Thread (94 messages) 94 messages, 11 authors, 2017-02-23

Re: [PATCH v9 2/8] drivers:input:tsc2007: check for presence and power down tsc2007 during probe

From: Dmitry Torokhov <hidden>
Date: 2017-02-17 20:52:52
Also in: linux-iio, linux-input, linux-omap, lkml

On Wed, Dec 28, 2016 at 03:53:17PM +0100, H. Nikolaus Schaller wrote:
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 <redacted>
Applied, thank you.
quoted hunk ↗ jump to hunk
---
 drivers/input/touchscreen/tsc2007.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c
index c1d9593..76b462b 100644
--- a/drivers/input/touchscreen/tsc2007.c
+++ b/drivers/input/touchscreen/tsc2007.c
@@ -529,6 +529,14 @@ 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(&client->dev,
+			"Failed to setup chip: %d\n", err);
+		return err;	/* usually, chip does not respond */
+	}
+
 	err = input_register_device(input_dev);
 	if (err) {
 		dev_err(&client->dev,
-- 
2.7.3
-- 
Dmitry
--
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