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iio: stx104: Add GPIO set_multiple callback function support

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The Apex Embedded Systems STX104 series provides a digital output
register where 4 lines may be set at a time. This patch add support for
the set_multiple callback function, thus allowing multiple digital
output lines to be set more efficiently in groups.

Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
William Breathitt Gray 2017-01-19 10:06:16 -05:00 committed by Jonathan Cameron
parent 1c74a6da1e
commit bfe7288e0d
1 changed files with 23 additions and 0 deletions
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23
drivers/iio/adc/stx104.c
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@ -261,6 +261,28 @@ static const char *stx104_names[STX104_NGPIO] = {
"DIN0", "DIN1", "DIN2", "DIN3", "DOUT0", "DOUT1", "DOUT2", "DOUT3"
};
static void stx104_gpio_set_multiple(struct gpio_chip *chip,
unsigned long *mask, unsigned long *bits)
{
struct stx104_gpio *const stx104gpio = gpiochip_get_data(chip);
unsigned long flags;
/* verify masked GPIO are output */
if (!(*mask & 0xF0))
return;
*mask >>= 4;
*bits >>= 4;
spin_lock_irqsave(&stx104gpio->lock, flags);
stx104gpio->out_state &= ~*mask;
stx104gpio->out_state |= *mask & *bits;
outb(stx104gpio->out_state, stx104gpio->base);
spin_unlock_irqrestore(&stx104gpio->lock, flags);
}
static int stx104_probe(struct device *dev, unsigned int id)
{
struct iio_dev *indio_dev;
@ -321,6 +343,7 @@ static int stx104_probe(struct device *dev, unsigned int id)
stx104gpio->chip.direction_output = stx104_gpio_direction_output;
stx104gpio->chip.get = stx104_gpio_get;
stx104gpio->chip.set = stx104_gpio_set;
stx104gpio->chip.set_multiple = stx104_gpio_set_multiple;
stx104gpio->base = base[id] + 3;
stx104gpio->out_state = 0x0;