Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 7f34167a0405f6f79b913ef9bcfaff98c2383f5a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Core private header for the pin control subsystem
 *
 * Copyright (C) 2011 ST-Ericsson SA
 * Written on behalf of Linaro for ST-Ericsson
 *
 * Author: Linus Walleij <linus.walleij@linaro.org>
 */

#include <linux/kref.h>
#include <linux/mutex.h>
#include <linux/radix-tree.h>
#include <linux/pinctrl/pinconf.h>
#include <linux/pinctrl/machine.h>

struct pinctrl_gpio_range;

/**
 * struct pinctrl_dev - pin control class device
 * @node: node to include this pin controller in the global pin controller list
 * @desc: the pin controller descriptor supplied when initializing this pin
 *	controller
 * @pin_desc_tree: each pin descriptor for this pin controller is stored in
 *	this radix tree
 * @pin_group_tree: optionally each pin group can be stored in this radix tree
 * @num_groups: optionally number of groups can be kept here
 * @pin_function_tree: optionally each function can be stored in this radix tree
 * @num_functions: optionally number of functions can be kept here
 * @gpio_ranges: a list of GPIO ranges that is handled by this pin controller,
 *	ranges are added to this list at runtime
 * @dev: the device entry for this pin controller
 * @owner: module providing the pin controller, used for refcounting
 * @driver_data: driver data for drivers registering to the pin controller
 *	subsystem
 * @p: result of pinctrl_get() for this device
 * @hog_default: default state for pins hogged by this device
 * @hog_sleep: sleep state for pins hogged by this device
 * @mutex: mutex taken on each pin controller specific action
 * @device_root: debugfs root for this device
 */
struct pinctrl_dev {
	struct list_head node;
	struct pinctrl_desc *desc;
	struct radix_tree_root pin_desc_tree;
#ifdef CONFIG_GENERIC_PINCTRL_GROUPS
	struct radix_tree_root pin_group_tree;
	unsigned int num_groups;
#endif
#ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS
	struct radix_tree_root pin_function_tree;
	unsigned int num_functions;
#endif
	struct list_head gpio_ranges;
	struct device *dev;
	struct module *owner;
	void *driver_data;
	struct pinctrl *p;
	struct pinctrl_state *hog_default;
	struct pinctrl_state *hog_sleep;
	struct mutex mutex;
#ifdef CONFIG_DEBUG_FS
	struct dentry *device_root;
#endif
};

/**
 * struct pinctrl - per-device pin control state holder
 * @node: global list node
 * @dev: the device using this pin control handle
 * @states: a list of states for this device
 * @state: the current state
 * @dt_maps: the mapping table chunks dynamically parsed from device tree for
 *	this device, if any
 * @users: reference count
 */
struct pinctrl {
	struct list_head node;
	struct device *dev;
	struct list_head states;
	struct pinctrl_state *state;
	struct list_head dt_maps;
	struct kref users;
};

/**
 * struct pinctrl_state - a pinctrl state for a device
 * @node: list node for struct pinctrl's @states field
 * @name: the name of this state
 * @settings: a list of settings for this state
 */
struct pinctrl_state {
	struct list_head node;
	const char *name;
	struct list_head settings;
};

/**
 * struct pinctrl_setting_mux - setting data for MAP_TYPE_MUX_GROUP
 * @group: the group selector to program
 * @func: the function selector to program
 */
struct pinctrl_setting_mux {
	unsigned group;
	unsigned func;
};

/**
 * struct pinctrl_setting_configs - setting data for MAP_TYPE_CONFIGS_*
 * @group_or_pin: the group selector or pin ID to program
 * @configs: a pointer to an array of config parameters/values to program into
 *	hardware. Each individual pin controller defines the format and meaning
 *	of config parameters.
 * @num_configs: the number of entries in array @configs
 */
struct pinctrl_setting_configs {
	unsigned group_or_pin;
	unsigned long *configs;
	unsigned num_configs;
};

/**
 * struct pinctrl_setting - an individual mux or config setting
 * @node: list node for struct pinctrl_settings's @settings field
 * @type: the type of setting
 * @pctldev: pin control device handling to be programmed. Not used for
 *   PIN_MAP_TYPE_DUMMY_STATE.
 * @dev_name: the name of the device using this state
 * @data: Data specific to the setting type
 */
struct pinctrl_setting {
	struct list_head node;
	enum pinctrl_map_type type;
	struct pinctrl_dev *pctldev;
	const char *dev_name;
	union {
		struct pinctrl_setting_mux mux;
		struct pinctrl_setting_configs configs;
	} data;
};

