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Message-Id: <20230901134041.1165562-5-andriy.shevchenko@linux.intel.com>
Date:   Fri,  1 Sep 2023 16:40:36 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Andy Shevchenko <andy@...nel.org>
Subject: [PATCH v1 05/10] gpio: pca953x: Simplify code with cleanup helpers

Use macros defined in linux/cleanup.h to automate resource lifetime
control in gpio-pca953x.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/gpio/gpio-pca953x.c | 77 ++++++++++++++-----------------------
 1 file changed, 29 insertions(+), 48 deletions(-)

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index 71d87d570a2b..99379ee98749 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -10,6 +10,7 @@
 
 #include <linux/acpi.h>
 #include <linux/bitmap.h>
+#include <linux/cleanup.h>
 #include <linux/gpio/consumer.h>
 #include <linux/gpio/driver.h>
 #include <linux/i2c.h>
@@ -519,12 +520,10 @@ static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
 	struct pca953x_chip *chip = gpiochip_get_data(gc);
 	u8 dirreg = chip->recalc_addr(chip, chip->regs->direction, off);
 	u8 bit = BIT(off % BANK_SZ);
-	int ret;
 
-	mutex_lock(&chip->i2c_lock);
-	ret = regmap_write_bits(chip->regmap, dirreg, bit, bit);
-	mutex_unlock(&chip->i2c_lock);
-	return ret;
+	guard(mutex)(&chip->i2c_lock);
+
+	return regmap_write_bits(chip->regmap, dirreg, bit, bit);
 }
 
 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
@@ -536,17 +535,15 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
 	u8 bit = BIT(off % BANK_SZ);
 	int ret;
 
-	mutex_lock(&chip->i2c_lock);
+	guard(mutex)(&chip->i2c_lock);
+
 	/* set output level */
 	ret = regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
 	if (ret)
-		goto exit;
+		return ret;
 
 	/* then direction */
-	ret = regmap_write_bits(chip->regmap, dirreg, bit, 0);
-exit:
-	mutex_unlock(&chip->i2c_lock);
-	return ret;
+	return regmap_write_bits(chip->regmap, dirreg, bit, 0);
 }
 
 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
@@ -557,9 +554,8 @@ static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
 	u32 reg_val;
 	int ret;
 
-	mutex_lock(&chip->i2c_lock);
-	ret = regmap_read(chip->regmap, inreg, &reg_val);
-	mutex_unlock(&chip->i2c_lock);
+	scoped_guard(mutex, &chip->i2c_lock)
+		ret = regmap_read(chip->regmap, inreg, &reg_val);
 	if (ret < 0)
 		return ret;
 
@@ -572,9 +568,9 @@ static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
 	u8 outreg = chip->recalc_addr(chip, chip->regs->output, off);
 	u8 bit = BIT(off % BANK_SZ);
 
-	mutex_lock(&chip->i2c_lock);
+	guard(mutex)(&chip->i2c_lock);
+
 	regmap_write_bits(chip->regmap, outreg, bit, val ? bit : 0);
-	mutex_unlock(&chip->i2c_lock);
 }
 
 static int pca953x_gpio_get_direction(struct gpio_chip *gc, unsigned off)
@@ -585,9 +581,8 @@ static int pca953x_gpio_get_direction(struct gpio_chip *gc, unsigned off)
 	u32 reg_val;
 	int ret;
 
-	mutex_lock(&chip->i2c_lock);
-	ret = regmap_read(chip->regmap, dirreg, &reg_val);
-	mutex_unlock(&chip->i2c_lock);
+	scoped_guard(mutex, &chip->i2c_lock)
+		ret = regmap_read(chip->regmap, dirreg, &reg_val);
 	if (ret < 0)
 		return ret;
 
@@ -604,9 +599,8 @@ static int pca953x_gpio_get_multiple(struct gpio_chip *gc,
 	DECLARE_BITMAP(reg_val, MAX_LINE);
 	int ret;
 
-	mutex_lock(&chip->i2c_lock);
-	ret = pca953x_read_regs(chip, chip->regs->input, reg_val);
-	mutex_unlock(&chip->i2c_lock);
+	scoped_guard(mutex, &chip->i2c_lock)
+		ret = pca953x_read_regs(chip, chip->regs->input, reg_val);
 	if (ret)
 		return ret;
 
