From 0218d5a8b2a3f4bdbc99523a61406b8c5ab14d39 Mon Sep 17 00:00:00 2001 From: Axel Lin Date: Mon, 13 Apr 2015 15:56:00 +0800 Subject: gpio: bcm-kona: Implement get_direction callback Implement gpio_chip's get_direction() callback, that lets other drivers get particular GPIOs direction using gpiod_get_direction(). Signed-off-by: Axel Lin Reviewed-by: Ray Jui Signed-off-by: Linus Walleij --- drivers/gpio/gpio-bcm-kona.c | 26 ++++++++++++++++---------- 1 file changed, 16 insertions(+), 10 deletions(-) (limited to 'drivers') diff --git a/drivers/gpio/gpio-bcm-kona.c b/drivers/gpio/gpio-bcm-kona.c index b164ce837b43..a6e79225886d 100644 --- a/drivers/gpio/gpio-bcm-kona.c +++ b/drivers/gpio/gpio-bcm-kona.c @@ -122,6 +122,16 @@ static void bcm_kona_gpio_unlock_gpio(struct bcm_kona_gpio *kona_gpio, spin_unlock_irqrestore(&kona_gpio->lock, flags); } +static int bcm_kona_gpio_get_dir(struct gpio_chip *chip, unsigned gpio) +{ + struct bcm_kona_gpio *kona_gpio = to_kona_gpio(chip); + void __iomem *reg_base = kona_gpio->reg_base; + u32 val; + + val = readl(reg_base + GPIO_CONTROL(gpio)) & GPIO_GPCTR0_IOTR_MASK; + return val ? GPIOF_DIR_IN : GPIOF_DIR_OUT; +} + static void bcm_kona_gpio_set(struct gpio_chip *chip, unsigned gpio, int value) { struct bcm_kona_gpio *kona_gpio; @@ -135,12 +145,8 @@ static void bcm_kona_gpio_set(struct gpio_chip *chip, unsigned gpio, int value) reg_base = kona_gpio->reg_base; spin_lock_irqsave(&kona_gpio->lock, flags); - /* determine the GPIO pin direction */ - val = readl(reg_base + GPIO_CONTROL(gpio)); - val &= GPIO_GPCTR0_IOTR_MASK; - /* this function only applies to output pin */ - if (GPIO_GPCTR0_IOTR_CMD_INPUT == val) + if (bcm_kona_gpio_get_dir(chip, gpio) == GPIOF_DIR_IN) goto out; reg_offset = value ? GPIO_OUT_SET(bank_id) : GPIO_OUT_CLEAR(bank_id); @@ -166,13 +172,12 @@ static int bcm_kona_gpio_get(struct gpio_chip *chip, unsigned gpio) reg_base = kona_gpio->reg_base; spin_lock_irqsave(&kona_gpio->lock, flags); - /* determine the GPIO pin direction */ - val = readl(reg_base + GPIO_CONTROL(gpio)); - val &= GPIO_GPCTR0_IOTR_MASK; + if (bcm_kona_gpio_get_dir(chip, gpio) == GPIOF_DIR_IN) + reg_offset = GPIO_IN_STATUS(bank_id); + else + reg_offset = GPIO_OUT_STATUS(bank_id); /* read the GPIO bank status */ - reg_offset = (GPIO_GPCTR0_IOTR_CMD_INPUT == val) ? - GPIO_IN_STATUS(bank_id) : GPIO_OUT_STATUS(bank_id); val = readl(reg_base + reg_offset); spin_unlock_irqrestore(&kona_gpio->lock, flags); @@ -310,6 +315,7 @@ static struct gpio_chip template_chip = { .owner = THIS_MODULE, .request = bcm_kona_gpio_request, .free = bcm_kona_gpio_free, + .get_direction = bcm_kona_gpio_get_dir, .direction_input = bcm_kona_gpio_direction_input, .get = bcm_kona_gpio_get, .direction_output = bcm_kona_gpio_direction_output, -- cgit v1.2.3-58-ga151