staging:iio:dummy Add event support + fake event generator
The event generator is not very pretty but does the job and allows this driver to look a lot more like a normal driver than it otherwise would. Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jonathan Cameron
Greg Kroah-Hartman
Родитель
3a84331db2
Коммит
e6477000fc
|
|
@ -70,12 +70,26 @@ source "drivers/staging/iio/meter/Kconfig"
|
|||
source "drivers/staging/iio/resolver/Kconfig"
|
||||
source "drivers/staging/iio/trigger/Kconfig"
|
||||
|
||||
config IIO_DUMMY_EVGEN
|
||||
tristate
|
||||
|
||||
config IIO_SIMPLE_DUMMY
|
||||
tristate "An example driver with no hardware requirements"
|
||||
select IIO_SIMPLE_DUMMY_EVGEN if IIO_SIMPLE_DUMMY_EVENTS
|
||||
help
|
||||
Driver intended mainly as documentation for how to write
|
||||
a driver. May also be useful for testing userspace code
|
||||
without hardward.
|
||||
Driver intended mainly as documentation for how to write
|
||||
a driver. May also be useful for testing userspace code
|
||||
without hardward.
|
||||
|
||||
if IIO_SIMPLE_DUMMY
|
||||
|
||||
config IIO_SIMPLE_DUMMY_EVENTS
|
||||
boolean "Event generation support"
|
||||
select IIO_DUMMY_EVGEN
|
||||
help
|
||||
Add some dummy events to the simple dummy driver.
|
||||
|
||||
|
||||
endif # IIO_SIMPLE_DUMMY
|
||||
|
||||
endif # IIO
|
||||
|
|
|
|||
|
|
@ -10,7 +10,11 @@ industrialio-$(CONFIG_IIO_TRIGGER) += industrialio-trigger.o
|
|||
obj-$(CONFIG_IIO_SW_RING) += ring_sw.o
|
||||
obj-$(CONFIG_IIO_KFIFO_BUF) += kfifo_buf.o
|
||||
|
||||
obj-$(CONFIG_IIO_SIMPLE_DUMMY) += iio_simple_dummy.o
|
||||
obj-$(CONFIG_IIO_SIMPLE_DUMMY) += iio_dummy.o
|
||||
iio_dummy-y := iio_simple_dummy.o
|
||||
iio_dummy-$(CONFIG_IIO_SIMPLE_DUMMY_EVENTS) += iio_simple_dummy_events.o
|
||||
|
||||
obj-$(CONFIG_IIO_DUMMY_EVGEN) += iio_dummy_evgen.o
|
||||
|
||||
obj-y += accel/
|
||||
obj-y += adc/
|
||||
|
|
|
|||
|
|
@ -0,0 +1,217 @@
|
|||
/**
|
||||
* Copyright (c) 2011 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.
|
||||
*
|
||||
* Companion module to the iio simple dummy example driver.
|
||||
* The purpose of this is to generate 'fake' event interrupts thus
|
||||
* allowing that driver's code to be as close as possible to that of
|
||||
* a normal driver talking to hardware. The approach used here
|
||||
* is not intended to be general and just happens to work for this
|
||||
* particular use case.
