mirror of https://gitee.com/openkylin/linux.git
158 lines
3.7 KiB
C
158 lines
3.7 KiB
C
/*
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* Navman Serial USB driver
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*
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* Copyright (C) 2006 Greg Kroah-Hartman <gregkh@suse.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include "usb-serial.h"
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static int debug;
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static struct usb_device_id id_table [] = {
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{ USB_DEVICE(0x0a99, 0x0001) }, /* Talon Technology device */
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{ },
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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static struct usb_driver navman_driver = {
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.name = "navman",
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.probe = usb_serial_probe,
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.disconnect = usb_serial_disconnect,
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.id_table = id_table,
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.no_dynamic_id = 1,
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};
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static void navman_read_int_callback(struct urb *urb, struct pt_regs *regs)
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{
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struct usb_serial_port *port = urb->context;
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unsigned char *data = urb->transfer_buffer;
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struct tty_struct *tty;
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int result;
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switch (urb->status) {
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case 0:
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/* success */
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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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/* this urb is terminated, clean up */
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dbg("%s - urb shutting down with status: %d",
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__FUNCTION__, urb->status);
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return;
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default:
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dbg("%s - nonzero urb status received: %d",
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__FUNCTION__, urb->status);
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goto exit;
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}
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usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
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urb->actual_length, data);
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tty = port->tty;
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if (tty && urb->actual_length) {
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tty_buffer_request_room(tty, urb->actual_length);
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tty_insert_flip_string(tty, data, urb->actual_length);
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tty_flip_buffer_push(tty);
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}
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exit:
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result = usb_submit_urb(urb, GFP_ATOMIC);
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if (result)
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dev_err(&urb->dev->dev,
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"%s - Error %d submitting interrupt urb\n",
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__FUNCTION__, result);
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}
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static int navman_open(struct usb_serial_port *port, struct file *filp)
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{
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int result = 0;
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dbg("%s - port %d", __FUNCTION__, port->number);
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if (port->interrupt_in_urb) {
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dbg("%s - adding interrupt input for treo", __FUNCTION__);
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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 urb, error %d\n",
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__FUNCTION__, result);
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}
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return result;
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}
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static void navman_close(struct usb_serial_port *port, struct file *filp)
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{
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dbg("%s - port %d", __FUNCTION__, port->number);
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if (port->interrupt_in_urb)
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usb_kill_urb(port->interrupt_in_urb);
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}
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static int navman_write(struct usb_serial_port *port,
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const unsigned char *buf, int count)
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{
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dbg("%s - port %d", __FUNCTION__, port->number);
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/*
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* This device can't write any data, only read from the device
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* so we just silently eat all data sent to us and say it was
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* successfully sent.
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* Evil, I know, but do you have a better idea?
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*/
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return count;
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}
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static struct usb_serial_driver navman_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "navman",
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},
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.id_table = id_table,
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.num_interrupt_in = NUM_DONT_CARE,
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.num_bulk_in = NUM_DONT_CARE,
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.num_bulk_out = NUM_DONT_CARE,
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.num_ports = 1,
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.open = navman_open,
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.close = navman_close,
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.write = navman_write,
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.read_int_callback = navman_read_int_callback,
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};
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static int __init navman_init(void)
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{
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int retval;
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retval = usb_serial_register(&navman_device);
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if (retval)
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return retval;
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retval = usb_register(&navman_driver);
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if (retval)
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usb_serial_deregister(&navman_device);
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return retval;
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}
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static void __exit navman_exit(void)
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{
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usb_deregister(&navman_driver);
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usb_serial_deregister(&navman_device);
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}
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module_init(navman_init);
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module_exit(navman_exit);
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MODULE_LICENSE("GPL");
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module_param(debug, bool, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug, "Debug enabled or not");
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