@@ -621,16 +615,15 @@ static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
 	DECLARE_BITMAP(reg_val, MAX_LINE);
 	int ret;
 
-	mutex_lock(&chip->i2c_lock);
+	guard(mutex)(&chip->i2c_lock);
+
 	ret = pca953x_read_regs(chip, chip->regs->output, reg_val);
 	if (ret)
-		goto exit;
+		return;
 
 	bitmap_replace(reg_val, reg_val, bits, mask, gc->ngpio);
 
 	pca953x_write_regs(chip, chip->regs->output, reg_val);
-exit:
-	mutex_unlock(&chip->i2c_lock);
 }
 
 static int pca953x_gpio_set_pull_up_down(struct pca953x_chip *chip,
@@ -638,7 +631,6 @@ static int pca953x_gpio_set_pull_up_down(struct pca953x_chip *chip,
 					 unsigned long config)
 {
 	enum pin_config_param param = pinconf_to_config_param(config);
-
 	u8 pull_en_reg = chip->recalc_addr(chip, PCAL953X_PULL_EN, offset);
 	u8 pull_sel_reg = chip->recalc_addr(chip, PCAL953X_PULL_SEL, offset);
 	u8 bit = BIT(offset % BANK_SZ);
@@ -651,7 +643,7 @@ static int pca953x_gpio_set_pull_up_down(struct pca953x_chip *chip,
 	if (!(chip->driver_data & PCA_PCAL))
 		return -ENOTSUPP;
 
-	mutex_lock(&chip->i2c_lock);
+	guard(mutex)(&chip->i2c_lock);
 
 	/* Configure pull-up/pull-down */
 	if (param == PIN_CONFIG_BIAS_PULL_UP)
@@ -661,17 +653,13 @@ static int pca953x_gpio_set_pull_up_down(struct pca953x_chip *chip,
 	else
 		ret = 0;
 	if (ret)
-		goto exit;
+		return ret;
 
 	/* Disable/Enable pull-up/pull-down */
 	if (param == PIN_CONFIG_BIAS_DISABLE)
-		ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, 0);
+		return regmap_write_bits(chip->regmap, pull_en_reg, bit, 0);
 	else
-		ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, bit);
-
-exit:
-	mutex_unlock(&chip->i2c_lock);
-	return ret;
+		return regmap_write_bits(chip->regmap, pull_en_reg, bit, bit);
 }
 
 static int pca953x_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
@@ -900,10 +888,8 @@ static irqreturn_t pca953x_irq_handler(int irq, void *devid)
 
 	bitmap_zero(pending, MAX_LINE);
 
-	mutex_lock(&chip->i2c_lock);
-	ret = pca953x_irq_pending(chip, pending);
-	mutex_unlock(&chip->i2c_lock);
-
+	scoped_guard(mutex, &chip->i2c_lock)
+		ret = pca953x_irq_pending(chip, pending);
 	if (ret) {
 		ret = 0;
 
@@ -1235,26 +1221,21 @@ static int pca953x_restore_context(struct pca953x_chip *chip)
 {
 	int ret;
 
-	mutex_lock(&chip->i2c_lock);
+	guard(mutex)(&chip->i2c_lock);
 
 	regcache_cache_only(chip->regmap, false);
 	regcache_mark_dirty(chip->regmap);
 	ret = pca953x_regcache_sync(chip);
-	if (ret) {
-		mutex_unlock(&chip->i2c_lock);
+	if (ret)
 		return ret;
-	}
 
-	ret = regcache_sync(chip->regmap);
-	mutex_unlock(&chip->i2c_lock);
-	return ret;
+	return regcache_sync(chip->regmap);
 }
 
 static void pca953x_save_context(struct pca953x_chip *chip)
 {
-	mutex_lock(&chip->i2c_lock);
+	guard(mutex)(&chip->i2c_lock);
 	regcache_cache_only(chip->regmap, true);
-	mutex_unlock(&chip->i2c_lock);
 }
 
 static int pca953x_suspend(struct device *dev)
-- 
2.40.0.1.gaa8946217a0b

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