staging:iio:adc:ad7745 move from old to current event handling.

Nice simple one.  Not sure we actually want devices outputting
datardy signals like that, but I'll leave it for now.
Cleaned up some unneeded functions whilst here.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/adc/ad7745.c

@@ -8,14 +8,12 @@
 
 #include <linux/interrupt.h>
 #include <linux/gpio.h>
-#include <linux/workqueue.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/list.h>
 #include <linux/i2c.h>
-#include <linux/rtc.h>
 
 #include "../iio.h"
 #include "../sysfs.h"
@@ -58,9 +56,7 @@ struct ad774x_chip_info {
 	const char *name;
 	struct i2c_client *client;
 	struct iio_dev *indio_dev;
-	struct work_struct thresh_work;
 	bool inter;
-	s64 last_timestamp;
 	u16 cap_offs;                   /* Capacitive offset */
 	u16 cap_gain;                   /* Capacitive gain calibration */
 	u16 volt_gain;                  /* Voltage gain calibration */
@@ -76,7 +72,8 @@ struct ad774x_conversion_mode {
 	u8 reg_cfg;
 };
 
-struct ad774x_conversion_mode ad774x_conv_mode_table[AD774X_MAX_CONV_MODE] = {
+static struct ad774x_conversion_mode
+ad774x_conv_mode_table[AD774X_MAX_CONV_MODE] = {
 	{ "idle", 0 },
 	{ "continuous-conversion", 1 },
 	{ "single-conversion", 2 },
@@ -547,67 +544,33 @@ static const struct attribute_group ad774x_attribute_group = {
 #define IIO_EVENT_ATTR_VT_RDY_SH(_evlist, _show, _store, _mask)	\
 	IIO_EVENT_ATTR_SH(vt_rdy, _evlist, _show, _store, _mask)
 
-static void ad774x_interrupt_handler_bh(struct work_struct *work_s)
+static irqreturn_t ad774x_event_handler(int irq, void *private)
 {
-	struct ad774x_chip_info *chip =
-		container_of(work_s, struct ad774x_chip_info, thresh_work);
+	struct iio_dev *indio_dev = private;
+	struct ad774x_chip_info *chip = iio_dev_get_devdata(indio_dev);
 	u8 int_status;
 
-	enable_irq(chip->client->irq);
-
 	ad774x_i2c_read(chip, AD774X_STATUS, &int_status, 1);
 
 	if (int_status & AD774X_STATUS_RDYCAP)
-		iio_push_event(chip->indio_dev, 0,
-				IIO_EVENT_CODE_CAP_RDY,
-				chip->last_timestamp);
+		iio_push_event(indio_dev, 0,
+			       IIO_EVENT_CODE_CAP_RDY,
+			       iio_get_time_ns());
 
 	if (int_status & AD774X_STATUS_RDYVT)
-		iio_push_event(chip->indio_dev, 0,
-				IIO_EVENT_CODE_VT_RDY,
-				chip->last_timestamp);
-}
-
-static int ad774x_interrupt_handler_th(struct iio_dev *dev_info,
-		int index,
-		s64 timestamp,
-		int no_test)
-{
-	struct ad774x_chip_info *chip = dev_info->dev_data;
-
-	chip->last_timestamp = timestamp;
-	schedule_work(&chip->thresh_work);
-
-	return 0;
-}
-
-IIO_EVENT_SH(data_rdy, &ad774x_interrupt_handler_th);
-
-static ssize_t ad774x_query_out_mode(struct device *dev,
-		struct device_attribute *attr,
-		char *buf)
-{
-	/*
-	 * AD774X provides one /RDY pin, which can be used as interrupt
-	 * but the pin is not configurable
-	 */
-	return sprintf(buf, "1\n");
-}
+		iio_push_event(indio_dev, 0,
+			       IIO_EVENT_CODE_VT_RDY,
+			       iio_get_time_ns());
 
-static ssize_t ad774x_set_out_mode(struct device *dev,
-		struct device_attribute *attr,
-		const char *buf,
-		size_t len)
-{
-	return len;
+	return IRQ_HANDLED;
 }
 
-IIO_EVENT_ATTR_CAP_RDY_SH(iio_event_data_rdy, ad774x_query_out_mode, ad774x_set_out_mode, 0);
-IIO_EVENT_ATTR_VT_RDY_SH(iio_event_data_rdy, ad774x_query_out_mode, ad774x_set_out_mode, 0);
+static IIO_CONST_ATTR(cap_rdy_en, "1");
+static IIO_CONST_ATTR(vt_rdy_en, "1");
 
 static struct attribute *ad774x_event_attributes[] = {
-	&iio_event_attr_cap_rdy.dev_attr.attr,
-	&iio_event_attr_vt_rdy.dev_attr.attr,
+	&iio_const_attr_cap_rdy_en.dev_attr.attr,
+	&iio_const_attr_vt_rdy_en.dev_attr.attr,
 	NULL,
 };
 
@@ -656,18 +619,14 @@ static int __devinit ad774x_probe(struct i2c_client *client,
 	regdone = 1;
 
 	if (client->irq) {
-		ret = iio_register_interrupt_line(client->irq,
-				chip->indio_dev,
-				0,
-				IRQF_TRIGGER_FALLING,
-				"ad774x");
+		ret = request_threaded_irq(client->irq,
+					   NULL,
+					   &ad774x_event_handler,
+					   IRQF_TRIGGER_FALLING,
+					   "ad774x",
+					   chip->indio_dev);
 		if (ret)
 			goto error_free_dev;
-
-		iio_add_event_to_list(iio_event_attr_cap_rdy.listel,
-				&chip->indio_dev->interrupts[0]->ev_list);
-
-		INIT_WORK(&chip->thresh_work, ad774x_interrupt_handler_bh);
 	}
 
 	dev_err(&client->dev, "%s capacitive sensor registered, irq: %d\n", id->name, client->irq);
@@ -676,7 +635,7 @@ static int __devinit ad774x_probe(struct i2c_client *client,
 
 error_free_dev:
 	if (regdone)
-		iio_device_unregister(chip->indio_dev);
+		free_irq(client->irq, chip->indio_dev);
 	else
 		iio_free_device(chip->indio_dev);
 error_free_chip:
@@ -691,7 +650,7 @@ static int __devexit ad774x_remove(struct i2c_client *client)
 	struct iio_dev *indio_dev = chip->indio_dev;
 
 	if (client->irq)
-		iio_unregister_interrupt_line(indio_dev, 0);
+		free_irq(client->irq, indio_dev);
 	iio_device_unregister(indio_dev);
 	kfree(chip);