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gpiolib: use gpio_chips list in sysfs ops

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This makes the code both simpler and faster compared to parsing the GPIO
number space.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Alexandre Courbot 2013-02-03 01:29:27 +09:00 committed by Grant Likely
parent 125eef96f6
commit cb1650d4e0
1 changed files with 10 additions and 27 deletions
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37
drivers/gpio/gpiolib.c
View file

@ -1890,45 +1890,28 @@ static void gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip)
static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos)
{
struct gpio_chip *chip = NULL;
unsigned int gpio;
void *ret = NULL;
loff_t index = 0;
loff_t index = *pos;
/* REVISIT this isn't locked against gpio_chip removal ... */
for (gpio = 0; gpio_is_valid(gpio); gpio++) {
if (gpio_desc[gpio].chip == chip)
continue;
chip = gpio_desc[gpio].chip;
if (!chip)
continue;
if (index++ >= *pos) {
ret = chip;
break;
}
}
s->private = "";
return ret;
list_for_each_entry(chip, &gpio_chips, list)
if (index-- == 0)
return chip;
return NULL;
}
static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos)
{
struct gpio_chip *chip = v;
unsigned int gpio;
void *ret = NULL;
/* skip GPIOs provided by the current chip */
for (gpio = chip->base + chip->ngpio; gpio_is_valid(gpio); gpio++) {
chip = gpio_desc[gpio].chip;
if (chip) {
ret = chip;
break;
}
}
if (list_is_last(&chip->list, &gpio_chips))
ret = NULL;
else
ret = list_entry(chip->list.next, struct gpio_chip, list);
s->private = "\n";
++*pos;