gpio: gpio-mm: Implement get_multiple callback

The Diamond Systems GPIO-MM series of devices contain two 82C55A
devices, which each feature three 8-bit ports of I/O. Since eight input
lines are acquired on a single port input read, the GPIO-MM GPIO driver
may improve multiple input reads by utilizing a get_multiple callback.
This patch implements the gpiomm_gpio_get_multiple function which serves
as the respective get_multiple callback.

Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 47 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-gpio-mm.c b/drivers/gpio/gpio-gpio-mm.c
index 11ade5b288f8..d496cc56c2a2 100644
--- a/drivers/gpio/gpio-gpio-mm.c
+++ b/drivers/gpio/gpio-gpio-mm.c
@@ -14,6 +14,7 @@
  * This driver supports the following Diamond Systems devices: GPIO-MM and
  * GPIO-MM-12.
  */
+#include <linux/bitmap.h>
 #include <linux/bitops.h>
 #include <linux/device.h>
 #include <linux/errno.h>
@@ -171,6 +172,51 @@ static int gpiomm_gpio_get(struct gpio_chip *chip, unsigned int offset)
         return !!(port_state & mask);
 }
 
+static int gpiomm_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
+        unsigned long *bits)
+{
+        struct gpiomm_gpio *const gpiommgpio = gpiochip_get_data(chip);
+        size_t i;
+        const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
+        const unsigned int gpio_reg_size = 8;
+        unsigned int bits_offset;
+        size_t word_index;
+        unsigned int word_offset;
+        unsigned long word_mask;
+        const unsigned long port_mask = GENMASK(gpio_reg_size - 1, 0);
+        unsigned long port_state;
+
+        /* clear bits array to a clean slate */
+        bitmap_zero(bits, chip->ngpio);
+
+        /* get bits are evaluated a gpio port register at a time */
+        for (i = 0; i < ARRAY_SIZE(ports); i++) {
+                /* gpio offset in bits array */
+                bits_offset = i * gpio_reg_size;
+
+                /* word index for bits array */
+                word_index = BIT_WORD(bits_offset);
+
+                /* gpio offset within current word of bits array */
+                word_offset = bits_offset % BITS_PER_LONG;
+
+                /* mask of get bits for current gpio within current word */
+                word_mask = mask[word_index] & (port_mask << word_offset);
+                if (!word_mask) {
+                        /* no get bits in this port so skip to next one */
+                        continue;
+                }
+
+                /* read bits from current gpio port */
+                port_state = inb(gpiommgpio->base + ports[i]);
+
+                /* store acquired bits at respective bits array offset */
+                bits[word_index] |= port_state << word_offset;
+        }
+
+        return 0;
+}
+
 static void gpiomm_gpio_set(struct gpio_chip *chip, unsigned int offset,
         int value)
 {
@@ -268,6 +314,7 @@ static int gpiomm_probe(struct device *dev, unsigned int id)
         gpiommgpio->chip.direction_input = gpiomm_gpio_direction_input;
         gpiommgpio->chip.direction_output = gpiomm_gpio_direction_output;
         gpiommgpio->chip.get = gpiomm_gpio_get;
+        gpiommgpio->chip.get_multiple = gpiomm_gpio_get_multiple;
         gpiommgpio->chip.set = gpiomm_gpio_set;
         gpiommgpio->chip.set_multiple = gpiomm_gpio_set_multiple;
         gpiommgpio->base = base[id];