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-rw-r--r--include/linux/pinctrl/pinmux.h86
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diff --git a/include/linux/pinctrl/pinmux.h b/include/linux/pinctrl/pinmux.h
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+++ b/include/linux/pinctrl/pinmux.h
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+/*
+ * Interface the pinmux subsystem
+ *
+ * Copyright (C) 2011 ST-Ericsson SA
+ * Written on behalf of Linaro for ST-Ericsson
+ * Based on bits of regulator core, gpio core and clk core
+ *
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ */
+#ifndef __LINUX_PINCTRL_PINMUX_H
+#define __LINUX_PINCTRL_PINMUX_H
+
+#include <linux/list.h>
+#include <linux/seq_file.h>
+#include <linux/pinctrl/pinctrl.h>
+
+#ifdef CONFIG_PINMUX
+
+struct pinctrl_dev;
+
+/**
+ * struct pinmux_ops - pinmux operations, to be implemented by pin controller
+ * drivers that support pinmuxing
+ * @request: called by the core to see if a certain pin can be made
+ * available for muxing. This is called by the core to acquire the pins
+ * before selecting any actual mux setting across a function. The driver
+ * is allowed to answer "no" by returning a negative error code
+ * @free: the reverse function of the request() callback, frees a pin after
+ * being requested
+ * @get_functions_count: returns number of selectable named functions available
+ * in this pinmux driver
+ * @get_function_name: return the function name of the muxing selector,
+ * called by the core to figure out which mux setting it shall map a
+ * certain device to
+ * @get_function_groups: return an array of groups names (in turn
+ * referencing pins) connected to a certain function selector. The group
+ * name can be used with the generic @pinctrl_ops to retrieve the
+ * actual pins affected. The applicable groups will be returned in
+ * @groups and the number of groups in @num_groups
+ * @set_mux: enable a certain muxing function with a certain pin group. The
+ * driver does not need to figure out whether enabling this function
+ * conflicts some other use of the pins in that group, such collisions
+ * are handled by the pinmux subsystem. The @func_selector selects a
+ * certain function whereas @group_selector selects a certain set of pins
+ * to be used. On simple controllers the latter argument may be ignored
+ * @gpio_request_enable: requests and enables GPIO on a certain pin.
+ * Implement this only if you can mux every pin individually as GPIO. The
+ * affected GPIO range is passed along with an offset(pin number) into that
+ * specific GPIO range - function selectors and pin groups are orthogonal
+ * to this, the core will however make sure the pins do not collide.
+ * @gpio_disable_free: free up GPIO muxing on a certain pin, the reverse of
+ * @gpio_request_enable
+ * @gpio_set_direction: Since controllers may need different configurations
+ * depending on whether the GPIO is configured as input or output,
+ * a direction selector function may be implemented as a backing
+ * to the GPIO controllers that need pin muxing.
+ */
+struct pinmux_ops {
+ int (*request) (struct pinctrl_dev *pctldev, unsigned offset);
+ int (*free) (struct pinctrl_dev *pctldev, unsigned offset);
+ int (*get_functions_count) (struct pinctrl_dev *pctldev);
+ const char *(*get_function_name) (struct pinctrl_dev *pctldev,
+ unsigned selector);
+ int (*get_function_groups) (struct pinctrl_dev *pctldev,
+ unsigned selector,
+ const char * const **groups,
+ unsigned * const num_groups);
+ int (*set_mux) (struct pinctrl_dev *pctldev, unsigned func_selector,
+ unsigned group_selector);
+ int (*gpio_request_enable) (struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned offset);
+ void (*gpio_disable_free) (struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned offset);
+ int (*gpio_set_direction) (struct pinctrl_dev *pctldev,
+ struct pinctrl_gpio_range *range,
+ unsigned offset,
+ bool input);
+};
+
+#endif /* CONFIG_PINMUX */
+
+#endif /* __LINUX_PINCTRL_PINMUX_H */