Add support for config reset

src/scarlett2-ioctls.c

@@ -0,0 +1,74 @@
+// SPDX-FileCopyrightText: 2023 Geoffrey D. Bennett <g@b4.vu>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <stdio.h>
+#include <alsa/asoundlib.h>
+
+#include "scarlett2.h"
+
+#include "scarlett2-ioctls.h"
+
+int scarlett2_open_card(char *alsa_name, snd_hwdep_t **hwdep) {
+  return snd_hwdep_open(hwdep, alsa_name, SND_HWDEP_OPEN_DUPLEX);
+}
+
+int scarlett2_get_protocol_version(snd_hwdep_t *hwdep) {
+  int version = 0;
+  int err = snd_hwdep_ioctl(hwdep, SCARLETT2_IOCTL_PVERSION, &version);
+
+  if (err < 0)
+    return err;
+  return version;
+}
+
+int scarlett2_close(snd_hwdep_t *hwdep) {
+  return snd_hwdep_close(hwdep);
+}
+
+int scarlett2_reboot(snd_hwdep_t *hwdep) {
+  return snd_hwdep_ioctl(hwdep, SCARLETT2_IOCTL_REBOOT, 0);
+}
+
+static int scarlett2_select_flash_segment(snd_hwdep_t *hwdep, int segment) {
+  return snd_hwdep_ioctl(hwdep, SCARLETT2_IOCTL_SELECT_FLASH_SEGMENT, &segment);
+}
+
+static int scarlett2_erase_flash_segment(snd_hwdep_t *hwdep) {
+  return snd_hwdep_ioctl(hwdep, SCARLETT2_IOCTL_ERASE_FLASH_SEGMENT, 0);
+}
+
+int scarlett2_erase_config(snd_hwdep_t *hwdep) {
+  int err;
+
+  err = scarlett2_select_flash_segment(hwdep, SCARLETT2_SEGMENT_ID_SETTINGS);
+  if (err < 0)
+    return err;
+  return scarlett2_erase_flash_segment(hwdep);
+}
+
+int scarlett2_erase_firmware(snd_hwdep_t *hwdep) {
+  int err;
+
+  err = scarlett2_select_flash_segment(hwdep, SCARLETT2_SEGMENT_ID_FIRMWARE);
+  if (err < 0)
+    return err;
+  return scarlett2_erase_flash_segment(hwdep);
+}
+
+int scarlett2_get_erase_progress(snd_hwdep_t *hwdep) {
+  struct scarlett2_flash_segment_erase_progress progress;
+
+  int err = snd_hwdep_ioctl(
+    hwdep, SCARLETT2_IOCTL_GET_ERASE_PROGRESS, &progress
+  );
+  if (err < 0)
+    return err;
+
+  // translate progress from [1..num_blocks, 255] to [[0..100), 255]]
+  if (progress.num_blocks == 0 ||
+      progress.progress == 0 ||
+      progress.progress == 255)
+    return progress.progress;
+
+  return (progress.progress - 1) * 100 / progress.num_blocks;
+}