Input: adc-keys - switch to using polled mode of input devices

We have added polled mode to the normal input devices with the intent of
retiring input_polled_dev. This converts adc-keys driver to use the
polling mode of standard input devices and removes dependency on
INPUT_POLLDEV.
Acked-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.kernel.org/r/20191017204217.106453-6-dmitry.torokhov@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/Kconfig

@@ -16,7 +16,6 @@ if INPUT_KEYBOARD
 config KEYBOARD_ADC
 	tristate "ADC Ladder Buttons"
 	depends on IIO
-	select INPUT_POLLDEV
 	help
 	  This driver implements support for buttons connected
 	  to an ADC using a resistor ladder.

drivers/input/keyboard/adc-keys.c

@@ -9,7 +9,6 @@
 #include <linux/iio/consumer.h>
 #include <linux/iio/types.h>
 #include <linux/input.h>
-#include <linux/input-polldev.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/of.h>
@@ -30,9 +29,9 @@ struct adc_keys_state {
 	const struct adc_keys_button *map;
 };
 
-static void adc_keys_poll(struct input_polled_dev *dev)
+static void adc_keys_poll(struct input_dev *input)
 {
-	struct adc_keys_state *st = dev->private;
+	struct adc_keys_state *st = input_get_drvdata(input);
 	int i, value, ret;
 	u32 diff, closest = 0xffffffff;
 	int keycode = 0;
@@ -55,12 +54,12 @@ static void adc_keys_poll(struct input_polled_dev *dev)
 		keycode = 0;
 
 	if (st->last_key && st->last_key != keycode)
-		input_report_key(dev->input, st->last_key, 0);
+		input_report_key(input, st->last_key, 0);
 
 	if (keycode)
-		input_report_key(dev->input, keycode, 1);
+		input_report_key(input, keycode, 1);
 
-	input_sync(dev->input);
+	input_sync(input);
 	st->last_key = keycode;
 }
 
@@ -108,7 +107,6 @@ static int adc_keys_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct adc_keys_state *st;
-	struct input_polled_dev *poll_dev;
 	struct input_dev *input;
 	enum iio_chan_type type;
 	int i, value;
@@ -145,19 +143,13 @@ static int adc_keys_probe(struct platform_device *pdev)
 	if (error)
 		return error;
 
-	poll_dev = devm_input_allocate_polled_device(dev);
-	if (!poll_dev) {
+	input = devm_input_allocate_device(dev);
+	if (!input) {
 		dev_err(dev, "failed to allocate input device\n");
 		return -ENOMEM;
 	}
 
-	if (!device_property_read_u32(dev, "poll-interval", &value))
-		poll_dev->poll_interval = value;
-
-	poll_dev->poll = adc_keys_poll;
-	poll_dev->private = st;
-
-	input = poll_dev->input;
+	input_set_drvdata(input, st);
 
 	input->name = pdev->name;
 	input->phys = "adc-keys/input0";
@@ -174,7 +166,17 @@ static int adc_keys_probe(struct platform_device *pdev)
 	if (device_property_read_bool(dev, "autorepeat"))
 		__set_bit(EV_REP, input->evbit);
 
-	error = input_register_polled_device(poll_dev);
+
+	error = input_setup_polling(input, adc_keys_poll);
+	if (error) {
+		dev_err(dev, "Unable to set up polling: %d\n", error);
+		return error;
+	}
+
+	if (!device_property_read_u32(dev, "poll-interval", &value))
+		input_set_poll_interval(input, value);
+
+	error = input_register_device(input);
 	if (error) {
 		dev_err(dev, "Unable to register input device: %d\n", error);
 		return error;