#ifdef CONFIG_IIO_RING_BUFFER
-struct iio_handler;
struct iio_ring_buffer;
-struct iio_dev;
/**
* iio_push_ring_event() - ring buffer specific push to event chrdev
* change.
* @request_update: if a parameter change has been marked, update underlying
* storage.
- * @get_bpd: get current bytes per datum
- * @set_bpd: set number of bytes per datum
+ * @get_bytes_per_datum:get current bytes per datum
+ * @set_bytes_per_datum:set number of bytes per datum
* @get_length: get number of datums in ring
* @set_length: set number of datums in ring
* @is_enabled: query if ring is currently being used
int (*mark_param_change)(struct iio_ring_buffer *ring);
int (*request_update)(struct iio_ring_buffer *ring);
- int (*get_bpd)(struct iio_ring_buffer *ring);
- int (*set_bpd)(struct iio_ring_buffer *ring, size_t bpd);
+ int (*get_bytes_per_datum)(struct iio_ring_buffer *ring);
+ int (*set_bytes_per_datum)(struct iio_ring_buffer *ring, size_t bpd);
int (*get_length)(struct iio_ring_buffer *ring);
int (*set_length)(struct iio_ring_buffer *ring, int length);
* @id: unique id number
* @access_id: device id number
* @length: [DEVICE] number of datums in ring
- * @bpd: [DEVICE] size of individual datum including timestamp
+ * @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
+ * @scan_mask: [INTERN] bitmask used in masking scan mode elements
+ * @scan_timestamp: [INTERN] does the scan mode include a timestamp
* @access_handler: [INTERN] chrdev access handling
* @ev_int: [INTERN] chrdev interface for the event chrdev
* @shared_ev_pointer: [INTERN] the shared event pointer to allow escalation of
int id;
int access_id;
int length;
- int bpd;
+ 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 iio_event_interface ev_int;
struct iio_shared_ev_pointer shared_ev_pointer;
int (*postdisable)(struct iio_dev *);
};
+
+/**
+ * iio_ring_buffer_init() - Initialize the buffer structure
+ * @ring: buffer to be initialized
+ * @dev_info: the iio device the buffer is assocated with
+ **/
void iio_ring_buffer_init(struct iio_ring_buffer *ring,
struct iio_dev *dev_info);
static inline void __iio_update_ring_buffer(struct iio_ring_buffer *ring,
int bytes_per_datum, int length)
{
- ring->bpd = bytes_per_datum;
+ ring->bytes_per_datum = bytes_per_datum;
ring->length = length;
ring->loopcount = 0;
}
* struct iio_scan_el - an individual element of a scan
* @dev_attr: control attribute (if directly controllable)
* @number: unique identifier of element (used for bit mask)
- * @bit_count: number of bits in scan element
* @label: useful data for the scan el (often reg address)
* @set_state: for some devices datardy signals are generated
* for any enabled lines. This allows unwanted lines
struct iio_scan_el {
struct device_attribute dev_attr;
unsigned int number;
- int bit_count;
unsigned int label;
int (*set_state)(struct iio_scan_el *scanel,
ssize_t iio_scan_el_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t len);
/**
- * iio_scal_el_show() - sysfs interface to query whether a scan element is
+ * 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
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);
/**
* @_name: identifying name. Resulting struct is iio_scan_el_##_name,
* sysfs element, _name##_en.
* @_number: unique id number for the scan element.
- * @_bits: number of bits in the scan element result (used in mixed bit
* length devices).
* @_label: indentification variable used by drivers. Often a reg address.
