diff options
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-omap.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c index 5d6a5744352f..f8c550de6c72 100644 --- a/drivers/gpio/gpio-omap.c +++ b/drivers/gpio/gpio-omap.c @@ -208,9 +208,11 @@ static inline void omap_gpio_dbck_disable(struct gpio_bank *bank) * OMAP's debounce time is in 31us steps * <debounce time> = (GPIO_DEBOUNCINGTIME[7:0].DEBOUNCETIME + 1) x 31 * so we need to convert and round up to the closest unit. + * + * Return: 0 on success, negative error otherwise. */ -static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset, - unsigned debounce) +static int omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset, + unsigned debounce) { void __iomem *reg; u32 val; @@ -218,11 +220,12 @@ static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset, bool enable = !!debounce; if (!bank->dbck_flag) - return; + return -ENOTSUPP; if (enable) { debounce = DIV_ROUND_UP(debounce, 31) - 1; - debounce &= OMAP4_GPIO_DEBOUNCINGTIME_MASK; + if ((debounce & OMAP4_GPIO_DEBOUNCINGTIME_MASK) != debounce) + return -EINVAL; } l = BIT(offset); @@ -255,6 +258,8 @@ static void omap2_set_gpio_debounce(struct gpio_bank *bank, unsigned offset, bank->context.debounce = debounce; bank->context.debounce_en = val; } + + return 0; } /** @@ -964,14 +969,20 @@ static int omap_gpio_debounce(struct gpio_chip *chip, unsigned offset, { struct gpio_bank *bank; unsigned long flags; + int ret; bank = gpiochip_get_data(chip); raw_spin_lock_irqsave(&bank->lock, flags); - omap2_set_gpio_debounce(bank, offset, debounce); + ret = omap2_set_gpio_debounce(bank, offset, debounce); raw_spin_unlock_irqrestore(&bank->lock, flags); - return 0; + if (ret) + dev_info(chip->parent, + "Could not set line %u debounce to %u microseconds (%d)", + offset, debounce, ret); + + return ret; } static int omap_gpio_set_config(struct gpio_chip *chip, unsigned offset, |