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/*
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* Native support for the I/O-Warrior USB devices
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*
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* Copyright (c) 2003-2005 Code Mercenaries GmbH
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* written by Christian Lucht <lucht@codemercs.com>
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*
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* based on
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* usb-skeleton.c by Greg Kroah-Hartman <greg@kroah.com>
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* brlvger.c by Stephane Dalton <sdalton@videotron.ca>
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* and St<EFBFBD>hane Doyon <s.doyon@videotron.ca>
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*
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* Released under the GPLv2.
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*/
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/mutex.h>
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#include <linux/poll.h>
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#include <linux/usb/iowarrior.h>
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/* Version Information */
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#define DRIVER_VERSION "v0.4.0"
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#define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>"
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#define DRIVER_DESC "USB IO-Warrior driver (Linux 2.6.x)"
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#define USB_VENDOR_ID_CODEMERCS 1984
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/* low speed iowarrior */
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#define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500
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#define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501
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#define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511
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#define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512
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/* full speed iowarrior */
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#define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503
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/* Get a minor range for your devices from the usb maintainer */
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#ifdef CONFIG_USB_DYNAMIC_MINORS
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#define IOWARRIOR_MINOR_BASE 0
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#else
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#define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not official yet
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#endif
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/* interrupt input queue size */
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#define MAX_INTERRUPT_BUFFER 16
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/*
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maximum number of urbs that are submitted for writes at the same time,
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this applies to the IOWarrior56 only!
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IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls.
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*/
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#define MAX_WRITES_IN_FLIGHT 4
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/* Use our own dbg macro */
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#undef dbg
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#define dbg( format, arg... ) do { if( debug ) printk( KERN_DEBUG __FILE__ ": " format "\n" , ## arg ); } while ( 0 )
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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/* Module parameters */
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static DEFINE_MUTEX(iowarrior_mutex);
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static bool debug = 0;
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module_param(debug, bool, 0644);
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MODULE_PARM_DESC(debug, "debug=1 enables debugging messages");
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static struct usb_driver iowarrior_driver;
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static DEFINE_MUTEX(iowarrior_open_disc_lock);
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/*--------------*/
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/* data */
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/*--------------*/
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/* Structure to hold all of our device specific stuff */
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struct iowarrior {
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struct mutex mutex; /* locks this structure */
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struct usb_device *udev; /* save off the usb device pointer */
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struct usb_interface *interface; /* the interface for this device */
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unsigned char minor; /* the starting minor number for this device */
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struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */
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struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */
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struct urb *int_in_urb; /* the urb for reading data */
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unsigned char *int_in_buffer; /* buffer for data to be read */
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unsigned char serial_number; /* to detect lost packages */
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unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */
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wait_queue_head_t read_wait;
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wait_queue_head_t write_wait; /* wait-queue for writing to the device */
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atomic_t write_busy; /* number of write-urbs submitted */
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atomic_t read_idx;
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atomic_t intr_idx;
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spinlock_t intr_idx_lock; /* protects intr_idx */
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atomic_t overflow_flag; /* signals an index 'rollover' */
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int present; /* this is 1 as long as the device is connected */
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int opened; /* this is 1 if the device is currently open */
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char chip_serial[9]; /* the serial number string of the chip connected */
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int report_size; /* number of bytes in a report */
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u16 product_id;
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};
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/*--------------*/
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/* globals */
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/*--------------*/
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/*
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* USB spec identifies 5 second timeouts.
