diff options
Diffstat (limited to 'drivers/usb/misc/iowarrior.c')
| -rw-r--r-- | drivers/usb/misc/iowarrior.c | 926 |
1 files changed, 926 insertions, 0 deletions
diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c new file mode 100644 index 000000000..b421f1326 --- /dev/null +++ b/drivers/usb/misc/iowarrior.c @@ -0,0 +1,926 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Native support for the I/O-Warrior USB devices + * + * Copyright (c) 2003-2005, 2020 Code Mercenaries GmbH + * written by Christian Lucht <lucht@codemercs.com> and + * Christoph Jung <jung@codemercs.com> + * + * based on + + * usb-skeleton.c by Greg Kroah-Hartman <greg@kroah.com> + * brlvger.c by Stephane Dalton <sdalton@videotron.ca> + * and Stephane Doyon <s.doyon@videotron.ca> + * + * Released under the GPLv2. + */ + +#include <linux/module.h> +#include <linux/usb.h> +#include <linux/slab.h> +#include <linux/sched.h> +#include <linux/mutex.h> +#include <linux/poll.h> +#include <linux/usb/iowarrior.h> + +#define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>" +#define DRIVER_DESC "USB IO-Warrior driver" + +#define USB_VENDOR_ID_CODEMERCS 1984 +/* low speed iowarrior */ +#define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500 +#define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501 +#define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511 +#define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512 +/* full speed iowarrior */ +#define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503 +/* fuller speed iowarrior */ +#define USB_DEVICE_ID_CODEMERCS_IOW28 0x1504 +#define USB_DEVICE_ID_CODEMERCS_IOW28L 0x1505 +#define USB_DEVICE_ID_CODEMERCS_IOW100 0x1506 + +/* OEMed devices */ +#define USB_DEVICE_ID_CODEMERCS_IOW24SAG 0x158a +#define USB_DEVICE_ID_CODEMERCS_IOW56AM 0x158b + +/* Get a minor range for your devices from the usb maintainer */ +#ifdef CONFIG_USB_DYNAMIC_MINORS +#define IOWARRIOR_MINOR_BASE 0 +#else +#define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not official yet +#endif + +/* interrupt input queue size */ +#define MAX_INTERRUPT_BUFFER 16 +/* + maximum number of urbs that are submitted for writes at the same time, + this applies to the IOWarrior56 only! + IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls. +*/ +#define MAX_WRITES_IN_FLIGHT 4 + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL"); + +static struct usb_driver iowarrior_driver; + +/*--------------*/ +/* data */ +/*--------------*/ + +/* Structure to hold all of our device specific stuff */ +struct iowarrior { + struct mutex mutex; /* locks this structure */ + struct usb_device *udev; /* save off the usb device pointer */ + struct usb_interface *interface; /* the interface for this device */ + unsigned char minor; /* the starting minor number for this device */ + struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */ + struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */ + struct urb *int_in_urb; /* the urb for reading data */ + unsigned char *int_in_buffer; /* buffer for data to be read */ + unsigned char serial_number; /* to detect lost packages */ + unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */ + wait_queue_head_t read_wait; + wait_queue_head_t write_wait; /* wait-queue for writing to the device */ + atomic_t write_busy; /* number of write-urbs submitted */ + atomic_t read_idx; + atomic_t intr_idx; + atomic_t overflow_flag; /* signals an index 'rollover' */ + int present; /* this is 1 as long as the device is connected */ + int opened; /* this is 1 if the device is currently open */ + char chip_serial[9]; /* the serial number string of the chip connected */ + int report_size; /* number of bytes in a report */ + u16 product_id; + struct usb_anchor submitted; +}; + +/*--------------*/ +/* globals */ +/*--------------*/ + +#define USB_REQ_GET_REPORT 0x01 +//#if 0 +static int usb_get_report(struct usb_device *dev, + struct usb_host_interface *inter, unsigned char type, + unsigned char id, void *buf, int size) +{ + return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), + USB_REQ_GET_REPORT, + USB_DIR_IN | USB_TYPE_CLASS | + USB_RECIP_INTERFACE, (type << 8) + id, + inter->desc.bInterfaceNumber, buf, size, + USB_CTRL_GET_TIMEOUT); +} +//#endif + +#define USB_REQ_SET_REPORT 0x09 + +static int usb_set_report(struct usb_interface *intf, unsigned char type, + unsigned char id, void *buf, int size) +{ + return usb_control_msg(interface_to_usbdev(intf), + usb_sndctrlpipe(interface_to_usbdev(intf), 0), + USB_REQ_SET_REPORT, + USB_TYPE_CLASS | USB_RECIP_INTERFACE, + (type << 8) + id, + intf->cur_altsetting->desc.bInterfaceNumber, buf, + size, 1000); +} + +/*---------------------*/ +/* driver registration */ +/*---------------------*/ +/* table of devices that work with this driver */ +static const struct usb_device_id