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 {
33 /* gpio suffixes used for ACPI and device tree lookup */
34 static const char * const gpio_suffixes[] = { "gpios", "gpio" };
37 void acpi_gpiochip_add(struct gpio_chip *chip);
38 void acpi_gpiochip_remove(struct gpio_chip *chip);
40 void acpi_gpiochip_request_interrupts(struct gpio_chip *chip);
41 void acpi_gpiochip_free_interrupts(struct gpio_chip *chip);
43 struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
44 const char *propname, int index,
45 struct acpi_gpio_info *info);
46 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
47 const char *propname, int index,
48 struct acpi_gpio_info *info);
50 int acpi_gpio_count(struct device *dev, const char *con_id);
52 bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id);
54 static inline void acpi_gpiochip_add(struct gpio_chip *chip) { }
55 static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { }
58 acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { }
61 acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { }
63 static inline struct gpio_desc *
64 acpi_get_gpiod_by_index(struct acpi_device *adev, const char *propname,
65 int index, struct acpi_gpio_info *info)
67 return ERR_PTR(-ENOSYS);
69 static inline struct gpio_desc *
70 acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname,
71 int index, struct acpi_gpio_info *info)
73 return ERR_PTR(-ENXIO);
75 static inline int acpi_gpio_count(struct device *dev, const char *con_id)
80 static inline bool acpi_can_fallback_to_crs(struct acpi_device *adev,
87 struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
88 const char *list_name, int index, enum of_gpio_flags *flags);
90 struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
92 extern struct spinlock gpio_lock;
93 extern struct list_head gpio_chips;
96 struct gpio_chip *chip;
98 /* flag symbols are bit numbers */
99 #define FLAG_REQUESTED 0
100 #define FLAG_IS_OUT 1
101 #define FLAG_EXPORT 2 /* protected by sysfs_lock */
102 #define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */
103 #define FLAG_ACTIVE_LOW 6 /* value has active low */
104 #define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */
105 #define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */
106 #define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */
107 #define FLAG_IS_HOGGED 11 /* GPIO is hogged */
109 /* Connection label */
111 /* Name of the GPIO */
115 int gpiod_request(struct gpio_desc *desc, const char *label);
116 void gpiod_free(struct gpio_desc *desc);
117 int gpiod_hog(struct gpio_desc *desc, const char *name,
118 unsigned long lflags, enum gpiod_flags dflags);
121 * Return the GPIO number of the passed descriptor relative to its chip
123 static int __maybe_unused gpio_chip_hwgpio(const struct gpio_desc *desc)
125 return desc - &desc->chip->desc[0];
128 /* With descriptor prefix */
130 #define gpiod_emerg(desc, fmt, ...) \
131 pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
133 #define gpiod_crit(desc, fmt, ...) \
134 pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
136 #define gpiod_err(desc, fmt, ...) \
137 pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
139 #define gpiod_warn(desc, fmt, ...) \
140 pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
142 #define gpiod_info(desc, fmt, ...) \
143 pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
145 #define gpiod_dbg(desc, fmt, ...) \
146 pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
149 /* With chip prefix */
151 #define chip_emerg(chip, fmt, ...) \
152 pr_emerg("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
153 #define chip_crit(chip, fmt, ...) \
154 pr_crit("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
155 #define chip_err(chip, fmt, ...) \
156 pr_err("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
157 #define chip_warn(chip, fmt, ...) \
158 pr_warn("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
159 #define chip_info(chip, fmt, ...) \
160 pr_info("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
161 #define chip_dbg(chip, fmt, ...) \
162 pr_debug("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
164 #ifdef CONFIG_GPIO_SYSFS
166 int gpiochip_sysfs_register(struct gpio_chip *chip);
167 void gpiochip_sysfs_unregister(struct gpio_chip *chip);
171 static inline int gpiochip_sysfs_register(struct gpio_chip *chip)
176 static inline void gpiochip_sysfs_unregister(struct gpio_chip *chip)
180 #endif /* CONFIG_GPIO_SYSFS */
182 #endif /* GPIOLIB_H */