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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 | ||
5ccff852 MW |
20 | /** |
21 | * struct acpi_gpio_info - ACPI GPIO specific information | |
22 | * @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo | |
23 | * @active_low: in case of @gpioint, the pin is active low | |
24 | */ | |
25 | struct acpi_gpio_info { | |
26 | bool gpioint; | |
27 | bool active_low; | |
28 | }; | |
29 | ||
7f2e553a RI |
30 | /* gpio suffixes used for ACPI and device tree lookup */ |
31 | static const char * const gpio_suffixes[] = { "gpios", "gpio" }; | |
32 | ||
664e3e5a MW |
33 | #ifdef CONFIG_ACPI |
34 | void acpi_gpiochip_add(struct gpio_chip *chip); | |
35 | void acpi_gpiochip_remove(struct gpio_chip *chip); | |
5ccff852 | 36 | |
afa82fab MW |
37 | void acpi_gpiochip_request_interrupts(struct gpio_chip *chip); |
38 | void acpi_gpiochip_free_interrupts(struct gpio_chip *chip); | |
39 | ||
0d9a693c MW |
40 | struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev, |
41 | const char *propname, int index, | |
5ccff852 | 42 | struct acpi_gpio_info *info); |
664e3e5a MW |
43 | #else |
44 | static inline void acpi_gpiochip_add(struct gpio_chip *chip) { } | |
45 | static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { } | |
5ccff852 | 46 | |
afa82fab MW |
47 | static inline void |
48 | acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { } | |
49 | ||
50 | static inline void | |
51 | acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { } | |
52 | ||
5ccff852 | 53 | static inline struct gpio_desc * |
0d9a693c MW |
54 | acpi_get_gpiod_by_index(struct acpi_device *adev, const char *propname, |
55 | int index, struct acpi_gpio_info *info) | |
5ccff852 MW |
56 | { |
57 | return ERR_PTR(-ENOSYS); | |
58 | } | |
664e3e5a MW |
59 | #endif |
60 | ||
f01d9075 AC |
61 | struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np, |
62 | const char *list_name, int index, enum of_gpio_flags *flags); | |
63 | ||
1bd6b601 AC |
64 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum); |
65 | ||
0eb4c6c2 AC |
66 | extern struct spinlock gpio_lock; |
67 | extern struct list_head gpio_chips; | |
68 | ||
69 | struct gpio_desc { | |
70 | struct gpio_chip *chip; | |
71 | unsigned long flags; | |
72 | /* flag symbols are bit numbers */ | |
73 | #define FLAG_REQUESTED 0 | |
74 | #define FLAG_IS_OUT 1 | |
75 | #define FLAG_EXPORT 2 /* protected by sysfs_lock */ | |
76 | #define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */ | |
77 | #define FLAG_TRIG_FALL 4 /* trigger on falling edge */ | |
78 | #define FLAG_TRIG_RISE 5 /* trigger on rising edge */ | |
79 | #define FLAG_ACTIVE_LOW 6 /* value has active low */ | |
80 | #define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */ | |
81 | #define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */ | |
82 | #define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */ | |
ebbeba12 | 83 | #define FLAG_SYSFS_DIR 10 /* show sysfs direction attribute */ |
f625d460 | 84 | #define FLAG_IS_HOGGED 11 /* GPIO is hogged */ |
0eb4c6c2 AC |
85 | |
86 | #define ID_SHIFT 16 /* add new flags before this one */ | |
87 | ||
88 | #define GPIO_FLAGS_MASK ((1 << ID_SHIFT) - 1) | |
89 | #define GPIO_TRIGGER_MASK (BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE)) | |
90 | ||
91 | const char *label; | |
92 | }; | |
93 | ||
94 | int gpiod_request(struct gpio_desc *desc, const char *label); | |
95 | void gpiod_free(struct gpio_desc *desc); | |
f625d460 BP |
96 | int gpiod_hog(struct gpio_desc *desc, const char *name, |
97 | unsigned long lflags, enum gpiod_flags dflags); | |
0eb4c6c2 AC |
98 | |
99 | /* | |
100 | * Return the GPIO number of the passed descriptor relative to its chip | |
101 | */ | |
102 | static int __maybe_unused gpio_chip_hwgpio(const struct gpio_desc *desc) | |
103 | { | |
104 | return desc - &desc->chip->desc[0]; | |
105 | } | |
106 | ||
107 | /* With descriptor prefix */ | |
108 | ||
109 | #define gpiod_emerg(desc, fmt, ...) \ | |
110 | pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\ | |
111 | ##__VA_ARGS__) | |
112 | #define gpiod_crit(desc, fmt, ...) \ | |
113 | pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ | |
114 | ##__VA_ARGS__) | |
115 | #define gpiod_err(desc, fmt, ...) \ | |
116 | pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ | |
117 | ##__VA_ARGS__) | |
118 | #define gpiod_warn(desc, fmt, ...) \ | |
119 | pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ | |
120 | ##__VA_ARGS__) | |
121 | #define gpiod_info(desc, fmt, ...) \ | |
122 | pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \ | |
123 | ##__VA_ARGS__) | |
124 | #define gpiod_dbg(desc, fmt, ...) \ | |
125 | pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\ | |
126 | ##__VA_ARGS__) | |
127 | ||
128 | /* With chip prefix */ | |
129 | ||
130 | #define chip_emerg(chip, fmt, ...) \ | |
131 | pr_emerg("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) | |
132 | #define chip_crit(chip, fmt, ...) \ | |
133 | pr_crit("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) | |
134 | #define chip_err(chip, fmt, ...) \ | |
135 | pr_err("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) | |
136 | #define chip_warn(chip, fmt, ...) \ | |
137 | pr_warn("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) | |
138 | #define chip_info(chip, fmt, ...) \ | |
139 | pr_info("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) | |
140 | #define chip_dbg(chip, fmt, ...) \ | |
141 | pr_debug("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__) | |
142 | ||
143 | #ifdef CONFIG_GPIO_SYSFS | |
144 | ||
145 | int gpiochip_export(struct gpio_chip *chip); | |
146 | void gpiochip_unexport(struct gpio_chip *chip); | |
147 | ||
148 | #else | |
149 | ||
150 | static inline int gpiochip_export(struct gpio_chip *chip) | |
151 | { | |
152 | return 0; | |
153 | } | |
154 | ||
155 | static inline void gpiochip_unexport(struct gpio_chip *chip) | |
156 | { | |
157 | } | |
158 | ||
159 | #endif /* CONFIG_GPIO_SYSFS */ | |
160 | ||
664e3e5a | 161 | #endif /* GPIOLIB_H */ |