return sprintf(buf, "%d\n", ret);
}
+/* Note NULL used as error indicator as it doesn't make sense. */
+static const unsigned long *iio_scan_mask_match(const unsigned long *av_masks,
+ unsigned int masklength,
+ const unsigned long *mask)
+{
+ if (bitmap_empty(mask, masklength))
+ return NULL;
+ while (*av_masks) {
+ if (bitmap_subset(mask, av_masks, masklength))
+ return av_masks;
+ av_masks += BITS_TO_LONGS(masklength);
+ }
+ return NULL;
+}
+
+static bool iio_validate_scan_mask(struct iio_dev *indio_dev,
+ const unsigned long *mask)
+{
+ if (!indio_dev->setup_ops->validate_scan_mask)
+ return true;
+
+ return indio_dev->setup_ops->validate_scan_mask(indio_dev, mask);
+}
+
+/**
+ * iio_scan_mask_set() - set particular bit in the scan mask
+ * @indio_dev: the iio device
+ * @buffer: the buffer whose scan mask we are interested in
+ * @bit: the bit to be set.
+ *
+ * Note that at this point we have no way of knowing what other
+ * buffers might request, hence this code only verifies that the
+ * individual buffers request is plausible.
+ */
+static int iio_scan_mask_set(struct iio_dev *indio_dev,
+ struct iio_buffer *buffer, int bit)
+{
+ const unsigned long *mask;
+ unsigned long *trialmask;
+
+ trialmask = kmalloc(sizeof(*trialmask)*
+ BITS_TO_LONGS(indio_dev->masklength),
+ GFP_KERNEL);
+
+ if (trialmask == NULL)
+ return -ENOMEM;
+ if (!indio_dev->masklength) {
+ WARN_ON("Trying to set scanmask prior to registering buffer\n");
+ goto err_invalid_mask;
+ }
+ bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength);
+ set_bit(bit, trialmask);
+
+ if (!iio_validate_scan_mask(indio_dev, trialmask))
+ goto err_invalid_mask;
+
+ if (indio_dev->available_scan_masks) {
+ mask = iio_scan_mask_match(indio_dev->available_scan_masks,
+ indio_dev->masklength,
+ trialmask);
+ if (!mask)
+ goto err_invalid_mask;
+ }
+ bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength);
+
+ kfree(trialmask);
+
+ return 0;
+
+err_invalid_mask:
+ kfree(trialmask);
+ return -EINVAL;
+}
+
static int iio_scan_mask_clear(struct iio_buffer *buffer, int bit)
{
clear_bit(bit, buffer->scan_mask);
return ret;
}
-static const char * const iio_scan_elements_group_name = "scan_elements";
-
-int iio_buffer_register(struct iio_dev *indio_dev,
- const struct iio_chan_spec *channels,
- int num_channels)
-{
- struct iio_dev_attr *p;
- struct attribute **attr;
- struct iio_buffer *buffer = indio_dev->buffer;
- int ret, i, attrn, attrcount, attrcount_orig = 0;
-
- if (buffer->attrs)
- indio_dev->groups[indio_dev->groupcounter++] = buffer->attrs;
-
- if (buffer->scan_el_attrs != NULL) {
- attr = buffer->scan_el_attrs->attrs;
- while (*attr++ != NULL)
- attrcount_orig++;
- }
- attrcount = attrcount_orig;
- INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list);
- if (channels) {
- /* new magic */
- for (i = 0; i < num_channels; i++) {
- if (channels[i].scan_index < 0)
- continue;
-
- /* Establish necessary mask length */
- if (channels[i].scan_index >
- (int)indio_dev->masklength - 1)
- indio_dev->masklength
- = channels[i].scan_index + 1;
-
- ret = iio_buffer_add_channel_sysfs(indio_dev,
- &channels[i]);
- if (ret < 0)
- goto error_cleanup_dynamic;
- attrcount += ret;
- if (channels[i].type == IIO_TIMESTAMP)
- indio_dev->scan_index_timestamp =
- channels[i].scan_index;
- }
- if (indio_dev->masklength && buffer->scan_mask == NULL) {
- buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength),
- sizeof(*buffer->scan_mask),
- GFP_KERNEL);
- if (buffer->scan_mask == NULL) {
- ret = -ENOMEM;
- goto error_cleanup_dynamic;
- }
- }
- }
-
- buffer->scan_el_group.name = iio_scan_elements_group_name;
-
- buffer->scan_el_group.attrs = kcalloc(attrcount + 1,
- sizeof(buffer->scan_el_group.attrs[0]),
- GFP_KERNEL);
- if (buffer->scan_el_group.attrs == NULL) {
- ret = -ENOMEM;
- goto error_free_scan_mask;
- }
