linux-kernel - Re: [PATCH 2/2] tsc2007: reduced number of I2C transfers

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Date:	Tue, 04 Aug 2009 14:12:35 +0200
From:	Richard Röjfors 
	<richard.rojfors.ext@...ean-labs.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	linux-input@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	kwangwoo.lee@...il.com,
	Thierry Reding <thierry.reding@...onic-design.de>,
	Trilok Soni <soni.trilok@...il.com>
Subject: Re: [PATCH 2/2] tsc2007: reduced number of I2C transfers

Dmitry Torokhov wrote:
> 
> 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 <richard.rojfors.ext@...ean-labs.com>
---
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);
   err_free_irq:
  	tsc2007_free_irq(ts);
  	if (pdata->exit_platform_hw)
--
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