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664e3e5a MW |
1 | /* |
2 | * Internal GPIO functions. | |
3 | * | |
4 | * Copyright (C) 2013, Intel Corporation | |
5 | * Author: Mika Westerberg <mika.westerberg@linux.intel.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #ifndef GPIOLIB_H | |
13 | #define GPIOLIB_H | |
14 | ||
5ccff852 MW |
15 | #include <linux/err.h> |
16 | #include <linux/device.h> | |
17 | ||
f01d9075 AC |
18 | enum of_gpio_flags; |
19 | ||
ce793486 RW |
20 | struct acpi_device; |
21 | ||
5ccff852 MW |
22 | /** |
23 | * struct acpi_gpio_info - ACPI GPIO specific information | |
24 | * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo | |
25 | * @active_low: in case of @gpioint, the pin is active low | |
26 | */ | |
27 | struct acpi_gpio_info { | |
28 | bool gpioint; | |
52044723 CR |
29 | int polarity; |
30 | int triggering; | |
5ccff852 MW |
31 | }; |
32 | ||
7f2e553a RI |
33 | /* gpio suffixes used for ACPI and device tree lookup */ |
34 | static const char * const gpio_suffixes[] = { "gpios", "gpio" }; | |
35 | ||
664e3e5a MW |
36 | #ifdef CONFIG_ACPI |
37 | void acpi_gpiochip_add(struct gpio_chip *chip); | |
38 | void acpi_gpiochip_remove(struct gpio_chip *chip); | |
5ccff852 | 39 | |
afa82fab MW |
40 | void acpi_gpiochip_request_interrupts(struct gpio_chip *chip); |
41 | void acpi_gpiochip_free_interrupts(struct gpio_chip *chip); | |
42 | ||
0d9a693c MW |
43 | struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, |
44 | const char *propname, int index, | |
5ccff852 | 45 | struct acpi_gpio_info *info); |
504a3374 RW |
46 | struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode, |
47 | const char *propname, int index, | |
48 | struct acpi_gpio_info *info); | |
66858527 RI |
49 | |
50 | int acpi_gpio_count(struct device *dev, const char *con_id); | |
10cf4899 DT |
51 | |
52 | bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id); | |
664e3e5a MW |
53 | #else |
54 | static inline void acpi_gpiochip_add(struct gpio_chip *chip) { } | |
55 | static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { } | |
5ccff852 | 56 | |
afa82fab MW |
57 | static inline void |
58 | acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { } | |
59 | ||
60 | static inline void | |
61 | acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { } | |
62 | ||
5ccff852 | 63 | static inline struct gpio_desc * |
0d9a693c MW |
64 | acpi_get_gpiod_by_index(struct acpi_device *adev, const char *propname, |
65 | int index, struct acpi_gpio_info *info) | |
5ccff852 MW |
66 | { |
67 | return ERR_PTR(-ENOSYS); | |
68 | } | |
504a3374 RW |
69 | static inline struct gpio_desc * |
70 | acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname, | |
71 | int index, struct acpi_gpio_info *info) | |
72 | { | |
73 | return ERR_PTR(-ENXIO); | |
74 | } | |
66858527 RI |
75 | static inline int acpi_gpio_count(struct device *dev, const char *con_id) |
76 | { | |
77 | return -ENODEV; | |
78 | } | |
10cf4899 DT |
79 | |
80 | static inline bool acpi_can_fallback_to_crs(struct acpi_device *adev, | |
81 | const char *con_id) | |
82 | { | |
83 | return false; | |
84 | } | |
664e3e5a MW |
85 | #endif |
86 | ||
f01d9075 AC |
87 | struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np, |
88 | const char *list_name, int index, enum of_gpio_flags *flags); | |
89 | ||
1bd6b601 AC |
90 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum); |
91 | ||
0eb4c6c2 AC |
92 | extern struct spinlock gpio_lock; |
93 | extern struct list_head gpio_chips; | |
94 | ||
95 | struct gpio_desc { | |
96 | struct gpio_chip *chip; | |
97 | unsigned long flags; | |