- if (buffer->scan_el_attrs)
- memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs,
- sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig);
- attrn = attrcount_orig;
-
- list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l)
- buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr;
- indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group;
-
- return 0;
-
-error_free_scan_mask:
- kfree(buffer->scan_mask);
-error_cleanup_dynamic:
- iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list);
-
- return ret;
-}
-EXPORT_SYMBOL(iio_buffer_register);
-
-void iio_buffer_unregister(struct iio_dev *indio_dev)
-{
- kfree(indio_dev->buffer->scan_mask);
- kfree(indio_dev->buffer->scan_el_group.attrs);
- iio_free_chan_devattr_list(&indio_dev->buffer->scan_el_dev_attr_list);
-}
-EXPORT_SYMBOL(iio_buffer_unregister);
-
-ssize_t iio_buffer_read_length(struct device *dev,
- struct device_attribute *attr,
- char *buf)
+static ssize_t iio_buffer_read_length(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct iio_buffer *buffer = indio_dev->buffer;
- if (buffer->access->get_length)
- return sprintf(buf, "%d\n",
- buffer->access->get_length(buffer));
-
- return 0;
+ return sprintf(buf, "%d\n", buffer->length);
}
-EXPORT_SYMBOL(iio_buffer_read_length);
-ssize_t iio_buffer_write_length(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
+static ssize_t iio_buffer_write_length(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct iio_buffer *buffer = indio_dev->buffer;
if (ret)
return ret;
- if (buffer->access->get_length)
- if (val == buffer->access->get_length(buffer))
- return len;
+ if (val == buffer->length)
+ return len;
mutex_lock(&indio_dev->mlock);
if (iio_buffer_is_active(indio_dev->buffer)) {
ret = -EBUSY;
} else {
- if (buffer->access->set_length)
- buffer->access->set_length(buffer, val);
+ buffer->access->set_length(buffer, val);
ret = 0;
}
mutex_unlock(&indio_dev->mlock);
return ret ? ret : len;
}
-EXPORT_SYMBOL(iio_buffer_write_length);
-ssize_t iio_buffer_show_enable(struct device *dev,
- struct device_attribute *attr,
- char *buf)
+static ssize_t iio_buffer_show_enable(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
return sprintf(buf, "%d\n", iio_buffer_is_active(indio_dev->buffer));
}
-EXPORT_SYMBOL(iio_buffer_show_enable);
-
-/* Note NULL used as error indicator as it doesn't make sense. */
-static const unsigned long *iio_scan_mask_match(const unsigned long *av_masks,
- unsigned int masklength,
- const unsigned long *mask)
-{
- if (bitmap_empty(mask, masklength))
- return NULL;
- while (*av_masks) {
- if (bitmap_subset(mask, av_masks, masklength))
- return av_masks;
- av_masks += BITS_TO_LONGS(masklength);
- }
- return NULL;
-}
static int iio_compute_scan_bytes(struct iio_dev *indio_dev,
const unsigned long *mask, bool timestamp)
indio_dev->currentmode = INDIO_BUFFER_TRIGGERED;
} else if (indio_dev->modes & INDIO_BUFFER_HARDWARE) {
indio_dev->currentmode = INDIO_BUFFER_HARDWARE;
+ } else if (indio_dev->modes & INDIO_BUFFER_SOFTWARE) {
+ indio_dev->currentmode = INDIO_BUFFER_SOFTWARE;
} else { /* Should never be reached */
ret = -EINVAL;
goto error_run_postdisable;
}
EXPORT_SYMBOL_GPL(iio_update_buffers);
-ssize_t iio_buffer_store_enable(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
+static ssize_t iio_buffer_store_enable(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
{
int ret;
bool requested_state;
mutex_unlock(&indio_dev->mlock);
return (ret < 0) ? ret : len;
}
-EXPORT_SYMBOL(iio_buffer_store_enable);
-/**
- * iio_validate_scan_mask_onehot() - Validates that exactly one channel is selected
- * @indio_dev: the iio device
- * @mask: scan mask to be checked
- *
- * Return true if exactly one bit is set in the scan mask, false otherwise. It
- * can be used for devices where only one channel can be active for sampling at
- * a time.
