451 lines
12 KiB
C
451 lines
12 KiB
C
/* The industrial I/O core
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*
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* Copyright (c) 2008 Jonathan Cameron
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#ifndef _INDUSTRIAL_IO_H_
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#define _INDUSTRIAL_IO_H_
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#include <linux/device.h>
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#include <linux/cdev.h>
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#include "sysfs.h"
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#include "chrdev.h"
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/* IIO TODO LIST */
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/* Static device specific elements (conversion factors etc)
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* should be exported via sysfs
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*
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* Provide means of adjusting timer accuracy.
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* Currently assumes nano seconds.
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*/
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/* Event interface flags */
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#define IIO_BUSY_BIT_POS 1
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struct iio_dev;
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/**
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* iio_get_time_ns() - utility function to get a time stamp for events etc
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**/
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static inline s64 iio_get_time_ns(void)
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{
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struct timespec ts;
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/*
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* calls getnstimeofday.
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* If hrtimers then up to ns accurate, if not microsecond.
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*/
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ktime_get_real_ts(&ts);
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return timespec_to_ns(&ts);
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}
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/**
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* iio_add_event_to_list() - Wraps adding to event lists
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* @el: the list element of the event to be handled.
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* @head: the list associated with the event handler being used.
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*
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* Does reference counting to allow shared handlers.
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**/
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void iio_add_event_to_list(struct iio_event_handler_list *el,
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struct list_head *head);
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/**
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* iio_remove_event_from_list() - Wraps removing from event list
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* @el: element to be removed
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* @head: associate list head for the interrupt handler.
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*
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* Does reference counting to allow shared handlers.
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**/
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void iio_remove_event_from_list(struct iio_event_handler_list *el,
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struct list_head *head);
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/* Device operating modes */
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#define INDIO_DIRECT_MODE 0x01
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#define INDIO_RING_TRIGGERED 0x02
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#define INDIO_RING_HARDWARE_BUFFER 0x08
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#define INDIO_ALL_RING_MODES (INDIO_RING_TRIGGERED | INDIO_RING_HARDWARE_BUFFER)
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/* Vast majority of this is set by the industrialio subsystem on a
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* call to iio_device_register. */
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/**
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* struct iio_dev - industrial I/O device
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* @id: [INTERN] used to identify device internally
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* @dev_data: [DRIVER] device specific data
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* @modes: [DRIVER] operating modes supported by device
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* @currentmode: [DRIVER] current operating mode
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* @dev: [DRIVER] device structure, should be assigned a parent
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* and owner
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* @attrs: [DRIVER] general purpose device attributes
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* @driver_module: [DRIVER] module structure used to ensure correct
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* ownership of chrdevs etc
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* @num_interrupt_lines:[DRIVER] number of physical interrupt lines from device
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* @interrupts: [INTERN] interrupt line specific event lists etc
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* @event_attrs: [DRIVER] event control attributes
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* @event_conf_attrs: [DRIVER] event configuration attributes
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* @event_interfaces: [INTERN] event chrdevs associated with interrupt lines
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* @ring: [DRIVER] any ring buffer present
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* @mlock: [INTERN] lock used to prevent simultaneous device state
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* changes
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* @scan_el_attrs: [DRIVER] control of scan elements if that scan mode
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* control method is used
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* @scan_count: [INTERN] the number of elements in the current scan mode
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* @scan_mask: [INTERN] bitmask used in masking scan mode elements
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* @available_scan_masks: [DRIVER] optional array of allowed bitmasks
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* @scan_timestamp: [INTERN] does the scan mode include a timestamp
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* @trig: [INTERN] current device trigger (ring buffer modes)
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* @pollfunc: [DRIVER] function run on trigger being recieved
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**/
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struct iio_dev {
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int id;
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void *dev_data;
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int modes;
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int currentmode;
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struct device dev;
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const struct attribute_group *attrs;
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struct module *driver_module;
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int num_interrupt_lines;
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struct iio_interrupt **interrupts;
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struct attribute_group *event_attrs;
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struct attribute_group *event_conf_attrs;
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struct iio_event_interface *event_interfaces;
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struct iio_ring_buffer *ring;
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struct mutex mlock;
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struct attribute_group *scan_el_attrs;
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int scan_count;
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u32 scan_mask;
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u32 *available_scan_masks;
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bool scan_timestamp;
