![Ian Abbott](/assets/img/avatar_default.png)
Some comedi drivers should return an error from their 'open' method when something goes wrong. Change the prototype of the 'open' method in 'struct comedi_device' to allow this, and change the drivers that use it. Propagate any error to the 'open' file operation. The corresponding 'close' method won't be called when the 'open' method fails, so drivers failing the 'open' need to clean up any mess they created. The dt9812 and serial2002 drivers can now return an error on 'open'. The jr3_pci driver also uses the 'open' method but doesn't fail it. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2638 lines
61 KiB
C
2638 lines
61 KiB
C
/*
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comedi/comedi_fops.c
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comedi kernel module
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COMEDI - Linux Control and Measurement Device Interface
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Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#undef DEBUG
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#define __NO_VERSION__
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#include "comedi_fops.h"
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#include "comedi_compat32.h"
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/fcntl.h>
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#include <linux/delay.h>
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#include <linux/ioport.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/kmod.h>
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#include <linux/poll.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/vmalloc.h>
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#include <linux/fs.h>
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#include "comedidev.h"
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#include <linux/cdev.h>
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#include <linux/stat.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include "internal.h"
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MODULE_AUTHOR("http://www.comedi.org");
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MODULE_DESCRIPTION("Comedi core module");
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MODULE_LICENSE("GPL");
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#ifdef CONFIG_COMEDI_DEBUG
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int comedi_debug;
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EXPORT_SYMBOL(comedi_debug);
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module_param(comedi_debug, int, 0644);
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#endif
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int comedi_autoconfig = 1;
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module_param(comedi_autoconfig, bool, 0444);
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static int comedi_num_legacy_minors;
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module_param(comedi_num_legacy_minors, int, 0444);
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static DEFINE_SPINLOCK(comedi_file_info_table_lock);
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static struct comedi_device_file_info
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*comedi_file_info_table[COMEDI_NUM_MINORS];
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static int do_devconfig_ioctl(struct comedi_device *dev,
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struct comedi_devconfig __user *arg);
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static int do_bufconfig_ioctl(struct comedi_device *dev,
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struct comedi_bufconfig __user *arg);
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static int do_devinfo_ioctl(struct comedi_device *dev,
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struct comedi_devinfo __user *arg,
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struct file *file);
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static int do_subdinfo_ioctl(struct comedi_device *dev,
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struct comedi_subdinfo __user *arg, void *file);
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static int do_chaninfo_ioctl(struct comedi_device *dev,
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struct comedi_chaninfo __user *arg);
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static int do_bufinfo_ioctl(struct comedi_device *dev,
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struct comedi_bufinfo __user *arg, void *file);
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static int do_cmd_ioctl(struct comedi_device *dev,
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struct comedi_cmd __user *arg, void *file);
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static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
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void *file);
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static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
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void *file);
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static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
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void *file);
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static int do_cmdtest_ioctl(struct comedi_device *dev,
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struct comedi_cmd __user *arg, void *file);
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static int do_insnlist_ioctl(struct comedi_device *dev,
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struct comedi_insnlist __user *arg, void *file);
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static int do_insn_ioctl(struct comedi_device *dev,
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struct comedi_insn __user *arg, void *file);
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static int do_poll_ioctl(struct comedi_device *dev, unsigned int subd,
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void *file);
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extern void do_become_nonbusy(struct comedi_device *dev,
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struct comedi_subdevice *s);
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static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
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static int comedi_fasync(int fd, struct file *file, int on);
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static int is_device_busy(struct comedi_device *dev);
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static int resize_async_buffer(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct comedi_async *async, unsigned new_size);
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/* declarations for sysfs attribute files */
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static struct device_attribute dev_attr_max_read_buffer_kb;
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static struct device_attribute dev_attr_read_buffer_kb;
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static struct device_attribute dev_attr_max_write_buffer_kb;
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static struct device_attribute dev_attr_write_buffer_kb;
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static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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const unsigned minor = iminor(file->f_dentry->d_inode);
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struct comedi_device_file_info *dev_file_info =
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comedi_get_device_file_info(minor);
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struct comedi_device *dev;
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int rc;
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if (dev_file_info == NULL || dev_file_info->device == NULL)
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return -ENODEV;
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dev = dev_file_info->device;
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mutex_lock(&dev->mutex);
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/* Device config is special, because it must work on
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* an unconfigured device. */
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if (cmd == COMEDI_DEVCONFIG) {
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rc = do_devconfig_ioctl(dev,
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(struct comedi_devconfig __user *)arg);
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goto done;
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}
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if (!dev->attached) {
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DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor);
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rc = -ENODEV;
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goto done;
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}
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switch (cmd) {
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case COMEDI_BUFCONFIG:
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rc = do_bufconfig_ioctl(dev,
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(struct comedi_bufconfig __user *)arg);
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break;
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case COMEDI_DEVINFO:
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rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
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file);
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break;
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case COMEDI_SUBDINFO:
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rc = do_subdinfo_ioctl(dev,
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(struct comedi_subdinfo __user *)arg,
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file);
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break;
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case COMEDI_CHANINFO:
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rc = do_chaninfo_ioctl(dev, (void __user *)arg);
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break;
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case COMEDI_RANGEINFO:
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rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
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break;
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case COMEDI_BUFINFO:
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rc = do_bufinfo_ioctl(dev,
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(struct comedi_bufinfo __user *)arg,
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file);
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break;
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case COMEDI_LOCK:
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rc = do_lock_ioctl(dev, arg, file);
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break;
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case COMEDI_UNLOCK:
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rc = do_unlock_ioctl(dev, arg, file);
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break;
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case COMEDI_CANCEL:
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rc = do_cancel_ioctl(dev, arg, file);
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break;
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case COMEDI_CMD:
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rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
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break;
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case COMEDI_CMDTEST:
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rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
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file);
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break;
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case COMEDI_INSNLIST:
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rc = do_insnlist_ioctl(dev,
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(struct comedi_insnlist __user *)arg,
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file);
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break;
