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/kref.h> 13 #include <linux/mutex.h> 14 #include <linux/radix-tree.h> 15 #include <linux/pinctrl/pinconf.h> 16 #include <linux/pinctrl/machine.h> 17 18 struct pinctrl_gpio_range; 19 20 /** 21 * struct pinctrl_dev - pin control class device 22 * @node: node to include this pin controller in the global pin controller list 23 * @desc: the pin controller descriptor supplied when initializing this pin 24 * controller 25 * @pin_desc_tree: each pin descriptor for this pin controller is stored in 26 * this radix tree 27 * @gpio_ranges: a list of GPIO ranges that is handled by this pin controller, 28 * ranges are added to this list at runtime 29 * @dev: the device entry for this pin controller 30 * @owner: module providing the pin controller, used for refcounting 31 * @driver_data: driver data for drivers registering to the pin controller 32 * subsystem 33 * @p: result of pinctrl_get() for this device 34 * @hog_default: default state for pins hogged by this device 35 * @hog_sleep: sleep state for pins hogged by this device 36 * @mutex: mutex taken on each pin controller specific action 37 * @device_root: debugfs root for this device 38 */ 39 struct pinctrl_dev { 40 struct list_head node; 41 struct pinctrl_desc *desc; 42 struct radix_tree_root pin_desc_tree; 43 struct list_head gpio_ranges; 44 struct device *dev; 45 struct module *owner; 46 void *driver_data; 47 struct pinctrl *p; 48 struct pinctrl_state *hog_default; 49 struct pinctrl_state *hog_sleep; 50 struct mutex mutex; 51 #ifdef CONFIG_DEBUG_FS 52 struct dentry *device_root; 53 #endif 54 }; 55 56 /** 57 * struct pinctrl - per-device pin control state holder 58 * @node: global list node 59 * @dev: the device using this pin control handle 60 * @states: a list of states for this device 61 * @state: the current state 62 * @dt_maps: the mapping table chunks dynamically parsed from device tree for 63 * this device, if any 64 * @users: reference count 65 */ 66 struct pinctrl { 67 struct list_head node; 68 struct device *dev; 69 struct list_head states; 70 struct pinctrl_state *state; 71 struct list_head dt_maps; 72 struct kref users; 73 }; 74 75 /** 76 * struct pinctrl_state - a pinctrl state for a device 77 * @node: list node for struct pinctrl's @states field 78 * @name: the name of this state 79 * @settings: a list of settings for this state 80 */ 81 struct pinctrl_state { 82 struct list_head node; 83 const char *name; 84 struct list_head settings; 85 }; 86 87 /** 88 * struct pinctrl_setting_mux - setting data for MAP_TYPE_MUX_GROUP 89 * @group: the group selector to program 90 * @func: the function selector to program 91 */ 92 struct pinctrl_setting_mux { 93 unsigned group; 94 unsigned func; 95 }; 96 97 /** 98 * struct pinctrl_setting_configs - setting data for MAP_TYPE_CONFIGS_* 99 * @group_or_pin: the group selector or pin ID to program 100 * @configs: a pointer to an array of config parameters/values to program into 101 * hardware. Each individual pin controller defines the format and meaning 102 * of config parameters. 103 * @num_configs: the number of entries in array @configs 104 */ 105 struct pinctrl_setting_configs { 106 unsigned group_or_pin; 107 unsigned long *configs; 108 unsigned num_configs; 109 }; 110 111 /** 112 * struct pinctrl_setting - an individual mux or config setting 113 * @node: list node for struct pinctrl_settings's @settings field 114 * @type: the type of setting 115 * @pctldev: pin control device handling to be programmed. Not used for 116 * PIN_MAP_TYPE_DUMMY_STATE. 117 * @dev_name: the name of the device using this state 118 * @data: Data specific to the setting type 119 */ 120 struct pinctrl_setting { 121 struct list_head node; 122 enum pinctrl_map_type type; 123 struct pinctrl_dev *pctldev; 124 const char *dev_name; 125 union { 126 struct pinctrl_setting_mux mux; 127 struct pinctrl_setting_configs configs; 128 } data; 129 }; 130 131 /** 132 * struct pin_desc - pin descriptor for each physical pin in the arch 133 * @pctldev: corresponding pin control device 134 * @name: a name for the pin, e.g. the name of the pin/pad/finger on a 135 * datasheet or such 136 * @dynamic_name: if the name of this pin was dynamically allocated 137 * @mux_usecount: If zero, the pin is not claimed, and @owner should be NULL. 138 * If non-zero, this pin is claimed by @owner. This field is an integer 139 * rather than a boolean, since pinctrl_get() might process multiple 140 * mapping table entries that refer to, and hence claim, the same group 141 * or pin, and each of these will increment the @usecount. 142 * @mux_owner: The name of device that called pinctrl_get(). 143 * @mux_setting: The most recent selected mux setting for this pin, if any. 144 * @gpio_owner: If pinctrl_request_gpio() was called for this pin, this is 145 * the name of the GPIO that "owns" this pin. 146 */ 147 struct pin_desc { 148 struct pinctrl_dev *pctldev; 149 const char *name; 150 bool dynamic_name; 151 /* These fields only added when supporting pinmux drivers */ 152 #ifdef CONFIG_PINMUX 153 unsigned mux_usecount; 154 const char *mux_owner; 155 const struct pinctrl_setting_mux *mux_setting; 156 const char *gpio_owner; 157 #endif 158 }; 159 160 /** 161 * struct pinctrl_maps - a list item containing part of the mapping table 162 * @node: mapping table list node 163 * @maps: array of mapping table entries 164 * @num_maps: the number of entries in @maps 165 */ 166 struct pinctrl_maps { 167 struct list_head node; 168 struct pinctrl_map const *maps; 169 unsigned num_maps; 170 }; 171 172 struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name); 173 struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np); 174 int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name); 175 const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin); 176 int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, 177 const char *pin_group); 178 179 static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, 180 unsigned int pin) 181 { 182 return radix_tree_lookup(&pctldev->pin_desc_tree, pin); 183 } 184 185 int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps, 186 bool dup, bool locked); 187 void pinctrl_unregister_map(struct pinctrl_map const *map); 188 189 extern int pinctrl_force_sleep(struct pinctrl_dev *pctldev); 190 extern int pinctrl_force_default(struct pinctrl_dev *pctldev); 191 192 extern struct mutex pinctrl_maps_mutex; 193 extern struct list_head pinctrl_maps; 194 195 #define for_each_maps(_maps_node_, _i_, _map_) \ 196 list_for_each_entry(_maps_node_, &pinctrl_maps, node) \ 197 for (_i_ = 0, _map_ = &_maps_node_->maps[_i_]; \ 198 _i_ < _maps_node_->num_maps; \ 199 _i_++, _map_ = &_maps_node_->maps[_i_]) 200