![Rusty Russell](/assets/img/avatar_default.png)
module_param(bool) used to counter-intuitively take an int. In
fddd5201
(mid-2009) we allowed bool or int/unsigned int using a messy
trick.
It's time to remove the int/unsigned int option. For this version
it'll simply give a warning, but it'll break next kernel version.
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2707 lines
62 KiB
C
2707 lines
62 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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bool 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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static 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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strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
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strlcpy(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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/*
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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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|
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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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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;
|
|
if (s->lock == file)
|
|
us->subd_flags |= SDF_LOCK_OWNER;
|
|
if (!s->maxdata && s->maxdata_list)
|
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us->subd_flags |= SDF_MAXDATA;
|
|
if (s->flaglist)
|
|
us->subd_flags |= SDF_FLAGS;
|
|
if (s->range_table_list)
|
|
us->subd_flags |= SDF_RANGETYPE;
|
|
if (s->do_cmd)
|
|
us->subd_flags |= SDF_CMD;
|
|
|
|
if (s->insn_bits != &insn_inval)
|
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us->insn_bits_support = COMEDI_SUPPORTED;
|
|
else
|
|
us->insn_bits_support = COMEDI_UNSUPPORTED;
|
|
|
|
us->settling_time_0 = s->settling_time_0;
|
|
}
|
|
|
|
ret = copy_to_user(arg, tmp,
|
|
dev->n_subdevices * sizeof(struct comedi_subdinfo));
|
|
|
|
kfree(tmp);
|
|
|
|
return ret ? -EFAULT : 0;
|
|
}
|
|
|
|
/*
|
|
COMEDI_CHANINFO
|
|
subdevice info ioctl
|
|
|
|
arg:
|
|
pointer to chaninfo structure
|
|
|
|
reads:
|
|
chaninfo structure at arg
|
|
|
|
writes:
|
|
arrays at elements of chaninfo structure
|
|
|
|
*/
|
|
static int do_chaninfo_ioctl(struct comedi_device *dev,
|
|
struct comedi_chaninfo __user *arg)
|
|
{
|
|
struct comedi_subdevice *s;
|
|
struct comedi_chaninfo it;
|
|
|
|
if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo)))
|
|
return -EFAULT;
|
|
|
|
if (it.subdev >= dev->n_subdevices)
|
|
return -EINVAL;
|
|
s = dev->subdevices + it.subdev;
|
|
|
|
if (it.maxdata_list) {
|
|
if (s->maxdata || !s->maxdata_list)
|
|
return -EINVAL;
|
|
if (copy_to_user(it.maxdata_list, s->maxdata_list,
|
|
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);
|
|
if (put_user(x, it.rangelist + i))
|
|
return -EFAULT;
|
|
}
|
|
#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 =
|
|
kcalloc(insnlist.n_insns, sizeof(struct comedi_insn), 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;
|
|
} else {
|
|
/* Most drivers ignore the base channel in
|
|
* insn->chanspec. Fix this here if
|
|
* the subdevice has <= 32 channels. */
|
|
unsigned int shift;
|
|
unsigned int orig_mask;
|
|
|
|
orig_mask = data[0];
|
|
if (s->n_chan <= 32) {
|
|
shift = CR_CHAN(insn->chanspec);
|
|
if (shift > 0) {
|
|
insn->chanspec = 0;
|
|
data[0] <<= shift;
|
|
data[1] <<= shift;
|
|
}
|
|
} else
|
|
shift = 0;
|
|
ret = s->insn_bits(dev, s, insn, data);
|
|
data[0] = orig_mask;
|
|
if (shift > 0)
|
|
data[1] >>= shift;
|
|
}
|
|
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 0
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
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_vm_open(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 void comedi_vm_close(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 = {
|
|
.open = comedi_vm_open,
|
|
.close = comedi_vm_close,
|
|
};
|
|
|
|
static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
const unsigned minor = iminor(file->f_dentry->d_inode);
|
|
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;
|
|
struct comedi_device_file_info *dev_file_info;
|
|
struct comedi_device *dev;
|
|
|
|