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case COMEDI_INSN:
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rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
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file);
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break;
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case COMEDI_POLL:
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rc = do_poll_ioctl(dev, arg, file);
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break;
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default:
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rc = -ENOTTY;
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break;
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}
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done:
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mutex_unlock(&dev->mutex);
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return rc;
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}
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/*
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COMEDI_DEVCONFIG
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device config ioctl
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arg:
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pointer to devconfig structure
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reads:
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devconfig structure at arg
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writes:
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none
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*/
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static int do_devconfig_ioctl(struct comedi_device *dev,
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struct comedi_devconfig __user *arg)
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{
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struct comedi_devconfig it;
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int ret;
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unsigned char *aux_data = NULL;
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int aux_len;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (arg == NULL) {
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if (is_device_busy(dev))
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return -EBUSY;
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if (dev->attached) {
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struct module *driver_module = dev->driver->module;
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comedi_device_detach(dev);
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module_put(driver_module);
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}
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return 0;
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}
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if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig)))
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return -EFAULT;
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it.board_name[COMEDI_NAMELEN - 1] = 0;
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if (comedi_aux_data(it.options, 0) &&
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it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
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int bit_shift;
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aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH];
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if (aux_len < 0)
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return -EFAULT;
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aux_data = vmalloc(aux_len);
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if (!aux_data)
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return -ENOMEM;
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if (copy_from_user(aux_data,
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comedi_aux_data(it.options, 0), aux_len)) {
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vfree(aux_data);
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return -EFAULT;
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}
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it.options[COMEDI_DEVCONF_AUX_DATA_LO] =
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(unsigned long)aux_data;
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if (sizeof(void *) > sizeof(int)) {
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bit_shift = sizeof(int) * 8;
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it.options[COMEDI_DEVCONF_AUX_DATA_HI] =
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((unsigned long)aux_data) >> bit_shift;
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} else
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it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0;
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}
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ret = comedi_device_attach(dev, &it);
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if (ret == 0) {
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if (!try_module_get(dev->driver->module)) {
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comedi_device_detach(dev);
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return -ENOSYS;
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}
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}
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if (aux_data)
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vfree(aux_data);
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return ret;
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}
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/*
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COMEDI_BUFCONFIG
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buffer configuration ioctl
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arg:
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pointer to bufconfig structure
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reads:
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bufconfig at arg
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writes:
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modified bufconfig at arg
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*/
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static int do_bufconfig_ioctl(struct comedi_device *dev,
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struct comedi_bufconfig __user *arg)
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{
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struct comedi_bufconfig bc;
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struct comedi_async *async;
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struct comedi_subdevice *s;
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int retval = 0;
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if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig)))
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return -EFAULT;
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if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
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return -EINVAL;
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s = dev->subdevices + bc.subdevice;
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async = s->async;
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if (!async) {
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DPRINTK("subdevice does not have async capability\n");
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bc.size = 0;
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bc.maximum_size = 0;
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goto copyback;
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}
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if (bc.maximum_size) {
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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async->max_bufsize = bc.maximum_size;
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}
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if (bc.size) {
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retval = resize_async_buffer(dev, s, async, bc.size);
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if (retval < 0)
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return retval;
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}
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bc.size = async->prealloc_bufsz;
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bc.maximum_size = async->max_bufsize;
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copyback:
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if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig)))
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return -EFAULT;
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return 0;
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}
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/*
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COMEDI_DEVINFO
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device info ioctl
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arg:
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pointer to devinfo structure
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reads:
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none
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writes:
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devinfo structure
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*/
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static int do_devinfo_ioctl(struct comedi_device *dev,
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struct comedi_devinfo __user *arg,
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struct file *file)
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{
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struct comedi_devinfo devinfo;
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const unsigned minor = iminor(file->f_dentry->d_inode);
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struct comedi_device_file_info *dev_file_info =
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comedi_get_device_file_info(minor);
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struct comedi_subdevice *read_subdev =
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comedi_get_read_subdevice(dev_file_info);
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struct comedi_subdevice *write_subdev =
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comedi_get_write_subdevice(dev_file_info);
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memset(&devinfo, 0, sizeof(devinfo));
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/* fill devinfo structure */
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devinfo.version_code = COMEDI_VERSION_CODE;
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devinfo.n_subdevs = dev->n_subdevices;
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memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
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memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
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if (read_subdev)
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devinfo.read_subdevice = read_subdev - dev->subdevices;
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else
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devinfo.read_subdevice = -1;
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if (write_subdev)
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devinfo.write_subdevice = write_subdev - dev->subdevices;
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else
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devinfo.write_subdevice = -1;
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if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo)))
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return -EFAULT;
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return 0;
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}
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/*
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COMEDI_SUBDINFO
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subdevice info ioctl
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arg:
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pointer to array of subdevice info structures
