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95a4eed7dd
Currently it's possible that character device interface may return the error codes which are not supposed to be seen by user space. In this case it's EPROBE_DEFER. Wrap it to return -ENODEV instead as sysfs does. Fixes:d7c51b47ac("gpio: userspace ABI for reading/writing GPIO lines") Fixes:61f922db72("gpio: userspace ABI for reading GPIO line events") Fixes:3c0d9c635a("gpiolib: cdev: support GPIO_V2_GET_LINE_IOCTL and GPIO_V2_LINE_GET_VALUES_IOCTL") Reported-by: Suresh Balakrishnan <suresh.balakrishnan@intel.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
201 lines
6.7 KiB
C
201 lines
6.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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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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#ifndef GPIOLIB_H
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#define GPIOLIB_H
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#include <linux/gpio/driver.h>
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#include <linux/gpio/consumer.h> /* for enum gpiod_flags */
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/cdev.h>
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#define GPIOCHIP_NAME "gpiochip"
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/**
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* struct gpio_device - internal state container for GPIO devices
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* @id: numerical ID number for the GPIO chip
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* @dev: the GPIO device struct
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* @chrdev: character device for the GPIO device
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* @mockdev: class device used by the deprecated sysfs interface (may be
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* NULL)
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* @owner: helps prevent removal of modules exporting active GPIOs
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* @chip: pointer to the corresponding gpiochip, holding static
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* data for this device
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* @descs: array of ngpio descriptors.
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* @ngpio: the number of GPIO lines on this GPIO device, equal to the size
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* of the @descs array.
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* @base: GPIO base in the DEPRECATED global Linux GPIO numberspace, assigned
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* at device creation time.
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* @label: a descriptive name for the GPIO device, such as the part number
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* or name of the IP component in a System on Chip.
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* @data: per-instance data assigned by the driver
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* @list: links gpio_device:s together for traversal
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*
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* This state container holds most of the runtime variable data
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* for a GPIO device and can hold references and live on after the
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* GPIO chip has been removed, if it is still being used from
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* userspace.
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*/
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struct gpio_device {
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int id;
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struct device dev;
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struct cdev chrdev;
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struct device *mockdev;
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struct module *owner;
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struct gpio_chip *chip;
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struct gpio_desc *descs;
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int base;
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u16 ngpio;
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const char *label;
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void *data;
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struct list_head list;
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struct blocking_notifier_head notifier;
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#ifdef CONFIG_PINCTRL
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/*
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* If CONFIG_PINCTRL is enabled, then gpio controllers can optionally
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* describe the actual pin range which they serve in an SoC. This
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* information would be used by pinctrl subsystem to configure
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* corresponding pins for gpio usage.
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*/
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struct list_head pin_ranges;
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#endif
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};
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/* gpio suffixes used for ACPI and device tree lookup */
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static __maybe_unused const char * const gpio_suffixes[] = { "gpios", "gpio" };
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struct gpio_array {
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struct gpio_desc **desc;
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unsigned int size;
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struct gpio_chip *chip;
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unsigned long *get_mask;
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unsigned long *set_mask;
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unsigned long invert_mask[];
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};
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struct gpio_desc *gpiochip_get_desc(struct gpio_chip *gc, unsigned int hwnum);
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int gpiod_get_array_value_complex(bool raw, bool can_sleep,
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unsigned int array_size,
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struct gpio_desc **desc_array,
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struct gpio_array *array_info,
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unsigned long *value_bitmap);
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int gpiod_set_array_value_complex(bool raw, bool can_sleep,
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unsigned int array_size,
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struct gpio_desc **desc_array,
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struct gpio_array *array_info,
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unsigned long *value_bitmap);
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extern spinlock_t gpio_lock;
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extern struct list_head gpio_devices;
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struct gpio_desc {
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struct gpio_device *gdev;
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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_IRQ_IS_ENABLED 10 /* GPIO is connected to an enabled IRQ */
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#define FLAG_IS_HOGGED 11 /* GPIO is hogged */
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#define FLAG_TRANSITORY 12 /* GPIO may lose value in sleep or reset */
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#define FLAG_PULL_UP 13 /* GPIO has pull up enabled */
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#define FLAG_PULL_DOWN 14 /* GPIO has pull down enabled */
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#define FLAG_BIAS_DISABLE 15 /* GPIO has pull disabled */
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#define FLAG_EDGE_RISING 16 /* GPIO CDEV detects rising edge events */
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#define FLAG_EDGE_FALLING 17 /* GPIO CDEV detects falling edge events */
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#define FLAG_EVENT_CLOCK_REALTIME 18 /* GPIO CDEV reports REALTIME timestamps in events */
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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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#ifdef CONFIG_OF_DYNAMIC
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struct device_node *hog;
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#endif
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#ifdef CONFIG_GPIO_CDEV
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/* debounce period in microseconds */
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unsigned int debounce_period_us;
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#endif
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};
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#define gpiod_not_found(desc) (IS_ERR(desc) && PTR_ERR(desc) == -ENOENT)
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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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static inline int gpiod_request_user(struct gpio_desc *desc, const char *label)
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{
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int ret;
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ret = gpiod_request(desc, label);
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if (ret == -EPROBE_DEFER)
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ret = -ENODEV;
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return ret;
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}
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int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id,
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unsigned long lflags, enum gpiod_flags dflags);
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int gpio_set_debounce_timeout(struct gpio_desc *desc, unsigned int debounce);
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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 inline int gpio_chip_hwgpio(const struct gpio_desc *desc)
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{
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return desc - &desc->gdev->descs[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(gc, fmt, ...) \
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dev_emerg(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
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#define chip_crit(gc, fmt, ...) \
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dev_crit(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
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#define chip_err(gc, fmt, ...) \
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dev_err(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
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#define chip_warn(gc, fmt, ...) \
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dev_warn(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
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#define chip_info(gc, fmt, ...) \
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dev_info(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
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#define chip_dbg(gc, fmt, ...) \
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dev_dbg(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
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#endif /* GPIOLIB_H */
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