| /* |
| * 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_device_type usb_serial_generic_device = { |
| .owner = THIS_MODULE, |
| .name = "Generic", |
| .short_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, |
| }; |
| #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); |
| } |
| |
| 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]); |
| } |
| } |
| |