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*/
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#define GET_TIMEOUT 5
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#define USB_REQ_GET_REPORT 0x01
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//#if 0
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static int usb_get_report(struct usb_device *dev,
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struct usb_host_interface *inter, unsigned char type,
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unsigned char id, void *buf, int size)
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{
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return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
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USB_REQ_GET_REPORT,
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USB_DIR_IN | USB_TYPE_CLASS |
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USB_RECIP_INTERFACE, (type << 8) + id,
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inter->desc.bInterfaceNumber, buf, size,
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GET_TIMEOUT*HZ);
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}
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//#endif
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#define USB_REQ_SET_REPORT 0x09
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static int usb_set_report(struct usb_interface *intf, unsigned char type,
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unsigned char id, void *buf, int size)
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{
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return usb_control_msg(interface_to_usbdev(intf),
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usb_sndctrlpipe(interface_to_usbdev(intf), 0),
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USB_REQ_SET_REPORT,
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USB_TYPE_CLASS | USB_RECIP_INTERFACE,
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(type << 8) + id,
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intf->cur_altsetting->desc.bInterfaceNumber, buf,
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size, HZ);
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}
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/*---------------------*/
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/* driver registration */
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/*---------------------*/
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/* table of devices that work with this driver */
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static const struct usb_device_id iowarrior_ids[] = {
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{USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)},
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{USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)},
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{USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)},
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{USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)},
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{USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)},
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{} /* Terminating entry */
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};
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MODULE_DEVICE_TABLE(usb, iowarrior_ids);
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/*
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* USB callback handler for reading data
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*/
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static void iowarrior_callback(struct urb *urb)
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{
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struct iowarrior *dev = urb->context;
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int intr_idx;
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int read_idx;
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int aux_idx;
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int offset;
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int status = urb->status;
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int retval;
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switch (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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return;
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default:
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goto exit;
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}
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spin_lock(&dev->intr_idx_lock);
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intr_idx = atomic_read(&dev->intr_idx);
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/* aux_idx become previous intr_idx */
