size_t n, loff_t *f_ps)
{
struct iio_ring_buffer *rb = filp->private_data;
- int ret;
- /* rip lots must exist. */
if (!rb->access->read_first_n)
return -EINVAL;
- ret = rb->access->read_first_n(rb, n, buf);
-
- return ret;
+ return rb->access->read_first_n(rb, n, buf);
}
/**
struct poll_table_struct *wait)
{
struct iio_ring_buffer *rb = filp->private_data;
- int ret = 0;
poll_wait(filp, &rb->pollq, wait);
if (rb->stufftoread)
return POLLIN | POLLRDNORM;
/* need a way of knowing if there may be enough data... */
- return ret;
+ return 0;
}
static const struct file_operations iio_ring_fileops = {
static inline int
__iio_request_ring_buffer_chrdev(struct iio_ring_buffer *buf,
- struct module *owner)
+ struct module *owner,
+ int id)
{
- int ret, minor;
+ int ret;
buf->access_handler.flags = 0;
-
buf->dev.bus = &iio_bus_type;
device_initialize(&buf->dev);
- minor = iio_device_get_chrdev_minor();
- if (minor < 0) {
- ret = minor;
+ ret = iio_device_get_chrdev_minor();
+ if (ret < 0)
goto error_device_put;
- }
- buf->dev.devt = MKDEV(MAJOR(iio_devt), minor);
+
+ buf->dev.devt = MKDEV(MAJOR(iio_devt), ret);
dev_set_name(&buf->dev, "%s:buffer%d",
dev_name(buf->dev.parent),
- buf->id);
+ id);
ret = device_add(&buf->dev);
if (ret < 0) {
printk(KERN_ERR "failed to add the ring dev\n");
EXPORT_SYMBOL(iio_ring_buffer_init);
static ssize_t iio_show_scan_index(struct device *dev,
- struct device_attribute *attr,
- char *buf)
+ struct device_attribute *attr,
+ char *buf)
{
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- return sprintf(buf, "%u\n", this_attr->c->scan_index);
+ return sprintf(buf, "%u\n", to_iio_dev_attr(attr)->c->scan_index);
}
static ssize_t iio_show_fixed_type(struct device *dev,
this_attr->c->scan_type.shift);
}
+static ssize_t iio_scan_el_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ struct iio_ring_buffer *ring = dev_get_drvdata(dev);
+
+ ret = iio_scan_mask_query(ring, to_iio_dev_attr(attr)->address);
+ if (ret < 0)
+ return ret;
+ return sprintf(buf, "%d\n", ret);
+}
+
+static int iio_scan_mask_clear(struct iio_ring_buffer *ring, int bit)
+{
+ if (bit > IIO_MAX_SCAN_LENGTH)
+ return -EINVAL;
+ ring->scan_mask &= ~(1 << bit);
+ ring->scan_count--;
+ return 0;
+}
+
+static ssize_t iio_scan_el_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ int ret = 0;
+ bool state;
+ struct iio_ring_buffer *ring = dev_get_drvdata(dev);
+ struct iio_dev *indio_dev = ring->indio_dev;
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+
+ state = !(buf[0] == '0');
+ mutex_lock(&indio_dev->mlock);
+ if (indio_dev->currentmode == INDIO_RING_TRIGGERED) {
+ ret = -EBUSY;
+ goto error_ret;
+ }
+ ret = iio_scan_mask_query(ring, this_attr->address);
+ if (ret < 0)
+ goto error_ret;
+ if (!state && ret) {
+ ret = iio_scan_mask_clear(ring, this_attr->address);
+ if (ret)
+ goto error_ret;
+ } else if (state && !ret) {
+ ret = iio_scan_mask_set(ring, this_attr->address);
+ if (ret)
+ goto error_ret;
+ }
+
+error_ret:
+ mutex_unlock(&indio_dev->mlock);
+
+ return ret ? ret : len;
+
+}
+
+static ssize_t iio_scan_el_ts_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_ring_buffer *ring = dev_get_drvdata(dev);
+ return sprintf(buf, "%d\n", ring->scan_timestamp);
+}
+
+static ssize_t iio_scan_el_ts_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ int ret = 0;
+ struct iio_ring_buffer *ring = dev_get_drvdata(dev);
+ struct iio_dev *indio_dev = ring->indio_dev;
+ bool state;
+ state = !(buf[0] == '0');
+ mutex_lock(&indio_dev->mlock);
+ if (indio_dev->currentmode == INDIO_RING_TRIGGERED) {
+ ret = -EBUSY;
+ goto error_ret;
+ }
+ ring->scan_timestamp = state;
+error_ret:
+ mutex_unlock(&indio_dev->mlock);
+
+ return ret ? ret : len;
+}
+
static int iio_ring_add_channel_sysfs(struct iio_ring_buffer *ring,
const struct iio_chan_spec *chan)
{
0,
&ring->dev,
&ring->scan_el_dev_attr_list);
-
if (ret)
goto error_ret;
{
int ret, i;
- ring->id = id;
-
- ret = __iio_request_ring_buffer_chrdev(ring, ring->owner);
-
+ ret = __iio_request_ring_buffer_chrdev(ring, ring->owner, id);
if (ret)
goto error_ret;
+
if (ring->scan_el_attrs) {
ret = sysfs_create_group(&ring->dev.kobj,
ring->scan_el_attrs);
}
EXPORT_SYMBOL(iio_ring_buffer_register_ex);
-int iio_ring_buffer_register(struct iio_ring_buffer *ring, int id)
