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gpio: sam0: add pull up/pull down support.

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Also trim back the headers.

Signed-off-by: Michael Hope <mlhx@google.com>
This commit is contained in:
Michael Hope 2018-01-27 09:37:56 +01:00 committed by Kumar Gala
parent f7c1903418
commit c83f0782b6
1 changed files with 40 additions and 15 deletions
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55
drivers/gpio/gpio_sam0.c
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@ -5,11 +5,9 @@
*/
#include <errno.h>
#include <kernel.h>
#include <device.h>
#include <init.h>
#include <soc.h>
#include <gpio.h>
#include <soc.h>
struct gpio_sam0_config {
PortGroup *regs;
@ -22,12 +20,50 @@ static int gpio_sam0_config(struct device *dev, int access_op, u32_t pin,
int flags)
{
const struct gpio_sam0_config *config = DEV_CFG(dev);
PortGroup *regs = config->regs;
u32_t mask = 1 << pin;
bool is_out = (flags & GPIO_DIR_MASK) == GPIO_DIR_OUT;
int pud = flags & GPIO_PUD_MASK;
PORT_PINCFG_Type pincfg;
if (access_op != GPIO_ACCESS_BY_PIN) {
return -ENOTSUP;
}
/* Builds the configuration and writes it in one go */
pincfg.reg = 0;
pincfg.bit.INEN = 1;
/* Direction */
if (is_out) {
regs->DIRSET.bit.DIRSET = mask;
} else {
regs->DIRCLR.bit.DIRCLR = mask;
}
/* Pull up / pull down */
if (is_out && pud != GPIO_PUD_NORMAL) {
return -ENOTSUP;
}
switch (pud) {
case GPIO_PUD_NORMAL:
break;
case GPIO_PUD_PULL_UP:
pincfg.bit.PULLEN = 1;
regs->OUTSET.reg = mask;
break;
case GPIO_PUD_PULL_DOWN:
pincfg.bit.PULLEN = 1;
regs->OUTCLR.reg = mask;
break;
default:
return -ENOTSUP;
}
/* Write the now-built pin configuration */
regs->PINCFG[pin] = pincfg;
if ((flags & GPIO_INT) != 0) {
/* TODO(mlhx): implement. */
return -ENOTSUP;
@ -37,17 +73,6 @@ static int gpio_sam0_config(struct device *dev, int access_op, u32_t pin,
return -ENOTSUP;
}
if ((flags & GPIO_PUD_MASK) != GPIO_PUD_NORMAL) {
/* TODO(mlhx): implement. */
return -ENOTSUP;
}
if ((flags & GPIO_DIR_MASK) == GPIO_DIR_OUT) {
config->regs->DIRSET.bit.DIRSET = mask;
} else {
config->regs->DIRCLR.bit.DIRCLR = mask;
}
return 0;
}
@ -94,7 +119,7 @@ static const struct gpio_driver_api gpio_sam0_api = {
.read = gpio_sam0_read,
};
int gpio_sam0_init(struct device *dev) { return 0; }
static int gpio_sam0_init(struct device *dev) { return 0; }
/* Port A */
#ifdef CONFIG_GPIO_SAM0_PORTA_BASE_ADDRESS