400 lines
11 KiB
C
400 lines
11 KiB
C
/*
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Some of this code is credited to Linux USB open source files that are
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distributed with Linux.
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Copyright: 2007 Metrologic Instruments. All rights reserved.
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Copyright: 2011 Azimut Ltd. <http://azimutrzn.ru/>
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*/
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#include <linux/kernel.h>
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#include <linux/tty.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/moduleparam.h>
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#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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#include <linux/usb/serial.h>
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#define DRIVER_DESC "Metrologic Instruments Inc. - USB-POS driver"
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/* Product information. */
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#define FOCUS_VENDOR_ID 0x0C2E
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#define FOCUS_PRODUCT_ID_BI 0x0720
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#define FOCUS_PRODUCT_ID_UNI 0x0700
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#define METROUSB_SET_REQUEST_TYPE 0x40
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#define METROUSB_SET_MODEM_CTRL_REQUEST 10
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#define METROUSB_SET_BREAK_REQUEST 0x40
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#define METROUSB_MCR_NONE 0x08 /* Deactivate DTR and RTS. */
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#define METROUSB_MCR_RTS 0x0a /* Activate RTS. */
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#define METROUSB_MCR_DTR 0x09 /* Activate DTR. */
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#define WDR_TIMEOUT 5000 /* default urb timeout. */
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/* Private data structure. */
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struct metrousb_private {
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spinlock_t lock;
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int throttled;
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unsigned long control_state;
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};
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/* Device table list. */
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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_BI) },
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{ USB_DEVICE(FOCUS_VENDOR_ID, FOCUS_PRODUCT_ID_UNI) },
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{ }, /* Terminating entry. */
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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/* UNI-Directional mode commands for device configure */
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#define UNI_CMD_OPEN 0x80
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#define UNI_CMD_CLOSE 0xFF
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static inline int metrousb_is_unidirectional_mode(struct usb_serial_port *port)
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{
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__u16 product_id = le16_to_cpu(
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port->serial->dev->descriptor.idProduct);
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return product_id == FOCUS_PRODUCT_ID_UNI;
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}
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static int metrousb_send_unidirectional_cmd(u8 cmd, struct usb_serial_port *port)
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{
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int ret;
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int actual_len;
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u8 *buffer_cmd = NULL;
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if (!metrousb_is_unidirectional_mode(port))
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return 0;
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buffer_cmd = kzalloc(sizeof(cmd), GFP_KERNEL);
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if (!buffer_cmd)
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return -ENOMEM;
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*buffer_cmd = cmd;
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ret = usb_interrupt_msg(port->serial->dev,
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usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
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buffer_cmd, sizeof(cmd),
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&actual_len, USB_CTRL_SET_TIMEOUT);
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kfree(buffer_cmd);
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if (ret < 0)
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return ret;
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else if (actual_len != sizeof(cmd))
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return -EIO;
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return 0;
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}
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static void metrousb_read_int_callback(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
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unsigned char *data = urb->transfer_buffer;
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int throttled = 0;
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int result = 0;
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unsigned long flags = 0;
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dev_dbg(&port->dev, "%s\n", __func__);
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switch (urb->status) {
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case 0:
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/* Success status, read from the port. */
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break;
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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/* urb has been terminated. */
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dev_dbg(&port->dev,
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"%s - urb shutting down, error code=%d\n",
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__func__, urb->status);
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return;
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default:
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dev_dbg(&port->dev,
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"%s - non-zero urb received, error code=%d\n",
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__func__, urb->status);
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goto exit;
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}
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/* Set the data read from the usb port into the serial port buffer. */
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if (urb->actual_length) {
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/* Loop through the data copying each byte to the tty layer. */
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tty_insert_flip_string(&port->port, data, urb->actual_length);
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/* Force the data to the tty layer. */
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tty_flip_buffer_push(&port->port);
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}
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/* Set any port variables. */
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spin_lock_irqsave(&metro_priv->lock, flags);
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throttled = metro_priv->throttled;
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spin_unlock_irqrestore(&metro_priv->lock, flags);
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/* Continue trying to read if set. */
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if (!throttled) {
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usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
