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); 84