Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 261 insertions, 0 deletions

diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
new file mode 100644
index 0000000000..aa19260836
--- /dev/null
+++ b/drivers/gpio/gpiolib.h
@@ -0,0 +1,261 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Internal GPIO functions.
+ *
+ * Copyright (C) 2013, Intel Corporation
+ * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
+ */
+
+#ifndef GPIOLIB_H
+#define GPIOLIB_H
+
+#include <linux/cdev.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h> /* for enum gpiod_flags */
+#include <linux/gpio/driver.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/rwsem.h>
+
+#define GPIOCHIP_NAME	"gpiochip"
+
+/**
+ * struct gpio_device - internal state container for GPIO devices
+ * @dev: the GPIO device struct
+ * @chrdev: character device for the GPIO device
+ * @id: numerical ID number for the GPIO chip
+ * @mockdev: class device used by the deprecated sysfs interface (may be
+ * NULL)
+ * @owner: helps prevent removal of modules exporting active GPIOs
+ * @chip: pointer to the corresponding gpiochip, holding static
+ * data for this device
+ * @descs: array of ngpio descriptors.
+ * @ngpio: the number of GPIO lines on this GPIO device, equal to the size
+ * of the @descs array.
+ * @base: GPIO base in the DEPRECATED global Linux GPIO numberspace, assigned
+ * at device creation time.
+ * @label: a descriptive name for the GPIO device, such as the part number
+ * or name of the IP component in a System on Chip.
+ * @data: per-instance data assigned by the driver
+ * @list: links gpio_device:s together for traversal
+ * @line_state_notifier: used to notify subscribers about lines being
+ *                       requested, released or reconfigured
+ * @device_notifier: used to notify character device wait queues about the GPIO
+ *                   device being unregistered
+ * @sem: protects the structure from a NULL-pointer dereference of @chip by
+ *       user-space operations when the device gets unregistered during
+ *       a hot-unplug event
+ * @pin_ranges: range of pins served by the GPIO driver
+ *
+ * This state container holds most of the runtime variable data
+ * for a GPIO device and can hold references and live on after the
+ * GPIO chip has been removed, if it is still being used from
+ * userspace.
+ */
+struct gpio_device {
+	struct device		dev;
+	struct cdev		chrdev;
+	int			id;
+	struct device		*mockdev;
+	struct module		*owner;
+	struct gpio_chip	*chip;
+	struct gpio_desc	*descs;
+	int			base;
+	u16			ngpio;
+	const char		*label;
+	void			*data;
+	struct list_head        list;
+	struct blocking_notifier_head line_state_notifier;
+	struct blocking_notifier_head device_notifier;
+	struct rw_semaphore	sem;
+
+#ifdef CONFIG_PINCTRL
+	/*
+	 * If CONFIG_PINCTRL is enabled, then gpio controllers can optionally
+	 * describe the actual pin range which they serve in an SoC. This
+	 * information would be used by pinctrl subsystem to configure
+	 * corresponding pins for gpio usage.
+	 */
+	struct list_head pin_ranges;
+#endif
+};
+
+static inline struct gpio_device *to_gpio_device(struct device *dev)
+{
+	return container_of(dev, struct gpio_device, dev);
+}
+
+/* gpio suffixes used for ACPI and device tree lookup */
+static __maybe_unused const char * const gpio_suffixes[] = { "gpios", "gpio" };
+
+/**
+ * struct gpio_array - Opaque descriptor for a structure of GPIO array attributes
+ *
+ * @desc:		Array of pointers to the GPIO descriptors
+ * @size:		Number of elements in desc
+ * @chip:		Parent GPIO chip
+ * @get_mask:		Get mask used in fastpath
+ * @set_mask:		Set mask used in fastpath
+ * @invert_mask:	Invert mask used in fastpath
+ *
+ * This structure is attached to struct gpiod_descs obtained from
+ * gpiod_get_array() and can be passed back to get/set array functions in order
+ * to activate fast processing path if applicable.
+ */
+struct gpio_array {
+	struct gpio_desc	**desc;
+	unsigned int		size;
+	struct gpio_chip	*chip;
+	unsigned long		*get_mask;
+	unsigned long		*set_mask;
+	unsigned long		invert_mask[];
+};
+
+struct gpio_desc *gpiochip_get_desc(struct gpio_chip *gc, unsigned int hwnum);
+
+#define for_each_gpio_desc(gc, desc)					\
+	for (unsigned int __i = 0;					\
+	     __i < gc->ngpio && (desc = gpiochip_get_desc(gc, __i));	\
+	     __i++)							\
+
+#define for_each_gpio_desc_with_flag(gc, desc, flag)			\
+	for_each_gpio_desc(gc, desc)					\
+		if (!test_bit(flag, &desc->flags)) {} else
+
+int gpiod_get_array_value_complex(bool raw, bool can_sleep,
+				  unsigned int array_size,
+				  struct gpio_desc **desc_array,
+				  struct gpio_array *array_info,
+				  unsigned long *value_bitmap);
+int gpiod_set_array_value_complex(bool raw, bool can_sleep,
+				  unsigned int array_size,
+				  struct gpio_desc **desc_array,
+				  struct gpio_array *array_info,
+				  unsigned long *value_bitmap);
+
+extern spinlock_t gpio_lock;
+extern struct list_head gpio_devices;
+
+void gpiod_line_state_notify(struct gpio_desc *desc, unsigned long action);
+
+/**
+ * struct gpio_desc - Opaque descriptor for a GPIO
+ *
+ * @gdev:		Pointer to the parent GPIO device
+ * @flags:		Binary descriptor flags
+ * @label:		Name of the consumer
+ * @name:		Line name
+ * @hog:		Pointer to the device node that hogs this line (if any)
+ * @debounce_period_us:	Debounce period in microseconds
+ *
+ * These are obtained using gpiod_get() and are preferable to the old
+ * integer-based handles.
