gpiolib: provide a declaration of seq_file in gpio/driver.h

[karo-tx-linux.git] / include / linux / gpio / driver.h

diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 5dc172c72f0fa52c3c4b23faf13eadeb4fc8073f..656a27efb2c8cdd755cd78e20a36e5dd028e5310 100644 (file)
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -5,6 +5,7 @@
 
 struct device;
 struct gpio_desc;
+struct seq_file;
 
 /**
  * struct gpio_chip - abstract a GPIO controller
@@ -124,4 +125,60 @@ extern struct gpio_chip *gpiochip_find(void *data,
 int gpiod_lock_as_irq(struct gpio_desc *desc);
 void gpiod_unlock_as_irq(struct gpio_desc *desc);
 
+/**
+ * Lookup table for associating GPIOs to specific devices and functions using
+ * platform data.
+ */
+struct gpiod_lookup {
+       struct list_head list;
+       /*
+        * name of the chip the GPIO belongs to
+        */
+       const char *chip_label;
+       /*
+        * hardware number (i.e. relative to the chip) of the GPIO
+        */
+       u16 chip_hwnum;
+       /*
+        * name of device that can claim this GPIO
+        */
+       const char *dev_id;
+       /*
+        * name of the GPIO from the device's point of view
+        */
+       const char *con_id;
+       /*
+        * index of the GPIO in case several GPIOs share the same name
+        */
+       unsigned int idx;
+       /*
+        * mask of GPIOF_* values
+        */
+       unsigned long flags;
+};
+
+/*
+ * Simple definition of a single GPIO under a con_id
+ */
+#define GPIO_LOOKUP(_chip_label, _chip_hwnum, _dev_id, _con_id, _flags) \
+       GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _dev_id, _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, _dev_id, _con_id, _idx, \
+                       _flags)                                           \
+{                                                                         \
+       .chip_label = _chip_label,                                        \
+       .chip_hwnum = _chip_hwnum,                                        \
+       .dev_id = _dev_id,                                                \
+       .con_id = _con_id,                                                \
+       .idx = _idx,                                                      \
+       .flags = _flags,                                                  \
+}
+
+void gpiod_add_table(struct gpiod_lookup *table, size_t size);
+
 #endif