iowarrior_ids[] = { + {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)}, + {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)}, + {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)}, + {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)}, + {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)}, + {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24SAG)}, + {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56AM)}, + {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW28)}, + {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW28L)}, + {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW100)}, + {} /* Terminating entry */ +}; +MODULE_DEVICE_TABLE(usb, iowarrior_ids); + +/* + * USB callback handler for reading data + */ +static void iowarrior_callback(struct urb *urb) +{ + struct iowarrior *dev = urb->context; + int intr_idx; + int read_idx; + int aux_idx; + int offset; + int status = urb->status; + int retval; + + switch (status) { + case 0: + /* success */ + break; + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + return; + default: + goto exit; + } + + intr_idx = atomic_read(&dev->intr_idx); + /* aux_idx become previous intr_idx */ + aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1); + read_idx = atomic_read(&dev->read_idx); + + /* queue is not empty and it's interface 0 */ + if ((intr_idx != read_idx) + && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) { + /* + 1 for serial number */ + offset = aux_idx * (dev->report_size + 1); + if (!memcmp + (dev->read_queue + offset, urb->transfer_buffer, + dev->report_size)) { + /* equal values on interface 0 will be ignored */ + goto exit; + } + } + + /* aux_idx become next intr_idx */ + aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1); + if (read_idx == aux_idx) { + /* queue full, dropping oldest input */ + read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx; + atomic_set(&dev->read_idx, read_idx); + atomic_set(&dev->overflow_flag, 1); + } + + /* +1 for serial number */ + offset = intr_idx * (dev->report_size + 1); + memcpy(dev->read_queue + offset, urb->transfer_buffer, + dev->report_size); + *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++; + + atomic_set(&dev->intr_idx, aux_idx); + /* tell the blocking read about the new data */ + wake_up_interruptible(&dev->read_wait); + +exit: + retval = usb_submit_urb(urb, GFP_ATOMIC); + if (retval) + dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n", + __func__, retval); + +} + +/* + * USB Callback handler for write-ops + */ +static void iowarrior_write_callback(struct urb *urb) +{ + struct iowarrior *dev; + int status = urb->status; + + dev = urb->context; + /* sync/async unlink faults aren't errors */ + if (status && + !(status == -ENOENT || + status == -ECONNRESET || status == -ESHUTDOWN)) { + dev_dbg(&dev->interface->dev, + "nonzero write bulk status received: %d\n", status); + } + /* free up our allocated buffer */ + usb_free_coherent(urb->dev, urb->transfer_buffer_length, + urb->transfer_buffer, urb->transfer_dma); + /* tell a waiting writer the interrupt-out-pipe is available again */ + atomic_dec(&dev->write_busy); + wake_up_interruptible(&dev->write_wait); +} + +/* + * iowarrior_delete + */ +static inline void iowarrior_delete(struct iowarrior *dev) +{ + dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor); + kfree(dev->int_in_buffer); + usb_free_urb(dev->int_in_urb); + kfree(dev->read_queue); + usb_put_intf(dev->interface); + kfree(dev); +} + +/*---------------------*/ +/* fops implementation */ +/*---------------------*/ + +static int read_index(struct iowarrior *dev) +{ + int intr_idx, read_idx; + + read_idx = atomic_read(&dev->read_idx); + intr_idx = atomic_read(&dev->intr_idx); + + return (read_idx == intr_idx ? -1 : read_idx); +} + +/* + * iowarrior_read + */ +static ssize_t iowarrior_read(struct file *file, char __user *buffer, + size_t count, loff_t *ppos) +{ + struct iowarrior *dev; + int read_idx; + int offset; + + dev = file->private_data; + + /* verify that the device wasn't unplugged */ + if (!dev || !dev->present) + return -ENODEV; + + dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n", + 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 empty */ + 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; + } + dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n", + 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_IOW24SAG: + 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 = memdup_user(user_buffer, count); + if (IS_ERR(buf)) { + retval = PTR_ERR(buf); + goto exit; + } + retval = usb_set_report(dev->interface, 2, 0, buf, count); + kfree(buf); + goto exit; + case USB_DEVICE_ID_CODEMERCS_IOW56: + case USB_DEVICE_ID_CODEMERCS_IOW56AM: + case USB_DEVICE_ID_CODEMERCS_IOW28: + case USB_DEVICE_ID_CODEMERCS_IOW28L: + case USB_DEVICE_ID_CODEMERCS_IOW100: + /* 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; + goto error_no_urb; + } + buf = usb_alloc_coherent(dev->udev, dev->report_size, + GFP_KERNEL, &int_out_urb->transfer_dma); + if (!buf) { + retval = -ENOMEM; + dev_dbg(&dev->interface->dev, + "Unable to allocate buffer\n"); + 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; + } + usb_anchor_urb(int_out_urb, &dev->submitted); + retval = usb_submit_urb(int_out_urb, GFP_KERNEL); + if (retval) { + dev_dbg(&dev->interface->dev, + "submit error %d for urb nr.