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aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1);
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read_idx = atomic_read(&dev->read_idx);
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/* queue is not empty and it's interface 0 */
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if ((intr_idx != read_idx)
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&& (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) {
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/* + 1 for serial number */
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offset = aux_idx * (dev->report_size + 1);
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if (!memcmp
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(dev->read_queue + offset, urb->transfer_buffer,
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dev->report_size)) {
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/* equal values on interface 0 will be ignored */
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spin_unlock(&dev->intr_idx_lock);
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goto exit;
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}
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}
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/* aux_idx become next intr_idx */
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aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1);
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if (read_idx == aux_idx) {
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/* queue full, dropping oldest input */
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read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx;
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atomic_set(&dev->read_idx, read_idx);
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atomic_set(&dev->overflow_flag, 1);
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}
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/* +1 for serial number */
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offset = intr_idx * (dev->report_size + 1);
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memcpy(dev->read_queue + offset, urb->transfer_buffer,
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dev->report_size);
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*(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++;
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atomic_set(&dev->intr_idx, aux_idx);
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spin_unlock(&dev->intr_idx_lock);
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/* tell the blocking read about the new data */
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wake_up_interruptible(&dev->read_wait);
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exit:
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval)
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dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n",
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__func__, retval);
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}
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/*
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* USB Callback handler for write-ops
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*/
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static void iowarrior_write_callback(struct urb *urb)
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{
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struct iowarrior *dev;
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int status = urb->status;
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dev = urb->context;
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/* sync/async unlink faults aren't errors */
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if (status &&
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!(status == -ENOENT ||
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status == -ECONNRESET || status == -ESHUTDOWN)) {
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|
|
dbg("%s - nonzero write bulk status received: %d",
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|
__func__, status);
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|
|
}
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|
|
/* free up our allocated buffer */
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|
|
usb_free_coherent(urb->dev, urb->transfer_buffer_length,
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|
|
urb->transfer_buffer, urb->transfer_dma);
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|
|
/* tell a waiting writer the interrupt-out-pipe is available again */
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|
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atomic_dec(&dev->write_busy);
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|
|
wake_up_interruptible(&dev->write_wait);
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|
|
