Sorry for slow replies :-(
On Thu, Mar 7, 2013 at 2:17 PM, Ian Lartey <[email protected]> wrote:
> +static int palmas_gpio_read(struct palmas *palmas, unsigned int reg,
> + int gpio, unsigned int *dest)
I don't like "int gpio" here, please use "int offset".
This is not a global GPIO number, it is an offset in the local gpio_chip,
right?
> +{
> + /* registers for second bank are identical and offset by 0x9 */
> + if (gpio > 7)
> + reg += PALMAS_GPIO_DATA_IN2;
> +
> + return palmas_read(palmas, PALMAS_GPIO_BASE, reg, dest);
> +}
> +
> +static int palmas_gpio_write(struct palmas *palmas, unsigned int reg,
> + int gpio, unsigned int data)
> +{
> + /* registers for second bank are identical and offset by 0x9 */
> + if (gpio > 7)
> + reg += PALMAS_GPIO_DATA_IN2;
> +
> + return palmas_write(palmas, PALMAS_GPIO_BASE, reg, data);
> +}
> +
> +static int palmas_gpio_update_bits(struct palmas *palmas, unsigned int reg,
> + int gpio, unsigned int mask, unsigned int data)
> +{
> + /* registers for second bank are identical and offset by 0x9 */
> + if (gpio > 7)
> + reg += PALMAS_GPIO_DATA_IN2;
> +
> + return palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, mask, data);
> +}
> - ret = palmas_read(palmas, PALMAS_GPIO_BASE, PALMAS_GPIO_DATA_IN,
> &val);
> + ret = palmas_gpio_read(palmas, PALMAS_GPIO_DATA_IN, offset, &val);
(Obviously you are passing the offset.)
> + ret = palmas_gpio_write(palmas, PALMAS_GPIO_SET_DATA_OUT,
> + offset, BIT(offset % 8));
(..)
> + ret = palmas_gpio_write(palmas, PALMAS_GPIO_CLEAR_DATA_OUT,
> + offset, BIT(offset % 8));
(...)
> + ret = palmas_gpio_update_bits(palmas, PALMAS_GPIO_DATA_DIR,
> + offset, 1 << (offset % 8), 1 << (offset % 8));
Why aren't you using the BIT() macro here too?
Further: if these functions are always used like this, with offset
and some BIT() or (1 << (offset % 8)) why don't you move that
latter part into the static helper and just pass offset into the
helper?
Yours,
Linus Walleij
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