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reads:
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none
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writes:
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array of subdevice info structures at arg
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*/
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static int do_subdinfo_ioctl(struct comedi_device *dev,
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struct comedi_subdinfo __user *arg, void *file)
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{
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int ret, i;
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struct comedi_subdinfo *tmp, *us;
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struct comedi_subdevice *s;
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tmp =
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kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo),
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GFP_KERNEL);
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if (!tmp)
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return -ENOMEM;
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/* fill subdinfo structs */
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for (i = 0; i < dev->n_subdevices; i++) {
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s = dev->subdevices + i;
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us = tmp + i;
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us->type = s->type;
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us->n_chan = s->n_chan;
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us->subd_flags = s->subdev_flags;
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if (comedi_get_subdevice_runflags(s) & SRF_RUNNING)
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us->subd_flags |= SDF_RUNNING;
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#define TIMER_nanosec 5 /* backwards compatibility */
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us->timer_type = TIMER_nanosec;
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us->len_chanlist = s->len_chanlist;
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us->maxdata = s->maxdata;
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if (s->range_table) {
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us->range_type =
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(i << 24) | (0 << 16) | (s->range_table->length);
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} else {
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us->range_type = 0; /* XXX */
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}
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us->flags = s->flags;
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|
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if (s->busy)
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us->subd_flags |= SDF_BUSY;
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if (s->busy == file)
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us->subd_flags |= SDF_BUSY_OWNER;
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if (s->lock)
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us->subd_flags |= SDF_LOCKED;
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if (s->lock == file)
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us->subd_flags |= SDF_LOCK_OWNER;
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if (!s->maxdata && s->maxdata_list)
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us->subd_flags |= SDF_MAXDATA;
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if (s->flaglist)
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us->subd_flags |= SDF_FLAGS;
|
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if (s->range_table_list)
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us->subd_flags |= SDF_RANGETYPE;
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if (s->do_cmd)
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us->subd_flags |= SDF_CMD;
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|
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if (s->insn_bits != &insn_inval)
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us->insn_bits_support = COMEDI_SUPPORTED;
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else
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us->insn_bits_support = COMEDI_UNSUPPORTED;
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|
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us->settling_time_0 = s->settling_time_0;
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}
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|
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ret = copy_to_user(arg, tmp,
|
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dev->n_subdevices * sizeof(struct comedi_subdinfo));
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|
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kfree(tmp);
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|
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return ret ? -EFAULT : 0;
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}
|
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|
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/*
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COMEDI_CHANINFO
|
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subdevice info ioctl
|
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|
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arg:
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pointer to chaninfo structure
|
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|
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reads:
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chaninfo structure at arg
|
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|
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writes:
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arrays at elements of chaninfo structure
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*/
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static int do_chaninfo_ioctl(struct comedi_device *dev,
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struct comedi_chaninfo __user *arg)
|
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{
|
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struct comedi_subdevice *s;
|
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struct comedi_chaninfo it;
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|
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if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo)))
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return -EFAULT;
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|
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if (it.subdev >= dev->n_subdevices)
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return -EINVAL;
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s = dev->subdevices + it.subdev;
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|
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if (it.maxdata_list) {
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if (s->maxdata || !s->maxdata_list)
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return -EINVAL;
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if (copy_to_user(it.maxdata_list, s->maxdata_list,
|
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s->n_chan * sizeof(unsigned int)))
|
|
return -EFAULT;
|
|
}
|
|
|
|
if (it.flaglist) {
|
|
if (!s->flaglist)
|
|
return -EINVAL;
|
|
if (copy_to_user(it.flaglist, s->flaglist,
|
|
s->n_chan * sizeof(unsigned int)))
|
|
return -EFAULT;
|
|
}
|
|
|
|
if (it.rangelist) {
|
|
int i;
|
|
|
|
if (!s->range_table_list)
|
|
return -EINVAL;
|
|
for (i = 0; i < s->n_chan; i++) {
|
|
int x;
|
|
|
|
x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
|
|
(s->range_table_list[i]->length);
|
|
put_user(x, it.rangelist + i);
|
|
}
|
|
#if 0
|
|
if (copy_to_user(it.rangelist, s->range_type_list,
|
|
s->n_chan * sizeof(unsigned int)))
|
|
return -EFAULT;
|
|
#endif
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
COMEDI_BUFINFO
|
|
buffer information ioctl
|
|
|
|
arg:
|
|
pointer to bufinfo structure
|
|
|
|
reads:
|
|
bufinfo at arg
|
|
|
|
writes:
|
|
modified bufinfo at arg
|
|
|
|
*/
|
|
static int do_bufinfo_ioctl(struct comedi_device *dev,
|
|
struct comedi_bufinfo __user *arg, void *file)
|
|
{
|
|
struct comedi_bufinfo bi;
|
|
struct comedi_subdevice *s;
|
|
struct comedi_async *async;
|
|
|
|
if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo)))
|
|
return -EFAULT;
|
|
|
|
if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
|
|
return -EINVAL;
|
|
|
|
s = dev->subdevices + bi.subdevice;
|
|
|
|
if (s->lock && s->lock != file)
|
|
return -EACCES;
|
|
|
|
async = s->async;
|
|
|
|
if (!async) {
|
|
DPRINTK("subdevice does not have async capability\n");
|
|
bi.buf_write_ptr = 0;
|
|
bi.buf_read_ptr = 0;
|
|
bi.buf_write_count = 0;
|
|
bi.buf_read_count = 0;
|
|
bi.bytes_read = 0;
|
|
bi.bytes_written = 0;
|
|
goto copyback;
|
|
}
|
|
if (!s->busy) {
|
|
bi.bytes_read = 0;
|
|
bi.bytes_written = 0;
|
|
goto copyback_position;
|
|
}
|
|
if (s->busy != file)
|
|
return -EACCES;
|
|
|
|
if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
|
|
bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
|
|
comedi_buf_read_free(async, bi.bytes_read);
|
|
|
|
if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR |
|
|
SRF_RUNNING))
|
|
&& async->buf_write_count == async->buf_read_count) {
|
|
do_become_nonbusy(dev, s);
|
|
}
|
|
}
|
|
|
|
if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
|
|
bi.bytes_written =
|
|
comedi_buf_write_alloc(async, bi.bytes_written);
|
|
comedi_buf_write_free(async, bi.bytes_written);
|
|
}
|
|
|
|
copyback_position:
|
|
bi.buf_write_count = async->buf_write_count;
|
|
bi.buf_write_ptr = async->buf_write_ptr;
|
|
bi.buf_read_count = async->buf_read_count;
|
|
bi.buf_read_ptr = async->buf_read_ptr;
|
|
|
|
copyback:
|
|
if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
|
|
unsigned int *data, void *file);
|
|
/*
|
|
* COMEDI_INSNLIST
|
|
* synchronous instructions
|
|
*
|
|
* arg:
|
|
* pointer to sync cmd structure
|
|
*
|
|
* reads:
|
|
* sync cmd struct at arg
|
|
* instruction list
|
|
* data (for writes)
|
|
*
|
|
* writes:
|
|
* data (for reads)
|
|
*/
|
|
/* arbitrary limits */
|
|
#define MAX_SAMPLES 256
|
|
static int do_insnlist_ioctl(struct comedi_device *dev,
|
|
struct comedi_insnlist __user *arg, void *file)
|
|
{
|
|
struct comedi_insnlist insnlist;
|
|
struct comedi_insn *insns = NULL;
|
|
unsigned int *data = NULL;
|
|
int i = 0;
|
|
int ret = 0;
|
|
|
|
if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist)))
|
|
return -EFAULT;
|
|
|
|
data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
|
|
if (!data) {
|
|
DPRINTK("kmalloc failed\n");
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
insns =
|
|
kmalloc(sizeof(struct comedi_insn) * insnlist.n_insns, GFP_KERNEL);
|
|
if (!insns) {
|
|
DPRINTK("kmalloc failed\n");
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
if (copy_from_user(insns, insnlist.insns,
|
|
sizeof(struct comedi_insn) * insnlist.n_insns)) {
|
|
DPRINTK("copy_from_user failed\n");
|
|
ret = -EFAULT;
|
|
goto error;
|
|
}
|
|
|
|
for (i = 0; i < insnlist.n_insns; i++) {
|
|
if (insns[i].n > MAX_SAMPLES) {
|
|
DPRINTK("number of samples too large\n");
|
|
ret = -EINVAL;
|
|
goto error;
|
|
}
|
|
if (insns[i].insn & INSN_MASK_WRITE) {
|
|
if (copy_from_user(data, insns[i].data,
|
|
insns[i].n * sizeof(unsigned int))) {
|
|
DPRINTK("copy_from_user failed\n");
|
|
ret = -EFAULT;
|
|
goto error;
|
|
}
|
|
}
|
|
ret = parse_insn(dev, insns + i, data, file);
|
|
if (ret < 0)
|
|
goto error;
|
|
if (insns[i].insn & INSN_MASK_READ) {
|
|
if (copy_to_user(insns[i].data, data,
|
|
insns[i].n * sizeof(unsigned int))) {
|
|
DPRINTK("copy_to_user failed\n");
|
|
ret = -EFAULT;
|
|
goto error;
|
|
}
|
|
}
|
|
if (need_resched())
|
|
schedule();
|
|
}
|
|
|
|
error:
|
|
kfree(insns);
|
|
kfree(data);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
return i;
|
|
}
|
|
|
|
static int check_insn_config_length(struct comedi_insn *insn,
|
|
unsigned int *data)
|
|
{
|
|
if (insn->n < 1)
|
|
return -EINVAL;
|
|
|
|
switch (data[0]) {
|
|
case INSN_CONFIG_DIO_OUTPUT:
|
|
case INSN_CONFIG_DIO_INPUT:
|
|
case INSN_CONFIG_DISARM:
|
|
case INSN_CONFIG_RESET:
|
|
if (insn->n == 1)
|
|
return 0;
|
|
break;
|
|
case INSN_CONFIG_ARM:
|
|
case INSN_CONFIG_DIO_QUERY:
|
|
case INSN_CONFIG_BLOCK_SIZE:
|