}
|
|
|
|
|
|
/**
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|
|
* iowarrior_delete
|
|
|
*/
|
|
|
static inline void iowarrior_delete(struct iowarrior *dev)
|
|
|
{
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|
|
dbg("%s - minor %d", __func__, dev->minor);
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|
|
kfree(dev->int_in_buffer);
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|
|
usb_free_urb(dev->int_in_urb);
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|
|
kfree(dev->read_queue);
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|
|
kfree(dev);
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|
|
}
|
|
|
|
|
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/*---------------------*/
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|
|
/* fops implementation */
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|
|
/*---------------------*/
|
|
|
|
|
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static int read_index(struct iowarrior *dev)
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|
|
{
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|
|
int intr_idx, read_idx;
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|
|
|
|
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read_idx = atomic_read(&dev->read_idx);
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|
|
intr_idx = atomic_read(&dev->intr_idx);
|
|
|
|
|
|
return (read_idx == intr_idx ? -1 : read_idx);
|
|
|
}
|
|
|
|
|
|
/**
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|
|
* iowarrior_read
|
|
|
*/
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|
|
static ssize_t iowarrior_read(struct file *file, char __user *buffer,
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|
|
size_t count, loff_t *ppos)
|
|
|
{
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|
|
struct iowarrior *dev;
|
|
|
int read_idx;
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|
|
int offset;
|
|
|
|
|
|
dev = file->private_data;
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|
|
|
|
|
/* verify that the device wasn't unplugged */
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|
|
if (dev == NULL || !dev->present)
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|
|
return -ENODEV;
|
|
|
|
|
|
dbg("%s - minor %d, count = %zd", __func__, dev->minor, count);
|
|
|
|
|
|
/* read count must be packet size (+ time stamp) */
|
|
|
if ((count != dev->report_size)
|
|
|
&& (count != (dev->report_size + 1)))
|
|
|
return -EINVAL;
|
|
|
|
|
|
/* repeat until no buffer overrun in callback handler occur */
|
|
|
do {
|
|
|
atomic_set(&dev->overflow_flag, 0);
|
|
|
if ((read_idx = read_index(dev)) == -1) {
|
|
|
/* queue emty */
|
|
|
if (file->f_flags & O_NONBLOCK)
|
|
|
return -EAGAIN;
|
|
|
else {
|
|
|
//next line will return when there is either new data, or the device is unplugged
|
|
|
int r = wait_event_interruptible(dev->read_wait,
|
|
|
(!dev->present
|
|
|
|| (read_idx =
|
|
|
read_index
|
|
|
(dev)) !=
|
|
|
-1));
|
|
|
if (r) {
|
|
|
//we were interrupted by a signal
|
|
|
return -ERESTART;
|
|
|
}
|
|
|
if (!dev->present) {
|
|
|
//The device was unplugged
|
|
|
return -ENODEV;
|
|
|
}
|
|
|
if (read_idx == -1) {
|
|
|
// Can this happen ???
|
|
|
return 0;
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
offset = read_idx * (dev->report_size + 1);
|
|
|
if (copy_to_user(buffer, dev->read_queue + offset, count)) {
|
|
|
return -EFAULT;
|
|
|
}
|
|
|
} while (atomic_read(&dev->overflow_flag));
|
|
|
|
|
|
read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx;
|
|
|
atomic_set(&dev->read_idx, read_idx);
|
|
|
return count;
|
|
|
}
|
|
|
|
|
|
/*
|
|
|
* iowarrior_write
|
|
|
*/
|
|
|
static ssize_t iowarrior_write(struct file *file,
|
|
|
const char __user *user_buffer,
|
|
|
size_t count, loff_t *ppos)
|
|
|
{
|
|
|
struct iowarrior *dev;
|
|
|
int retval = 0;
|
|
|
char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */
|
|
|
struct urb *int_out_urb = NULL;
|
|
|
|
|
|
dev = file->private_data;
|
|
|
|
|
|
mutex_lock(&dev->mutex);
|
|
|
/* verify that the device wasn't unplugged */
|
|
|
if (!dev->present) {
|
|
|
retval = -ENODEV;
|
|
|
goto exit;
|
|
|
}
|
|
|
dbg("%s - minor %d, count = %zd", __func__, dev->minor, count);
|
|
|
/* if count is 0 we're already done */
|
|
|
if (count == 0) {
|
|
|
retval = 0;
|
|
|
goto exit;
|
|
|
}
|
|
|
/* We only accept full reports */
|
|
|
if (count != dev->report_size) {
|
|
|
retval = -EINVAL;
|
|
|
goto exit;
|
|
|
}
|
|
|
switch (dev->product_id) {
|
|
|
case USB_DEVICE_ID_CODEMERCS_IOW24:
|
|
|
case USB_DEVICE_ID_CODEMERCS_IOWPV1:
|
|
|
case USB_DEVICE_ID_CODEMERCS_IOWPV2:
|
|
|
case USB_DEVICE_ID_CODEMERCS_IOW40:
|
|
|
/* IOW24 and IOW40 use a synchronous call */
|
|
|
buf = kmalloc(count, GFP_KERNEL);
|
|
|
if (!buf) {
|
|
|
retval = -ENOMEM;
|
|
|
goto exit;
|
|
|
}
|
|
|
if (copy_from_user(buf, user_buffer, count)) {
|
|
|
retval = -EFAULT;
|
|
|
kfree(buf);
|
|
|
goto exit;
|
|
|
}
|
|
|
retval = usb_set_report(dev->interface, 2, 0, buf, count);
