From 847ec80bbaa76aae41062d6802cea9c1b2289f14 Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Tue, 18 Aug 2009 18:06:19 +0100 Subject: Staging: IIO: core support for device registration and management Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/staging/iio/Kconfig | 11 + drivers/staging/iio/Makefile | 6 + drivers/staging/iio/chrdev.h | 118 +++++ drivers/staging/iio/iio.h | 411 +++++++++++++++ drivers/staging/iio/industrialio-core.c | 851 ++++++++++++++++++++++++++++++++ drivers/staging/iio/sysfs.h | 293 +++++++++++ drivers/staging/iio/trigger_consumer.h | 26 + 7 files changed, 1716 insertions(+) create mode 100644 drivers/staging/iio/Kconfig create mode 100644 drivers/staging/iio/Makefile create mode 100644 drivers/staging/iio/chrdev.h create mode 100644 drivers/staging/iio/iio.h create mode 100644 drivers/staging/iio/industrialio-core.c create mode 100644 drivers/staging/iio/sysfs.h create mode 100644 drivers/staging/iio/trigger_consumer.h (limited to 'drivers/staging/iio') diff --git a/drivers/staging/iio/Kconfig b/drivers/staging/iio/Kconfig new file mode 100644 index 000000000000..09e4101939ef --- /dev/null +++ b/drivers/staging/iio/Kconfig @@ -0,0 +1,11 @@ +# +# Industrial I/O subsytem configuration +# + +menuconfig IIO + tristate "Industrial I/O support" + ---help--- + The industrial I/O subsystem provides a unified framework for + drivers for many different types of embedded sensors using a + number of different physical interfaces (i2c, spi etc). See + Documentation/industrialio for more information. diff --git a/drivers/staging/iio/Makefile b/drivers/staging/iio/Makefile new file mode 100644 index 000000000000..92b462a125e8 --- /dev/null +++ b/drivers/staging/iio/Makefile @@ -0,0 +1,6 @@ +# +# Makefile for the industrial I/O core. +# + +obj-$(CONFIG_IIO) += industrialio.o +industrialio-y := industrialio-core.o diff --git a/drivers/staging/iio/chrdev.h b/drivers/staging/iio/chrdev.h new file mode 100644 index 000000000000..8bc64bf08459 --- /dev/null +++ b/drivers/staging/iio/chrdev.h @@ -0,0 +1,118 @@ +/* The industrial I/O core - character device related + * + * Copyright (c) 2008 Jonathan Cameron + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ + +#ifndef _IIO_CHRDEV_H_ +#define _IIO_CHRDEV_H_ +struct iio_dev; + +/** + * struct iio_handler - Structure used to specify file operations + * for a particular chrdev + * @chrdev: character device structure + * @id: the location in the handler table - used for deallocation. + * @flags: file operations related flags including busy flag. + * @private: handler specific data used by the fileops registered with + * the chrdev. + */ +struct iio_handler { + struct cdev chrdev; + int id; + unsigned long flags; + void *private; +}; + +#define iio_cdev_to_handler(cd) \ + container_of(cd, struct iio_handler, chrdev) + +/** + * struct iio_event_data - The actual event being pushed to userspace + * @id: event identifier + * @timestamp: best estimate of time of event occurance (often from + * the interrupt handler) + */ +struct iio_event_data { + int id; + s64 timestamp; +}; + +/** + * struct iio_detected_event_list - list element for events that have occured + * @list: linked list header + * @ev: the event itself + * @shared_pointer: used when the event is shared - i.e. can be escallated + * on demand (eg ring buffer 50%->100% full) + */ +struct iio_detected_event_list { + struct list_head list; + struct iio_event_data ev; + struct iio_shared_ev_pointer *shared_pointer; +}; +/** + * struct iio_shared_ev_pointer - allows shared events to identify if currently + * in the detected event list + * @ev_p: pointer to detected event list element (null if not in list) + * @lock: protect this element to prevent simultaneous edit and remove + */ +struct iio_shared_ev_pointer { + struct iio_detected_event_list *ev_p; + spinlock_t lock; +}; + +/** + * struct iio_event_interface - chrdev interface for an event line + * @dev: device assocated with event interface + * @handler: fileoperations and related control for the chrdev + * @wait: wait queue to allow blocking reads of events + * @event_list_lock: mutex to protect the list of detected events + * @det_events: list of detected events + * @max_events: maximum number of events before new ones are dropped + * @current_events: number of events in detected list + * @id: indentifier to allow the event interface to know which + * physical line it corresponds to + * @owner: ensure the driver module owns the file, not iio + * @private: driver specific data + * @_name: used internally to store the sysfs name for minor id + * attribute + */ +struct iio_event_interface { + struct device dev; + struct iio_handler handler; + wait_queue_head_t wait; + struct mutex event_list_lock; + struct iio_detected_event_list det_events; + int max_events; + int current_events; + int id; + struct iio_chrdev_minor_attr attr; + struct module *owner; + void *private; + char _name[20]; + char _attrname[20]; +}; + +/** + * struct iio_event_handler_list - element in list of handlers for events + * @list: list header + * @refcount: as the handler may be shared between multiple device + * side events, reference counting ensures clean removal + * @exist_lock: prevents race conditions related to refcount useage. + * @handler: event handler function - called on event if this + * event_handler is enabled. + * + * Each device has one list of these per interrupt line + **/ +struct iio_event_handler_list { + struct list_head list; + int refcount; + struct mutex exist_lock; + int (*handler)(struct iio_dev *dev_info, int index, s64 timestamp, + int no_test); +}; + +#endif diff --git a/drivers/staging/iio/iio.h b/drivers/staging/iio/iio.h new file mode 100644 index 000000000000..25ccb809221e --- /dev/null +++ b/drivers/staging/iio/iio.h @@ -0,0 +1,411 @@ +/* The industrial I/O core + * + * Copyright (c) 2008 Jonathan Cameron + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ + +#ifndef _INDUSTRIAL_IO_H_ +#define _INDUSTRIAL_IO_H_ + +#include +#include +#include "sysfs.h" +#include "chrdev.h" + +/* IIO TODO LIST */ +/* Static device specific elements (conversion factors etc) + * should be exported via sysfs + * + * Provide means of adjusting timer accuracy. + * Currently assumes nano seconds. + */ + +/* Event interface flags */ +#define IIO_BUSY_BIT_POS 1 + +struct iio_dev; + +/** + * iio_get_time_ns() - utility function to get a time stamp for events etc + **/ +static inline s64 iio_get_time_ns(void) +{ + struct timespec ts; + /* + * calls getnstimeofday. + * If hrtimers then up to ns accurate, if not microsecond. + */ + ktime_get_real_ts(&ts); + + return timespec_to_ns(&ts); +} + +/** + * iio_add_event_to_list() - Wraps adding to event lists + * @el: the list element of the event to be handled. + * @head: the list associated with the event handler being used. + * + * Does reference counting to allow shared handlers. + **/ +void iio_add_event_to_list(struct iio_event_handler_list *el, + struct list_head *head); + +/** + * iio_remove_event_from_list() - Wraps removing from event list + * @el: element to be removed + * @head: associate list head for the interrupt handler. + * + * Does reference counting to allow shared handlers. + **/ +void iio_remove_event_from_list(struct iio_event_handler_list *el, + struct list_head *head); + +/* Device operating modes */ +#define INDIO_DIRECT_MODE 0x01 +#define INDIO_RING_TRIGGERED 0x02 +#define INDIO_RING_HARDWARE_BUFFER 0x08 + +#define INDIO_ALL_RING_MODES (INDIO_RING_TRIGGERED | INDIO_RING_HARDWARE_BUFFER) + +/* Vast majority of this is set by the industrialio subsystem on a + * call to iio_device_register. */ + +/** + * struct iio_dev - industrial I/O device + * @id: [INTERN] used to identify device internally + * @dev_data: [DRIVER] device specific data + * @modes: [DRIVER] operating modes supported by device + * @currentmode: [DRIVER] current operating mode + * @dev: [DRIVER] device structure, should be assigned a parent + * and owner + * @attrs: [DRIVER] general purpose device attributes + * @driver_module: [DRIVER] module structure used to ensure correct + * ownership of chrdevs etc + * @num_interrupt_lines:[DRIVER] number of physical interrupt lines from device + * @interrupts: [INTERN] interrupt line specific event lists etc + * @event_attrs: [DRIVER] event control attributes + * @event_conf_attrs: [DRIVER] event configuration attributes + * @event_interfaces: [INTERN] event chrdevs associated with interrupt lines + * @ring: [DRIVER] any ring buffer present + * @mlock: [INTERN] lock used to prevent simultaneous device state + * changes + * @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 + * @trig: [INTERN] current device trigger (ring buffer modes) + * @pollfunc: [DRIVER] function run on trigger being recieved + **/ +struct iio_dev { + int id; + void *dev_data; + int modes; + int currentmode; + struct device dev; + const struct attribute_group *attrs; + struct module *driver_module; + + int num_interrupt_lines; + struct iio_interrupt **interrupts; + struct attribute_group *event_attrs; + struct attribute_group *event_conf_attrs; + + struct iio_event_interface *event_interfaces; + + struct iio_ring_buffer *ring; + struct mutex mlock; + + struct attribute_group *scan_el_attrs; + int scan_count; + + u16 scan_mask; + bool scan_timestamp; + struct iio_trigger *trig; + struct iio_poll_func *pollfunc; +}; + +/* + * 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 15 + +static inline int iio_scan_mask_query(struct iio_dev *dev_info, int bit) +{ + if (bit > IIO_MAX_SCAN_LENGTH) + return -EINVAL; + else + return !!(dev_info->scan_mask & (1 << bit)); +}; + +static inline int iio_scan_mask_set(struct iio_dev *dev_info, int bit) +{ + if (bit > IIO_MAX_SCAN_LENGTH) + return -EINVAL; + dev_info->scan_mask |= (1 << bit); + dev_info->scan_count++; + return 0; +}; + +static inline int iio_scan_mask_clear(struct iio_dev *dev_info, int bit) +{ + if (bit > IIO_MAX_SCAN_LENGTH) + return -EINVAL; + dev_info->scan_mask &= ~(1 << bit); + dev_info->scan_count--; + return 0; +}; + +/** + * iio_scan_mask_count_to_right() - how many scan elements occur before here + * @dev_info: the iio_device whose scan mode we are querying + * @bit: which number scan element is this + **/ +static inline int iio_scan_mask_count_to_right(struct iio_dev *dev_info, +int bit) +{ + int count = 0; + int mask = (1 << bit); + if (bit > IIO_MAX_SCAN_LENGTH) + return -EINVAL; + while (mask) { + mask >>= 1; + if (mask & dev_info->scan_mask) + count++; + } + + return count; +} + +/** + * iio_device_register() - register a device with the IIO subsystem + * @dev_info: Device structure filled by the device driver + **/ +int iio_device_register(struct iio_dev *dev_info); + +/** + * iio_device_unregister() - unregister a device from the IIO subsystem + * @dev_info: Device structure representing the device. + **/ +void iio_device_unregister(struct iio_dev *dev_info); + +/** + * struct iio_interrupt - wrapper used to allow easy handling of multiple + * physical interrupt lines + * @dev_info: the iio device for which the is an interrupt line + * @line_number: associated line number + * @id: idr allocated unique id number + * @irq: associate interrupt number + * @ev_list: event handler list for associated events + * @ev_list_lock: ensure only one access to list at a time + **/ +struct iio_interrupt { + struct iio_dev *dev_info; + int line_number; + int id; + int irq; + struct list_head ev_list; + spinlock_t ev_list_lock; +}; + +#define to_iio_interrupt(i) container_of(i, struct iio_interrupt, ev_list) + +/** + * iio_register_interrupt_line() - Tell IIO about interrupt lines + * + * @irq: Typically provided via platform data + * @dev_info: IIO device info structure for device + * @line_number: Which interrupt line of the device is this? + * @type: Interrupt type (e.g. edge triggered etc) + * @name: Identifying name. + **/ +int iio_register_interrupt_line(unsigned int irq, + struct iio_dev *dev_info, + int line_number, + unsigned long