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 * @pin_group_tree: optionally each pin group can be stored in this radix tree 28 * @num_groups: optionally number of groups can be kept here 29 * @pin_function_tree: optionally each function can be stored in this radix tree 30 * @num_functions: optionally number of functions can be kept here 31 * @gpio_ranges: a list of GPIO ranges that is handled by this pin controller, 32 * ranges are added to this list at runtime 33 * @dev: the device entry for this pin controller 34 * @owner: module providing the pin controller, used for refcounting 35 * @driver_data: driver data for drivers registering to the pin controller 36 * subsystem 37 * @p: result of pinctrl_get() for this device 38 * @hog_default: default state for pins hogged by this device 39 * @hog_sleep: sleep state for pins hogged by this device 40 * @mutex: mutex taken on each pin controller specific action 41 * @device_root: debugfs root for this device 42 */ 43 struct pinctrl_dev { 44 struct list_head node; 45 struct pinctrl_desc *desc; 46 struct radix_tree_root pin_desc_tree; 47 #ifdef CONFIG_GENERIC_PINCTRL_GROUPS 48 struct radix_tree_root pin_group_tree; 49 unsigned int num_groups; 50 #endif 51 #ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS 52 struct radix_tree_root pin_function_tree; 53 unsigned int num_functions; 54 #endif 55 struct list_head gpio_ranges; 56 struct device *dev; 57 struct module *owner; 58 void *driver_data; 59 struct pinctrl *p; 60 struct pinctrl_state *hog_default; 61 struct pinctrl_state *hog_sleep; 62 struct mutex mutex; 63 #ifdef CONFIG_DEBUG_FS 64 struct dentry *device_root; 65 #endif 66 }; 67 68 /** 69 * struct pinctrl - per-device pin control state holder 70 * @node: global list node 71 * @dev: the device using this pin control handle 72 * @states: a list of states for this device 73 * @state: the current state 74 * @dt_maps: the mapping table chunks dynamically parsed from device tree for 75 * this device, if any 76 * @users: reference count 77 */ 78 struct pinctrl { 79 struct list_head node; 80 struct device *dev; 81 struct list_head states; 82 struct pinctrl_state *state; 83 struct list_head dt_maps; 84 struct kref users; 85 }; 86 87 /** 88 * struct pinctrl_state - a pinctrl state for a device 89 * @node: list node for struct pinctrl's @states field 90 * @name: the name of this state 91 * @settings: a list of settings for this state 92 */ 93 struct pinctrl_state { 94 struct list_head node; 95 const char *name; 96 struct list_head settings; 97 }; 98 99 /** 100 * struct pinctrl_setting_mux - setting data for MAP_TYPE_MUX_GROUP 101 * @group: the group selector to program 102 * @func: the function selector to program 103 */ 104 struct pinctrl_setting_mux { 105 unsigned group; 106 unsigned func; 107 }; 108 109 /** 110 * struct pinctrl_setting_configs - setting data for MAP_TYPE_CONFIGS_* 111 * @group_or_pin: the group selector or pin ID to program 112 * @configs: a pointer to an array of config parameters/values to program into 113 * hardware. Each individual pin controller defines the format and meaning 114 * of config parameters. 115 * @num_configs: the number of entries in array @configs 116 */ 117 struct pinctrl_setting_configs { 118 unsigned group_or_pin; 119 unsigned long *configs; 120 unsigned num_configs; 121 }; 122 123 /** 124 * struct pinctrl_setting - an individual mux or config setting 125 * @node: list node for struct pinctrl_settings's @settings field 126 * @type: the type of setting 127 * @pctldev: pin control device handling to be programmed. Not used for 128 * PIN_MAP_TYPE_DUMMY_STATE. 