|
case INSN_CONFIG_FILTER:
|
|
case INSN_CONFIG_SERIAL_CLOCK:
|
|
case INSN_CONFIG_BIDIRECTIONAL_DATA:
|
|
case INSN_CONFIG_ALT_SOURCE:
|
|
case INSN_CONFIG_SET_COUNTER_MODE:
|
|
case INSN_CONFIG_8254_READ_STATUS:
|
|
case INSN_CONFIG_SET_ROUTING:
|
|
case INSN_CONFIG_GET_ROUTING:
|
|
case INSN_CONFIG_GET_PWM_STATUS:
|
|
case INSN_CONFIG_PWM_SET_PERIOD:
|
|
case INSN_CONFIG_PWM_GET_PERIOD:
|
|
if (insn->n == 2)
|
|
return 0;
|
|
break;
|
|
case INSN_CONFIG_SET_GATE_SRC:
|
|
case INSN_CONFIG_GET_GATE_SRC:
|
|
case INSN_CONFIG_SET_CLOCK_SRC:
|
|
case INSN_CONFIG_GET_CLOCK_SRC:
|
|
case INSN_CONFIG_SET_OTHER_SRC:
|
|
case INSN_CONFIG_GET_COUNTER_STATUS:
|
|
case INSN_CONFIG_PWM_SET_H_BRIDGE:
|
|
case INSN_CONFIG_PWM_GET_H_BRIDGE:
|
|
case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
|
|
if (insn->n == 3)
|
|
return 0;
|
|
break;
|
|
case INSN_CONFIG_PWM_OUTPUT:
|
|
case INSN_CONFIG_ANALOG_TRIG:
|
|
if (insn->n == 5)
|
|
return 0;
|
|
break;
|
|
/* by default we allow the insn since we don't have checks for
|
|
* all possible cases yet */
|
|
default:
|
|
printk(KERN_WARNING
|
|
"comedi: no check for data length of config insn id "
|
|
"%i is implemented.\n"
|
|
" Add a check to %s in %s.\n"
|
|
" Assuming n=%i is correct.\n", data[0], __func__,
|
|
__FILE__, insn->n);
|
|
return 0;
|
|
break;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
|
|
unsigned int *data, void *file)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
int ret = 0;
|
|
int i;
|
|
|
|
if (insn->insn & INSN_MASK_SPECIAL) {
|
|
/* a non-subdevice instruction */
|
|
|
|
switch (insn->insn) {
|
|
case INSN_GTOD:
|
|
{
|
|
struct timeval tv;
|
|
|
|
if (insn->n != 2) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
do_gettimeofday(&tv);
|
|
data[0] = tv.tv_sec;
|
|
data[1] = tv.tv_usec;
|
|
ret = 2;
|
|
|
|
break;
|
|
}
|
|
case INSN_WAIT:
|
|
if (insn->n != 1 || data[0] >= 100000) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
udelay(data[0] / 1000);
|
|
ret = 1;
|
|
break;
|
|
case INSN_INTTRIG:
|
|
if (insn->n != 1) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (insn->subdev >= dev->n_subdevices) {
|
|
DPRINTK("%d not usable subdevice\n",
|
|
insn->subdev);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
s = dev->subdevices + insn->subdev;
|
|
if (!s->async) {
|
|
DPRINTK("no async\n");
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (!s->async->inttrig) {
|
|
DPRINTK("no inttrig\n");
|
|
ret = -EAGAIN;
|
|
break;
|
|
}
|
|
ret = s->async->inttrig(dev, s, insn->data[0]);
|
|
if (ret >= 0)
|
|
ret = 1;
|
|
break;
|
|
default:
|
|
DPRINTK("invalid insn\n");
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
} else {
|
|
/* a subdevice instruction */
|
|
unsigned int maxdata;
|
|
|
|
if (insn->subdev >= dev->n_subdevices) {
|
|
DPRINTK("subdevice %d out of range\n", insn->subdev);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
s = dev->subdevices + insn->subdev;
|
|
|
|
if (s->type == COMEDI_SUBD_UNUSED) {
|
|
DPRINTK("%d not usable subdevice\n", insn->subdev);
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/* are we locked? (ioctl lock) */
|
|
if (s->lock && s->lock != file) {
|
|
DPRINTK("device locked\n");
|
|
ret = -EACCES;
|
|
goto out;
|
|
}
|
|
|
|
ret = comedi_check_chanlist(s, 1, &insn->chanspec);
|
|
if (ret < 0) {
|
|
ret = -EINVAL;
|
|
DPRINTK("bad chanspec\n");
|
|
goto out;
|
|
}
|
|
|
|
if (s->busy) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
/* This looks arbitrary. It is. */
|
|
s->busy = &parse_insn;
|
|
switch (insn->insn) {
|
|
case INSN_READ:
|
|
ret = s->insn_read(dev, s, insn, data);
|
|
break;
|
|
case INSN_WRITE:
|
|
maxdata = s->maxdata_list
|
|
? s->maxdata_list[CR_CHAN(insn->chanspec)]
|
|
: s->maxdata;
|
|
for (i = 0; i < insn->n; ++i) {
|
|
if (data[i] > maxdata) {
|
|
ret = -EINVAL;
|
|
DPRINTK("bad data value(s)\n");
|
|
break;
|
|
}
|
|
}
|
|
if (ret == 0)
|
|
ret = s->insn_write(dev, s, insn, data);
|
|
break;
|
|
case INSN_BITS:
|
|
if (insn->n != 2) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
ret = s->insn_bits(dev, s, insn, data);
|
|
break;
|
|
case INSN_CONFIG:
|
|
ret = check_insn_config_length(insn, data);
|
|
if (ret)
|
|
break;
|
|
ret = s->insn_config(dev, s, insn, data);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
s->busy = NULL;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* COMEDI_INSN
|
|
* synchronous instructions
|
|
*
|
|
* arg:
|
|
* pointer to insn
|
|
*
|
|
* reads:
|
|
* struct comedi_insn struct at arg
|
|
* data (for writes)
|
|
*
|
|
* writes:
|
|
* data (for reads)
|
|
*/
|
|
static int do_insn_ioctl(struct comedi_device *dev,
|
|
struct comedi_insn __user *arg, void *file)
|
|
{
|
|
struct comedi_insn insn;
|
|
unsigned int *data = NULL;
|
|
int ret = 0;
|
|
|
|
data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
|
|
if (!data) {
|
|
ret = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) {
|
|
ret = -EFAULT;
|
|
goto error;
|
|
}
|
|
|
|
/* This is where the behavior of insn and insnlist deviate. */
|
|
if (insn.n > MAX_SAMPLES)
|
|
insn.n = MAX_SAMPLES;
|
|
if (insn.insn & INSN_MASK_WRITE) {
|
|
if (copy_from_user(data,
|
|
insn.data,
|
|
insn.n * sizeof(unsigned int))) {
|
|
ret = -EFAULT;
|
|
goto error;
|
|
}
|
|
}
|
|
ret = parse_insn(dev, &insn, data, file);
|
|
if (ret < 0)
|
|
goto error;
|
|
if (insn.insn & INSN_MASK_READ) {
|
|
if (copy_to_user(insn.data,
|
|
data,
|
|
insn.n * sizeof(unsigned int))) {
|
|
ret = -EFAULT;
|
|
goto error;
|
|
}
|
|
}
|
|
ret = insn.n;
|
|
|
|
error:
|
|
kfree(data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
|
|
unsigned mask, unsigned bits)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&s->spin_lock, flags);
|
|
s->runflags &= ~mask;
|
|
s->runflags |= (bits & mask);
|
|
spin_unlock_irqrestore(&s->spin_lock, flags);
|
|
}
|
|
|
|
static int do_cmd_ioctl(struct comedi_device *dev,
|
|
struct comedi_cmd __user *cmd, void *file)
|
|
{
|
|
struct comedi_cmd user_cmd;
|
|
struct comedi_subdevice *s;
|
|
struct comedi_async *async;
|
|
int ret = 0;
|
|
unsigned int __user *chanlist_saver = NULL;
|
|
|
|
if (copy_from_user(&user_cmd, cmd, sizeof(struct comedi_cmd))) {
|
|
DPRINTK("bad cmd address\n");
|
|
return -EFAULT;
|
|
}
|
|
/* save user's chanlist pointer so it can be restored later */
|
|
chanlist_saver = user_cmd.chanlist;
|
|
|
|
if (user_cmd.subdev >= dev->n_subdevices) {
|
|
DPRINTK("%d no such subdevice\n", user_cmd.subdev);
|
|
return -ENODEV;
|
|
}
|
|
|
|
s = dev->subdevices + user_cmd.subdev;
|
|
async = s->async;
|
|
|
|
if (s->type == COMEDI_SUBD_UNUSED) {
|
|
DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
|
|
return -EIO;
|
|
}
|
|
|
|
if (!s->do_cmd || !s->do_cmdtest || !s->async) {
|
|
DPRINTK("subdevice %i does not support commands\n",
|
|
user_cmd.subdev);
|
|
return -EIO;
|
|
}
|
|
|
|
/* are we locked? (ioctl lock) */
|
|
if (s->lock && s->lock != file) {
|
|
DPRINTK("subdevice locked\n");
|
|
return -EACCES;
|
|
}
|
|
|
|
/* are we busy? */
|
|
if (s->busy) {
|
|
DPRINTK("subdevice busy\n");
|
|
return -EBUSY;
|
|
}
|
|
s->busy = file;
|
|
|
|
/* make sure channel/gain list isn't too long */
|
|
if (user_cmd.chanlist_len > s->len_chanlist) {
|
|
DPRINTK("channel/gain list too long %u > %d\n",
|
|
user_cmd.chanlist_len, s->len_chanlist);
|
|
ret = -EINVAL;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* make sure channel/gain list isn't too short */
|
|
if (user_cmd.chanlist_len < 1) {
|
|
DPRINTK("channel/gain list too short %u < 1\n",
|
|
user_cmd.chanlist_len);
|
|
ret = -EINVAL;
|
|
goto cleanup;
|
|
}
|
|
|
|
kfree(async->cmd.chanlist);
|
|
async->cmd = user_cmd;
|
|
async->cmd.data = NULL;
|
|
/* load channel/gain list */
|
|
async->cmd.chanlist =
|
|
kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
|
|
if (!async->cmd.chanlist) {
|
|
DPRINTK("allocation failed\n");
|
|
ret = -ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist,
|
|
async->cmd.chanlist_len * sizeof(int))) {
|
|
DPRINTK("fault reading chanlist\n");
|
|
ret = -EFAULT;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* make sure each element in channel/gain list is valid */
|
|
ret = comedi_check_chanlist(s,
|
|
async->cmd.chanlist_len,
|
|
async->cmd.chanlist);
|
|
if (ret < 0) {
|
|
DPRINTK("bad chanlist\n");
|
|
goto cleanup;
|
|
}
|
|
|
|
ret = s->do_cmdtest(dev, s, &async->cmd);
|
|
|
|
if (async->cmd.flags & TRIG_BOGUS || ret) {
|
|
DPRINTK("test returned %d\n", ret);
|
|
user_cmd = async->cmd;
|
|
/* restore chanlist pointer before copying back */
|
|
user_cmd.chanlist = chanlist_saver;
|
|
user_cmd.data = NULL;
|
|
if (copy_to_user(cmd, &user_cmd, sizeof(struct comedi_cmd))) {
|
|
DPRINTK("fault writing cmd\n");
|
|
ret = -EFAULT;
|
|
goto cleanup;
|
|
}
|
|
ret = -EAGAIN;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (!async->prealloc_bufsz) {
|
|
ret = -ENOMEM;
|
|
DPRINTK("no buffer (?)\n");
|
|
goto cleanup;
|
|
}
|
|
|
|
comedi_reset_async_buf(async);
|
|
|
|
async->cb_mask =
|
|
COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
|
|
COMEDI_CB_OVERFLOW;
|
|
if (async->cmd.flags & TRIG_WAKE_EOS)
|
|
async->cb_mask |= COMEDI_CB_EOS;
|
|
|
|
comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
|
|
|
|
ret = s->do_cmd(dev, s);
|
|
if (ret == 0)
|
|
return 0;
|
|
|
|
cleanup:
|
|
do_become_nonbusy(dev, s);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
COMEDI_CMDTEST
|
|
command testing ioctl
|
|
|
|
arg:
|
|
pointer to cmd structure
|
|
|
|
reads:
|
|
cmd structure at arg
|
|
channel/range list
|
|
|
|
writes:
|
|
modified cmd structure at arg
|
|
|
|
*/
|
|
static int do_cmdtest_ioctl(struct comedi_device *dev,
|
|
struct comedi_cmd __user *arg, void *file)
|
|
{
|
|
struct comedi_cmd user_cmd;
|
|
struct comedi_subdevice *s;
|
|
int ret = 0;
|
|
unsigned int *chanlist = NULL;
|
|
unsigned int __user *chanlist_saver = NULL;
|
|
|
|
if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) {
|
|
DPRINTK("bad cmd address\n");
|
|
return -EFAULT;
|
|
}
|
|
/* save user's chanlist pointer so it can be restored later */
|
|
chanlist_saver = user_cmd.chanlist;
|
|
|
|
if (user_cmd.subdev >= dev->n_subdevices) {
|
|
DPRINTK("%d no such subdevice\n", user_cmd.subdev);
|
|
return -ENODEV;
|
|
}
|
|
|
|
s = dev->subdevices + user_cmd.subdev;
|
|
if (s->type == COMEDI_SUBD_UNUSED) {
|
|
DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
|
|
return -EIO;
|
|
}
|
|
|
|
if (!s->do_cmd || !s->do_cmdtest) {
|
|
DPRINTK("subdevice %i does not support commands\n",
|
|
user_cmd.subdev);
|
|
return -EIO;
|
|
}
|
|
|
|
/* make sure channel/gain list isn't too long */
|
|
if (user_cmd.chanlist_len > s->len_chanlist) {
|
|
DPRINTK("channel/gain list too long %d > %d\n",
|
|
user_cmd.chanlist_len, s->len_chanlist);
|
|
ret = -EINVAL;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* load channel/gain list */
|
|
if (user_cmd.chanlist) {
|
|
chanlist =
|
|
kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL);
|
|
if (!chanlist) {
|
|
DPRINTK("allocation failed\n");
|
|
ret = -ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
|
|
if (copy_from_user(chanlist, user_cmd.chanlist,
|
|
user_cmd.chanlist_len * sizeof(int))) {
|
|
DPRINTK("fault reading chanlist\n");
|
|
ret = -EFAULT;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* make sure each element in channel/gain list is valid */
|
|
ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist);
|
|
if (ret < 0) {
|
|
DPRINTK("bad chanlist\n");
|
|
goto cleanup;
|
|
}
|
|
|
|
user_cmd.chanlist = chanlist;
|
|
}
|
|
|
|
ret = s->do_cmdtest(dev, s, &user_cmd);
|
|
|
|
/* restore chanlist pointer before copying back */
|
|
user_cmd.chanlist = chanlist_saver;
|
|
|
|
if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) {
|
|
DPRINTK("bad cmd address\n");
|
|
ret = -EFAULT;
|
|
goto cleanup;
|
|
}
|
|
cleanup:
|
|
kfree(chanlist);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
COMEDI_LOCK
|
|
lock subdevice
|
|
|
|
arg:
|
|
subdevice number
|
|
|
|
reads:
|
|
none
|
|
|
|
writes:
|
|
none
|
|
|
|
*/
|
|
|
|
static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
|
|
void *file)
|
|
{
|
|
int ret = 0;
|
|
unsigned long flags;
|
|
struct comedi_subdevice *s;
|
|
|
|
if (arg >= dev->n_subdevices)
|
|
return -EINVAL;
|
|
s = dev->subdevices + arg;
|
|
|
|
spin_lock_irqsave(&s->spin_lock, flags);
|
|
if (s->busy || s->lock)
|
|
ret = -EBUSY;
|
|
else
|
|
s->lock = file;
|
|
spin_unlock_irqrestore(&s->spin_lock, flags);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
#if 0
|
|
if (s->lock_f)
|
|
ret = s->lock_f(dev, s);
|
|
#endif
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
COMEDI_UNLOCK
|
|
unlock subdevice
|
|
|
|
arg:
|
|
subdevice number
|
|
|
|
reads:
|
|
none
|
|
|
|
writes:
|
|
none
|
|
|
|
This function isn't protected by the semaphore, since
|
|
we already own the lock.
