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- /*
- * 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.
- */
- #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
- #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/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"
- /*
- * comedi_subdevice "runflags"
- * COMEDI_SRF_RT: DEPRECATED: command is running real-time
- * COMEDI_SRF_ERROR: indicates an COMEDI_CB_ERROR event has occurred
- * since the last command was started
- * COMEDI_SRF_RUNNING: command is running
- * COMEDI_SRF_FREE_SPRIV: free s->private on detach
- *
- * COMEDI_SRF_BUSY_MASK: runflags that indicate the subdevice is "busy"
- */
- #define COMEDI_SRF_RT BIT(1)
- #define COMEDI_SRF_ERROR BIT(2)
- #define COMEDI_SRF_RUNNING BIT(27)
- #define COMEDI_SRF_FREE_SPRIV BIT(31)
- #define COMEDI_SRF_BUSY_MASK (COMEDI_SRF_ERROR | COMEDI_SRF_RUNNING)
- /**
- * struct comedi_file - Per-file private data for COMEDI device
- * @dev: COMEDI device.
- * @read_subdev: Current "read" subdevice.
- * @write_subdev: Current "write" subdevice.
- * @last_detach_count: Last known detach count.
- * @last_attached: Last known attached/detached state.
- */
- struct comedi_file {
- struct comedi_device *dev;
- struct comedi_subdevice *read_subdev;
- struct comedi_subdevice *write_subdev;
- unsigned int last_detach_count;
- bool last_attached:1;
- };
- #define COMEDI_NUM_MINORS 0x100
- #define COMEDI_NUM_SUBDEVICE_MINORS \
- (COMEDI_NUM_MINORS - COMEDI_NUM_BOARD_MINORS)
- 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)
- {
- kref_init(&dev->refcount);
- spin_lock_init(&dev->spinlock);
- mutex_init(&dev->mutex);
- init_rwsem(&dev->attach_lock);
- dev->minor = -1;
- }
- static void comedi_dev_kref_release(struct kref *kref)
- {
- struct comedi_device *dev =
- container_of(kref, struct comedi_device, refcount);
- mutex_destroy(&dev->mutex);
- put_device(dev->class_dev);
- kfree(dev);
- }
- /**
- * comedi_dev_put() - Release a use of a COMEDI device
- * @dev: COMEDI device.
- *
- * Must be called when a user of a COMEDI device is finished with it.
- * When the last user of the COMEDI device calls this function, the
- * COMEDI device is destroyed.
- *
- * Return: 1 if the COMEDI device is destroyed by this call or @dev is
- * NULL, otherwise return 0. Callers must not assume the COMEDI
- * device is still valid if this function returns 0.
- */
- int comedi_dev_put(struct comedi_device *dev)
- {
- if (dev)
- return kref_put(&dev->refcount, comedi_dev_kref_release);
- return 1;
- }
- EXPORT_SYMBOL_GPL(comedi_dev_put);
- static struct comedi_device *comedi_dev_get(struct comedi_device *dev)
- {
- if (dev)
- kref_get(&dev->refcount);
- return dev;
- }
- static void comedi_device_cleanup(struct comedi_device *dev)
- {
- struct module *driver_module = NULL;
- if (!dev)
- return;
- mutex_lock(&dev->mutex);
- if (dev->attached)
- driver_module = dev->driver->module;
- comedi_device_detach(dev);
- if (driver_module && dev->use_count)
- module_put(driver_module);
- mutex_unlock(&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) {
- comedi_device_cleanup(dev);
- if (dev->class_dev) {
- device_destroy(comedi_class,
- MKDEV(COMEDI_MAJOR, dev->minor));
- }
- comedi_dev_put(dev);
- }
- }
- static struct comedi_subdevice
- *comedi_subdevice_from_minor(const struct comedi_device *dev, unsigned minor)
- {
- struct comedi_subdevice *s;
- unsigned int i = minor - COMEDI_NUM_BOARD_MINORS;
- mutex_lock(&comedi_subdevice_minor_table_lock);
- s = comedi_subdevice_minor_table[i];
- if (s && s->device != dev)
- s = NULL;
- mutex_unlock(&comedi_subdevice_minor_table_lock);
- return s;
- }
- static struct comedi_device *comedi_dev_get_from_board_minor(unsigned minor)
- {
- struct comedi_device *dev;
- mutex_lock(&comedi_board_minor_table_lock);
- dev = comedi_dev_get(comedi_board_minor_table[minor]);
- mutex_unlock(&comedi_board_minor_table_lock);
- return dev;
- }
- static struct comedi_device *comedi_dev_get_from_subdevice_minor(unsigned minor)
- {
- struct comedi_device *dev;
- struct comedi_subdevice *s;
- unsigned int i = minor - COMEDI_NUM_BOARD_MINORS;
- mutex_lock(&comedi_subdevice_minor_table_lock);
- s = comedi_subdevice_minor_table[i];
- dev = comedi_dev_get(s ? s->device : NULL);
- mutex_unlock(&comedi_subdevice_minor_table_lock);
- return dev;
- }
- /**
- * comedi_dev_get_from_minor() - Get COMEDI device by minor device number
- * @minor: Minor device number.
- *
- * Finds the COMEDI device associated with the minor device number, if any,
- * and increments its reference count. The COMEDI device is prevented from
- * being freed until a matching call is made to comedi_dev_put().
- *
- * Return: A pointer to the COMEDI device if it exists, with its usage
- * reference incremented. Return NULL if no COMEDI device exists with the
- * specified minor device number.