+ *
+ * Contrary to integers, a pointer to a &struct gpio_desc is guaranteed to be
+ * valid until the GPIO is released.
+ */
+struct gpio_desc {
+	struct gpio_device	*gdev;
+	unsigned long		flags;
+/* flag symbols are bit numbers */
+#define FLAG_REQUESTED	0
+#define FLAG_IS_OUT	1
+#define FLAG_EXPORT	2	/* protected by sysfs_lock */
+#define FLAG_SYSFS	3	/* exported via /sys/class/gpio/control */
+#define FLAG_ACTIVE_LOW	6	/* value has active low */
+#define FLAG_OPEN_DRAIN	7	/* Gpio is open drain type */
+#define FLAG_OPEN_SOURCE 8	/* Gpio is open source type */
+#define FLAG_USED_AS_IRQ 9	/* GPIO is connected to an IRQ */
+#define FLAG_IRQ_IS_ENABLED 10	/* GPIO is connected to an enabled IRQ */
+#define FLAG_IS_HOGGED	11	/* GPIO is hogged */
+#define FLAG_TRANSITORY 12	/* GPIO may lose value in sleep or reset */
+#define FLAG_PULL_UP    13	/* GPIO has pull up enabled */
+#define FLAG_PULL_DOWN  14	/* GPIO has pull down enabled */
+#define FLAG_BIAS_DISABLE    15	/* GPIO has pull disabled */
+#define FLAG_EDGE_RISING     16	/* GPIO CDEV detects rising edge events */
+#define FLAG_EDGE_FALLING    17	/* GPIO CDEV detects falling edge events */
+#define FLAG_EVENT_CLOCK_REALTIME	18 /* GPIO CDEV reports REALTIME timestamps in events */
+#define FLAG_EVENT_CLOCK_HTE		19 /* GPIO CDEV reports hardware timestamps in events */
+
+	/* Connection label */
+	const char		*label;
+	/* Name of the GPIO */
+	const char		*name;
+#ifdef CONFIG_OF_DYNAMIC
+	struct device_node	*hog;
+#endif
+#ifdef CONFIG_GPIO_CDEV
+	/* debounce period in microseconds */
+	unsigned int		debounce_period_us;
+#endif
+};
+
+#define gpiod_not_found(desc)		(IS_ERR(desc) && PTR_ERR(desc) == -ENOENT)
+
+int gpiod_request(struct gpio_desc *desc, const char *label);
+void gpiod_free(struct gpio_desc *desc);
+
+static inline int gpiod_request_user(struct gpio_desc *desc, const char *label)
+{
+	int ret;
+
+	ret = gpiod_request(desc, label);
+	if (ret == -EPROBE_DEFER)
+		ret = -ENODEV;
+
+	return ret;
+}
+
+int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id,
+		unsigned long lflags, enum gpiod_flags dflags);
+int gpio_set_debounce_timeout(struct gpio_desc *desc, unsigned int debounce);
+int gpiod_hog(struct gpio_desc *desc, const char *name,
+		unsigned long lflags, enum gpiod_flags dflags);
+int gpiochip_get_ngpios(struct gpio_chip *gc, struct device *dev);
+
+/*
+ * Return the GPIO number of the passed descriptor relative to its chip
+ */
+static inline int gpio_chip_hwgpio(const struct gpio_desc *desc)
+{
+	return desc - &desc->gdev->descs[0];
+}
+
+/* With descriptor prefix */
+
+#define gpiod_emerg(desc, fmt, ...)					       \
+	pr_emerg("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
+		 ##__VA_ARGS__)
+#define gpiod_crit(desc, fmt, ...)					       \
+	pr_crit("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
+		 ##__VA_ARGS__)
+#define gpiod_err(desc, fmt, ...)					       \
+	pr_err("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",  \
+		 ##__VA_ARGS__)
+#define gpiod_warn(desc, fmt, ...)					       \
+	pr_warn("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
+		 ##__VA_ARGS__)
+#define gpiod_info(desc, fmt, ...)					       \
+	pr_info("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?", \
+		 ##__VA_ARGS__)
+#define gpiod_dbg(desc, fmt, ...)					       \
+	pr_debug("gpio-%d (%s): " fmt, desc_to_gpio(desc), desc->label ? : "?",\
+		 ##__VA_ARGS__)
+
+/* With chip prefix */
+
+#define chip_emerg(gc, fmt, ...)					\
+	dev_emerg(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
+#define chip_crit(gc, fmt, ...)					\
+	dev_crit(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
+#define chip_err(gc, fmt, ...)					\
+	dev_err(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
+#define chip_warn(gc, fmt, ...)					\
+	dev_warn(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
+#define chip_info(gc, fmt, ...)					\
+	dev_info(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
+#define chip_dbg(gc, fmt, ...)					\
+	dev_dbg(&gc->gpiodev->dev, "(%s): " fmt, gc->label, ##__VA_ARGS__)
+
+#endif /* GPIOLIB_H */