diff options
Diffstat (limited to 'drivers/staging/comedi/comedi_fops.c')
| -rw-r--r-- | drivers/staging/comedi/comedi_fops.c | 2603 |
1 files changed, 2603 insertions, 0 deletions
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c new file mode 100644 index 00000000..0ae406a4 --- /dev/null +++ b/drivers/staging/comedi/comedi_fops.c @@ -0,0 +1,2603 @@ +/* + comedi/comedi_fops.c + comedi kernel module + + COMEDI - Linux Control and Measurement Device Interface + Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + +*/ + +#undef DEBUG + +#include "comedi_compat32.h" + +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/fcntl.h> +#include <linux/delay.h> +#include <linux/ioport.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/kmod.h> +#include <linux/poll.h> +#include <linux/init.h> +#include <linux/device.h> +#include <linux/vmalloc.h> +#include <linux/fs.h> +#include "comedidev.h" +#include <linux/cdev.h> +#include <linux/stat.h> + +#include <linux/io.h> +#include <linux/uaccess.h> + +#include "comedi_internal.h" + +#define COMEDI_NUM_MINORS 0x100 +#define COMEDI_NUM_SUBDEVICE_MINORS \ + (COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS) + +#ifdef CONFIG_COMEDI_DEBUG +int comedi_debug; +EXPORT_SYMBOL_GPL(comedi_debug); +module_param(comedi_debug, int, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(comedi_debug, + "enable comedi core and driver debugging if non-zero (default 0)" + ); +#endif + +static int comedi_num_legacy_minors; +module_param(comedi_num_legacy_minors, int, S_IRUGO); +MODULE_PARM_DESC(comedi_num_legacy_minors, + "number of comedi minor devices to reserve for non-auto-configured devices (default 0)" + ); + +unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB; +module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(comedi_default_buf_size_kb, + "default asynchronous buffer size in KiB (default " + __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")"); + +unsigned int comedi_default_buf_maxsize_kb + = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB; +module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(comedi_default_buf_maxsize_kb, + "default maximum size of asynchronous buffer in KiB (default " + __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")"); + +static DEFINE_MUTEX(comedi_board_minor_table_lock); +static struct comedi_device +*comedi_board_minor_table[COMEDI_NUM_BOARD_MINORS]; + +static DEFINE_MUTEX(comedi_subdevice_minor_table_lock); +/* Note: indexed by minor - COMEDI_NUM_BOARD_MINORS. */ +static struct comedi_subdevice +*comedi_subdevice_minor_table[COMEDI_NUM_SUBDEVICE_MINORS]; + +static struct class *comedi_class; +static struct cdev comedi_cdev; + +static void comedi_device_init(struct comedi_device *dev) +{ + spin_lock_init(&dev->spinlock); + mutex_init(&dev->mutex); + dev->minor = -1; +} + +static void comedi_device_cleanup(struct comedi_device *dev) +{ + struct module *driver_module = NULL; + + if (dev == NULL) + return; + mutex_lock(&dev->mutex); + if (dev->attached) + driver_module = dev->driver->module; + comedi_device_detach(dev); + while (dev->use_count > 0) { + if (driver_module) + module_put(driver_module); + module_put(THIS_MODULE); + dev->use_count--; + } + mutex_unlock(&dev->mutex); + mutex_destroy(&dev->mutex); +} + +static bool comedi_clear_board_dev(struct comedi_device *dev) +{ + unsigned int i = dev->minor; + bool cleared = false; + + mutex_lock(&comedi_board_minor_table_lock); + if (dev == comedi_board_minor_table[i]) { + comedi_board_minor_table[i] = NULL; + cleared = true; + } + mutex_unlock(&comedi_board_minor_table_lock); + return cleared; +} + +static struct comedi_device *comedi_clear_board_minor(unsigned minor) +{ + struct comedi_device *dev; + + mutex_lock(&comedi_board_minor_table_lock); + dev = comedi_board_minor_table[minor]; + comedi_board_minor_table[minor] = NULL; + mutex_unlock(&comedi_board_minor_table_lock); + return dev; +} + +static void comedi_free_board_dev(struct comedi_device *dev) +{ + if (dev) { + if (dev->class_dev) { + device_destroy(comedi_class, + MKDEV(COMEDI_MAJOR, dev->minor)); + } + comedi_device_cleanup(dev); + kfree(dev); + } +} + +static struct comedi_subdevice +*comedi_subdevice_from_minor(unsigned minor) +{ + struct comedi_subdevice *s; + unsigned int i = minor - COMEDI_NUM_BOARD_MINORS; + + BUG_ON(i >= COMEDI_NUM_SUBDEVICE_MINORS); + mutex_lock(&comedi_subdevice_minor_table_lock); + s = comedi_subdevice_minor_table[i]; + mutex_unlock(&comedi_subdevice_minor_table_lock); + return