[PATCH v4 3/8] drivers:input:tsc2007: check for presence and power down tsc2007 during probe

[H. Nikolaus Schaller]

1. check if chip is really present and don't succeed if it isn't.
2. if it succeeds, power down the chip until accessed

Signed-off-by: H. Nikolaus Schaller 
---
 drivers/input/touchscreen/tsc2007.c | 9 +
 1 file changed, 9 insertions(+)

diff --git a/drivers/input/touchscreen/tsc2007.c 
b/drivers/input/touchscreen/tsc2007.c
index e9d5086..c314331 100644
--- a/drivers/input/touchscreen/tsc2007.c
+++ b/drivers/input/touchscreen/tsc2007.c
@@ -538,6 +538,15 @@ static int tsc2007_probe(struct i2c_client *client,
 
tsc2007_stop(ts);
 
+   /* power down the chip (TSC2007_SETUP does not ACK on I2C) */
+   err = tsc2007_xfer(ts, PWRDOWN);
+   if (err < 0) {
+   dev_err(>dev,
+   "Failed to setup chip: %d\n", err);
+   iio_device_unregister(indio_dev);
+   return err; /* usually, chip does not respond */
+   }
+
err = input_register_device(input_dev);
if (err) {
dev_err(>dev,
-- 
2.7.3

[PATCH v4 3/8] drivers:input:tsc2007: check for presence and power down tsc2007 during probe

[H. Nikolaus Schaller]

1. check if chip is really present and don't succeed if it isn't.
2. if it succeeds, power down the chip until accessed

Signed-off-by: H. Nikolaus Schaller 
---
 drivers/input/touchscreen/tsc2007.c | 9 +
 1 file changed, 9 insertions(+)

diff --git a/drivers/input/touchscreen/tsc2007.c 
b/drivers/input/touchscreen/tsc2007.c
index e9d5086..c314331 100644
--- a/drivers/input/touchscreen/tsc2007.c
+++ b/drivers/input/touchscreen/tsc2007.c
@@ -538,6 +538,15 @@ static int tsc2007_probe(struct i2c_client *client,
 
tsc2007_stop(ts);
 
+   /* power down the chip (TSC2007_SETUP does not ACK on I2C) */
+   err = tsc2007_xfer(ts, PWRDOWN);
+   if (err < 0) {
+   dev_err(>dev,
+   "Failed to setup chip: %d\n", err);
+   iio_device_unregister(indio_dev);
+   return err; /* usually, chip does not respond */
+   }
+
err = input_register_device(input_dev);
if (err) {
dev_err(>dev,
-- 
2.7.3