%d\n", + retval, atomic_read(&dev->write_busy)); + usb_unanchor_urb(int_out_urb); + goto error; + } + /* submit was ok */ + retval = count; + usb_free_urb(int_out_urb); + goto exit; + 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; + } +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) + return -ENODEV; + + buffer = kzalloc(dev->report_size, GFP_KERNEL); + if (!buffer) + return -ENOMEM; + + mutex_lock(&dev->mutex); + + /* verify that the device wasn't unplugged */ + if (!dev->present) { + retval = -ENODEV; + goto error_out; + } + + dev_dbg(&dev->interface->dev, "minor %d, cmd 0x%.4x, arg %ld\n", + 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_IOW24SAG || + 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 = 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); + 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; + + subminor = iminor(inode); + + interface = usb_find_interface(&iowarrior_driver, subminor); + if (!interface) { + pr_err("%s - error, can't find device for minor %d\n", + __func__, subminor); + return -ENODEV; + } + + dev = usb_get_intfdata(interface); + if (!dev) + return -ENODEV; + + mutex_lock(&dev->mutex); + + /* 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); + 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) + return -ENODEV; + + dev_dbg(&dev->interface->dev, "minor %d\n", 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 closing 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 __poll_t iowarrior_poll(struct file *file, poll_table * wait) +{ + struct iowarrior *dev = file->private_data; + __poll_t mask = 0; + + if (!dev->present) + return EPOLLERR | EPOLLHUP; + + poll_wait(file, &dev->read_wait, wait); + poll_wait(file, &dev->write_wait, wait); + + if (!dev->present) + return EPOLLERR | EPOLLHUP; + + if (read_index(dev) != -1) + mask |= EPOLLIN | EPOLLRDNORM; + + if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT) + mask |= EPOLLOUT | EPOLLWRNORM; + 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; + int retval = -ENOMEM; + int res; + + /* allocate memory for our device state and initialize it */ + dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL); + if (!dev) + return retval; + + mutex_init(&dev->mutex); + + atomic_set(&dev->intr_idx, 0); + atomic_set(&dev->read_idx, 0); + 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 = usb_get_intf(interface); + + iface_desc = interface->cur_altsetting; + dev->product_id = le16_to_cpu(udev->descriptor.idProduct); + + init_usb_anchor(&dev->submitted); + + res = usb_find_last_int_in_endpoint(iface_desc, &dev->int_in_endpoint); + if (res) { + dev_err(&interface->dev, "no interrupt-in endpoint found\n"); + retval = res; + goto error; + } + + if ((dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) || + (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56AM) || + (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW28) || + (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW28L) || + (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW100)) { + res = usb_find_last_int_out_endpoint(iface_desc, + &dev->int_out_endpoint); + if (res) { + dev_err(&interface->dev, "no interrupt-out endpoint found\n"); + retval = res; + goto error; + } + } + + /* we have to check the report_size often, so remember it in the endianness suitable for our machine */ + dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint); + + /* + * Some devices need the report size to be different than the + * endpoint size. + */ + if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) { + switch (dev->product_id) { + case USB_DEVICE_ID_CODEMERCS_IOW56: + case USB_DEVICE_ID_CODEMERCS_IOW56AM: + dev->report_size = 7; + break; + + case USB_DEVICE_ID_CODEMERCS_IOW28: + case USB_DEVICE_ID_CODEMERCS_IOW28L: + dev->report_size = 4; + break; + + case USB_DEVICE_ID_CODEMERCS_IOW100: + dev->report_size = 12; + break; + } + } + + /* create the urb and buffer for reading */ + dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL); + if (!dev->int_in_urb) + goto error; + dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL); + if (!dev->int_in_buffer) + 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_array(dev->report_size + 1, MAX_INTERRUPT_BUFFER, + GFP_KERNEL); + if (!dev->read_queue) + 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"); + 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 = usb_get_intfdata(interface); + int minor = dev->minor; + + usb_deregister_dev(interface, &iowarrior_class); + + mutex_lock(&dev->mutex); + + /* prevent device read, write and ioctl */ + dev->present = 0; + + 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); + usb_kill_anchored_urbs(&dev->submitted); + wake_up_interruptible(&dev->read_wait); + wake_up_interruptible(&dev->write_wait); + mutex_unlock(&dev->mutex); + } else { + /* no process is using the device, cleanup now */ + mutex_unlock(&dev->mutex); + 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); 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