Input: ads7846 - add pen_down sysfs attribute
It's handy for userspace diagnostics to see the pen down status, to
see whether the touchscreen is "stuck" (shortcircuited).
Signed-off-by: Imre Deak <imre.deak@nokia.com>
Signed-off-by: Juha Yrjola <juha.yrjola@nokia.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 46d1fec..7f384a6 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -233,6 +233,21 @@
SHOW(vaux)
SHOW(vbatt)
+static int is_pen_down(struct device *dev)
+{
+ struct ads7846 *ts = dev_get_drvdata(dev);
+
+ return ts->pendown;
+}
+
+static ssize_t ads7846_pen_down_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%u\n", is_pen_down(dev));
+}
+
+static DEVICE_ATTR(pen_down, S_IRUGO, ads7846_pen_down_show, NULL);
+
/*--------------------------------------------------------------------------*/
/*
@@ -559,6 +574,8 @@
device_create_file(&spi->dev, &dev_attr_vbatt);
device_create_file(&spi->dev, &dev_attr_vaux);
+ device_create_file(&spi->dev, &dev_attr_pen_down);
+
err = input_register_device(input_dev);
if (err)
goto err_free_irq;
@@ -582,6 +599,8 @@
if (ts->irq_disabled)
enable_irq(ts->spi->irq);
+ device_remove_file(&spi->dev, &dev_attr_pen_down);
+
if (ts->model == 7846) {
device_remove_file(&spi->dev, &dev_attr_temp0);
device_remove_file(&spi->dev, &dev_attr_temp1);