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lib: utils/gpio: respect flag GPIO_FLAG_ACTIVE_LOW

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"gpio-poweroff" and "gpio-restart" always set gpio to high to
active the function, but some chips need a low signal to active.
Fortunately, it can be achieved by setting GPIO_FLAG_ACTIVE_LOW
for the gpio. Implement this flag support for the gpio library
so the gpio reset can function well.

Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Inochi Amaoto
2024-05-23 13:07:45 +08:00
committed by Anup Patel
parent ae5ef1848d
commit d962db2807
1 changed files with 13 additions and 1 deletions
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14
lib/utils/gpio/gpio.c
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@@ -73,17 +73,26 @@ int gpio_direction_output(struct gpio_pin *gp, int value)
if (!gp->chip->direction_output) if (!gp->chip->direction_output)
return SBI_ENOSYS; return SBI_ENOSYS;
if (gp->flags & GPIO_FLAG_ACTIVE_LOW)
value = value == 0 ? 1 : 0;
return gp->chip->direction_output(gp, value); return gp->chip->direction_output(gp, value);
} }
int gpio_get(struct gpio_pin *gp) int gpio_get(struct gpio_pin *gp)
{ {
int value;
if (!gp || !gp->chip || (gp->chip->ngpio <= gp->offset)) if (!gp || !gp->chip || (gp->chip->ngpio <= gp->offset))
return SBI_EINVAL; return SBI_EINVAL;
if (!gp->chip->get) if (!gp->chip->get)
return SBI_ENOSYS; return SBI_ENOSYS;
return gp->chip->get(gp); value = gp->chip->get(gp);
if (gp->flags & GPIO_FLAG_ACTIVE_LOW)
value = value == 0 ? 1 : 0;
return value;
} }
int gpio_set(struct gpio_pin *gp, int value) int gpio_set(struct gpio_pin *gp, int value)
@@ -93,6 +102,9 @@ int gpio_set(struct gpio_pin *gp, int value)
if (!gp->chip->set) if (!gp->chip->set)
return SBI_ENOSYS; return SBI_ENOSYS;
if (gp->flags & GPIO_FLAG_ACTIVE_LOW)
value = value == 0 ? 1 : 0;
gp->chip->set(gp, value); gp->chip->set(gp, value);
return 0; return 0;
} }