1 files changed, 133 insertions, 0 deletions

diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h
new file mode 100644
index 00000000000..4f8d2089acc
--- /dev/null
+++ b/include/linux/pinctrl/pinctrl.h
@@ -0,0 +1,133 @@
+/*
+ * Interface the pinctrl subsystem
+ *
+ * Copyright (C) 2011 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ * This interface is used in the core to keep track of pins.
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+#ifndef __LINUX_PINCTRL_PINCTRL_H
+#define __LINUX_PINCTRL_PINCTRL_H
+
+#ifdef CONFIG_PINCTRL
+
+#include <linux/radix-tree.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/seq_file.h>
+
+struct pinctrl_dev;
+struct pinmux_ops;
+struct gpio_chip;
+
+/**
+ * struct pinctrl_pin_desc - boards/machines provide information on their
+ * pins, pads or other muxable units in this struct
+ * @number: unique pin number from the global pin number space
+ * @name: a name for this pin
+ */
+struct pinctrl_pin_desc {
+        unsigned number;
+        const char *name;
+};
+
+/* Convenience macro to define a single named or anonymous pin descriptor */
+#define PINCTRL_PIN(a, b) { .number = a, .name = b }
+#define PINCTRL_PIN_ANON(a) { .number = a }
+
+/**
+ * struct pinctrl_gpio_range - each pin controller can provide subranges of
+ * the GPIO number space to be handled by the controller
+ * @node: list node for internal use
+ * @name: a name for the chip in this range
+ * @id: an ID number for the chip in this range
+ * @base: base offset of the GPIO range
+ * @npins: number of pins in the GPIO range, including the base number
+ * @gc: an optional pointer to a gpio_chip
+ */
+struct pinctrl_gpio_range {
+        struct list_head node;
+        const char *name;
+        unsigned int id;
+        unsigned int base;
+        unsigned int npins;
+        struct gpio_chip *gc;
+};
+
+/**
+ * struct pinctrl_ops - global pin control operations, to be implemented by
+ * pin controller drivers.
+ * @list_groups: list the number of selectable named groups available
+ *      in this pinmux driver, the core will begin on 0 and call this
+ *      repeatedly as long as it returns >= 0 to enumerate the groups
+ * @get_group_name: return the group name of the pin group
+ * @get_group_pins: return an array of pins corresponding to a certain
+ *      group selector @pins, and the size of the array in @num_pins
+ * @pin_dbg_show: optional debugfs display hook that will provide per-device
+ *      info for a certain pin in debugfs
+ */
+struct pinctrl_ops {
+        int (*list_groups) (struct pinctrl_dev *pctldev, unsigned selector);
+        const char *(*get_group_name) (struct pinctrl_dev *pctldev,
+                                       unsigned selector);
+        int (*get_group_pins) (struct pinctrl_dev *pctldev,
+                               unsigned selector,
+                               unsigned ** const pins,
+                               unsigned * const num_pins);
+        void (*pin_dbg_show) (struct pinctrl_dev *pctldev, struct seq_file *s,
+                          unsigned offset);
+};
+
+/**
+ * struct pinctrl_desc - pin controller descriptor, register this to pin
+ * control subsystem
+ * @name: name for the pin controller
+ * @pins: an array of pin descriptors describing all the pins handled by
+ *      this pin controller
+ * @npins: number of descriptors in the array, usually just ARRAY_SIZE()
+ *      of the pins field above
+ * @maxpin: since pin spaces may be sparse, there can he "holes" in the
+ *      pin range, this attribute gives the maximum pin number in the
+ *      total range. This should not be lower than npins for example,
+ *      but may be equal to npins if you have no holes in the pin range.
+ * @pctlops: pin control operation vtable, to support global concepts like
+ *      grouping of pins, this is optional.
+ * @pmxops: pinmux operation vtable, if you support pinmuxing in your driver
+ * @owner: module providing the pin controller, used for refcounting
+ */
+struct pinctrl_desc {
+        const char *name;
+        struct pinctrl_pin_desc const *pins;
+        unsigned int npins;
+        unsigned int maxpin;
+        struct pinctrl_ops *pctlops;
+        struct pinmux_ops *pmxops;
+        struct module *owner;
+};
+
+/* External interface to pin controller */
+extern struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
+                                struct device *dev, void *driver_data);
+extern void pinctrl_unregister(struct pinctrl_dev *pctldev);
+extern bool pin_is_valid(struct pinctrl_dev *pctldev, int pin);
+extern void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
+                                struct pinctrl_gpio_range *range);
+extern void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
+                                struct pinctrl_gpio_range *range);
+extern const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev);
+extern void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev);
+#else
+
+
+/* Sufficiently stupid default function when pinctrl is not in use */
+static inline bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
+{
+        return pin >= 0;
+}
+
+#endif /* !CONFIG_PINCTRL */
+
+#endif /* __LINUX_PINCTRL_PINCTRL_H */