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 device
*dev
, int index
,
38 struct acpi_gpio_info
*info
);
40 static inline void acpi_gpiochip_add(struct gpio_chip
*chip
) { }
41 static inline void acpi_gpiochip_remove(struct gpio_chip
*chip
) { }
44 acpi_gpiochip_request_interrupts(struct gpio_chip
*chip
) { }
47 acpi_gpiochip_free_interrupts(struct gpio_chip
*chip
) { }
49 static inline struct gpio_desc
*
50 acpi_get_gpiod_by_index(struct device
*dev
, int index
,
51 struct acpi_gpio_info
*info
)
53 return ERR_PTR(-ENOSYS
);
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
);
60 struct gpio_desc
*gpiochip_get_desc(struct gpio_chip
*chip
, u16 hwnum
);
62 extern struct spinlock gpio_lock
;
63 extern struct list_head gpio_chips
;
66 struct gpio_chip
*chip
;
68 /* flag symbols are bit numbers */
69 #define FLAG_REQUESTED 0
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 */
80 #define ID_SHIFT 16 /* add new flags before this one */
82 #define GPIO_FLAGS_MASK ((1 << ID_SHIFT) - 1)
83 #define GPIO_TRIGGER_MASK (BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE))
88 int gpiod_request(struct gpio_desc
*desc
, const char *label
);
89 void gpiod_free(struct gpio_desc
*desc
);
92 * Return the GPIO number of the passed descriptor relative to its chip
94 static int __maybe_unused
gpio_chip_hwgpio(const struct gpio_desc
*desc
)
96 return desc
- &desc
->chip
->desc
[0];
99 /* With descriptor prefix */
101 #define gpiod_emerg(desc, fmt, ...) \
102 pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
104 #define gpiod_crit(desc, fmt, ...) \
105 pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
107 #define gpiod_err(desc, fmt, ...) \
108 pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
110 #define gpiod_warn(desc, fmt, ...) \
111 pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
113 #define gpiod_info(desc, fmt, ...) \
114 pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
116 #define gpiod_dbg(desc, fmt, ...) \
117 pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
120 /* With chip prefix */
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__)
135 #ifdef CONFIG_GPIO_SYSFS
137 int gpiochip_export(struct gpio_chip
*chip
);
138 void gpiochip_unexport(struct gpio_chip
*chip
);
142 static inline int gpiochip_export(struct gpio_chip
*chip
)
147 static inline void gpiochip_unexport(struct gpio_chip
*chip
)
151 #endif /* CONFIG_GPIO_SYSFS */
153 #endif /* GPIOLIB_H */
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