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2744e8af LW |
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 | ||
57b676f9 SW |
12 | #include <linux/mutex.h> |
13 | #include <linux/radix-tree.h> | |
ae6b4d85 LW |
14 | #include <linux/pinctrl/pinconf.h> |
15 | ||
16 | struct pinctrl_gpio_range; | |
17 | ||
2744e8af LW |
18 | /** |
19 | * struct pinctrl_dev - pin control class device | |
20 | * @node: node to include this pin controller in the global pin controller list | |
21 | * @desc: the pin controller descriptor supplied when initializing this pin | |
22 | * controller | |
23 | * @pin_desc_tree: each pin descriptor for this pin controller is stored in | |
24 | * this radix tree | |
2744e8af LW |
25 | * @gpio_ranges: a list of GPIO ranges that is handled by this pin controller, |
26 | * ranges are added to this list at runtime | |
2744e8af LW |
27 | * @dev: the device entry for this pin controller |
28 | * @owner: module providing the pin controller, used for refcounting | |
29 | * @driver_data: driver data for drivers registering to the pin controller | |
30 | * subsystem | |
46919ae6 | 31 | * @p: result of pinctrl_get() for this device |
befe5bdf | 32 | * @device_root: debugfs root for this device |
2744e8af LW |
33 | */ |
34 | struct pinctrl_dev { | |
35 | struct list_head node; | |
36 | struct pinctrl_desc *desc; | |
37 | struct radix_tree_root pin_desc_tree; | |
2744e8af | 38 | struct list_head gpio_ranges; |
51cd24ee | 39 | struct device *dev; |
2744e8af LW |
40 | struct module *owner; |
41 | void *driver_data; | |
46919ae6 | 42 | struct pinctrl *p; |
02157160 TL |
43 | #ifdef CONFIG_DEBUG_FS |
44 | struct dentry *device_root; | |
45 | #endif | |
befe5bdf LW |
46 | }; |
47 | ||
48 | /** | |
49 | * struct pinctrl - per-device pin control state holder | |
50 | * @node: global list node | |
51 | * @dev: the device using this pin control handle | |
7ecdb16f | 52 | * @state: the state name passed to pinctrl_get() |
befe5bdf LW |
53 | * @usecount: the number of active users of this pin controller setting, used |
54 | * to keep track of nested use cases | |
7ecdb16f | 55 | * @settings: a list of settings for this device/state |
befe5bdf LW |
56 | */ |
57 | struct pinctrl { | |
58 | struct list_head node; | |
59 | struct device *dev; | |
7ecdb16f | 60 | const char *state; |
befe5bdf | 61 | unsigned usecount; |
7ecdb16f SW |
62 | struct list_head settings; |
63 | }; | |
64 | ||
65 | /** | |
66 | * struct pinctrl_setting - an individual mux setting | |
67 | * @node: list node for struct pinctrl's @settings field | |
68 | * @pctldev: pin control device handling to be programmed | |
69 | * @group_selector: the group selector to program | |
70 | * @func_selector: the function selector to program | |
71 | */ | |
72 | struct pinctrl_setting { | |
73 | struct list_head node; | |
befe5bdf | 74 | struct pinctrl_dev *pctldev; |
7ecdb16f SW |
75 | unsigned group_selector; |
76 | unsigned func_selector; | |
2744e8af LW |
77 | }; |
78 | ||
79 | /** | |
80 | * struct pin_desc - pin descriptor for each physical pin in the arch | |
81 | * @pctldev: corresponding pin control device | |
82 | * @name: a name for the pin, e.g. the name of the pin/pad/finger on a | |
83 | * datasheet or such | |
ca53c5f1 | 84 | * @dynamic_name: if the name of this pin was dynamically allocated |
0e3db173 SW |
85 | * @usecount: If zero, the pin is not claimed, and @owner should be NULL. |
86 | * If non-zero, this pin is claimed by @owner. This field is an integer | |
87 | * rather than a boolean, since pinctrl_get() might process multiple | |
88 | * mapping table entries that refer to, and hence claim, the same group | |
89 | * or pin, and each of these will increment the @usecount. | |
90 | * @owner: The name of the entity owning the pin. Typically, this is the name | |
91 | * of the device that called pinctrl_get(). Alternatively, it may be the | |
92 | * name of the GPIO passed to pinctrl_request_gpio(). | |
2744e8af LW |
93 | */ |
94 | struct pin_desc { | |
95 | struct pinctrl_dev *pctldev; | |
9af1e44f | 96 | const char *name; |
ca53c5f1 | 97 | bool dynamic_name; |
2744e8af LW |
98 | /* These fields only added when supporting pinmux drivers */ |
99 | #ifdef CONFIG_PINMUX | |
0e3db173 | 100 | unsigned usecount; |
3cc70ed3 | 101 | const char *owner; |
2744e8af LW |
102 | #endif |
103 | }; | |
104 | ||
9dfac4fd | 105 | struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name); |
ae6b4d85 | 106 | int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name); |
7afde8ba LW |
107 | int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, |
108 | const char *pin_group); | |
2304b473 SW |
109 | |
110 | static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev, | |
111 | unsigned int pin) | |
112 | { | |
113 | return radix_tree_lookup(&pctldev->pin_desc_tree, pin); | |
114 | } | |
57b676f9 SW |
115 | |
116 | extern struct mutex pinctrl_mutex; |