Dmitry Torokhov wrote:

quoted

I modified the patch a bit before applying. In fact there were a few
changes to all the patces so it would be nice if you could take a look
at the 'next' branch of my tree:

	git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git next

Also, I di dnot quite like the logic of the patch making
get_pendown_state callback optional; could you please try the patch
below and let me know of it works for you?

I like your changes, there is just a small miss while checking the  
platform data. You forgot to remove the check for get_pen_down_state in  
the probe function, see the patch below (to be applied on top of yours):

I also would like a check if the power down failed or not during probe.

--Richard

Input: tsc2007 - Check if I2C communication works during probe

Check the result when sending the power down command to the controller.

Signed-off-by: Richard Röjfors <redacted>
---
Index: linux-2.6.31-rc2/drivers/input/touchscreen/tsc2007.c
===================================================================

--- linux-2.6.31-rc2/drivers/input/touchscreen/tsc2007.c	(revision 1071)
+++ linux-2.6.31-rc2/drivers/input/touchscreen/tsc2007.c	(revision 1073)

@@ -269,7 +269,7 @@
 	struct input_dev *input_dev;
 	int err;

-	if (!pdata || !pdata->get_pendown_state) {
+	if (!pdata) {
 		dev_err(&client->dev, "platform data is required!\n");
 		return -EINVAL;
 	}

@@ -326,10 +326,14 @@
 	i2c_set_clientdata(client, ts);

 	/* Prepare for touch readings - power down ADC and enable PENIRQ */
-	tsc2007_xfer(ts, PWRDOWN);
+	err = tsc2007_xfer(ts, PWRDOWN);
+	if (err < 0)
+		goto err_unreg_dev;

 	return 0;

+ err_unreg_dev:
+	input_unregister_device(ts->input);