|
|
|
kfree(buf);
|
|
|
goto exit;
|
|
|
break;
|
|
|
case USB_DEVICE_ID_CODEMERCS_IOW56:
|
|
|
/* The IOW56 uses asynchronous IO and more urbs */
|
|
|
if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) {
|
|
|
/* Wait until we are below the limit for submitted urbs */
|
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
|
retval = -EAGAIN;
|
|
|
goto exit;
|
|
|
} else {
|
|
|
retval = wait_event_interruptible(dev->write_wait,
|
|
|
(!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT)));
|
|
|
if (retval) {
|
|
|
/* we were interrupted by a signal */
|
|
|
retval = -ERESTART;
|
|
|
goto exit;
|
|
|
}
|
|
|
if (!dev->present) {
|
|
|
/* The device was unplugged */
|
|
|
retval = -ENODEV;
|
|
|
goto exit;
|
|
|
}
|
|
|
if (!dev->opened) {
|
|
|
/* We were closed while waiting for an URB */
|
|
|
retval = -ENODEV;
|
|
|
goto exit;
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
atomic_inc(&dev->write_busy);
|
|
|
int_out_urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
|
if (!int_out_urb) {
|
|
|
retval = -ENOMEM;
|
|
|
dbg("%s Unable to allocate urb ", __func__);
|
|
|
goto error_no_urb;
|
|
|
}
|
|
|
buf = usb_alloc_coherent(dev->udev, dev->report_size,
|
|
|
GFP_KERNEL, &int_out_urb->transfer_dma);
|
|
|
if (!buf) {
|
|
|
retval = -ENOMEM;
|
|
|
dbg("%s Unable to allocate buffer ", __func__);
|
|
|
goto error_no_buffer;
|
|
|
}
|
|
|
usb_fill_int_urb(int_out_urb, dev->udev,
|
|
|
usb_sndintpipe(dev->udev,
|
|
|
dev->int_out_endpoint->bEndpointAddress),
|
|
|
buf, dev->report_size,
|
|
|
iowarrior_write_callback, dev,
|
|
|
dev->int_out_endpoint->bInterval);
|
|
|
int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
|
|
|
if (copy_from_user(buf, user_buffer, count)) {
|
|
|
retval = -EFAULT;
|
|
|
goto error;
|
|
|
}
|
|
|
retval = usb_submit_urb(int_out_urb, GFP_KERNEL);
|
|
|
if (retval) {
|
|
|
dbg("%s submit error %d for urb nr.%d", __func__,
|
|
|
retval, atomic_read(&dev->write_busy));
|
|
|
goto error;
|
|
|
}
|
|
|
/* submit was ok */
|
|
|
retval = count;
|
|
|
usb_free_urb(int_out_urb);
|
|
|
goto exit;
|
|
|
break;
|
|
|
default:
|
|
|
/* what do we have here ? An unsupported Product-ID ? */
|
|
|
dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n",
|
|
|
__func__, dev->product_id);
|
|
|
retval = -EFAULT;
|
|
|
goto exit;
|
|
|
break;
|
|
|
}
|
|
|
error:
|
|
|
usb_free_coherent(dev->udev, dev->report_size, buf,
|
|
|
int_out_urb->transfer_dma);
|
|
|
error_no_buffer:
|
|
|
usb_free_urb(int_out_urb);
|
|
|
error_no_urb:
|
|
|
atomic_dec(&dev->write_busy);
|
|
|
wake_up_interruptible(&dev->write_wait);
|
|
|
exit:
|
|
|
mutex_unlock(&dev->mutex);
|
|
|
return retval;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* iowarrior_ioctl
|
|
|
*/
|
|
|
static long iowarrior_ioctl(struct file *file, unsigned int cmd,
|
|
|
unsigned long arg)
|
|
|
{
|
|
|
struct iowarrior *dev = NULL;
|
|
|
__u8 *buffer;
|
|
|
__u8 __user *user_buffer;
|
|
|
int retval;
|
|
|
int io_res; /* checks for bytes read/written and copy_to/from_user results */
|
|
|
|
|
|
dev = file->private_data;
|
|
|
if (dev == NULL) {
|
|
|
return -ENODEV;
|
|
|
}
|
|
|
|
|
|
buffer = kzalloc(dev->report_size, GFP_KERNEL);
|
|
|
if (!buffer)
|
|
|
return -ENOMEM;
|
|
|
|
|
|
/* lock this object */
|
|
|
mutex_lock(&iowarrior_mutex);
|
|
|
mutex_lock(&dev->mutex);
|
|
|
|
|
|
/* verify that the device wasn't unplugged */
|
|
|
if (!dev->present) {
|
|
|
retval = -ENODEV;
|
|
|
goto error_out;
|
|
|
}
|
|
|
|
|
|
dbg("%s - minor %d, cmd 0x%.4x, arg %ld", __func__, dev->minor, cmd,
|
|
|
arg);
|
|
|
|
|
|
retval = 0;
|
|
|
io_res = 0;
|
|
|
switch (cmd) {
|
|
|
case IOW_WRITE:
|
|
|
if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 ||
|
|
|
dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 ||
|
|
|
dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 ||
|
|
|
dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) {
|
|
|
user_buffer = (__u8 __user *)arg;
|
|
|
io_res = copy_from_user(buffer, user_buffer,
|
|
|
dev->report_size);
|
|
|
if (io_res) {
|
|
|
retval = -EFAULT;
|
|
|
} else {
|
|
|
io_res = usb_set_report(dev->interface, 2, 0,
|
|
|
buffer,
|
|
|
dev->report_size);
|
|
|
if (io_res < 0)
|
|
|
retval = io_res;
|
|
|
}
|
|
|
} else {
|
|
|
retval = -EINVAL;
|
|
|
dev_err(&dev->interface->dev,
|
|
|
"ioctl 'IOW_WRITE' is not supported for product=0x%x.\n",
|
|
|
dev->product_id);
|
|
|
}
|
|
|
break;
|
|
|
case IOW_READ:
|
|
|
user_buffer = (__u8 __user *)arg;
|
|
|
io_res = usb_get_report(dev->udev,
|
|
|
dev->interface->cur_altsetting, 1, 0,
|
|
|
buffer, dev->report_size);
|
|
|
if (io_res < 0)
|
|
|
retval = io_res;
|
|
|
else {
|
|
|
io_res = copy_to_user(user_buffer, buffer, dev->report_size);
|
|
|
if (io_res)
|
|
|
retval = -EFAULT;
|
|
|
}
|
|
|
break;
|
|
|
case IOW_GETINFO:
|
|
|
{
|
|
|
/* Report available information for the device */
|
|
|
struct iowarrior_info info;
|
|
|
/* needed for power consumption */
|
|
|
struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc;
|
|
|
|
|
|
memset(&info, 0, sizeof(info));
|
|
|