- */
- struct comedi_device *comedi_dev_get_from_minor(unsigned minor)
- {
- if (minor < COMEDI_NUM_BOARD_MINORS)
- return comedi_dev_get_from_board_minor(minor);
- return comedi_dev_get_from_subdevice_minor(minor);
- }
- EXPORT_SYMBOL_GPL(comedi_dev_get_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(dev, minor);
- if (!s || (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(dev, minor);
- if (!s || (s->subdev_flags & SDF_CMD_WRITE))
- return s;
- }
- return dev->write_subdev;
- }
- static void comedi_file_reset(struct file *file)
- {
- struct comedi_file *cfp = file->private_data;
- struct comedi_device *dev = cfp->dev;
- struct comedi_subdevice *s, *read_s, *write_s;
- unsigned int minor = iminor(file_inode(file));
- read_s = dev->read_subdev;
- write_s = dev->write_subdev;
- if (minor >= COMEDI_NUM_BOARD_MINORS) {
- s = comedi_subdevice_from_minor(dev, minor);
- if (!s || s->subdev_flags & SDF_CMD_READ)
- read_s = s;
- if (!s || s->subdev_flags & SDF_CMD_WRITE)
- write_s = s;
- }
- cfp->last_attached = dev->attached;
- cfp->last_detach_count = dev->detach_count;
- ACCESS_ONCE(cfp->read_subdev) = read_s;
- ACCESS_ONCE(cfp->write_subdev) = write_s;
- }
- static void comedi_file_check(struct file *file)
- {
- struct comedi_file *cfp = file->private_data;
- struct comedi_device *dev = cfp->dev;
- if (cfp->last_attached != dev->attached ||
- cfp->last_detach_count != dev->detach_count)
- comedi_file_reset(file);
- }
- static struct comedi_subdevice *comedi_file_read_subdevice(struct file *file)
- {
- struct comedi_file *cfp = file->private_data;
- comedi_file_check(file);
- return ACCESS_ONCE(cfp->read_subdev);
- }
- static struct comedi_subdevice *comedi_file_write_subdevice(struct file *file)
- {
- struct comedi_file *cfp = file->private_data;
- comedi_file_check(file);
- return ACCESS_ONCE(cfp->write_subdev);
- }
- static int resize_async_buffer(struct comedi_device *dev,
- struct comedi_subdevice *s, unsigned new_size)
- {
- struct comedi_async *async = s->async;
- int retval;
- if (new_size > async->max_bufsize)
- return -EPERM;
- if (s->busy) {
- dev_dbg(dev->class_dev,
- "subdevice is busy, cannot resize buffer\n");
- return -EBUSY;
- }
- if (comedi_buf_is_mmapped(s)) {
- dev_dbg(dev->class_dev,
- "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);
- if (retval < 0)
- return retval;
- }
- dev_dbg(dev->class_dev, "subd %d buffer resized to %i bytes\n",
- s->index, async->prealloc_bufsz);
- return 0;
- }
- /* sysfs attribute files */
- static ssize_t max_read_buffer_kb_show(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_get_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);
- comedi_dev_put(dev);
- return snprintf(buf, PAGE_SIZE, "%u\n", size);
- }
- static ssize_t max_read_buffer_kb_store(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_get_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);
- comedi_dev_put(dev);
- return err ? err : count;
- }
- static DEVICE_ATTR_RW(max_read_buffer_kb);
- static ssize_t read_buffer_kb_show(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_get_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);
- comedi_dev_put(dev);
- return snprintf(buf, PAGE_SIZE, "%u\n", size);
- }
- static ssize_t read_buffer_kb_store(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_get_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, size);
- else
- err = -EINVAL;
- mutex_unlock(&dev->mutex);
- comedi_dev_put(dev);
- return err ? err : count;
- }
- static DEVICE_ATTR_RW(read_buffer_kb);
- static ssize_t max_write_buffer_kb_show(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_get_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);
- comedi_dev_put(dev);
- return snprintf(buf, PAGE_SIZE, "%u\n", size);
- }
- static ssize_t max_write_buffer_kb_store(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_get_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);
- comedi_dev_put(dev);
- return err ? err : count;
- }
- static DEVICE_ATTR_RW(max_write_buffer_kb);
- static ssize_t write_buffer_kb_show(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_get_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);
- comedi_dev_put(dev);
- return snprintf(buf, PAGE_SIZE, "%u\n", size);
- }
- static ssize_t write_buffer_kb_store(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_get_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, size);
- else
- err = -EINVAL;
- mutex_unlock(&dev->mutex);
- comedi_dev_put(dev);
- return err ? err : count;
- }
- static DEVICE_ATTR_RW(write_buffer_kb);
- static struct attribute *comedi_dev_attrs[] = {
- &dev_attr_max_read_buffer_kb.attr,
- &dev_attr_read_buffer_kb.attr,
- &dev_attr_max_write_buffer_kb.attr,
- &dev_attr_write_buffer_kb.attr,
- NULL,
- };
- ATTRIBUTE_GROUPS(comedi_dev);
- static void __comedi_clear_subdevice_runflags(struct comedi_subdevice *s,
- unsigned bits)
- {
- s->runflags &= ~bits;
- }
- static void __comedi_set_subdevice_runflags(struct comedi_subdevice *s,
- unsigned bits)
- {
- s->runflags |= bits;
- }
- static void comedi_update_subdevice_runflags(struct comedi_subdevice *s,
- unsigned mask, unsigned bits)
- {
- unsigned long flags;
- spin_lock_irqsave(&s->spin_lock, flags);
- __comedi_clear_subdevice_runflags(s, mask);
- __comedi_set_subdevice_runflags(s, bits & mask);
- spin_unlock_irqrestore(&s->spin_lock, flags);
- }
- static unsigned __comedi_get_subdevice_runflags(struct comedi_subdevice *s)
- {
- return s->runflags;
- }
- static unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
- {
- unsigned long flags;
- unsigned runflags;
- spin_lock_irqsave(&s->spin_lock, flags);
- runflags = __comedi_get_subdevice_runflags(s);
- spin_unlock_irqrestore(&s->spin_lock, flags);
- return runflags;
- }
- static bool comedi_is_runflags_running(unsigned runflags)
- {
- return runflags & COMEDI_SRF_RUNNING;
- }
- static bool comedi_is_runflags_in_error(unsigned runflags)
- {
- return runflags & COMEDI_SRF_ERROR;
- }
- /**
- * comedi_is_subdevice_running() - Check if async command running on subdevice
- * @s: COMEDI subdevice.
- *
- * Return: %true if an asynchronous COMEDI command is active on the
- * subdevice, else %false.
