uintptr_t private;
};
+/**
+ * struct iio_enum - Enum channel info attribute
+ * @items: An array of strings.
+ * @num_items: Length of the item array.
+ * @set: Set callback function, may be NULL.
+ * @get: Get callback function, may be NULL.
+ *
+ * The iio_enum struct can be used to implement enum style channel attributes.
+ * Enum style attributes are those which have a set of strings which map to
+ * unsigned integer values. The IIO enum helper code takes care of mapping
+ * between value and string as well as generating a "_available" file which
+ * contains a list of all available items. The set callback will be called when
+ * the attribute is updated. The last parameter is the index to the newly
+ * activated item. The get callback will be used to query the currently active
+ * item and is supposed to return the index for it.
+ */
+struct iio_enum {
+ const char * const *items;
+ unsigned int num_items;
+ int (*set)(struct iio_dev *, const struct iio_chan_spec *, unsigned int);
+ int (*get)(struct iio_dev *, const struct iio_chan_spec *);
+};
+
+ssize_t iio_enum_available_read(struct iio_dev *indio_dev,
+ uintptr_t priv, const struct iio_chan_spec *chan, char *buf);
+ssize_t iio_enum_read(struct iio_dev *indio_dev,
+ uintptr_t priv, const struct iio_chan_spec *chan, char *buf);
+ssize_t iio_enum_write(struct iio_dev *indio_dev,
+ uintptr_t priv, const struct iio_chan_spec *chan, const char *buf,
+ size_t len);
+
+/**
+ * IIO_ENUM() - Initialize enum extended channel attribute
+ * @_name: Attribute name
+ * @_shared: Whether the attribute is shared between all channels
+ * @_e: Pointer to a iio_enum struct
+ *
+ * This should usually be used together with IIO_ENUM_AVAILABLE()
+ */
+#define IIO_ENUM(_name, _shared, _e) \
+{ \
+ .name = (_name), \
+ .shared = (_shared), \
+ .read = iio_enum_read, \
+ .write = iio_enum_write, \
+ .private = (uintptr_t)(_e), \
+}
+
+/**
+ * IIO_ENUM_AVAILABLE() - Initialize enum available extended channel attribute
+ * @_name: Attribute name ("_available" will be appended to the name)
+ * @_e: Pointer to a iio_enum struct
+ *
+ * Creates a read only attribute which list all the available enum items in a
+ * space separated list. This should usually be used together with IIO_ENUM()
+ */
+#define IIO_ENUM_AVAILABLE(_name, _e) \
+{ \
+ .name = (_name "_available"), \
+ .shared = true, \
+ .read = iio_enum_available_read, \
+ .private = (uintptr_t)(_e), \
+}
+
/**
* struct iio_chan_spec - specification of a single channel
* @type: What type of measurement is the channel making.
- * @channel: What number or name do we wish to assign the channel.
+ * @channel: What number do we wish to assign the channel.
* @channel2: If there is a second number for a differential
* channel then this is it. If modified is set then the
* value here specifies the modifier.
* @address: Driver specific identifier.
- * @scan_index: Monotonic index to give ordering in scans when read
+ * @scan_index: Monotonic index to give ordering in scans when read
* from a buffer.
* @scan_type: Sign: 's' or 'u' to specify signed or unsigned
* realbits: Number of valid bits of data
* endianness: little or big endian
* @info_mask: What information is to be exported about this channel.
* This includes calibbias, scale etc.
- * @event_mask: What events can this channel produce.
+ * @event_mask: What events can this channel produce.
* @ext_info: Array of extended info attributes for this channel.
* The array is NULL terminated, the last element should
- * have it's name field set to NULL.
+ * have its name field set to NULL.
* @extend_name: Allows labeling of channel attributes with an
* informative name. Note this has no effect codes etc,
* unlike modifiers.
- * @datasheet_name: A name used in in kernel mapping of channels. It should
+ * @datasheet_name: A name used in in-kernel mapping of channels. It should
* correspond to the first name that the channel is referred
* to by in the datasheet (e.g. IND), or the nearest
* possible compound name (e.g. IND-INC).
* channel2. Examples are IIO_MOD_X for axial sensors about
* the 'x' axis.
* @indexed: Specify the channel has a numerical index. If not,
- * the value in channel will be suppressed for attribute
- * but not for event codes. Typically set it to 0 when
- * the index is false.
+ * the channel index number will be suppressed for sysfs
+ * attributes but not for event codes.
* @differential: Channel is differential.
*/
struct iio_chan_spec {
* @predisable: [DRIVER] function to run prior to marking buffer
* disabled
* @postdisable: [DRIVER] function to run after marking buffer disabled
+ * @validate_scan_mask: [DRIVER] function callback to check whether a given
+ * scan mask is valid for the device.
*/
struct iio_buffer_setup_ops {
int (*preenable)(struct iio_dev *);
int (*postenable)(struct iio_dev *);
int (*predisable)(struct iio_dev *);
int (*postdisable)(struct iio_dev *);
+ bool (*validate_scan_mask)(struct iio_dev *indio_dev,
+ const unsigned long *scan_mask);
};
/**
* @trig: [INTERN] current device trigger (buffer modes)
* @pollfunc: [DRIVER] function run on trigger being received
* @channels: [DRIVER] channel specification structure table
- * @num_channels: [DRIVER] number of chanels specified in @channels.
+ * @num_channels: [DRIVER] number of channels specified in @channels.
* @channel_attr_list: [INTERN] keep track of automatically created channel
* attributes
* @chan_attr_group: [INTERN] group for all attrs in base directory
/**
* iio_device_put() - reference counted deallocation of struct device
- * @dev: the iio_device containing the device
+ * @indio_dev: IIO device structure containing the device
**/
static inline void iio_device_put(struct iio_dev *indio_dev)
{
/**
* dev_to_iio_dev() - Get IIO device struct from a device struct
- * @dev: The device embedded in the IIO device
+ * @dev: The device embedded in the IIO device
*
* Note: The device must be a IIO device, otherwise the result is undefined.
*/
return container_of(dev, struct iio_dev, dev);
}
+/**
+ * iio_device_get() - increment reference count for the device
+ * @indio_dev: IIO device structure
+ *
+ * Returns: The passed IIO device
+ **/
+static inline struct iio_dev *iio_device_get(struct iio_dev *indio_dev)
+{
+ return indio_dev ? dev_to_iio_dev(get_device(&indio_dev->dev)) : NULL;
+}
+
/* Can we make this smaller? */
#define IIO_ALIGN L1_CACHE_BYTES
/**
* iio_device_alloc() - allocate an iio_dev from a driver
- * @sizeof_priv: Space to allocate for private structure.
+ * @sizeof_priv: Space to allocate for private structure.
**/
struct iio_dev *iio_device_alloc(int sizeof_priv);
/**
* iio_device_free() - free an iio_dev from a driver
- * @dev: the iio_dev associated with the device
+ * @indio_dev: the iio_dev associated with the device
**/
void iio_device_free(struct iio_dev *indio_dev);
/**
* iio_buffer_enabled() - helper function to test if the buffer is enabled
- * @indio_dev: IIO device info structure for device
+ * @indio_dev: IIO device structure for device
**/
static inline bool iio_buffer_enabled(struct iio_dev *indio_dev)
{
/**
* iio_get_debugfs_dentry() - helper function to get the debugfs_dentry
- * @indio_dev: IIO device info structure for device
+ * @indio_dev: IIO device structure for device
**/
#if defined(CONFIG_DEBUG_FS)
static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
projects / cascardo / linux.git / blobdiff