diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/comedi/comedi_fops.c | 659 |
1 files changed, 294 insertions, 365 deletions
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c index 06fc656..44ca1fe 100644 --- a/drivers/staging/comedi/comedi_fops.c +++ b/drivers/staging/comedi/comedi_fops.c @@ -129,15 +129,295 @@ static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s); static int comedi_fasync(int fd, struct file *file, int on); static int is_device_busy(struct comedi_device *dev); + static int resize_async_buffer(struct comedi_device *dev, struct comedi_subdevice *s, - struct comedi_async *async, unsigned new_size); + struct comedi_async *async, unsigned new_size) +{ + int retval; + + if (new_size > async->max_bufsize) + return -EPERM; + + if (s->busy) { + DPRINTK("subdevice is busy, cannot resize buffer\n"); + return -EBUSY; + } + if (async->mmap_count) { + DPRINTK("subdevice is mmapped, cannot resize buffer\n"); + return -EBUSY; + } + + if (!async->prealloc_buf) + return -EINVAL; -/* declarations for sysfs attribute files */ -static struct device_attribute dev_attr_max_read_buffer_kb; -static struct device_attribute dev_attr_read_buffer_kb; -static struct device_attribute dev_attr_max_write_buffer_kb; -static struct device_attribute dev_attr_write_buffer_kb; + /* make sure buffer is an integral number of pages + * (we round up) */ + new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; + + retval = comedi_buf_alloc(dev, s, new_size); + if (retval < 0) + return retval; + + if (s->buf_change) { + retval = s->buf_change(dev, s, new_size); + if (retval < 0) + return retval; + } + + DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", + dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz); + return 0; +} + +/* sysfs attribute files */ + +static const unsigned bytes_per_kibi = 1024; + +static ssize_t show_max_read_buffer_kb(struct device *dev, + struct device_attribute *attr, char *buf) +{ + ssize_t retval; + struct comedi_device_file_info *info = dev_get_drvdata(dev); + unsigned max_buffer_size_kb = 0; + struct comedi_subdevice *const read_subdevice = + comedi_get_read_subdevice(info); + + mutex_lock(&info->device->mutex); + if (read_subdevice && + (read_subdevice->subdev_flags & SDF_CMD_READ) && + read_subdevice->async) { + max_buffer_size_kb = read_subdevice->async->max_bufsize / + bytes_per_kibi; + } + retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); + mutex_unlock(&info->device->mutex); + + return retval; +} + +static ssize_t store_max_read_buffer_kb(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct comedi_device_file_info *info = dev_get_drvdata(dev); + unsigned int new_max_size_kb; + unsigned int new_max_size; + int ret; + struct comedi_subdevice *const read_subdevice = + comedi_get_read_subdevice(info); + + ret = kstrtouint(buf, 10, &new_max_size_kb); + if (ret) + return ret; + if (new_max_size_kb > (UINT_MAX / bytes_per_kibi)) + return -EINVAL; + new_max_size = new_max_size_kb * bytes_per_kibi; + + mutex_lock(&info->device->mutex); + if (read_subdevice == NULL || + (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || + read_subdevice->async == NULL) { + mutex_unlock(&info->device->mutex); + return -EINVAL; + } + read_subdevice->async->max_bufsize = new_max_size; + mutex_unlock(&info->device->mutex); + + return count; +} + +static DEVICE_ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR, + show_max_read_buffer_kb, store_max_read_buffer_kb); + +static ssize_t show_read_buffer_kb(struct device *dev, + struct device_attribute *attr, char *buf) +{ + ssize_t retval; + struct comedi_device_file_info *info = dev_get_drvdata(dev); + unsigned buffer_size_kb = 0; + struct comedi_subdevice *const read_subdevice = + comedi_get_read_subdevice(info); + + mutex_lock(&info->device->mutex); + if (read_subdevice && + (read_subdevice->subdev_flags & SDF_CMD_READ) && + read_subdevice->async) { + buffer_size_kb = read_subdevice->async->prealloc_bufsz / + bytes_per_kibi; + } + retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); + mutex_unlock(&info->device->mutex); + + return retval; +} + +static ssize_t store_read_buffer_kb(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct comedi_device_file_info *info = dev_get_drvdata(dev); + unsigned int new_size_kb; + unsigned int new_size; + int retval; + int ret; + struct comedi_subdevice *const read_subdevice = + comedi_get_read_subdevice(info); + + ret = kstrtouint(buf, 10, &new_size_kb); + if (ret) + return ret; + if (new_size_kb > (UINT_MAX / bytes_per_kibi)) + return -EINVAL; + new_size = new_size_kb * bytes_per_kibi; + + mutex_lock(&info->device->mutex); + if (read_subdevice == NULL || + (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || + read_subdevice->async == NULL) { + mutex_unlock(&info->device->mutex); + return -EINVAL; + } + retval = resize_async_buffer(info->device, read_subdevice, + read_subdevice->async, new_size); + mutex_unlock(&info->device->mutex); + + if (retval < 0) + return retval; + return count; +} + +static DEVICE_ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP, + show_read_buffer_kb, store_read_buffer_kb); + +static ssize_t show_max_write_buffer_kb(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + ssize_t retval; + struct comedi_device_file_info *info = dev_get_drvdata(dev); + unsigned max_buffer_size_kb = 0; + struct comedi_subdevice *const write_subdevice = + comedi_get_write_subdevice(info); + + mutex_lock(&info->device->mutex); + if (write_subdevice && + (write_subdevice->subdev_flags & SDF_CMD_WRITE) && + write_subdevice->async) { + max_buffer_size_kb = write_subdevice->async->max_bufsize / + bytes_per_kibi; + } + retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); + mutex_unlock(&info->device->mutex); + + return retval; +} + +static ssize_t store_max_write_buffer_kb(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct comedi_device_file_info *info = dev_get_drvdata(dev); + unsigned int new_max_size_kb; + unsigned int new_max_size; + int ret; + struct comedi_subdevice *const write_subdevice = + comedi_get_write_subdevice(info); + + ret = kstrtouint(buf, 10, &new_max_size_kb); + if (ret) + return ret; + if (new_max_size_kb > (UINT_MAX / bytes_per_kibi)) + return -EINVAL; + new_max_size = new_max_size_kb * bytes_per_kibi; + + mutex_lock(&info->device->mutex); + if (write_subdevice == NULL || + (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || + write_subdevice->async == NULL) { + mutex_unlock(&info->device->mutex); + return -EINVAL; + } + write_subdevice->async->max_bufsize = new_max_size; + mutex_unlock(&info->device->mutex); + + return count; +} + +static DEVICE_ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR, + show_max_write_buffer_kb, store_max_write_buffer_kb); + +static ssize_t show_write_buffer_kb(struct device *dev, + struct device_attribute *attr, char *buf) +{ + ssize_t retval; + struct comedi_device_file_info *info = dev_get_drvdata(dev); + unsigned buffer_size_kb = 0; + struct comedi_subdevice *const write_subdevice = + comedi_get_write_subdevice(info); + + mutex_lock(&info->device->mutex); + if (write_subdevice && + (write_subdevice->subdev_flags & SDF_CMD_WRITE) && + write_subdevice->async) { + buffer_size_kb = write_subdevice->async->prealloc_bufsz / + bytes_per_kibi; + } + retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); + mutex_unlock(&info->device->mutex); + + return retval; +} + +static ssize_t store_write_buffer_kb(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct comedi_device_file_info *info = dev_get_drvdata(dev); + unsigned int new_size_kb; + unsigned int new_size; + int retval; + int ret; + struct comedi_subdevice *const write_subdevice = + comedi_get_write_subdevice(info); + + ret = kstrtouint(buf, 10, &new_size_kb); + if (ret) + return ret; + if (new_size_kb > (UINT_MAX / bytes_per_kibi)) + return -EINVAL; + new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; + + mutex_lock(&info->device->mutex); + if (write_subdevice == NULL || + (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || + write_subdevice->async == NULL) { + mutex_unlock(&info->device->mutex); + return -EINVAL; + } + retval = resize_async_buffer(info->device, write_subdevice, + write_subdevice->async, new_size); + mutex_unlock(&info->device->mutex); + + if (retval < 0) + return retval; + return count; +} + +static DEVICE_ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP, + show_write_buffer_kb, store_write_buffer_kb); + +static struct attribute *comedi_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 +}; + +static const struct attribute_group comedi_sysfs_files = { + .attrs = comedi_attrs, +}; static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) @@ -2251,42 +2531,15 @@ int comedi_alloc_board_minor(struct device *hardware_device) if (!IS_ERR(csdev)) info->device->class_dev = csdev; dev_set_drvdata(csdev, info); - retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); - if (retval) { - printk(KERN_ERR - "comedi: " - "failed to create sysfs attribute file \"%s\".\n", - dev_attr_max_read_buffer_kb.attr.name); - comedi_free_board_minor(i); - return retval; - } - retval = device_create_file(csdev, &dev_attr_read_buffer_kb); - if (retval) { - printk(KERN_ERR - "comedi: " - "failed to create sysfs attribute file \"%s\".\n", - dev_attr_read_buffer_kb.attr.name); - comedi_free_board_minor(i); - return retval; - } - retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); - if (retval) { - printk(KERN_ERR - "comedi: " - "failed to create sysfs attribute file \"%s\".\n", - dev_attr_max_write_buffer_kb.attr.name); - comedi_free_board_minor(i); - return retval; - } - retval = device_create_file(csdev, &dev_attr_write_buffer_kb); + + retval = sysfs_create_group(&csdev->kobj, &comedi_sysfs_files); if (retval) { printk(KERN_ERR - "comedi: " - "failed to create sysfs attribute file \"%s\".\n", - dev_attr_write_buffer_kb.attr.name); + "comedi: failed to create sysfs attribute files\n"); comedi_free_board_minor(i); return retval; } + return i; } @@ -2367,42 +2620,15 @@ int comedi_alloc_subdevice_minor(struct comedi_device *dev, if (!IS_ERR(csdev)) s->class_dev = csdev; dev_set_drvdata(csdev, info); - retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb); - if (retval) { - printk(KERN_ERR - "comedi: " - "failed to create sysfs attribute file \"%s\".\n", - dev_attr_max_read_buffer_kb.attr.name); - comedi_free_subdevice_minor(s); - return retval; - } - retval = device_create_file(csdev, &dev_attr_read_buffer_kb); - if (retval) { - printk(KERN_ERR - "comedi: " - "failed to create sysfs attribute file \"%s\".\n", - dev_attr_read_buffer_kb.attr.name); - comedi_free_subdevice_minor(s); - return retval; - } - retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb); - if (retval) { - printk(KERN_ERR - "comedi: " - "failed to create sysfs attribute file \"%s\".\n", - dev_attr_max_write_buffer_kb.attr.name); - comedi_free_subdevice_minor(s); - return retval; - } - retval = device_create_file(csdev, &dev_attr_write_buffer_kb); + + retval = sysfs_create_group(&csdev->kobj, &comedi_sysfs_files); if (retval) { printk(KERN_ERR - "comedi: " - "failed to create sysfs attribute file \"%s\".