From: Chris Morgan <macromorgan@xxxxxxxxxxx>
Add polled input device support to the adc-joystick driver. This is
useful for devices which do not have hardware capable triggers on
their SARADC. Code modified from adc-joystick.c changes made by Maya
Matuszczyk.
Signed-off-by: Maya Matuszczyk <maccraft123mc@xxxxxxxxx>
Signed-off-by: Chris Morgan <macromorgan@xxxxxxxxxxx>
---
drivers/input/joystick/adc-joystick.c | 48 +++++++++++++++++++++++++--
1 file changed, 45 insertions(+), 3 deletions(-)
diff --git a/drivers/input/joystick/adc-joystick.c b/drivers/input/joystick/adc-joystick.c
index e0cfdc84763f..3942574e8ecf 100644
--- a/drivers/input/joystick/adc-joystick.c
+++ b/drivers/input/joystick/adc-joystick.c
@@ -26,8 +26,23 @@ struct adc_joystick {
struct adc_joystick_axis *axes;
struct iio_channel *chans;
int num_chans;
+ bool polled;
};
+static void adc_joystick_poll(struct input_dev *input)
+{
+ struct adc_joystick *joy = input_get_drvdata(input);
+ int i, val, ret;
+
+ for (i = 0; i < joy->num_chans; i++) {
+ ret = iio_read_channel_raw(&joy->chans[i], &val);
+ if (ret < 0)
+ return;
+ input_report_abs(input, joy->axes[i].code, val);
+ }
+ input_sync(input);
+}
+
static int adc_joystick_handle(const void *data, void *private)
{
struct adc_joystick *joy = private;
@@ -179,6 +194,7 @@ static int adc_joystick_probe(struct platform_device *pdev)
int error;
int bits;
int i;
+ unsigned int poll_interval;
joy = devm_kzalloc(dev, sizeof(*joy), GFP_KERNEL);
if (!joy)
@@ -192,8 +208,25 @@ static int adc_joystick_probe(struct platform_device *pdev)
return error;
}
- /* Count how many channels we got. NULL terminated. */
+ error = device_property_read_u32(dev, "poll-interval", &poll_interval);
+ if (error) {
+ /* -EINVAL means the property is absent. */
+ if (error != -EINVAL)
+ return error;
+ } else if (poll_interval == 0) {
+ dev_err(dev, "Unable to get poll-interval\n");
+ return -EINVAL;
+ } else {
+ joy->polled = true;
+ }
+
+ /*
+ * Count how many channels we got. NULL terminated.
+ * Do not check the storage size if using polling.
+ */
for (i = 0; joy->chans[i].indio_dev; i++) {
+ if (joy->polled)
+ continue;
bits = joy->chans[i].channel->scan_type.storagebits;
if (!bits || bits > 16) {
dev_err(dev, "Unsupported channel storage size\n");
@@ -215,13 +248,20 @@ static int adc_joystick_probe(struct platform_device *pdev)
joy->input = input;
input->name = pdev->name;
input->id.bustype = BUS_HOST;
- input->open = adc_joystick_open;
- input->close = adc_joystick_close;
error = adc_joystick_set_axes(dev, joy);
if (error)
return error;
+ if (joy->polled) {
+ input_setup_polling(input, adc_joystick_poll);
+ input_set_poll_interval(input, poll_interval);
+ goto register_joystick;
+ } else {
+ input->open = adc_joystick_open;
+ input->close = adc_joystick_close;
+ }
+
joy->buffer = iio_channel_get_all_cb(dev, adc_joystick_handle, joy);
if (IS_ERR(joy->buffer)) {
dev_err(dev, "Unable to allocate callback buffer\n");
@@ -234,6 +274,8 @@ static int adc_joystick_probe(struct platform_device *pdev)
return error;
}
+register_joystick:
+
input_set_drvdata(input, joy);
error = input_register_device(input);
--
2.25.1
