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button: qcom-pmic: add software debounce

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This helps with reliability on some platforms. We should probably also
configure the hardware debounce timer eventually.

Link: https://lore.kernel.org/r/20241113045109.1838241-1-caleb.connolly@linaro.org
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
This commit is contained in:
Caleb Connolly 2024-11-13 05:51:03 +01:00
parent 8376161a03
commit 709ecea592
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GPG key ID: 7930459FB9303217
1 changed files with 12 additions and 2 deletions
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14
drivers/button/button-qcom-pmic.c
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@ -15,6 +15,7 @@
#include <power/pmic.h>
#include <spmi/spmi.h>
#include <linux/bitops.h>
#include <time.h>
#define REG_TYPE 0x4
#define REG_SUBTYPE 0x5
@ -31,6 +32,7 @@ struct qcom_pmic_btn_priv {
u32 status_bit;
int code;
struct udevice *pmic;
ulong last_release_time;
};
#define PON_INT_RT_STS 0x10
@ -42,13 +44,21 @@ struct qcom_pmic_btn_priv {
static enum button_state_t qcom_pwrkey_get_state(struct udevice *dev)
{
struct qcom_pmic_btn_priv *priv = dev_get_priv(dev);
bool pressed;
int reg;
int reg = pmic_reg_read(priv->pmic, priv->base + PON_INT_RT_STS);
if (get_timer_us(0) - priv->last_release_time < 25000)
return BUTTON_OFF;
reg = pmic_reg_read(priv->pmic, priv->base + PON_INT_RT_STS);
if (reg < 0)
return 0;
return (reg & BIT(priv->status_bit)) != 0;
pressed = !!(reg & BIT(priv->status_bit));
if (!pressed)
priv->last_release_time = get_timer_us(0);
return pressed;
}
static int qcom_pwrkey_get_code(struct udevice *dev)