c0017ed719
The latest gpio hogging mechanism assigns each gpio a 'line-name' in the devicetree. The 'name' field is different from the 'label' field. 'label' is only used for requested GPIOs to describe its current use by driver or userspace. The 'name' field describes the GPIO itself, not the use. This is most likely identical to the label in the schematic on the GPIO line and should help to find this particular GPIO. This is equivalent to the gpiochip->names array. However names should be stored in the GPIO descriptor. We will use gpiochip->names in the future only as initializer for the GPIO descriptors for drivers that assign GPIO names hardcoded. All other GPIO names will be parsed from DT and directly assigned to the GPIO descriptor. This patch adds a helper function to find gpio descriptors by name instead of gpio number. Signed-off-by: Markus Pargmann <mpa@pengutronix.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
165 lines
4.9 KiB
C
165 lines
4.9 KiB
C
/*
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* Internal GPIO functions.
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*
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* Copyright (C) 2013, Intel Corporation
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* Author: Mika Westerberg <mika.westerberg@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef GPIOLIB_H
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#define GPIOLIB_H
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#include <linux/err.h>
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#include <linux/device.h>
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enum of_gpio_flags;
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struct acpi_device;
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/**
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* struct acpi_gpio_info - ACPI GPIO specific information
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* @gpioint: if %true this GPIO is of type GpioInt otherwise type is GpioIo
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* @active_low: in case of @gpioint, the pin is active low
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*/
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struct acpi_gpio_info {
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bool gpioint;
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bool active_low;
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};
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/* gpio suffixes used for ACPI and device tree lookup */
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static const char * const gpio_suffixes[] = { "gpios", "gpio" };
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#ifdef CONFIG_ACPI
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void acpi_gpiochip_add(struct gpio_chip *chip);
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void acpi_gpiochip_remove(struct gpio_chip *chip);
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void acpi_gpiochip_request_interrupts(struct gpio_chip *chip);
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void acpi_gpiochip_free_interrupts(struct gpio_chip *chip);
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struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
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const char *propname, int index,
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struct acpi_gpio_info *info);
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int acpi_gpio_count(struct device *dev, const char *con_id);
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#else
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static inline void acpi_gpiochip_add(struct gpio_chip *chip) { }
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static inline void acpi_gpiochip_remove(struct gpio_chip *chip) { }
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static inline void
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acpi_gpiochip_request_interrupts(struct gpio_chip *chip) { }
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static inline void
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acpi_gpiochip_free_interrupts(struct gpio_chip *chip) { }
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static inline struct gpio_desc *
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acpi_get_gpiod_by_index(struct acpi_device *adev, const char *propname,
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int index, struct acpi_gpio_info *info)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline int acpi_gpio_count(struct device *dev, const char *con_id)
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{
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return -ENODEV;
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}
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#endif
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struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
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const char *list_name, int index, enum of_gpio_flags *flags);
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struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
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extern struct spinlock gpio_lock;
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extern struct list_head gpio_chips;
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struct gpio_desc {
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struct gpio_chip *chip;
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unsigned long flags;
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/* flag symbols are bit numbers */
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#define FLAG_REQUESTED 0
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#define FLAG_IS_OUT 1
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#define FLAG_EXPORT 2 /* protected by sysfs_lock */
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#define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */
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#define FLAG_ACTIVE_LOW 6 /* value has active low */
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#define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */
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#define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */
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#define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */
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#define FLAG_IS_HOGGED 11 /* GPIO is hogged */
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/* Connection label */
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const char *label;
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/* Name of the GPIO */
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const char *name;
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};
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int gpiod_request(struct gpio_desc *desc, const char *label);
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void gpiod_free(struct gpio_desc *desc);
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int gpiod_hog(struct gpio_desc *desc, const char *name,
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unsigned long lflags, enum gpiod_flags dflags);
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/*
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* Return the GPIO number of the passed descriptor relative to its chip
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*/
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static int __maybe_unused gpio_chip_hwgpio(const struct gpio_desc *desc)
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{
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return desc - &desc->chip->desc[0];
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}
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/* With descriptor prefix */
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#define gpiod_emerg(desc, fmt, ...) \
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pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
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##__VA_ARGS__)
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#define gpiod_crit(desc, fmt, ...) \
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pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
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##__VA_ARGS__)
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#define gpiod_err(desc, fmt, ...) \
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pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
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##__VA_ARGS__)
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#define gpiod_warn(desc, fmt, ...) \
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pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
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##__VA_ARGS__)
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#define gpiod_info(desc, fmt, ...) \
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pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
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##__VA_ARGS__)
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#define gpiod_dbg(desc, fmt, ...) \
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pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
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##__VA_ARGS__)
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/* With chip prefix */
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#define chip_emerg(chip, fmt, ...) \
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pr_emerg("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
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#define chip_crit(chip, fmt, ...) \
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pr_crit("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
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#define chip_err(chip, fmt, ...) \
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pr_err("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
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#define chip_warn(chip, fmt, ...) \
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pr_warn("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
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#define chip_info(chip, fmt, ...) \
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pr_info("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
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#define chip_dbg(chip, fmt, ...) \
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pr_debug("GPIO chip %s: " fmt, chip->label, ##__VA_ARGS__)
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#ifdef CONFIG_GPIO_SYSFS
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int gpiochip_sysfs_register(struct gpio_chip *chip);
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void gpiochip_sysfs_unregister(struct gpio_chip *chip);
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#else
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static inline int gpiochip_sysfs_register(struct gpio_chip *chip)
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{
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return 0;
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}
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static inline void gpiochip_sysfs_unregister(struct gpio_chip *chip)
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{
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}
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#endif /* CONFIG_GPIO_SYSFS */
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#endif /* GPIOLIB_H */
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