linux-kernel - [PATCH v5 2/3] Input: adp5588-keys

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Message-Id: <20240703-adp5588_gpio_support-v5-2-49fcead0d390@analog.com>
Date: Wed, 03 Jul 2024 11:58:15 +0100
From: Utsav Agarwal via B4 Relay <devnull+utsav.agarwal.analog.com@...nel.org>
To: Utsav Agarwal <utsav.agarwal@...log.com>, 
 Michael Hennerich <michael.hennerich@...log.com>, 
 Dmitry Torokhov <dmitry.torokhov@...il.com>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Nuno Sá <nuno.sa@...log.com>
Cc: linux-input@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Arturs Artamonovs <arturs.artamonovs@...log.com>, 
 Vasileios Bimpikas <vasileios.bimpikas@...log.com>, 
 Oliver Gaskell <oliver.gaskell@...log.com>
Subject: [PATCH v5 2/3] Input: adp5588-keys - add support for pure gpio

From: Utsav Agarwal <utsav.agarwal@...log.com>

Keypad specific setup is relaxed if no keypad rows/columns are specified,
enabling a purely gpio operation.

Signed-off-by: Utsav Agarwal <utsav.agarwal@...log.com>
---
 drivers/input/keyboard/adp5588-keys.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/input/keyboard/adp5588-keys.c b/drivers/input/keyboard/adp5588-keys.c
index 09bcfc6b9408..691f5790bc81 100644
--- a/drivers/input/keyboard/adp5588-keys.c
+++ b/drivers/input/keyboard/adp5588-keys.c
@@ -188,6 +188,7 @@ struct adp5588_kpad {
 	u32 cols;
 	u32 unlock_keys[2];
 	int nkeys_unlock;
+	bool gpio_only;
 	unsigned short keycode[ADP5588_KEYMAPSIZE];
 	unsigned char gpiomap[ADP5588_MAXGPIO];
 	struct gpio_chip gc;
@@ -632,6 +633,21 @@ static int adp5588_fw_parse(struct adp5588_kpad *kpad)
 	struct i2c_client *client = kpad->client;
 	int ret, i;
 
+	/*
+	 * Check if the device is to be operated purely in GPIO mode. To do
+	 * so, check that no keypad rows or columns have been specified,
+	 * since all GPINS should be configured as GPIO.
+	 */
+	ret = device_property_present(&client->dev,
+			"keypad,num-rows");
+	ret |= device_property_present(&client->dev,
+			"keypad,num-columns");
+	/* If purely GPIO, skip keypad setup */
+	if (!ret) {
+		kpad->gpio_only = true;
+		return 0;
+	}
+
 	ret = matrix_keypad_parse_properties(&client->dev, &kpad->rows,
 					     &kpad->cols);
 	if (ret)
@@ -775,6 +791,11 @@ static int adp5588_probe(struct i2c_client *client)
 	if (error)
 		return error;
 
+	if (kpad->gpio_only) {
+		dev_info(&client->dev, "Rev.%d, started as GPIO only\n", revid);
+		return 0;
+	}
+
 	error = devm_request_threaded_irq(&client->dev, client->irq,
 					  adp5588_hard_irq, adp5588_thread_irq,
 					  IRQF_TRIGGER_FALLING | IRQF_ONESHOT,

-- 
2.34.1