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/mutex.h> 13 #include <linux/radix-tree.h> 14 #include <linux/pinctrl/pinconf.h> 15 #include <linux/pinctrl/machine.h> 16 17 struct pinctrl_gpio_range; 18 19 /** 20 * struct pinctrl_dev - pin control class device 21 * @node: node to include this pin controller in the global pin controller list 22 * @desc: the pin controller descriptor supplied when initializing this pin 23 * controller 24 * @pin_desc_tree: each pin descriptor for this pin controller is stored in 25 * this radix tree 26 * @gpio_ranges: a list of GPIO ranges that is handled by this pin controller, 27 * ranges are added to this list at runtime 28 * @dev: the device entry for this pin controller 29 * @owner: module providing the pin controller, used for refcounting 30 * @driver_data: driver data for drivers registering to the pin controller 31 * subsystem 32 * @p: result of pinctrl_get() for this device 33 * @device_root: debugfs root for this device 34 */ 35 struct pinctrl_dev { 36 struct list_head node; 37 struct pinctrl_desc *desc; 38 struct radix_tree_root pin_desc_tree; 39 struct list_head gpio_ranges; 40 struct device *dev; 41 struct module *owner; 42 void *driver_data; 43 struct pinctrl *p; 44 #ifdef CONFIG_DEBUG_FS 45 struct dentry *device_root; 46 #endif 47 }; 48 49 /** 50 * struct pinctrl - per-device pin control state holder 51 * @node: global list node 52 * @dev: the device using this pin control handle 53 * @states: a list of states for this device 54 * @state: the current state 55 * @dt_maps: the mapping table chunks dynamically parsed from device tree for 56 * this device, if any 57 */ 58 struct pinctrl { 59 struct list_head node; 60 struct device *dev; 61 struct list_head states; 62 struct pinctrl_state *state; 63 struct list_head dt_maps; 64 }; 65 66 /** 67 * struct pinctrl_state - a pinctrl state for a device 68 * @node: list not for struct pinctrl's @states field 69 * @name: the name of this state 70 * @settings: a list of settings for this state 71 */ 72 struct pinctrl_state { 73 struct list_head node; 74 const char *name; 75 struct list_head settings; 76 }; 77 78 /** 79 * struct pinctrl_setting_mux - setting data for MAP_TYPE_MUX_GROUP 80 * @group: the group selector to program 81 * @func: the function selector to program 82 */ 83 struct pinctrl_setting_mux { 84 unsigned group; 85 unsigned func; 86 }; 87 88 /** 89 * struct pinctrl_setting_configs - setting data for MAP_TYPE_CONFIGS_* 90 * @group_or_pin: the group selector or pin ID to program 91 * @configs: a pointer to an array of config parameters/values to program into 92 * hardware. Each individual pin controller defines the format and meaning 93 * of config parameters. 94 * @num_configs: the number of entries in array @configs 95 */ 96 struct pinctrl_setting_configs { 97 unsigned group_or_pin; 98 unsigned long *configs; 99 unsigned num_configs; 100 }; 101 102 /** 103 * struct pinctrl_setting - an individual mux or config setting 104 * @node: list node for struct pinctrl_settings's @settings field 105 * @type: the type of setting 106 * @pctldev: pin control device handling to be programmed. Not used for 107 * PIN_MAP_TYPE_DUMMY_STATE. 108 * @data: Data specific to the setting type 109 */ 110 struct pinctrl_setting { 111 struct list_head node; 112 enum pinctrl_map_type type; 113 struct pinctrl_dev *pctldev; 114 union { 115 struct pinctrl_setting_mux mux; 116 struct pinctrl_setting_configs configs; 117 } data; 118 }; 119 120 /** 121 * struct pin_desc - pin descriptor for each physical pin in the arch 122 * @pctldev: corresponding pin control device 123 * @name: a name for the pin, e.g. the name of the pin/pad/finger on a 124 * datasheet or such 125 * @dynamic_name: if the name of this pin was dynamically allocated 126 * @mux_usecount: If zero, the pin is not claimed, and @owner should be NULL. 127 * If non-zero, this pin is claimed by @owner. This field is an integer 128 * rather than a boolean, since pinctrl_get() might process multiple 129 * mapping table entries that refer to, and hence claim, the same group 130 * or pin, and each of these will increment the @usecount. 131 * @mux_owner: The name of device that called pinctrl_get(). 132 * @mux_setting: The most recent selected mux setting for this pin, if any. 133 * @gpio_owner: If pinctrl_request_gpio() was called for this pin, this is 134 * the name of the GPIO that "owns" this pin. 135 */ 136 struct pin_desc { 137 struct pinctrl_dev *pctldev; 138 const char *name; 139 bool dynamic_name; 140 /* These fields only added when supporting pinmux drivers */ 141 #ifdef CONFIG_PINMUX 142 unsigned mux_usecount; 143 const char *mux_owner; 144 const struct pinctrl_setting_mux *mux_setting; 145 const char *gpio_owner; 146 #endif 147 }; 148 149 struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name); 150 int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name); 151 const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin); 152 int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, 153 const char *pin_group); 154 155 static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, 156 unsigned int pin) 157 { 158 return radix_tree_lookup(&pctldev->pin_desc_tree, pin); 159 } 160 161 int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps, 162 bool dup, bool locked); 163 void pinctrl_unregister_map(struct pinctrl_map const *map); 164 165 extern struct mutex pinctrl_mutex; 166 extern struct list_head pinctrldev_list; 167