[PATCH 1/3] Input: matrix_keypad - avoid repeatedly converting GPIO to IRQ

[Dmitry Torokhov]

gpio_to_irq() is getting more expensive and may require sleeping.
Convert row GPIOs to interrupt numbers once in probe() and use
this information when the driver needs to enable or disable given
interrupt line.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
 drivers/input/keyboard/matrix_keypad.c | 48 ++++++++++++++------------
 1 file changed, 25 insertions(+), 23 deletions(-)

diff --git a/drivers/input/keyboard/matrix_keypad.c b/drivers/input/keyboard/matrix_keypad.c
index 50fa764c82d2..1cd1ffb80401 100644
--- a/drivers/input/keyboard/matrix_keypad.c
+++ b/drivers/input/keyboard/matrix_keypad.c
@@ -27,6 +27,7 @@ struct matrix_keypad {
 	const struct matrix_keypad_platform_data *pdata;
 	struct input_dev *input_dev;
 	unsigned int row_shift;
+	unsigned int row_irqs[MATRIX_MAX_ROWS];
 
 	DECLARE_BITMAP(disabled_gpios, MATRIX_MAX_ROWS);
 
@@ -92,7 +93,7 @@ static void enable_row_irqs(struct matrix_keypad *keypad)
 		enable_irq(pdata->clustered_irq);
 	else {
 		for (i = 0; i < pdata->num_row_gpios; i++)
-			enable_irq(gpio_to_irq(pdata->row_gpios[i]));
+			enable_irq(keypad->row_irqs[i]);
 	}
 }
 
@@ -105,7 +106,7 @@ static void disable_row_irqs(struct matrix_keypad *keypad)
 		disable_irq_nosync(pdata->clustered_irq);
 	else {
 		for (i = 0; i < pdata->num_row_gpios; i++)
-			disable_irq_nosync(gpio_to_irq(pdata->row_gpios[i]));
+			disable_irq_nosync(keypad->row_irqs[i]);
 	}
 }
 
@@ -233,7 +234,6 @@ static void matrix_keypad_stop(struct input_dev *dev)
 static void matrix_keypad_enable_wakeup(struct matrix_keypad *keypad)
 {
 	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
-	unsigned int gpio;
 	int i;
 
 	if (pdata->clustered_irq > 0) {
@@ -241,21 +241,16 @@ static void matrix_keypad_enable_wakeup(struct matrix_keypad *keypad)
 			keypad->gpio_all_disabled = true;
 	} else {
 
-		for (i = 0; i < pdata->num_row_gpios; i++) {
-			if (!test_bit(i, keypad->disabled_gpios)) {
-				gpio = pdata->row_gpios[i];
-
-				if (enable_irq_wake(gpio_to_irq(gpio)) == 0)
+		for (i = 0; i < pdata->num_row_gpios; i++)
+			if (!test_bit(i, keypad->disabled_gpios))
+				if (enable_irq_wake(keypad->row_irqs[i]) == 0)
 					__set_bit(i, keypad->disabled_gpios);
-			}
-		}
 	}
 }
 
 static void matrix_keypad_disable_wakeup(struct matrix_keypad *keypad)
 {
 	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
-	unsigned int gpio;
 	int i;
 
 	if (pdata->clustered_irq > 0) {
@@ -264,12 +259,9 @@ static void matrix_keypad_disable_wakeup(struct matrix_keypad *keypad)
 			keypad->gpio_all_disabled = false;
 		}
 	} else {
-		for (i = 0; i < pdata->num_row_gpios; i++) {
-			if (test_and_clear_bit(i, keypad->disabled_gpios)) {
-				gpio = pdata->row_gpios[i];
-				disable_irq_wake(gpio_to_irq(gpio));
-			}
-		}
+		for (i = 0; i < pdata->num_row_gpios; i++)
+			if (test_and_clear_bit(i, keypad->disabled_gpios))
+				disable_irq_wake(keypad->row_irqs[i]);
 	}
 }
 
@@ -306,7 +298,7 @@ static int matrix_keypad_init_gpio(struct platform_device *pdev,
 				   struct matrix_keypad *keypad)
 {
 	const struct matrix_keypad_platform_data *pdata = keypad->pdata;
-	int i, err;
+	int i, irq, err;
 
 	/* initialized strobe lines as outputs, activated */
 	for (i = 0; i < pdata->num_col_gpios; i++) {
@@ -345,11 +337,19 @@ static int matrix_keypad_init_gpio(struct platform_device *pdev,
 		}
 	} else {
 		for (i = 0; i < pdata->num_row_gpios; i++) {
-			err = request_any_context_irq(
-					gpio_to_irq(pdata->row_gpios[i]),
+			irq = gpio_to_irq(pdata->row_gpios[i]);
+			if (irq < 0) {
+				err = irq;
+				dev_err(&pdev->dev,
+					"Unable to convert GPIO line %i to irq: %d\n",
+					pdata->row_gpios[i], err);
+				goto err_free_irqs;
+			}
+
+			err = request_any_context_irq(irq,
 					matrix_keypad_interrupt,
 					IRQF_TRIGGER_RISING |
-					IRQF_TRIGGER_FALLING,
+						IRQF_TRIGGER_FALLING,
 					"matrix-keypad", keypad);
 			if (err < 0) {
 				dev_err(&pdev->dev,
@@ -357,6 +357,8 @@ static int matrix_keypad_init_gpio(struct platform_device *pdev,
 					pdata->row_gpios[i]);
 				goto err_free_irqs;
 			}
+
+			keypad->row_irqs[i] = irq;
 		}
 	}
 
@@ -366,7 +368,7 @@ static int matrix_keypad_init_gpio(struct platform_device *pdev,
 
 err_free_irqs:
 	while (--i >= 0)
-		free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad);
+		free_irq(keypad->row_irqs[i], keypad);
 	i = pdata->num_row_gpios;
 err_free_rows:
 	while (--i >= 0)
@@ -388,7 +390,7 @@ static void matrix_keypad_free_gpio(struct matrix_keypad *keypad)
 		free_irq(pdata->clustered_irq, keypad);
 	} else {
 		for (i = 0; i < pdata->num_row_gpios; i++)
-			free_irq(gpio_to_irq(pdata->row_gpios[i]), keypad);
+			free_irq(keypad->row_irqs[i], keypad);
 	}
 
 	for (i = 0; i < pdata->num_row_gpios; i++)
-- 
2.43.0.429.g432eaa2c6b-goog