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gpio: 74x164: Implement gpiochip.set_multiple()

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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>
This commit is contained in:
Geert Uytterhoeven 2016-03-14 16:19:18 +01:00 committed by Linus Walleij
parent dbb763b8ea
commit d46ab68239
1 changed files with 24 additions and 0 deletions
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24
drivers/gpio/gpio-74x164.c
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@ -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;