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gpio: pca953x: Add set_multiple to allow multiple bits to be set in one write.

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Tested with TCA6408 / TCA6416 devices.

Signed-off-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Phil Reid 2015-12-04 15:52:30 +08:00 committed by Linus Walleij
parent 20d7090ffd
commit b4818afeac
1 changed files with 38 additions and 0 deletions
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38
drivers/gpio/gpio-pca953x.c
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@ -350,6 +350,43 @@ exit:
mutex_unlock(&chip->i2c_lock);
}
static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
unsigned long *mask, unsigned long *bits)
{
struct pca953x_chip *chip = to_pca(gc);
u8 reg_val[MAX_BANK];
int ret, offset = 0;
int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
int bank;
switch (chip->chip_type) {
case PCA953X_TYPE:
offset = PCA953X_OUTPUT;
break;
case PCA957X_TYPE:
offset = PCA957X_OUT;
break;
}
memcpy(reg_val, chip->reg_output, NBANK(chip));
mutex_lock(&chip->i2c_lock);
for(bank=0; bank<NBANK(chip); bank++) {
unsigned bankmask = mask[bank/4] >> ((bank % 4) * 8);
if(bankmask) {
unsigned bankval = bits[bank/4] >> ((bank % 4) * 8);
reg_val[bank] = (reg_val[bank] & ~bankmask) | bankval;
}
}
ret = i2c_smbus_write_i2c_block_data(chip->client, offset << bank_shift, NBANK(chip), reg_val);
if (ret)
goto exit;
memcpy(chip->reg_output, reg_val, NBANK(chip));
exit:
mutex_unlock(&chip->i2c_lock);
}
static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
{
struct gpio_chip *gc;
@ -360,6 +397,7 @@ static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
gc->direction_output = pca953x_gpio_direction_output;
gc->get = pca953x_gpio_get_value;
gc->set = pca953x_gpio_set_value;
gc->set_multiple = pca953x_gpio_set_multiple;
gc->can_sleep = true;
gc->base = chip->gpio_start;