/* * USB Serial Converter Generic functions * * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version * 2 as published by the Free Software Foundation. * */ #include <linux/config.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/slab.h> #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/usb.h> #include <asm/uaccess.h> #include "usb-serial.h" static int debug; #ifdef CONFIG_USB_SERIAL_GENERIC static __u16 vendor = 0x05f9; static __u16 product = 0xffff; module_param(vendor, ushort, 0); MODULE_PARM_DESC(vendor, "User specified USB idVendor"); module_param(product, ushort, 0); MODULE_PARM_DESC(product, "User specified USB idProduct"); static struct usb_device_id generic_device_ids[2]; /* Initially all zeroes. */ /* All of the device info needed for the Generic Serial Converter */ struct usb_serial_driver usb_serial_generic_device = { .driver = { .owner = THIS_MODULE, .name = "generic", }, .id_table = generic_device_ids, .num_interrupt_in = NUM_DONT_CARE, .num_bulk_in = NUM_DONT_CARE, .num_bulk_out = NUM_DONT_CARE, .num_ports = 1, .shutdown = usb_serial_generic_shutdown, }; /* we want to look at all devices, as the vendor/product id can change * depending on the command line argument */ static struct usb_device_id generic_serial_ids[] = { {.driver_info = 42}, {} }; static int generic_probe(struct usb_interface *interface, const struct usb_device_id *id) { const struct usb_device_id *id_pattern; id_pattern = usb_match_id(interface, generic_device_ids); if (id_pattern != NULL) return usb_serial_probe(interface, id); return -ENODEV; } static struct usb_driver generic_driver = { .owner = THIS_MODULE, .name = "usbserial_generic", .probe = generic_probe, .disconnect = usb_serial_disconnect, .id_table = generic_serial_ids, .no_dynamic_id = 1, }; #endif int usb_serial_generic_register (int _debug) { int retval = 0; debug = _debug; #ifdef CONFIG_USB_SERIAL_GENERIC generic_device_ids[0].idVendor = vendor; generic_device_ids[0].idProduct = product; generic_device_ids[0].match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT; /* register our generic driver with ourselves */ retval = usb_serial_register (&usb_serial_generic_device); if (retval) goto exit; retval = usb_register(&generic_driver); if (retval) usb_serial_deregister(&usb_serial_generic_device); exit: #endif return retval; } void usb_serial_generic_deregister (void) { #ifdef CONFIG_USB_SERIAL_GENERIC /* remove our generic driver */ usb_deregister(&generic_driver); usb_serial_deregister (&usb_serial_generic_device); #endif } int usb_serial_generic_open (struct usb_serial_port *port, struct file *filp) { struct usb_serial *serial = port->serial; int result = 0; dbg("%s - port %d", __FUNCTION__, port->number); /* 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 (port->tty) port->tty->low_latency = 1; /* if we have a bulk interrupt, start reading from it */ if (serial->num_bulk_in) { /* Start reading from the device */ usb_fill_bulk_urb (port->read_urb, serial->dev, usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress), port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length, ((serial->type->read_bulk_callback) ? serial->type->read_bulk_callback : usb_serial_generic_read_bulk_callback), port); result = usb_submit_urb(port->read_urb, GFP_KERNEL); if (result) dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); } return result; } static void generic_cleanup (struct usb_serial_port *port) { struct usb_serial *serial = port->serial; dbg("%s - port %d", __FUNCTION__, port->number); if (serial->dev) { /* shutdown any bulk reads that might be going on */ if (serial->num_bulk_out) usb_kill_urb(port->write_urb); if (serial->num_bulk_in) usb_kill_urb(port->read_urb); } } void usb_serial_generic_close (struct usb_serial_port *port, struct file * filp) { dbg("%s - port %d", __FUNCTION__, port->number); generic_cleanup (port); } int usb_serial_generic_write(struct usb_serial_port *port, const unsigned char *buf, int count) { struct usb_serial *serial = port->serial; int