|
|
*/
|
|
static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
|
|
void *file)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
|
|
if (arg >= dev->n_subdevices)
|
|
return -EINVAL;
|
|
s = dev->subdevices + arg;
|
|
|
|
if (s->busy)
|
|
return -EBUSY;
|
|
|
|
if (s->lock && s->lock != file)
|
|
return -EACCES;
|
|
|
|
if (s->lock == file) {
|
|
#if 0
|
|
if (s->unlock)
|
|
s->unlock(dev, s);
|
|
#endif
|
|
|
|
s->lock = NULL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
COMEDI_CANCEL
|
|
cancel acquisition ioctl
|
|
|
|
arg:
|
|
subdevice number
|
|
|
|
reads:
|
|
nothing
|
|
|
|
writes:
|
|
nothing
|
|
|
|
*/
|
|
static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
|
|
void *file)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
|
|
if (arg >= dev->n_subdevices)
|
|
return -EINVAL;
|
|
s = dev->subdevices + arg;
|
|
if (s->async == NULL)
|
|
return -EINVAL;
|
|
|
|
if (s->lock && s->lock != file)
|
|
return -EACCES;
|
|
|
|
if (!s->busy)
|
|
return 0;
|
|
|
|
if (s->busy != file)
|
|
return -EBUSY;
|
|
|
|
return do_cancel(dev, s);
|
|
}
|
|
|
|
/*
|
|
COMEDI_POLL ioctl
|
|
instructs driver to synchronize buffers
|
|
|
|
arg:
|
|
subdevice number
|
|
|
|
reads:
|
|
nothing
|
|
|
|
writes:
|
|
nothing
|
|
|
|
*/
|
|
static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
|
|
void *file)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
|
|
if (arg >= dev->n_subdevices)
|
|
return -EINVAL;
|
|
s = dev->subdevices + arg;
|
|
|
|
if (s->lock && s->lock != file)
|
|
return -EACCES;
|
|
|
|
if (!s->busy)
|
|
return 0;
|
|
|
|
if (s->busy != file)
|
|
return -EBUSY;
|
|
|
|
if (s->poll)
|
|
return s->poll(dev, s);
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
|
|
{
|
|
int ret = 0;
|
|
|
|
if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel)
|
|
ret = s->cancel(dev, s);
|
|
|
|
do_become_nonbusy(dev, s);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void comedi_unmap(struct vm_area_struct *area)
|
|
{
|
|
struct comedi_async *async;
|
|
struct comedi_device *dev;
|
|
|
|
async = area->vm_private_data;
|
|
dev = async->subdevice->device;
|
|
|
|
mutex_lock(&dev->mutex);
|
|
async->mmap_count--;
|
|
mutex_unlock(&dev->mutex);
|
|
}
|
|
|
|
static struct vm_operations_struct comedi_vm_ops = {
|
|
.close = comedi_unmap,
|
|
};
|
|
|
|
static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
const unsigned minor = iminor(file->f_dentry->d_inode);
|
|
struct comedi_device_file_info *dev_file_info =
|
|
comedi_get_device_file_info(minor);
|
|
struct comedi_device *dev = dev_file_info->device;
|
|
struct comedi_async *async = NULL;
|
|
unsigned long start = vma->vm_start;
|
|
unsigned long size;
|
|
int n_pages;
|
|
int i;
|
|
int retval;
|
|
struct comedi_subdevice *s;
|
|
|
|
mutex_lock(&dev->mutex);
|
|
if (!dev->attached) {
|
|
DPRINTK("no driver configured on comedi%i\n", dev->minor);
|
|
retval = -ENODEV;
|
|
goto done;
|
|
}
|
|
if (vma->vm_flags & VM_WRITE)
|
|
s = comedi_get_write_subdevice(dev_file_info);
|
|
else
|
|
s = comedi_get_read_subdevice(dev_file_info);
|
|
|
|
if (s == NULL) {
|
|
retval = -EINVAL;
|
|
goto done;
|
|
}
|
|
async = s->async;
|
|
if (async == NULL) {
|
|
retval = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
if (vma->vm_pgoff != 0) {
|
|
DPRINTK("comedi: mmap() offset must be 0.\n");
|
|
retval = -EINVAL;
|
|
goto done;
|
|
}
|
|
|
|
size = vma->vm_end - vma->vm_start;
|
|
if (size > async->prealloc_bufsz) {
|
|
retval = -EFAULT;
|
|
goto done;
|
|
}
|
|
if (size & (~PAGE_MASK)) {
|
|
retval = -EFAULT;
|
|
goto done;
|
|
}
|
|
|
|
n_pages = size >> PAGE_SHIFT;
|
|
for (i = 0; i < n_pages; ++i) {
|
|
if (remap_pfn_range(vma, start,
|
|
page_to_pfn(virt_to_page
|
|
(async->buf_page_list
|
|
[i].virt_addr)), PAGE_SIZE,
|
|
PAGE_SHARED)) {
|
|
retval = -EAGAIN;
|
|
goto done;
|
|
}
|
|
start += PAGE_SIZE;
|
|
}
|
|
|
|
vma->vm_ops = &comedi_vm_ops;
|
|
vma->vm_private_data = async;
|
|
|
|
async->mmap_count++;
|
|
|
|
retval = 0;
|
|
done:
|
|
mutex_unlock(&dev->mutex);
|
|
return retval;
|
|
}
|
|
|
|
static unsigned int comedi_poll(struct file *file, poll_table * wait)
|
|
{
|
|
unsigned int mask = 0;
|
|
const unsigned minor = iminor(file->f_dentry->d_inode);
|
|
struct comedi_device_file_info *dev_file_info =
|
|
comedi_get_device_file_info(minor);
|
|
struct comedi_device *dev = dev_file_info->device;
|
|
struct comedi_subdevice *read_subdev;
|
|
struct comedi_subdevice *write_subdev;
|
|
|
|
mutex_lock(&dev->mutex);
|
|
if (!dev->attached) {
|
|
DPRINTK("no driver configured on comedi%i\n", dev->minor);
|
|
mutex_unlock(&dev->mutex);
|
|
return 0;
|
|
}
|
|
|
|
mask = 0;
|
|
read_subdev = comedi_get_read_subdevice(dev_file_info);
|
|
if (read_subdev) {
|
|
poll_wait(file, &read_subdev->async->wait_head, wait);
|
|
if (!read_subdev->busy
|
|
|| comedi_buf_read_n_available(read_subdev->async) > 0
|
|
|| !(comedi_get_subdevice_runflags(read_subdev) &
|
|
SRF_RUNNING)) {
|
|
mask |= POLLIN | POLLRDNORM;
|
|
}
|
|
}
|
|
write_subdev = comedi_get_write_subdevice(dev_file_info);
|
|
if (write_subdev) {
|
|
poll_wait(file, &write_subdev->async->wait_head, wait);
|
|
comedi_buf_write_alloc(write_subdev->async,
|
|
write_subdev->async->prealloc_bufsz);
|
|
if (!write_subdev->busy
|
|
|| !(comedi_get_subdevice_runflags(write_subdev) &
|
|
SRF_RUNNING)
|
|
|| comedi_buf_write_n_allocated(write_subdev->async) >=
|
|
bytes_per_sample(write_subdev->async->subdevice)) {
|
|
mask |= POLLOUT | POLLWRNORM;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&dev->mutex);
|
|
return mask;
|
|
}
|
|
|
|
static ssize_t comedi_write(struct file *file, const char __user *buf,
|
|
size_t nbytes, loff_t *offset)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
struct comedi_async *async;
|
|
int n, m, count = 0, retval = 0;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
const unsigned minor = iminor(file->f_dentry->d_inode);
|
|
struct comedi_device_file_info *dev_file_info =
|
|
comedi_get_device_file_info(minor);
|
|
struct comedi_device *dev = dev_file_info->device;
|
|
|
|
if (!dev->attached) {
|
|
DPRINTK("no driver configured on comedi%i\n", dev->minor);
|
|
retval = -ENODEV;
|
|
goto done;
|
|
}
|
|
|
|
s = comedi_get_write_subdevice(dev_file_info);
|
|
if (s == NULL) {
|
|
retval = -EIO;
|
|
goto done;
|
|
}
|
|
async = s->async;
|
|
|
|
if (!nbytes) {
|
|
retval = 0;
|
|
goto done;
|
|
}
|
|
if (!s->busy) {
|
|
retval = 0;
|
|
goto done;
|
|
}
|
|
if (s->busy != file) {
|
|
retval = -EACCES;
|
|
goto done;
|
|
}
|
|
add_wait_queue(&async->wait_head, &wait);
|
|
while (nbytes > 0 && !retval) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
|
|
if (count == 0) {
|
|
if (comedi_get_subdevice_runflags(s) &
|
|
SRF_ERROR) {
|
|
retval = -EPIPE;
|
|
} else {
|
|
retval = 0;
|
|
}
|
|
do_become_nonbusy(dev, s);
|
|
}
|
|
break;
|
|
}
|
|
|
|
n = nbytes;
|
|
|
|
m = n;
|
|
if (async->buf_write_ptr + m > async->prealloc_bufsz)
|
|
m = async->prealloc_bufsz - async->buf_write_ptr;
|
|
comedi_buf_write_alloc(async, async->prealloc_bufsz);
|
|
if (m > comedi_buf_write_n_allocated(async))
|
|
m = comedi_buf_write_n_allocated(async);
|
|
if (m < n)
|
|
n = m;
|
|
|
|
if (n == 0) {
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
retval = -EAGAIN;
|
|
break;
|
|
}
|
|
if (signal_pending(current)) {
|
|
retval = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
schedule();
|
|
if (!s->busy)
|
|
break;
|
|
if (s->busy != file) {
|
|
retval = -EACCES;
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
|
|
buf, n);
|
|
if (m) {
|
|
n -= m;
|
|
retval = -EFAULT;
|
|
}
|
|
comedi_buf_write_free(async, n);
|
|
|
|
count += n;
|
|
nbytes -= n;
|
|
|
|
buf += n;
|
|
break; /* makes device work like a pipe */
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&async->wait_head, &wait);
|
|
|
|
done:
|
|
return count ? count : retval;
|
|
}
|
|
|
|
static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
|
|
loff_t *offset)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
struct comedi_async *async;
|
|
int n, m, count = 0, retval = 0;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
const unsigned minor = iminor(file->f_dentry->d_inode);
|
|
struct comedi_device_file_info *dev_file_info =
|
|
comedi_get_device_file_info(minor);
|
|
struct comedi_device *dev = dev_file_info->device;
|
|
|
|
if (!dev->attached) {
|
|
DPRINTK("no driver configured on comedi%i\n", dev->minor);
|
|
retval = -ENODEV;
|
|
goto done;
|
|
}
|
|
|
|
s = comedi_get_read_subdevice(dev_file_info);
|
|
if (s == NULL) {
|
|
retval = -EIO;
|
|
goto done;
|
|
}
|
|
async = s->async;
|
|
if (!nbytes) {
|
|
retval = 0;
|
|
goto done;
|
|
}
|
|
if (!s->busy) {
|
|
retval = 0;
|
|
goto done;
|
|
}
|
|
if (s->busy != file) {
|
|
retval = -EACCES;
|
|
goto done;
|
|
}
|
|
|
|
add_wait_queue(&async->wait_head, &wait);
|
|
while (nbytes > 0 && !retval) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
|
|
n = nbytes;
|
|
|
|
m = comedi_buf_read_n_available(async);
|
|
/* printk("%d available\n",m); */
|
|
if (async->buf_read_ptr + m > async->prealloc_bufsz)
|
|
m = async->prealloc_bufsz - async->buf_read_ptr;
|
|
/* printk("%d contiguous\n",m); */
|
|
if (m < n)
|
|
n = m;
|
|
|
|
if (n == 0) {
|
|
if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
|
|
do_become_nonbusy(dev, s);
|
|
if (comedi_get_subdevice_runflags(s) &
|
|
SRF_ERROR) {
|
|
retval = -EPIPE;
|
|
} else {
|
|
retval = 0;
|
|
}
|
|
break;
|
|
}
|
|
if (file->f_flags & O_NONBLOCK) {
|
|
retval = -EAGAIN;
|
|
break;
|
|
}
|
|
if (signal_pending(current)) {
|
|
retval = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
schedule();
|
|
if (!s->busy) {
|
|
retval = 0;
|
|
break;
|
|
}
|
|
if (s->busy != file) {
|
|
retval = -EACCES;
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
m = copy_to_user(buf, async->prealloc_buf +
|
|
async->buf_read_ptr, n);
|
|
if (m) {
|
|
n -= m;
|
|
retval = -EFAULT;
|
|
}
|
|
|
|
comedi_buf_read_alloc(async, n);
|
|
comedi_buf_read_free(async, n);
|
|
|
|
count += n;
|
|
nbytes -= n;
|
|
|
|
buf += n;
|
|
break; /* makes device work like a pipe */
|
|
}
|
|
if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) &&
|
|
async->buf_read_count - async->buf_write_count == 0) {
|
|
do_become_nonbusy(dev, s);
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&async->wait_head, &wait);
|
|
|
|
done:
|
|
return count ? count : retval;
|
|
}
|
|
|
|
/*
|
|
This function restores a subdevice to an idle state.