- */
- bool comedi_is_subdevice_running(struct comedi_subdevice *s)
- {
- unsigned runflags = comedi_get_subdevice_runflags(s);
- return comedi_is_runflags_running(runflags);
- }
- EXPORT_SYMBOL_GPL(comedi_is_subdevice_running);
- static bool __comedi_is_subdevice_running(struct comedi_subdevice *s)
- {
- unsigned runflags = __comedi_get_subdevice_runflags(s);
- return comedi_is_runflags_running(runflags);
- }
- static bool comedi_is_subdevice_idle(struct comedi_subdevice *s)
- {
- unsigned runflags = comedi_get_subdevice_runflags(s);
- return !(runflags & COMEDI_SRF_BUSY_MASK);
- }
- bool comedi_can_auto_free_spriv(struct comedi_subdevice *s)
- {
- unsigned runflags = __comedi_get_subdevice_runflags(s);
- return runflags & COMEDI_SRF_FREE_SPRIV;
- }
- /**
- * comedi_set_spriv_auto_free() - Mark subdevice private data as freeable
- * @s: COMEDI subdevice.
- *
- * Mark the subdevice as having a pointer to private data that can be
- * automatically freed when the COMEDI device is detached from the low-level
- * driver.
- */
- void comedi_set_spriv_auto_free(struct comedi_subdevice *s)
- {
- __comedi_set_subdevice_runflags(s, COMEDI_SRF_FREE_SPRIV);
- }
- EXPORT_SYMBOL_GPL(comedi_set_spriv_auto_free);
- /**
- * comedi_alloc_spriv - Allocate memory for the subdevice private data
- * @s: COMEDI subdevice.
- * @size: Size of the memory to allocate.
- *
- * Allocate memory for the subdevice private data and point @s->private
- * to it. The memory will be freed automatically when the COMEDI device
- * is detached from the low-level driver.
- *
- * Return: A pointer to the allocated memory @s->private on success.
- * Return NULL on failure.
- */
- void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size)
- {
- s->private = kzalloc(size, GFP_KERNEL);
- if (s->private)
- comedi_set_spriv_auto_free(s);
- return s->private;
- }
- EXPORT_SYMBOL_GPL(comedi_alloc_spriv);
- /*
- * 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_update_subdevice_runflags(s, COMEDI_SRF_RUNNING, 0);
- if (async) {
- comedi_buf_reset(s);
- async->inttrig = NULL;
- kfree(async->cmd.chanlist);
- async->cmd.chanlist = NULL;
- s->busy = NULL;
- wake_up_interruptible_all(&async->wait_head);
- } 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;
- }
- void comedi_device_cancel_all(struct comedi_device *dev)
- {
- struct comedi_subdevice *s;
- int i;
- if (!dev->attached)
- return;
- for (i = 0; i < dev->n_subdevices; i++) {
- s = &dev->subdevices[i];
- if (s->async)
- do_cancel(dev, s);
- }
- }
- 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 && comedi_buf_is_mmapped(s))
- return 1;
- }
- return 0;
- }
- /*
- * COMEDI_DEVCONFIG ioctl
- * attaches (and configures) or detaches a legacy device
- *
- * arg:
- * pointer to comedi_devconfig structure (NULL if detaching)
- *
- * reads:
- * comedi_devconfig structure (if attaching)
- *
- * writes:
- * nothing
- */
- 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) {
- 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 ioctl
- * buffer configuration
- *
- * arg:
- * pointer to comedi_bufconfig structure
- *
- * reads:
- * comedi_bufconfig structure
- *
- * writes:
- * modified comedi_bufconfig structure
- */
- 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)
- return -EINVAL;
- s = &dev->subdevices[bc.subdevice];
- async = s->async;
- if (!async) {
- dev_dbg(dev->class_dev,
- "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, 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 ioctl
- * device info
- *
- * arg:
- * pointer to comedi_devinfo structure
- *
- * reads:
- * nothing
- *
- * writes:
- * comedi_devinfo structure
- */
- static int do_devinfo_ioctl(struct comedi_device *dev,
- struct comedi_devinfo __user *arg,
- struct file *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_file_read_subdevice(file);
- if (s)
- devinfo.read_subdevice = s->index;
- else
- devinfo.read_subdevice = -1;
- s = comedi_file_write_subdevice(file);
- 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 ioctl
- * subdevices info
- *
- * arg:
- * pointer to array of comedi_subdinfo structures
- *
- * reads:
- * nothing
- *
- * writes:
- * array of comedi_subdinfo structures
- */
- 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 */
- }
- 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->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;
- }
- ret = copy_to_user(arg, tmp, dev->n_subdevices * sizeof(*tmp));
- kfree(tmp);
- return ret ? -EFAULT : 0;
- }
- /*
- * COMEDI_CHANINFO ioctl
- * subdevice channel info
- *
- * arg:
- * pointer to comedi_chaninfo structure
- *
- * reads:
- * comedi_chaninfo structure
- *
- * writes:
- * array of maxdata values to chaninfo->maxdata_list if requested
- * array of range table lengths to chaninfo->range_table_list if requested
- */
- 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)
- return -EINVAL; /* flaglist not supported */
- 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;
- }
- }
- return 0;
- }
- /*
- * COMEDI_BUFINFO ioctl
- * buffer information
- *
- * arg:
- * pointer to comedi_bufinfo structure
- *
- * reads:
- * comedi_bufinfo structure
- *
- * writes:
- * modified comedi_bufinfo structure
- */
- 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)
