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From 078005a9c8b5913ed5eb7a7a9508e4b0a5b18c30 Mon Sep 17 00:00:00 2001
From: Steve Sakoman <sakoman@gmail.com>
Date: Tue, 15 Dec 2009 15:24:10 -0800
Subject: [PATCH 09/32] drivers: input: touchscreen: ads7846: return ENODEV if device is not found
Signed-off-by: Steve Sakoman <sakoman@gmail.com>
---
drivers/input/touchscreen/ads7846.c | 13 ++++++++++---
1 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 1de1c19..097db10 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -1338,11 +1338,18 @@ static int __devinit ads7846_probe(struct spi_device *spi)
* the touchscreen, in case it's not connected.
*/
if (ts->model == 7845)
- ads7845_read12_ser(&spi->dev, PWRDOWN);
+ err = ads7845_read12_ser(&spi->dev, PWRDOWN);
else
- (void) ads7846_read12_ser(&spi->dev,
+ err = ads7846_read12_ser(&spi->dev,
READ_12BIT_SER(vaux) | ADS_PD10_ALL_ON);
+ /* if sample is all 0's or all 1's then there is no device on spi */
+ if ( (err == 0x000) || (err == 0xfff)) {
+ dev_info(&spi->dev, "no device detected, test read result was 0x%08X\n", err);
+ err = -ENODEV;
+ goto err_free_irq;
+ }
+
err = sysfs_create_group(&spi->dev.kobj, &ads784x_attr_group);
if (err)
goto err_remove_hwmon;
@@ -1366,7 +1373,7 @@ static int __devinit ads7846_probe(struct spi_device *spi)
err_put_regulator:
regulator_put(ts->reg);
err_free_gpio:
- if (!ts->get_pendown_state)
+ if (!ts->get_pendown_state && ts->gpio_pendown != -1)
gpio_free(ts->gpio_pendown);
err_cleanup_filter:
if (ts->filter_cleanup)
--
1.6.6.1
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