|
|
*/
|
|
void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s)
|
|
{
|
|
struct comedi_async *async = s->async;
|
|
|
|
comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
|
|
if (async) {
|
|
comedi_reset_async_buf(async);
|
|
async->inttrig = NULL;
|
|
} else {
|
|
printk(KERN_ERR
|
|
"BUG: (?) do_become_nonbusy called with async=0\n");
|
|
}
|
|
|
|
s->busy = NULL;
|
|
}
|
|
|
|
static int comedi_open(struct inode *inode, struct file *file)
|
|
{
|
|
const unsigned minor = iminor(inode);
|
|
struct comedi_device_file_info *dev_file_info =
|
|
comedi_get_device_file_info(minor);
|
|
struct comedi_device *dev =
|
|
dev_file_info ? dev_file_info->device : NULL;
|
|
|
|
if (dev == NULL) {
|
|
DPRINTK("invalid minor number\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* This is slightly hacky, but we want module autoloading
|
|
* to work for root.
|
|
* case: user opens device, attached -> ok
|
|
* case: user opens device, unattached, in_request_module=0 -> autoload
|
|
* case: user opens device, unattached, in_request_module=1 -> fail
|
|
* case: root opens device, attached -> ok
|
|
* case: root opens device, unattached, in_request_module=1 -> ok
|
|
* (typically called from modprobe)
|
|
* case: root opens device, unattached, in_request_module=0 -> autoload
|
|
*
|
|
* The last could be changed to "-> ok", which would deny root
|
|
* autoloading.
|
|
*/
|
|
mutex_lock(&dev->mutex);
|
|
if (dev->attached)
|
|
goto ok;
|
|
if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
|
|
DPRINTK("in request module\n");
|
|
mutex_unlock(&dev->mutex);
|
|
return -ENODEV;
|
|
}
|
|
if (capable(CAP_NET_ADMIN) && dev->in_request_module)
|
|
goto ok;
|
|
|
|
dev->in_request_module = 1;
|
|
|
|
#ifdef CONFIG_KMOD
|
|
mutex_unlock(&dev->mutex);
|
|
request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
|
|
mutex_lock(&dev->mutex);
|
|
#endif
|
|
|
|
dev->in_request_module = 0;
|
|
|
|
if (!dev->attached && !capable(CAP_NET_ADMIN)) {
|
|
DPRINTK("not attached and not CAP_NET_ADMIN\n");
|
|
mutex_unlock(&dev->mutex);
|
|
return -ENODEV;
|
|
}
|
|
ok:
|
|
__module_get(THIS_MODULE);
|
|
|
|
if (dev->attached) {
|
|
if (!try_module_get(dev->driver->module)) {
|
|
module_put(THIS_MODULE);
|
|
mutex_unlock(&dev->mutex);
|
|
return -ENOSYS;
|
|
}
|
|
}
|
|
|
|
if (dev->attached && dev->use_count == 0 && dev->open) {
|
|
int rc = dev->open(dev);
|
|
if (rc < 0) {
|
|
module_put(dev->driver->module);
|
|
module_put(THIS_MODULE);
|
|
mutex_unlock(&dev->mutex);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
dev->use_count++;
|
|
|
|
mutex_unlock(&dev->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int comedi_close(struct inode *inode, struct file *file)
|
|
{
|
|
const unsigned minor = iminor(inode);
|
|
struct comedi_device_file_info *dev_file_info =
|
|
comedi_get_device_file_info(minor);
|
|
struct comedi_device *dev = dev_file_info->device;
|
|
struct comedi_subdevice *s = NULL;
|
|
int i;
|
|
|
|
mutex_lock(&dev->mutex);
|
|
|
|
if (dev->subdevices) {
|
|
for (i = 0; i < dev->n_subdevices; i++) {
|
|
s = dev->subdevices + i;
|
|
|
|
if (s->busy == file)
|
|
do_cancel(dev, s);
|
|
if (s->lock == file)
|
|
s->lock = NULL;
|
|
}
|
|
}
|
|
if (dev->attached && dev->use_count == 1 && dev->close)
|
|
dev->close(dev);
|
|
|
|
module_put(THIS_MODULE);
|
|
if (dev->attached)
|
|
module_put(dev->driver->module);
|
|
|
|
dev->use_count--;
|
|
|
|
mutex_unlock(&dev->mutex);
|
|
|
|
if (file->f_flags & FASYNC)
|
|
comedi_fasync(-1, file, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int comedi_fasync(int fd, struct file *file, int on)
|
|
{
|
|
const unsigned minor = iminor(file->f_dentry->d_inode);
|
|
struct comedi_device_file_info *dev_file_info =
|
|
comedi_get_device_file_info(minor);
|
|
|
|
struct comedi_device *dev = dev_file_info->device;
|
|
|
|
return fasync_helper(fd, file, on, &dev->async_queue);
|
|
}
|
|
|
|
const struct file_operations comedi_fops = {
|
|
.owner = THIS_MODULE,
|
|
.unlocked_ioctl = comedi_unlocked_ioctl,
|
|
.compat_ioctl = comedi_compat_ioctl,
|
|
.open = comedi_open,
|
|
.release = comedi_close,
|
|
.read = comedi_read,
|
|
.write = comedi_write,
|
|
.mmap = comedi_mmap,
|
|
.poll = comedi_poll,
|
|
.fasync = comedi_fasync,
|
|
};
|
|
|
|
struct class *comedi_class;
|
|
static struct cdev comedi_cdev;
|
|
|
|
static void comedi_cleanup_legacy_minors(void)
|
|
{
|
|
unsigned i;
|
|
|
|
for (i = 0; i < comedi_num_legacy_minors; i++)
|
|
comedi_free_board_minor(i);
|
|
}
|
|
|
|
static int __init comedi_init(void)
|
|
{
|
|
int i;
|
|
int retval;
|
|
|
|
printk(KERN_INFO "comedi: version " COMEDI_RELEASE
|
|
" - http://www.comedi.org\n");
|
|
|
|
if (comedi_num_legacy_minors < 0 ||
|
|
comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
|
|
printk(KERN_ERR "comedi: error: invalid value for module "
|
|
"parameter \"comedi_num_legacy_minors\". Valid values "
|
|
"are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* comedi is unusable if both comedi_autoconfig and
|
|
* comedi_num_legacy_minors are zero, so we might as well adjust the
|
|
* defaults in that case
|
|
*/
|
|
if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0)
|
|
comedi_num_legacy_minors = 16;
|
|
|
|
memset(comedi_file_info_table, 0,
|
|
sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS);
|
|
|
|
retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
|
|
COMEDI_NUM_MINORS, "comedi");
|
|
if (retval)
|
|
return -EIO;
|
|
cdev_init(&comedi_cdev, &comedi_fops);
|
|
comedi_cdev.owner = THIS_MODULE;
|
|
kobject_set_name(&comedi_cdev.kobj, "comedi");
|
|
if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
|
|
unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
|
|
COMEDI_NUM_MINORS);
|
|
return -EIO;
|
|
}
|
|
comedi_class = class_create(THIS_MODULE, "comedi");
|
|
if (IS_ERR(comedi_class)) {
|
|
printk(KERN_ERR "comedi: failed to create class");
|
|
cdev_del(&comedi_cdev);
|
|
unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
|
|
COMEDI_NUM_MINORS);
|
|
return PTR_ERR(comedi_class);
|
|
}
|
|
|
|
/* XXX requires /proc interface */
|
|
comedi_proc_init();
|
|
|
|
/* create devices files for legacy/manual use */
|
|
for (i = 0; i < comedi_num_legacy_minors; i++) {
|
|
int minor;
|
|
minor = comedi_alloc_board_minor(NULL);
|
|
if (minor < 0) {
|
|
comedi_cleanup_legacy_minors();
|
|
cdev_del(&comedi_cdev);
|
|
unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
|
|
COMEDI_NUM_MINORS);
|
|
return minor;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit comedi_cleanup(void)
|
|
{
|
|
int i;
|
|
|
|
comedi_cleanup_legacy_minors();
|
|
for (i = 0; i < COMEDI_NUM_MINORS; ++i)
|
|
BUG_ON(comedi_file_info_table[i]);
|
|
|
|
class_destroy(comedi_class);
|
|
cdev_del(&comedi_cdev);
|
|
unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
|
|
|
|
comedi_proc_cleanup();
|
|
}
|
|
|
|
module_init(comedi_init);
|
|
module_exit(comedi_cleanup);
|
|
|
|
void comedi_error(const struct comedi_device *dev, const char *s)
|
|
{
|
|
printk(KERN_ERR "comedi%d: %s: %s\n", dev->minor,
|
|
dev->driver->driver_name, s);
|
|
}
|
|
EXPORT_SYMBOL(comedi_error);
|
|
|
|
void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
|
|
{
|
|
struct comedi_async *async = s->async;
|
|
unsigned runflags = 0;
|
|
unsigned runflags_mask = 0;
|
|
|
|
/* DPRINTK("comedi_event 0x%x\n",mask); */
|
|
|
|
if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0)
|
|
return;
|
|
|
|
if (s->
|
|
async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
|
|
COMEDI_CB_OVERFLOW)) {
|
|
runflags_mask |= SRF_RUNNING;
|
|
}
|
|
/* remember if an error event has occured, so an error
|
|
* can be returned the next time the user does a read() */
|
|
if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
|
|
runflags_mask |= SRF_ERROR;
|
|
runflags |= SRF_ERROR;
|
|
}
|
|
if (runflags_mask) {
|
|
/*sets SRF_ERROR and SRF_RUNNING together atomically */
|
|
comedi_set_subdevice_runflags(s, runflags_mask, runflags);
|
|
}
|
|
|
|
if (async->cb_mask & s->async->events) {
|
|
if (comedi_get_subdevice_runflags(s) & SRF_USER) {
|
|
wake_up_interruptible(&async->wait_head);
|
|
if (s->subdev_flags & SDF_CMD_READ)
|
|
kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
|
|
