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    Subject[PATCH v11 06/11] gpio: ws16c48: Utilize for_each_set_clump8 macro
    Date
    Replace verbose implementation in get_multiple/set_multiple callbacks
    with for_each_set_clump8 macro to simplify code and improve clarity.

    Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
    Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
    ---
    drivers/gpio/gpio-ws16c48.c | 72 +++++++++++--------------------------
    1 file changed, 20 insertions(+), 52 deletions(-)

    diff --git a/drivers/gpio/gpio-ws16c48.c b/drivers/gpio/gpio-ws16c48.c
    index 5cf3697bfb15..1d071a3d3e81 100644
    --- a/drivers/gpio/gpio-ws16c48.c
    +++ b/drivers/gpio/gpio-ws16c48.c
    @@ -134,42 +134,19 @@ static int ws16c48_gpio_get_multiple(struct gpio_chip *chip,
    unsigned long *mask, unsigned long *bits)
    {
    struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
    - const unsigned int gpio_reg_size = 8;
    - size_t i;
    - const size_t num_ports = chip->ngpio / gpio_reg_size;
    - unsigned int bits_offset;
    - size_t word_index;
    - unsigned int word_offset;
    - unsigned long word_mask;
    - const unsigned long port_mask = GENMASK(gpio_reg_size - 1, 0);
    + unsigned int offset;
    + unsigned long gpio_mask;
    + unsigned int port_addr;
    unsigned long port_state;

    /* clear bits array to a clean slate */
    bitmap_zero(bits, chip->ngpio);

    - /* get bits are evaluated a gpio port register at a time */
    - for (i = 0; i < num_ports; i++) {
    - /* gpio offset in bits array */
    - bits_offset = i * gpio_reg_size;
    + for_each_set_clump8(offset, gpio_mask, mask, chip->ngpio) {
    + port_addr = ws16c48gpio->base + offset / 8;
    + port_state = inb(port_addr) & gpio_mask;

    - /* word index for bits array */
    - word_index = BIT_WORD(bits_offset);
    -
    - /* gpio offset within current word of bits array */
    - word_offset = bits_offset % BITS_PER_LONG;
    -
    - /* mask of get bits for current gpio within current word */
    - word_mask = mask[word_index] & (port_mask << word_offset);
    - if (!word_mask) {
    - /* no get bits in this port so skip to next one */
    - continue;
    - }
    -
    - /* read bits from current gpio port */
    - port_state = inb(ws16c48gpio->base + i);
    -
    - /* store acquired bits at respective bits array offset */
    - bits[word_index] |= (port_state << word_offset) & word_mask;
    + bitmap_set_value8(bits, chip->ngpio, port_state, offset);
    }

    return 0;
    @@ -203,39 +180,30 @@ static void ws16c48_gpio_set_multiple(struct gpio_chip *chip,
    unsigned long *mask, unsigned long *bits)
    {
    struct ws16c48_gpio *const ws16c48gpio = gpiochip_get_data(chip);
    - unsigned int i;
    - const unsigned int gpio_reg_size = 8;
    - unsigned int port;
    - unsigned int iomask;
    + unsigned int offset;
    + unsigned long gpio_mask;
    + size_t index;
    + unsigned int port_addr;
    unsigned int bitmask;
    unsigned long flags;

    - /* set bits are evaluated a gpio register size at a time */
    - for (i = 0; i < chip->ngpio; i += gpio_reg_size) {
    - /* no more set bits in this mask word; skip to the next word */
    - if (!mask[BIT_WORD(i)]) {
    - i = (BIT_WORD(i) + 1) * BITS_PER_LONG - gpio_reg_size;
    - continue;
    - }
    -
    - port = i / gpio_reg_size;
    + for_each_set_clump8(offset, gpio_mask, mask, chip->ngpio) {
    + index = offset / 8;
    + port_addr = ws16c48gpio->base + index;

    /* mask out GPIO configured for input */
    - iomask = mask[BIT_WORD(i)] & ~ws16c48gpio->io_state[port];
    - bitmask = iomask & bits[BIT_WORD(i)];
    + gpio_mask &= ~ws16c48gpio->io_state[index];
    + bitmask = bitmap_get_value8(bits, chip->ngpio, offset) &
    + gpio_mask;

    raw_spin_lock_irqsave(&ws16c48gpio->lock, flags);

    /* update output state data and set device gpio register */
    - ws16c48gpio->out_state[port] &= ~iomask;
    - ws16c48gpio->out_state[port] |= bitmask;
    - outb(ws16c48gpio->out_state[port], ws16c48gpio->base + port);
    + ws16c48gpio->out_state[index] &= ~gpio_mask;
    + ws16c48gpio->out_state[index] |= bitmask;
    + outb(ws16c48gpio->out_state[index], port_addr);

    raw_spin_unlock_irqrestore(&ws16c48gpio->lock, flags);
    -
    - /* prepare for next gpio register set */
    - mask[BIT_WORD(i)] >>= gpio_reg_size;
    - bits[BIT_WORD(i)] >>= gpio_reg_size;
    }
    }

    --
    2.21.0
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