iio: stx104: Add GPIO set_multiple callback function support

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>

diff --git a/drivers/iio/adc/stx104.c b/drivers/iio/adc/stx104.c
index 40c05df..be2de48 100644 (file)
--- a/drivers/iio/adc/stx104.c
+++ b/drivers/iio/adc/stx104.c
@@ -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;