dev_file_info = comedi_get_device_file_info(minor);
|
|
if (dev_file_info == NULL)
|
|
return -ENODEV;
|
|
dev = dev_file_info->device;
|
|
if (dev == NULL)
|
|
return -ENODEV;
|
|
|
|
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_subdevice *read_subdev;
|
|
struct comedi_subdevice *write_subdev;
|
|
struct comedi_device_file_info *dev_file_info;
|
|
struct comedi_device *dev;
|
|
dev_file_info = comedi_get_device_file_info(minor);
|
|
|
|
if (dev_file_info == NULL)
|
|
return -ENODEV;
|
|
dev = dev_file_info->device;
|
|
if (dev == NULL)
|
|
return -ENODEV;
|
|
|
|
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;
|
|
struct comedi_device *dev;
|
|
dev_file_info = comedi_get_device_file_info(minor);
|
|
|
|
if (dev_file_info == NULL)
|
|
return -ENODEV;
|
|
dev = dev_file_info->device;
|
|
if (dev == NULL)
|
|
return -ENODEV;
|
|
|
|
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;
|
|
}
|
|
schedule();
|
|
if (signal_pending(current)) {
|
|
retval = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
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;
|
|
struct comedi_device *dev;
|
|
dev_file_info = comedi_get_device_file_info(minor);
|
|
|
|
if (dev_file_info == NULL)
|
|
return -ENODEV;
|
|
dev = dev_file_info->device;
|
|
if (dev == NULL)
|
|
return -ENODEV;
|
|
|
|
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;
|
|
}
|
|
schedule();
|
|
if (signal_pending(current)) {
|
|
retval = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
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_subdevice *s = NULL;
|
|
int i;
|
|
struct comedi_device_file_info *dev_file_info;
|
|
struct comedi_device *dev;
|
|
dev_file_info = comedi_get_device_file_info(minor);
|
|
|
|
if (dev_file_info == NULL)
|
|
return -ENODEV;
|
|
dev = dev_file_info->device;
|
|
if (dev == NULL)
|
|
return -ENODEV;
|
|
|
|
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;
|
|
struct comedi_device *dev;
|
|
dev_file_info = comedi_get_device_file_info(minor);
|
|
|
|
if (dev_file_info == NULL)
|
|
return -ENODEV;
|
|
dev = dev_file_info->device;
|
|
if (dev == NULL)
|
|
return -ENODEV;
|
|
|
|
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,
|
|
.llseek = noop_llseek,
|
|
};
|
|
|
|
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 occurred, 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 = device_create(comedi_class, hardware_device,
|
|
MKDEV(COMEDI_MAJOR, i), NULL, "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 = device_create(comedi_class, dev->class_dev,
|
|
MKDEV(COMEDI_MAJOR, i), 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 int new_max_size_kb;
|
|
unsigned int new_max_size;
|
|
int ret;
|
|
struct comedi_subdevice *const read_subdevice =
|
|
comedi_get_read_subdevice(info);
|
|
|
|
ret = kstrtouint(buf, 10, &new_max_size_kb);
|
|
if (ret)
|
|
return ret;
|
|
if (new_max_size_kb > (UINT_MAX / bytes_per_kibi))
|
|
return -EINVAL;
|
|
new_max_size = new_max_size_kb * bytes_per_kibi;
|
|
|
|
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 int new_size_kb;
|
|
unsigned int new_size;
|
|
int retval;
|
|
int ret;
|
|
struct comedi_subdevice *const read_subdevice =
|
|
comedi_get_read_subdevice(info);
|
|
|
|
ret = kstrtouint(buf, 10, &new_size_kb);
|
|
if (ret)
|
|
return ret;
|
|
if (new_size_kb > (UINT_MAX / bytes_per_kibi))
|
|
return -EINVAL;
|
|
new_size = new_size_kb * bytes_per_kibi;
|
|
|
|
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 int new_max_size_kb;
|
|
unsigned int new_max_size;
|
|
int ret;
|
|
struct comedi_subdevice *const write_subdevice =
|
|
comedi_get_write_subdevice(info);
|
|
|
|
ret = kstrtouint(buf, 10, &new_max_size_kb);
|
|
if (ret)
|
|
return ret;
|
|
if (new_max_size_kb > (UINT_MAX / bytes_per_kibi))
|
|
return -EINVAL;
|
|
new_max_size = new_max_size_kb * bytes_per_kibi;
|
|
|
|
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 int new_size_kb;
|
|
unsigned int new_size;
|
|
int retval;
|
|
int ret;
|
|
struct comedi_subdevice *const write_subdevice =
|
|
comedi_get_write_subdevice(info);
|
|
|
|
ret = kstrtouint(buf, 10, &new_size_kb);
|
|
if (ret)
|
|
return ret;
|
|
if (new_size_kb > (UINT_MAX / bytes_per_kibi))
|
|
return -EINVAL;
|
|
new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;
|
|
|
|
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
|
|
};
|