-{
- return iio_ring_buffer_register_ex(ring, id, NULL, 0);
-}
-EXPORT_SYMBOL(iio_ring_buffer_register);
-
void iio_ring_buffer_unregister(struct iio_ring_buffer *ring)
{
__iio_ring_attr_cleanup(ring);
struct device_attribute *attr,
char *buf)
{
- int len = 0;
struct iio_ring_buffer *ring = dev_get_drvdata(dev);
if (ring->access->get_length)
- len = sprintf(buf, "%d\n",
- ring->access->get_length(ring));
+ return sprintf(buf, "%d\n",
+ ring->access->get_length(ring));
- return len;
+ return 0;
}
EXPORT_SYMBOL(iio_read_ring_length);
int ret;
ulong val;
struct iio_ring_buffer *ring = dev_get_drvdata(dev);
+
ret = strict_strtoul(buf, 10, &val);
if (ret)
return ret;
struct device_attribute *attr,
char *buf)
{
- int len = 0;
struct iio_ring_buffer *ring = dev_get_drvdata(dev);
if (ring->access->get_bytes_per_datum)
- len = sprintf(buf, "%d\n",
- ring->access->get_bytes_per_datum(ring));
+ return sprintf(buf, "%d\n",
+ ring->access->get_bytes_per_datum(ring));
- return len;
+ return 0;
}
EXPORT_SYMBOL(iio_read_ring_bytes_per_datum);
}
if (ring->setup_ops->postenable) {
-
ret = ring->setup_ops->postenable(dev_info);
if (ret) {
printk(KERN_INFO
return ret;
}
EXPORT_SYMBOL(iio_store_ring_enable);
+
ssize_t iio_show_ring_enable(struct device *dev,
struct device_attribute *attr,
char *buf)
}
EXPORT_SYMBOL(iio_show_ring_enable);
-ssize_t iio_scan_el_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- int ret;
- struct iio_ring_buffer *ring = dev_get_drvdata(dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-
- ret = iio_scan_mask_query(ring, this_attr->address);
- if (ret < 0)
- return ret;
- return sprintf(buf, "%d\n", ret);
-}
-EXPORT_SYMBOL(iio_scan_el_show);
-
-ssize_t iio_scan_el_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- int ret = 0;
- bool state;
- struct iio_ring_buffer *ring = dev_get_drvdata(dev);
- struct iio_dev *indio_dev = ring->indio_dev;
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-
- state = !(buf[0] == '0');
- mutex_lock(&indio_dev->mlock);
- if (indio_dev->currentmode == INDIO_RING_TRIGGERED) {
- ret = -EBUSY;
- goto error_ret;
- }
- ret = iio_scan_mask_query(ring, this_attr->address);
- if (ret < 0)
- goto error_ret;
- if (!state && ret) {
- ret = iio_scan_mask_clear(ring, this_attr->address);
- if (ret)
- goto error_ret;
- } else if (state && !ret) {
- ret = iio_scan_mask_set(ring, this_attr->address);
- if (ret)
- goto error_ret;
- }
-
-error_ret:
- mutex_unlock(&indio_dev->mlock);
-
- return ret ? ret : len;
-
-}
-EXPORT_SYMBOL(iio_scan_el_store);
-
-ssize_t iio_scan_el_ts_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_ring_buffer *ring = dev_get_drvdata(dev);
- return sprintf(buf, "%d\n", ring->scan_timestamp);
-}
-EXPORT_SYMBOL(iio_scan_el_ts_show);
-
-ssize_t iio_scan_el_ts_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- int ret = 0;
- struct iio_ring_buffer *ring = dev_get_drvdata(dev);
- struct iio_dev *indio_dev = ring->indio_dev;
- bool state;
- state = !(buf[0] == '0');
- mutex_lock(&indio_dev->mlock);
- if (indio_dev->currentmode == INDIO_RING_TRIGGERED) {
- ret = -EBUSY;
- goto error_ret;
- }
- ring->scan_timestamp = state;
-error_ret:
- mutex_unlock(&indio_dev->mlock);
-
- return ret ? ret : len;
-}
-EXPORT_SYMBOL(iio_scan_el_ts_store);
-
int iio_sw_ring_preenable(struct iio_dev *indio_dev)
{
struct iio_ring_buffer *ring = indio_dev->ring;
* @dev: ring buffer device struct
* @indio_dev: industrial I/O device structure
* @owner: module that owns the ring buffer (for ref counting)
- * @id: unique id number
* @length: [DEVICE] number of datums in ring
* @bytes_per_datum: [DEVICE] size of individual datum including timestamp
* @bpe: [DEVICE] size of individual channel value
- * @loopcount: [INTERN] number of times the ring has looped
* @scan_el_attrs: [DRIVER] control of scan elements if that scan mode
* control method is used
* @scan_count: [INTERN] the number of elements in the current scan mode
* @postenable: [DRIVER] function to run after marking ring enabled
* @predisable: [DRIVER] function to run prior to marking ring disabled
* @postdisable: [DRIVER] function to run after marking ring disabled
- **/
+ **/
struct iio_ring_buffer {
- struct device dev;
- struct iio_dev *indio_dev;
- struct module *owner;
- int id;
- int length;