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/irq.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/sysfs.h>
|
||||
|
||||
#include "iio_dummy_evgen.h"
|
||||
#include "iio.h"
|
||||
#include "sysfs.h"
|
||||
|
||||
/* Fiddly bit of faking and irq without hardware */
|
||||
#define IIO_EVENTGEN_NO 10
|
||||
/**
|
||||
* struct iio_dummy_evgen - evgen state
|
||||
* @chip: irq chip we are faking
|
||||
* @base: base of irq range
|
||||
* @enabled: mask of which irqs are enabled
|
||||
* @inuse: mask of which irqs actually have anyone connected
|
||||
* @lock: protect the evgen state
|
||||
*/
|
||||
struct iio_dummy_eventgen {
|
||||
struct irq_chip chip;
|
||||
int base;
|
||||
bool enabled[IIO_EVENTGEN_NO];
|
||||
bool inuse[IIO_EVENTGEN_NO];
|
||||
struct mutex lock;
|
||||
};
|
||||
|
||||
/* We can only ever have one instance of this 'device' */
|
||||
static struct iio_dummy_eventgen *iio_evgen;
|
||||
static const char *iio_evgen_name = "iio_dummy_evgen";
|
||||
|
||||
static void iio_dummy_event_irqmask(struct irq_data *d)
|
||||
{
|
||||
struct irq_chip *chip = irq_data_get_irq_chip(d);
|
||||
struct iio_dummy_eventgen *evgen =
|
||||
container_of(chip, struct iio_dummy_eventgen, chip);
|
||||
|
||||
evgen->enabled[d->irq - evgen->base] = false;
|
||||
}
|
||||
|
||||
static void iio_dummy_event_irqunmask(struct irq_data *d)
|
||||
{
|
||||
struct irq_chip *chip = irq_data_get_irq_chip(d);
|
||||
struct iio_dummy_eventgen *evgen =
|
||||
container_of(chip, struct iio_dummy_eventgen, chip);
|
||||
|
||||
evgen->enabled[d->irq - evgen->base] = true;
|
||||
}
|
||||
|
||||
static int iio_dummy_evgen_create(void)
|
||||
{
|
||||
int ret, i;
|
||||
|
||||
iio_evgen = kzalloc(sizeof(*iio_evgen), GFP_KERNEL);
|
||||
if (iio_evgen == NULL)
|
||||
return -ENOMEM;
|
||||
|
||||
iio_evgen->base = irq_alloc_descs(-1, 0, IIO_EVENTGEN_NO, 0);
|
||||
if (iio_evgen->base < 0) {
|
||||
ret = iio_evgen->base;
|
||||
kfree(iio_evgen);
|
||||
return ret;
|
||||
}
|
||||
iio_evgen->chip.name = iio_evgen_name;
|
||||
iio_evgen->chip.irq_mask = &iio_dummy_event_irqmask;
|
||||
iio_evgen->chip.irq_unmask = &iio_dummy_event_irqunmask;
|
||||
for (i = 0; i < IIO_EVENTGEN_NO; i++) {
|
||||
irq_set_chip(iio_evgen->base + i, &iio_evgen->chip);
|
||||
irq_set_handler(iio_evgen->base + i, &handle_simple_irq);
|
||||
irq_modify_status(iio_evgen->base + i,
|
||||
IRQ_NOREQUEST | IRQ_NOAUTOEN,
|
||||
IRQ_NOPROBE);
|
||||
}
|
||||
mutex_init(&iio_evgen->lock);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* iio_dummy_evgen_get_irq() - get an evgen provided irq for a device
|
||||
*
|
||||
* This function will give a free allocated irq to a client device.
|
||||
* That irq can then be caused to 'fire' by using the associated sysfs file.
|
||||
*/
|
||||
int iio_dummy_evgen_get_irq(void)
|
||||
{
|
||||
int i, ret = 0;
|
||||
mutex_lock(&iio_evgen->lock);
|
||||
for (i = 0; i < IIO_EVENTGEN_NO; i++)
|
||||
if (iio_evgen->inuse[i] == false) {
|
||||
ret = iio_evgen->base + i;
|
||||
iio_evgen->inuse[i] = true;
|
||||
break;
|
||||
}
|
||||
mutex_unlock(&iio_evgen->lock);
|
||||
if (i == IIO_EVENTGEN_NO)
|
||||
return -ENOMEM;
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(iio_dummy_evgen_get_irq);
|
||||
|
||||
/**
|
||||
* iio_dummy_evgen_release_irq() - give the irq back.
