/*
* This serves as both the GPIO IRQ handler and the debounce handler. When
* called as the debounce handler, IRQs are probably not already disabled when
* entering this function.
*/
static int ara_key_irqhandler(int irq, void *context)
{
struct ara_key_context *key = &the_ara_key;
bool value, active;
irqstate_t flags;
flags = irqsave();
value = !!gpio_get_value(key->db.gpio);
active = (value == key->rising_edge);
dbg_insane("ara key press value: %u active: %u\n", value, active);
if (!debounce_gpio(&key->db, active)) {
goto out;
}
dbg_insane("ara key press value: %u active: %u (stable)\n", value, active);
/* if something is pending, cancel it so we can pass the correct active */
if (!work_available(&key->irq_work)) {
work_cancel(HPWORK, &key->irq_work);
}
work_queue(HPWORK, &key->irq_work, ara_key_irqworker,
(void*)(uintptr_t)active, 0);
out:
irqrestore(flags);
return OK;
}
/**
* @brief Configure all the GPIOs associated with a voltage regulator
* to their default states.
* @param vreg regulator to configure
*/
int vreg_config(struct vreg *vreg) {
unsigned int i;
int rc = 0;
if (!vreg) {
return -ENODEV;
}
dbg_verbose("%s %s\n", __func__, vreg->name ? vreg->name : "unknown");
for (i = 0; i < vreg->nr_vregs; i++) {
if (!&vreg->vregs[i]) {
rc = -EINVAL;
break;
}
dbg_insane("%s: %s vreg, gpio %d\n", __func__,
vreg->name ? vreg->name : "unknown",
vreg->vregs[i].gpio);
// First set default value then switch line to output mode
gpio_set_value(vreg->vregs[i].gpio, vreg->vregs[i].def_val);
gpio_direction_out(vreg->vregs[i].gpio, vreg->vregs[i].def_val);
}
atomic_init(&vreg->use_count, 0);
vreg->power_state = false;
return rc;
}
/**
* @brief Manage the regulator state; Turn it on when needed
* @returns: 0 on success, <0 on error
*/
int vreg_get(struct vreg *vreg) {
unsigned int i, rc = 0;
if (!vreg) {
return -ENODEV;
}
dbg_verbose("%s %s\n", __func__, vreg->name ? vreg->name : "unknown");
/* Enable the regulator on the first use; Update use count */
if (atomic_inc(&vreg->use_count) == 1) {
for (i = 0; i < vreg->nr_vregs; i++) {
if (!&vreg->vregs[i]) {
rc = -EINVAL;
break;
}
dbg_insane("%s: %s vreg, gpio %d to %d, hold %dus\n", __func__,
vreg->name ? vreg->name : "unknown",
vreg->vregs[i].gpio, !!vreg->vregs[i].active_high,
vreg->vregs[i].hold_time);
gpio_set_value(vreg->vregs[i].gpio, vreg->vregs[i].active_high);
up_udelay(vreg->vregs[i].hold_time);
}
}
/* Update state */
vreg->power_state = true;
return rc;
}
/**
* @brief Manage the regulator state; Turn it off when unused
* @returns: 0 on success, <0 on error
*/
int vreg_put(struct vreg *vreg) {
unsigned int i, rc = 0;
if (!vreg) {
return -ENODEV;
}
dbg_verbose("%s %s\n", __func__, vreg->name ? vreg->name : "unknown");
/* If already disabled, do nothing */
if (!atomic_get(&vreg->use_count))
return rc;
/* Disable the regulator on the last use; Update use count */
if (!atomic_dec(&vreg->use_count)) {
for (i = 0; i < vreg->nr_vregs; i++) {
if (!&vreg->vregs[i]) {
rc = -EINVAL;
break;
}
dbg_insane("%s: %s vreg, gpio %08x to %d\n", __func__,
vreg->name ? vreg->name : "unknown",
vreg->vregs[i].gpio, !vreg->vregs[i].active_high);
gpio_set_value(vreg->vregs[i].gpio, !vreg->vregs[i].active_high);
}
/* Update state */
vreg->power_state = false;
}
return rc;
}
