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gpio: ich: Use BIT() macro

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Using BIT() makes (1 << foo) constructions easier to read, and
also account for common mistakes where bit 31 is not working
because of numbers being interpreted as negative unless
specified as unsigned.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2018-03-06 08:56:06 +01:00
parent 3f4290d4dc
commit 7a8fd1f5cc
1 changed files with 9 additions and 8 deletions
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17
drivers/gpio/gpio-ich.c
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@ -26,6 +26,7 @@
#include <linux/gpio/driver.h>
#include <linux/platform_device.h>
#include <linux/mfd/lpc_ich.h>
#include <linux/bitops.h>
#define DRV_NAME "gpio_ich"
@ -131,9 +132,9 @@ static int ichx_write_bit(int reg, unsigned nr, int val, int verify)
ichx_priv.gpio_base);
if (val)
data |= 1 << bit;
data |= BIT(bit);
else
data &= ~(1 << bit);
data &= ~BIT(bit);
ICHX_WRITE(data, ichx_priv.desc->regs[reg][reg_nr],
ichx_priv.gpio_base);
if (reg == GPIO_LVL && ichx_priv.desc->use_outlvl_cache)
@ -166,12 +167,12 @@ static int ichx_read_bit(int reg, unsigned nr)
spin_unlock_irqrestore(&ichx_priv.lock, flags);
return data & (1 << bit) ? 1 : 0;
return !!(data & BIT(bit));
}
static bool ichx_gpio_check_available(struct gpio_chip *gpio, unsigned nr)
{
return !!(ichx_priv.use_gpio & (1 << (nr / 32)));
return !!(ichx_priv.use_gpio & BIT(nr / 32));
}
static int ichx_gpio_get_direction(struct gpio_chip *gpio, unsigned nr)
@ -232,12 +233,12 @@ static int ich6_gpio_get(struct gpio_chip *chip, unsigned nr)
spin_lock_irqsave(&ichx_priv.lock, flags);
/* GPI 0 - 15 are latched, write 1 to clear*/
ICHX_WRITE(1 << (16 + nr), 0, ichx_priv.pm_base);
ICHX_WRITE(BIT(16 + nr), 0, ichx_priv.pm_base);
data = ICHX_READ(0, ichx_priv.pm_base);
spin_unlock_irqrestore(&ichx_priv.lock, flags);
return (data >> 16) & (1 << nr) ? 1 : 0;
return !!((data >> 16) & BIT(nr));
} else {
return ichx_gpio_get(chip, nr);
}
@ -254,7 +255,7 @@ static int ichx_gpio_request(struct gpio_chip *chip, unsigned nr)
* the chipset's USE value can be trusted for this specific bit.
* If it can't be trusted, assume that the pin can be used as a GPIO.
*/
if (ichx_priv.desc->use_sel_ignore[nr / 32] & (1 << (nr & 0x1f)))
if (ichx_priv.desc->use_sel_ignore[nr / 32] & BIT(nr & 0x1f))
return 0;
return ichx_read_bit(GPIO_USE_SEL, nr) ? 0 : -ENODEV;
@ -394,7 +395,7 @@ static int ichx_gpio_request_regions(struct device *dev,
return -ENODEV;
for (i = 0; i < ARRAY_SIZE(ichx_priv.desc->regs[0]); i++) {
if (!(use_gpio & (1 << i)))
if (!(use_gpio & BIT(i)))
continue;
if (!devm_request_region(dev,
res_base->start + ichx_priv.desc->regs[0][i],