cpu/sam0_common: clear tamper wake on gpio_irq_disable()

benpicco · benpicco · commit 15ffad4e39b7 · 2025-11-05T14:43:37.000+01:00
diff --git a/cpu/sam0_common/include/periph_cpu_common.h b/cpu/sam0_common/include/periph_cpu_common.h
@@ -1353,10 +1353,26 @@ void rtc_tamper_init(void);
  * @param   pin     The GPIO pin to be used for tamper detection
  * @param   flank   The Flank to trigger the even
  *
- * @return  0 on success, -1 if pin is not RTC pin
+ * @return  0 on success, -1 if pin is not an RTC pin
  */
 int rtc_tamper_register(gpio_t pin, gpio_flank_t flank);
 
+/**
+ * @brief   (Re-)Enable Tamper Detection pin
+ *
+ * @param   pin     The GPIO pin to be used for tamper detection
+ *
+ * @return  0 on success, -1 if pin is not an RTC pin
+ */
+int rtc_tamper_pin_enable(gpio_t pin);
+
+/**
+ * @brief   Disable Tamper Detection pin
+ *
+ * @param   pin     The GPIO pin to no longer be used for tamper detection
+ */
+void rtc_tamper_pin_disable(gpio_t pin);
+
 /**
  * @brief   Enable Tamper Detection IRQs
  */
diff --git a/cpu/sam0_common/periph/gpio.c b/cpu/sam0_common/periph/gpio.c
@@ -481,6 +481,10 @@ void gpio_irq_enable(gpio_t pin)
 
     /* enable wake from deep sleep */
     _set_extwake(pin, true);
+
+    if (IS_ACTIVE(MODULE_PERIPH_GPIO_TAMPER_WAKE)) {
+        rtc_tamper_pin_enable(pin);
+    }
 }
 
 void gpio_irq_disable(gpio_t pin)
@@ -502,6 +506,10 @@ void gpio_irq_disable(gpio_t pin)
 
     /* disable wake from deep sleep */
     _set_extwake(pin, false);
+
+    if (IS_ACTIVE(MODULE_PERIPH_GPIO_TAMPER_WAKE)) {
+        rtc_tamper_pin_disable(pin);
+    }
 }
 
 #if defined(CPU_COMMON_SAML1X)
diff --git a/cpu/sam0_common/periph/rtc_rtt.c b/cpu/sam0_common/periph/rtc_rtt.c
@@ -27,6 +27,7 @@
 #include <stdint.h>
 #include <string.h>
 
+#include "atomic_utils.h"
 #include "pm_layered.h"
 #include "periph/rtc.h"
 #include "periph/rtt.h"
@@ -503,6 +504,30 @@ int rtc_tamper_register(gpio_t pin, gpio_flank_t flank)
     return 0;
 }
 
+int rtc_tamper_pin_enable(gpio_t pin)
+{
+    int in = _rtc_pin(pin);
+
+    if (in < 0) {
+        return -1;
+    }
+
+    atomic_set_bit_u32(atomic_bit_u32(&tampctr, 2 * in));
+
+    return 0;
+}
+
+void rtc_tamper_pin_disable(gpio_t pin)
+{
+    int in = _rtc_pin(pin);
+
+    if (in < 0) {
+        return;
+    }
+
+    atomic_clear_bit_u32(atomic_bit_u32(&tampctr, 2 * in));
+}
+
 void rtc_tamper_enable(void)
 {
     DEBUG("enable tamper\n");