\n", - dev_attr_write_buffer_kb.attr.name); + "comedi: failed to create sysfs attribute files\n"); comedi_free_subdevice_minor(s); return retval; } + return i; } @@ -2441,300 +2667,3 @@ struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor) return info; } EXPORT_SYMBOL_GPL(comedi_get_device_file_info); - -static int resize_async_buffer(struct comedi_device *dev, - struct comedi_subdevice *s, - struct comedi_async *async, unsigned new_size) -{ - int retval; - - if (new_size > async->max_bufsize) - return -EPERM; - - if (s->busy) { - DPRINTK("subdevice is busy, cannot resize buffer\n"); - return -EBUSY; - } - if (async->mmap_count) { - DPRINTK("subdevice is mmapped, cannot resize buffer\n"); - return -EBUSY; - } - - if (!async->prealloc_buf) - return -EINVAL; - - /* make sure buffer is an integral number of pages - * (we round up) */ - new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK; - - retval = comedi_buf_alloc(dev, s, new_size); - if (retval < 0) - return retval; - - if (s->buf_change) { - retval = s->buf_change(dev, s, new_size); - if (retval < 0) - return retval; - } - - DPRINTK("comedi%i subd %d buffer resized to %i bytes\n", - dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz); - return 0; -} - -/* sysfs attribute files */ - -static const unsigned bytes_per_kibi = 1024; - -static ssize_t show_max_read_buffer_kb(struct device *dev, - struct device_attribute *attr, char *buf) -{ - ssize_t retval; - struct comedi_device_file_info *info = dev_get_drvdata(dev); - unsigned max_buffer_size_kb = 0; - struct comedi_subdevice *const read_subdevice = - comedi_get_read_subdevice(info); - - mutex_lock(&info->device->mutex); - if (read_subdevice && - (read_subdevice->subdev_flags & SDF_CMD_READ) && - read_subdevice->async) { - max_buffer_size_kb = read_subdevice->async->max_bufsize / - bytes_per_kibi; - } - retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); - mutex_unlock(&info->device->mutex); - - return retval; -} - -static ssize_t store_max_read_buffer_kb(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - struct comedi_device_file_info *info = dev_get_drvdata(dev); - unsigned int new_max_size_kb; - unsigned int new_max_size; - int ret; - struct comedi_subdevice *const read_subdevice = - comedi_get_read_subdevice(info); - - ret = kstrtouint(buf, 10, &new_max_size_kb); - if (ret) - return ret; - if (new_max_size_kb > (UINT_MAX / bytes_per_kibi)) - return -EINVAL; - new_max_size = new_max_size_kb * bytes_per_kibi; - - mutex_lock(&info->device->mutex); - if (read_subdevice == NULL || - (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || - read_subdevice->async == NULL) { - mutex_unlock(&info->device->mutex); - return -EINVAL; - } - read_subdevice->async->max_bufsize = new_max_size; - mutex_unlock(&info->device->mutex); - - return count; -} - -static struct device_attribute dev_attr_max_read_buffer_kb = { - .attr = { - .name = "max_read_buffer_kb", - .mode = S_IRUGO | S_IWUSR}, - .show = &show_max_read_buffer_kb, - .store = &store_max_read_buffer_kb -}; - -static ssize_t show_read_buffer_kb(struct device *dev, - struct device_attribute *attr, char *buf) -{ - ssize_t retval; - struct comedi_device_file_info *info = dev_get_drvdata(dev); - unsigned buffer_size_kb = 0; - struct comedi_subdevice *const read_subdevice = - comedi_get_read_subdevice(info); - - mutex_lock(&info->device->mutex); - if (read_subdevice && - (read_subdevice->subdev_flags & SDF_CMD_READ) && - read_subdevice->async) { - buffer_size_kb = read_subdevice->async->prealloc_bufsz / - bytes_per_kibi; - } - retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); - mutex_unlock(&info->device->mutex); - - return retval; -} - -static ssize_t store_read_buffer_kb(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - struct comedi_device_file_info *info = dev_get_drvdata(dev); - unsigned int new_size_kb; - unsigned int new_size; - int retval; - int ret; - struct comedi_subdevice *const read_subdevice = - comedi_get_read_subdevice(info); - - ret = kstrtouint(buf, 10, &new_size_kb); - if (ret) - return ret; - if (new_size_kb > (UINT_MAX / bytes_per_kibi)) - return -EINVAL; - new_size = new_size_kb * bytes_per_kibi; - - mutex_lock(&info->device->mutex); - if (read_subdevice == NULL || - (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 || - read_subdevice->async == NULL) { - mutex_unlock(&info->device->mutex); - return -EINVAL; - } - retval = resize_async_buffer(info->device, read_subdevice, - read_subdevice->async, new_size); - mutex_unlock(&info->device->mutex); - - if (retval < 0) - return retval; - return count; -} - -static struct device_attribute dev_attr_read_buffer_kb = { - .attr = { - .name = "read_buffer_kb", - .mode = S_IRUGO | S_IWUSR | S_IWGRP}, - .show = &show_read_buffer_kb, - .store = &store_read_buffer_kb -}; - -static ssize_t show_max_write_buffer_kb(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - ssize_t retval; - struct comedi_device_file_info *info = dev_get_drvdata(dev); - unsigned max_buffer_size_kb = 0; - struct comedi_subdevice *const write_subdevice = - comedi_get_write_subdevice(info); - - mutex_lock(&info->device->mutex); - if (write_subdevice && - (write_subdevice->subdev_flags & SDF_CMD_WRITE) && - write_subdevice->async) { - max_buffer_size_kb = write_subdevice->async->max_bufsize / - bytes_per_kibi; - } - retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb); - mutex_unlock(&info->device->mutex); - - return retval; -} - -static ssize_t store_max_write_buffer_kb(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - struct comedi_device_file_info *info = dev_get_drvdata(dev); - unsigned int new_max_size_kb; - unsigned int new_max_size; - int ret; - struct comedi_subdevice *const write_subdevice = - comedi_get_write_subdevice(info); - - ret = kstrtouint(buf, 10, &new_max_size_kb); - if (ret) - return ret; - if (new_max_size_kb > (UINT_MAX / bytes_per_kibi)) - return -EINVAL; - new_max_size = new_max_size_kb * bytes_per_kibi; - - mutex_lock(&info->device->mutex); - if (write_subdevice == NULL || - (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || - write_subdevice->async == NULL) { - mutex_unlock(&info->device->mutex); - return -EINVAL; - } - write_subdevice->async->max_bufsize = new_max_size; - mutex_unlock(&info->device->mutex); - - return count; -} - -static struct device_attribute dev_attr_max_write_buffer_kb = { - .attr = { - .name = "max_write_buffer_kb", - .mode = S_IRUGO | S_IWUSR}, - .show = &show_max_write_buffer_kb, - .store = &store_max_write_buffer_kb -}; - -static ssize_t show_write_buffer_kb(struct device *dev, - struct device_attribute *attr, char *buf) -{ - ssize_t retval; - struct comedi_device_file_info *info = dev_get_drvdata(dev); - unsigned buffer_size_kb = 0; - struct comedi_subdevice *const write_subdevice = - comedi_get_write_subdevice(info); - - mutex_lock(&info->device->mutex); - if (write_subdevice && - (write_subdevice->subdev_flags & SDF_CMD_WRITE) && - write_subdevice->async) { - buffer_size_kb = write_subdevice->async->prealloc_bufsz / - bytes_per_kibi; - } - retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb); - mutex_unlock(&info->device->mutex); - - return retval; -} - -static ssize_t store_write_buffer_kb(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - struct comedi_device_file_info *info = dev_get_drvdata(dev); - unsigned int new_size_kb; - unsigned int new_size; - int retval; - int ret; - struct comedi_subdevice *const write_subdevice = - comedi_get_write_subdevice(info); - - ret = kstrtouint(buf, 10, &new_size_kb); - if (ret) - return ret; - if (new_size_kb > (UINT_MAX / bytes_per_kibi)) - return -EINVAL; - new_size = ((uint64_t) new_size_kb) * bytes_per_kibi; - - mutex_lock(&info->device->mutex); - if (write_subdevice == NULL || - (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 || - write_subdevice->async == NULL) { - mutex_unlock(&info->device->mutex); - return -EINVAL; - } - retval = resize_async_buffer(info->device, write_subdevice, - write_subdevice->async, new_size); - mutex_unlock(&info->device->mutex); - - if (retval < 0) - return retval; - return count; -} - -static struct device_attribute dev_attr_write_buffer_kb = { - .attr = { - .name = "write_buffer_kb", - .mode = S_IRUGO | S_IWUSR | S_IWGRP}, - .show = &show_write_buffer_kb, - .store = &store_write_buffer_kb -}; 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