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Subject[PATCH] gpio: max732x: add set_multiple function
Date
This adds a set_multiple function to the MAX732x GPIO driver,
allowing for performance gains when using gpiod_set_array().

Signed-off-by: Mans Rullgard <mans@mansr.com>
---
drivers/gpio/gpio-max732x.c | 28 +++++++++++++++++++++++++---
1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-max732x.c b/drivers/gpio/gpio-max732x.c
index f860837..ef7eef8 100644
--- a/drivers/gpio/gpio-max732x.c
+++ b/drivers/gpio/gpio-max732x.c
@@ -210,10 +210,11 @@ static int max732x_gpio_get_value(struct gpio_chip *gc, unsigned off)
return reg_val & (1u << (off & 0x7));
}

-static void max732x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
+static void max732x_gpio_set_mask(struct gpio_chip *gc, unsigned off, int mask,
+ int val)
{
struct max732x_chip *chip;
- uint8_t reg_out, mask = 1u << (off & 0x7);
+ uint8_t reg_out;
int ret;

chip = container_of(gc, struct max732x_chip, gpio_chip);
@@ -221,7 +222,7 @@ static void max732x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
mutex_lock(&chip->lock);

reg_out = (off > 7) ? chip->reg_out[1] : chip->reg_out[0];
- reg_out = (val) ? reg_out | mask : reg_out & ~mask;
+ reg_out = (reg_out & ~mask) | (val & mask);

ret = max732x_writeb(chip, is_group_a(chip, off), reg_out);
if (ret < 0)
@@ -236,6 +237,26 @@ out:
mutex_unlock(&chip->lock);
}

+static void max732x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
+{
+ unsigned base = off & ~0x7;
+ uint8_t mask = 1u << (off & 0x7);
+
+ max732x_gpio_set_mask(gc, base, mask, val << (off & 0x7));
+}
+
+static void max732x_gpio_set_multiple(struct gpio_chip *gc,
+ unsigned long *mask, unsigned long *bits)
+{
+ unsigned mask_lo = mask[0] & 0xff;
+ unsigned mask_hi = (mask[0] >> 8) & 0xff;
+
+ if (mask_lo)
+ max732x_gpio_set_mask(gc, 0, mask_lo, bits[0] & 0xff);
+ if (mask_hi)
+ max732x_gpio_set_mask(gc, 8, mask_hi, (bits[0] >> 8) & 0xff);
+}
+
static int max732x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
{
struct max732x_chip *chip;
@@ -579,6 +600,7 @@ static int max732x_setup_gpio(struct max732x_chip *chip,
if (chip->dir_output) {
gc->direction_output = max732x_gpio_direction_output;
gc->set = max732x_gpio_set_value;
+ gc->set_multiple = max732x_gpio_set_multiple;
}
gc->get = max732x_gpio_get_value;
gc->can_sleep = true;
--
2.0.5


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