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usb_rcvintpipe(port->serial->dev, port->interrupt_in_endpointAddress),
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port->interrupt_in_urb->transfer_buffer,
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port->interrupt_in_urb->transfer_buffer_length,
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metrousb_read_int_callback, port, 1);
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result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
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if (result)
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dev_err(&port->dev,
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"%s - failed submitting interrupt in urb, error code=%d\n",
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__func__, result);
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}
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return;
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exit:
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/* Try to resubmit the urb. */
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result = usb_submit_urb(urb, GFP_ATOMIC);
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if (result)
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dev_err(&port->dev,
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"%s - failed submitting interrupt in urb, error code=%d\n",
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__func__, result);
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}
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static void metrousb_write_int_callback(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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dev_warn(&port->dev, "%s not implemented yet.\n",
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__func__);
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}
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static void metrousb_cleanup(struct usb_serial_port *port)
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{
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dev_dbg(&port->dev, "%s\n", __func__);
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usb_unlink_urb(port->interrupt_in_urb);
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usb_kill_urb(port->interrupt_in_urb);
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metrousb_send_unidirectional_cmd(UNI_CMD_CLOSE, port);
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}
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static int metrousb_open(struct tty_struct *tty, struct usb_serial_port *port)
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{
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struct usb_serial *serial = port->serial;
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struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
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unsigned long flags = 0;
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int result = 0;
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dev_dbg(&port->dev, "%s\n", __func__);
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/* Make sure the urb is initialized. */
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if (!port->interrupt_in_urb) {
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dev_err(&port->dev, "%s - interrupt urb not initialized\n",
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__func__);
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return -ENODEV;
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}
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/* Set the private data information for the port. */
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spin_lock_irqsave(&metro_priv->lock, flags);
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metro_priv->control_state = 0;
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metro_priv->throttled = 0;
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spin_unlock_irqrestore(&metro_priv->lock, flags);
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/* Clear the urb pipe. */
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usb_clear_halt(serial->dev, port->interrupt_in_urb->pipe);
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/* Start reading from the device */
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usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
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usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
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port->interrupt_in_urb->transfer_buffer,
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port->interrupt_in_urb->transfer_buffer_length,
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metrousb_read_int_callback, port, 1);
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result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
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if (result) {
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dev_err(&port->dev,
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"%s - failed submitting interrupt in urb, error code=%d\n",
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__func__, result);
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goto exit;
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}
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/* Send activate cmd to device */
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result = metrousb_send_unidirectional_cmd(UNI_CMD_OPEN, port);
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if (result) {
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dev_err(&port->dev,
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"%s - failed to configure device, error code=%d\n",
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__func__, result);
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goto exit;
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}
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dev_dbg(&port->dev, "%s - port open\n", __func__);
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exit:
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return result;
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}
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static int metrousb_set_modem_ctrl(struct usb_serial *serial, unsigned int control_state)
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{
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int retval = 0;
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unsigned char mcr = METROUSB_MCR_NONE;
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dev_dbg(&serial->dev->dev, "%s - control state = %d\n",
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__func__, control_state);
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/* Set the modem control value. */
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if (control_state & TIOCM_DTR)
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mcr |= METROUSB_MCR_DTR;
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if (control_state & TIOCM_RTS)
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mcr |= METROUSB_MCR_RTS;
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/* Send the command to the usb port. */
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retval = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
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METROUSB_SET_REQUEST_TYPE, METROUSB_SET_MODEM_CTRL_REQUEST,
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control_state, 0, NULL, 0, WDR_TIMEOUT);
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if (retval < 0)
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dev_err(&serial->dev->dev,
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"%s - set modem ctrl=0x%x failed, error code=%d\n",
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__func__, mcr, retval);
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return retval;
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}
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static int metrousb_port_probe(struct usb_serial_port *port)
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{
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struct metrousb_private *metro_priv;
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metro_priv = kzalloc(sizeof(*metro_priv), GFP_KERNEL);
