gpio: adp5588: get value from data out when dir is out

As discussed here: http://ez.analog.com/message/35852,
the 5587 revC and 5588 revB spec sheets contain a mistake
in the GPIO_DAT_STATx register description.

According to R.Shnell at ADI, as well as my own
observations, it should read:
"GPIO data status (shows GPIO state when read for inputs)".

This commit changes the get value function accordingly.

Signed-off-by: Jean-Francois Dagenais <jeff.dagenais@gmail.com>
Acked-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-adp5588.c b/drivers/gpio/gpio-adp5588.c
index 3f190e68f973bfd551e47bb07999137d33569fdf..7d3c8d942ead404e2124e715c9c1d6fa69fbf04e 100644 (file)
--- a/drivers/gpio/gpio-adp5588.c
+++ b/drivers/gpio/gpio-adp5588.c
@@ -67,9 +67,20 @@ static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
 {
        struct adp5588_gpio *dev =
            container_of(chip, struct adp5588_gpio, gpio_chip);
+       unsigned bank = ADP5588_BANK(off);
+       unsigned bit = ADP5588_BIT(off);
+       int val;
 
-       return !!(adp5588_gpio_read(dev->client,
-                 GPIO_DAT_STAT1 + ADP5588_BANK(off)) & ADP5588_BIT(off));
+       mutex_lock(&dev->lock);
+
+       if (dev->dir[bank] & bit)
+               val = dev->dat_out[bank];
+       else
+               val = adp5588_gpio_read(dev->client, GPIO_DAT_STAT1 + bank);
+
+       mutex_unlock(&dev->lock);
+
+       return !!(val & bit);
 }
 
 static void adp5588_gpio_set_value(struct gpio_chip *chip,