/* directly from the descriptor */
|
|
|
info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
|
|
|
info.product = dev->product_id;
|
|
|
info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice);
|
|
|
|
|
|
/* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */
|
|
|
info.speed = le16_to_cpu(dev->udev->speed);
|
|
|
info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber;
|
|
|
info.report_size = dev->report_size;
|
|
|
|
|
|
/* serial number string has been read earlier 8 chars or empty string */
|
|
|
memcpy(info.serial, dev->chip_serial,
|
|
|
sizeof(dev->chip_serial));
|
|
|
if (cfg_descriptor == NULL) {
|
|
|
info.power = -1; /* no information available */
|
|
|
} else {
|
|
|
/* the MaxPower is stored in units of 2mA to make it fit into a byte-value */
|
|
|
info.power = cfg_descriptor->bMaxPower * 2;
|
|
|
}
|
|
|
io_res = copy_to_user((struct iowarrior_info __user *)arg, &info,
|
|
|
sizeof(struct iowarrior_info));
|
|
|
if (io_res)
|
|
|
retval = -EFAULT;
|
|
|
break;
|
|
|
}
|
|
|
default:
|
|
|
/* return that we did not understand this ioctl call */
|
|
|
retval = -ENOTTY;
|
|
|
break;
|
|
|
}
|
|
|
error_out:
|
|
|
/* unlock the device */
|
|
|
mutex_unlock(&dev->mutex);
|
|
|
mutex_unlock(&iowarrior_mutex);
|
|
|
kfree(buffer);
|
|
|
return retval;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* iowarrior_open
|
|
|
*/
|
|
|
static int iowarrior_open(struct inode *inode, struct file *file)
|
|
|
{
|
|
|
struct iowarrior *dev = NULL;
|
|
|
struct usb_interface *interface;
|
|
|
int subminor;
|
|
|
int retval = 0;
|
|
|
|
|
|
dbg("%s", __func__);
|
|
|
|
|
|
mutex_lock(&iowarrior_mutex);
|
|
|
subminor = iminor(inode);
|
|
|
|
|
|
interface = usb_find_interface(&iowarrior_driver, subminor);
|
|
|
if (!interface) {
|
|
|
mutex_unlock(&iowarrior_mutex);
|
|
|
err("%s - error, can't find device for minor %d", __func__,
|
|
|
subminor);
|
|
|
return -ENODEV;
|
|
|
}
|
|
|
|
|
|
mutex_lock(&iowarrior_open_disc_lock);
|
|
|
dev = usb_get_intfdata(interface);
|
|
|
if (!dev) {
|
|
|
mutex_unlock(&iowarrior_open_disc_lock);
|
|
|
mutex_unlock(&iowarrior_mutex);
|
|
|
return -ENODEV;
|
|
|
}
|
|
|
|
|
|
mutex_lock(&dev->mutex);
|
|
|
mutex_unlock(&iowarrior_open_disc_lock);
|
|
|
|
|
|
/* Only one process can open each device, no sharing. */
|
|
|
if (dev->opened) {
|
|
|
retval = -EBUSY;
|
|
|
goto out;
|
|
|
}
|
|
|
|
|
|
/* setup interrupt handler for receiving values */
|
|
|
if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) {
|
|
|
dev_err(&interface->dev, "Error %d while submitting URB\n", retval);
|
|
|
retval = -EFAULT;
|
|
|
goto out;
|
|
|
}
|
|
|
/* increment our usage count for the driver */
|
|
|
++dev->opened;
|
|
|
/* save our object in the file's private structure */
|
|
|
file->private_data = dev;
|
|
|
retval = 0;
|
|
|
|
|
|
out:
|
|
|
mutex_unlock(&dev->mutex);
|
|
|
mutex_unlock(&iowarrior_mutex);
|
|
|
return retval;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* iowarrior_release
|
|
|
*/
|
|
|
static int iowarrior_release(struct inode *inode, struct file *file)
|
|
|
{
|
|
|
struct iowarrior *dev;
|
|
|
int retval = 0;
|
|
|
|
|
|
dev = file->private_data;
|
|
|
if (dev == NULL) {
|
|
|
return -ENODEV;
|
|
|
}
|
|
|
|
|
|
dbg("%s - minor %d", __func__, dev->minor);
|
|
|
|
|
|
/* lock our device */
|
|
|
mutex_lock(&dev->mutex);
|
|
|
|
|
|
if (dev->opened <= 0) {
|
|
|
retval = -ENODEV; /* close called more than once */
|
|
|
mutex_unlock(&dev->mutex);
|
|
|
} else {
|
|
|
dev->opened = 0; /* we're closeing now */
|
|
|
retval = 0;
|
|
|
if (dev->present) {
|
|
|
/*
|
|
|
The device is still connected so we only shutdown
|
|
|
pending read-/write-ops.
|
|
|
*/
|
|
|
usb_kill_urb(dev->int_in_urb);
|
|
|
wake_up_interruptible(&dev->read_wait);
|
|
|
wake_up_interruptible(&dev->write_wait);
|
|
|
mutex_unlock(&dev->mutex);
|
|
|
} else {
|
|
|
/* The device was unplugged, cleanup resources */
|
|
|
mutex_unlock(&dev->mutex);
|
|
|
iowarrior_delete(dev);
|
|
|
}
|
|
|
}
|
|
|
return retval;
|
|
|
}
|
|
|
|
|
|
static unsigned iowarrior_poll(struct file *file, poll_table * wait)
|
|
|
{
|
|
|
struct iowarrior *dev = file->private_data;
|
|
|
unsigned int mask = 0;
|
|
|
|
|
|
if (!dev->present)
|
|
|
return POLLERR | POLLHUP;
|
|
|
|
|
|
poll_wait(file, &dev->read_wait, wait);
|
|
|
poll_wait(file, &dev->write_wait, wait);
|
|
|
|
|
|
if (!dev->present)
|
|
|
return POLLERR | POLLHUP;
|
|
|
|
|
|
if (read_index(dev) != -1)
|
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
|
|
if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT)
|
|
|
mask |= POLLOUT | POLLWRNORM;
|
|
|
return mask;
|
|
|
}
|
|
|
|
|
|
/*
|
|
|
* File operations needed when we register this driver.
|
|
|
* This assumes that this driver NEEDS file operations,
|
|
|
* of course, which means that the driver is expected
|
|
|
* to have a node in the /dev directory. If the USB
|
|
|
* device were for a network interface then the driver
|
|
|
* would use "struct net_driver" instead, and a serial
|
|
|
* device would use "struct tty_driver".
