drivers/pinctrl/core.h

   1 /*
   2  * Core private header for the pin control subsystem
   3  *
   4  * Copyright (C) 2011 ST-Ericsson SA
   5  * Written on behalf of Linaro for ST-Ericsson
   6  *
   7  * Author: Linus Walleij <linus.walleij@linaro.org>
   8  *
   9  * License terms: GNU General Public License (GPL) version 2
  10  */
  11
  12 /**
  13  * struct pinctrl_dev - pin control class device
  14  * @node: node to include this pin controller in the global pin controller list
  15  * @desc: the pin controller descriptor supplied when initializing this pin
  16  *      controller
  17  * @pin_desc_tree: each pin descriptor for this pin controller is stored in
  18  *      this radix tree
  19  * @pin_desc_tree_lock: lock for the descriptor tree
  20  * @gpio_ranges: a list of GPIO ranges that is handled by this pin controller,
  21  *      ranges are added to this list at runtime
  22  * @gpio_ranges_lock: lock for the GPIO ranges list
  23  * @dev: the device entry for this pin controller
  24  * @owner: module providing the pin controller, used for refcounting
  25  * @driver_data: driver data for drivers registering to the pin controller
  26  *      subsystem
  27  * @pinmux_hogs_lock: lock for the pinmux hog list
  28  * @pinmux_hogs: list of pinmux maps hogged by this device
  29  */
  30 struct pinctrl_dev {
  31         struct list_head node;
  32         struct pinctrl_desc *desc;
  33         struct radix_tree_root pin_desc_tree;
  34         spinlock_t pin_desc_tree_lock;
  35         struct list_head gpio_ranges;
  36         struct mutex gpio_ranges_lock;
  37         struct device dev;
  38         struct module *owner;
  39         void *driver_data;
  40 #ifdef CONFIG_PINMUX
  41         struct mutex pinmux_hogs_lock;
  42         struct list_head pinmux_hogs;
  43 #endif
  44 };
  45
  46 /**
  47  * struct pin_desc - pin descriptor for each physical pin in the arch
  48  * @pctldev: corresponding pin control device
  49  * @name: a name for the pin, e.g. the name of the pin/pad/finger on a
  50  *      datasheet or such
  51  * @lock: a lock to protect the descriptor structure
  52  * @mux_requested: whether the pin is already requested by pinmux or not
  53  * @mux_function: a named muxing function for the pin that will be passed to
  54  *      subdrivers and shown in debugfs etc
  55  */
  56 struct pin_desc {
  57         struct pinctrl_dev *pctldev;
  58         char    name[16];
  59         spinlock_t lock;
  60         /* These fields only added when supporting pinmux drivers */
  61 #ifdef CONFIG_PINMUX
  62         bool    mux_requested;
  63         char    mux_function[16];
  64 #endif
  65 };
  66
  67 struct pinctrl_dev *get_pinctrl_dev_from_dev(struct device *dev,
  68                                              const char *dev_name);
  69 struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, int pin);
  70 int pinctrl_get_device_gpio_range(unsigned gpio,
  71                                   struct pinctrl_dev **outdev,
  72                                   struct pinctrl_gpio_range **outrange);