core.h revision 652162d469a73450a66b6c8049b16c2b7828fa24 
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 */
56struct pinctrl {
57	struct list_head node;
58	struct device *dev;
59	struct list_head states;
60	struct pinctrl_state *state;
61};
62
63/**
64 * struct pinctrl_state - a pinctrl state for a device
65 * @node: list not for struct pinctrl's @states field
66 * @name: the name of this state
67 * @settings: a list of settings for this state
68 */
69struct pinctrl_state {
70	struct list_head node;
71	const char *name;
72	struct list_head settings;
73};
74
75/**
76 * struct pinctrl_setting_mux - setting data for MAP_TYPE_MUX_GROUP
77 * @group: the group selector to program
78 * @func: the function selector to program
79 */
80struct pinctrl_setting_mux {
81	unsigned group;
82	unsigned func;
83};
84
85/**
86 * struct pinctrl_setting_configs - setting data for MAP_TYPE_CONFIGS_*
87 * @group_or_pin: the group selector or pin ID to program
88 * @configs: a pointer to an array of config parameters/values to program into
89 *	hardware. Each individual pin controller defines the format and meaning
90 *	of config parameters.
91 * @num_configs: the number of entries in array @configs
92 */
93struct pinctrl_setting_configs {
94	unsigned group_or_pin;
95	unsigned long *configs;
96	unsigned num_configs;
97};
98
99/**
100 * struct pinctrl_setting - an individual mux or config setting
101 * @node: list node for struct pinctrl_settings's @settings field
102 * @type: the type of setting
103 * @pctldev: pin control device handling to be programmed
104 * @data: Data specific to the setting type
105 */
106struct pinctrl_setting {
107	struct list_head node;
108	enum pinctrl_map_type type;
109	struct pinctrl_dev *pctldev;
110	union {
111		struct pinctrl_setting_mux mux;
112		struct pinctrl_setting_configs configs;
113	} data;
114};
115
116/**
117 * struct pin_desc - pin descriptor for each physical pin in the arch
118 * @pctldev: corresponding pin control device
119 * @name: a name for the pin, e.g. the name of the pin/pad/finger on a
120 *	datasheet or such
121 * @dynamic_name: if the name of this pin was dynamically allocated
122 * @mux_usecount: If zero, the pin is not claimed, and @owner should be NULL.
123 *	If non-zero, this pin is claimed by @owner. This field is an integer
124 *	rather than a boolean, since pinctrl_get() might process multiple
125 *	mapping table entries that refer to, and hence claim, the same group
126 *	or pin, and each of these will increment the @usecount.
127 * @mux_owner: The name of device that called pinctrl_get().
128 * @mux_setting: The most recent selected mux setting for this pin, if any.
129 * @gpio_owner: If pinctrl_request_gpio() was called for this pin, this is
130 *	the name of the GPIO that "owns" this pin.
131 */
132struct pin_desc {
133	struct pinctrl_dev *pctldev;
134	const char *name;
135	bool dynamic_name;
136	/* These fields only added when supporting pinmux drivers */
137#ifdef CONFIG_PINMUX
138	unsigned mux_usecount;
139	const char *mux_owner;
140	const struct pinctrl_setting_mux *mux_setting;
141	const char *gpio_owner;
142#endif
143};
144
145struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name);
146int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name);
147int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
148			       const char *pin_group);
149
150static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev,
151					    unsigned int pin)
152{
153	return radix_tree_lookup(&pctldev->pin_desc_tree, pin);
154}
155
156extern struct mutex pinctrl_mutex;
157