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 const char *name; 59 spinlock_t lock; 60 /* These fields only added when supporting pinmux drivers */ 61 #ifdef CONFIG_PINMUX 62 const char *mux_function; 63 #endif 64 }; 65 66 struct pinctrl_dev *get_pinctrl_dev_from_dev(struct device *dev, 67 const char *dev_name); 68 struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, int pin); 69 int pinctrl_get_device_gpio_range(unsigned gpio, 70 struct pinctrl_dev **outdev, 71 struct pinctrl_gpio_range **outrange); 72