/* SPDX-License-Identifier: GPL-2.0-only */ /* The industrial I/O core * * Copyright (c) 2008 Jonathan Cameron */ #ifndef _INDUSTRIAL_IO_H_ #define _INDUSTRIAL_IO_H_ #include <linux/device.h> #include <linux/cdev.h> #include <linux/cleanup.h> #include <linux/slab.h> #include <linux/iio/types.h> /* IIO TODO LIST */ /* * Provide means of adjusting timer accuracy. * Currently assumes nano seconds. */ struct fwnode_reference_args; enum iio_shared_by { … }; enum iio_endian { … }; struct iio_chan_spec; struct iio_dev; /** * struct iio_chan_spec_ext_info - Extended channel info attribute * @name: Info attribute name * @shared: Whether this attribute is shared between all channels. * @read: Read callback for this info attribute, may be NULL. * @write: Write callback for this info attribute, may be NULL. * @private: Data private to the driver. */ struct iio_chan_spec_ext_info { … }; /** * 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 { … }; 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 an iio_enum struct * * This should usually be used together with IIO_ENUM_AVAILABLE() */ #define IIO_ENUM(_name, _shared, _e) … /** * IIO_ENUM_AVAILABLE() - Initialize enum available extended channel attribute * @_name: Attribute name ("_available" will be appended to the name) * @_shared: Whether the attribute is shared between all channels * @_e: Pointer to an iio_enum struct * * Creates a read only attribute which lists all the available enum items in a * space separated list. This should usually be used together with IIO_ENUM() */ #define IIO_ENUM_AVAILABLE(_name, _shared, _e) … /** * struct iio_mount_matrix - iio mounting matrix * @rotation: 3 dimensional space rotation matrix defining sensor alignment with * main hardware */ struct iio_mount_matrix { … }; ssize_t iio_show_mount_matrix(struct iio_dev *indio_dev, uintptr_t priv, const struct iio_chan_spec *chan, char *buf); int iio_read_mount_matrix(struct device *dev, struct iio_mount_matrix *matrix); iio_get_mount_matrix_t; /** * IIO_MOUNT_MATRIX() - Initialize mount matrix extended channel attribute * @_shared: Whether the attribute is shared between all channels * @_get: Pointer to an iio_get_mount_matrix_t accessor */ #define IIO_MOUNT_MATRIX(_shared, _get) … /** * struct iio_event_spec - specification for a channel event * @type: Type of the event * @dir: Direction of the event * @mask_separate: Bit mask of enum iio_event_info values. Attributes * set in this mask will be registered per channel. * @mask_shared_by_type: Bit mask of enum iio_event_info values. Attributes * set in this mask will be shared by channel type. * @mask_shared_by_dir: Bit mask of enum iio_event_info values. Attributes * set in this mask will be shared by channel type and * direction. * @mask_shared_by_all: Bit mask of enum iio_event_info values. Attributes * set in this mask will be shared by all channels. */ struct iio_event_spec { … }; /** * struct iio_scan_type - specification for channel data format in buffer * @sign: 's' or 'u' to specify signed or unsigned * @realbits: Number of valid bits of data * @storagebits: Realbits + padding * @shift: Shift right by this before masking out realbits. * @repeat: Number of times real/storage bits repeats. When the * repeat element is more than 1, then the type element in * sysfs will show a repeat value. Otherwise, the number * of repetitions is omitted. * @endianness: little or big endian */ struct iio_scan_type { … }; /** * struct iio_chan_spec - specification of a single channel * @type: What type of measurement is the channel making. * @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 * from a buffer. * @scan_type: struct describing the scan type - mutually exclusive * with ext_scan_type. * @ext_scan_type: Used in rare cases where there is more than one scan * format for a channel. When this is used, the flag * has_ext_scan_type must be set and the driver must * implement get_current_scan_type in struct iio_info. * @num_ext_scan_type: Number of elements in ext_scan_type. * @info_mask_separate: What information is to be exported that is specific to * this channel. * @info_mask_separate_available: What availability information is to be * exported that is specific to this channel. * @info_mask_shared_by_type: What information is to be exported that is shared * by all channels of the same type. * @info_mask_shared_by_type_available: What availability information is to be * exported that is shared by all