diff options
Diffstat (limited to 'recipes/linux/linux-omap-pm-2.6.29/ads7846-detection.patch')
| -rw-r--r-- | recipes/linux/linux-omap-pm-2.6.29/ads7846-detection.patch | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/recipes/linux/linux-omap-pm-2.6.29/ads7846-detection.patch b/recipes/linux/linux-omap-pm-2.6.29/ads7846-detection.patch new file mode 100644 index 0000000000..25a1cb052c --- /dev/null +++ b/recipes/linux/linux-omap-pm-2.6.29/ads7846-detection.patch @@ -0,0 +1,41 @@ +diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c +index 2ae5ab8..a68b0a6 100644 +--- a/drivers/input/touchscreen/ads7846.c ++++ b/drivers/input/touchscreen/ads7846.c +@@ -1154,9 +1154,16 @@ static int __devinit ads7846_probe(struct spi_device *spi) + /* take a first sample, leaving nPENIRQ active and vREF off; avoid + * the touchscreen, in case it's not connected. + */ +- (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; +@@ -1174,7 +1181,7 @@ static int __devinit ads7846_probe(struct spi_device *spi) + err_free_irq: + free_irq(spi->irq, ts); + err_free_gpio: +- if (ts->gpio_pendown != -1) ++ if (!ts->get_pendown_state && ts->gpio_pendown != -1) + gpio_free(ts->gpio_pendown); + err_cleanup_filter: + if (ts->filter_cleanup) +@@ -1201,7 +1208,7 @@ static int __devexit ads7846_remove(struct spi_device *spi) + /* suspend left the IRQ disabled */ + enable_irq(ts->spi->irq); + +- if (ts->gpio_pendown != -1) ++ if (!ts->get_pendown_state && ts->gpio_pendown != -1) + gpio_free(ts->gpio_pendown); + + if (ts->filter_cleanup) + |