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gpio: max732x: add set_multiple function 

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>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Mans Rullgard 2015-01-21 17:17:49 +00:00 committed by Linus Walleij
parent 920dfd8247
commit 161af6cd89
1 changed files with 25 additions and 3 deletions
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28
drivers/gpio/gpio-max732x.c
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@ -212,10 +212,11 @@ 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);
@ -223,7 +224,7 @@ 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)
@ -238,6 +239,26 @@ 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;
@ -621,6 +642,7 @@ 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;