channels of the same * type. * @info_mask_shared_by_dir: What information is to be exported that is shared * by all channels of the same direction. * @info_mask_shared_by_dir_available: What availability information is to be * exported that is shared by all channels of the same * direction. * @info_mask_shared_by_all: What information is to be exported that is shared * by all channels. * @info_mask_shared_by_all_available: What availability information is to be * exported that is shared by all channels. * @event_spec: Array of events which should be registered for this * channel. * @num_event_specs: Size of the event_spec array. * @ext_info: Array of extended info attributes for this channel. * The array is NULL terminated, the last element should * 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. * This field is deprecated in favour of providing * iio_info->read_label() to override the label, which * unlike @extend_name does not affect sysfs filenames. * @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). * @modified: Does a modifier apply to this channel. What these are * depends on the channel type. Modifier is set in * channel2. Examples are IIO_MOD_X for axial sensors about * the 'x' axis. * @indexed: Specify the channel has a numerical index. If not, * the channel index number will be suppressed for sysfs * attributes but not for event codes. * @output: Channel is output. * @differential: Channel is differential. * @has_ext_scan_type: True if ext_scan_type is used instead of scan_type. */ struct iio_chan_spec { … }; /** * iio_channel_has_info() - Checks whether a channel supports a info attribute * @chan: The channel to be queried * @type: Type of the info attribute to be checked * * Returns true if the channels supports reporting values for the given info * attribute type, false otherwise. */ static inline bool iio_channel_has_info(const struct iio_chan_spec *chan, enum iio_chan_info_enum type) { … } /** * iio_channel_has_available() - Checks if a channel has an available attribute * @chan: The channel to be queried * @type: Type of the available attribute to be checked * * Returns true if the channel supports reporting available values for the * given attribute type, false otherwise. */ static inline bool iio_channel_has_available(const struct iio_chan_spec *chan, enum iio_chan_info_enum type) { … } #define IIO_CHAN_SOFT_TIMESTAMP(_si) … s64 iio_get_time_ns(const struct iio_dev *indio_dev); /* * Device operating modes * @INDIO_DIRECT_MODE: There is an access to either: * a) The last single value available for devices that do not provide * on-demand reads. * b) A new value after performing an on-demand read otherwise. * On most devices, this is a single-shot read. On some devices with data * streams without an 'on-demand' function, this might also be the 'last value' * feature. Above all, this mode internally means that we are not in any of the * other modes, and sysfs reads should work. * Device drivers should inform the core if they support this mode. * @INDIO_BUFFER_TRIGGERED: Common mode when dealing with kfifo buffers. * It indicates that an explicit trigger is required. This requests the core to * attach a poll function when enabling the buffer, which is indicated by the * _TRIGGERED suffix. * The core will ensure this mode is set when registering a triggered buffer * with iio_triggered_buffer_setup(). * @INDIO_BUFFER_SOFTWARE: Another kfifo buffer mode, but not event triggered. * No poll function can be attached because there is no triggered infrastructure * we can use to cause capture. There is a kfifo that the driver will fill, but * not "only one scan at a time". Typically, hardware will have a buffer that * can hold multiple scans. Software may read one or more scans at a single time * and push the available data to a Kfifo. This means the core will not attach * any poll function when enabling the buffer. * The core will ensure this mode is set when registering a simple kfifo buffer * with devm_iio_kfifo_buffer_setup(). * @INDIO_BUFFER_HARDWARE: For specific hardware, if unsure do not use this mode. * Same as above but this time the buffer is not a kfifo where we have direct * access to the data. Instead, the consumer driver must access the data through * non software visible channels (or DMA when there is no demux possible in * software) * The core will ensure this mode is set when registering a dmaengine buffer * with