result; unsigned char *data; dbg("%s - port %d", __FUNCTION__, port->number); if (count == 0) { dbg("%s - write request of 0 bytes", __FUNCTION__); return (0); } /* only do something if we have a bulk out endpoint */ if (serial->num_bulk_out) { spin_lock(&port->lock); if (port->write_urb_busy) { spin_unlock(&port->lock); dbg("%s - already writing", __FUNCTION__); return 0; } port->write_urb_busy = 1; spin_unlock(&port->lock); count = (count > port->bulk_out_size) ? port->bulk_out_size : count; memcpy (port->write_urb->transfer_buffer, buf, count); data = port->write_urb->transfer_buffer; usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, data); /* set up our urb */ usb_fill_bulk_urb (port->write_urb, serial->dev, usb_sndbulkpipe (serial->dev, port->bulk_out_endpointAddress), port->write_urb->transfer_buffer, count, ((serial->type->write_bulk_callback) ? serial->type->write_bulk_callback : usb_serial_generic_write_bulk_callback), port); /* send the data out the bulk port */ port->write_urb_busy = 1; result = usb_submit_urb(port->write_urb, GFP_ATOMIC); if (result) { dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result); /* don't have to grab the lock here, as we will retry if != 0 */ port->write_urb_busy = 0; } else result = count; return result; } /* no bulk out, so return 0 bytes written */ return 0; } int usb_serial_generic_write_room (struct usb_serial_port *port) { struct usb_serial *serial = port->serial; int room = 0; dbg("%s - port %d", __FUNCTION__, port->number); if (serial->num_bulk_out) { if (!(port->write_urb_busy)) room = port->bulk_out_size; } dbg("%s - returns %d", __FUNCTION__, room); return (room); } int usb_serial_generic_chars_in_buffer (struct usb_serial_port *port) { struct usb_serial *serial = port->serial; int chars = 0; dbg("%s - port %d", __FUNCTION__, port->number); if (serial->num_bulk_out) { if (port->write_urb_busy) chars = port->write_urb->transfer_buffer_length; } dbg("%s - returns %d", __FUNCTION__, chars); return (chars); } void usb_serial_generic_read_bulk_callback (struct urb *urb, struct pt_regs *regs) { struct usb_serial_port *port = (struct usb_serial_port *)urb->context; struct usb_serial *serial = port->serial; struct tty_struct *tty; unsigned char *data = urb->transfer_buffer; int i; int result; dbg("%s - port %d", __FUNCTION__, port->number); if (urb->status) { dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status); return; } usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data); tty = port->tty; if (tty && urb->actual_length) { for (i = 0; i < urb->actual_length ; ++i) { /* if we insert more than TTY_FLIPBUF_SIZE characters, we drop them. */ if(tty->flip.count >= TTY_FLIPBUF_SIZE) { tty_flip_buffer_push(tty); } /* this doesn't actually push the data through unless tty->low_latency is set */ tty_insert_flip_char(tty, data[i], 0); } tty_flip_buffer_push(tty); } /* Continue trying to always read */ usb_fill_bulk_urb (port->read_urb, serial->dev, usb_rcvbulkpipe (serial->dev, port->bulk_in_endpointAddress), port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length, ((serial->type->read_bulk_callback) ? serial->type->read_bulk_callback : usb_serial_generic_read_bulk_callback), port); result = usb_submit_urb(port->read_urb, GFP_ATOMIC); if (result) dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result); } void usb_serial_generic_write_bulk_callback (struct urb *urb, struct pt_regs *regs) { struct usb_serial_port *port = (struct usb_serial_port *)urb->context; dbg("%s - port %d", __FUNCTION__, port->number); port->write_urb_busy = 0; if (urb->status) { dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status); return; } usb_serial_port_softint((void *)port); schedule_work(&port->work); } EXPORT_SYMBOL_GPL(usb_serial_generic_write_bulk_callback); void usb_serial_generic_shutdown (struct usb_serial *serial) { int i; dbg("%s", __FUNCTION__); /* stop reads and writes on all ports */ for (i=0; i < serial->num_ports; ++i) { generic_cleanup(serial->port[i]); } }