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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/gpio/gpiolib.h
2 * Internal GPIO functions.
4 * Copyright (C) 2013, Intel Corporation
5 * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
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.
15 #include <linux/err.h>
16 #include <linux/device.h>
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
25 struct acpi_gpio_info
{
31 void acpi_gpiochip_add(struct gpio_chip
*chip
);
32 void acpi_gpiochip_remove(struct gpio_chip
*chip
);
34 void acpi_gpiochip_request_interrupts(struct gpio_chip
*chip
);
35 void acpi_gpiochip_free_interrupts(struct gpio_chip
*chip
);
37 struct gpio_desc
*acpi_get_gpiod_by_index(struct acpi_device
*adev
,
38 const char *propname
, int index
,
39 struct acpi_gpio_info
*info
);
41 static inline void acpi_gpiochip_add(struct gpio_chip
*chip
) { }
42 static inline void acpi_gpiochip_remove(struct gpio_chip
*chip
) { }
45 acpi_gpiochip_request_interrupts(struct gpio_chip
*chip
) { }
48 acpi_gpiochip_free_interrupts(struct gpio_chip
*chip
) { }
50 static inline struct gpio_desc
*
51 acpi_get_gpiod_by_index(struct acpi_device
*adev
, const char *propname
,
52 int index
, struct acpi_gpio_info
*info
)
54 return ERR_PTR(-ENOSYS
);
58 struct gpio_desc
*of_get_named_gpiod_flags(struct device_node
*np
,
59 const char *list_name
, int index
, enum of_gpio_flags
*flags
);
61 struct gpio_desc
*gpiochip_get_desc(struct gpio_chip
*chip
, u16 hwnum
);
63 extern struct spinlock gpio_lock
;
64 extern struct list_head gpio_chips
;
67 struct gpio_chip
*chip
;
69 /* flag symbols are bit numbers */
70 #define FLAG_REQUESTED 0
72 #define FLAG_EXPORT 2 /* protected by sysfs_lock */
73 #define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */
74 #define FLAG_TRIG_FALL 4 /* trigger on falling edge */
75 #define FLAG_TRIG_RISE 5 /* trigger on rising edge */
76 #define FLAG_ACTIVE_LOW 6 /* value has active low */
77 #define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */
78 #define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */
79 #define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */
81 #define ID_SHIFT 16 /* add new flags before this one */
83 #define GPIO_FLAGS_MASK ((1 << ID_SHIFT) - 1)
84 #define GPIO_TRIGGER_MASK (BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE))
89 int gpiod_request(struct gpio_desc
*desc
, const char *label
);
90 void gpiod_free(struct gpio_desc
*desc
);
93 * Return the GPIO number of the passed descriptor relative to its chip
95 static int __maybe_unused
gpio_chip_hwgpio(const struct gpio_desc
*desc
)
97 return desc
- &desc
->chip
->desc
[0];
100 /* With descriptor prefix */
102 #define gpiod_emerg(desc, fmt, ...) \
103 pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
105 #define gpiod_crit(desc, fmt, ...) \
106 pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
108 #define gpiod_err(desc, fmt, ...) \
109 pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
111 #define gpiod_warn(desc, fmt, ...) \
112 pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
114 #define gpiod_info(desc, fmt, ...) \
115 pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
117 #define gpiod_dbg(desc, fmt, ...) \
118 pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
121 /* With chip prefix */
123 #define chip_emerg(chip, fmt, ...) \
124 pr_emerg("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
125 #define chip_crit(chip, fmt, ...) \
126 pr_crit("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
127 #define chip_err(chip, fmt, ...) \
128 pr_err("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
129 #define chip_warn(chip, fmt, ...) \
130 pr_warn("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
131 #define chip_info(chip, fmt, ...) \
132 pr_info("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
133 #define chip_dbg(chip, fmt, ...) \
134 pr_debug("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
136 #ifdef CONFIG_GPIO_SYSFS
138 int gpiochip_export(struct gpio_chip
*chip
);
139 void gpiochip_unexport(struct gpio_chip
*chip
);
143 static inline int gpiochip_export(struct gpio_chip
*chip
)
148 static inline void gpiochip_unexport(struct gpio_chip
*chip
)
152 #endif /* CONFIG_GPIO_SYSFS */
154 #endif /* GPIOLIB_H */