Split driver-y things into a separate component

1 files changed, 60 insertions, 0 deletions

diff --git a/src/drivers/include/storage.hpp b/src/drivers/include/storage.hpp
new file mode 100644
index 00000000..cee49cc5
--- /dev/null
+++ b/src/drivers/include/storage.hpp
@@ -0,0 +1,60 @@
+#pragma once
+
+#include "gpio-expander.hpp"
+
+#include <memory>
+
+#include "driver/sdmmc_types.h"
+#include "driver/sdspi_host.h"
+#include "esp_err.h"
+#include "esp_vfs_fat.h"
+#include "result.hpp"
+
+namespace gay_ipod {
+
+extern const char* kStoragePath;
+
+class SdStorage {
+ public:
+  enum Error {
+    FAILED_TO_INIT,
+    /** We couldn't interact with the SD card at all. Is it missing? */
+    FAILED_TO_READ,
+    /** We couldn't mount the SD card. Is it formatted? */
+    FAILED_TO_MOUNT,
+  };
+
+  static auto create(GpioExpander* gpio)
+      -> cpp::result<std::unique_ptr<SdStorage>, Error>;
+
+  SdStorage(GpioExpander* gpio,
+            esp_err_t (*do_transaction)(sdspi_dev_handle_t, sdmmc_command_t*),
+            sdspi_dev_handle_t handle_,
+            std::unique_ptr<sdmmc_host_t>& host_,
+            std::unique_ptr<sdmmc_card_t>& card_,
+            FATFS* fs_);
+  ~SdStorage();
+
+  auto HandleTransaction(sdspi_dev_handle_t handle, sdmmc_command_t* cmdinfo)
+      -> esp_err_t;
+
+  // Not copyable or movable.
+  // TODO: maybe this could be movable?
+  SdStorage(const SdStorage&) = delete;
+  SdStorage& operator=(const SdStorage&) = delete;
+
+ private:
+  GpioExpander* gpio_;
+
+  esp_err_t (*do_transaction_)(sdspi_dev_handle_t, sdmmc_command_t*) = nullptr;
+
+  // SPI and SD driver info
+  sdspi_dev_handle_t handle_;
+  std::unique_ptr<sdmmc_host_t> host_;
+  std::unique_ptr<sdmmc_card_t> card_;
+
+  // Filesystem info
+  FATFS* fs_ = nullptr;
+};
+
+}  // namespace gay_ipod