1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Interface the pinctrl subsystem
4 *
5 * Copyright (C) 2011 ST-Ericsson SA
6 * Written on behalf of Linaro for ST-Ericsson
7 * This interface is used in the core to keep track of pins.
8 *
9 * Author: Linus Walleij <linus.walleij@linaro.org>
10 */
11 #ifndef __LINUX_PINCTRL_PINCTRL_H
12 #define __LINUX_PINCTRL_PINCTRL_H
13
14 #include <linux/bits.h>
15 #include <linux/types.h>
16
17 struct device;
18 struct device_node;
19 struct gpio_chip;
20 struct module;
21 struct seq_file;
22
23 struct pin_config_item;
24 struct pinconf_generic_params;
25 struct pinconf_ops;
26 struct pinctrl_dev;
27 struct pinctrl_map;
28 struct pinmux_ops;
29
30 /**
31 * struct pingroup - provides information on pingroup
32 * @name: a name for pingroup
33 * @pins: an array of pins in the pingroup
34 * @npins: number of pins in the pingroup
35 */
36 struct pingroup {
37 const char *name;
38 const unsigned int *pins;
39 size_t npins;
40 };
41
42 /* Convenience macro to define a single named or anonymous pingroup */
43 #define PINCTRL_PINGROUP(_name, _pins, _npins) \
44 (struct pingroup) { \
45 .name = _name, \
46 .pins = _pins, \
47 .npins = _npins, \
48 }
49
50 /**
51 * struct pinctrl_pin_desc - boards/machines provide information on their
52 * pins, pads or other muxable units in this struct
53 * @number: unique pin number from the global pin number space
54 * @name: a name for this pin
55 * @drv_data: driver-defined per-pin data. pinctrl core does not touch this
56 */
57 struct pinctrl_pin_desc {
58 unsigned int number;
59 const char *name;
60 void *drv_data;
61 };
62
63 /* Convenience macro to define a single named or anonymous pin descriptor */
64 #define PINCTRL_PIN(a, b) { .number = a, .name = b }
65 #define PINCTRL_PIN_ANON(a) { .number = a }
66
67 /**
68 * struct pinctrl_gpio_range - each pin controller can provide subranges of
69 * the GPIO number space to be handled by the controller
70 * @node: list node for internal use
71 * @name: a name for the chip in this range
72 * @id: an ID number for the chip in this range
73 * @base: base offset of the GPIO range
74 * @pin_base: base pin number of the GPIO range if pins == NULL
75 * @npins: number of pins in the GPIO range, including the base number
76 * @pins: enumeration of pins in GPIO range or NULL
77 * @gc: an optional pointer to a gpio_chip
78 */
79 struct pinctrl_gpio_range {
80 struct list_head node;
81 const char *name;
82 unsigned int id;
83 unsigned int base;
84 unsigned int pin_base;
85 unsigned int npins;
86 unsigned int const *pins;
87 struct gpio_chip *gc;
88 };
89
90 /**
91 * struct pinctrl_ops - global pin control operations, to be implemented by
92 * pin controller drivers.
93 * @get_groups_count: Returns the count of total number of groups registered.
94 * @get_group_name: return the group name of the pin group
95 * @get_group_pins: return an array of pins corresponding to a certain
96 * group selector @pins, and the size of the array in @num_pins
97 * @pin_dbg_show: optional debugfs display hook that will provide per-device
98 * info for a certain pin in debugfs
99 * @dt_node_to_map: parse a device tree "pin configuration node", and create
100 * mapping table entries for it. These are returned through the @map and
101 * @num_maps output parameters. This function is optional, and may be
102 * omitted for pinctrl drivers that do not support device tree.
103 * @dt_free_map: free mapping table entries created via @dt_node_to_map. The
104 * top-level @map pointer must be freed, along with any dynamically
105 * allocated members of the mapping table entries themselves. This
106 * function is optional, and may be omitted for pinctrl drivers that do
107 * not support device tree.
108 */
109 struct pinctrl_ops {
110 int (*get_groups_count) (struct pinctrl_dev *pctldev);
111 const char *(*get_group_name) (struct pinctrl_dev *pctldev,
112 unsigned int selector);
113 int (*get_group_pins) (struct pinctrl_dev *pctldev,
114 unsigned int selector,
115 const unsigned int **pins,
116 unsigned int *num_pins);
117 void (*pin_dbg_show) (struct pinctrl_dev *pctldev, struct seq_file *s,
118 unsigned int offset);
119 int (*dt_node_to_map) (struct pinctrl_dev *pctldev,
120 struct device_node *np_config,
121 struct pinctrl_map **map, unsigned int *num_maps);
122 void (*dt_free_map) (struct pinctrl_dev *pctldev,
123 struct pinctrl_map *map, unsigned int num_maps);
124 };
125
126 /**
127 * struct pinctrl_desc - pin controller descriptor, register this to pin
128 * control subsystem
129 * @name: name for the pin controller
130 * @pins: an array of pin descriptors describing all the pins handled by
131 * this pin controller
132 * @npins: number of descriptors in the array, usually just ARRAY_SIZE()
133 * of the pins field above
134 * @pctlops: pin control operation vtable, to support global concepts like
135 * grouping of pins, this is optional.