devm_iio_dmaengine_buffer_setup(). * @INDIO_EVENT_TRIGGERED: Very unusual mode. * Triggers usually refer to an external event which will start data capture. * Here it is kind of the opposite as, a particular state of the data might * produce an event which can be considered as an event. We don't necessarily * have access to the data itself, but to the event produced. For example, this * can be a threshold detector. The internal path of this mode is very close to * the INDIO_BUFFER_TRIGGERED mode. * The core will ensure this mode is set when registering a triggered event. * @INDIO_HARDWARE_TRIGGERED: Very unusual mode. * Here, triggers can result in data capture and can be routed to multiple * hardware components, which make them close to regular triggers in the way * they must be managed by the core, but without the entire interrupts/poll * functions burden. Interrupts are irrelevant as the data flow is hardware * mediated and distributed. */ #define INDIO_DIRECT_MODE … #define INDIO_BUFFER_TRIGGERED … #define INDIO_BUFFER_SOFTWARE … #define INDIO_BUFFER_HARDWARE … #define INDIO_EVENT_TRIGGERED … #define INDIO_HARDWARE_TRIGGERED … #define INDIO_ALL_BUFFER_MODES … #define INDIO_ALL_TRIGGERED_MODES … #define INDIO_MAX_RAW_ELEMENTS … struct iio_val_int_plus_micro { … }; struct iio_trigger; /* forward declaration */ /** * struct iio_info - constant information about device * @event_attrs: event control attributes * @attrs: general purpose device attributes * @read_raw: function to request a value from the device. * mask specifies which value. Note 0 means a reading of * the channel in question. Return value will specify the * type of value returned by the device. val and val2 will * contain the elements making up the returned value. * @read_raw_multi: function to return values from the device. * mask specifies which value. Note 0 means a reading of * the channel in question. Return value will specify the * type of value returned by the device. vals pointer * contain the elements making up the returned value. * max_len specifies maximum number of elements * vals pointer can contain. val_len is used to return * length of valid elements in vals. * @read_avail: function to return the available values from the device. * mask specifies which value. Note 0 means the available * values for the channel in question. Return value * specifies if a IIO_AVAIL_LIST or a IIO_AVAIL_RANGE is * returned in vals. The type of the vals are returned in * type and the number of vals is returned in length. For * ranges, there are always three vals returned; min, step * and max. For lists, all possible values are enumerated. * @write_raw: function to write a value to the device. * Parameters are the same as for read_raw. * @read_label: function to request label name for a specified label, * for better channel identification. * @write_raw_get_fmt: callback function to query the expected * format/precision. If not set by the driver, write_raw * returns IIO_VAL_INT_PLUS_MICRO. * @read_event_config: find out if the event is enabled. * @write_event_config: set if the event is enabled. * @read_event_value: read a configuration value associated with the event. * @write_event_value: write a configuration value for the event. * @read_event_label: function to request label name for a specified label, * for better event identification. * @validate_trigger: function to validate the trigger when the * current trigger gets changed. * @get_current_scan_type: must be implemented by drivers that use ext_scan_type * in the channel spec to return the index of the currently * active ext_scan type for a channel. * @update_scan_mode: function to configure device and scan buffer when * channels have changed * @debugfs_reg_access: function to read or write register value of device * @fwnode_xlate: fwnode based function pointer to obtain channel specifier index. * @hwfifo_set_watermark: function pointer to set the current hardware * fifo watermark level; see hwfifo_* entries in * Documentation/ABI/testing/sysfs-bus-iio for details on * how the hardware fifo operates * @hwfifo_flush_to_buffer: function pointer to flush the samples stored * in the hardware fifo to the device buffer. The driver * should not flush more than count samples. The function * must return the number of samples flushed, 0 if no * samples were flushed or a negative integer if no samples * were flushed and there was an error. **/ struct iio_info { … }; /** * struct iio_buffer_setup_ops - buffer setup related callbacks * @preenable: [DRIVER] function to run prior to marking buffer enabled * @postenable: [DRIVER] function to run after marking buffer enabled * @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 { … }; /** * struct iio_dev - industrial I/O device * @modes: [DRIVER] bitmask listing all the operating modes * supported by the IIO device. This list should be * initialized before registering the IIO device. It can * also be filed up by the IIO core, as a result of * enabling particular features in the driver * (see iio_triggered_event_setup()). * @dev: [DRIVER] device structure, should be assigned a parent * and owner * @buffer: [DRIVER] any buffer present * @scan_bytes: [INTERN] num bytes captured to be fed to buffer demux * @available_scan_masks: [DRIVER] optional array of allowed bitmasks. Sort the * array in order of preference, the most preferred * masks first. * @masklength: [INTERN] the length of the mask established from * channels * @active_scan_mask: [INTERN] union of all scan masks requested by buffers * @scan_timestamp: [INTERN] set if any buffers have requested timestamp * @trig: [INTERN] current device trigger (buffer modes) * @pollfunc: [DRIVER] function run on trigger being received * @pollfunc_event: [DRIVER] function run on events trigger being received * @channels: [DRIVER] channel specification structure table * @num_channels: [DRIVER] number of channels specified in @channels. * @name: [DRIVER] name of the device. * @label: [DRIVER] unique name to identify which device this is * @info: [DRIVER] callbacks and constant info from driver * @setup_ops: [DRIVER] callbacks to call before and after buffer * enable/disable * @priv: [DRIVER] reference to driver's private information * **MUST** be accessed **ONLY** via iio_priv() helper */ struct iio_dev { … }; int iio_device_id(struct iio_dev *indio_dev); int iio_device_get_current_mode(struct iio_dev *indio_dev); bool iio_buffer_enabled(struct iio_dev *indio_dev); const struct iio_chan_spec *iio_find_channel_from_si(struct iio_dev *indio_dev, int si); /** * iio_device_register() - register a device with the IIO subsystem * @indio_dev: Device structure filled by the device driver **/ #define iio_device_register(indio_dev) … int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod); void iio_device_unregister(struct iio_dev *indio_dev); /** * devm_iio_device_register - Resource-managed iio_device_register() * @dev: Device to allocate iio_dev for * @indio_dev: Device structure filled by the device driver * * Managed iio_device_register. The IIO device registered with this * function is automatically unregistered on driver detach. This function * calls iio_device_register() internally. Refer to that function for more * information. * * RETURNS: * 0 on success, negative error number on failure. */ #define devm_iio_device_register(dev, indio_dev) … int __devm_iio_device_register(struct device *dev, struct iio_dev *indio_dev, struct module *this_mod); int iio_push_event(struct iio_dev *indio_dev, u64 ev_code, s64 timestamp); int iio_device_claim_direct_mode(struct iio_dev *indio_dev); void iio_device_release_direct_mode(struct iio_dev *indio_dev); /* * This autocleanup logic is normally used via * iio_device_claim_direct_scoped(). */ DEFINE_GUARD(iio_claim_direct, struct iio_dev *, iio_device_claim_direct_mode(_T), iio_device_release_direct_mode(_T)) DEFINE_GUARD_COND(iio_claim_direct, _try, ({ … } /** * iio_device_claim_direct_scoped() - Scoped call to iio_device_claim_direct. * @fail: What to do on failure to claim device. * @iio_dev: Pointer to the IIO devices structure */ #define iio_device_claim_direct_scoped(fail, iio_dev) … int iio_device_claim_buffer_mode(struct iio_dev *indio_dev); void iio_device_release_buffer_mode(struct iio_dev *indio_dev); extern const struct bus_type iio_bus_type; /** * iio_device_put() - reference counted deallocation of struct device * @indio_dev: IIO device structure containing the device **/ static inline void iio_device_put(struct iio_dev *indio_dev) { … } clockid_t iio_device_get_clock(const struct iio_dev *indio_dev); int iio_device_set_clock(struct iio_dev *indio_dev, clockid_t clock_id); /** * dev_to_iio_dev() - Get IIO device struct from a device struct * @dev: The device embedded in the IIO device * * Note: The device must be a IIO device, otherwise the result is undefined. */ static inline struct iio_dev *dev_to_iio_dev(struct device *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) { … } /** * iio_device_set_parent() - assign parent device to the IIO device object * @indio_dev: IIO device structure * @parent: reference to parent device object * * This utility must be called between IIO device allocation * (via devm_iio_device_alloc()) & IIO device registration * (via iio_device_register() and devm_iio_device_register())). * By default, the device allocation will also assign a parent device to * the IIO device object. In cases where devm_iio_device_alloc() is used, * sometimes the parent device must be different than the device used to * manage the allocation. * In that case, this helper should be used to change the parent, hence the * requirement to call this between allocation & registration. **/ static inline void iio_device_set_parent(struct iio_dev *indio_dev, struct device *parent) { … } /** * iio_device_set_drvdata() - Set device driver data * @indio_dev: IIO device structure * @data: Driver specific data * * Allows to attach an arbitrary pointer to an IIO device, which can later be * retrieved by iio_device_get_drvdata(). */ static inline void iio_device_set_drvdata(struct iio_dev *indio_dev, void *data) { … } /** * iio_device_get_drvdata() - Get device driver data * @indio_dev: IIO device structure * * Returns the data previously set with iio_device_set_drvdata() */ static inline void *iio_device_get_drvdata(const struct iio_dev *indio_dev) { … } /* * Used to ensure the iio_priv() structure is aligned to allow that structure * to in turn include IIO_DMA_MINALIGN'd elements such as buffers which * must not share cachelines with the rest of the structure, thus making * them safe for use with non-coherent DMA. */ #define IIO_DMA_MINALIGN … struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv); /* The information at the returned address is guaranteed to be cacheline aligned */ static inline void *iio_priv(const struct iio_dev *indio_dev) { … } void iio_device_free(struct iio_dev *indio_dev); struct iio_dev *devm_iio_device_alloc(struct device *parent, int sizeof_priv); #define devm_iio_trigger_alloc(parent, fmt, ...) … __printf(3, 4) struct iio_trigger *__devm_iio_trigger_alloc(struct device *parent, struct module *this_mod, const char *fmt, ...); /** * iio_get_debugfs_dentry() - helper function to get the debugfs_dentry * @indio_dev: IIO device structure for device **/ #if defined(CONFIG_DEBUG_FS) struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev); #else static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev) { return NULL; } #endif #ifdef CONFIG_ACPI bool iio_read_acpi_mount_matrix(struct device *dev, struct iio_mount_matrix *orientation, char *acpi_method); #else static inline bool iio_read_acpi_mount_matrix(struct device *dev, struct iio_mount_matrix *orientation, char *acpi_method) { return false; } #endif /** * iio_get_current_scan_type - Get the current scan type for a channel * @indio_dev: the IIO device to get the scan type for * @chan: the channel to get the scan type for * * Most devices only have one scan type per channel and can just access it * directly without calling this function. Core IIO code and drivers that * implement ext_scan_type in the channel spec should use this function to * get the current scan type for a channel. * * Returns: the current scan type for the channel or error. */ static inline const struct iio_scan_type *iio_get_current_scan_type(const struct iio_dev *indio_dev, const struct iio_chan_spec *chan) { … } ssize_t iio_format_value(char *buf, unsigned int type, int size, int *vals); int iio_str_to_fixpoint(const char *str, int fract_mult, int *integer, int *fract); /** * IIO_DEGREE_TO_RAD() - Convert degree to rad * @deg: A value in degree * * Returns the given value converted from degree to rad */ #define IIO_DEGREE_TO_RAD(deg) … /** * IIO_RAD_TO_DEGREE() - Convert rad to degree * @rad: A value in rad * * Returns the given value converted from rad to degree */ #define IIO_RAD_TO_DEGREE(rad) … /** * IIO_G_TO_M_S_2() - Convert g to meter / second**2 * @g: A value in g * * Returns the given value converted from g to meter / second**2 */ #define IIO_G_TO_M_S_2(g) … /** * IIO_M_S_2_TO_G() - Convert meter / second**2 to g * @ms2: A value in meter / second**2 * * Returns the given value converted from meter / second**2 to g */ #define IIO_M_S_2_TO_G(ms2) … #endif /* _INDUSTRIAL_IO_H_ */
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