/**
 * struct pin_desc - pin descriptor for each physical pin in the arch
 * @pctldev: corresponding pin control device
 * @name: a name for the pin, e.g. the name of the pin/pad/finger on a
 *	datasheet or such
 * @dynamic_name: if the name of this pin was dynamically allocated
 * @drv_data: driver-defined per-pin data. pinctrl core does not touch this
 * @mux_usecount: If zero, the pin is not claimed, and @owner should be NULL.
 *	If non-zero, this pin is claimed by @owner. This field is an integer
 *	rather than a boolean, since pinctrl_get() might process multiple
 *	mapping table entries that refer to, and hence claim, the same group
 *	or pin, and each of these will increment the @usecount.
 * @mux_owner: The name of device that called pinctrl_get().
 * @mux_setting: The most recent selected mux setting for this pin, if any.
 * @gpio_owner: If pinctrl_gpio_request() was called for this pin, this is
 *	the name of the GPIO that "owns" this pin.
 */
struct pin_desc {
	struct pinctrl_dev *pctldev;
	const char *name;
	bool dynamic_name;
	void *drv_data;
	/* These fields only added when supporting pinmux drivers */
#ifdef CONFIG_PINMUX
	unsigned mux_usecount;
	const char *mux_owner;
	const struct pinctrl_setting_mux *mux_setting;
	const char *gpio_owner;
#endif
};

/**
 * struct pinctrl_maps - a list item containing part of the mapping table
 * @node: mapping table list node
 * @maps: array of mapping table entries
 * @num_maps: the number of entries in @maps
 */
struct pinctrl_maps {
	struct list_head node;
	const struct pinctrl_map *maps;
	unsigned num_maps;
};

#ifdef CONFIG_GENERIC_PINCTRL_GROUPS

/**
 * struct group_desc - generic pin group descriptor
 * @name: name of the pin group
 * @pins: array of pins that belong to the group
 * @num_pins: number of pins in the group
 * @data: pin controller driver specific data
 */
struct group_desc {
	const char *name;
	int *pins;
	int num_pins;
	void *data;
};

int pinctrl_generic_get_group_count(struct pinctrl_dev *pctldev);

const char *pinctrl_generic_get_group_name(struct pinctrl_dev *pctldev,
					   unsigned int group_selector);

int pinctrl_generic_get_group_pins(struct pinctrl_dev *pctldev,
				   unsigned int group_selector,
				   const unsigned int **pins,
				   unsigned int *npins);

struct group_desc *pinctrl_generic_get_group(struct pinctrl_dev *pctldev,
					     unsigned int group_selector);

int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name,
			      int *gpins, int ngpins, void *data);

int pinctrl_generic_remove_group(struct pinctrl_dev *pctldev,
				 unsigned int group_selector);

#endif	/* CONFIG_GENERIC_PINCTRL_GROUPS */

struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *dev_name);
struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np);
int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name);
const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin);
int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
			       const char *pin_group);

static inline struct pin_desc *pin_desc_get(struct pinctrl_dev *pctldev,
					    unsigned int pin)
{
	return radix_tree_lookup(&pctldev->pin_desc_tree, pin);
}

extern struct pinctrl_gpio_range *
pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev,
					unsigned int pin);

int pinctrl_register_map(const struct pinctrl_map *maps, unsigned num_maps,
			 bool dup);
void pinctrl_unregister_map(const struct pinctrl_map *map);

extern int pinctrl_force_sleep(struct pinctrl_dev *pctldev);
extern int pinctrl_force_default(struct pinctrl_dev *pctldev);

extern struct mutex pinctrl_maps_mutex;
extern struct list_head pinctrl_maps;

#define for_each_maps(_maps_node_, _i_, _map_) \
	list_for_each_entry(_maps_node_, &pinctrl_maps, node) \
		for (_i_ = 0, _map_ = &_maps_node_->maps[_i_]; \
			_i_ < _maps_node_->num_maps; \
			_i_++, _map_ = &_maps_node_->maps[_i_])