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Date: Tue, 28 Oct 2014 12:19:25 +0200
From: Daniel Baluta <daniel.baluta@...el.com>
To: jic23@...nel.org, linux-iio@...r.kernel.org
Cc: daniel.baluta@...el.com, knaack.h@....de,
linux-kernel@...r.kernel.org, irina.tirdea@...el.com
Subject: [PATCH v3 1/7] 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@...el.com>
Signed-off-by: Daniel Baluta <daniel.baluta@...el.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 d8845e2..3ef3a1c 100644
--- a/drivers/staging/iio/iio_dummy_evgen.h
+++ b/drivers/staging/iio/iio_dummy_evgen.h
@@ -1,2 +1,8 @@
+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 b126196..1a74e26 100644
--- a/drivers/staging/iio/iio_simple_dummy.h
+++ b/drivers/staging/iio/iio_simple_dummy.h
@@ -11,6 +11,7 @@
#include <linux/kernel.h>
struct iio_dummy_accel_calibscale;
+struct iio_dummy_regs;
/**
* struct iio_dummy_state - device instance specific state.
@@ -33,6 +34,7 @@ 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
--
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