|
||||
* @irq: irq being returned to the pool
|
||||
*
|
||||
* Used by client driver instances to give the irqs back when they disconnect
|
||||
*/
|
||||
int iio_dummy_evgen_release_irq(int irq)
|
||||
{
|
||||
mutex_lock(&iio_evgen->lock);
|
||||
iio_evgen->inuse[irq - iio_evgen->base] = false;
|
||||
mutex_unlock(&iio_evgen->lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(iio_dummy_evgen_release_irq);
|
||||
|
||||
static void iio_dummy_evgen_free(void)
|
||||
{
|
||||
irq_free_descs(iio_evgen->base, IIO_EVENTGEN_NO);
|
||||
kfree(iio_evgen);
|
||||
}
|
||||
|
||||
static void iio_evgen_release(struct device *dev)
|
||||
{
|
||||
iio_dummy_evgen_free();
|
||||
}
|
||||
|
||||
static ssize_t iio_evgen_poke(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf,
|
||||
size_t len)
|
||||
{
|
||||
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
||||
|
||||
if (iio_evgen->enabled[this_attr->address])
|
||||
handle_nested_irq(iio_evgen->base + this_attr->address);
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
static IIO_DEVICE_ATTR(poke_ev0, S_IWUSR, NULL, &iio_evgen_poke, 0);
|
||||
static IIO_DEVICE_ATTR(poke_ev1, S_IWUSR, NULL, &iio_evgen_poke, 1);
|
||||
static IIO_DEVICE_ATTR(poke_ev2, S_IWUSR, NULL, &iio_evgen_poke, 2);
|
||||
static IIO_DEVICE_ATTR(poke_ev3, S_IWUSR, NULL, &iio_evgen_poke, 3);
|
||||
static IIO_DEVICE_ATTR(poke_ev4, S_IWUSR, NULL, &iio_evgen_poke, 4);
|
||||
static IIO_DEVICE_ATTR(poke_ev5, S_IWUSR, NULL, &iio_evgen_poke, 5);
|
||||
static IIO_DEVICE_ATTR(poke_ev6, S_IWUSR, NULL, &iio_evgen_poke, 6);
|
||||
static IIO_DEVICE_ATTR(poke_ev7, S_IWUSR, NULL, &iio_evgen_poke, 7);
|
||||
static IIO_DEVICE_ATTR(poke_ev8, S_IWUSR, NULL, &iio_evgen_poke, 8);
|
||||
static IIO_DEVICE_ATTR(poke_ev9, S_IWUSR, NULL, &iio_evgen_poke, 9);
|
||||
|
||||
static struct attribute *iio_evgen_attrs[] = {
|
||||
&iio_dev_attr_poke_ev0.dev_attr.attr,
|
||||
&iio_dev_attr_poke_ev1.dev_attr.attr,
|
||||
&iio_dev_attr_poke_ev2.dev_attr.attr,
|
||||
&iio_dev_attr_poke_ev3.dev_attr.attr,
|
||||
&iio_dev_attr_poke_ev4.dev_attr.attr,
|
||||
&iio_dev_attr_poke_ev5.dev_attr.attr,
|
||||
&iio_dev_attr_poke_ev6.dev_attr.attr,
|
||||
&iio_dev_attr_poke_ev7.dev_attr.attr,
|
||||
&iio_dev_attr_poke_ev8.dev_attr.attr,
|
||||
&iio_dev_attr_poke_ev9.dev_attr.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static const struct attribute_group iio_evgen_group = {
|
||||
.attrs = iio_evgen_attrs,
|
||||
};
|
||||
|
||||
static const struct attribute_group *iio_evgen_groups[] = {
|
||||
&iio_evgen_group,
|
||||
NULL
|
||||
};
|
||||
|
||||
static struct device iio_evgen_dev = {
|
||||
.bus = &iio_bus_type,
|
||||
.groups = iio_evgen_groups,
|
||||
.release = &iio_evgen_release,
|
||||
};
|
||||
static __init int iio_dummy_evgen_init(void)
|
||||
{
|
||||
int ret = iio_dummy_evgen_create();
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
device_initialize(&iio_evgen_dev);
|
||||
dev_set_name(&iio_evgen_dev, "iio_evgen");
|
||||
return device_add(&iio_evgen_dev);
|
||||
}
|
||||
module_init(iio_dummy_evgen_init);
|
||||
|
||||
static __exit void iio_dummy_evgen_exit(void)
|
||||
{
|
||||
device_unregister(&iio_evgen_dev);
|
||||
}
|
||||
module_exit(iio_dummy_evgen_exit);
|
||||
|
||||
MODULE_AUTHOR("Jonathan Cameron <jic23@cam.ac.uk>");
|
||||
MODULE_DESCRIPTION("IIO dummy driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,2 @@