if (s->subdev_flags & SDF_CMD_WRITE)
|
|
kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
|
|
} else {
|
|
if (async->cb_func)
|
|
async->cb_func(s->async->events, async->cb_arg);
|
|
}
|
|
}
|
|
s->async->events = 0;
|
|
}
|
|
EXPORT_SYMBOL(comedi_event);
|
|
|
|
unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
|
|
{
|
|
unsigned long flags;
|
|
unsigned runflags;
|
|
|
|
spin_lock_irqsave(&s->spin_lock, flags);
|
|
runflags = s->runflags;
|
|
spin_unlock_irqrestore(&s->spin_lock, flags);
|
|
return runflags;
|
|
}
|
|
EXPORT_SYMBOL(comedi_get_subdevice_runflags);
|
|
|
|
static int is_device_busy(struct comedi_device *dev)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
int i;
|
|
|
|
if (!dev->attached)
|
|
return 0;
|
|
|
|
for (i = 0; i < dev->n_subdevices; i++) {
|
|
s = dev->subdevices + i;
|
|
if (s->busy)
|
|
return 1;
|
|
if (s->async && s->async->mmap_count)
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void comedi_device_init(struct comedi_device *dev)
|
|
{
|
|
memset(dev, 0, sizeof(struct comedi_device));
|
|
spin_lock_init(&dev->spinlock);
|
|
mutex_init(&dev->mutex);
|
|
dev->minor = -1;
|
|
}
|
|
|
|
static void comedi_device_cleanup(struct comedi_device *dev)
|
|
{
|
|
if (dev == NULL)
|
|
return;
|
|
mutex_lock(&dev->mutex);
|
|
comedi_device_detach(dev);
|
|
mutex_unlock(&dev->mutex);
|
|
mutex_destroy(&dev->mutex);
|
|
}
|
|
|
|
int comedi_alloc_board_minor(struct device *hardware_device)
|
|
{
|
|
unsigned long flags;
|
|
struct comedi_device_file_info *info;
|
|
struct device *csdev;
|
|
unsigned i;
|
|
int retval;
|
|
|
|
info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
|
|
if (info == NULL)
|
|
return -ENOMEM;
|
|
info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
|
|
if (info->device == NULL) {
|
|
kfree(info);
|
|
return -ENOMEM;
|
|
}
|
|
comedi_device_init(info->device);
|
|
spin_lock_irqsave(&comedi_file_info_table_lock, flags);
|
|
for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) {
|
|
if (comedi_file_info_table[i] == NULL) {
|
|
comedi_file_info_table[i] = info;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
|
|
if (i == COMEDI_NUM_BOARD_MINORS) {
|
|
comedi_device_cleanup(info->device);
|
|
kfree(info->device);
|
|
kfree(info);
|
|
printk(KERN_ERR
|
|
"comedi: error: "
|
|
"ran out of minor numbers for board device files.\n");
|
|
return -EBUSY;
|
|
}
|
|
info->device->minor = i;
|
|
csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL,
|
|
MKDEV(COMEDI_MAJOR, i), NULL,
|
|
hardware_device, "comedi%i", i);
|
|
if (!IS_ERR(csdev))
|
|
info->device->class_dev = csdev;
|
|
dev_set_drvdata(csdev, info);
|
|
retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb);
|
|
if (retval) {
|
|
printk(KERN_ERR
|
|
"comedi: "
|
|
"failed to create sysfs attribute file \"%s\".\n",
|
|
dev_attr_max_read_buffer_kb.attr.name);
|
|
comedi_free_board_minor(i);
|
|
return retval;
|
|
}
|
|
retval = device_create_file(csdev, &dev_attr_read_buffer_kb);
|
|
if (retval) {
|
|
printk(KERN_ERR
|
|
"comedi: "
|
|
"failed to create sysfs attribute file \"%s\".\n",
|
|
dev_attr_read_buffer_kb.attr.name);
|
|
comedi_free_board_minor(i);
|
|
return retval;
|
|
}
|
|
retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb);
|
|
if (retval) {
|
|
printk(KERN_ERR
|
|
"comedi: "
|
|
"failed to create sysfs attribute file \"%s\".\n",
|
|
dev_attr_max_write_buffer_kb.attr.name);
|
|
comedi_free_board_minor(i);
|
|
return retval;
|
|
}
|
|
retval = device_create_file(csdev, &dev_attr_write_buffer_kb);
|
|
if (retval) {
|
|
printk(KERN_ERR
|
|
"comedi: "
|
|
"failed to create sysfs attribute file \"%s\".\n",
|
|
dev_attr_write_buffer_kb.attr.name);
|
|
comedi_free_board_minor(i);
|
|
return retval;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
void comedi_free_board_minor(unsigned minor)
|
|
{
|
|
unsigned long flags;
|
|
struct comedi_device_file_info *info;
|
|
|
|
BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
|
|
spin_lock_irqsave(&comedi_file_info_table_lock, flags);
|
|
info = comedi_file_info_table[minor];
|
|
comedi_file_info_table[minor] = NULL;
|
|
spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
|
|
|
|
if (info) {
|
|
struct comedi_device *dev = info->device;
|
|
if (dev) {
|
|
if (dev->class_dev) {
|
|
device_destroy(comedi_class,
|
|
MKDEV(COMEDI_MAJOR, dev->minor));
|
|
}
|
|
comedi_device_cleanup(dev);
|
|
kfree(dev);
|
|
}
|
|
kfree(info);
|
|
}
|
|
}
|
|
|
|
int comedi_alloc_subdevice_minor(struct comedi_device *dev,
|
|
struct comedi_subdevice *s)
|
|
{
|
|
unsigned long flags;
|
|
struct comedi_device_file_info *info;
|
|
struct device *csdev;
|
|
unsigned i;
|
|
int retval;
|
|
|
|
info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
|
|
if (info == NULL)
|
|
return -ENOMEM;
|
|
info->device = dev;
|
|
info->read_subdevice = s;
|
|
info->write_subdevice = s;
|
|
spin_lock_irqsave(&comedi_file_info_table_lock, flags);
|
|
for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) {
|
|
if (comedi_file_info_table[i] == NULL) {
|
|
comedi_file_info_table[i] = info;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
|
|
if (i == COMEDI_NUM_MINORS) {
|
|
kfree(info);
|
|
printk(KERN_ERR
|
|
"comedi: error: "
|
|
"ran out of minor numbers for board device files.\n");
|
|
return -EBUSY;
|
|
}
|
|
s->minor = i;
|
|
csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev,
|
|
MKDEV(COMEDI_MAJOR, i), NULL, NULL,
|
|
"comedi%i_subd%i", dev->minor,
|
|
(int)(s - dev->subdevices));
|
|
if (!IS_ERR(csdev))
|
|
s->class_dev = csdev;
|
|
dev_set_drvdata(csdev, info);
|
|
retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb);
|
|
if (retval) {
|
|
printk(KERN_ERR
|
|
"comedi: "
|
|
"failed to create sysfs attribute file \"%s\".\n",
|
|
dev_attr_max_read_buffer_kb.attr.name);
|
|
comedi_free_subdevice_minor(s);
|
|
return retval;
|
|
}
|
|
retval = device_create_file(csdev, &dev_attr_read_buffer_kb);
|
|
if (retval) {
|
|
printk(KERN_ERR
|
|
"comedi: "
|
|
"failed to create sysfs attribute file \"%s\".\n",
|
|
dev_attr_read_buffer_kb.attr.name);
|
|
comedi_free_subdevice_minor(s);
|
|
return retval;
|
|
}
|
|
retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb);
|
|
if (retval) {
|
|
printk(KERN_ERR
|
|
"comedi: "
|
|
"failed to create sysfs attribute file \"%s\".\n",
|
|
dev_attr_max_write_buffer_kb.attr.name);
|
|
comedi_free_subdevice_minor(s);
|
|
return retval;
|
|
}
|
|
retval = device_create_file(csdev, &dev_attr_write_buffer_kb);
|
|
if (retval) {
|
|
printk(KERN_ERR
|
|
"comedi: "
|
|
"failed to create sysfs attribute file \"%s\".\n",
|
|
dev_attr_write_buffer_kb.attr.name);
|
|
comedi_free_subdevice_minor(s);
|
|
return retval;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
void comedi_free_subdevice_minor(struct comedi_subdevice *s)
|
|
{
|
|
unsigned long flags;
|
|
struct comedi_device_file_info *info;
|
|
|
|
if (s == NULL)
|
|
return;
|
|
if (s->minor < 0)
|
|
return;
|
|
|
|
BUG_ON(s->minor >= COMEDI_NUM_MINORS);
|
|
BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
|
|
|
|
spin_lock_irqsave(&comedi_file_info_table_lock, flags);
|
|
info = comedi_file_info_table[s->minor];
|
|
comedi_file_info_table[s->minor] = NULL;
|
|
spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
|
|
|
|
if (s->class_dev) {
|
|
device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
|
|
s->class_dev = NULL;
|
|
}
|
|
kfree(info);
|
|
}
|
|
|
|
struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor)
|
|
{
|
|
unsigned long flags;
|
|
struct comedi_device_file_info *info;
|
|
|
|
BUG_ON(minor >= COMEDI_NUM_MINORS);
|
|
spin_lock_irqsave(&comedi_file_info_table_lock, flags);
|
|
info = comedi_file_info_table[minor];
|
|
spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
|
|
return info;
|
|
}
|
|
EXPORT_SYMBOL_GPL(comedi_get_device_file_info);
|
|
|
|
static int resize_async_buffer(struct comedi_device *dev,
|
|
struct comedi_subdevice *s,
|
|
struct comedi_async *async, unsigned new_size)
|
|
{
|
|
int retval;
|
|
|
|
if (new_size > async->max_bufsize)
|
|
return -EPERM;
|
|
|
|
if (s->busy) {
|
|
DPRINTK("subdevice is busy, cannot resize buffer\n");
|
|
return -EBUSY;
|
|
}
|
|
if (async->mmap_count) {
|
|