98 | /* flag symbols are bit numbers */ | |
99 | #define FLAG_REQUESTED 0 | |
100 | #define FLAG_IS_OUT 1 | |
101 | #define FLAG_EXPORT 2 /* protected by sysfs_lock */ | |
102 | #define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */ | |
0eb4c6c2 AC |
103 | #define FLAG_ACTIVE_LOW 6 /* value has active low */ |
104 | #define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */ | |
105 | #define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */ | |
106 | #define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */ | |
f625d460 | 107 | #define FLAG_IS_HOGGED 11 /* GPIO is hogged */ |
0eb4c6c2 | 108 | |
c0017ed7 | 109 | /* Connection label */ |
0eb4c6c2 | 110 | const char *label; |
c0017ed7 MP |
111 | /* Name of the GPIO */ |
112 | const char *name; | |
0eb4c6c2 AC |
113 | }; |
114 | ||
115 | int gpiod_request(struct gpio_desc *desc, const char *label); | |
116 | void gpiod_free(struct gpio_desc *desc); | |
f625d460 BP |
117 | int gpiod_hog(struct gpio_desc *desc, const char *name, |
118 | unsigned long lflags, enum gpiod_flags dflags); | |
0eb4c6c2 AC |
119 | |
120 | /* | |
121 | * Return the GPIO number of the passed descriptor relative to its chip | |
122 | */ | |
123 | static int __maybe_unused gpio_chip_hwgpio(const struct gpio_desc *desc) | |
124 | { | |
125 | return desc - &desc->chip->desc[0]; | |
126 | } | |
127 | ||
128 | /* With descriptor prefix */ | |
129 | ||
130 | #define gpiod_emerg(desc, fmt, ...) \ | |
131 | pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\ | |
132 | ##__VA_ARGS__) | |
133 | #define gpiod_crit(desc, fmt, ...) \ | |
134 | pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ | |
135 | ##__VA_ARGS__) | |
136 | #define gpiod_err(desc, fmt, ...) \ | |
137 | pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ | |
138 | ##__VA_ARGS__) | |
139 | #define gpiod_warn(desc, fmt, ...) \ | |
140 | pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ | |
141 | ##__VA_ARGS__) | |
142 | #define gpiod_info(desc, fmt, ...) \ | |
143 | pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ | |
144 | ##__VA_ARGS__) | |
145 | #define gpiod_dbg(desc, fmt, ...) \ | |
146 | pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\ | |
147 | ##__VA_ARGS__) | |
148 | ||
149 | /* With chip prefix */ | |
150 | ||
151 | #define chip_emerg(chip, fmt, ...) \ | |
152 | pr_emerg("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) | |
153 | #define chip_crit(chip, fmt, ...) \ | |
154 | pr_crit("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) | |
155 | #define chip_err(chip, fmt, ...) \ | |
156 | pr_err("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) | |
157 | #define chip_warn(chip, fmt, ...) \ | |
158 | pr_warn("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) | |
159 | #define chip_info(chip, fmt, ...) \ | |
160 | pr_info("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) | |
161 | #define chip_dbg(chip, fmt, ...) \ | |
162 | pr_debug("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) | |
163 | ||
164 | #ifdef CONFIG_GPIO_SYSFS | |
165 | ||
426577bd JH |
166 | int gpiochip_sysfs_register(struct gpio_chip *chip); |
167 | void gpiochip_sysfs_unregister(struct gpio_chip *chip); | |
0eb4c6c2 AC |
168 | |
169 | #else | |
170 | ||
426577bd | 171 | static inline int gpiochip_sysfs_register(struct gpio_chip *chip) |
0eb4c6c2 AC |
172 | { |
173 | return 0; | |
174 | } | |
175 | ||
426577bd | 176 | static inline void gpiochip_sysfs_unregister(struct gpio_chip *chip) |
0eb4c6c2 AC |
177 | { |
178 | } | |
179 | ||
180 | #endif /* CONFIG_GPIO_SYSFS */ | |
181 | ||
664e3e5a | 182 | #endif /* GPIOLIB_H */ |