From 8b1c54934e80edc2d36abac9d9c96fe1e01cb669 Mon Sep 17 00:00:00 2001
From: Jan Kiszka <jan.kiszka@siemens.com>
Date: Mon, 18 Jan 2021 09:14:35 +0100
Subject: [PATCH] iot2050: Add USER button

A simple GPIO, no muxing needed, no pulling supported. Therefore, reject
any mode changes that request pull up/down, ignore the others.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 include/arm/siemens/iot2050.h |  2 +-
 src/arm/siemens/iot2050.c     | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/include/arm/siemens/iot2050.h b/include/arm/siemens/iot2050.h
index 0acf0a0..76df024 100644
--- a/include/arm/siemens/iot2050.h
+++ b/include/arm/siemens/iot2050.h
@@ -30,7 +30,7 @@ extern "C" {
 #include "mraa_internal.h"
 
 #define PLATFORM_NAME                   "SIMATIC IOT2050"
-#define MRAA_IOT2050_PINCOUNT          (20)
+#define MRAA_IOT2050_PINCOUNT          21
 
 mraa_board_t *
         mraa_siemens_iot2050();
diff --git a/src/arm/siemens/iot2050.c b/src/arm/siemens/iot2050.c
index 2f27475..cec25fa 100644
--- a/src/arm/siemens/iot2050.c
+++ b/src/arm/siemens/iot2050.c
@@ -154,6 +154,11 @@ iot2050_gpio_mode_replace(mraa_gpio_context dev, mraa_gpio_mode_t mode)
         ret = MRAA_ERROR_INVALID_RESOURCE;
         goto failed;
     }
+    /* Handle mode changes for interface pins without pull pin */
+    if (pull_en_pins[dev->phy_pin] == -1) {
+        return (mode == MRAA_GPIO_STRONG || mode == MRAA_GPIO_HIZ) ?
+            MRAA_SUCCESS : MRAA_ERROR_FEATURE_NOT_IMPLEMENTED;
+    }
     info = iot2050_get_regmux_by_pinmap(dev->pin);
     pull_en_pin = mraa_gpio_init_raw(pull_en_pins[dev->phy_pin]);
     if(pull_en_pin == NULL) {
@@ -1207,6 +1212,25 @@ mraa_siemens_iot2050()
     iot2050_pin_add_aio(b, pin_index, 5, mux_info, 5);
     pin_index++;
 
+    iot2050_setup_pins(b, pin_index, "USER",
+                        (mraa_pincapabilities_t) {
+                            1,  /*valid*/
+                            1,  /*gpio*/
+                            0,  /*pwm*/
+                            0,  /*fast gpio*/
+                            0,  /*spi*/
+                            0,  /*i2c*/
+                            0,  /*aio*/
+                            0}, /*uart*/
+                        (regmux_info_t) {
+                            -1,
+                            -1,
+                            wkup_gpio0_base+25,
+                            {}
+                        });
+    iot2050_pin_add_gpio(b, pin_index, wkup_gpio0_chip, 25, -1, -1, NULL, 0);
+    pin_index++;
+
     /* UART */
     iot2050_setup_uart(b, "UART0", "/dev/ttyS1", "IO0", "IO1", "IO2", "IO3");
     b->def_uart_dev = 0;