DPRINTK("subdevice is mmapped, cannot resize buffer\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (!async->prealloc_buf)
|
|
return -EINVAL;
|
|
|
|
/* make sure buffer is an integral number of pages
|
|
* (we round up) */
|
|
new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
|
|
|
|
retval = comedi_buf_alloc(dev, s, new_size);
|
|
if (retval < 0)
|
|
return retval;
|
|
|
|
if (s->buf_change) {
|
|
retval = s->buf_change(dev, s, new_size);
|
|
if (retval < 0)
|
|
return retval;
|
|
}
|
|
|
|
DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
|
|
dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz);
|
|
return 0;
|
|
}
|
|
|
|
/* sysfs attribute files */
|
|
|
|
static const unsigned bytes_per_kibi = 1024;
|
|
|
|
static ssize_t show_max_read_buffer_kb(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
ssize_t retval;
|
|
struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
|
unsigned max_buffer_size_kb = 0;
|
|
struct comedi_subdevice *const read_subdevice =
|
|
comedi_get_read_subdevice(info);
|
|
|
|
mutex_lock(&info->device->mutex);
|
|
if (read_subdevice &&
|
|
(read_subdevice->subdev_flags & SDF_CMD_READ) &&
|
|
read_subdevice->async) {
|
|
max_buffer_size_kb = read_subdevice->async->max_bufsize /
|
|
bytes_per_kibi;
|
|
}
|
|
retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
|
|
mutex_unlock(&info->device->mutex);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static ssize_t store_max_read_buffer_kb(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
|
unsigned long new_max_size_kb;
|
|
uint64_t new_max_size;
|
|
struct comedi_subdevice *const read_subdevice =
|
|
comedi_get_read_subdevice(info);
|
|
|
|
if (strict_strtoul(buf, 10, &new_max_size_kb))
|
|
return -EINVAL;
|
|
if (new_max_size_kb != (uint32_t) new_max_size_kb)
|
|
return -EINVAL;
|
|
new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi;
|
|
if (new_max_size != (uint32_t) new_max_size)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&info->device->mutex);
|
|
if (read_subdevice == NULL ||
|
|
(read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
|
|
read_subdevice->async == NULL) {
|
|
mutex_unlock(&info->device->mutex);
|
|
return -EINVAL;
|
|
}
|
|
read_subdevice->async->max_bufsize = new_max_size;
|
|
mutex_unlock(&info->device->mutex);
|
|
|
|
return count;
|
|
}
|
|
|
|
static struct device_attribute dev_attr_max_read_buffer_kb = {
|
|
.attr = {
|
|
.name = "max_read_buffer_kb",
|
|
.mode = S_IRUGO | S_IWUSR},
|
|
.show = &show_max_read_buffer_kb,
|
|
.store = &store_max_read_buffer_kb
|
|
};
|
|
|
|
static ssize_t show_read_buffer_kb(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
ssize_t retval;
|
|
struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
|
unsigned buffer_size_kb = 0;
|
|
struct comedi_subdevice *const read_subdevice =
|
|
comedi_get_read_subdevice(info);
|
|
|
|
mutex_lock(&info->device->mutex);
|
|
if (read_subdevice &&
|
|
(read_subdevice->subdev_flags & SDF_CMD_READ) &&
|
|
read_subdevice->async) {
|
|
buffer_size_kb = read_subdevice->async->prealloc_bufsz /
|
|
bytes_per_kibi;
|
|
}
|
|
retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
|
|
mutex_unlock(&info->device->mutex);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static ssize_t store_read_buffer_kb(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
|
unsigned long new_size_kb;
|
|
uint64_t new_size;
|
|
int retval;
|
|
struct comedi_subdevice *const read_subdevice =
|
|
comedi_get_read_subdevice(info);
|
|
|
|
if (strict_strtoul(buf, 10, &new_size_kb))
|
|
return -EINVAL;
|
|
if (new_size_kb != (uint32_t) new_size_kb)
|
|
return -EINVAL;
|
|
new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;
|
|
if (new_size != (uint32_t) new_size)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&info->device->mutex);
|
|
if (read_subdevice == NULL ||
|
|
(read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
|
|
read_subdevice->async == NULL) {
|
|
mutex_unlock(&info->device->mutex);
|
|
return -EINVAL;
|
|
}
|
|
retval = resize_async_buffer(info->device, read_subdevice,
|
|
read_subdevice->async, new_size);
|
|
mutex_unlock(&info->device->mutex);
|
|
|
|
if (retval < 0)
|
|
return retval;
|
|
return count;
|
|
}
|
|
|
|
static struct device_attribute dev_attr_read_buffer_kb = {
|
|
.attr = {
|
|
.name = "read_buffer_kb",
|
|
.mode = S_IRUGO | S_IWUSR | S_IWGRP},
|
|
.show = &show_read_buffer_kb,
|
|
.store = &store_read_buffer_kb
|
|
};
|
|
|
|
static ssize_t show_max_write_buffer_kb(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
ssize_t retval;
|
|
struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
|
unsigned max_buffer_size_kb = 0;
|
|
struct comedi_subdevice *const write_subdevice =
|
|
comedi_get_write_subdevice(info);
|
|
|
|
mutex_lock(&info->device->mutex);
|
|
if (write_subdevice &&
|
|
(write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
|
|
write_subdevice->async) {
|
|
max_buffer_size_kb = write_subdevice->async->max_bufsize /
|
|
bytes_per_kibi;
|
|
}
|
|
retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
|
|
mutex_unlock(&info->device->mutex);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static ssize_t store_max_write_buffer_kb(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
|
unsigned long new_max_size_kb;
|
|
uint64_t new_max_size;
|
|
struct comedi_subdevice *const write_subdevice =
|
|
comedi_get_write_subdevice(info);
|
|
|
|
if (strict_strtoul(buf, 10, &new_max_size_kb))
|
|
return -EINVAL;
|
|
if (new_max_size_kb != (uint32_t) new_max_size_kb)
|
|
return -EINVAL;
|
|
new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi;
|
|
if (new_max_size != (uint32_t) new_max_size)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&info->device->mutex);
|
|
if (write_subdevice == NULL ||
|
|
(write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
|
|
write_subdevice->async == NULL) {
|
|
mutex_unlock(&info->device->mutex);
|
|
return -EINVAL;
|
|
}
|
|
write_subdevice->async->max_bufsize = new_max_size;
|
|
mutex_unlock(&info->device->mutex);
|
|
|
|
return count;
|
|
}
|
|
|
|
static struct device_attribute dev_attr_max_write_buffer_kb = {
|
|
.attr = {
|
|
.name = "max_write_buffer_kb",
|
|
.mode = S_IRUGO | S_IWUSR},
|
|
.show = &show_max_write_buffer_kb,
|
|
.store = &store_max_write_buffer_kb
|
|
};
|
|
|
|
static ssize_t show_write_buffer_kb(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
ssize_t retval;
|
|
struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
|
unsigned buffer_size_kb = 0;
|
|
struct comedi_subdevice *const write_subdevice =
|
|
comedi_get_write_subdevice(info);
|
|
|
|
mutex_lock(&info->device->mutex);
|
|
if (write_subdevice &&
|
|
(write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
|
|
write_subdevice->async) {
|
|
buffer_size_kb = write_subdevice->async->prealloc_bufsz /
|
|
bytes_per_kibi;
|
|
}
|
|
retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
|
|
mutex_unlock(&info->device->mutex);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static ssize_t store_write_buffer_kb(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct comedi_device_file_info *info = dev_get_drvdata(dev);
|
|
unsigned long new_size_kb;
|
|
uint64_t new_size;
|
|
int retval;
|
|
struct comedi_subdevice *const write_subdevice =
|
|
comedi_get_write_subdevice(info);
|
|
|
|
if (strict_strtoul(buf, 10, &new_size_kb))
|
|
return -EINVAL;
|
|
if (new_size_kb != (uint32_t) new_size_kb)
|
|
return -EINVAL;
|
|
new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;
|
|
if (new_size != (uint32_t) new_size)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&info->device->mutex);
|
|
if (write_subdevice == NULL ||
|
|
(write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
|
|
write_subdevice->async == NULL) {
|
|
mutex_unlock(&info->device->mutex);
|
|
return -EINVAL;
|
|
}
|
|
retval = resize_async_buffer(info->device, write_subdevice,
|
|
write_subdevice->async, new_size);
|
|
mutex_unlock(&info->device->mutex);
|
|
|
|
if (retval < 0)
|
|
return retval;
|
|
return count;
|
|
}
|
|
|
|
static struct device_attribute dev_attr_write_buffer_kb = {
|
|
.attr = {
|
|
.name = "write_buffer_kb",
|
|
.mode = S_IRUGO | S_IWUSR | S_IWGRP},
|
|
.show = &show_write_buffer_kb,
|
|
.store = &store_write_buffer_kb
|
|
};
|