- */
-bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev,
- const unsigned long *mask)
-{
- return bitmap_weight(mask, indio_dev->masklength) == 1;
-}
-EXPORT_SYMBOL_GPL(iio_validate_scan_mask_onehot);
-
-static bool iio_validate_scan_mask(struct iio_dev *indio_dev,
- const unsigned long *mask)
-{
- if (!indio_dev->setup_ops->validate_scan_mask)
- return true;
+static const char * const iio_scan_elements_group_name = "scan_elements";
- return indio_dev->setup_ops->validate_scan_mask(indio_dev, mask);
-}
+static DEVICE_ATTR(length, S_IRUGO | S_IWUSR, iio_buffer_read_length,
+ iio_buffer_write_length);
+static struct device_attribute dev_attr_length_ro = __ATTR(length,
+ S_IRUGO, iio_buffer_read_length, NULL);
+static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR,
+ iio_buffer_show_enable, iio_buffer_store_enable);
-/**
- * iio_scan_mask_set() - set particular bit in the scan mask
- * @indio_dev: the iio device
- * @buffer: the buffer whose scan mask we are interested in
- * @bit: the bit to be set.
- *
- * Note that at this point we have no way of knowing what other
- * buffers might request, hence this code only verifies that the
- * individual buffers request is plausible.
- */
-int iio_scan_mask_set(struct iio_dev *indio_dev,
- struct iio_buffer *buffer, int bit)
+int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
{
- const unsigned long *mask;
- unsigned long *trialmask;
+ struct iio_dev_attr *p;
+ struct attribute **attr;
+ struct iio_buffer *buffer = indio_dev->buffer;
+ int ret, i, attrn, attrcount, attrcount_orig = 0;
+ const struct iio_chan_spec *channels;
- trialmask = kmalloc(sizeof(*trialmask)*
- BITS_TO_LONGS(indio_dev->masklength),
- GFP_KERNEL);
+ if (!buffer)
+ return 0;
- if (trialmask == NULL)
+ attrcount = 0;
+ if (buffer->attrs) {
+ while (buffer->attrs[attrcount] != NULL)
+ attrcount++;
+ }
+
+ buffer->buffer_group.name = "buffer";
+ buffer->buffer_group.attrs = kcalloc(attrcount + 3,
+ sizeof(*buffer->buffer_group.attrs), GFP_KERNEL);
+ if (!buffer->buffer_group.attrs)
return -ENOMEM;
- if (!indio_dev->masklength) {
- WARN_ON("Trying to set scanmask prior to registering buffer\n");
- goto err_invalid_mask;
+
+ if (buffer->access->set_length)
+ buffer->buffer_group.attrs[0] = &dev_attr_length.attr;
+ else
+ buffer->buffer_group.attrs[0] = &dev_attr_length_ro.attr;
+ buffer->buffer_group.attrs[1] = &dev_attr_enable.attr;
+ if (buffer->attrs)
+ memcpy(&buffer->buffer_group.attrs[2], buffer->attrs,
+ sizeof(*&buffer->buffer_group.attrs) * attrcount);
+ buffer->buffer_group.attrs[attrcount+2] = NULL;
+
+ indio_dev->groups[indio_dev->groupcounter++] = &buffer->buffer_group;
+
+ if (buffer->scan_el_attrs != NULL) {
+ attr = buffer->scan_el_attrs->attrs;
+ while (*attr++ != NULL)
+ attrcount_orig++;
}
- bitmap_copy(trialmask, buffer->scan_mask, indio_dev->masklength);
- set_bit(bit, trialmask);
+ attrcount = attrcount_orig;
+ INIT_LIST_HEAD(&buffer->scan_el_dev_attr_list);
+ channels = indio_dev->channels;
+ if (channels) {
+ /* new magic */
