| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Native support for the I/O-Warrior USB devices |
| * |
| * Copyright (c) 2003-2005 Code Mercenaries GmbH |
| * written by Christian Lucht <lucht@codemercs.com> |
| * |
| * based on |
| |
| * usb-skeleton.c by Greg Kroah-Hartman <greg@kroah.com> |
| * brlvger.c by Stephane Dalton <sdalton@videotron.ca> |
| * and St�hane 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 |
| |
| /* 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"); |
| |
| /* Module parameters */ |
| static DEFINE_MUTEX(iowarrior_mutex); |
| |
| static struct usb_driver iowarrior_driver; |
| static DEFINE_MUTEX(iowarrior_open_disc_lock); |
| |
| /*--------------*/ |
| /* 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; |
| spinlock_t intr_idx_lock; /* protects 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; |
| }; |
| |
| /*--------------*/ |
| /* globals */ |
| /*--------------*/ |
| |
| /* |
| * USB spec identifies 5 second timeouts. |
| */ |
| #define GET_TIMEOUT 5 |
| #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, |
| GET_TIMEOUT*HZ); |
| } |
| //#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, HZ); |
| } |
| |
| /*---------------------*/ |
| /* 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)}, |
| {} /* 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; |
| } |
| |
| spin_lock(&dev->intr_idx_lock); |
| 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 */ |
| spin_unlock(&dev->intr_idx_lock); |
| 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); |
| spin_unlock(&dev->intr_idx_lock); |
| /* 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); |
| 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_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; |
| 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; |
| 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; |
| } |
| 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)); |
| 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) |
| 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; |
| } |
| |
| 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_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); |
| 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; |
| |
| mutex_lock(&iowarrior_mutex); |
| subminor = iminor(inode); |
| |
| interface = usb_find_interface(&iowarrior_driver, subminor); |
| if (!interface) { |
| mutex_unlock(&iowarrior_mutex); |
| printk(KERN_ERR "%s - error, can't find device for minor %d\n", |
| __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) |
| 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 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; |
| 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); |
| 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); |
| |
| 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) { |
| 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); |
| 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) |
| 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(((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"); |
| 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); |