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-rw-r--r--include/linux/gpio/machine.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/include/linux/gpio/machine.h b/include/linux/gpio/machine.h
new file mode 100644
index 000000000..e2706140e
--- /dev/null
+++ b/include/linux/gpio/machine.h
@@ -0,0 +1,61 @@
+#ifndef __LINUX_GPIO_MACHINE_H
+#define __LINUX_GPIO_MACHINE_H
+
+#include <linux/types.h>
+#include <linux/list.h>
+
+enum gpio_lookup_flags {
+ GPIO_ACTIVE_HIGH = (0 << 0),
+ GPIO_ACTIVE_LOW = (1 << 0),
+ GPIO_OPEN_DRAIN = (1 << 1),
+ GPIO_OPEN_SOURCE = (1 << 2),
+};
+
+/**
+ * struct gpiod_lookup - lookup table
+ * @chip_label: name of the chip the GPIO belongs to
+ * @chip_hwnum: hardware number (i.e. relative to the chip) of the GPIO
+ * @con_id: name of the GPIO from the device's point of view
+ * @idx: index of the GPIO in case several GPIOs share the same name
+ * @flags: mask of GPIO_* values
+ *
+ * gpiod_lookup is a lookup table for associating GPIOs to specific devices and
+ * functions using platform data.
+ */
+struct gpiod_lookup {
+ const char *chip_label;
+ u16 chip_hwnum;
+ const char *con_id;
+ unsigned int idx;
+ enum gpio_lookup_flags flags;
+};
+
+struct gpiod_lookup_table {
+ struct list_head list;
+ const char *dev_id;
+ struct gpiod_lookup table[];
+};
+
+/*
+ * Simple definition of a single GPIO under a con_id
+ */
+#define GPIO_LOOKUP(_chip_label, _chip_hwnum, _con_id, _flags) \
+ GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, 0, _flags)
+
+/*
+ * Use this macro if you need to have several GPIOs under the same con_id.
+ * Each GPIO needs to use a different index and can be accessed using
+ * gpiod_get_index()
+ */
+#define GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _con_id, _idx, _flags) \
+{ \
+ .chip_label = _chip_label, \
+ .chip_hwnum = _chip_hwnum, \
+ .con_id = _con_id, \
+ .idx = _idx, \
+ .flags = _flags, \
+}
+
+void gpiod_add_lookup_table(struct gpiod_lookup_table *table);
+
+#endif /* __LINUX_GPIO_MACHINE_H */