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authorSebastian Reichel <sebastian.reichel@collabora.com>2020-08-06 16:06:36 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2020-08-06 17:34:18 -0700
commit27aced19e098ba00e87a09d6ba6d4518e89319c3 (patch)
treedb611b8c84e899f47c24277b4e355316b130b2a0 /drivers
parent3bdd21c6937a07f2877409bcdafc0ae2265fc981 (diff)
downloadlinux-27aced19e098ba00e87a09d6ba6d4518e89319c3.tar.bz2
Input: exc3000 - add reset gpio support
Add basic support for an optional reset gpio. Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com> Acked-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20200805160520.456570-4-sebastian.reichel@collabora.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/input/touchscreen/exc3000.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/exc3000.c b/drivers/input/touchscreen/exc3000.c
index b497bd2ae41d..203f50acaab7 100644
--- a/drivers/input/touchscreen/exc3000.c
+++ b/drivers/input/touchscreen/exc3000.c
@@ -8,7 +8,9 @@
*/
#include <linux/bitops.h>
+#include <linux/delay.h>
#include <linux/device.h>
+#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
@@ -30,6 +32,9 @@
#define EXC3000_TIMEOUT_MS 100
+#define EXC3000_RESET_MS 10
+#define EXC3000_READY_MS 100
+
static const struct i2c_device_id exc3000_id[];
struct eeti_dev_info {
@@ -63,6 +68,7 @@ struct exc3000_data {
const struct eeti_dev_info *info;
struct input_dev *input;
struct touchscreen_properties prop;
+ struct gpio_desc *reset;
struct timer_list timer;
u8 buf[2 * EXC3000_LEN_FRAME];
};
@@ -204,6 +210,17 @@ static int exc3000_probe(struct i2c_client *client)
}
timer_setup(&data->timer, exc3000_timer, 0);
+ data->reset = devm_gpiod_get_optional(&client->dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(data->reset))
+ return PTR_ERR(data->reset);
+
+ if (data->reset) {
+ msleep(EXC3000_RESET_MS);
+ gpiod_set_value_cansleep(data->reset, 0);
+ msleep(EXC3000_READY_MS);
+ }
+
input = devm_input_allocate_device(&client->dev);
if (!input)
return -ENOMEM;