type, + const char *name); + +void iio_unregister_interrupt_line(struct iio_dev *dev_info, + int line_number); + + + +/** + * iio_push_event() - try to add event to the list for userspace reading + * @dev_info: IIO device structure + * @ev_line: Which event line (hardware interrupt) + * @ev_code: What event + * @timestamp: When the event occured + **/ +int iio_push_event(struct iio_dev *dev_info, + int ev_line, + int ev_code, + s64 timestamp); + +/** + * struct iio_work_cont - container for when singleton handler case matters + * @ws: [DEVICE]work_struct when not only possible event + * @ws_nocheck: [DEVICE]work_struct when only possible event + * @address: [DEVICE]associated register address + * @mask: [DEVICE]associated mask for identifying event source + * @st: [DEVICE]device specific state information + **/ +struct iio_work_cont { + struct work_struct ws; + struct work_struct ws_nocheck; + int address; + int mask; + void *st; +}; + +#define to_iio_work_cont_check(_ws) \ + container_of(_ws, struct iio_work_cont, ws) + +#define to_iio_work_cont_no_check(_ws) \ + container_of(_ws, struct iio_work_cont, ws_nocheck) + +/** + * iio_init_work_cont() - intiialize the elements of a work container + * @cont: the work container + * @_checkfunc: function called when there are multiple possible int sources + * @_nocheckfunc: function for when there is only one int source + * @_add: driver dependant, typically a register address + * @_mask: driver dependant, typically a bit mask for a register + * @_st: driver dependant, typically pointer to a device state structure + **/ +static inline void +iio_init_work_cont(struct iio_work_cont *cont, + void (*_checkfunc)(struct work_struct *), + void (*_nocheckfunc)(struct work_struct *), + int _add, int _mask, void *_st) +{ + INIT_WORK(&(cont)->ws, _checkfunc); + INIT_WORK(&(cont)->ws_nocheck, _nocheckfunc); + cont->address = _add; + cont->mask = _mask; + cont->st = _st; +} +/** + * __iio_push_event() tries to add an event to the list associated with a chrdev + * @ev_int: the event interface to which we are pushing the event + * @ev_code: the outgoing event code + * @timestamp: timestamp of the event + * @shared_pointer_p: the shared event pointer + **/ +int __iio_push_event(struct iio_event_interface *ev_int, + int ev_code, + s64 timestamp, + struct iio_shared_ev_pointer* + shared_pointer_p); +/** + * __iio_change_event() change an event code in case of event escallation + * @ev: the evnet to be changed + * @ev_code: new event code + * @timestamp: new timestamp + **/ +void __iio_change_event(struct iio_detected_event_list *ev, + int ev_code, + s64 timestamp); + +/** + * iio_setup_ev_int() Configure an event interface (chrdev) + * @name: name used for resulting sysfs directory etc. + * @ev_int: interface we are configuring + * @owner: module that is responsible for registering this ev_int + * @dev: device whose ev_int this is + **/ +int iio_setup_ev_int(struct iio_event_interface *ev_int, + const char *name, + struct module *owner, + struct device *dev); + +void iio_free_ev_int(struct iio_event_interface *ev_int); + +/** + * iio_allocate_chrdev() - Allocate a chrdev + * @handler: struct that contains relevant file handling for chrdev + * @dev_info: iio_dev for which chrdev is being created + **/ +int iio_allocate_chrdev(struct iio_handler *handler, struct iio_dev *dev_info); +void iio_deallocate_chrdev(struct iio_handler *handler); + +/* Used to distinguish between bipolar and unipolar scan elemenents. + * Whilst this may seem obvious, we may well want to change the representation + * in the future!*/ +#define IIO_SIGNED(a) -(a) +#define IIO_UNSIGNED(a) (a) + +extern dev_t iio_devt; +extern struct class iio_class; + +/** + * iio_put_device() - reference counted deallocated of struct device + * @dev: the iio_device containing the device + **/ +static inline void iio_put_device(struct iio_dev *dev) +{ + if (dev) + put_device(&dev->dev); +}; + +/** + * to_iio_dev() - get iio_dev for which we have have the struct device + * @d: the struct device + **/ +static inline struct iio_dev *to_iio_dev(struct device *d) +{ + return container_of(d, struct iio_dev, dev); +}; + +/** + * iio_dev_get_devdata() - helper function gets device specific data + * @d: the iio_dev associated with the device + **/ +static inline void *iio_dev_get_devdata(struct iio_dev *d) +{ + return d->dev_data; +} + +/** + * iio_allocate_device() - allocate an iio_dev from a driver + **/ +struct iio_dev *iio_allocate_device(void); + +/** + * iio_free_device() - free an iio_dev from a driver + **/ +void iio_free_device(struct iio_dev *dev); + +/** + * iio_put() - internal module reference count reduce + **/ +void iio_put(void); + +/** + * iio_get() - internal module reference count increase + **/ +void iio_get(void); + +/* Ring buffer related */ +int iio_device_get_chrdev_minor(void); +void iio_device_free_chrdev_minor(int val); + +/** + * iio_ring_enabled() helper function to test if any form of ring enabled + **/ +static inline bool iio_ring_enabled(struct iio_dev *dev_info) +{ + return dev_info->currentmode + & (INDIO_RING_TRIGGERED + | INDIO_RING_HARDWARE_BUFFER); +}; + +struct idr; + +int iio_get_new_idr_val(struct idr *this_idr); +void iio_free_idr_val(struct idr *this_idr, int id); +#endif /* _INDUSTRIAL_IO_H_ */ diff --git a/drivers/staging/iio/industrialio-core.c b/drivers/staging/iio/industrialio-core.c new file mode 100644 index 000000000000..660a9c1a1f3f --- /dev/null +++ b/drivers/staging/iio/industrialio-core.c @@ -0,0 +1,851 @@ +/* The industrial I/O core + * + * Copyright (c) 2008 Jonathan Cameron + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * Based on elements of hwmon and input subsystems. