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gpio: max3191x: utilize the for_each_set_clump8 macro 

Replace verbose implementation in get_multiple callback with
for_each_set_clump8 macro to simplify code and improve clarity.

Link: http://lkml.kernel.org/r/c2b1ed62caf6fce6e5681809a50c05ce6acdf2a6.1570641097.git.vilhelm.gray@gmail.com
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Mathias Duckeck <m.duckeck@kunbus.de>
Cc: Lukas Wunner <lukas@wunner.de>
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: Linus Walleij <linus.walleij@linaro.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
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>
This commit is contained in:
William Breathitt Gray 2019-12-04 16:51:40 -08:00 committed by Linus Torvalds
parent 608bd5fda6
commit d077c78b45
1 changed files with 10 additions and 9 deletions
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19
drivers/gpio/gpio-max3191x.c
View File

@ -31,6 +31,7 @@
*/
#include <linux/bitmap.h>
#include <linux/bitops.h>
#include <linux/crc8.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/driver.h>
@ -232,16 +233,20 @@ static int max3191x_get_multiple(struct gpio_chip *gpio, unsigned long *mask,
unsigned long *bits)
{
struct max3191x_chip *max3191x = gpiochip_get_data(gpio);
int ret, bit = 0, wordlen = max3191x_wordlen(max3191x);
const unsigned int wordlen = max3191x_wordlen(max3191x);
int ret;
unsigned long bit;
unsigned long gpio_mask;
unsigned long in;
mutex_lock(&max3191x->lock);
ret = max3191x_readout_locked(max3191x);
if (ret)
goto out_unlock;
while ((bit = find_next_bit(mask, gpio->ngpio, bit)) != gpio->ngpio) {
bitmap_zero(bits, gpio->ngpio);
for_each_set_clump8(bit, gpio_mask, mask, gpio->ngpio) {
unsigned int chipnum = bit / MAX3191X_NGPIO;
unsigned long in, shift, index;
if (max3191x_chip_is_faulting(max3191x, chipnum)) {
ret = -EIO;
@ -249,12 +254,8 @@ static int max3191x_get_multiple(struct gpio_chip *gpio, unsigned long *mask,
}
in = ((u8 *)max3191x->xfer.rx_buf)[chipnum * wordlen];
shift = round_down(bit % BITS_PER_LONG, MAX3191X_NGPIO);
index = bit / BITS_PER_LONG;
bits[index] &= ~(mask[index] & (0xff << shift));
bits[index] |= mask[index] & (in << shift); /* copy bits */
bit = (chipnum + 1) * MAX3191X_NGPIO; /* go to next chip */
in &= gpio_mask;
bitmap_set_value8(bits, in, bit);
}
out_unlock: