At current state ads7846 driver ignore GPIO_ACTIVE_LOW,
GPIO_ACTIVE_HIGH flags in such dts expression:
pendown-gpio = <&gpio5 5 GPIO_ACTIVE_HIGH>;
In times of usage arch/arm/.. you can handle this
by get_pendown_state callback passed via platform_data,
but at now with Device Tree it is impossible to handle
1 as interrupt trigger, this patch fixes this.
Test on beagleboard-xm<-SPI->ads7845
It made on top of "ads7846: fix ads7846 driver for work with ads7845",
but can applied with "hunks" on top of Linus's master,
and it independent of "ads7846: fix ads7846 driver for work with
ads7845".
Signed-off-by: Evgeniy A. Dushistov <dushis...@mail.ru>
---
drivers/input/touchscreen/ads7846.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/drivers/input/touchscreen/ads7846.c
b/drivers/input/touchscreen/ads7846.c
index 76728d4..0a02364 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -140,6 +140,7 @@ struct ads7846 {
void (*filter_cleanup)(void *data);
int (*get_pendown_state)(void);
int gpio_pendown;
+ bool active_low;
void (*wait_for_sync)(void);
};
@@ -574,7 +575,7 @@ static int get_pendown_state(struct ads7846 *ts)
if (ts->get_pendown_state)
return ts->get_pendown_state();
- return !gpio_get_value(ts->gpio_pendown);
+ return ts->active_low != (!!gpio_get_value(ts->gpio_pendown));
}
static void null_wait_for_sync(void)
@@ -1108,11 +1109,13 @@ static const struct of_device_id ads7846_dt_ids[] = {
};
MODULE_DEVICE_TABLE(of, ads7846_dt_ids);
-static const struct ads7846_platform_data *ads7846_probe_dt(struct device *dev)
+static const struct ads7846_platform_data *
+ads7846_probe_dt(struct device *dev, bool *pen_active_low)
{
struct ads7846_platform_data *pdata;
struct device_node *node = dev->of_node;
const struct of_device_id *match;
+ enum of_gpio_flags gpio_flags;
if (!node) {
dev_err(dev, "Device does not have associated DT data\n");
@@ -1163,12 +1166,16 @@ static const struct ads7846_platform_data
*ads7846_probe_dt(struct device *dev)
pdata->wakeup = of_property_read_bool(node, "linux,wakeup");
- pdata->gpio_pendown = of_get_named_gpio(dev->of_node, "pendown-gpio",
0);
+ pdata->gpio_pendown = of_get_named_gpio_flags(dev->of_node,
+ "pendown-gpio",
+ 0, &gpio_flags);
+ *pen_active_low = !!(gpio_flags & OF_GPIO_ACTIVE_LOW);
return pdata;
}
#else
-static const struct ads7846_platform_data *ads7846_probe_dt(struct device *dev)
+static const struct ads7846_platform_data *ads7846_probe_dt(
+ struct device *dev, bool *pen_active_low)
{
dev_err(dev, "no platform data defined\n");
return ERR_PTR(-EINVAL);
@@ -1183,6 +1190,7 @@ static int ads7846_probe(struct spi_device *spi)
struct input_dev *input_dev;
unsigned long irq_flags;
int err;
+ bool pen_active_low = true;
if (!spi->irq) {
dev_dbg(&spi->dev, "no IRQ?\n");
@@ -1226,7 +1234,7 @@ static int ads7846_probe(struct spi_device *spi)
pdata = dev_get_platdata(&spi->dev);
if (!pdata) {
- pdata = ads7846_probe_dt(&spi->dev);
+ pdata = ads7846_probe_dt(&spi->dev, &pen_active_low);
if (IS_ERR(pdata)) {
err = PTR_ERR(pdata);
goto err_free_mem;
@@ -1240,6 +1248,7 @@ static int ads7846_probe(struct spi_device *spi)
ts->vref_mv = pdata->vref_mv;
ts->swap_xy = pdata->swap_xy;
+ ts->active_low = pen_active_low;
if (pdata->filter != NULL) {
if (pdata->filter_init != NULL) {
--
2.3.6
--
/Evgeniy
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
