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From: Jiada Wang <jiada_wang@mentor.com>
To: <nick@shmanahar.org>, <dmitry.torokhov@gmail.com>,
	<jikos@kernel.org>, <benjamin.tissoires@redhat.com>,
	<rydberg@bitmath.org>
Cc: <linux-input@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<jiada_wang@mentor.com>
Subject: [PATCH v3 34/49] input: atmel_mxt_ts: export GPIO reset line via sysfs
Date: Tue, 17 Sep 2019 18:41:22 +0900	[thread overview]
Message-ID: <20190917094137.18851-1-jiada_wang@mentor.com> (raw)

From: "George G. Davis" <george_davis@mentor.com>

N.B. Modifying the atmel_mxt_ts GPIO reset line during operation will
cause problems with normal driver operation.  This feature is provided
as a diagnostic debug aid.  It does not take into consideration any
pending operations which may be in progress.  Modifying the atmel_mxt_ts
GPIO reset line at any time will inevitably cause the driver to fail.

Signed-off-by: George G. Davis <george_davis@mentor.com>
Signed-off-by: Rajeev Kumar <rajeev_kumar@mentor.com>
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index bdc5088baea8..4670880e52a2 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -4086,6 +4086,19 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		return error;
 	}
 
+	if (data->reset_gpio) {
+		error = gpiod_export(data->reset_gpio, 0);
+		if (error)
+			return error;
+
+		error = gpiod_export_link(&client->dev, "reset",
+					  data->reset_gpio);
+		if (error) {
+			gpiod_unexport(data->reset_gpio);
+			return error;
+		}
+	}
+
 	if (data->suspend_mode == MXT_SUSPEND_REGULATOR) {
 		error = mxt_acquire_irq(data);
 		if (error)
@@ -4118,6 +4131,10 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 err_free_object:
 	mxt_free_input_device(data);
 	mxt_free_object_table(data);
+	if (data->reset_gpio) {
+		sysfs_remove_link(&client->dev.kobj, "reset");
+		gpiod_unexport(data->reset_gpio);
+	}
 	return error;
 }
 
@@ -4127,6 +4144,10 @@ static int mxt_remove(struct i2c_client *client)
 
 	disable_irq(data->irq);
 	sysfs_remove_group(&client->dev.kobj, &mxt_fw_attr_group);
+	if (data->reset_gpio) {
+		sysfs_remove_link(&client->dev.kobj, "reset");
+		gpiod_unexport(data->reset_gpio);
+	}
 	mxt_debug_msg_remove(data);
 	mxt_sysfs_remove(data);
 	mxt_free_input_device(data);
-- 
2.19.2


WARNING: multiple messages have this Message-ID (diff)
From: Jiada Wang <jiada_wang@mentor.com>
To: nick@shmanahar.org, dmitry.torokhov@gmail.com, jikos@kernel.org,
	benjamin.tissoires@redhat.com, rydberg@bitmath.org
Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
	jiada_wang@mentor.com
Subject: [PATCH v3 34/49] input: atmel_mxt_ts: export GPIO reset line via sysfs
Date: Tue, 17 Sep 2019 18:41:22 +0900	[thread overview]
Message-ID: <20190917094137.18851-1-jiada_wang@mentor.com> (raw)

From: "George G. Davis" <george_davis@mentor.com>

N.B. Modifying the atmel_mxt_ts GPIO reset line during operation will
cause problems with normal driver operation.  This feature is provided
as a diagnostic debug aid.  It does not take into consideration any
pending operations which may be in progress.  Modifying the atmel_mxt_ts
GPIO reset line at any time will inevitably cause the driver to fail.

Signed-off-by: George G. Davis <george_davis@mentor.com>
Signed-off-by: Rajeev Kumar <rajeev_kumar@mentor.com>
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index bdc5088baea8..4670880e52a2 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -4086,6 +4086,19 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		return error;
 	}
 
+	if (data->reset_gpio) {
+		error = gpiod_export(data->reset_gpio, 0);
+		if (error)
+			return error;
+
+		error = gpiod_export_link(&client->dev, "reset",
+					  data->reset_gpio);
+		if (error) {
+			gpiod_unexport(data->reset_gpio);
+			return error;
+		}
+	}
+
 	if (data->suspend_mode == MXT_SUSPEND_REGULATOR) {
 		error = mxt_acquire_irq(data);
 		if (error)
@@ -4118,6 +4131,10 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 err_free_object:
 	mxt_free_input_device(data);
 	mxt_free_object_table(data);
+	if (data->reset_gpio) {
+		sysfs_remove_link(&client->dev.kobj, "reset");
+		gpiod_unexport(data->reset_gpio);
+	}
 	return error;
 }
 
@@ -4127,6 +4144,10 @@ static int mxt_remove(struct i2c_client *client)
 
 	disable_irq(data->irq);
 	sysfs_remove_group(&client->dev.kobj, &mxt_fw_attr_group);
+	if (data->reset_gpio) {
+		sysfs_remove_link(&client->dev.kobj, "reset");
+		gpiod_unexport(data->reset_gpio);
+	}
 	mxt_debug_msg_remove(data);
 	mxt_sysfs_remove(data);
 	mxt_free_input_device(data);
-- 
2.19.2

             reply	other threads:[~2019-09-17  9:41 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-17  9:41 Jiada Wang [this message]
2019-09-17  9:41 ` [PATCH v3 34/49] input: atmel_mxt_ts: export GPIO reset line via sysfs Jiada Wang
2019-09-17  9:41 ` [PATCH v3 35/49] input: atmel_mxt_ts: Add Missing Delay for reset handling of Atmel touch panel controller in detachable displays Jiada Wang
2019-09-17  9:41   ` Jiada Wang
2019-09-17  9:41 ` [PATCH v3 36/49] Input: atmel_mxt_ts: Add support for run self-test routine Jiada Wang
2019-09-17  9:41   ` Jiada Wang
2019-09-17  9:41 ` [PATCH v3 37/49] Input: atmel_mxt_ts: Limit the max bytes transferred in an i2c transaction Jiada Wang
2019-09-17  9:41   ` Jiada Wang
2019-09-17  9:41 ` [PATCH v3 38/49] Input: atmel_mxt_ts: return error from mxt_process_messages_until_invalid() Jiada Wang
2019-09-17  9:41   ` Jiada Wang

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