+ for (i = 0; i < indio_dev->num_channels; i++) {
+ if (channels[i].scan_index < 0)
+ continue;
- if (!iio_validate_scan_mask(indio_dev, trialmask))
- goto err_invalid_mask;
+ /* Establish necessary mask length */
+ if (channels[i].scan_index >
+ (int)indio_dev->masklength - 1)
+ indio_dev->masklength
+ = channels[i].scan_index + 1;
- if (indio_dev->available_scan_masks) {
- mask = iio_scan_mask_match(indio_dev->available_scan_masks,
- indio_dev->masklength,
- trialmask);
- if (!mask)
- goto err_invalid_mask;
+ ret = iio_buffer_add_channel_sysfs(indio_dev,
+ &channels[i]);
+ if (ret < 0)
+ goto error_cleanup_dynamic;
+ attrcount += ret;
+ if (channels[i].type == IIO_TIMESTAMP)
+ indio_dev->scan_index_timestamp =
+ channels[i].scan_index;
+ }
+ if (indio_dev->masklength && buffer->scan_mask == NULL) {
+ buffer->scan_mask = kcalloc(BITS_TO_LONGS(indio_dev->masklength),
+ sizeof(*buffer->scan_mask),
+ GFP_KERNEL);
+ if (buffer->scan_mask == NULL) {
+ ret = -ENOMEM;
+ goto error_cleanup_dynamic;
+ }
+ }
}
- bitmap_copy(buffer->scan_mask, trialmask, indio_dev->masklength);
- kfree(trialmask);
+ buffer->scan_el_group.name = iio_scan_elements_group_name;
+
+ buffer->scan_el_group.attrs = kcalloc(attrcount + 1,
+ sizeof(buffer->scan_el_group.attrs[0]),
+ GFP_KERNEL);
+ if (buffer->scan_el_group.attrs == NULL) {
+ ret = -ENOMEM;
+ goto error_free_scan_mask;
+ }
+ if (buffer->scan_el_attrs)
+ memcpy(buffer->scan_el_group.attrs, buffer->scan_el_attrs,
+ sizeof(buffer->scan_el_group.attrs[0])*attrcount_orig);
+ attrn = attrcount_orig;
+
+ list_for_each_entry(p, &buffer->scan_el_dev_attr_list, l)
+ buffer->scan_el_group.attrs[attrn++] = &p->dev_attr.attr;
+ indio_dev->groups[indio_dev->groupcounter++] = &buffer->scan_el_group;
return 0;
-err_invalid_mask:
- kfree(trialmask);
- return -EINVAL;
+error_free_scan_mask:
+ kfree(buffer->scan_mask);
+error_cleanup_dynamic:
+ iio_free_chan_devattr_list(&buffer->scan_el_dev_attr_list);
+ kfree(indio_dev->buffer->buffer_group.attrs);
+
+ return ret;
+}
+
+void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev)
+{
+ if (!indio_dev->buffer)
+ return;
+
+ kfree(indio_dev->buffer->scan_mask);
+ kfree(indio_dev->buffer->buffer_group.attrs);
+ kfree(indio_dev->buffer->scan_el_group.attrs);
+ iio_free_chan_devattr_list(&indio_dev->buffer->scan_el_dev_attr_list);
+}
+
+/**
+ * iio_validate_scan_mask_onehot() - Validates that exactly one channel is selected
+ * @indio_dev: the iio device
+ * @mask: scan mask to be checked
+ *
+ * Return true if exactly one bit is set in the scan mask, false otherwise. It
+ * can be used for devices where only one channel can be active for sampling at
+ * a time.
+ */
+bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev,
+ const unsigned long *mask)
+{
+ return bitmap_weight(mask, indio_dev->masklength) == 1;
}
-EXPORT_SYMBOL_GPL(iio_scan_mask_set);
+EXPORT_SYMBOL_GPL(iio_validate_scan_mask_onehot);
int iio_scan_mask_query(struct iio_dev *indio_dev,
struct iio_buffer *buffer, int bit)
projects / linux-2.6-block.git / blobdiff