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);
45 struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
46 const char *propname, int index,
47 struct acpi_gpio_info *info);
49 int acpi_gpio_count(struct device *dev, const char *con_id);
51 bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id);
53 static inline void acpi_gpiochip_add(struct gpio_chip *chip) { }
54 static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { }
57 acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { }
60 acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { }
62 static inline struct gpio_desc *
63 acpi_get_gpiod_by_index(struct acpi_device *adev, const char *propname,
64 int index, struct acpi_gpio_info *info)
66 return ERR_PTR(-ENOSYS);
68 static inline struct gpio_desc *
69 acpi_node_get_gpiod(struct fwnode_handle *fwnode, const char *propname,
70 int index, struct acpi_gpio_info *info)
72 return ERR_PTR(-ENXIO);
74 static inline int acpi_gpio_count(struct device *dev, const char *con_id)
79 static inline bool acpi_can_fallback_to_crs(struct acpi_device *adev,
86 struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
87 const char *list_name, int index, enum of_gpio_flags *flags);
89 struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
91 extern struct spinlock gpio_lock;
92 extern struct list_head gpio_chips;
95 struct gpio_chip *chip;
97 /* flag symbols are bit numbers */
98 #define FLAG_REQUESTED 0
100 #define FLAG_EXPORT 2 /* protected by sysfs_lock */
101 #define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */
102 #define FLAG_ACTIVE_LOW 6 /* value has active low */
103 #define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */
104 #define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */
105 #define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */
106 #define FLAG_IS_HOGGED 11 /* GPIO is hogged */
108 /* Connection label */
110 /* Name of the GPIO */
114 int gpiod_request(struct gpio_desc *desc, const char *label);
115 void gpiod_free(struct gpio_desc *desc);
116 int gpiod_hog(struct gpio_desc *desc, const char *name,
117 unsigned long lflags, enum gpiod_flags dflags);
120 * Return the GPIO number of the passed descriptor relative to its chip
122 static int __maybe_unused gpio_chip_hwgpio(const struct gpio_desc *desc)
124 return desc - &desc->chip->desc[0];
127 /* With descriptor prefix */
129 #define gpiod_emerg(desc, fmt, ...) \
130 pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
132 #define gpiod_crit(desc, fmt, ...) \
133 pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
135 #define gpiod_err(desc, fmt, ...) \
136 pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
138 #define gpiod_warn(desc, fmt, ...) \
139 pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
141 #define gpiod_info(desc, fmt, ...) \
142 pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
144 #define gpiod_dbg(desc, fmt, ...) \
145 pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
148 /* With chip prefix */
150 #define chip_emerg(chip, fmt, ...) \
151 pr_emerg("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
152 #define chip_crit(chip, fmt, ...) \
153 pr_crit("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
154 #define chip_err(chip, fmt, ...) \
155 pr_err("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
156 #define chip_warn(chip, fmt, ...) \
157 pr_warn("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
158 #define chip_info(chip, fmt, ...) \
159 pr_info("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
160 #define chip_dbg(chip, fmt, ...) \
161 pr_debug("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
163 #ifdef CONFIG_GPIO_SYSFS
165 int gpiochip_sysfs_register(struct gpio_chip *chip);
166 void gpiochip_sysfs_unregister(struct gpio_chip *chip);
170 static inline int gpiochip_sysfs_register(struct gpio_chip *chip)
175 static inline void gpiochip_sysfs_unregister(struct gpio_chip *chip)
179 #endif /* CONFIG_GPIO_SYSFS */
181 #endif /* GPIOLIB_H */