s; +} + +static struct comedi_device *comedi_dev_from_board_minor(unsigned minor) +{ + struct comedi_device *dev; + + BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); + mutex_lock(&comedi_board_minor_table_lock); + dev = comedi_board_minor_table[minor]; + mutex_unlock(&comedi_board_minor_table_lock); + return dev; +} + +static struct comedi_device *comedi_dev_from_subdevice_minor(unsigned minor) +{ + struct comedi_subdevice *s; + + s = comedi_subdevice_from_minor(minor); + return s ? s->device : NULL; +} + +struct comedi_device *comedi_dev_from_minor(unsigned minor) +{ + if (minor < COMEDI_NUM_BOARD_MINORS) + return comedi_dev_from_board_minor(minor); + else + return comedi_dev_from_subdevice_minor(minor); +} +EXPORT_SYMBOL_GPL(comedi_dev_from_minor); + +static struct comedi_subdevice * +comedi_read_subdevice(const struct comedi_device *dev, unsigned int minor) +{ + struct comedi_subdevice *s; + + if (minor >= COMEDI_NUM_BOARD_MINORS) { + s = comedi_subdevice_from_minor(minor); + if (!s || s->device != dev) + return NULL; + if (s->subdev_flags & SDF_CMD_READ) + return s; + } + return dev->read_subdev; +} + +static struct comedi_subdevice * +comedi_write_subdevice(const struct comedi_device *dev, unsigned int minor) +{ + struct comedi_subdevice *s; + + if (minor >= COMEDI_NUM_BOARD_MINORS) { + s = comedi_subdevice_from_minor(minor); + if (!s || s->device != dev) + return NULL; + if (s->subdev_flags & SDF_CMD_WRITE) + return s; + } + return dev->write_subdev; +} + +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; + } + + /* 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, s->index, async->prealloc_bufsz); + return 0; +} + +/* sysfs attribute files */ + +static ssize_t show_max_read_buffer_kb(struct device *csdev, + struct device_attribute *attr, char *buf) +{ + unsigned int minor = MINOR(csdev->devt); + struct comedi_device *dev; + struct comedi_subdevice *s; + unsigned int size = 0; + + dev = comedi_dev_from_minor(minor); + if (!dev) + return -ENODEV; + + mutex_lock(&dev->mutex); + s = comedi_read_subdevice(dev, minor); + if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) + size = s->async->max_bufsize / 1024; + mutex_unlock(&dev->mutex); + + return snprintf(buf, PAGE_SIZE, "%i\n", size); +} + +static ssize_t store_max_read_buffer_kb(struct device *csdev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned int minor = MINOR(csdev->devt); + struct comedi_device *dev; + struct comedi_subdevice *s; + unsigned int size; + int err; + + err = kstrtouint(buf, 10, &size); + if (err) + return err; + if (size > (UINT_MAX / 1024)) + return -EINVAL; + size *= 1024; + + dev = comedi_dev_from_minor(minor); + if (!dev) + return -ENODEV; + + mutex_lock(&dev->mutex); + s = comedi_read_subdevice(dev, minor); + if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) + s->async->max_bufsize = size; + else + err = -EINVAL; + mutex_unlock(&dev->mutex); + + return err ? err : count; +} + +static ssize_t show_read_buffer_kb(struct device *csdev, + struct device_attribute *attr, char *buf) +{ + unsigned int minor = MINOR(csdev->devt); + struct comedi_device *dev; + struct comedi_subdevice *s; + unsigned int size = 0; + + dev = comedi_dev_from_minor(minor); + if (!dev) + return -ENODEV; + + mutex_lock(&dev->mutex); + s = comedi_read_subdevice(dev, minor); + if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) + size = s->async->prealloc_bufsz / 1024; + mutex_unlock(&dev->mutex); + + return snprintf(buf, PAGE_SIZE, "%i\n", size); +} + +static ssize_t store_read_buffer_kb(struct device *csdev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned int minor = MINOR(csdev->devt); + struct comedi_device *dev; + struct comedi_subdevice *s; + unsigned int size; + int err; + + err = kstrtouint(buf, 10, &size); + if (err) + return err; + if (size > (UINT_MAX / 1024)) + return -EINVAL; + size *= 1024; + + dev = comedi_dev_from_minor(minor); + if (!dev) + return -ENODEV; + + mutex_lock(&dev->mutex); + s = comedi_read_subdevice(dev, minor); + if (s && (s->subdev_flags & SDF_CMD_READ) && s->async) + err = resize_async_buffer(dev, s, s->async, size); + else + err = -EINVAL; + mutex_unlock(&dev->mutex); + + return err ? err : count; +} + +static ssize_t show_max_write_buffer_kb(struct device *csdev, + struct device_attribute *attr, + char *buf) +{ + unsigned int minor = MINOR(csdev->devt); + struct comedi_device *dev; + struct comedi_subdevice *s; + unsigned