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iio: dummy: Add virtual registers for dummy device 

We need a way to store events generated by iio_dummy_evgen module,
in order to correctly process IRQs in iio_simple_dummy_events.

For the moment, we add two registers:

* id_reg  - ID register, stores the source of the event
* id_data - DATA register, stores the type of the event

e.g echo 4 > /sys/bus/iio/devices/iio_evgen/poke2

id_reg 0x02, id_data 0x04

This means, event of type 4 was generated by fake device 2.

We currently use a hardcoded mapping of virtual events to IIO events.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Daniel Baluta 2014-11-10 14:45:29 +02:00 committed by Jonathan Cameron
parent d7d787d291
commit 356ae946f9
4 changed files with 43 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/staging/iio/iio_dummy_evgen.c
View File

@ -33,6 +33,7 @@
* @base: base of irq range
* @enabled: mask of which irqs are enabled
* @inuse: mask of which irqs are connected
* @regs: irq regs we are faking
* @lock: protect the evgen state
*/
struct iio_dummy_eventgen {
@ -40,6 +41,7 @@ struct iio_dummy_eventgen {
int base;
bool enabled[IIO_EVENTGEN_NO];
bool inuse[IIO_EVENTGEN_NO];
struct iio_dummy_regs regs[IIO_EVENTGEN_NO];
struct mutex lock;
};
@ -136,6 +138,12 @@ int iio_dummy_evgen_release_irq(int irq)
}
EXPORT_SYMBOL_GPL(iio_dummy_evgen_release_irq);
struct iio_dummy_regs *iio_dummy_evgen_get_regs(int irq)
{
return &iio_evgen->regs[irq - iio_evgen->base];
}
EXPORT_SYMBOL_GPL(iio_dummy_evgen_get_regs);
static void iio_dummy_evgen_free(void)
{
irq_free_descs(iio_evgen->base, IIO_EVENTGEN_NO);
@ -153,6 +161,15 @@ static ssize_t iio_evgen_poke(struct device *dev,
size_t len)
{
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
unsigned long event;
int ret;
ret = kstrtoul(buf, 10, &event);
if (ret)
return ret;
iio_evgen->regs[this_attr->address].reg_id = this_attr->address;
iio_evgen->regs[this_attr->address].reg_data = event;
if (iio_evgen->enabled[this_attr->address])
handle_nested_irq(iio_evgen->base + this_attr->address);

6
drivers/staging/iio/iio_dummy_evgen.h
View File

@ -1,6 +1,12 @@
#ifndef _IIO_DUMMY_EVGEN_H_
#define _IIO_DUMMY_EVGEN_H_
struct iio_dummy_regs {
u32 reg_id;
u32 reg_data;
};
struct iio_dummy_regs *iio_dummy_evgen_get_regs(int irq);
int iio_dummy_evgen_get_irq(void);
int iio_dummy_evgen_release_irq(int irq);

2
drivers/staging/iio/iio_simple_dummy.h
View File

@ -13,6 +13,7 @@
#include <linux/kernel.h>
struct iio_dummy_accel_calibscale;
struct iio_dummy_regs;
/**
* struct iio_dummy_state - device instance specific state.
@ -35,6 +36,7 @@ struct iio_dummy_state {
int accel_calibbias;
const struct iio_dummy_accel_calibscale *accel_calibscale;
struct mutex lock;
struct iio_dummy_regs *regs;
#ifdef CONFIG_IIO_SIMPLE_DUMMY_EVENTS
int event_irq;
int event_val;

13
drivers/staging/iio/iio_simple_dummy_events.c
View File

@ -148,12 +148,23 @@ int iio_simple_dummy_write_event_value(struct iio_dev *indio_dev,
static irqreturn_t iio_simple_dummy_event_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct iio_dummy_state *st = iio_priv(indio_dev);
dev_dbg(&indio_dev->dev, "id %x event %x\n",
st->regs->reg_id, st->regs->reg_data);
switch (st->regs->reg_data) {
case 0:
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());
break;
default:
break;
}
return IRQ_HANDLED;
}
@ -179,6 +190,8 @@ int iio_simple_dummy_events_register(struct iio_dev *indio_dev)
ret = st->event_irq;
goto error_ret;
}
st->regs = iio_dummy_evgen_get_regs(st->event_irq);
ret = request_threaded_irq(st->event_irq,
NULL,
&iio_simple_dummy_event_handler,