129 * @dev_name: the name of the device using this state 130 * @data: Data specific to the setting type 131 */ 132 struct pinctrl_setting { 133 struct list_head node; 134 enum pinctrl_map_type type; 135 struct pinctrl_dev *pctldev; 136 const char *dev_name; 137 union { 138 struct pinctrl_setting_mux mux; 139 struct pinctrl_setting_configs configs; 140 } data; 141 }; 142 143 /** 144 * struct pin_desc - pin descriptor for each physical pin in the arch 145 * @pctldev: corresponding pin control device 146 * @name: a name for the pin, e.g. the name of the pin/pad/finger on a 147 * datasheet or such 148 * @dynamic_name: if the name of this pin was dynamically allocated 149 * @drv_data: driver-defined per-pin data. pinctrl core does not touch this 150 * @mux_usecount: If zero, the pin is not claimed, and @owner should be NULL. 151 * If non-zero, this pin is claimed by @owner. This field is an integer 152 * rather than a boolean, since pinctrl_get() might process multiple 153 * mapping table entries that refer to, and hence claim, the same group 154 * or pin, and each of these will increment the @usecount. 155 * @mux_owner: The name of device that called pinctrl_get(). 156 * @mux_setting: The most recent selected mux setting for this pin, if any. 157 * @gpio_owner: If pinctrl_request_gpio() was called for this pin, this is 158 * the name of the GPIO that "owns" this pin. 159 */ 160 struct pin_desc { 161 struct pinctrl_dev *pctldev; 162 const char *name; 163 bool dynamic_name; 164 void *drv_data; 165 /* These fields only added when supporting pinmux drivers */ 166 #ifdef CONFIG_PINMUX 167 unsigned mux_usecount; 168 const char *mux_owner; 169 const struct pinctrl_setting_mux *mux_setting; 170 const char *gpio_owner; 171 #endif 172 }; 173 174 /** 175 * struct pinctrl_maps - a list item containing part of the mapping table 176 * @node: mapping table list node 177 * @maps: array of mapping table entries 178 * @num_maps: the number of entries in @maps 179 */ 180 struct pinctrl_maps { 181 struct list_head node; 182 struct pinctrl_map const *maps; 183 unsigned num_maps; 184 }; 185 186 #ifdef CONFIG_GENERIC_PINCTRL_GROUPS 187 188 /** 189 * struct group_desc - generic pin group descriptor 190 * @name: name of the pin group 191 * @pins: array of pins that belong to the group 192 * @num_pins: number of pins in the group 193 * @data: pin controller driver specific data 194 */ 195 struct group_desc { 196 const char *name; 197 int *pins; 198 int num_pins; 199 void *data; 200 }; 201 202 int pinctrl_generic_get_group_count(struct pinctrl_dev *pctldev); 203 204 const char *pinctrl_generic_get_group_name(struct pinctrl_dev *pctldev, 205 unsigned int group_selector); 206 207 int pinctrl_generic_get_group_pins(struct pinctrl_dev *pctldev, 208 unsigned int group_selector, 209 const unsigned int **pins, 210 unsigned int *npins); 211 212 struct group_desc *pinctrl_generic_get_group(struct pinctrl_dev *pctldev, 213 unsigned int group_selector); 214 215 int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name, 216 int *gpins, int ngpins, void *data); 217 218 int pinctrl_generic_remove_group(struct pinctrl_dev *pctldev, 219 unsigned int group_selector); 220 221 static inline int 222 pinctrl_generic_remove_last_group(struct pinctrl_dev *pctldev) 223 { 224 return pinctrl_generic_remove_group(pctldev, pctldev->num_groups - 1); 225 } 226 227 #endif /* CONFIG_GENERIC_PINCTRL_GROUPS */ 228 229 struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name); 230 struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np); 231 int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name); 232 const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin); 233 int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, 234 const char *pin_group); 235 236 static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, 237 unsigned int pin) 238 { 239 return radix_tree_lookup(&pctldev->pin_desc_tree, pin); 240 } 241 242 extern struct pinctrl_gpio_range * 243 pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev, 244 unsigned int pin); 245 246 int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps, 247 bool dup); 248 void pinctrl_unregister_map(struct pinctrl_map const *map); 249 250 extern int pinctrl_force_sleep(struct pinctrl_dev *pctldev); 251 extern int pinctrl_force_default(struct pinctrl_dev *pctldev); 252 253 extern struct mutex pinctrl_maps_mutex; 254 extern struct list_head pinctrl_maps; 255 256 #define for_each_maps(_maps_node_, _i_, _map_) \ 257 list_for_each_entry(_maps_node_, &pinctrl_maps, node) \ 258 for (_i_ = 0, _map_ = &_maps_node_->maps[_i_]; \ 259 _i_ < _maps_node_->num_maps; \ 260 _i_++, _map_ = &_maps_node_->maps[_i_]) 261