- return -EINVAL;
- s = &dev->subdevices[bi.subdevice];
- async = s->async;
- if (!async) {
- dev_dbg(dev->class_dev,
- "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 && !(async->cmd.flags & CMDF_WRITE)) {
- bi.bytes_read = comedi_buf_read_alloc(s, bi.bytes_read);
- comedi_buf_read_free(s, bi.bytes_read);
- if (comedi_is_subdevice_idle(s) &&
- comedi_buf_read_n_available(s) == 0) {
- do_become_nonbusy(dev, s);
- }
- }
- if (bi.bytes_written && (async->cmd.flags & CMDF_WRITE)) {
- bi.bytes_written =
- comedi_buf_write_alloc(s, bi.bytes_written);
- comedi_buf_write_free(s, 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("No check for data length of config insn id %i is implemented\n",
- data[0]);
- pr_warn("Add a check to %s in %s\n", __func__, __FILE__);
- pr_warn("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) {
- dev_dbg(dev->class_dev,
- "%d not usable subdevice\n",
- insn->subdev);
- ret = -EINVAL;
- break;
- }
- s = &dev->subdevices[insn->subdev];
- if (!s->async) {
- dev_dbg(dev->class_dev, "no async\n");
- ret = -EINVAL;
- break;
- }
- if (!s->async->inttrig) {
- dev_dbg(dev->class_dev, "no inttrig\n");
- ret = -EAGAIN;
- break;
- }
- ret = s->async->inttrig(dev, s, data[0]);
- if (ret >= 0)
- ret = 1;
- break;
- default:
- dev_dbg(dev->class_dev, "invalid insn\n");
- ret = -EINVAL;
- break;
- }
- } else {
- /* a subdevice instruction */
- unsigned int maxdata;
- if (insn->subdev >= dev->n_subdevices) {
- dev_dbg(dev->class_dev, "subdevice %d out of range\n",
- insn->subdev);
- ret = -EINVAL;
- goto out;
- }
- s = &dev->subdevices[insn->subdev];
- if (s->type == COMEDI_SUBD_UNUSED) {
- dev_dbg(dev->class_dev, "%d not usable subdevice\n",
- insn->subdev);
- ret = -EIO;
- goto out;
- }
- /* are we locked? (ioctl lock) */
- if (s->lock && s->lock != file) {
- dev_dbg(dev->class_dev, "device locked\n");
- ret = -EACCES;
- goto out;
- }
- ret = comedi_check_chanlist(s, 1, &insn->chanspec);
- if (ret < 0) {
- ret = -EINVAL;
- dev_dbg(dev->class_dev, "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);
- if (ret == -ETIMEDOUT) {
- dev_dbg(dev->class_dev,
- "subdevice %d read instruction timed out\n",
- s->index);
- }
- 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;
- dev_dbg(dev->class_dev,
- "bad data value(s)\n");
- break;
- }
- }
- if (ret == 0) {
- ret = s->insn_write(dev, s, insn, data);
- if (ret == -ETIMEDOUT) {
- dev_dbg(dev->class_dev,
- "subdevice %d write instruction timed out\n",
- s->index);
- }
- }
- 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 orig_mask = data[0];
- unsigned int shift = 0;
- if (s->n_chan <= 32) {
- shift = CR_CHAN(insn->chanspec);
- if (shift > 0) {
- insn->chanspec = 0;
- data[0] <<= shift;
- data[1] <<= shift;
- }
- }
- 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 ioctl
- * synchronous instruction list
- *
- * arg:
- * pointer to comedi_insnlist structure
- *
- * reads:
- * comedi_insnlist structure
- * array of comedi_insn structures from insnlist->insns pointer
- * data (for writes) from insns[].data pointers
- *
- * writes:
- * data (for reads) to insns[].data pointers
- */
- /* 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_array(MAX_SAMPLES, sizeof(unsigned int), GFP_KERNEL);
- if (!data) {
- ret = -ENOMEM;
- goto error;
- }
- insns = kcalloc(insnlist.n_insns, sizeof(*insns), GFP_KERNEL);
- if (!insns) {
- ret = -ENOMEM;
- goto error;
- }
- if (copy_from_user(insns, insnlist.insns,
- sizeof(*insns) * insnlist.n_insns)) {
- dev_dbg(dev->class_dev, "copy_from_user failed\n");
- ret = -EFAULT;
- goto error;
- }
- for (i = 0; i < insnlist.n_insns; i++) {
- if (insns[i].n > MAX_SAMPLES) {
- dev_dbg(dev->class_dev,
- "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))) {
- dev_dbg(dev->class_dev,
- "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))) {
- dev_dbg(dev->class_dev,
- "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 ioctl
- * synchronous instruction
- *
- * arg:
- * pointer to comedi_insn structure
- *
- * reads:
- * comedi_insn structure
- * data (for writes) from insn->data pointer
- *
- * writes:
- * data (for reads) to insn->data pointer
- */
- 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_array(MAX_SAMPLES, sizeof(unsigned int), 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 __comedi_get_user_cmd(struct comedi_device *dev,
- struct comedi_cmd __user *arg,
- struct comedi_cmd *cmd)
- {
- struct comedi_subdevice *s;
- if (copy_from_user(cmd, arg, sizeof(*cmd))) {
- dev_dbg(dev->class_dev, "bad cmd address\n");
- return -EFAULT;
- }
- if (cmd->subdev >= dev->n_subdevices) {
- dev_dbg(dev->class_dev, "%d no such subdevice\n", cmd->subdev);
- return -ENODEV;
- }
- s = &dev->subdevices[cmd->subdev];
- if (s->type == COMEDI_SUBD_UNUSED) {
- dev_dbg(dev->class_dev, "%d not valid subdevice\n",
- cmd->subdev);
- return -EIO;
- }
- if (!s->do_cmd || !s->do_cmdtest || !s->async) {
- dev_dbg(dev->class_dev,
- "subdevice %d 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) {
- dev_dbg(dev->class_dev, "channel/gain list too long %d > %d\n",
- cmd->chanlist_len, s->len_chanlist);
- return -EINVAL;
- }
- /*
- * Set the CMDF_WRITE flag to the correct state if the subdevice
- * supports only "read" commands or only "write" commands.
