linux-kernel - [PATCH 4/7] iio: adc: ti-ads7950: use new GPIO line value setter callbacks

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Message-Id: <20250407-gpiochip-set-rv-iio-v1-4-8431b003a145@linaro.org>
Date: Mon, 07 Apr 2025 09:18:12 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, 
 Cosmin Tanislav <cosmin.tanislav@...log.com>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-gpio@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 4/7] iio: adc: ti-ads7950: use new GPIO line value setter
 callbacks

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/iio/adc/ti-ads7950.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/adc/ti-ads7950.c b/drivers/iio/adc/ti-ads7950.c
index af28672aa803..0356ccf23fea 100644
--- a/drivers/iio/adc/ti-ads7950.c
+++ b/drivers/iio/adc/ti-ads7950.c
@@ -403,10 +403,11 @@ static const struct iio_info ti_ads7950_info = {
 	.update_scan_mode	= ti_ads7950_update_scan_mode,
 };
 
-static void ti_ads7950_set(struct gpio_chip *chip, unsigned int offset,
-			   int value)
+static int ti_ads7950_set(struct gpio_chip *chip, unsigned int offset,
+			  int value)
 {
 	struct ti_ads7950_state *st = gpiochip_get_data(chip);
+	int ret;
 
 	mutex_lock(&st->slock);
 
@@ -416,9 +417,11 @@ static void ti_ads7950_set(struct gpio_chip *chip, unsigned int offset,
 		st->cmd_settings_bitmask &= ~BIT(offset);
 
 	st->single_tx = TI_ADS7950_MAN_CMD_SETTINGS(st);
-	spi_sync(st->spi, &st->scan_single_msg);
+	ret = spi_sync(st->spi, &st->scan_single_msg);
 
 	mutex_unlock(&st->slock);
+
+	return ret;
 }
 
 static int ti_ads7950_get(struct gpio_chip *chip, unsigned int offset)
@@ -499,7 +502,11 @@ static int ti_ads7950_direction_input(struct gpio_chip *chip,
 static int ti_ads7950_direction_output(struct gpio_chip *chip,
 				       unsigned int offset, int value)
 {
-	ti_ads7950_set(chip, offset, value);
+	int ret;
+
+	ret = ti_ads7950_set(chip, offset, value);
+	if (ret)
+		return ret;
 
 	return _ti_ads7950_set_direction(chip, offset, 0);
 }
@@ -641,7 +648,7 @@ static int ti_ads7950_probe(struct spi_device *spi)
 	st->chip.direction_input = ti_ads7950_direction_input;
 	st->chip.direction_output = ti_ads7950_direction_output;
 	st->chip.get = ti_ads7950_get;
-	st->chip.set = ti_ads7950_set;
+	st->chip.set_rv = ti_ads7950_set;
 
 	ret = gpiochip_add_data(&st->chip, st);
 	if (ret) {

-- 
2.45.2