gpio: 104-dio-48e: utilize for_each_set_clump8 macro

Replace verbose implementation in get_multiple/set_multiple callbacks
with for_each_set_clump8 macro to simplify code and improve clarity.

Link: http://lkml.kernel.org/r/08b9c9a3e75ef1ab0d172223d10a1661f2b43fe2.1570641097.git.vilhelm.gray@gmail.com
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Mathias Duckeck <m.duckeck@kunbus.de>
Cc: Morten Hein Tiljeset <morten.tiljeset@prevas.dk>
Cc: Phil Reid <preid@electromag.com.au>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Sean Nyekjaer <sean.nyekjaer@prevas.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/gpio/gpio-104-dio-48e.c b/drivers/gpio/gpio-104-dio-48e.c
index 400c09b905f8ad2a65569368ece34747563a8283..1f7d9bbec0fcbb5c7b5985ad4b2967d66b668263 100644 (file)
--- a/drivers/gpio/gpio-104-dio-48e.c
+++ b/drivers/gpio/gpio-104-dio-48e.c
@@ -178,46 +178,25 @@ static int dio48e_gpio_get(struct gpio_chip *chip, unsigned offset)
        return !!(port_state & mask);
 }
 
+static const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
+
 static int dio48e_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
        unsigned long *bits)
 {
        struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
-       size_t i;
-       static const size_t ports[] = { 0, 1, 2, 4, 5, 6 };
-       const unsigned int gpio_reg_size = 8;
-       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 long 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 < ARRAY_SIZE(ports); i++) {
-               /* gpio offset in bits array */
-               bits_offset = i * gpio_reg_size;
-
-               /* 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(dio48egpio->base + ports[i]);
+       for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
+               port_addr = dio48egpio->base + ports[offset / 8];
+               port_state = inb(port_addr) & gpio_mask;
 
-               /* store acquired bits at respective bits array offset */
-               bits[word_index] |= (port_state << word_offset) & word_mask;
+               bitmap_set_value8(bits, port_state, offset);
        }
 
        return 0;
@@ -247,37 +226,27 @@ static void dio48e_gpio_set_multiple(struct gpio_chip *chip,
        unsigned long *mask, unsigned long *bits)
 {
        struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
-       unsigned int i;
-       const unsigned int gpio_reg_size = 8;
-       unsigned int port;
-       unsigned int out_port;
-       unsigned int bitmask;
+       unsigned long offset;
+       unsigned long gpio_mask;
+       size_t index;
+       unsigned int port_addr;
+       unsigned long 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;
-               }
+       for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
+               index = offset / 8;
+               port_addr = dio48egpio->base + ports[index];
 
-               port = i / gpio_reg_size;
-               out_port = (port > 2) ? port + 1 : port;
-               bitmask = mask[BIT_WORD(i)] & bits[BIT_WORD(i)];
+               bitmask = bitmap_get_value8(bits, offset) & gpio_mask;
 
                raw_spin_lock_irqsave(&dio48egpio->lock, flags);
 
                /* update output state data and set device gpio register */
-               dio48egpio->out_state[port] &= ~mask[BIT_WORD(i)];
-               dio48egpio->out_state[port] |= bitmask;
-               outb(dio48egpio->out_state[port], dio48egpio->base + out_port);
+               dio48egpio->out_state[index] &= ~gpio_mask;
+               dio48egpio->out_state[index] |= bitmask;
+               outb(dio48egpio->out_state[index], port_addr);
 
                raw_spin_unlock_irqrestore(&dio48egpio->lock, flags);
-
-               /* prepare for next gpio register set */
-               mask[BIT_WORD(i)] >>= gpio_reg_size;
-               bits[BIT_WORD(i)] >>= gpio_reg_size;
        }
 }