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regulator: rpi-panel-attiny: use lock guards for the state mutex

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Use mutex lock guards from linux/cleanup.h to simplify the driver code.

Note that ret must be initialized in order to avoid a build warning as
scoped_guard() is implemented as a for loop.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://patch.msgid.link/20250408-gpiochip-set-rv-regulator-v1-3-a18b6154b31a@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Bartosz Golaszewski
2025-04-08 09:36:30 +02:00
committed by Mark Brown
parent 1326e295d6
commit 50faedda12
1 changed files with 13 additions and 22 deletions
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35
drivers/regulator/rpi-panel-attiny-regulator.c
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@@ -6,6 +6,7 @@
*/
#include <linux/backlight.h>
#include <linux/cleanup.h>
#include <linux/err.h>
#include <linux/gpio/driver.h>
#include <linux/i2c.h>
@@ -94,7 +95,7 @@ static int attiny_lcd_power_enable(struct regulator_dev *rdev)
{
struct attiny_lcd *state = rdev_get_drvdata(rdev);
mutex_lock(&state->lock);
guard(mutex)(&state->lock);
/* Ensure bridge, and tp stay in reset */
attiny_set_port_state(state, REG_PORTC, 0);
@@ -115,8 +116,6 @@ static int attiny_lcd_power_enable(struct regulator_dev *rdev)
msleep(80);
mutex_unlock(&state->lock);
return 0;
}
@@ -124,7 +123,7 @@ static int attiny_lcd_power_disable(struct regulator_dev *rdev)
{
struct attiny_lcd *state = rdev_get_drvdata(rdev);
mutex_lock(&state->lock);
guard(mutex)(&state->lock);
regmap_write(rdev->regmap, REG_PWM, 0);
usleep_range(5000, 10000);
@@ -136,8 +135,6 @@ static int attiny_lcd_power_disable(struct regulator_dev *rdev)
attiny_set_port_state(state, REG_PORTC, 0);
msleep(30);
mutex_unlock(&state->lock);
return 0;
}
@@ -145,19 +142,17 @@ static int attiny_lcd_power_is_enabled(struct regulator_dev *rdev)
{
struct attiny_lcd *state = rdev_get_drvdata(rdev);
unsigned int data;
int ret, i;
int ret = 0, i;
mutex_lock(&state->lock);
for (i = 0; i < 10; i++) {
ret = regmap_read(rdev->regmap, REG_PORTC, &data);
if (!ret)
break;
usleep_range(10000, 12000);
scoped_guard(mutex, &state->lock) {
for (i = 0; i < 10; i++) {
ret = regmap_read(rdev->regmap, REG_PORTC, &data);
if (!ret)
break;
usleep_range(10000, 12000);
}
}
mutex_unlock(&state->lock);
if (ret < 0)
return ret;
@@ -190,7 +185,7 @@ static int attiny_update_status(struct backlight_device *bl)
int brightness = backlight_get_brightness(bl);
int ret, i;
mutex_lock(&state->lock);
guard(mutex)(&state->lock);
for (i = 0; i < 10; i++) {
ret = regmap_write(regmap, REG_PWM, brightness);
@@ -198,8 +193,6 @@ static int attiny_update_status(struct backlight_device *bl)
break;
}
mutex_unlock(&state->lock);
return ret;
}
@@ -217,7 +210,7 @@ static void attiny_gpio_set(struct gpio_chip *gc, unsigned int off, int val)
struct attiny_lcd *state = gpiochip_get_data(gc);
u8 last_val;
mutex_lock(&state->lock);
guard(mutex)(&state->lock);
last_val = attiny_get_port_state(state, mappings[off].reg);
if (val)
@@ -239,8 +232,6 @@ static void attiny_gpio_set(struct gpio_chip *gc, unsigned int off, int val)
msleep(100);
}
mutex_unlock(&state->lock);
}
static int attiny_i2c_read(struct i2c_client *client, u8 reg, unsigned int *buf)