lkml.org 
[lkml]   [2014]   [Nov]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 1/7] iio: dummy: Add virtual registers for dummy device
Date
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>
---
drivers/staging/iio/iio_dummy_evgen.c | 17 +++++++++++++++++
drivers/staging/iio/iio_dummy_evgen.h | 6 ++++++
drivers/staging/iio/iio_simple_dummy.h | 2 ++
drivers/staging/iio/iio_simple_dummy_events.c | 23 ++++++++++++++++++-----
4 files changed, 43 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/iio/iio_dummy_evgen.c b/drivers/staging/iio/iio_dummy_evgen.c
index 5a804f1..59ad5a3 100644
--- a/drivers/staging/iio/iio_dummy_evgen.c
+++ b/drivers/staging/iio/iio_dummy_evgen.c
@@ -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);
diff --git a/drivers/staging/iio/iio_dummy_evgen.h b/drivers/staging/iio/iio_dummy_evgen.h
index 3a18081..2ac293a 100644
--- a/drivers/staging/iio/iio_dummy_evgen.h
+++ b/drivers/staging/iio/iio_dummy_evgen.h
@@ -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);

diff --git a/drivers/staging/iio/iio_simple_dummy.h b/drivers/staging/iio/iio_simple_dummy.h
index 3027aed..ad89842 100644
--- a/drivers/staging/iio/iio_simple_dummy.h
+++ b/drivers/staging/iio/iio_simple_dummy.h
@@ -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;
diff --git a/drivers/staging/iio/iio_simple_dummy_events.c b/drivers/staging/iio/iio_simple_dummy_events.c
index 64b45b0..719dfa5 100644
--- a/drivers/staging/iio/iio_simple_dummy_events.c
+++ b/drivers/staging/iio/iio_simple_dummy_events.c
@@ -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;
+ }

- 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;
}

@@ -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,
--
1.9.1


\
 
 \ /
  Last update: 2014-11-10 14:21    [W:0.116 / U:8.688 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site