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 #include <linux/pinctrl/pinconf.h>
  13
  14 struct pinctrl_gpio_range;
  15
  16 /**
  17  * struct pinctrl_dev - pin control class device
  18  * @node: node to include this pin controller in the global pin controller list
  19  * @desc: the pin controller descriptor supplied when initializing this pin
  20  *      controller
  21  * @pin_desc_tree: each pin descriptor for this pin controller is stored in
  22  *      this radix tree
  23  * @pin_desc_tree_lock: lock for the descriptor tree
  24  * @gpio_ranges: a list of GPIO ranges that is handled by this pin controller,
  25  *      ranges are added to this list at runtime
  26  * @gpio_ranges_lock: lock for the GPIO ranges list
  27  * @dev: the device entry for this pin controller
  28  * @owner: module providing the pin controller, used for refcounting
  29  * @driver_data: driver data for drivers registering to the pin controller
  30  *      subsystem
  31  * @pinmux_hogs_lock: lock for the pinmux hog list
  32  * @pinmux_hogs: list of pinmux maps hogged by this device
  33  */
  34 struct pinctrl_dev {
  35         struct list_head node;
  36         struct pinctrl_desc *desc;
  37         struct radix_tree_root pin_desc_tree;
  38         spinlock_t pin_desc_tree_lock;
  39         struct list_head gpio_ranges;
  40         struct mutex gpio_ranges_lock;
  41         struct device *dev;
  42         struct module *owner;
  43         void *driver_data;
  44 #ifdef CONFIG_DEBUG_FS
  45         struct dentry *device_root;
  46 #endif
  47 #ifdef CONFIG_PINMUX
  48         struct mutex pinmux_hogs_lock;
  49         struct list_head pinmux_hogs;
  50 #endif
  51 };
  52
  53 /**
  54  * struct pin_desc - pin descriptor for each physical pin in the arch
  55  * @pctldev: corresponding pin control device
  56  * @name: a name for the pin, e.g. the name of the pin/pad/finger on a
  57  *      datasheet or such
  58  * @dynamic_name: if the name of this pin was dynamically allocated
  59  * @lock: a lock to protect the descriptor structure
  60  * @mux_requested: whether the pin is already requested by pinmux or not
  61  * @mux_function: a named muxing function for the pin that will be passed to
  62  *      subdrivers and shown in debugfs etc
  63  */
  64 struct pin_desc {
  65         struct pinctrl_dev *pctldev;
  66         const char *name;
  67         bool dynamic_name;
  68         spinlock_t lock;
  69         /* These fields only added when supporting pinmux drivers */
  70 #ifdef CONFIG_PINMUX
  71         const char *mux_function;
  72 #endif
  73 };
  74
  75 struct pinctrl_dev *get_pinctrl_dev_from_dev(struct device *dev,
  76                                              const char *dev_name);
  77 struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, unsigned int pin);
  78 int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name);
  79 int pinctrl_get_device_gpio_range(unsigned gpio,
  80                                   struct pinctrl_dev **outdev,
  81                                   struct pinctrl_gpio_range **outrange);
  82 int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
  83                                const char *pin_group);