Root/drivers/pinctrl/core.h

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
17struct 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 */
35struct 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 */
58struct 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 */
72struct 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 */
83struct 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 */
96struct 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 */
110struct 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 */
136struct 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
149struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name);
150int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name);
151const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin);
152int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
153                   const char *pin_group);
154
155static 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
161int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps,
162             bool dup, bool locked);
163void pinctrl_unregister_map(struct pinctrl_map const *map);
164
165extern struct mutex pinctrl_mutex;
166extern struct list_head pinctrldev_list;
167

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