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>
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
27 struct acpi_gpio_info
{
32 /* gpio suffixes used for ACPI and device tree lookup */
33 static const char * const gpio_suffixes
[] = { "gpios", "gpio" };
36 void acpi_gpiochip_add(struct gpio_chip
*chip
);
37 void acpi_gpiochip_remove(struct gpio_chip
*chip
);
39 void acpi_gpiochip_request_interrupts(struct gpio_chip
*chip
);
40 void acpi_gpiochip_free_interrupts(struct gpio_chip
*chip
);
42 struct gpio_desc
*acpi_get_gpiod_by_index(struct acpi_device
*adev
,
43 const char *propname
, int index
,
44 struct acpi_gpio_info
*info
);
46 int acpi_gpio_count(struct device
*dev
, const char *con_id
);
48 static inline void acpi_gpiochip_add(struct gpio_chip
*chip
) { }
49 static inline void acpi_gpiochip_remove(struct gpio_chip
*chip
) { }
52 acpi_gpiochip_request_interrupts(struct gpio_chip
*chip
) { }
55 acpi_gpiochip_free_interrupts(struct gpio_chip
*chip
) { }
57 static inline struct gpio_desc
*
58 acpi_get_gpiod_by_index(struct acpi_device
*adev
, const char *propname
,
59 int index
, struct acpi_gpio_info
*info
)
61 return ERR_PTR(-ENOSYS
);
64 static inline int acpi_gpio_count(struct device
*dev
, const char *con_id
)
70 struct gpio_desc
*of_get_named_gpiod_flags(struct device_node
*np
,
71 const char *list_name
, int index
, enum of_gpio_flags
*flags
);
73 struct gpio_desc
*gpiochip_get_desc(struct gpio_chip
*chip
, u16 hwnum
);
75 extern struct spinlock gpio_lock
;
76 extern struct list_head gpio_chips
;
79 struct gpio_chip
*chip
;
81 /* flag symbols are bit numbers */
82 #define FLAG_REQUESTED 0
84 #define FLAG_EXPORT 2 /* protected by sysfs_lock */
85 #define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */
86 #define FLAG_TRIG_FALL 4 /* trigger on falling edge */
87 #define FLAG_TRIG_RISE 5 /* trigger on rising edge */
88 #define FLAG_ACTIVE_LOW 6 /* value has active low */
89 #define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */
90 #define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */
91 #define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */
92 #define FLAG_SYSFS_DIR 10 /* show sysfs direction attribute */
93 #define FLAG_IS_HOGGED 11 /* GPIO is hogged */
95 #define GPIO_TRIGGER_MASK (BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE))
100 int gpiod_request(struct gpio_desc
*desc
, const char *label
);
101 void gpiod_free(struct gpio_desc
*desc
);
102 int gpiod_hog(struct gpio_desc
*desc
, const char *name
,
103 unsigned long lflags
, enum gpiod_flags dflags
);
106 * Return the GPIO number of the passed descriptor relative to its chip
108 static int __maybe_unused
gpio_chip_hwgpio(const struct gpio_desc
*desc
)
110 return desc
- &desc
->chip
->desc
[0];
113 /* With descriptor prefix */
115 #define gpiod_emerg(desc, fmt, ...) \
116 pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
118 #define gpiod_crit(desc, fmt, ...) \
119 pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
121 #define gpiod_err(desc, fmt, ...) \
122 pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
124 #define gpiod_warn(desc, fmt, ...) \
125 pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
127 #define gpiod_info(desc, fmt, ...) \
128 pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
130 #define gpiod_dbg(desc, fmt, ...) \
131 pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
134 /* With chip prefix */
136 #define chip_emerg(chip, fmt, ...) \
137 pr_emerg("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
138 #define chip_crit(chip, fmt, ...) \
139 pr_crit("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
140 #define chip_err(chip, fmt, ...) \
141 pr_err("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
142 #define chip_warn(chip, fmt, ...) \
143 pr_warn("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
144 #define chip_info(chip, fmt, ...) \
145 pr_info("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
146 #define chip_dbg(chip, fmt, ...) \
147 pr_debug("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
149 #ifdef CONFIG_GPIO_SYSFS
151 int gpiochip_sysfs_register(struct gpio_chip
*chip
);
152 void gpiochip_sysfs_unregister(struct gpio_chip
*chip
);
156 static inline int gpiochip_sysfs_register(struct gpio_chip
*chip
)
161 static inline void gpiochip_sysfs_unregister(struct gpio_chip
*chip
)
165 #endif /* CONFIG_GPIO_SYSFS */
167 #endif /* GPIOLIB_H */
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