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 {
30 /* gpio suffixes used for ACPI and device tree lookup */
31 static const char * const gpio_suffixes[] = { "gpios", "gpio" };
34 void acpi_gpiochip_add(struct gpio_chip *chip);
35 void acpi_gpiochip_remove(struct gpio_chip *chip);
37 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip);
38 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip);
40 struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
41 const char *propname, int index,
42 struct acpi_gpio_info *info);
44 int acpi_gpio_count(struct device *dev, const char *con_id);
46 static inline void acpi_gpiochip_add(struct gpio_chip *chip) { }
47 static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { }
50 acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { }
53 acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { }
55 static inline struct gpio_desc *
56 acpi_get_gpiod_by_index(struct acpi_device *adev, const char *propname,
57 int index, struct acpi_gpio_info *info)
59 return ERR_PTR(-ENOSYS);
62 static inline int acpi_gpio_count(struct device *dev, const char *con_id)
68 struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
69 const char *list_name, int index, enum of_gpio_flags *flags);
71 struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
73 extern struct spinlock gpio_lock;
74 extern struct list_head gpio_chips;
77 struct gpio_chip *chip;
79 /* flag symbols are bit numbers */
80 #define FLAG_REQUESTED 0
82 #define FLAG_EXPORT 2 /* protected by sysfs_lock */
83 #define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */
84 #define FLAG_TRIG_FALL 4 /* trigger on falling edge */
85 #define FLAG_TRIG_RISE 5 /* trigger on rising edge */
86 #define FLAG_ACTIVE_LOW 6 /* value has active low */
87 #define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */
88 #define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */
89 #define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */
90 #define FLAG_SYSFS_DIR 10 /* show sysfs direction attribute */
91 #define FLAG_IS_HOGGED 11 /* GPIO is hogged */
93 #define ID_SHIFT 16 /* add new flags before this one */
95 #define GPIO_FLAGS_MASK ((1 << ID_SHIFT) - 1)
96 #define GPIO_TRIGGER_MASK (BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE))
101 int gpiod_request(struct gpio_desc *desc, const char *label);
102 void gpiod_free(struct gpio_desc *desc);
103 int gpiod_hog(struct gpio_desc *desc, const char *name,
104 unsigned long lflags, enum gpiod_flags dflags);
107 * Return the GPIO number of the passed descriptor relative to its chip
109 static int __maybe_unused gpio_chip_hwgpio(const struct gpio_desc *desc)
111 return desc - &desc->chip->desc[0];
114 /* With descriptor prefix */
116 #define gpiod_emerg(desc, fmt, ...) \
117 pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
119 #define gpiod_crit(desc, fmt, ...) \
120 pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
122 #define gpiod_err(desc, fmt, ...) \
123 pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
125 #define gpiod_warn(desc, fmt, ...) \
126 pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
128 #define gpiod_info(desc, fmt, ...) \
129 pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
131 #define gpiod_dbg(desc, fmt, ...) \
132 pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
135 /* With chip prefix */
137 #define chip_emerg(chip, fmt, ...) \
138 pr_emerg("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
139 #define chip_crit(chip, fmt, ...) \
140 pr_crit("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
141 #define chip_err(chip, fmt, ...) \
142 pr_err("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
143 #define chip_warn(chip, fmt, ...) \
144 pr_warn("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
145 #define chip_info(chip, fmt, ...) \
146 pr_info("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
147 #define chip_dbg(chip, fmt, ...) \
148 pr_debug("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
150 #ifdef CONFIG_GPIO_SYSFS
152 int gpiochip_export(struct gpio_chip *chip);
153 void gpiochip_unexport(struct gpio_chip *chip);
157 static inline int gpiochip_export(struct gpio_chip *chip)
162 static inline void gpiochip_unexport(struct gpio_chip *chip)
166 #endif /* CONFIG_GPIO_SYSFS */
168 #endif /* GPIOLIB_H */