|
|
|
*/
|
|
|
static const struct file_operations iowarrior_fops = {
|
|
|
.owner = THIS_MODULE,
|
|
|
.write = iowarrior_write,
|
|
|
.read = iowarrior_read,
|
|
|
.unlocked_ioctl = iowarrior_ioctl,
|
|
|
.open = iowarrior_open,
|
|
|
.release = iowarrior_release,
|
|
|
.poll = iowarrior_poll,
|
|
|
.llseek = noop_llseek,
|
|
|
};
|
|
|
|
|
|
static char *iowarrior_devnode(struct device *dev, umode_t *mode)
|
|
|
{
|
|
|
return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
|
|
|
}
|
|
|
|
|
|
/*
|
|
|
* usb class driver info in order to get a minor number from the usb core,
|
|
|
* and to have the device registered with devfs and the driver core
|
|
|
*/
|
|
|
static struct usb_class_driver iowarrior_class = {
|
|
|
.name = "iowarrior%d",
|
|
|
.devnode = iowarrior_devnode,
|
|
|
.fops = &iowarrior_fops,
|
|
|
.minor_base = IOWARRIOR_MINOR_BASE,
|
|
|
};
|
|
|
|
|
|
/*---------------------------------*/
|
|
|
/* probe and disconnect functions */
|
|
|
/*---------------------------------*/
|
|
|
/**
|
|
|
* iowarrior_probe
|
|
|
*
|
|
|
* Called by the usb core when a new device is connected that it thinks
|
|
|
* this driver might be interested in.
|
|
|
*/
|
|
|
static int iowarrior_probe(struct usb_interface *interface,
|
|
|
const struct usb_device_id *id)
|
|
|
{
|
|
|
struct usb_device *udev = interface_to_usbdev(interface);
|
|
|
struct iowarrior *dev = NULL;
|
|
|
struct usb_host_interface *iface_desc;
|
|
|
struct usb_endpoint_descriptor *endpoint;
|
|
|
int i;
|
|
|
int retval = -ENOMEM;
|
|
|
|
|
|
/* allocate memory for our device state and initialize it */
|
|
|
dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL);
|
|
|
if (dev == NULL) {
|
|
|
dev_err(&interface->dev, "Out of memory\n");
|
|
|
return retval;
|
|
|
}
|
|
|
|
|
|
mutex_init(&dev->mutex);
|
|
|
|
|
|
atomic_set(&dev->intr_idx, 0);
|
|
|
atomic_set(&dev->read_idx, 0);
|
|
|
spin_lock_init(&dev->intr_idx_lock);
|
|
|
atomic_set(&dev->overflow_flag, 0);
|
|
|
init_waitqueue_head(&dev->read_wait);
|
|
|
atomic_set(&dev->write_busy, 0);
|
|
|
init_waitqueue_head(&dev->write_wait);
|
|
|
|
|
|
dev->udev = udev;
|
|
|
dev->interface = interface;
|
|
|
|
|
|
iface_desc = interface->cur_altsetting;
|
|
|
dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
|
|
|
|
|
|
/* set up the endpoint information */
|
|
|
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
|
|
|
endpoint = &iface_desc->endpoint[i].desc;
|
|
|
|
|
|
if (usb_endpoint_is_int_in(endpoint))
|
|
|
dev->int_in_endpoint = endpoint;
|
|
|
if (usb_endpoint_is_int_out(endpoint))
|
|
|
/* this one will match for the IOWarrior56 only */
|
|
|
dev->int_out_endpoint = endpoint;
|
|
|
}
|
|
|
/* we have to check the report_size often, so remember it in the endianess suitable for our machine */
|
|
|
dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint);
|
|
|
if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&
|
|
|
(dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56))
|
|
|
/* IOWarrior56 has wMaxPacketSize different from report size */
|
|
|
dev->report_size = 7;
|
|
|
|
|
|
/* create the urb and buffer for reading */
|
|
|
dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
|
if (!dev->int_in_urb) {
|
|
|
dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n");
|
|
|
goto error;
|
|
|
}
|
|
|
dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL);
|
|
|
if (!dev->int_in_buffer) {
|
|
|
dev_err(&interface->dev, "Couldn't allocate int_in_buffer\n");
|
|
|
goto error;
|
|
|
}
|
|
|
usb_fill_int_urb(dev->int_in_urb, dev->udev,
|
|
|
usb_rcvintpipe(dev->udev,
|
|
|
dev->int_in_endpoint->bEndpointAddress),
