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