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struct iio_trigger *trig;
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struct iio_poll_func *pollfunc;
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};
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/*
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* These are mainly provided to allow for a change of implementation if a device
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* has a large number of scan elements
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*/
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#define IIO_MAX_SCAN_LENGTH 31
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/* note 0 used as error indicator as it doesn't make sense. */
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static inline u32 iio_scan_mask_match(u32 *av_masks, u32 mask)
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{
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while (*av_masks) {
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if (!(~*av_masks & mask))
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return *av_masks;
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av_masks++;
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}
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return 0;
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}
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static inline int iio_scan_mask_query(struct iio_dev *dev_info, int bit)
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{
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u32 mask;
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if (bit > IIO_MAX_SCAN_LENGTH)
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return -EINVAL;
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if (!dev_info->scan_mask)
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return 0;
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if (dev_info->available_scan_masks)
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mask = iio_scan_mask_match(dev_info->available_scan_masks,
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dev_info->scan_mask);
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else
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mask = dev_info->scan_mask;
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if (!mask)
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return -EINVAL;
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return !!(mask & (1 << bit));
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};
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static inline int iio_scan_mask_set(struct iio_dev *dev_info, int bit)
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{
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u32 mask;
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u32 trialmask = dev_info->scan_mask | (1 << bit);
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if (bit > IIO_MAX_SCAN_LENGTH)
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return -EINVAL;
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if (dev_info->available_scan_masks) {
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mask = iio_scan_mask_match(dev_info->available_scan_masks,
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trialmask);
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if (!mask)
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return -EINVAL;
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}
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dev_info->scan_mask = trialmask;
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dev_info->scan_count++;
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return 0;
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};
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static inline int iio_scan_mask_clear(struct iio_dev *dev_info, int bit)
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{
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if (bit > IIO_MAX_SCAN_LENGTH)
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return -EINVAL;
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dev_info->scan_mask &= ~(1 << bit);
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dev_info->scan_count--;
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return 0;
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};
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/**
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* iio_scan_mask_count_to_right() - how many scan elements occur before here
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* @dev_info: the iio_device whose scan mode we are querying
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* @bit: which number scan element is this
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**/
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static inline int iio_scan_mask_count_to_right(struct iio_dev *dev_info,
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int bit)
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{
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int count = 0;
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int mask = (1 << bit);
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if (bit > IIO_MAX_SCAN_LENGTH)
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return -EINVAL;
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while (mask) {
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mask >>= 1;
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if (mask & dev_info->scan_mask)
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count++;
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}
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return count;
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}
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/**
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* iio_device_register() - register a device with the IIO subsystem
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* @dev_info: Device structure filled by the device driver
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**/
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int iio_device_register(struct iio_dev *dev_info);
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/**
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* iio_device_unregister() - unregister a device from the IIO subsystem
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* @dev_info: Device structure representing the device.
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**/
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void iio_device_unregister(struct iio_dev *dev_info);
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/**
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* struct iio_interrupt - wrapper used to allow easy handling of multiple
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* physical interrupt lines
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* @dev_info: the iio device for which the is an interrupt line
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* @line_number: associated line number
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* @id: idr allocated unique id number
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* @irq: associate interrupt number
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* @ev_list: event handler list for associated events
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* @ev_list_lock: ensure only one access to list at a time
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**/
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struct iio_interrupt {
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struct iio_dev *dev_info;
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int line_number;
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int id;
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int irq;
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struct list_head ev_list;
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spinlock_t ev_list_lock;
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};
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#define to_iio_interrupt(i) container_of(i, struct iio_interrupt, ev_list)
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/**
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* iio_register_interrupt_line() - Tell IIO about interrupt lines
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*
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* @irq: Typically provided via platform data
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* @dev_info: IIO device info structure for device
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* @line_number: Which interrupt line of the device is this?
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* @type: Interrupt type (e.g. edge triggered etc)
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* @name: Identifying name.