int size = 0; + + dev = comedi_dev_from_minor(minor); + if (!dev) + return -ENODEV; + + mutex_lock(&dev->mutex); + s = comedi_write_subdevice(dev, minor); + if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) + size = s->async->max_bufsize / 1024; + mutex_unlock(&dev->mutex); + + return snprintf(buf, PAGE_SIZE, "%i\n", size); +} + +static ssize_t store_max_write_buffer_kb(struct device *csdev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned int minor = MINOR(csdev->devt); + struct comedi_device *dev; + struct comedi_subdevice *s; + unsigned int size; + int err; + + err = kstrtouint(buf, 10, &size); + if (err) + return err; + if (size > (UINT_MAX / 1024)) + return -EINVAL; + size *= 1024; + + dev = comedi_dev_from_minor(minor); + if (!dev) + return -ENODEV; + + mutex_lock(&dev->mutex); + s = comedi_write_subdevice(dev, minor); + if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) + s->async->max_bufsize = size; + else + err = -EINVAL; + mutex_unlock(&dev->mutex); + + return err ? err : count; +} + +static ssize_t show_write_buffer_kb(struct device *csdev, + struct device_attribute *attr, char *buf) +{ + unsigned int minor = MINOR(csdev->devt); + struct comedi_device *dev; + struct comedi_subdevice *s; + unsigned int size = 0; + + dev = comedi_dev_from_minor(minor); + if (!dev) + return -ENODEV; + + mutex_lock(&dev->mutex); + s = comedi_write_subdevice(dev, minor); + if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) + size = s->async->prealloc_bufsz / 1024; + mutex_unlock(&dev->mutex); + + return snprintf(buf, PAGE_SIZE, "%i\n", size); +} + +static ssize_t store_write_buffer_kb(struct device *csdev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned int minor = MINOR(csdev->devt); + struct comedi_device *dev; + struct comedi_subdevice *s; + unsigned int size; + int err; + + err = kstrtouint(buf, 10, &size); + if (err) + return err; + if (size > (UINT_MAX / 1024)) + return -EINVAL; + size *= 1024; + + dev = comedi_dev_from_minor(minor); + if (!dev) + return -ENODEV; + + mutex_lock(&dev->mutex); + s = comedi_write_subdevice(dev, minor); + if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async) + err = resize_async_buffer(dev, s, s->async, size); + else + err = -EINVAL; + mutex_unlock(&dev->mutex); + + return err ? err : count; +} + +static struct device_attribute comedi_dev_attrs[] = { + __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR, + show_max_read_buffer_kb, store_max_read_buffer_kb), + __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP, + show_read_buffer_kb, store_read_buffer_kb), + __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR, + show_max_write_buffer_kb, store_max_write_buffer_kb), + __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP, + show_write_buffer_kb, store_write_buffer_kb), + __ATTR_NULL +}; + +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 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; +} + +bool comedi_is_subdevice_running(struct comedi_subdevice *s) +{ + unsigned runflags = comedi_get_subdevice_runflags(s); + + return (runflags & SRF_RUNNING) ? true : false; +} +EXPORT_SYMBOL_GPL(comedi_is_subdevice_running); + +static bool comedi_is_subdevice_in_error(struct comedi_subdevice *s) +{ + unsigned runflags = comedi_get_subdevice_runflags(s); + + return (runflags & SRF_ERROR) ? true : false; +} + +static bool comedi_is_subdevice_idle(struct comedi_subdevice *s) +{ + unsigned runflags = comedi_get_subdevice_runflags(s); + + return (runflags & (SRF_ERROR | SRF_RUNNING)) ? false : true; +} + +/* + This function restores a subdevice to an idle state. + */ +static 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_buf_reset(async); + async->inttrig = NULL; + kfree(async->cmd.chanlist); + async->cmd.chanlist = NULL; + } else { + dev_err(dev->class_dev, + "BUG: (?) do_become_nonbusy called with async=NULL\n"); + } + + s->busy = NULL; +} + +static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s) +{ + int ret = 0; + + if (comedi_is_subdevice_running(s) && s->cancel) + ret = s->cancel(dev, s); + + do_become_nonbusy(dev, s); + + return ret; +} + +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; +} + +/* + COMEDI_DEVCONFIG + device config ioctl + + arg: + pointer to devconfig structure + + reads: + devconfig structure at arg + + writes: + none +*/ +static int do_devconfig_ioctl(struct comedi_device *dev, + struct comedi_devconfig __user *arg) +{ + struct comedi_devconfig it; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (arg == NULL) { + if (is_device_busy(dev)) + return -EBUSY; + if (dev->attached) { + struct module *driver_module = dev->driver->module; + comedi_device_detach(dev); + module_put(driver_module); + } + return 0; + } + + if (copy_from_user(&it, arg, sizeof(it))) + return -EFAULT; + + it.board_name[COMEDI_NAMELEN - 1] = 0; + + if (it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) { + dev_warn(dev->class_dev, + "comedi_config --init_data is deprecated\n"); + return -EINVAL; + } + + if (dev->minor >= comedi_num_legacy_minors) + /* don't re-use dynamically allocated comedi devices */ + return -EBUSY; + + /* This increments the driver module count on success. */ + return comedi_device_attach(dev, &it); +} + +/* + COMEDI_BUFCONFIG + buffer configuration ioctl + + arg: + pointer to bufconfig structure + + reads: + bufconfig at arg + + writes: + modified bufconfig at arg + +*/ +static int do_bufconfig_ioctl(struct comedi_device *dev, + struct comedi_bufconfig __user *arg) +{ + struct comedi_bufconfig bc; + struct comedi_async *async; + struct comedi_subdevice *s; + int retval = 0; + + if (copy_from_user(&bc, arg, sizeof(bc))) + return -EFAULT; + + if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0) + return -EINVAL; + + s = &dev->subdevices[bc.subdevice]; + async = s->async; + + if (!async) { + DPRINTK("subdevice does not have async capability\n"); + bc.size = 0; + bc.maximum_size = 0; + goto copyback; + } + + if (bc.maximum_size) { + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + async->max_bufsize = bc.maximum_size; + } + + if (bc.size) { + retval = resize_async_buffer(dev, s, async, bc.size); + if (retval < 0) + return retval; + } + + bc.size = async->prealloc_bufsz; + bc.maximum_size = async->max_bufsize; + +copyback: + if (copy_to_user(arg, &bc, sizeof(bc))) + return -EFAULT; + + return 0; +} + +/* + COMEDI_DEVINFO + device info ioctl + + arg: + pointer to devinfo structure + + reads: + none + + writes: + devinfo structure + +*/ +static int do_devinfo_ioctl(struct comedi_device *dev, + struct comedi_devinfo __user *arg, + struct file *file) +{ + const unsigned minor = iminor(file_inode(file)); + struct comedi_subdevice *s; + struct comedi_devinfo devinfo; + + memset(&devinfo, 0, sizeof(devinfo)); + + /* fill devinfo structure */ + devinfo.version_code = COMEDI_VERSION_CODE; + devinfo.n_subdevs = dev->n_subdevices; + strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN); + strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN); + + s = comedi_read_subdevice(dev, minor); + if (s) + devinfo.read_subdevice = s->index; + else + devinfo.read_subdevice = -1; + + s = comedi_write_subdevice(dev, minor); + if (s) + devinfo.write_subdevice = s->index; + else + devinfo.write_subdevice = -1; + + if (copy_to_user(arg, &devinfo, sizeof(devinfo))) + return -EFAULT; + + return 0; +} + +/* + COMEDI_SUBDINFO + subdevice info ioctl + + arg: + pointer to array of subdevice info structures + + reads: + none + + writes: + array of subdevice info structures at arg + +*/ +static int do_subdinfo_ioctl(struct comedi_device *dev, + struct comedi_subdinfo __user *arg, void *file) +{ + int ret, i; + struct comedi_subdinfo *tmp, *us; + struct comedi_subdevice *s; + + tmp = kcalloc(dev->n_subdevices, sizeof(*tmp), GFP_KERNEL); + if (!tmp) + return -ENOMEM; + + /* fill subdinfo structs */ + for (i = 0; i < dev->n_subdevices; i++) { + s = &dev->subdevices[i]; + us = tmp + i; + + us->type = s->type; + us->n_chan = s->n_chan; + us->subd_flags = s->subdev_flags; + if (comedi_is_subdevice_running(s)) + us->subd_flags |= SDF_RUNNING; +#define TIMER_nanosec 5 /* backwards compatibility */ + us->timer_type = TIMER_nanosec; + us->len_chanlist = s->len_chanlist; + us->maxdata = s->maxdata; + if (s->range_table) { + us->range_type = + (i << 24) | (0 << 16) | (s->range_table->length); + } else { + us->range_type = 0; /* XXX */ + } + us->flags = s->flags; + + if (s->busy) + us->subd_flags |= SDF_BUSY; + if (s->busy == file) + us->subd_flags |= SDF_BUSY_OWNER; + if (s->lock) + us->subd_flags |= SDF_LOCKED; + if (s->lock == file) + us->subd_flags |= SDF_LOCK_OWNER; + if (!s->maxdata && s->maxdata_list) + 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) + 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(*tmp)); + + 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(it))) + 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(bi))) + 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_is_subdevice_idle(s) && + 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(bi))) + return -EFAULT; + + return 0; +} + +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; + case INSN_CONFIG_DIGITAL_TRIG: + if (insn->n == 6) + return 0; + break; + /* by default we allow the insn since we don't have checks for + * all possible cases yet */ + default: + pr_warn("comedi: No check for data length of config insn id %i is implemented.