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "iio.h" +#include "trigger_consumer.h" + +#define IIO_ID_PREFIX "device" +#define IIO_ID_FORMAT IIO_ID_PREFIX "%d" + +/* IDR to assign each registered device a unique id*/ +static DEFINE_IDR(iio_idr); + +/* IDR for general event identifiers */ +static DEFINE_IDR(iio_event_idr); +/* IDR to allocate character device minor numbers */ +static DEFINE_IDR(iio_chrdev_idr); +/* Lock used to protect both of the above */ +static DEFINE_SPINLOCK(iio_idr_lock); + +dev_t iio_devt; +EXPORT_SYMBOL(iio_devt); + +#define IIO_DEV_MAX 256 +static char *iio_nodename(struct device *dev) +{ + return kasprintf(GFP_KERNEL, "iio/%s", dev_name(dev)); +} + +struct class iio_class = { + .name = "iio", + .nodename = iio_nodename, +}; +EXPORT_SYMBOL(iio_class); + +void __iio_change_event(struct iio_detected_event_list *ev, + int ev_code, + s64 timestamp) +{ + ev->ev.id = ev_code; + ev->ev.timestamp = timestamp; +} +EXPORT_SYMBOL(__iio_change_event); + +/* Used both in the interrupt line put events and the ring buffer ones */ + +/* Note that in it's current form someone has to be listening before events + * are queued. Hence a client MUST open the chrdev before the ring buffer is + * switched on. + */ + int __iio_push_event(struct iio_event_interface *ev_int, + int ev_code, + s64 timestamp, + struct iio_shared_ev_pointer * + shared_pointer_p) +{ + struct iio_detected_event_list *ev; + int ret = 0; + + /* Does anyone care? */ + mutex_lock(&ev_int->event_list_lock); + if (test_bit(IIO_BUSY_BIT_POS, &ev_int->handler.flags)) { + if (ev_int->current_events == ev_int->max_events) + return 0; + ev = kmalloc(sizeof(*ev), GFP_KERNEL); + if (ev == NULL) { + ret = -ENOMEM; + goto error_ret; + } + ev->ev.id = ev_code; + ev->ev.timestamp = timestamp; + ev->shared_pointer = shared_pointer_p; + if (ev->shared_pointer) + shared_pointer_p->ev_p = ev; + + list_add_tail(&ev->list, &ev_int->det_events.list); + ev_int->current_events++; + mutex_unlock(&ev_int->event_list_lock); + wake_up_interruptible(&ev_int->wait); + } else + mutex_unlock(&ev_int->event_list_lock); + +error_ret: + return ret; +} +EXPORT_SYMBOL(__iio_push_event); + +int iio_push_event(struct iio_dev *dev_info, + int ev_line, + int ev_code, + s64 timestamp) +{ + return __iio_push_event(&dev_info->event_interfaces[ev_line], + ev_code, timestamp, NULL); +} +EXPORT_SYMBOL(iio_push_event); + +/* Generic interrupt line interrupt handler */ +irqreturn_t iio_interrupt_handler(int irq, void *_int_info) +{ + struct iio_interrupt *int_info = _int_info; + struct iio_dev *dev_info = int_info->dev_info; + struct iio_event_handler_list *p; + s64 time_ns; + unsigned long flags; + + spin_lock_irqsave(&int_info->ev_list_lock, flags); + if (list_empty(&int_info->ev_list)) { + spin_unlock_irqrestore(&int_info->ev_list_lock, flags); + return IRQ_NONE; + } + + time_ns = iio_get_time_ns(); + /* detect single element list*/ + if (list_is_singular(&int_info->ev_list)) { + disable_irq_nosync(irq); + p = list_first_entry(&int_info->ev_list, + struct iio_event_handler_list, + list); + /* single event handler - maybe shared */ + p->handler(dev_info, 1, time_ns, !(p->refcount > 1)); + } else + list_for_each_entry(p, &int_info->ev_list, list) { + disable_irq_nosync(irq); + p->handler(dev_info, 1, time_ns, 0); + } + spin_unlock_irqrestore(&int_info->ev_list_lock, flags); + + return IRQ_HANDLED; +} + +static struct iio_interrupt *iio_allocate_interrupt(void) +{ + struct iio_interrupt *i = kmalloc(sizeof *i, GFP_KERNEL); + if (i) { + spin_lock_init(&i->ev_list_lock); + INIT_LIST_HEAD(&i->ev_list); + } + return i; +} + +/* Confirming the validity of supplied irq is left to drivers.*/ +int iio_register_interrupt_line(unsigned int irq, + struct iio_dev *dev_info, + int line_number, + unsigned long type, + const char *name) +{ + int ret; + + dev_info->interrupts[line_number] = iio_allocate_interrupt(); + if (dev_info->interrupts[line_number] == NULL) { + ret = -ENOMEM; + goto error_ret; + } + dev_info->interrupts[line_number]->line_number = line_number; + dev_info->interrupts[line_number]->irq = irq; + dev_info->interrupts[line_number]->dev_info = dev_info; + + /* Possibly only request on demand? + * Can see this may complicate the handling of interrupts. + * However, with this approach we might end up handling lots of + * events no-one cares about.*/ + ret = request_irq(irq, + &iio_interrupt_handler, + type, + name, + dev_info->interrupts[line_number]); + +error_ret: + return ret; +} +EXPORT_SYMBOL(iio_register_interrupt_line); + +/* This turns up an awful lot */ +ssize_t iio_read_const_attr(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "%s\n", to_iio_const_attr(attr)->string); +} +EXPORT_SYMBOL(iio_read_const_attr); + +/* Before this runs the interrupt generator must have been disabled */ +void iio_unregister_interrupt_line(struct iio_dev *dev_info, int line_number) +{ + /* make sure the interrupt handlers are all done */ + flush_scheduled_work(); + free_irq(dev_info->interrupts[line_number]->irq, + dev_info->interrupts[line_number]); + kfree(dev_info->interrupts[line_number]); +} +EXPORT_SYMBOL(iio_unregister_interrupt_line); + +/* Reference counted add and remove */ +void iio_add_event_to_list(struct iio_event_handler_list *el, + struct list_head *head) +{ + unsigned long flags; + struct iio_interrupt *inter = to_iio_interrupt(head); + + /* take mutex to protect this element */ + mutex_lock(&el->exist_lock); + if (el->refcount == 0) { + /* Take the event list spin lock */ + spin_lock_irqsave(&inter->ev_list_lock, flags); + list_add(&el->list, head); + spin_unlock_irqrestore(&inter->ev_list_lock, flags); + } + el->refcount++; + mutex_unlock(&el->exist_lock); +} +EXPORT_SYMBOL(iio_add_event_to_list); + +void iio_remove_event_from_list(struct iio_event_handler_list *el, + struct list_head *head) +{ + unsigned long flags; + struct iio_interrupt *inter = to_iio_interrupt(head); + + mutex_lock(&el->exist_lock); + el->refcount--; + if (el->refcount == 0) { + /* Take the event list spin lock */ + spin_lock_irqsave(&inter->ev_list_lock, flags); + list_del_init(&el->list); + spin_unlock_irqrestore(&inter->ev_list_lock, flags); + } + mutex_unlock(&el->exist_lock); +} +EXPORT_SYMBOL(iio_remove_event_from_list); + +ssize_t iio_event_chrdev_read(struct file *filep, + char *buf, + size_t count, + loff_t *f_ps) +{ + struct iio_event_interface *ev_int = filep->private_data; + struct iio_detected_event_list *el; + int ret; + size_t len; + + mutex_lock(&ev_int->event_list_lock); + if (list_empty(&ev_int->det_events.list)) { + if (filep->f_flags & O_NONBLOCK) { + ret = -EAGAIN; + goto error_mutex_unlock; + } + mutex_unlock(&ev_int->event_list_lock); + /* Blocking on device; waiting for something to be there */ + ret = wait_event_interruptible(ev_int->wait, + !list_empty(&ev_int + ->det_events.list)); + if (ret) + goto error_ret; + /* Single access device so noone else can get the data */ + mutex_lock(&ev_int->event_list_lock); + } + + el = list_first_entry(&ev_int->det_events.list, + struct iio_detected_event_list, + list); + len = sizeof el->ev; + if (copy_to_user(buf, &(el->ev), len)) { + ret = -EFAULT; + goto error_mutex_unlock; + } + list_del(&el->list); + ev_int->current_events--; + mutex_unlock(&ev_int->event_list_lock); + /* + * Possible concurency issue if an update of this event is on its way + * through. May lead to new even being removed whilst the reported event + * was the unescalated event. In typical use case this is not a problem + * as userspace will say read half the buffer due to a 50% full event + * which would make the correct 100% full incorrect anyway. + */ + spin_lock(&el->shared_pointer->lock); + if (el->shared_pointer) + (el->shared_pointer->ev_p) = NULL; + spin_unlock(&el->shared_pointer->lock); + + kfree(el); + + return len; + +error_mutex_unlock: + mutex_unlock(&ev_int->event_list_lock); +error_ret: + + return ret; +} + +int iio_event_chrdev_release(struct inode *inode, struct file *filep) +{ + struct iio_handler *hand = iio_cdev_to_handler(inode->i_cdev); + struct iio_event_interface *ev_int = hand->private; + struct iio_detected_event_list *el, *t; + + mutex_lock(&ev_int->event_list_lock); + clear_bit(IIO_BUSY_BIT_POS, &ev_int->handler.flags); + /* + * In order to maintain a clean state for reopening, + * clear out any awaiting events. The mask will prevent + * any new __iio_push_event calls running. + */ + list_for_each_entry_safe(el, t, &ev_int->det_events.list, list) { + list_del(&el->list); + kfree(el); + } + mutex_unlock(&ev_int->event_list_lock); + + return 0; +} + +int iio_event_chrdev_open(struct inode *inode, struct file *filep) +{ + struct iio_handler *hand = iio_cdev_to_handler(inode->i_cdev); + struct iio_event_interface *ev_int = hand->private; + + mutex_lock(&ev_int->event_list_lock); + if (test_and_set_bit(IIO_BUSY_BIT_POS, &hand->flags)) { + fops_put(filep->f_op); + mutex_unlock(&ev_int->event_list_lock); + return -EBUSY; + } + filep->private_data = hand->private; + mutex_unlock(&ev_int->event_list_lock); + + return 0; +} + +static const struct file_operations iio_event_chrdev_fileops = { + .read = iio_event_chrdev_read, + .release = iio_event_chrdev_release, + .open = iio_event_chrdev_open, + .owner = THIS_MODULE, +}; + +static void iio_event_dev_release(struct device *dev) +{ + struct iio_event_interface *ev_int + = container_of(dev, struct iio_event_interface, dev); + cdev_del(&ev_int->handler.chrdev); + iio_device_free_chrdev_minor(MINOR(dev->devt)); +}; + +static struct device_type iio_event_type = { + .release = iio_event_dev_release, +}; + +int iio_device_get_chrdev_minor(void) +{ + int ret, val; + +idr_again: + if (unlikely(idr_pre_get(&iio_chrdev_idr, GFP_KERNEL) == 0)) + return -ENOMEM; + spin_lock(&iio_idr_lock); + ret = idr_get_new(&iio_chrdev_idr, NULL, &val); + spin_unlock(&iio_idr_lock); + if (unlikely(ret == -EAGAIN)) + goto idr_again; + else if (unlikely(ret)) + return ret; + if (val > IIO_DEV_MAX) + return -ENOMEM; + return val; +} + +void iio_device_free_chrdev_minor(int val) +{ + spin_lock(&iio_idr_lock); + idr_remove(&iio_chrdev_idr, val); + spin_unlock(&iio_idr_lock); +} + +int iio_setup_ev_int(struct iio_event_interface *ev_int, + const char *name, + struct module *owner, + struct device *dev) +{ + int ret, minor; + + ev_int->dev.class = &iio_class; + ev_int->dev.parent = dev; + ev_int->dev.type = &iio_event_type; + device_initialize(&ev_int->dev); + + minor = iio_device_get_chrdev_minor(); + if (minor < 0) { + ret = minor; + goto error_device_put; + } + ev_int->dev.devt = MKDEV(MAJOR(iio_devt), minor); + dev_set_name(&ev_int->dev, "%s", name); + + ret = device_add(&ev_int->dev); + if (ret) + goto error_free_minor; + + cdev_init(&ev_int->handler.chrdev, &iio_event_chrdev_fileops); + ev_int->handler.chrdev.owner = owner; + + mutex_init(&ev_int->event_list_lock); + /* discussion point - make this variable? */ + ev_int->max_events = 10; + ev_int->current_events = 0; + INIT_LIST_HEAD(&ev_int->det_events.list); + init_waitqueue_head(&ev_int->wait); + ev_int->handler.private = ev_int; + ev_int->handler.flags = 0; + + ret = cdev_add(&ev_int->handler.chrdev, ev_int->dev.devt, 1); + if (ret) + goto error_unreg_device; + + return 0; + +error_unreg_device: + device_unregister(&ev_int->dev); +error_free_minor: + iio_device_free_chrdev_minor(minor); +error_device_put: + put_device(&ev_int->dev); + + return ret; +} + +void iio_free_ev_int(struct iio_event_interface *ev_int) +{ + device_unregister(&ev_int->dev); + put_device(&ev_int->dev); +} + +static int __init iio_dev_init(void) +{ + int err; + + err = alloc_chrdev_region(&iio_devt, 0, IIO_DEV_MAX, "iio"); + if (err < 0) + printk(KERN_ERR "%s: failed to allocate char dev region\n", + __FILE__); + + return err; +} + +static void __exit iio_dev_exit(void) +{ + if (iio_devt) + unregister_chrdev_region(iio_devt, IIO_DEV_MAX); +} + +static int __init iio_init(void) +{ + int ret; + + /* Create sysfs class */ + ret = class_register(&iio_class); + if (ret < 0) { + printk(KERN_ERR + "%s could not create sysfs class\n", + __FILE__); + goto error_nothing; + } + + ret = iio_dev_init(); + if (ret < 0) + goto error_unregister_class; + + return 0; + +error_unregister_class: + class_unregister(&iio_class); +error_nothing: + return ret; +} + +static void __exit iio_exit(void) +{ + iio_dev_exit(); + class_unregister(&iio_class); +} + +static int iio_device_register_sysfs(struct iio_dev *dev_info) +{ + int ret = 0; + + ret = sysfs_create_group(&dev_info->dev.kobj, dev_info->attrs); + if (ret) { + dev_err(dev_info->dev.parent, + "Failed to register sysfs hooks\n"); + goto error_ret; + } + + if (dev_info->scan_el_attrs) { + ret = sysfs_create_group(&dev_info->dev.kobj, + dev_info->scan_el_attrs); + if (ret) + dev_err(&dev_info->dev, + "Failed to add sysfs scan els\n"); + } + +error_ret: + return ret; +} + +static void iio_device_unregister_sysfs(struct iio_dev *dev_info) +{ + if (dev_info->scan_el_attrs) + sysfs_remove_group(&dev_info->dev.kobj, + dev_info->scan_el_attrs); + + sysfs_remove_group(&dev_info->dev.kobj, dev_info->attrs); +} + +int iio_get_new_idr_val(struct idr *this_idr) +{ + int ret; + int val; + +idr_again: + if (unlikely(idr_pre_get(this_idr, GFP_KERNEL) == 0)) + return -ENOMEM; + + spin_lock(&iio_idr_lock); + ret = idr_get_new(this_idr, NULL, &val); + spin_unlock(&iio_idr_lock); + if (unlikely(ret == -EAGAIN)) + goto idr_again; + else if (unlikely(ret)) + return ret; + + return val; +} +EXPORT_SYMBOL(iio_get_new_idr_val); + +void iio_free_idr_val(struct idr *this_idr, int id) +{ + spin_lock(&iio_idr_lock); + idr_remove(this_idr, id); + spin_unlock(&iio_idr_lock); +} +EXPORT_SYMBOL(iio_free_idr_val); + +static int iio_device_register_id(struct iio_dev *dev_info, + struct idr *this_idr) +{ + + dev_info->id = iio_get_new_idr_val(&iio_idr); + if (dev_info->id < 0) + return dev_info->id; + return 0; +} + +static void iio_device_unregister_id(struct iio_dev *dev_info) +{ + iio_free_idr_val(&iio_idr, dev_info->id); +} + +static inline int __iio_add_event_config_attrs(struct iio_dev *dev_info, int i) +{ + int ret; + /*p for adding, q for removing */ + struct attribute **attrp, **attrq; + + if (dev_info->event_conf_attrs && dev_info->event_conf_attrs[i].attrs) { + attrp = dev_info->event_conf_attrs[i].attrs; + while (*attrp) { + ret = sysfs_add_file_to_group(&dev_info->dev.kobj, + *attrp, + dev_info + ->event_attrs[i].name); + if (ret) + goto error_ret; + attrp++; + } + } + return 0; + +error_ret: + attrq = dev_info->event_conf_attrs[i].attrs; + while (attrq != attrp) { + sysfs_remove_file_from_group(&dev_info->dev.kobj, + *attrq, + dev_info->event_attrs[i].name); + attrq++; + } + + return ret; +} + +static inline int __iio_remove_event_config_attrs(struct iio_dev *dev_info, + int i) +{ + struct attribute **attrq; + + if (dev_info->event_conf_attrs + && dev_info->event_conf_attrs[i].attrs) { + attrq = dev_info->event_conf_attrs[i].attrs; + while (*attrq) { + sysfs_remove_file_from_group(&dev_info->dev.kobj, + *attrq, + dev_info + ->event_attrs[i].name); + attrq++; + } + } + + return 0; +} + +static int iio_device_register_eventset(struct iio_dev *dev_info) +{ + int ret = 0, i, j; + + if (dev_info->num_interrupt_lines == 0) + return 0; + + dev_info->event_interfaces = + kzalloc(sizeof(struct iio_event_interface) + *dev_info->num_interrupt_lines, + GFP_KERNEL); + if (dev_info->event_interfaces == NULL) { + ret = -ENOMEM; + goto error_ret; + } + + dev_info->interrupts = kzalloc(sizeof(struct iio_interrupt *) + *dev_info->num_interrupt_lines, + GFP_KERNEL); + if (dev_info->interrupts == NULL) { + ret = -ENOMEM; + goto error_free_event_interfaces; + } + + for (i = 0; i < dev_info->num_interrupt_lines; i++) { + dev_info->event_interfaces[i].owner = dev_info->driver_module; + ret = iio_get_new_idr_val(&iio_event_idr); + if (ret) + goto error_free_setup_ev_ints; + else + dev_info->event_interfaces[i].id = ret; + + snprintf(dev_info->event_interfaces[i]._name, 20, + "event_line%d", + dev_info->event_interfaces[i].id); + + ret = iio_setup_ev_int(&dev_info->event_interfaces[i], + (const char *)(dev_info + ->event_interfaces[i] + ._name), + dev_info->driver_module, + &dev_info->dev); + if (ret) { + dev_err(&dev_info->dev, + "Could not get chrdev interface\n"); + iio_free_idr_val(&iio_event_idr, + dev_info->event_interfaces[i].id); + goto error_free_setup_ev_ints; + } + } + + for (i = 0; i < dev_info->num_interrupt_lines; i++) { + snprintf(dev_info->event_interfaces[i]._attrname, 20, + "event_line%d_sources", i); + dev_info->event_attrs[i].name + = (const char *) + (dev_info->event_interfaces[i]._attrname); + ret = sysfs_create_group(&dev_info->dev.kobj, + &dev_info->event_attrs[i]); + if (ret) { + dev_err(&dev_info->dev, + "Failed to register sysfs for event attrs"); + goto error_remove_sysfs_interfaces; + } + } + + for (i = 0; i < dev_info->num_interrupt_lines; i++) { + ret = __iio_add_event_config_attrs(dev_info, i); + if (ret) + goto error_unregister_config_attrs; + } + + return 0; + +error_unregister_config_attrs: + for (j = 0; j < i; j++) + __iio_remove_event_config_attrs(dev_info, i); + i = dev_info->num_interrupt_lines - 1; +error_remove_sysfs_interfaces: + for (j = 0; j < i; j++) + sysfs_remove_group(&dev_info->dev.kobj, + &dev_info->event_attrs[j]); + i = dev_info->num_interrupt_lines - 1; +error_free_setup_ev_ints: + for (j = 0; j < i; j++) { + iio_free_idr_val(&iio_event_idr, + dev_info->event_interfaces[i].id); + iio_free_ev_int(&dev_info->event_interfaces[j]); + } + kfree(dev_info->interrupts); +error_free_event_interfaces: + kfree(dev_info->event_interfaces); +error_ret: + + return ret; +} + +static void iio_device_unregister_eventset(struct iio_dev *dev_info) +{ + int i; + + if (dev_info->num_interrupt_lines == 0) + return; + for (i = 0; i < dev_info->num_interrupt_lines; i++) + sysfs_remove_group(&dev_info->dev.kobj, + &dev_info->event_attrs[i]); + + for (i = 0; i < dev_info->num_interrupt_lines; i++) { + iio_free_idr_val(&iio_event_idr, + dev_info->event_interfaces[i].id); + iio_free_ev_int(&dev_info->event_interfaces[i]); + } + kfree(dev_info->interrupts); + kfree(dev_info->event_interfaces); +} + +static void iio_dev_release(struct device *device) +{ + struct iio_dev *dev = to_iio_dev(device); + + iio_put(); + kfree(dev); +} + +static struct device_type