- */
- switch (s->subdev_flags & (SDF_CMD_READ | SDF_CMD_WRITE)) {
- case SDF_CMD_READ:
- cmd->flags &= ~CMDF_WRITE;
- break;
- case SDF_CMD_WRITE:
- cmd->flags |= CMDF_WRITE;
- break;
- default:
- break;
- }
- return 0;
- }
- static int __comedi_get_user_chanlist(struct comedi_device *dev,
- struct comedi_subdevice *s,
- unsigned int __user *user_chanlist,
- struct comedi_cmd *cmd)
- {
- unsigned int *chanlist;
- int ret;
- cmd->chanlist = NULL;
- chanlist = memdup_user(user_chanlist,
- cmd->chanlist_len * sizeof(unsigned int));
- if (IS_ERR(chanlist))
- return PTR_ERR(chanlist);
- /* make sure each element in channel/gain list is valid */
- ret = comedi_check_chanlist(s, cmd->chanlist_len, chanlist);
- if (ret < 0) {
- kfree(chanlist);
- return ret;
- }
- cmd->chanlist = chanlist;
- return 0;
- }
- /*
- * COMEDI_CMD ioctl
- * asynchronous acquisition command set-up
- *
- * arg:
- * pointer to comedi_cmd structure
- *
- * reads:
- * comedi_cmd structure
- * channel/range list from cmd->chanlist pointer
- *
- * writes:
- * possibly modified comedi_cmd structure (when -EAGAIN returned)
- */
- 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;
- unsigned int __user *user_chanlist;
- int ret;
- /* get the user's cmd and do some simple validation */
- ret = __comedi_get_user_cmd(dev, arg, &cmd);
- if (ret)
- return ret;
- /* save user's chanlist pointer so it can be restored later */
- user_chanlist = (unsigned int __user *)cmd.chanlist;
- s = &dev->subdevices[cmd.subdev];
- async = s->async;
- /* are we locked? (ioctl lock) */
- if (s->lock && s->lock != file) {
- dev_dbg(dev->class_dev, "subdevice locked\n");
- return -EACCES;
- }
- /* are we busy? */
- if (s->busy) {
- dev_dbg(dev->class_dev, "subdevice busy\n");
- return -EBUSY;
- }
- /* make sure channel/gain list isn't too short */
- if (cmd.chanlist_len < 1) {
- dev_dbg(dev->class_dev, "channel/gain list too short %u < 1\n",
- cmd.chanlist_len);
- return -EINVAL;
- }
- async->cmd = cmd;
- async->cmd.data = NULL;
- /* load channel/gain list */
- ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &async->cmd);
- if (ret)
- goto cleanup;
- ret = s->do_cmdtest(dev, s, &async->cmd);
- if (async->cmd.flags & CMDF_BOGUS || ret) {
- dev_dbg(dev->class_dev, "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))) {
- dev_dbg(dev->class_dev, "fault writing cmd\n");
- ret = -EFAULT;
- goto cleanup;
- }
- ret = -EAGAIN;
- goto cleanup;
- }
- if (!async->prealloc_bufsz) {
- ret = -ENOMEM;
- dev_dbg(dev->class_dev, "no buffer (?)\n");
- goto cleanup;
- }
- comedi_buf_reset(s);
- async->cb_mask = COMEDI_CB_BLOCK | COMEDI_CB_CANCEL_MASK;
- if (async->cmd.flags & CMDF_WAKE_EOS)
- async->cb_mask |= COMEDI_CB_EOS;
- comedi_update_subdevice_runflags(s, COMEDI_SRF_BUSY_MASK,
- COMEDI_SRF_RUNNING);
- /*
- * Set s->busy _after_ setting COMEDI_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 ioctl
- * asynchronous acquisition command testing
- *
- * arg:
- * pointer to comedi_cmd structure
- *
- * reads:
- * comedi_cmd structure
- * channel/range list from cmd->chanlist pointer
- *
- * writes:
- * possibly modified comedi_cmd structure
- */
- static int do_cmdtest_ioctl(struct comedi_device *dev,
- struct comedi_cmd __user *arg, void *file)
- {
- struct comedi_cmd cmd;
- struct comedi_subdevice *s;
- unsigned int __user *user_chanlist;
- int ret;
- /* get the user's cmd and do some simple validation */
- ret = __comedi_get_user_cmd(dev, arg, &cmd);
- if (ret)
- return ret;
- /* save user's chanlist pointer so it can be restored later */
- user_chanlist = (unsigned int __user *)cmd.chanlist;
- s = &dev->subdevices[cmd.subdev];
- /* user_chanlist can be NULL for COMEDI_CMDTEST ioctl */
- if (user_chanlist) {
- /* load channel/gain list */
- ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &cmd);
- if (ret)
- return ret;
- }
- ret = s->do_cmdtest(dev, s, &cmd);
- kfree(cmd.chanlist); /* free kernel copy of user chanlist */
- /* restore chanlist pointer before copying back */
- cmd.chanlist = (unsigned int __force *)user_chanlist;
- if (copy_to_user(arg, &cmd, sizeof(cmd))) {
- dev_dbg(dev->class_dev, "bad cmd address\n");
- ret = -EFAULT;
- }
- return ret;
- }
- /*
- * COMEDI_LOCK ioctl
- * lock subdevice
- *
- * arg:
- * subdevice number
- *
- * reads:
- * nothing
- *
- * writes:
- * nothing
- */
- static int do_lock_ioctl(struct comedi_device *dev, unsigned long 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);
- return ret;
- }
- /*
- * COMEDI_UNLOCK ioctl
- * unlock subdevice
- *
- * arg:
- * subdevice number
- *
- * reads:
- * nothing
- *
- * writes:
- * nothing
- */
- static int do_unlock_ioctl(struct comedi_device *dev, unsigned long 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)
- s->lock = NULL;
- return 0;
- }
- /*
- * COMEDI_CANCEL ioctl
- * cancel asynchronous acquisition
- *
- * arg:
- * subdevice number
- *
- * reads:
- * nothing
- *
- * writes:
- * nothing
- */
- static int do_cancel_ioctl(struct comedi_device *dev, unsigned long arg,
- void *file)
- {
- struct comedi_subdevice *s;
- if (arg >= dev->n_subdevices)
- return -EINVAL;
- s = &dev->subdevices[arg];
- if (!s->async)
- return -EINVAL;
- 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 long arg,
- void *file)
- {
- struct comedi_subdevice *s;
- if (arg >= dev->n_subdevices)
- return -EINVAL;
- s = &dev->subdevices[arg];
- if (!s->busy)
- return 0;
- if (s->busy != file)
- return -EBUSY;
- if (s->poll)
- return s->poll(dev, s);
- return -EINVAL;
- }
- /*
- * COMEDI_SETRSUBD ioctl
- * sets the current "read" subdevice on a per-file basis
- *
- * arg:
- * subdevice number
- *
- * reads:
- * nothing
- *
- * writes:
- * nothing
- */
- static int do_setrsubd_ioctl(struct comedi_device *dev, unsigned long arg,
- struct file *file)
- {
- struct comedi_file *cfp = file->private_data;
- struct comedi_subdevice *s_old, *s_new;
- if (arg >= dev->n_subdevices)
- return -EINVAL;
- s_new = &dev->subdevices[arg];
- s_old = comedi_file_read_subdevice(file);
- if (s_old == s_new)
- return 0; /* no change */
- if (!(s_new->subdev_flags & SDF_CMD_READ))
- return -EINVAL;
- /*
- * Check the file isn't still busy handling a "read" command on the
- * old subdevice (if any).