\n", + data[0]); + pr_warn("comedi: Add a check to %s in %s.\n", + __func__, __FILE__); + pr_warn("comedi: Assuming n=%i is correct.\n", insn->n); + return 0; + } + 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, 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_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(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(*insns), GFP_KERNEL); + if (!insns) { + DPRINTK("kmalloc failed\n"); + ret = -ENOMEM; + goto error; + } + + if (copy_from_user(insns, insnlist.insns, + sizeof(*insns) * 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; +} + +/* + * 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(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 int do_cmd_ioctl(struct comedi_device *dev, + struct comedi_cmd __user *arg, void *file) +{ + struct comedi_cmd cmd; + struct comedi_subdevice *s; + struct comedi_async *async; + int ret = 0; + unsigned int __user *user_chanlist; + + if (copy_from_user(&cmd, arg, sizeof(cmd))) { + DPRINTK("bad cmd address\n"); + return -EFAULT; + } + /* save user's chanlist pointer so it can be restored later */ + user_chanlist = (unsigned int __user *)cmd.chanlist; + + if (cmd.subdev >= dev->n_subdevices) { + DPRINTK("%d no such subdevice\n", cmd.subdev); + return -ENODEV; + } + + s = &dev->subdevices[cmd.subdev]; + async = s->async; + + if (s->type == COMEDI_SUBD_UNUSED) { + DPRINTK("%d not valid subdevice\n", cmd.subdev); + return -EIO; + } + + if (!s->do_cmd || !s->do_cmdtest || !s->async) { + DPRINTK("subdevice %i does not support commands\n", + 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; + } + + /* make sure channel/gain list isn't too long */ + if (cmd.chanlist_len > s->len_chanlist) { + DPRINTK("channel/gain list too long %u > %d\n", + cmd.chanlist_len, s->len_chanlist); + return -EINVAL; + } + + /* make sure channel/gain list isn't too short */ + if (cmd.chanlist_len < 1) { + DPRINTK("channel/gain list too short %u < 1\n", + cmd.chanlist_len); + return -EINVAL; + } + + async->cmd = 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"); + return -ENOMEM; + } + + if (copy_from_user(async->cmd.chanlist, user_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); + cmd = async->cmd; + /* restore chanlist pointer before copying back */ + cmd.chanlist = (unsigned int __force *)user_chanlist; + cmd.data = NULL; + if (copy_to_user(arg, &cmd, sizeof(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_buf_reset(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); + + /* set s->busy _after_ setting SRF_RUNNING flag to avoid race with + * comedi_read() or comedi_write() */ + s->busy = file; + 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 cmd; + struct comedi_subdevice *s; + int ret = 0; + unsigned int *chanlist = NULL; + unsigned int __user *user_chanlist; + + if (copy_from_user(&cmd, arg, sizeof(cmd))) { + DPRINTK("bad cmd address\n"); + return -EFAULT; + } + /* save user's chanlist pointer so it can be restored later */ + user_chanlist = (unsigned int __user *)cmd.chanlist; + + if (cmd.subdev >= dev->n_subdevices) { + DPRINTK("%d no such subdevice\n", cmd.subdev); + return -ENODEV; + } + + s = &dev->subdevices[cmd.subdev]; + if (s->type == COMEDI_SUBD_UNUSED) { + DPRINTK("%d not valid subdevice\n", cmd.subdev); + return -EIO; + } + + if (!s->do_cmd || !s->do_cmdtest) { + DPRINTK("subdevice %i does not support commands\n", + cmd.subdev); + return -EIO; + } + + /* make sure channel/gain list isn't too long */ + if (cmd.chanlist_len > s->len_chanlist) { + DPRINTK("channel/gain list too long %d > %d\n", + cmd.chanlist_len, s->len_chanlist); + ret = -EINVAL; + goto cleanup; + } + + /* load channel/gain list */ + if (cmd.chanlist) { + chanlist = + kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL); + if (!chanlist) { + DPRINTK("allocation failed\n"); + ret = -ENOMEM; + goto cleanup; + } + + if (copy_from_user(chanlist, user_chanlist, + 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, cmd.chanlist_len, chanlist); + if (ret < 0) { + DPRINTK("bad chanlist\n"); + goto cleanup; + } + + cmd.chanlist = chanlist; + } + + ret = s->do_cmdtest(dev, s, &cmd); + + /* restore chanlist pointer before copying back */ + cmd.chanlist = (unsigned int __force *)user_chanlist; + + if (copy_to_user(arg, &cmd, sizeof(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; + int ret; + + 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; + + ret = do_cancel(dev, s); + if (comedi_get_subdevice_runflags(s) & SRF_USER) + wake_up_interruptible(&s->async->wait_head); + + return ret; +} + +/* + 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 long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + const unsigned minor = iminor(file_inode(file)); + struct comedi_device *dev = comedi_dev_from_minor(minor); + int rc; + + if (!dev) + return -ENODEV; + + mutex_lock(&dev->mutex); + + /* Device config is special, because it must work on + * an unconfigured device. */ + if (cmd == COMEDI_DEVCONFIG) { + if (minor >= COMEDI_NUM_BOARD_MINORS) { + /* Device config not appropriate on non-board minors. */ + rc = -ENOTTY; + goto done; + } + rc = do_devconfig_ioctl(dev, + (struct comedi_devconfig __user *)arg); + if (rc == 0) { + if (arg == 0 && + dev->minor >= comedi_num_legacy_minors) { + /* Successfully unconfigured a dynamically + * allocated device. Try and remove it. */ + if (comedi_clear_board_dev(dev)) { + mutex_unlock(&dev->mutex); + comedi_free_board_dev(dev); + return rc; + } + } + } + goto done; + } + + if (!dev->attached) { + DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor); + rc = -ENODEV; + goto done; + } + + switch (cmd) { + case COMEDI_BUFCONFIG: + rc = do_bufconfig_ioctl(dev, + (struct comedi_bufconfig __user *)arg); + break; + case COMEDI_DEVINFO: + rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg, + file); + break; + case COMEDI_SUBDINFO: + rc = do_subdinfo_ioctl(dev, + (struct comedi_subdinfo __user *)arg, + file); + break; + case COMEDI_CHANINFO: + rc = do_chaninfo_ioctl(dev, (void __user *)arg); + break; + case COMEDI_RANGEINFO: + rc = do_rangeinfo_ioctl(dev, (void __user *)arg); + break; + case COMEDI_BUFINFO: + rc = do_bufinfo_ioctl(dev, + (struct comedi_bufinfo __user *)arg, + file); + break; + case COMEDI_LOCK: + rc = do_lock_ioctl(dev, arg, file); + break; + case COMEDI_UNLOCK: + rc = do_unlock_ioctl(dev, arg, file); + break; + case COMEDI_CANCEL: + rc = do_cancel_ioctl(dev, arg, file); + break; + case COMEDI_CMD: + rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file); + break; + case COMEDI_CMDTEST: + rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg, + file); + break; + case COMEDI_INSNLIST: + rc = do_insnlist_ioctl(dev, + (struct comedi_insnlist __user *)arg, + file); + break; + case COMEDI_INSN: + rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg, + file); + break; + case COMEDI_POLL: + rc = do_poll_ioctl(dev, arg, file); + break; + default: + rc = -ENOTTY; + break; + } + +done: + mutex_unlock(&dev->mutex); + return rc; +} + +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_inode(file)); + struct comedi_device *dev = comedi_dev_from_minor(minor); + struct comedi_subdevice *s; + struct comedi_async *async; + unsigned long start = vma->vm_start; + unsigned long size; + int n_pages; + int i; + int retval; + + if (!dev) + 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_write_subdevice(dev, minor); + else + s = comedi_read_subdevice(dev, minor); + if (!s) { + retval = -EINVAL; + goto done; + } + + async = s->async; + if (!async) { + 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) { + struct comedi_buf_page *buf = &async->buf_page_list[i]; + + if (remap_pfn_range(vma, start, + page_to_pfn(virt_to_page(buf->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_inode(file)); + struct comedi_device *dev = comedi_dev_from_minor(minor); + struct comedi_subdevice *s; + + if (!dev) + return -ENODEV; + + mutex_lock(&dev->mutex); + + if (!dev->attached) { + DPRINTK("no driver configured on comedi%i\n", dev->minor); + goto done; + } + + s = comedi_read_subdevice(dev, minor); + if (s && s->async) { + poll_wait(file, &s->async->wait_head, wait); + if (!s->busy || !comedi_is_subdevice_running(s) || + comedi_buf_read_n_available(s->async) > 0) + mask |= POLLIN | POLLRDNORM; + } + + s = comedi_write_subdevice(dev, minor); + if (s && s->async) { + unsigned int bps = bytes_per_sample(s->async->subdevice); + + poll_wait(file, &s->async->wait_head, wait); + comedi_buf_write_alloc(s->async, s->async->prealloc_bufsz); + if (!s->busy || !comedi_is_subdevice_running(s) || + comedi_buf_write_n_allocated(s->async) >= bps) + mask |= POLLOUT | POLLWRNORM; + } + +done: + 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_inode(file)); + struct comedi_device *dev = comedi_dev_from_minor(minor); + + if (!dev) + return -ENODEV; + + if (!dev->attached) { + DPRINTK("no driver configured on comedi%i\n", dev->minor); + return -ENODEV; + } + + s = comedi_write_subdevice(dev, minor); + if (!s || !s->async) + return -EIO; + + async = s->async; + + if (!s->busy || !nbytes) + return 0; + if (s->busy != file) + return -EACCES; + + add_wait_queue(&async->wait_head, &wait); + while (nbytes > 0 && !retval) { + set_current_state(TASK_INTERRUPTIBLE); + + if (!comedi_is_subdevice_running(s)) { + if (count == 0) { + mutex_lock(&dev->mutex); + if (comedi_is_subdevice_in_error(s)) + retval = -EPIPE; + else + retval = 0; + do_become_nonbusy(dev, s); + mutex_unlock(&dev->mutex); + } + 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); + + 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_inode(file)); + struct comedi_device *dev = comedi_dev_from_minor(minor); + + if (!dev) + return -ENODEV; + + if (!dev->attached) { + DPRINTK("no driver configured on comedi%i\n", dev->minor); + return -ENODEV; + } + + s = comedi_read_subdevice(dev, minor); + if (!s || !s->async) + return -EIO; + + async = s->async; + if (!s->busy || !nbytes) + return 0; + if (s->busy != file) + return -EACCES; + + 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_is_subdevice_running(s)) { + mutex_lock(&dev->mutex); + do_become_nonbusy(dev, s); + if (comedi_is_subdevice_in_error(s)) + retval = -EPIPE; + else + retval = 0; + mutex_unlock(&dev->mutex); + 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_is_subdevice_idle(s)) { + mutex_lock(&dev->mutex); + if (async->buf_read_count - async->buf_write_count == 0) + do_become_nonbusy(dev, s); + mutex_unlock(&dev->mutex); + } + set_current_state(TASK_RUNNING); + remove_wait_queue(&async->wait_head, &wait); + + return count ? count : retval; +} + +static int comedi_open(struct inode *inode, struct file *file) +{ + const unsigned minor = iminor(inode); + struct comedi_device *dev = comedi_dev_from_minor(minor); + + if (!dev) { + 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 -> autoload + * case: user opens device, unattached, in_request_module -> fail + * case: root opens device, attached -> ok + * case: root opens device, unattached, in_request_module -> ok + * (typically called from modprobe) + * case: root opens device, unattached, !in_request_module -> 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 = true; + +#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 = false; + + 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_fasync(int fd, struct file *file, int on) +{ + const unsigned minor = iminor(file_inode(file)); + struct comedi_device *dev = comedi_dev_from_minor(minor); + + if (!dev) + return -ENODEV; + + return fasync_helper(fd, file, on, &dev->async_queue); +} + +static int comedi_close(struct inode *inode, struct file *file) +{ + const unsigned minor = iminor(inode); + struct comedi_device *dev = comedi_dev_from_minor(minor); + struct comedi_subdevice *s = NULL; + int i; + + if (!dev) + 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 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, +}; + +void comedi_error(const struct comedi_device *dev, const char *s) +{ + dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s); +} +EXPORT_SYMBOL_GPL(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_is_subdevice_running(s)) + 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_GPL(comedi_event); + +/* Note: the ->mutex is pre-locked on successful return */ +struct comedi_device *comedi_alloc_board_minor(struct device *hardware_device) +{ + struct comedi_device *dev; + struct device *csdev; + unsigned i; + + dev = kzalloc(sizeof(struct comedi_device), GFP_KERNEL); + if (dev == NULL) + return ERR_PTR(-ENOMEM); + comedi_device_init(dev); + comedi_set_hw_dev(dev, hardware_device); + mutex_lock(&dev->mutex); + mutex_lock(&comedi_board_minor_table_lock); + for (i = hardware_device ? comedi_num_legacy_minors : 0; + i < COMEDI_NUM_BOARD_MINORS; ++i) { + if (comedi_board_minor_table[i] == NULL) { + comedi_board_minor_table[i] = dev; + break; + } + } + mutex_unlock(&comedi_board_minor_table_lock); + if (i == COMEDI_NUM_BOARD_MINORS) { + mutex_unlock(&dev->mutex); + comedi_device_cleanup(dev); + kfree(dev); + pr_err("comedi: error: ran out of minor numbers for board device files.