linux/include/linux/pinctrl/pinmux.h
<<
>>
Prefs
   1/*
   2 * Interface the pinmux subsystem
   3 *
   4 * Copyright (C) 2011 ST-Ericsson SA
   5 * Written on behalf of Linaro for ST-Ericsson
   6 * Based on bits of regulator core, gpio core and clk core
   7 *
   8 * Author: Linus Walleij <linus.walleij@linaro.org>
   9 *
  10 * License terms: GNU General Public License (GPL) version 2
  11 */
  12#ifndef __LINUX_PINCTRL_PINMUX_H
  13#define __LINUX_PINCTRL_PINMUX_H
  14
  15#include <linux/list.h>
  16#include <linux/seq_file.h>
  17#include <linux/pinctrl/pinctrl.h>
  18
  19#ifdef CONFIG_PINMUX
  20
  21struct pinctrl_dev;
  22
  23/**
  24 * struct pinmux_ops - pinmux operations, to be implemented by pin controller
  25 * drivers that support pinmuxing
  26 * @request: called by the core to see if a certain pin can be made
  27 *      available for muxing. This is called by the core to acquire the pins
  28 *      before selecting any actual mux setting across a function. The driver
  29 *      is allowed to answer "no" by returning a negative error code
  30 * @free: the reverse function of the request() callback, frees a pin after
  31 *      being requested
  32 * @get_functions_count: returns number of selectable named functions available
  33 *      in this pinmux driver
  34 * @get_function_name: return the function name of the muxing selector,
  35 *      called by the core to figure out which mux setting it shall map a
  36 *      certain device to
  37 * @get_function_groups: return an array of groups names (in turn
  38 *      referencing pins) connected to a certain function selector. The group
  39 *      name can be used with the generic @pinctrl_ops to retrieve the
  40 *      actual pins affected. The applicable groups will be returned in
  41 *      @groups and the number of groups in @num_groups
  42 * @set_mux: enable a certain muxing function with a certain pin group. The
  43 *      driver does not need to figure out whether enabling this function
  44 *      conflicts some other use of the pins in that group, such collisions
  45 *      are handled by the pinmux subsystem. The @func_selector selects a
  46 *      certain function whereas @group_selector selects a certain set of pins
  47 *      to be used. On simple controllers the latter argument may be ignored
  48 * @gpio_request_enable: requests and enables GPIO on a certain pin.
  49 *      Implement this only if you can mux every pin individually as GPIO. The
  50 *      affected GPIO range is passed along with an offset(pin number) into that
  51 *      specific GPIO range - function selectors and pin groups are orthogonal
  52 *      to this, the core will however make sure the pins do not collide.
  53 * @gpio_disable_free: free up GPIO muxing on a certain pin, the reverse of
  54 *      @gpio_request_enable
  55 * @gpio_set_direction: Since controllers may need different configurations
  56 *      depending on whether the GPIO is configured as input or output,
  57 *      a direction selector function may be implemented as a backing
  58 *      to the GPIO controllers that need pin muxing.
  59 * @strict: do not allow simultaneous use of the same pin for GPIO and another
  60 *      function. Check both gpio_owner and mux_owner strictly before approving
  61 *      the pin request.
  62 */
  63struct pinmux_ops {
  64        int (*request) (struct pinctrl_dev *pctldev, unsigned offset);
  65        int (*free) (struct pinctrl_dev *pctldev, unsigned offset);
  66        int (*get_functions_count) (struct pinctrl_dev *pctldev);
  67        const char *(*get_function_name) (struct pinctrl_dev *pctldev,
  68                                          unsigned selector);
  69        int (*get_function_groups) (struct pinctrl_dev *pctldev,
  70                                  unsigned selector,
  71                                  const char * const **groups,
  72                                  unsigned *num_groups);
  73        int (*set_mux) (struct pinctrl_dev *pctldev, unsigned func_selector,
  74                        unsigned group_selector);
  75        int (*gpio_request_enable) (struct pinctrl_dev *pctldev,
  76                                    struct pinctrl_gpio_range *range,
  77                                    unsigned offset);
  78        void (*gpio_disable_free) (struct pinctrl_dev *pctldev,
  79                                   struct pinctrl_gpio_range *range,
  80                                   unsigned offset);
  81        int (*gpio_set_direction) (struct pinctrl_dev *pctldev,
  82                                   struct pinctrl_gpio_range *range,
  83                                   unsigned offset,
  84                                   bool input);
  85        bool strict;
  86};
  87
  88#endif /* CONFIG_PINMUX */
  89
  90#endif /* __LINUX_PINCTRL_PINMUX_H */
  91