- */
- if (s_old && s_old->busy == file && s_old->async &&
- !(s_old->async->cmd.flags & CMDF_WRITE))
- return -EBUSY;
- ACCESS_ONCE(cfp->read_subdev) = s_new;
- return 0;
- }
- /*
- * COMEDI_SETWSUBD ioctl
- * sets the current "write" subdevice on a per-file basis
- *
- * arg:
- * subdevice number
- *
- * reads:
- * nothing
- *
- * writes:
- * nothing
- */
- static int do_setwsubd_ioctl(struct comedi_device *dev, unsigned long arg,
- struct file *file)
- {
- struct comedi_file *cfp = file->private_data;
- struct comedi_subdevice *s_old, *s_new;
- if (arg >= dev->n_subdevices)
- return -EINVAL;
- s_new = &dev->subdevices[arg];
- s_old = comedi_file_write_subdevice(file);
- if (s_old == s_new)
- return 0; /* no change */
- if (!(s_new->subdev_flags & SDF_CMD_WRITE))
- return -EINVAL;
- /*
- * Check the file isn't still busy handling a "write" command on the
- * old subdevice (if any).
- */
- if (s_old && s_old->busy == file && s_old->async &&
- (s_old->async->cmd.flags & CMDF_WRITE))
- return -EBUSY;
- ACCESS_ONCE(cfp->write_subdev) = s_new;
- return 0;
- }
- static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
- {
- unsigned minor = iminor(file_inode(file));
- struct comedi_file *cfp = file->private_data;
- struct comedi_device *dev = cfp->dev;
- int rc;
- 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) {
- dev_dbg(dev->class_dev, "no driver attached\n");
- 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;
- case COMEDI_SETRSUBD:
- rc = do_setrsubd_ioctl(dev, arg, file);
- break;
- case COMEDI_SETWSUBD:
- rc = do_setwsubd_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_buf_map *bm;
- bm = area->vm_private_data;
- comedi_buf_map_get(bm);
- }
- static void comedi_vm_close(struct vm_area_struct *area)
- {
- struct comedi_buf_map *bm;
- bm = area->vm_private_data;
- comedi_buf_map_put(bm);
- }
- static const 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)
- {
- struct comedi_file *cfp = file->private_data;
- struct comedi_device *dev = cfp->dev;
- struct comedi_subdevice *s;
- struct comedi_async *async;
- struct comedi_buf_map *bm = NULL;
- unsigned long start = vma->vm_start;
- unsigned long size;
- int n_pages;
- int i;
- int retval;
- /*
- * 'trylock' avoids circular dependency with current->mm->mmap_sem
- * and down-reading &dev->attach_lock should normally succeed without
- * contention unless the device is in the process of being attached
- * or detached.
- */
- if (!down_read_trylock(&dev->attach_lock))
- return -EAGAIN;
- if (!dev->attached) {
- dev_dbg(dev->class_dev, "no driver attached\n");
- retval = -ENODEV;
- goto done;
- }
- if (vma->vm_flags & VM_WRITE)
- s = comedi_file_write_subdevice(file);
- else
- s = comedi_file_read_subdevice(file);
- if (!s) {
- retval = -EINVAL;
- goto done;
- }
- async = s->async;
- if (!async) {
- retval = -EINVAL;
- goto done;
- }
- if (vma->vm_pgoff != 0) {
- dev_dbg(dev->class_dev, "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;
- /* get reference to current buf map (if any) */
- bm = comedi_buf_map_from_subdev_get(s);
- if (!bm || n_pages > bm->n_pages) {
- retval = -EINVAL;
- goto done;
- }
- for (i = 0; i < n_pages; ++i) {
- struct comedi_buf_page *buf = &bm->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 = bm;
- vma->vm_ops->open(vma);
- retval = 0;
- done:
- up_read(&dev->attach_lock);
- comedi_buf_map_put(bm); /* put reference to buf map - okay if NULL */
- return retval;
- }
- static unsigned int comedi_poll(struct file *file, poll_table *wait)
- {
- unsigned int mask = 0;
- struct comedi_file *cfp = file->private_data;
- struct comedi_device *dev = cfp->dev;
- struct comedi_subdevice *s, *s_read;
- down_read(&dev->attach_lock);
- if (!dev->attached) {
- dev_dbg(dev->class_dev, "no driver attached\n");
- goto done;
- }
- s = comedi_file_read_subdevice(file);
- s_read = s;
- if (s && s->async) {
- poll_wait(file, &s->async->wait_head, wait);
- if (s->busy != file || !comedi_is_subdevice_running(s) ||
- (s->async->cmd.flags & CMDF_WRITE) ||
- comedi_buf_read_n_available(s) > 0)
- mask |= POLLIN | POLLRDNORM;
- }
- s = comedi_file_write_subdevice(file);
- if (s && s->async) {
- unsigned int bps = comedi_bytes_per_sample(s);
- if (s != s_read)
- poll_wait(file, &s->async->wait_head, wait);
- if (s->busy != file || !comedi_is_subdevice_running(s) ||
- !(s->async->cmd.flags & CMDF_WRITE) ||
- comedi_buf_write_n_available(s) >= bps)
- mask |= POLLOUT | POLLWRNORM;
- }
- done:
- up_read(&dev->attach_lock);
- 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);
- struct comedi_file *cfp = file->private_data;
- struct comedi_device *dev = cfp->dev;
- bool on_wait_queue = false;
- bool attach_locked;
- unsigned int old_detach_count;
- /* Protect against device detachment during operation. */
- down_read(&dev->attach_lock);
- attach_locked = true;
- old_detach_count = dev->detach_count;
- if (!dev->attached) {
- dev_dbg(dev->class_dev, "no driver attached\n");
- retval = -ENODEV;
- goto out;
- }
- s = comedi_file_write_subdevice(file);
- if (!s || !s->async) {
- retval = -EIO;
- goto out;
- }
- async = s->async;
- if (!s->busy || !nbytes)
- goto out;
- if (s->busy != file) {
- retval = -EACCES;
- goto out;
- }
- if (!(async->cmd.flags & CMDF_WRITE)) {
- retval = -EINVAL;
- goto out;
- }
- add_wait_queue(&async->wait_head, &wait);
- on_wait_queue = true;
- while (nbytes > 0 && !retval) {
- unsigned runflags;
- set_current_state(TASK_INTERRUPTIBLE);
- runflags = comedi_get_subdevice_runflags(s);
- if (!comedi_is_runflags_running(runflags)) {
- if (count == 0) {
- struct comedi_subdevice *new_s;
- if (comedi_is_runflags_in_error(runflags))
- retval = -EPIPE;
- else
- retval = 0;
- /*
- * To avoid deadlock, cannot acquire dev->mutex
- * while dev->attach_lock is held. Need to
- * remove task from the async wait queue before
- * releasing dev->attach_lock, as it might not
- * be valid afterwards.
