linux-kernel - [PATCH 3/4] net: can: mcp251x: use new GPIO line value setter callbacks

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250610-gpiochip-set-rv-net-v1-3-35668dd1c76f@linaro.org>
Date: Tue, 10 Jun 2025 14:37:59 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Andrew Lunn <andrew@...n.ch>, Vladimir Oltean <olteanv@...il.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, 
 "Chester A. Unal" <chester.a.unal@...nc9.com>, 
 Daniel Golle <daniel@...rotopia.org>, DENG Qingfang <dqfext@...il.com>, 
 Sean Wang <sean.wang@...iatek.com>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Marc Kleine-Budde <mkl@...gutronix.de>, 
 Vincent Mailhol <mailhol.vincent@...adoo.fr>, 
 Heiner Kallweit <hkallweit1@...il.com>, 
 Russell King <linux@...linux.org.uk>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, linux-can@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 3/4] net: can: mcp251x: 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/net/can/spi/mcp251x.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/can/spi/mcp251x.c b/drivers/net/can/spi/mcp251x.c
index ec5c64006a16f703bc816983765584c5f3ac76e8..7545497d14b46c6388f3976c2bf7b9a99e959c1e 100644
--- a/drivers/net/can/spi/mcp251x.c
+++ b/drivers/net/can/spi/mcp251x.c
@@ -530,8 +530,8 @@ static int mcp251x_gpio_get_multiple(struct gpio_chip *chip,
 	return 0;
 }

-static void mcp251x_gpio_set(struct gpio_chip *chip, unsigned int offset,
-			     int value)
+static int mcp251x_gpio_set(struct gpio_chip *chip, unsigned int offset,
+			    int value)
 {
 	struct mcp251x_priv *priv = gpiochip_get_data(chip);
 	u8 mask, val;
@@ -545,9 +545,11 @@ static void mcp251x_gpio_set(struct gpio_chip *chip, unsigned int offset,

 	priv->reg_bfpctrl &= ~mask;
 	priv->reg_bfpctrl |= val;
+
+	return 0;
 }

-static void
+static int
 mcp251x_gpio_set_multiple(struct gpio_chip *chip,
 			  unsigned long *maskp, unsigned long *bitsp)
 {
@@ -561,7 +563,7 @@ mcp251x_gpio_set_multiple(struct gpio_chip *chip,
 	val = FIELD_PREP(BFPCTRL_BFS_MASK, val);

 	if (!mask)
-		return;
+		return 0;

 	mutex_lock(&priv->mcp_lock);
 	mcp251x_write_bits(priv->spi, BFPCTRL, mask, val);
@@ -569,6 +571,8 @@ mcp251x_gpio_set_multiple(struct gpio_chip *chip,

 	priv->reg_bfpctrl &= ~mask;
 	priv->reg_bfpctrl |= val;
+
+	return 0;
 }

 static void mcp251x_gpio_restore(struct spi_device *spi)
@@ -594,8 +598,8 @@ static int mcp251x_gpio_setup(struct mcp251x_priv *priv)
 	gpio->get_direction = mcp251x_gpio_get_direction;
 	gpio->get = mcp251x_gpio_get;
 	gpio->get_multiple = mcp251x_gpio_get_multiple;
-	gpio->set = mcp251x_gpio_set;
-	gpio->set_multiple = mcp251x_gpio_set_multiple;
+	gpio->set_rv = mcp251x_gpio_set;
+	gpio->set_multiple_rv = mcp251x_gpio_set_multiple;
 	gpio->base = -1;
 	gpio->ngpio = ARRAY_SIZE(mcp251x_gpio_names);
 	gpio->names = mcp251x_gpio_names;

-- 
2.48.1