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authorGeert Uytterhoeven <geert+renesas@glider.be>2016-03-14 16:19:18 +0100
committerLinus Walleij <linus.walleij@linaro.org>2016-03-30 10:38:50 +0200
commitd46ab6823963de2165f5a2af7600ce830e990e53 (patch)
tree13b50f2d48b1908a6b514e46728a284ee1ebd69e /drivers
parentdbb763b8ea5d8eb0ce3e45e289969f6f1f418921 (diff)
gpio: 74x164: Implement gpiochip.set_multiple()
This allows to set multiple outputs using a single SPI transfer. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Phil Reid <preid@electromag.com.au> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpio/gpio-74x164.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-74x164.c b/drivers/gpio/gpio-74x164.c
index c81224ff2dca..62291a81c97f 100644
--- a/drivers/gpio/gpio-74x164.c
+++ b/drivers/gpio/gpio-74x164.c
@@ -75,6 +75,29 @@ static void gen_74x164_set_value(struct gpio_chip *gc,
mutex_unlock(&chip->lock);
}
+static void gen_74x164_set_multiple(struct gpio_chip *gc, unsigned long *mask,
+ unsigned long *bits)
+{
+ struct gen_74x164_chip *chip = gpiochip_get_data(gc);
+ unsigned int i, idx, shift;
+ u8 bank, bankmask;
+
+ mutex_lock(&chip->lock);
+ for (i = 0, bank = chip->registers - 1; i < chip->registers;
+ i++, bank--) {
+ idx = i / sizeof(*mask);
+ shift = i % sizeof(*mask) * BITS_PER_BYTE;
+ bankmask = mask[idx] >> shift;
+ if (!bankmask)
+ continue;
+
+ chip->buffer[bank] &= ~bankmask;
+ chip->buffer[bank] |= bankmask & (bits[idx] >> shift);
+ }
+ __gen_74x164_write_config(chip);
+ mutex_unlock(&chip->lock);
+}
+
static int gen_74x164_direction_output(struct gpio_chip *gc,
unsigned offset, int val)
{
@@ -114,6 +137,7 @@ static int gen_74x164_probe(struct spi_device *spi)
chip->gpio_chip.direction_output = gen_74x164_direction_output;
chip->gpio_chip.get = gen_74x164_get_value;
chip->gpio_chip.set = gen_74x164_set_value;
+ chip->gpio_chip.set_multiple = gen_74x164_set_multiple;
chip->gpio_chip.base = -1;
chip->registers = nregs;