- */
- remove_wait_queue(&async->wait_head, &wait);
- on_wait_queue = false;
- up_read(&dev->attach_lock);
- attach_locked = false;
- mutex_lock(&dev->mutex);
- /*
- * Become non-busy unless things have changed
- * behind our back. Checking dev->detach_count
- * is unchanged ought to be sufficient (unless
- * there have been 2**32 detaches in the
- * meantime!), but check the subdevice pointer
- * as well just in case.
- */
- new_s = comedi_file_write_subdevice(file);
- if (dev->attached &&
- old_detach_count == dev->detach_count &&
- s == new_s && new_s->async == async)
- 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(s, async->prealloc_bufsz);
- if (m > comedi_buf_write_n_allocated(s))
- m = comedi_buf_write_n_allocated(s);
- 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;
- }
- if (!(async->cmd.flags & CMDF_WRITE)) {
- retval = -EINVAL;
- 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(s, n);
- count += n;
- nbytes -= n;
- buf += n;
- break; /* makes device work like a pipe */
- }
- out:
- if (on_wait_queue)
- remove_wait_queue(&async->wait_head, &wait);
- set_current_state(TASK_RUNNING);
- if (attach_locked)
- up_read(&dev->attach_lock);
- 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;
- unsigned int n, m;
- ssize_t count = 0;
- int retval = 0;
- DECLARE_WAITQUEUE(wait, current);
- struct comedi_file *cfp = file->private_data;
- struct comedi_device *dev = cfp->dev;
- unsigned int old_detach_count;
- bool become_nonbusy = false;
- bool attach_locked;
- /* Protect against device detachment during operation. */
- down_read(&dev->attach_lock);
- attach_locked = true;
- old_detach_count = dev->detach_count;
- if (!dev->attached) {
- dev_dbg(dev->class_dev, "no driver attached\n");
- retval = -ENODEV;
- goto out;
- }
- s = comedi_file_read_subdevice(file);
- if (!s || !s->async) {
- retval = -EIO;
- goto out;
- }
- async = s->async;
- if (s->busy != file || (async->cmd.flags & CMDF_WRITE)) {
- retval = -EINVAL;
- goto out;
- }
- add_wait_queue(&async->wait_head, &wait);
- while (count == 0 && !retval) {
- unsigned int rp, n1, n2;
- set_current_state(TASK_INTERRUPTIBLE);
- m = comedi_buf_read_n_available(s);
- n = min_t(size_t, m, nbytes);
- if (n == 0) {
- unsigned runflags = comedi_get_subdevice_runflags(s);
- if (!comedi_is_runflags_running(runflags)) {
- if (comedi_is_runflags_in_error(runflags))
- retval = -EPIPE;
- if (retval || nbytes)
- become_nonbusy = true;
- break;
- }
- if (nbytes == 0)
- break;
- if (file->f_flags & O_NONBLOCK) {
- retval = -EAGAIN;
- break;
- }
- schedule();
- if (signal_pending(current)) {
- retval = -ERESTARTSYS;
- break;
- }
- if (s->busy != file ||
- (async->cmd.flags & CMDF_WRITE)) {
- retval = -EINVAL;
- break;
- }
- continue;
- }
- rp = async->buf_read_ptr;
- n1 = min(n, async->prealloc_bufsz - rp);
- n2 = n - n1;
- m = copy_to_user(buf, async->prealloc_buf + rp, n1);
- if (m)
- m += n2;
- else if (n2)
- m = copy_to_user(buf + n1, async->prealloc_buf, n2);
- if (m) {
- n -= m;
- retval = -EFAULT;
- }
- comedi_buf_read_alloc(s, n);
- comedi_buf_read_free(s, n);
- count += n;
- nbytes -= n;
- buf += n;
- }
- remove_wait_queue(&async->wait_head, &wait);
- set_current_state(TASK_RUNNING);
- if (become_nonbusy && count == 0) {
- struct comedi_subdevice *new_s;
- /*
- * To avoid deadlock, cannot acquire dev->mutex
- * while dev->attach_lock is held.
- */
- up_read(&dev->attach_lock);
- attach_locked = false;
- mutex_lock(&dev->mutex);
- /*
- * Check device hasn't become detached behind our back.
- * Checking dev->detach_count is unchanged ought to be
- * sufficient (unless there have been 2**32 detaches in the
- * meantime!), but check the subdevice pointer as well just in
- * case.
- *
- * Also check the subdevice is still in a suitable state to
- * become non-busy in case it changed behind our back.