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**/
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int iio_register_interrupt_line(unsigned int irq,
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struct iio_dev *dev_info,
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int line_number,
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unsigned long type,
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const char *name);
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void iio_unregister_interrupt_line(struct iio_dev *dev_info,
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int line_number);
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/**
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* iio_push_event() - try to add event to the list for userspace reading
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* @dev_info: IIO device structure
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* @ev_line: Which event line (hardware interrupt)
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* @ev_code: What event
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* @timestamp: When the event occurred
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**/
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int iio_push_event(struct iio_dev *dev_info,
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int ev_line,
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int ev_code,
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s64 timestamp);
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/**
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* struct iio_work_cont - container for when singleton handler case matters
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* @ws: [DEVICE] work_struct when not only possible event
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* @ws_nocheck: [DEVICE] work_struct when only possible event
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* @address: [DEVICE] associated register address
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* @mask: [DEVICE] associated mask for identifying event source
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* @st: [DEVICE] device specific state information
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**/
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struct iio_work_cont {
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struct work_struct ws;
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struct work_struct ws_nocheck;
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int address;
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int mask;
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void *st;
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};
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#define to_iio_work_cont_check(_ws) \
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container_of(_ws, struct iio_work_cont, ws)
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#define to_iio_work_cont_no_check(_ws) \
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container_of(_ws, struct iio_work_cont, ws_nocheck)
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/**
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* iio_init_work_cont() - intiialize the elements of a work container
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* @cont: the work container
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* @_checkfunc: function called when there are multiple possible int sources
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* @_nocheckfunc: function for when there is only one int source
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* @_add: driver dependent, typically a register address
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* @_mask: driver dependent, typically a bit mask for a register
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* @_st: driver dependent, typically pointer to a device state structure
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**/
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static inline void
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iio_init_work_cont(struct iio_work_cont *cont,
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void (*_checkfunc)(struct work_struct *),
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void (*_nocheckfunc)(struct work_struct *),
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int _add, int _mask, void *_st)
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{
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INIT_WORK(&(cont)->ws, _checkfunc);
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INIT_WORK(&(cont)->ws_nocheck, _nocheckfunc);
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cont->address = _add;
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cont->mask = _mask;
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cont->st = _st;
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}
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/**
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* __iio_push_event() - tries to add an event to the list associated with a chrdev
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* @ev_int: the event interface to which we are pushing the event
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* @ev_code: the outgoing event code
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* @timestamp: timestamp of the event
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* @shared_pointer_p: the shared event pointer
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**/
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int __iio_push_event(struct iio_event_interface *ev_int,
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int ev_code,
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s64 timestamp,
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struct iio_shared_ev_pointer*
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shared_pointer_p);
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/**
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* __iio_change_event() - change an event code in case of event escalation
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* @ev: the event to be changed
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* @ev_code: new event code
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* @timestamp: new timestamp
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**/
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void __iio_change_event(struct iio_detected_event_list *ev,
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int ev_code,
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s64 timestamp);
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/**
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* iio_setup_ev_int() - configure an event interface (chrdev)
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* @name: name used for resulting sysfs directory etc.
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* @ev_int: interface we are configuring
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* @owner: module that is responsible for registering this ev_int
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* @dev: device whose ev_int this is
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**/
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int iio_setup_ev_int(struct iio_event_interface *ev_int,
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const char *name,
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struct module *owner,
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struct device *dev);
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void iio_free_ev_int(struct iio_event_interface *ev_int);
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/**
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* iio_allocate_chrdev() - Allocate a chrdev
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* @handler: struct that contains relevant file handling for chrdev
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* @dev_info: iio_dev for which chrdev is being created
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**/
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int iio_allocate_chrdev(struct iio_handler *handler, struct iio_dev *dev_info);
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void iio_deallocate_chrdev(struct iio_handler *handler);
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/* Used to distinguish between bipolar and unipolar scan elemenents.
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* Whilst this may seem obvious, we may well want to change the representation
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* in the future!*/
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#define IIO_SIGNED(a) -(a)
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#define IIO_UNSIGNED(a) (a)
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extern dev_t iio_devt;
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extern struct bus_type iio_bus_type;
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/**
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* iio_put_device() - reference counted deallocation of struct device
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* @dev: the iio_device containing the device
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**/
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static inline void iio_put_device(struct iio_dev *dev)
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{
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if (dev)
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put_device(&dev->dev);
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};
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/**
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* to_iio_dev() - get iio_dev for which we have the struct device
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* @d: the struct device
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**/
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static inline struct iio_dev *to_iio_dev(struct device *d)
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{
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return container_of(d, struct iio_dev, dev);
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};
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/**
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* iio_dev_get_devdata() - helper function gets device specific data
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* @d: the iio_dev associated with the device
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**/
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static inline void *iio_dev_get_devdata(struct iio_dev *d)
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{
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return d->dev_data;
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}
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/**
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* iio_allocate_device() - allocate an iio_dev from a driver
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**/
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struct iio_dev *iio_allocate_device(void);
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/**
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* iio_free_device() - free an iio_dev from a driver
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* @dev: the iio_dev associated with the device
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**/
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void iio_free_device(struct iio_dev *dev);
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/**
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* iio_put() - internal module reference count reduce
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**/
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void iio_put(void);
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/**
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* iio_get() - internal module reference count increase
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**/
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void iio_get(void);
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/* Ring buffer related */
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int iio_device_get_chrdev_minor(void);
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void iio_device_free_chrdev_minor(int val);
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/**
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* iio_ring_enabled() - helper function to test if any form of ring is enabled
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* @dev_info: IIO device info structure for device
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**/
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static inline bool iio_ring_enabled(struct iio_dev *dev_info)
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{
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return dev_info->currentmode
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& (INDIO_RING_TRIGGERED
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| INDIO_RING_HARDWARE_BUFFER);
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};
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struct idr;
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int iio_get_new_idr_val(struct idr *this_idr);
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void iio_free_idr_val(struct idr *this_idr, int id);
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#endif /* _INDUSTRIAL_IO_H_ */
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