linux-kernel - [PATCH 5.2 02/37] gpio: pca953x: use pca953x_read_regs instead of regmap_bulk

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Date:   Fri, 13 Sep 2019 14:07:07 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Jander <david@...tonic.nl>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 5.2 02/37] gpio: pca953x: use pca953x_read_regs instead of regmap_bulk_read

From: David Jander <david@...tonic.nl>

commit 438b6c20e6161a1a7542490baa093c86732f77d6 upstream.

The register number needs to be translated for chips with more than 8
ports. This patch fixes a bug causing all chips with more than 8 GPIO pins
to not work correctly.

Fixes: 0f25fda840a9 ("gpio: pca953x: Zap ad-hoc reg_direction cache")
Cc: Cc: <stable@...r.kernel.org>
Signed-off-by: David Jander <david@...tonic.nl>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpio/gpio-pca953x.c |    9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -606,8 +606,7 @@ static void pca953x_irq_bus_sync_unlock(
 	u8 invert_irq_mask[MAX_BANK];
 	u8 reg_direction[MAX_BANK];
 
-	regmap_bulk_read(chip->regmap, chip->regs->direction, reg_direction,
-			 NBANK(chip));
+	pca953x_read_regs(chip, chip->regs->direction, reg_direction);
 
 	if (chip->driver_data & PCA_PCAL) {
 		/* Enable latch on interrupt-enabled inputs */
@@ -710,8 +709,7 @@ static bool pca953x_irq_pending(struct p
 		return false;
 
 	/* Remove output pins from the equation */
-	regmap_bulk_read(chip->regmap, chip->regs->direction, reg_direction,
-			 NBANK(chip));
+	pca953x_read_regs(chip, chip->regs->direction, reg_direction);
 	for (i = 0; i < NBANK(chip); i++)
 		cur_stat[i] &= reg_direction[i];
 
@@ -789,8 +787,7 @@ static int pca953x_irq_setup(struct pca9
 	 * interrupt.  We have to rely on the previous read for
 	 * this purpose.
 	 */
-	regmap_bulk_read(chip->regmap, chip->regs->direction, reg_direction,
-			 NBANK(chip));
+	pca953x_read_regs(chip, chip->regs->direction, reg_direction);
 	for (i = 0; i < NBANK(chip); i++)
 		chip->irq_stat[i] &= reg_direction[i];
 	mutex_init(&chip->irq_lock);