- */
- new_s = comedi_file_read_subdevice(file);
- if (dev->attached && old_detach_count == dev->detach_count &&
- s == new_s && new_s->async == async && s->busy == file &&
- !(async->cmd.flags & CMDF_WRITE) &&
- !comedi_is_subdevice_running(s) &&
- comedi_buf_read_n_available(s) == 0)
- do_become_nonbusy(dev, s);
- mutex_unlock(&dev->mutex);
- }
- out:
- if (attach_locked)
- up_read(&dev->attach_lock);
- return count ? count : retval;
- }
- static int comedi_open(struct inode *inode, struct file *file)
- {
- const unsigned minor = iminor(inode);
- struct comedi_file *cfp;
- struct comedi_device *dev = comedi_dev_get_from_minor(minor);
- int rc;
- if (!dev) {
- pr_debug("invalid minor number\n");
- return -ENODEV;
- }
- cfp = kzalloc(sizeof(*cfp), GFP_KERNEL);
- if (!cfp)
- return -ENOMEM;
- cfp->dev = dev;
- mutex_lock(&dev->mutex);
- if (!dev->attached && !capable(CAP_SYS_ADMIN)) {
- dev_dbg(dev->class_dev, "not attached and not CAP_SYS_ADMIN\n");
- rc = -ENODEV;
- goto out;
- }
- if (dev->attached && dev->use_count == 0) {
- if (!try_module_get(dev->driver->module)) {
- rc = -ENXIO;
- goto out;
- }
- if (dev->open) {
- rc = dev->open(dev);
- if (rc < 0) {
- module_put(dev->driver->module);
- goto out;
- }
- }
- }
- dev->use_count++;
- file->private_data = cfp;
- comedi_file_reset(file);
- rc = 0;
- out:
- mutex_unlock(&dev->mutex);
- if (rc) {
- comedi_dev_put(dev);
- kfree(cfp);
- }
- return rc;
- }
- static int comedi_fasync(int fd, struct file *file, int on)
- {
- struct comedi_file *cfp = file->private_data;
- struct comedi_device *dev = cfp->dev;
- return fasync_helper(fd, file, on, &dev->async_queue);
- }
- static int comedi_close(struct inode *inode, struct file *file)
- {
- struct comedi_file *cfp = file->private_data;
- struct comedi_device *dev = cfp->dev;
- struct comedi_subdevice *s = NULL;
- int i;
- mutex_lock(&dev->mutex);
- if (dev->subdevices) {
- for (i = 0; i < dev->n_subdevices; i++) {
- s = &dev->subdevices[i];
- if (s->busy == file)
- do_cancel(dev, s);
- if (s->lock == file)
- s->lock = NULL;
- }
- }
- if (dev->attached && dev->use_count == 1) {
- if (dev->close)
- dev->close(dev);
- module_put(dev->driver->module);
- }
- dev->use_count--;
- mutex_unlock(&dev->mutex);
- comedi_dev_put(dev);
- kfree(cfp);
- 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,
- };
- /**
- * comedi_event() - Handle events for asynchronous COMEDI command
- * @dev: COMEDI device.
- * @s: COMEDI subdevice.
- * Context: in_interrupt() (usually), @s->spin_lock spin-lock not held.
- *
- * If an asynchronous COMEDI command is active on the subdevice, process
- * any %COMEDI_CB_... event flags that have been set, usually by an
- * interrupt handler. These may change the run state of the asynchronous
- * command, wake a task, and/or send a %SIGIO signal.
- */
- void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
- {
- struct comedi_async *async = s->async;
- unsigned int events;
- int si_code = 0;
- unsigned long flags;
- spin_lock_irqsave(&s->spin_lock, flags);
- events = async->events;
- async->events = 0;
- if (!__comedi_is_subdevice_running(s)) {
- spin_unlock_irqrestore(&s->spin_lock, flags);
- return;
- }
- if (events & COMEDI_CB_CANCEL_MASK)
- __comedi_clear_subdevice_runflags(s, COMEDI_SRF_RUNNING);
- /*
- * Remember if an error event has occurred, so an error can be
- * returned the next time the user does a read() or write().
- */
- if (events & COMEDI_CB_ERROR_MASK)
- __comedi_set_subdevice_runflags(s, COMEDI_SRF_ERROR);
- if (async->cb_mask & events) {
- wake_up_interruptible(&async->wait_head);
- si_code = async->cmd.flags & CMDF_WRITE ? POLL_OUT : POLL_IN;
- }
- spin_unlock_irqrestore(&s->spin_lock, flags);
- if (si_code)
- kill_fasync(&dev->async_queue, SIGIO, si_code);
- }
- 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(*dev), GFP_KERNEL);
- if (!dev)
- 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]) {
- 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);
- comedi_dev_put(dev);
- dev_err(hardware_device,
- "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 = get_device(csdev);
- /* Note: dev->mutex needs to be unlocked by the caller. */
- return dev;
- }
- 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]) {
- comedi_subdevice_minor_table[i] = s;
- break;
- }
- }
- mutex_unlock(&comedi_subdevice_minor_table_lock);
- if (i == COMEDI_NUM_SUBDEVICE_MINORS) {
- dev_err(dev->class_dev,
- "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)
- return;
- if (s->minor < COMEDI_NUM_BOARD_MINORS ||
- s->minor >= COMEDI_NUM_MINORS)
- return;
- 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)
- {
- struct comedi_device *dev;
- unsigned i;
- for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
- dev = comedi_clear_board_minor(i);
- comedi_free_board_dev(dev);
- }
- }
- static int __init comedi_init(void)
- {
- int i;
- int retval;
- pr_info("version " COMEDI_RELEASE " - http://www.comedi.org\n");
- if (comedi_num_legacy_minors < 0 ||
- comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
- pr_err("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;
- retval = kobject_set_name(&comedi_cdev.kobj, "comedi");
- if (retval) {
- unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
- COMEDI_NUM_MINORS);
- return retval;
- }
- 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("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_groups = comedi_dev_groups;
- /* 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();
- class_destroy(comedi_class);
- cdev_del(&comedi_cdev);
- unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
- COMEDI_NUM_MINORS);
- return PTR_ERR(dev);
- }
- /* comedi_alloc_board_minor() locked the mutex */
- mutex_unlock(&dev->mutex);
- }
- /* XXX requires /proc interface */
- comedi_proc_init();
- return 0;
- }
- module_init(comedi_init);
- static void __exit comedi_cleanup(void)
- {
- comedi_cleanup_board_minors();
- 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");
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