diff options
| author | William Breathitt Gray <vilhelm.gray@gmail.com> | 2017-01-19 10:05:37 -0500 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2017-01-26 10:55:48 +0100 |
| commit | 9d7ae8127ff9eea84375dd8d962ce776a3734119 (patch) | |
| tree | 228201dd702fba2c61f47a5ded69dc2d785cf384 /drivers/gpio | |
| parent | be18320222811fcb4fea752b57e2b4fb504db3b4 (diff) | |
| download | linux-9d7ae8127ff9eea84375dd8d962ce776a3734119.tar.bz2 | |
gpio: 104-idio-16: Add set_multiple callback function support
The ACCES 104-IDIO-16 series provides registers where 8 lines of GPIO
may be set at a time. This patch add support for the set_multiple
callback function, thus allowing multiple GPIO output lines to be set
more efficiently in groups.
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-104-idio-16.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-104-idio-16.c b/drivers/gpio/gpio-104-idio-16.c index 6787b8fcf0d8..a57900fd0dc7 100644 --- a/drivers/gpio/gpio-104-idio-16.c +++ b/drivers/gpio/gpio-104-idio-16.c @@ -116,6 +116,25 @@ static void idio_16_gpio_set(struct gpio_chip *chip, unsigned offset, int value) spin_unlock_irqrestore(&idio16gpio->lock, flags); } +static void idio_16_gpio_set_multiple(struct gpio_chip *chip, + unsigned long *mask, unsigned long *bits) +{ + struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip); + unsigned long flags; + + spin_lock_irqsave(&idio16gpio->lock, flags); + + idio16gpio->out_state &= ~*mask; + idio16gpio->out_state |= *mask & *bits; + + if (*mask & 0xFF) + outb(idio16gpio->out_state, idio16gpio->base); + if ((*mask >> 8) & 0xFF) + outb(idio16gpio->out_state >> 8, idio16gpio->base + 4); + + spin_unlock_irqrestore(&idio16gpio->lock, flags); +} + static void idio_16_irq_ack(struct irq_data *data) { } @@ -219,6 +238,7 @@ static int idio_16_probe(struct device *dev, unsigned int id) idio16gpio->chip.direction_output = idio_16_gpio_direction_output; idio16gpio->chip.get = idio_16_gpio_get; idio16gpio->chip.set = idio_16_gpio_set; + idio16gpio->chip.set_multiple = idio_16_gpio_set_multiple; idio16gpio->base = base[id]; idio16gpio->irq = irq[id]; idio16gpio->out_state = 0xFFFF; |