|
|||
int iio_dummy_evgen_get_irq(void);
|
||||
int iio_dummy_evgen_release_irq(int irq);
|
||||
|
|
@ -20,6 +20,8 @@
|
|||
#include <linux/moduleparam.h>
|
||||
|
||||
#include "iio.h"
|
||||
#include "sysfs.h"
|
||||
#include "iio_simple_dummy.h"
|
||||
|
||||
/*
|
||||
* A few elements needed to fake a bus for this driver
|
||||
|
|
@ -53,26 +55,6 @@ static const struct iio_dummy_accel_calibscale dummy_scales[] = {
|
|||
{ 733, 13, 0x9 }, /* 733.00013 */
|
||||
};
|
||||
|
||||
/**
|
||||
* struct iio_dummy_state - device instance specific state.
|
||||
* @dac_val: cache for dac value
|
||||
* @single_ended_adc_val: cache for single ended adc value
|
||||
* @differential_adc_val: cache for differential adc value
|
||||
* @accel_val: cache for acceleration value
|
||||
* @accel_calibbias: cache for acceleration calibbias
|
||||
* @accel_calibscale: cache for acceleration calibscale
|
||||
* @lock: lock to ensure state is consistent
|
||||
*/
|
||||
struct iio_dummy_state {
|
||||
int dac_val;
|
||||
int single_ended_adc_val;
|
||||
int differential_adc_val[2];
|
||||
int accel_val;
|
||||
int accel_calibbias;
|
||||
const struct iio_dummy_accel_calibscale *accel_calibscale;
|
||||
struct mutex lock;
|
||||
};
|
||||
|
||||
/*
|
||||
* iio_dummy_channels - Description of available channels
|
||||
*
|
||||
|
|
@ -101,6 +83,14 @@ static struct iio_chan_spec iio_dummy_channels[] = {
|
|||
*/
|
||||
(1 << IIO_CHAN_INFO_SCALE_SEPARATE),
|
||||
|
||||
#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
|
||||
/*
|
||||
* simple event - triggered when value rises above
|
||||
* a threshold
|
||||
*/
|
||||
.event_mask = IIO_EV_BIT(IIO_EV_TYPE_THRESH,
|
||||
IIO_EV_DIR_RISING),
|
||||
#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
|
||||
},
|
||||
/* Differential ADC channel in_voltage1-voltage2_raw etc*/
|
||||
{
|
||||
|
|
@ -296,6 +286,12 @@ static const struct iio_info iio_dummy_info = {
|
|||
.driver_module = THIS_MODULE,
|
||||
.read_raw = &iio_dummy_read_raw,
|
||||
.write_raw = &iio_dummy_write_raw,
|
||||
#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
|
||||
.read_event_config = &iio_simple_dummy_read_event_config,
|
||||
.write_event_config = &iio_simple_dummy_write_event_config,
|
||||
.read_event_value = &iio_simple_dummy_read_event_value,
|
||||
.write_event_value = &iio_simple_dummy_write_event_value,
|
||||
#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
|
||||
};
|
||||
|
||||
/**
|
||||
|
|
@ -392,11 +388,16 @@ static int __devinit iio_dummy_probe(int index)
|
|||
/* Specify that device provides sysfs type interfaces */
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
|
||||
ret = iio_device_register(indio_dev);
|
||||
ret = iio_simple_dummy_events_register(indio_dev);
|
||||
if (ret < 0)
|
||||
goto error_free_device;
|
||||
ret = iio_device_register(indio_dev);
|
||||
if (ret < 0)
|
||||
goto error_unregister_events;
|
||||
|
||||
return 0;
|
||||
error_unregister_events:
|
||||
iio_simple_dummy_events_unregister(indio_dev);
|
||||
error_free_device:
|
||||
/* Note free device should only be called, before registration
|
||||
* has succeeded. */
|
||||
|
|
@ -413,6 +414,7 @@ error_ret:
|
|||
*/
|
||||
static int iio_dummy_remove(int index)
|
||||
{
|
||||
int ret;
|
||||
/*
|
||||
* Get a pointer to the device instance iio_dev structure
|
||||
* from the bus subsystem. E.g.
|
||||
|
|
@ -421,15 +423,22 @@ static int iio_dummy_remove(int index)
|
|||
*/
|
||||
struct iio_dev *indio_dev = iio_dummy_devs[index];
|
||||
|
||||
|
||||
/* Unregister the device */
|
||||
iio_device_unregister(indio_dev);
|
||||
|
||||
/* Device specific code to power down etc */
|
||||
|
||||
|
||||
ret = iio_simple_dummy_events_unregister(indio_dev);
|
||||
if (ret)
|
||||
goto error_ret;
|
||||
|
||||
/* Free all structures */
|
||||
iio_free_device(indio_dev);
|
||||
|
||||
return 0;
|
||||
error_ret:
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
|
|||
|
|
@ -0,0 +1,81 @@
|
|||
/**
|
||||
* Copyright (c) 2011 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.
|
||||
*
|
||||
* Join together the various functionality of iio_simple_dummy driver
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
|
||||
struct iio_dummy_accel_calibscale;
|
||||
|
||||
/**
|
||||
* struct iio_dummy_state - device instance specific state.
|
||||
* @dac_val: cache for dac value
|
||||
* @single_ended_adc_val: cache for single ended adc value
|
||||
* @differential_adc_val: cache for differential adc value
|
||||
* @accel_val: cache for acceleration value
|
||||
* @accel_calibbias: cache for acceleration calibbias
|
||||
* @accel_calibscale: cache for acceleration calibscale
|
||||
* @lock: lock to ensure state is consistent
|
||||
* @event_irq: irq number for event line (faked)
|
||||
* @event_val: cache for event theshold value
|
||||
* @event_en: cache of whether event is enabled
|
||||
*/
|
||||
struct iio_dummy_state {
|
||||
int dac_val;
|
||||
int single_ended_adc_val;
|
||||
int differential_adc_val[2];
|
||||
int accel_val;
|
||||
int accel_calibbias;
|
||||
const struct iio_dummy_accel_calibscale *accel_calibscale;
|
||||
struct mutex lock;
|
||||
#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
|
||||
int event_irq;
|
||||
int event_val;
|
||||
bool event_en;
|
||||
#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS */
|
||||
};
|
||||
|
||||
#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
|
||||
|
||||
struct iio_dev;
|
||||
|
||||
int iio_simple_dummy_read_event_config(struct iio_dev *indio_dev,
|
||||
u64 event_code);
|
||||
|
||||
int iio_simple_dummy_write_event_config(struct iio_dev *indio_dev,
|
||||
u64 event_code,
|
||||
int state);
|
||||
|
||||
int iio_simple_dummy_read_event_value(struct iio_dev *indio_dev,
|
||||
u64 event_code,
|
||||
int *val);
|
||||
|
||||
int iio_simple_dummy_write_event_value(struct iio_dev *indio_dev,
|
||||
u64 event_code,
|
||||
int val);
|
||||
|
||||
int iio_simple_dummy_events_register(struct iio_dev *indio_dev);
|
||||
int iio_simple_dummy_events_unregister(struct iio_dev *indio_dev);
|
||||
|
||||
#else /* Stubs for when events are disabled at compile time */
|
||||
|
||||
static inline int
|
||||
iio_simple_dummy_events_register(struct iio_dev *indio_dev)
|
||||
{
|
||||
return 0;
|
||||
};
|
||||
|
||||
static inline int
|
||||
iio_simple_dummy_events_unregister(struct iio_dev *indio_dev)
|
||||
{
|
||||
return 0;
|
||||
};
|
||||
|
||||
#endif /* CONFIG_IIO_SIMPLE_DUMMY_EVENTS*/
|
||||
|
||||
|
||||
|
|
@ -0,0 +1,190 @@
|
|||
/**
|
||||
* Copyright (c) 2011 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.