iio_dev_type = { + .name = "iio_device", + .release = iio_dev_release, +}; + +struct iio_dev *iio_allocate_device(void) +{ + struct iio_dev *dev = kzalloc(sizeof *dev, GFP_KERNEL); + + if (dev) { + dev->dev.type = &iio_dev_type; + dev->dev.class = &iio_class; + device_initialize(&dev->dev); + dev_set_drvdata(&dev->dev, (void *)dev); + mutex_init(&dev->mlock); + iio_get(); + } + + return dev; +} +EXPORT_SYMBOL(iio_allocate_device); + +void iio_free_device(struct iio_dev *dev) +{ + if (dev) + iio_put_device(dev); +} +EXPORT_SYMBOL(iio_free_device); + +int iio_device_register(struct iio_dev *dev_info) +{ + int ret; + + ret = iio_device_register_id(dev_info, &iio_idr); + if (ret) { + dev_err(&dev_info->dev, "Failed to get id\n"); + goto error_ret; + } + dev_set_name(&dev_info->dev, "device%d", dev_info->id); + + ret = device_add(&dev_info->dev); + if (ret) + goto error_free_idr; + ret = iio_device_register_sysfs(dev_info); + if (ret) { + dev_err(dev_info->dev.parent, + "Failed to register sysfs interfaces\n"); + goto error_del_device; + } + ret = iio_device_register_eventset(dev_info); + if (ret) { + dev_err(dev_info->dev.parent, + "Failed to register event set \n"); + goto error_free_sysfs; + } + if (dev_info->modes & INDIO_RING_TRIGGERED) + iio_device_register_trigger_consumer(dev_info); + + return 0; + +error_free_sysfs: + iio_device_unregister_sysfs(dev_info); +error_del_device: + device_del(&dev_info->dev); +error_free_idr: + iio_device_unregister_id(dev_info); +error_ret: + return ret; +} +EXPORT_SYMBOL(iio_device_register); + +void iio_device_unregister(struct iio_dev *dev_info) +{ + if (dev_info->modes & INDIO_RING_TRIGGERED) + iio_device_unregister_trigger_consumer(dev_info); + iio_device_unregister_eventset(dev_info); + iio_device_unregister_sysfs(dev_info); + iio_device_unregister_id(dev_info); + device_unregister(&dev_info->dev); +} +EXPORT_SYMBOL(iio_device_unregister); + +void iio_put(void) +{ + module_put(THIS_MODULE); +} + +void iio_get(void) +{ + __module_get(THIS_MODULE); +} + +subsys_initcall(iio_init); +module_exit(iio_exit); + +MODULE_AUTHOR("Jonathan Cameron "); +MODULE_DESCRIPTION("Industrial I/O core"); +MODULE_LICENSE("GPL"); diff --git a/drivers/staging/iio/sysfs.h b/drivers/staging/iio/sysfs.h new file mode 100644 index 000000000000..bfe4055c0ed2 --- /dev/null +++ b/drivers/staging/iio/sysfs.h @@ -0,0 +1,293 @@ +/* The industrial I/O core + * + *Copyright (c) 2008 Jonathan Cameron + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * General attributes + */ + +#ifndef _INDUSTRIAL_IO_SYSFS_H_ +#define _INDUSTRIAL_IO_SYSFS_H_ + +#include "iio.h" + +/** + * struct iio_event_attribute - event control attribute + * @dev_attr: underlying device attribute + * @mask: mask for the event when detecting + * @listel: list header to allow addition to list of event handlers +*/ +struct iio_event_attr { + struct device_attribute dev_attr; + int mask; + struct iio_event_handler_list *listel; +}; + +#define to_iio_event_attr(_dev_attr) \ + container_of(_dev_attr, struct iio_event_attr, dev_attr) + +/** + * struct iio_chrdev_minor_attr - simple attribute to allow reading of chrdev + * minor number + * @dev_attr: underlying device attribute + * @minor: the minor number + */ +struct iio_chrdev_minor_attr { + struct device_attribute dev_attr; + int minor; +}; + +void +__init_iio_chrdev_minor_attr(struct iio_chrdev_minor_attr *minor_attr, + const char *name, + struct module *owner, + int id); + + +#define to_iio_chrdev_minor_attr(_dev_attr) \ + container_of(_dev_attr, struct iio_chrdev_minor_attr, dev_attr); + +/** + * struct iio_dev_attr - iio specific device attribute + * @dev_attr: underlying device attribute + * @address: associated register address + */ +struct iio_dev_attr { + struct device_attribute dev_attr; + int address; + int val2; +}; + +#define to_iio_dev_attr(_dev_attr) \ + container_of(_dev_attr, struct iio_dev_attr, dev_attr) + +ssize_t iio_read_const_attr(struct device *dev, + struct device_attribute *attr, + char *len); + +/** + * struct iio_const_attr - constant device specific attribute + * often used for things like available modes + */ +struct iio_const_attr { + const char *string; + struct device_attribute dev_attr; +}; + +#define to_iio_const_attr(_dev_attr) \ + container_of(_dev_attr, struct iio_const_attr, dev_attr) + +/* Some attributes will be hard coded (device dependant) and not require an + address, in these cases pass a negative */ +#define IIO_ATTR(_name, _mode, _show, _store, _addr) \ + { .dev_attr = __ATTR(_name, _mode, _show, _store), \ + .address = _addr } + +#define IIO_ATTR_2(_name, _mode, _show, _store, _addr, _val2) \ + { .dev_attr = __ATTR(_name, _mode, _show, _store), \ + .address = _addr, \ + .val2 = _val2 } + +#define IIO_DEVICE_ATTR(_name, _mode, _show, _store, _addr) \ + struct iio_dev_attr iio_dev_attr_##_name \ + = IIO_ATTR(_name, _mode, _show, _store, _addr) + + +#define IIO_DEVICE_ATTR_2(_name, _mode, _show, _store, _addr, _val2) \ + struct iio_dev_attr iio_dev_attr_##_name \ + = IIO_ATTR_2(_name, _mode, _show, _store, _addr, _val2) + +#define IIO_CONST_ATTR(_name, _string) \ + struct iio_const_attr iio_const_attr_##_name \ + = { .string = _string, \ + .dev_attr = __ATTR(_name, S_IRUGO, iio_read_const_attr, NULL)} + +/* Generic attributes of onetype or another */ + +/** + * IIO_DEV_ATTR_REG: revision number for the device + * + * Very much device dependent. + **/ +#define IIO_DEV_ATTR_REV(_show) \ + IIO_DEVICE_ATTR(revision, S_IRUGO, _show, NULL, 0) +/** + * IIO_DEV_ATTR_NAME: chip type dependant identifier + **/ +#define IIO_DEV_ATTR_NAME(_show) \ + IIO_DEVICE_ATTR(name, S_IRUGO, _show, NULL, 0) + +/** + * IIO_DEV_ATTR_SAMP_FREQ: sets any internal clock frequency + **/ +#define IIO_DEV_ATTR_SAMP_FREQ(_mode, _show, _store) \ + IIO_DEVICE_ATTR(sampling_frequency, _mode, _show, _store, 0) + +/** + * IIO_DEV_ATTR_AVAIL_SAMP_FREQ: list available sampling frequencies. + * + * May be mode dependant on some devices + **/ +#define IIO_DEV_ATTR_AVAIL_SAMP_FREQ(_show) \ + IIO_DEVICE_ATTR(available_sampling_frequency, S_IRUGO, _show, NULL, 0) + +/** + * IIO_DEV_ATTR_CONST_AVAIL_SAMP_FREQ: list available sampling frequencies. + * + * Constant version + **/ +#define IIO_CONST_ATTR_AVAIL_SAMP_FREQ(_string) \ + IIO_CONST_ATTR(available_sampling_frequency, _string) +/** + * IIO_DEV_ATTR_SCAN_MODE: select a scan mode + * + * This is used when only certain combinations of inputs may be read in one + * scan. + **/ +#define IIO_DEV_ATTR_SCAN_MODE(_mode, _show, _store) \ + IIO_DEVICE_ATTR(scan_mode, _mode, _show, _store, 0) +/** + * IIO_DEV_ATTR_AVAIL_SCAN_MODES: list available scan modes + **/ +#define IIO_DEV_ATTR_AVAIL_SCAN_MODES(_show) \ + IIO_DEVICE_ATTR(available_scan_modes, S_IRUGO, _show, NULL, 0) + +/** + * IIO_DEV_ATTR_SCAN: result of scan of multiple channels + **/ +#define IIO_DEV_ATTR_SCAN(_show) \ + IIO_DEVICE_ATTR(scan, S_IRUGO, _show, NULL, 0); + +/** + * IIO_DEV_ATTR_INPUT: direct read of a single input channel + **/ +#define IIO_DEV_ATTR_INPUT(_number, _show) \ + IIO_DEVICE_ATTR(in##_number, S_IRUGO, _show, NULL, _number) + + +/** + * IIO_DEV_ATTR_SW_RING_ENABLE: enable software ring buffer + * + * Success may be dependant on attachment of trigger previously + **/ +#define IIO_DEV_ATTR_SW_RING_ENABLE(_show, _store) \ + IIO_DEVICE_ATTR(sw_ring_enable, S_IRUGO | S_IWUSR, _show, _store, 0) + +/** + * IIO_DEV_ATTR_HW_RING_ENABLE: enable hardware ring buffer + * + * This is a different attribute from the software one as one can invision + * schemes where a combination of the two may be used. + **/ +#define IIO_DEV_ATTR_HW_RING_ENABLE(_show, _store) \ + IIO_DEVICE_ATTR(hw_ring_enable, S_IRUGO | S_IWUSR, _show, _store, 0) + +/** + * IIO_DEV_ATTR_BPSE: set number of bits per scan element + **/ +#define IIO_DEV_ATTR_BPSE(_mode, _show, _store) \ + IIO_DEVICE_ATTR(bpse, _mode, _show, _store, 0) + +/** + * IIO_DEV_ATTR_BPSE_AVAILABLE: no of bits per scan element supported + **/ +#define IIO_DEV_ATTR_BPSE_AVAILABLE(_show) \ + IIO_DEVICE_ATTR(bpse_available, S_IRUGO, _show, NULL, 0) + +/** + * IIO_DEV_ATTR_TEMP: many sensors have auxiliary temperature sensors + **/ +#define IIO_DEV_ATTR_TEMP(_show) \ + IIO_DEVICE_ATTR(temp, S_IRUGO, _show, NULL, 0) +/** + * IIO_EVENT_SH: generic shared event handler + * + * This is used in cases where more than one event may result from a single + * handler. Often the case that some alarm register must be read and multiple + * alarms may have been triggered. + **/ +#define IIO_EVENT_SH(_name, _handler) \ + static struct iio_event_handler_list \ + iio_event_##_name = { \ + .handler = _handler, \ + .refcount = 0, \ + .exist_lock = __MUTEX_INITIALIZER(iio_event_##_name \ + .exist_lock), \ + .list = { \ + .next = &iio_event_##_name.list, \ + .prev = &iio_event_##_name.list, \ + }, \ + }; +/** + * IIO_EVENT_ATTR_SH: generic shared event attribute + * + * An attribute with an associated IIO_EVENT_SH + **/ +#define IIO_EVENT_ATTR_SH(_name, _ev_list, _show, _store, _mask) \ + static struct iio_event_attr \ + iio_event_attr_##_name \ + = { .dev_attr = __ATTR(_name, S_IRUGO | S_IWUSR, \ + _show, _store), \ + .mask = _mask, \ + .listel = &_ev_list }; + +/** + * IIO_EVENT_ATTR: non shared event attribute + **/ +#define IIO_EVENT_ATTR(_name, _show, _store, _mask, _handler) \ + static struct iio_event_handler_list \ + iio_event_##_name = { \ + .handler = _handler, \ + }; \ + static struct \ + iio_event_attr \ + iio_event_attr_##_name \ + = { .dev_attr = __ATTR(_name, S_IRUGO | S_IWUSR, \ + _show, _store), \ + .mask = _mask, \ + .listel = &iio_event_##_name }; \ + +/** + * IIO_EVENT_ATTR_DATA_RDY: event driven by data ready signal + * + * Not typically implemented in devices where full triggering support + * has been implemented + **/ +#define IIO_EVENT_ATTR_DATA_RDY(_show, _store, _mask, _handler) \ + IIO_EVENT_ATTR(data_rdy, _show, _store, _mask, _handler) + +#define IIO_EVENT_CODE_DATA_RDY 100 +#define IIO_EVENT_CODE_RING_BASE 200 +#define IIO_EVENT_CODE_ACCEL_BASE 300 +#define IIO_EVENT_CODE_GYRO_BASE 400 +#define IIO_EVENT_CODE_ADC_BASE 500 +#define IIO_EVENT_CODE_MISC_BASE 600 + +#define IIO_EVENT_CODE_DEVICE_SPECIFIC 1000 + +/** + * IIO_EVENT_ATTR_RING_50_FULL: ring buffer event to indicate 50% full + **/ +#define IIO_EVENT_ATTR_RING_50_FULL(_show, _store, _mask, _handler) \ + IIO_EVENT_ATTR(ring_50_full, _show, _store, _mask, _handler) + +/** + * IIO_EVENT_ATTR_RING_50_FULL_SH: shared ring event to indicate 50% full + **/ +#define IIO_EVENT_ATTR_RING_50_FULL_SH(_evlist, _show, _store, _mask) \ + IIO_EVENT_ATTR_SH(ring_50_full, _evlist, _show, _store, _mask) + +/** + * IIO_EVENT_ATTR_RING_75_FULL_SH: shared ring event to indicate 75% full + **/ +#define IIO_EVENT_ATTR_RING_75_FULL_SH(_evlist, _show, _store, _mask) \ + IIO_EVENT_ATTR_SH(ring_75_full, _evlist, _show, _store, _mask) + +#define IIO_EVENT_CODE_RING_50_FULL IIO_EVENT_CODE_RING_BASE +#define IIO_EVENT_CODE_RING_75_FULL (IIO_EVENT_CODE_RING_BASE + 1) +#define IIO_EVENT_CODE_RING_100_FULL (IIO_EVENT_CODE_RING_BASE + 2) + +#endif /* _INDUSTRIAL_IO_SYSFS_H_ */ diff --git a/drivers/staging/iio/trigger_consumer.h b/drivers/staging/iio/trigger_consumer.h new file mode 100644 index 000000000000..a6053892893f --- /dev/null +++ b/drivers/staging/iio/trigger_consumer.h @@ -0,0 +1,26 @@ + +/* The industrial I/O core, trigger consumer handling functions + * + * Copyright (c) 2008 Jonathan Cameron + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ + +/** + * iio_device_register_trigger_consumer() - set up an iio_dev to use triggers. + * @dev_info: iio_dev associated with the device that will consume the trigger + **/ +int iio_device_register_trigger_consumer(struct iio_dev *dev_info) +{ + return 0; +}; +/** + * iio_device_unregister_trigger_consumer() - reverse the registration process +. * @dev_info: iio_dev associated with the device that consumed the trigger + **/ +int iio_device_unregister_trigger_consumer(struct iio_dev *dev_info) +{ + return 0; +}; -- cgit v1.2.3-59-g8ed1b