- int bytes_per_datum;
- int bpe;
- int loopcount;
- struct attribute_group *scan_el_attrs;
- int scan_count;
- u32 scan_mask;
- bool scan_timestamp;
- struct iio_handler access_handler;
+ struct device dev;
+ struct iio_dev *indio_dev;
+ struct module *owner;
+ int length;
+ int bytes_per_datum;
+ int bpe;
+ struct attribute_group *scan_el_attrs;
+ int scan_count;
+ unsigned long scan_mask;
+ bool scan_timestamp;
+ struct iio_handler access_handler;
const struct iio_ring_access_funcs *access;
- const struct iio_ring_setup_ops *setup_ops;
- struct list_head scan_el_dev_attr_list;
+ const struct iio_ring_setup_ops *setup_ops;
+ struct list_head scan_el_dev_attr_list;
- wait_queue_head_t pollq;
- bool stufftoread;
+ wait_queue_head_t pollq;
+ bool stufftoread;
};
/**
{
ring->bytes_per_datum = bytes_per_datum;
ring->length = length;
- ring->loopcount = 0;
}
-/**
- * iio_scan_el_store() - sysfs scan element selection interface
- * @dev: the target device
- * @attr: the device attribute that is being processed
- * @buf: input from userspace
- * @len: length of input
- *
- * A generic function used to enable various scan elements. In some
- * devices explicit read commands for each channel mean this is merely
- * a software switch. In others this must actively disable the channel.
- * Complexities occur when this interacts with data ready type triggers
- * which may not reset unless every channel that is enabled is explicitly
- * read.
- **/
-ssize_t iio_scan_el_store(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t len);
-/**
- * iio_scan_el_show() - sysfs interface to query whether a scan element
- * is enabled or not
- * @dev: the target device
- * @attr: the device attribute that is being processed
- * @buf: output buffer
- **/
-ssize_t iio_scan_el_show(struct device *dev, struct device_attribute *attr,
- char *buf);
-
-/**
- * iio_scan_el_ts_store() - sysfs interface to set whether a timestamp is included
- * in the scan.
- **/
-ssize_t iio_scan_el_ts_store(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t len);
-/**
- * iio_scan_el_ts_show() - sysfs interface to query if a timestamp is included
- * in the scan.
- **/
-ssize_t iio_scan_el_ts_show(struct device *dev, struct device_attribute *attr,
- char *buf);
-
/*
* These are mainly provided to allow for a change of implementation if a device
* has a large number of scan elements
return 0;
};
-/**
- * iio_scan_mask_clear() - clear a particular element from the scan mask
- * @ring: the ring buffer whose scan mask we are interested in
- * @bit: the bit to clear
- **/
-static inline int iio_scan_mask_clear(struct iio_ring_buffer *ring, int bit)
-{
- if (bit > IIO_MAX_SCAN_LENGTH)
- return -EINVAL;
- ring->scan_mask &= ~(1 << bit);
- ring->scan_count--;
- return 0;
-};
-
-/**
- * iio_scan_mask_count_to_right() - how many scan elements occur before here
- * @ring: the ring buffer whose scan mask we interested in
- * @bit: which number scan element is this
- **/
-static inline int iio_scan_mask_count_to_right(struct iio_ring_buffer *ring,
- int bit)
-{
- int count = 0;
- int mask = (1 << bit);
- if (bit > IIO_MAX_SCAN_LENGTH)
- return -EINVAL;
- while (mask) {
- mask >>= 1;
- if (mask & ring->scan_mask)
- count++;
- }
-
- return count;
-}
-
/**
* iio_put_ring_buffer() - notify done with buffer
* @ring: the buffer we are done with.
put_device(&ring->dev);
};
-#define to_iio_ring_buffer(d) \
+#define to_iio_ring_buffer(d) \
container_of(d, struct iio_ring_buffer, dev)
/**
- * iio_ring_buffer_register() - register the buffer with IIO core
- * @ring: the buffer to be registered
- * @id: the id of the buffer (typically 0)
- **/
-int iio_ring_buffer_register(struct iio_ring_buffer *ring, int id);
-
-/** iio_ring_buffer_register_ex() - register the buffer with IIO core
+ * iio_ring_buffer_register_ex() - register the buffer with IIO core
* @ring: the buffer to be registered
* @id: the id of the buffer (typically 0)
**/
int iio_sw_ring_preenable(struct iio_dev *indio_dev);
#else /* CONFIG_IIO_RING_BUFFER */
-static inline int iio_ring_buffer_register(struct iio_ring_buffer *ring, int id)
-{
- return 0;
-};
static inline int iio_ring_buffer_register_ex(struct iio_ring_buffer *ring,
int id,
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