136 * @pmxops: pinmux operations vtable, if you support pinmuxing in your driver
137 * @confops: pin config operations vtable, if you support pin configuration in
138 * your driver
139 * @owner: module providing the pin controller, used for refcounting
140 * @num_custom_params: Number of driver-specific custom parameters to be parsed
141 * from the hardware description
142 * @custom_params: List of driver_specific custom parameters to be parsed from
143 * the hardware description
144 * @custom_conf_items: Information how to print @params in debugfs, must be
145 * the same size as the @custom_params, i.e. @num_custom_params
146 * @link_consumers: If true create a device link between pinctrl and its
147 * consumers (i.e. the devices requesting pin control states). This is
148 * sometimes necessary to ascertain the right suspend/resume order for
149 * example.
150 */
151 struct pinctrl_desc {
152 const char *name;
153 const struct pinctrl_pin_desc *pins;
154 unsigned int npins;
155 const struct pinctrl_ops *pctlops;
156 const struct pinmux_ops *pmxops;
157 const struct pinconf_ops *confops;
158 struct module *owner;
159 #ifdef CONFIG_GENERIC_PINCONF
160 unsigned int num_custom_params;
161 const struct pinconf_generic_params *custom_params;
162 const struct pin_config_item *custom_conf_items;
163 #endif
164 bool link_consumers;
165 };
166
167 /* External interface to pin controller */
168
169 extern int pinctrl_register_and_init(const struct pinctrl_desc *pctldesc,
170 struct device *dev, void *driver_data,
171 struct pinctrl_dev **pctldev);
172 extern int pinctrl_enable(struct pinctrl_dev *pctldev);
173
174 /* Please use pinctrl_register_and_init() and pinctrl_enable() instead */
175 extern struct pinctrl_dev *pinctrl_register(const struct pinctrl_desc *pctldesc,
176 struct device *dev, void *driver_data);
177
178 extern void pinctrl_unregister(struct pinctrl_dev *pctldev);
179
180 extern int devm_pinctrl_register_and_init(struct device *dev,
181 const struct pinctrl_desc *pctldesc,
182 void *driver_data,
183 struct pinctrl_dev **pctldev);
184
185 /* Please use devm_pinctrl_register_and_init() instead */
186 extern struct pinctrl_dev *devm_pinctrl_register(struct device *dev,
187 const struct pinctrl_desc *pctldesc,
188 void *driver_data);
189
190 extern void devm_pinctrl_unregister(struct device *dev,
191 struct pinctrl_dev *pctldev);
192
193 extern void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
194 struct pinctrl_gpio_range *range);
195 extern void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
196 struct pinctrl_gpio_range *ranges,
197 unsigned int nranges);
198 extern void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
199 struct pinctrl_gpio_range *range);
200
201 extern struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
202 struct pinctrl_gpio_range *range);
203 extern struct pinctrl_gpio_range *
204 pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
205 unsigned int pin);
206 extern int pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
207 const char *pin_group, const unsigned int **pins,
208 unsigned int *num_pins);
209
210 #define PINFUNCTION_FLAG_GPIO BIT(0)
211
212 /**
213 * struct pinfunction - Description about a function
214 * @name: Name of the function
215 * @groups: An array of groups for this function
216 * @ngroups: Number of groups in @groups
217 * @flags: Additional pin function flags
218 */
219 struct pinfunction {
220 const char *name;
221 const char * const *groups;
222 size_t ngroups;
223 unsigned long flags;
224 };
225
226 /* Convenience macro to define a single named pinfunction */
227 #define PINCTRL_PINFUNCTION(_name, _groups, _ngroups) \
228 (struct pinfunction) { \
229 .name = (_name), \
230 .groups = (_groups), \
231 .ngroups = (_ngroups), \
232 }
233
234 /* Same as PINCTRL_PINFUNCTION() but for the GPIO category of functions */
235 #define PINCTRL_GPIO_PINFUNCTION(_name, _groups, _ngroups) \
236 (struct pinfunction) { \
237 .name = (_name), \
238 .groups = (_groups), \
239 .ngroups = (_ngroups), \
240 .flags = PINFUNCTION_FLAG_GPIO, \
241 }
242
243 #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_PINCTRL)
244 extern struct pinctrl_dev *of_pinctrl_get(struct device_node *np);
245 #else
246 static inline
of_pinctrl_get(struct device_node * np)247 struct pinctrl_dev *of_pinctrl_get(struct device_node *np)
248 {
249 return NULL;
250 }
251 #endif /* CONFIG_OF */
252
253 extern const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev);
254 extern const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev);
255 extern void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev);
256
257 #endif /* __LINUX_PINCTRL_PINCTRL_H */
258