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if (!metro_priv)
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return -ENOMEM;
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spin_lock_init(&metro_priv->lock);
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usb_set_serial_port_data(port, metro_priv);
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return 0;
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}
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static int metrousb_port_remove(struct usb_serial_port *port)
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{
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struct metrousb_private *metro_priv;
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metro_priv = usb_get_serial_port_data(port);
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kfree(metro_priv);
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return 0;
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}
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static void metrousb_throttle(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
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unsigned long flags = 0;
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dev_dbg(tty->dev, "%s\n", __func__);
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/* Set the private information for the port to stop reading data. */
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spin_lock_irqsave(&metro_priv->lock, flags);
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metro_priv->throttled = 1;
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spin_unlock_irqrestore(&metro_priv->lock, flags);
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}
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static int metrousb_tiocmget(struct tty_struct *tty)
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{
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unsigned long control_state = 0;
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struct usb_serial_port *port = tty->driver_data;
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struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
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unsigned long flags = 0;
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dev_dbg(tty->dev, "%s\n", __func__);
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spin_lock_irqsave(&metro_priv->lock, flags);
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control_state = metro_priv->control_state;
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spin_unlock_irqrestore(&metro_priv->lock, flags);
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return control_state;
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}
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static int metrousb_tiocmset(struct tty_struct *tty,
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unsigned int set, unsigned int clear)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct usb_serial *serial = port->serial;
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struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
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unsigned long flags = 0;
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unsigned long control_state = 0;
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dev_dbg(tty->dev, "%s - set=%d, clear=%d\n", __func__, set, clear);
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spin_lock_irqsave(&metro_priv->lock, flags);
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control_state = metro_priv->control_state;
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/* Set the RTS and DTR values. */
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if (set & TIOCM_RTS)
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control_state |= TIOCM_RTS;
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if (set & TIOCM_DTR)
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control_state |= TIOCM_DTR;
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if (clear & TIOCM_RTS)
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control_state &= ~TIOCM_RTS;
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if (clear & TIOCM_DTR)
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control_state &= ~TIOCM_DTR;
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metro_priv->control_state = control_state;
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spin_unlock_irqrestore(&metro_priv->lock, flags);
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return metrousb_set_modem_ctrl(serial, control_state);
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}
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static void metrousb_unthrottle(struct tty_struct *tty)
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{
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struct usb_serial_port *port = tty->driver_data;
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struct metrousb_private *metro_priv = usb_get_serial_port_data(port);
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unsigned long flags = 0;
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int result = 0;
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dev_dbg(tty->dev, "%s\n", __func__);
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/* Set the private information for the port to resume reading data. */
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spin_lock_irqsave(&metro_priv->lock, flags);
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metro_priv->throttled = 0;
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spin_unlock_irqrestore(&metro_priv->lock, flags);
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/* Submit the urb to read from the port. */
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port->interrupt_in_urb->dev = port->serial->dev;
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result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
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if (result)
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dev_err(tty->dev,
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"failed submitting interrupt in urb error code=%d\n",
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result);
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}
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static struct usb_serial_driver metrousb_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "metro-usb",
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},
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.description = "Metrologic USB to Serial",
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.id_table = id_table,
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.num_ports = 1,
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.open = metrousb_open,
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.close = metrousb_cleanup,
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.read_int_callback = metrousb_read_int_callback,
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.write_int_callback = metrousb_write_int_callback,
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.port_probe = metrousb_port_probe,
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.port_remove = metrousb_port_remove,
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.throttle = metrousb_throttle,
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.unthrottle = metrousb_unthrottle,
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.tiocmget = metrousb_tiocmget,
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.tiocmset = metrousb_tiocmset,
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};
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static struct usb_serial_driver * const serial_drivers[] = {
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&metrousb_device,
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NULL,
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};
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module_usb_serial_driver(serial_drivers, id_table);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Philip Nicastro");
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MODULE_AUTHOR("Aleksey Babahin <tamerlan311@gmail.com>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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