staging: iio: remove specific chrdev for event reading. Get fd from i…

…octl on buffer.

Change suggested by Arnd Bergmann.

No real reason to have two chrdevs per device. This step merges them into one.
Currently this means that events will only work on devices with buffers. THat will
be remedied shortly.

V2: set name for event attribute groups.  Otherwise they all sorts of fun occurs on
dynamic channel event attribute creation.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/accel/sca3000_core.c

@@ -1036,6 +1036,7 @@ static struct attribute *sca3000_event_attributes[] = {
 
 static struct attribute_group sca3000_event_attribute_group = {
 	.attrs = sca3000_event_attributes,
+	.name = "events",
 };
 
 /**

drivers/staging/iio/adc/ad7150.c

@@ -700,6 +700,7 @@ static struct attribute *ad7150_event_attributes[] = {
 
 static struct attribute_group ad7150_event_attribute_group = {
 	.attrs = ad7150_event_attributes,
+	.name = "events",
 };
 
 static const struct iio_info ad7150_info = {

drivers/staging/iio/adc/ad7745.c

@@ -563,6 +563,7 @@ static struct attribute *ad774x_event_attributes[] = {
 
 static struct attribute_group ad774x_event_attribute_group = {
 	.attrs = ad774x_event_attributes,
+	.name = "events",
 };
 
 static const struct iio_info ad774x_info = {

drivers/staging/iio/adc/ad7816.c

@@ -329,6 +329,7 @@ static struct attribute *ad7816_event_attributes[] = {
 
 static struct attribute_group ad7816_event_attribute_group = {
 	.attrs = ad7816_event_attributes,
+	.name = "events",
 };
 
 static const struct iio_info ad7816_info = {

drivers/staging/iio/adc/ad799x_core.c

@@ -447,6 +447,7 @@ static struct attribute *ad7993_4_7_8_event_attributes[] = {
 
 static struct attribute_group ad7993_4_7_8_event_attrs_group = {
 	.attrs = ad7993_4_7_8_event_attributes,
+	.name = "events",
 };
 
 static struct attribute *ad7992_event_attributes[] = {
@@ -463,6 +464,7 @@ static struct attribute *ad7992_event_attributes[] = {
 
 static struct attribute_group ad7992_event_attrs_group = {
 	.attrs = ad7992_event_attributes,
+	.name = "events",
 };
 
 static const struct iio_info ad7991_info = {

drivers/staging/iio/adc/adt7310.c

@@ -741,8 +741,10 @@ static struct attribute *adt7310_event_ct_attributes[] = {
 static struct attribute_group adt7310_event_attribute_group[ADT7310_IRQS] = {
 	{
 		.attrs = adt7310_event_int_attributes,
+		.name = "events",
 	}, {
 		.attrs = adt7310_event_ct_attributes,
+		.name = "events",
 	}
 };
 

drivers/staging/iio/adc/adt7410.c

@@ -708,8 +708,10 @@ static struct attribute *adt7410_event_ct_attributes[] = {
 static struct attribute_group adt7410_event_attribute_group[ADT7410_IRQS] = {
 	{
 		.attrs = adt7410_event_int_attributes,
+		.name = "events",
 	}, {
 		.attrs = adt7410_event_ct_attributes,
+		.name = "events",
 	}
 };
 

drivers/staging/iio/adc/adt75.c

@@ -530,6 +530,7 @@ static struct attribute *adt75_event_attributes[] = {
 
 static struct attribute_group adt75_event_attribute_group = {
 	.attrs = adt75_event_attributes,
+	.name = "events",
 };
 
 static const struct iio_info adt75_info = {

drivers/staging/iio/adc/max1363_core.c

@@ -827,6 +827,7 @@ static struct attribute *max1363_event_attributes[] = {
 
 static struct attribute_group max1363_event_attribute_group = {
 	.attrs = max1363_event_attributes,
+	.name = "events",
 };
 
 #define MAX1363_EVENT_FUNCS						\
@@ -1296,7 +1297,8 @@ static int __devinit max1363_probe(struct i2c_client *client,
 	/* Estabilish that the iio_dev is a child of the i2c device */
 	indio_dev->dev.parent = &client->dev;
 	indio_dev->name = id->name;
-
+	indio_dev->channels = st->chip_info->channels;
+	indio_dev->num_channels = st->chip_info->num_channels;
 	indio_dev->info = st->chip_info->info;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->channels = st->chip_info->channels;

drivers/staging/iio/addac/adt7316.c

@@ -2064,6 +2064,7 @@ static struct attribute *adt7316_event_attributes[] = {
 
 static struct attribute_group adt7316_event_attribute_group = {
 	.attrs = adt7316_event_attributes,
+	.name = "events",
 };
 
 static struct attribute *adt7516_event_attributes[] = {
@@ -2084,6 +2085,7 @@ static struct attribute *adt7516_event_attributes[] = {
 
 static struct attribute_group adt7516_event_attribute_group = {
 	.attrs = adt7516_event_attributes,
+	.name = "events",
 };
 
 #ifdef CONFIG_PM

drivers/staging/iio/chrdev.h

@@ -40,4 +40,5 @@ struct iio_event_data {
 	s64	timestamp;
 };
 
+#define IIO_GET_EVENT_FD_IOCTL _IOR('i', 0x90, int)
 #endif

drivers/staging/iio/dac/ad5504.c

@@ -247,6 +247,7 @@ static struct attribute *ad5504_ev_attributes[] = {
 
 static struct attribute_group ad5504_ev_attribute_group = {
 	.attrs = ad5504_ev_attributes,
+	.name = "events",
 };
 
 static irqreturn_t ad5504_event_handler(int irq, void *private)

drivers/staging/iio/iio.h

@@ -245,6 +245,7 @@ struct iio_info {
 
 };
 
+int iio_event_getfd(struct iio_dev *indio_dev);
 /**
  * struct iio_dev - industrial I/O device
  * @id:			[INTERN] used to identify device internally