* @_controlfunc: function used to notify hardware of whether state changes
**/
-#define __IIO_SCAN_EL_C(_name, _number, _bits, _label, _controlfunc) \
+#define __IIO_SCAN_EL_C(_name, _number, _label, _controlfunc) \
struct iio_scan_el iio_scan_el_##_name = { \
- .dev_attr = __ATTR(_number##_##_name##_en, \
+ .dev_attr = __ATTR(_name##_en, \
S_IRUGO | S_IWUSR, \
iio_scan_el_show, \
iio_scan_el_store), \
.number = _number, \
- .bit_count = _bits, \
.label = _label, \
.set_state = _controlfunc, \
- }
+ }; \
+ static IIO_CONST_ATTR(_name##_index, #_number)
-#define IIO_SCAN_EL_C(_name, _number, _bits, _label, _controlfunc) \
- __IIO_SCAN_EL_C(_name, _number, _bits, _label, _controlfunc)
+#define IIO_SCAN_EL_C(_name, _number, _label, _controlfunc) \
+ __IIO_SCAN_EL_C(_name, _number, _label, _controlfunc)
-#define __IIO_SCAN_NAMED_EL_C(_name, _string, _number, _bits, _label, _cf) \
+#define __IIO_SCAN_NAMED_EL_C(_name, _string, _number, _label, _cf) \
struct iio_scan_el iio_scan_el_##_name = { \
- .dev_attr = __ATTR(_number##_##_string##_en, \
+ .dev_attr = __ATTR(_string##_en, \
S_IRUGO | S_IWUSR, \
iio_scan_el_show, \
iio_scan_el_store), \
.number = _number, \
- .bit_count = _bits, \
.label = _label, \
.set_state = _cf, \
+ }; \
+ static struct iio_const_attr iio_const_attr_##_name##_index = { \
+ .string = #_number, \
+ .dev_attr = __ATTR(_string##_index, \
+ S_IRUGO, iio_read_const_attr, NULL) \
}
-#define IIO_SCAN_NAMED_EL_C(_name, _string, _number, _bits, _label, _cf) \
- __IIO_SCAN_NAMED_EL_C(_name, _string, _number, _bits, _label, _cf)
+
+
+#define IIO_SCAN_NAMED_EL_C(_name, _string, _number, _label, _cf) \
+ __IIO_SCAN_NAMED_EL_C(_name, _string, _number, _label, _cf)
/**
* IIO_SCAN_EL_TIMESTAMP - declare a special scan element for timestamps
+ * @number: specify where in the scan order this is stored.
*
* Odd one out. Handled slightly differently from other scan elements.
**/
#define IIO_SCAN_EL_TIMESTAMP(number) \
struct iio_scan_el iio_scan_el_timestamp = { \
- .dev_attr = __ATTR(number##_timestamp_en, \
+ .dev_attr = __ATTR(timestamp_en, \
S_IRUGO | S_IWUSR, \
iio_scan_el_ts_show, \
iio_scan_el_ts_store), \
+ }; \
+ static IIO_CONST_ATTR(timestamp_index, #number)
+
+/**
+ * IIO_CONST_ATTR_SCAN_EL_TYPE - attr to specify the data format of a scan el
+ * @name: the scan el name (may be more general and cover a set of scan elements
+ * @_sign: either s or u for signed or unsigned
+ * @_bits: number of actual bits occuplied by the value
+ * @_storagebits: number of bits _bits is padded to when read out of buffer
+ **/
+#define IIO_CONST_ATTR_SCAN_EL_TYPE(_name, _sign, _bits, _storagebits) \
+ IIO_CONST_ATTR(_name##_type, #_sign#_bits"/"#_storagebits);
+
+/**
+ * IIO_CONST_ATTR_SCAN_EL_TYPE_WITH_SHIFT - attr to specify the data format of a scan el
+ * @name: the scan el name (may be more general and cover a set of scan elements
+ * @_sign: either s or u for signed or unsigned
+ * @_bits: number of actual bits occuplied by the value
+ * @_storagebits: number of bits _bits is padded to when read out of buffer
+ * @_shiftbits: number of bits _shiftbits the result must be shifted
+ **/
+#define IIO_CONST_ATTR_SCAN_EL_TYPE_WITH_SHIFT(_name, _sign, _bits, \
+ _storagebits, _shiftbits) \
+ IIO_CONST_ATTR(_name##_type, #_sign#_bits"/"#_storagebits \
+ ">>"#_shiftbits);
+
+#define IIO_SCAN_EL_TYPE_SIGNED 's'
+#define IIO_SCAN_EL_TYPE_UNSIGNED 'u'
+
+/*
+ * These are mainly provided to allow for a change of implementation if a device
+ * has a large number of scan elements
+ */
+#define IIO_MAX_SCAN_LENGTH 31
+
+/* note 0 used as error indicator as it doesn't make sense. */
+static inline u32 iio_scan_mask_match(u32 *av_masks, u32 mask)
+{
+ while (*av_masks) {
+ if (!(~*av_masks & mask))
+ return *av_masks;
+ av_masks++;
+ }
+ return 0;
+}
+
+static inline int iio_scan_mask_query(struct iio_ring_buffer *ring, int bit)
+{
+ struct iio_dev *dev_info = ring->indio_dev;
+ u32 mask;
+
+ if (bit > IIO_MAX_SCAN_LENGTH)
+ return -EINVAL;
+
+ if (!ring->scan_mask)
+ return 0;
+
+ if (dev_info->available_scan_masks)
+ mask = iio_scan_mask_match(dev_info->available_scan_masks,
+ ring->scan_mask);
+ else
+ mask = ring->scan_mask;
+
+ if (!mask)
+ return -EINVAL;
+
+ return !!(mask & (1 << bit));
+};
+
+/**
+ * iio_scan_mask_set() - set particular bit in the scan mask
+ * @ring: the ring buffer whose scan mask we are interested in
+ * @bit: the bit to be set.
