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-rw-r--r--drivers/gpio/gpio-i8255.h46
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-i8255.h b/drivers/gpio/gpio-i8255.h
new file mode 100644
index 000000000..d9084aae9
--- /dev/null
+++ b/drivers/gpio/gpio-i8255.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright 2022 William Breathitt Gray */
+#ifndef _I8255_H_
+#define _I8255_H_
+
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+/**
+ * struct i8255 - Intel 8255 register structure
+ * @port: Port A, B, and C
+ * @control: Control register
+ */
+struct i8255 {
+ u8 port[3];
+ u8 control;
+};
+
+/**
+ * struct i8255_state - Intel 8255 state structure
+ * @lock: synchronization lock for accessing device state
+ * @control_state: Control register state
+ */
+struct i8255_state {
+ spinlock_t lock;
+ u8 control_state;
+};
+
+void i8255_direction_input(struct i8255 __iomem *ppi, struct i8255_state *state,
+ unsigned long offset);
+void i8255_direction_output(struct i8255 __iomem *ppi,
+ struct i8255_state *state, unsigned long offset,
+ unsigned long value);
+int i8255_get(struct i8255 __iomem *ppi, unsigned long offset);
+int i8255_get_direction(const struct i8255_state *state, unsigned long offset);
+void i8255_get_multiple(struct i8255 __iomem *ppi, const unsigned long *mask,
+ unsigned long *bits, unsigned long ngpio);
+void i8255_mode0_output(struct i8255 __iomem *const ppi);
+void i8255_set(struct i8255 __iomem *ppi, struct i8255_state *state,
+ unsigned long offset, unsigned long value);
+void i8255_set_multiple(struct i8255 __iomem *ppi, struct i8255_state *state,
+ const unsigned long *mask, const unsigned long *bits,
+ unsigned long ngpio);
+void i8255_state_init(struct i8255_state *const state, unsigned long nbanks);
+
+#endif /* _I8255_H_ */