|
||||
*
|
||||
* Event handling elements of industrial I/O reference driver.
|
||||
*/
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/irq.h>
|
||||
|
||||
#include "iio.h"
|
||||
#include "sysfs.h"
|
||||
#include "iio_simple_dummy.h"
|
||||
|
||||
/* Evgen 'fakes' interrupt events for this example */
|
||||
#include "iio_dummy_evgen.h"
|
||||
|
||||
/**
|
||||
* iio_simple_dummy_read_event_config() - is event enabled?
|
||||
* @indio_dev: the device instance data
|
||||
* @event_code: event code of the event being queried
|
||||
*
|
||||
* This function would normally query the relevant registers or a cache to
|
||||
* discover if the event generation is enabled on the device.
|
||||
*/
|
||||
int iio_simple_dummy_read_event_config(struct iio_dev *indio_dev,
|
||||
u64 event_code)
|
||||
{
|
||||
struct iio_dummy_state *st = iio_priv(indio_dev);
|
||||
|
||||
return st->event_en;
|
||||
}
|
||||
|
||||
/**
|
||||
* iio_simple_dummy_write_event_config() - set whether event is enabled
|
||||
* @indio_dev: the device instance data
|
||||
* @event_code: event code of event being enabled/disabled
|
||||
* @state: whether to enable or disable the device.
|
||||
*
|
||||
* This function would normally set the relevant registers on the devices
|
||||
* so that it generates the specified event. Here it just sets up a cached
|
||||
* value.
|
||||
*/
|
||||
int iio_simple_dummy_write_event_config(struct iio_dev *indio_dev,
|
||||
u64 event_code,
|
||||
int state)
|
||||
{
|
||||
struct iio_dummy_state *st = iio_priv(indio_dev);
|
||||
|
||||
/*
|
||||
* Deliberately over the top code splitting to illustrate
|
||||
* how this is done when multiple events exist.
|
||||
*/
|
||||
switch (IIO_EVENT_CODE_EXTRACT_CHAN_TYPE(event_code)) {
|
||||
case IIO_VOLTAGE:
|
||||
switch (IIO_EVENT_CODE_EXTRACT_TYPE(event_code)) {
|
||||
case IIO_EV_TYPE_THRESH:
|
||||
if (IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
|
||||
IIO_EV_DIR_RISING)
|
||||
st->event_en = state;
|
||||
else
|
||||
return -EINVAL;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* iio_simple_dummy_read_event_value() - get value associated with event
|
||||
* @indio_dev: device instance specific data
|
||||
* @event_code: event code for the event whose value is being queried
|
||||
* @val: value for the event code.
|
||||
*
|
||||
* Many devices provide a large set of events of which only a subset may
|
||||
* be enabled at a time, with value registers whose meaning changes depending
|
||||
* on the event enabled. This often means that the driver must cache the values
|
||||
* associated with each possible events so that the right value is in place when
|
||||
* the enabled event is changed.
