USB_DEVICE_INTERFACE_CLASS(0x0c2e, 0x0730, 0xff) }, /* MS7820 */
{ }, /* Terminating entry. */
};
MODULE_DEVICE_TABLE(usb, id_table);
/* UNI-Directional mode commands for device configure */
#define UNI_CMD_OPEN 0x80
#define UNI_CMD_CLOSE 0xFF
static int metrousb_is_unidirectional_mode(struct usb_serial *serial)
{
u16 product_id = le16_to_cpu(serial->dev->descriptor.idProduct);
return product_id == FOCUS_PRODUCT_ID_UNI;
}
static int metrousb_calc_num_ports(struct usb_serial *serial,
struct usb_serial_endpoints *epds)
{
if (metrousb_is_unidirectional_mode(serial)) {
if (epds->num_interrupt_out == 0) {
dev_err(&serial->interface->dev, "interrupt-out endpoint missing\n");
return -ENODEV;
}
}
return 1;
}
static int metrousb_send_unidirectional_cmd(u8 cmd, struct usb_serial_port *port)
{
int ret;
int actual_len;
u8 *buffer_cmd = NULL;
if (!metrousb_is_unidirectional_mode(port->serial))
return 0;
buffer_cmd = kzalloc(sizeof(cmd), GFP_KERNEL);
if (!buffer_cmd)
return -ENOMEM;
*buffer_cmd = cmd;
ret = usb_interrupt_msg(port->serial->dev,
usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
buffer_cmd, sizeof(cmd),
&actual_len, USB_CTRL_SET_TIMEOUT);
kfree(buffer_cmd);
if (ret < 0)
return ret;
else if (actual_len != sizeof(cmd))
return -EIO;
return 0;
}
static void metrousb_read_int_callback(struct urb *urb)
{
struct usb_serial_port *port = urb->context;
struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
unsigned char *data = urb->transfer_buffer;
unsigned long flags;
int throttled = 0;
int result = 0;
dev_dbg(&port->dev, "%s\n", __func__);
switch (urb->status) {
case 0:
/* Success status, read from the port. */
break;
case -ECONNRESET:
case -ENOENT:
case -ESHUTDOWN:
/* urb has been terminated. */
dev_dbg(&port->dev,
"%s - urb shutting down, error code=%d\n",
__func__, urb->status);
return;
default:
dev_dbg(&port->dev,
"%s - non-zero urb received, error code=%d\n",
__func__, urb->status);
goto exit;
}
/* Set the data read from the usb port into the serial port buffer. */
if (urb->actual_length) {
/* Loop through the data copying each byte to the tty layer. */
tty_insert_flip_string(&port->port, data, urb->actual_length);
/* Force the data to the tty layer. */
tty_flip_buffer_push(&port->port);
}
/* Set any port variables. */
spin_lock_irqsave(&metro_priv->lock, flags);
throttled = metro_priv->throttled;
spin_unlock_irqrestore(&metro_priv->lock, flags);
if (throttled)
return;
exit:
/* Try to resubmit the urb. */
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result)
dev_err(&port->dev,
"%s - failed submitting interrupt in urb, error code=%d\n",
__func__, result);
}
static void metrousb_cleanup(struct usb_serial_port *port)
{
usb_kill_urb(port->interrupt_in_urb);
metrousb_send_unidirectional_cmd(UNI_CMD_CLOSE, port);
}
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;
int result = 0;
/* 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);
/* 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) {
dev_err(&port->dev,
"%s - failed submitting interrupt in urb, error code=%d\n",
__func__, result);
return result;
}
/* Send activate cmd to device */
result = metrousb_send_unidirectional_cmd(UNI_CMD_OPEN, port);
if (result) {
dev_err(&port->dev,
"%s - failed to configure device, error code=%d\n",
__func__, result);
goto err_kill_urb;
}
return 0;
err_kill_urb:
usb_kill_urb(port->interrupt_in_urb);
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;
dev_dbg(&serial->dev->dev, "%s - control state = %d\n",
__func__, 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)
dev_err(&serial->dev->dev,
"%s - set modem ctrl=0x%x failed, error code=%d\n",
__func__, mcr, retval);
return retval;
}
static int metrousb_port_probe(struct usb_serial_port *port)
{
struct metrousb_private *metro_priv;
metro_priv = kzalloc(sizeof(*metro_priv), GFP_KERNEL);
if (!metro_priv)
return -ENOMEM;
spin_lock_init(&metro_priv->lock);
usb_set_serial_port_data(port, metro_priv);
return 0;
}
static void metrousb_port_remove(struct usb_serial_port *port)
{
struct metrousb_private *metro_priv;
metro_priv = usb_get_serial_port_data(port);
kfree(metro_priv);
}
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;
/* 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;
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;
unsigned long control_state = 0;
dev_dbg(&port->dev, "%s - set=%d, clear=%d\n", __func__, 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;
int result = 0;
/* 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. */
result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
if (result)
dev_err(&port->dev,
"failed submitting interrupt in urb error code=%d\n",
result);
}
static struct usb_serial_driver metrousb_device = {
.driver = {
.name = "metro-usb",
},
.description = "Metrologic USB to Serial",
.id_table = id_table,
.num_interrupt_in = 1,
.calc_num_ports = metrousb_calc_num_ports,
.open = metrousb_open,
.close = metrousb_cleanup,
.read_int_callback = metrousb_read_int_callback,
.port_probe = metrousb_port_probe,
.port_remove = metrousb_port_remove,
.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(serial_drivers, id_table);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Philip Nicastro");
MODULE_AUTHOR("Aleksey Babahin <[email protected]>");
MODULE_DESCRIPTION(DRIVER_DESC);
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