+ **/
+static inline int iio_scan_mask_set(struct iio_ring_buffer *ring, int bit)
+{
+ struct iio_dev *dev_info = ring->indio_dev;
+ u32 mask;
+ u32 trialmask = ring->scan_mask | (1 << bit);
+
+ if (bit > IIO_MAX_SCAN_LENGTH)
+ return -EINVAL;
+ if (dev_info->available_scan_masks) {
+ mask = iio_scan_mask_match(dev_info->available_scan_masks,
+ trialmask);
+ if (!mask)
+ return -EINVAL;
+ }
+ ring->scan_mask = trialmask;
+ ring->scan_count++;
+
+ 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.
+ **/
static inline void iio_put_ring_buffer(struct iio_ring_buffer *ring)
{
put_device(&ring->dev);
container_of(d, struct iio_ring_buffer, dev)
#define access_dev_to_iio_ring_buffer(d) \
container_of(d, struct iio_ring_buffer, access_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_unregister() - unregister the buffer from IIO core
+ * @ring: the buffer to be unregistered
+ **/
void iio_ring_buffer_unregister(struct iio_ring_buffer *ring);
+/**
+ * iio_read_ring_length() - attr func to get number of datums in the buffer
+ **/
ssize_t iio_read_ring_length(struct device *dev,
struct device_attribute *attr,
char *buf);
+/**
+ * iio_write_ring_length() - attr func to set number of datums in the buffer
+ **/
ssize_t iio_write_ring_length(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len);
-ssize_t iio_read_ring_bps(struct device *dev,
+/**
+ * iio_read_ring_bytes_per_datum() - attr for number of bytes in whole datum
+ **/
+ssize_t iio_read_ring_bytes_per_datum(struct device *dev,
struct device_attribute *attr,
char *buf);
+/**
+ * iio_store_ring_enable() - attr to turn the buffer on
+ **/
ssize_t iio_store_ring_enable(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len);
+/**
+ * iio_show_ring_enable() - attr to see if the buffer is on
+ **/
ssize_t iio_show_ring_enable(struct device *dev,
struct device_attribute *attr,
char *buf);
#define IIO_RING_LENGTH_ATTR DEVICE_ATTR(length, S_IRUGO | S_IWUSR, \
iio_read_ring_length, \
iio_write_ring_length)
-#define IIO_RING_BPS_ATTR DEVICE_ATTR(bps, S_IRUGO | S_IWUSR, \
- iio_read_ring_bps, NULL)
-#define IIO_RING_ENABLE_ATTR DEVICE_ATTR(ring_enable, S_IRUGO | S_IWUSR, \
+#define IIO_RING_BYTES_PER_DATUM_ATTR DEVICE_ATTR(bytes_per_datum, S_IRUGO | S_IWUSR, \
+ iio_read_ring_bytes_per_datum, NULL)
+#define IIO_RING_ENABLE_ATTR DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, \
iio_show_ring_enable, \
iio_store_ring_enable)
#else /* CONFIG_IIO_RING_BUFFER */
git.openpandora.org / pandora-kernel.git / blobdiff