|
|
|
dev->int_in_buffer, dev->report_size,
|
|
|
iowarrior_callback, dev,
|
|
|
dev->int_in_endpoint->bInterval);
|
|
|
/* create an internal buffer for interrupt data from the device */
|
|
|
dev->read_queue =
|
|
|
kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER),
|
|
|
GFP_KERNEL);
|
|
|
if (!dev->read_queue) {
|
|
|
dev_err(&interface->dev, "Couldn't allocate read_queue\n");
|
|
|
goto error;
|
|
|
}
|
|
|
/* Get the serial-number of the chip */
|
|
|
memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
|
|
|
usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial,
|
|
|
sizeof(dev->chip_serial));
|
|
|
if (strlen(dev->chip_serial) != 8)
|
|
|
memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
|
|
|
|
|
|
/* Set the idle timeout to 0, if this is interface 0 */
|
|
|
if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) {
|
|
|
usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
|
|
|
0x0A,
|
|
|
USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
|
|
|
0, NULL, 0, USB_CTRL_SET_TIMEOUT);
|
|
|
}
|
|
|
/* allow device read and ioctl */
|
|
|
dev->present = 1;
|
|
|
|
|
|
/* we can register the device now, as it is ready */
|
|
|
usb_set_intfdata(interface, dev);
|
|
|
|
|
|
retval = usb_register_dev(interface, &iowarrior_class);
|
|
|
if (retval) {
|
|
|
/* something prevented us from registering this driver */
|
|
|
dev_err(&interface->dev, "Not able to get a minor for this device.\n");
|
|
|
usb_set_intfdata(interface, NULL);
|
|
|
goto error;
|
|
|
}
|
|
|
|
|
|
dev->minor = interface->minor;
|
|
|
|
|
|
/* let the user know what node this device is now attached to */
|
|
|
dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d "
|
|
|
"now attached to iowarrior%d\n", dev->product_id, dev->chip_serial,
|
|
|
iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE);
|
|
|
return retval;
|
|
|
|
|
|
error:
|
|
|
iowarrior_delete(dev);
|
|
|
return retval;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* iowarrior_disconnect
|
|
|
*
|
|
|
* Called by the usb core when the device is removed from the system.
|
|
|
*/
|
|
|
static void iowarrior_disconnect(struct usb_interface *interface)
|
|
|
{
|
|
|
struct iowarrior *dev;
|
|
|
int minor;
|
|
|
|
|
|
dev = usb_get_intfdata(interface);
|
|
|
mutex_lock(&iowarrior_open_disc_lock);
|
|
|
usb_set_intfdata(interface, NULL);
|
|
|
|
|
|
minor = dev->minor;
|
|
|
|
|
|
/* give back our minor */
|
|
|
usb_deregister_dev(interface, &iowarrior_class);
|
|
|
|
|
|
mutex_lock(&dev->mutex);
|
|
|
|
|
|
/* prevent device read, write and ioctl */
|
|
|
dev->present = 0;
|
|
|
|
|
|
mutex_unlock(&dev->mutex);
|
|
|
mutex_unlock(&iowarrior_open_disc_lock);
|
|
|
|
|
|
if (dev->opened) {
|
|
|
/* There is a process that holds a filedescriptor to the device ,
|
|
|
so we only shutdown read-/write-ops going on.
|
|
|
Deleting the device is postponed until close() was called.
|
|
|
*/
|
|
|
usb_kill_urb(dev->int_in_urb);
|
|
|
wake_up_interruptible(&dev->read_wait);
|
|
|
wake_up_interruptible(&dev->write_wait);
|
|
|
} else {
|
|
|
/* no process is using the device, cleanup now */
|
|
|
iowarrior_delete(dev);
|
|
|
}
|
|
|
|
|
|
dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n",
|
|
|
minor - IOWARRIOR_MINOR_BASE);
|
|
|
}
|
|
|
|
|
|
/* usb specific object needed to register this driver with the usb subsystem */
|
|
|
static struct usb_driver iowarrior_driver = {
|
|
|
.name = "iowarrior",
|
|
|
.probe = iowarrior_probe,
|
|
|
.disconnect = iowarrior_disconnect,
|
|
|
.id_table = iowarrior_ids,
|
|
|
};
|
|
|
|
|
|
module_usb_driver(iowarrior_driver);
|
|
|
|