|
||||
*/
|
||||
int iio_simple_dummy_read_event_value(struct iio_dev *indio_dev,
|
||||
u64 event_code,
|
||||
int *val)
|
||||
{
|
||||
struct iio_dummy_state *st = iio_priv(indio_dev);
|
||||
|
||||
*val = st->event_val;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* iio_simple_dummy_write_event_value() - set value associate with event
|
||||
* @indio_dev: device instance specific data
|
||||
* @event_code: event code for the event whose value is being set
|
||||
* @val: the value to be set.
|
||||
*/
|
||||
int iio_simple_dummy_write_event_value(struct iio_dev *indio_dev,
|
||||
u64 event_code,
|
||||
int val)
|
||||
{
|
||||
struct iio_dummy_state *st = iio_priv(indio_dev);
|
||||
|
||||
st->event_val = val;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* iio_simple_dummy_event_handler() - identify and pass on event
|
||||
* @irq: irq of event line
|
||||
* @private: pointer to device instance state.
|
||||
*
|
||||
* This handler is responsible for querying the device to find out what
|
||||
* event occured and for then pushing that event towards userspace.
|
||||
* Here only one event occurs so we push that directly on with locally
|
||||
* grabbed timestamp.
|
||||
*/
|
||||
static irqreturn_t iio_simple_dummy_event_handler(int irq, void *private)
|
||||
{
|
||||
struct iio_dev *indio_dev = private;
|
||||
iio_push_event(indio_dev,
|
||||
IIO_EVENT_CODE(IIO_VOLTAGE, 0, 0,
|
||||
IIO_EV_DIR_RISING,
|
||||
IIO_EV_TYPE_THRESH, 0, 0, 0),
|
||||
iio_get_time_ns());
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
/**
|
||||
* iio_simple_dummy_events_register() - setup interrupt handling for events
|
||||
* @indio_dev: device instance data
|
||||
*
|
||||
* This function requests the threaded interrupt to handle the events.
|
||||
* Normally the irq is a hardware interrupt and the number comes
|
||||
* from board configuration files. Here we get it from a companion
|
||||
* module that fakes the interrupt for us. Note that module in
|
||||
* no way forms part of this example. Just assume that events magically
|
||||
* appear via the provided interrupt.
|
||||
*/
|
||||
int iio_simple_dummy_events_register(struct iio_dev *indio_dev)
|
||||
{
|
||||
struct iio_dummy_state *st = iio_priv(indio_dev);
|
||||
int ret;
|
||||
|
||||
/* Fire up event source - normally not present */
|
||||
st->event_irq = iio_dummy_evgen_get_irq();
|
||||
if (st->event_irq < 0) {
|
||||
ret = st->event_irq;
|
||||
goto error_ret;
|
||||
}
|
||||
ret = request_threaded_irq(st->event_irq,
|
||||
NULL,
|
||||
&iio_simple_dummy_event_handler,
|
||||
IRQF_ONESHOT,
|
||||
"iio_simple_event",
|
||||
indio_dev);
|
||||
if (ret < 0)
|
||||
goto error_free_evgen;
|
||||
return 0;
|
||||
|
||||
error_free_evgen:
|
||||
iio_dummy_evgen_release_irq(st->event_irq);
|
||||
error_ret:
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* iio_simple_dummy_events_unregister() - tidy up interrupt handling on remove
|
||||
* @indio_dev: device instance data
|
||||
*/
|
||||
int iio_simple_dummy_events_unregister(struct iio_dev *indio_dev)
|
||||
{
|
||||
struct iio_dummy_state *st = iio_priv(indio_dev);
|
||||
|
||||
free_irq(st->event_irq, indio_dev);
|
||||
/* Not part of normal driver */
|
||||
iio_dummy_evgen_release_irq(st->event_irq);
|
||||
|
||||
return 0;
|
||||
}
|
||||
Загрузка…
Ссылка в новой задаче