\n"); + return ERR_PTR(-EBUSY); + } + dev->minor = i; + csdev = device_create(comedi_class, hardware_device, + MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i); + if (!IS_ERR(csdev)) + dev->class_dev = csdev; + + /* Note: dev->mutex needs to be unlocked by the caller. */ + return dev; +} + +static void comedi_free_board_minor(unsigned minor) +{ + BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS); + comedi_free_board_dev(comedi_clear_board_minor(minor)); +} + +void comedi_release_hardware_device(struct device *hardware_device) +{ + int minor; + struct comedi_device *dev; + + for (minor = comedi_num_legacy_minors; minor < COMEDI_NUM_BOARD_MINORS; + minor++) { + mutex_lock(&comedi_board_minor_table_lock); + dev = comedi_board_minor_table[minor]; + if (dev && dev->hw_dev == hardware_device) { + comedi_board_minor_table[minor] = NULL; + mutex_unlock(&comedi_board_minor_table_lock); + comedi_free_board_dev(dev); + break; + } + mutex_unlock(&comedi_board_minor_table_lock); + } +} + +int comedi_alloc_subdevice_minor(struct comedi_subdevice *s) +{ + struct comedi_device *dev = s->device; + struct device *csdev; + unsigned i; + + mutex_lock(&comedi_subdevice_minor_table_lock); + for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) { + if (comedi_subdevice_minor_table[i] == NULL) { + comedi_subdevice_minor_table[i] = s; + break; + } + } + mutex_unlock(&comedi_subdevice_minor_table_lock); + if (i == COMEDI_NUM_SUBDEVICE_MINORS) { + pr_err("comedi: error: ran out of minor numbers for subdevice files.\n"); + return -EBUSY; + } + i += COMEDI_NUM_BOARD_MINORS; + s->minor = i; + csdev = device_create(comedi_class, dev->class_dev, + MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i", + dev->minor, s->index); + if (!IS_ERR(csdev)) + s->class_dev = csdev; + + return 0; +} + +void comedi_free_subdevice_minor(struct comedi_subdevice *s) +{ + unsigned int i; + + if (s == NULL) + return; + if (s->minor < 0) + return; + + BUG_ON(s->minor >= COMEDI_NUM_MINORS); + BUG_ON(s->minor < COMEDI_NUM_BOARD_MINORS); + + i = s->minor - COMEDI_NUM_BOARD_MINORS; + mutex_lock(&comedi_subdevice_minor_table_lock); + if (s == comedi_subdevice_minor_table[i]) + comedi_subdevice_minor_table[i] = NULL; + mutex_unlock(&comedi_subdevice_minor_table_lock); + if (s->class_dev) { + device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor)); + s->class_dev = NULL; + } +} + +static void comedi_cleanup_board_minors(void) +{ + unsigned i; + + for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) + comedi_free_board_minor(i); +} + +static int __init comedi_init(void) +{ + int i; + int retval; + + pr_info("comedi: version " COMEDI_RELEASE " - http://www.comedi.org\n"); + + if (comedi_num_legacy_minors < 0 || + comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) { + pr_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; + } + + 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)) { + pr_err("comedi: failed to create class\n"); + cdev_del(&comedi_cdev); + unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), + COMEDI_NUM_MINORS); + return PTR_ERR(comedi_class); + } + + comedi_class->dev_attrs = comedi_dev_attrs; + + /* XXX requires /proc interface */ + comedi_proc_init(); + + /* create devices files for legacy/manual use */ + for (i = 0; i < comedi_num_legacy_minors; i++) { + struct comedi_device *dev; + dev = comedi_alloc_board_minor(NULL); + if (IS_ERR(dev)) { + comedi_cleanup_board_minors(); + cdev_del(&comedi_cdev); + unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), + COMEDI_NUM_MINORS); + return PTR_ERR(dev); + } else { + /* comedi_alloc_board_minor() locked the mutex */ + mutex_unlock(&dev->mutex); + } + } + + return 0; +} +module_init(comedi_init); + +static void __exit comedi_cleanup(void) +{ + int i; + + comedi_cleanup_board_minors(); + for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) + BUG_ON(comedi_board_minor_table[i]); + for (i = 0; i < COMEDI_NUM_SUBDEVICE_MINORS; ++i) + BUG_ON(comedi_subdevice_minor_table[i]); + + class_destroy(comedi_class); + cdev_del(&comedi_cdev); + unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS); + + comedi_proc_cleanup(); +} +module_exit(comedi_cleanup); + +MODULE_AUTHOR("http://www.comedi.org"); +MODULE_DESCRIPTION("Comedi core module"); +MODULE_LICENSE("GPL"); |