+static inline int h1940_gpiolib_to_latch(int offset)
+{
+ return 1 << (offset + 16);
+}
+
+static void h1940_gpiolib_latch_set(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ int latch_bit = h1940_gpiolib_to_latch(offset);
+
+ h1940_latch_control(value ? 0 : latch_bit,
+ value ? latch_bit : 0);
+}
+
+static int h1940_gpiolib_latch_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ h1940_gpiolib_latch_set(chip, offset, value);
+ return 0;
+}
+
+static int h1940_gpiolib_latch_get(struct gpio_chip *chip,
+ unsigned offset)
+{
+ return (latch_state >> (offset + 16)) & 1;
+}
+
+struct gpio_chip h1940_latch_gpiochip = {
+ .base = H1940_LATCH_GPIO(0),
+ .owner = THIS_MODULE,
+ .label = "H1940_LATCH",
+ .ngpio = 16,
+ .direction_output = h1940_gpiolib_latch_output,
+ .set = h1940_gpiolib_latch_set,
+ .get = h1940_gpiolib_latch_get,
+};