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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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8ce258f62f
Change the in-kernel consumer interface for GPIOs: make all variants of value setters that don't have a return value, return a signed integer instead. That will allow these routines to indicate failures to callers. This doesn't change the implementation just yet, we'll do it in subsequent commits. We need to update the gpio-latch module as it passes the address of value setters as a function pointer argument and thus cares about its type. Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com> Link: https://lore.kernel.org/r/20250220-gpio-set-retval-v2-2-bc4cfd38dae3@linaro.org Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
679 lines
19 KiB
C
679 lines
19 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_GPIO_CONSUMER_H
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#define __LINUX_GPIO_CONSUMER_H
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#include <linux/bits.h>
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#include <linux/err.h>
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#include <linux/types.h>
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struct acpi_device;
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struct device;
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struct fwnode_handle;
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struct gpio_array;
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struct gpio_desc;
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/**
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* struct gpio_descs - Struct containing an array of descriptors that can be
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* obtained using gpiod_get_array()
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*
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* @info: Pointer to the opaque gpio_array structure
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* @ndescs: Number of held descriptors
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* @desc: Array of pointers to GPIO descriptors
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*/
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struct gpio_descs {
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struct gpio_array *info;
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unsigned int ndescs;
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struct gpio_desc *desc[];
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};
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#define GPIOD_FLAGS_BIT_DIR_SET BIT(0)
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#define GPIOD_FLAGS_BIT_DIR_OUT BIT(1)
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#define GPIOD_FLAGS_BIT_DIR_VAL BIT(2)
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#define GPIOD_FLAGS_BIT_OPEN_DRAIN BIT(3)
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#define GPIOD_FLAGS_BIT_NONEXCLUSIVE BIT(4)
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/**
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* enum gpiod_flags - Optional flags that can be passed to one of gpiod_* to
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* configure direction and output value. These values
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* cannot be OR'd.
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*
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* @GPIOD_ASIS: Don't change anything
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* @GPIOD_IN: Set lines to input mode
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* @GPIOD_OUT_LOW: Set lines to output and drive them low
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* @GPIOD_OUT_HIGH: Set lines to output and drive them high
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* @GPIOD_OUT_LOW_OPEN_DRAIN: Set lines to open-drain output and drive them low
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* @GPIOD_OUT_HIGH_OPEN_DRAIN: Set lines to open-drain output and drive them high
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*/
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enum gpiod_flags {
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GPIOD_ASIS = 0,
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GPIOD_IN = GPIOD_FLAGS_BIT_DIR_SET,
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GPIOD_OUT_LOW = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT,
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GPIOD_OUT_HIGH = GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
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GPIOD_FLAGS_BIT_DIR_VAL,
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GPIOD_OUT_LOW_OPEN_DRAIN = GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_OPEN_DRAIN,
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GPIOD_OUT_HIGH_OPEN_DRAIN = GPIOD_OUT_HIGH | GPIOD_FLAGS_BIT_OPEN_DRAIN,
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};
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#ifdef CONFIG_GPIOLIB
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/* Return the number of GPIOs associated with a device / function */
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int gpiod_count(struct device *dev, const char *con_id);
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/* Acquire and dispose GPIOs */
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struct gpio_desc *__must_check gpiod_get(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
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const char *con_id,
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unsigned int idx,
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enum gpiod_flags flags);
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struct gpio_desc *__must_check gpiod_get_optional(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev,
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const char *con_id,
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unsigned int index,
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enum gpiod_flags flags);
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struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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void gpiod_put(struct gpio_desc *desc);
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void gpiod_put_array(struct gpio_descs *descs);
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struct gpio_desc *__must_check devm_gpiod_get(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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struct gpio_desc *__must_check devm_gpiod_get_index(struct device *dev,
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const char *con_id,
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unsigned int idx,
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enum gpiod_flags flags);
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struct gpio_desc *__must_check devm_gpiod_get_optional(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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struct gpio_desc *__must_check
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devm_gpiod_get_index_optional(struct device *dev, const char *con_id,
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unsigned int index, enum gpiod_flags flags);
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struct gpio_descs *__must_check devm_gpiod_get_array(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags);
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struct gpio_descs *__must_check
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devm_gpiod_get_array_optional(struct device *dev, const char *con_id,
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enum gpiod_flags flags);
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void devm_gpiod_put(struct device *dev, struct gpio_desc *desc);
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void devm_gpiod_unhinge(struct device *dev, struct gpio_desc *desc);
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void devm_gpiod_put_array(struct device *dev, struct gpio_descs *descs);
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int gpiod_get_direction(struct gpio_desc *desc);
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int gpiod_direction_input(struct gpio_desc *desc);
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int gpiod_direction_output(struct gpio_desc *desc, int value);
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int gpiod_direction_output_raw(struct gpio_desc *desc, int value);
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/* Value get/set from non-sleeping context */
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int gpiod_get_value(const struct gpio_desc *desc);
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int gpiod_get_array_value(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_value(struct gpio_desc *desc, int value);
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int gpiod_set_array_value(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_get_raw_value(const struct gpio_desc *desc);
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int gpiod_get_raw_array_value(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_raw_value(struct gpio_desc *desc, int value);
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int gpiod_set_raw_array_value(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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/* Value get/set from sleeping context */
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int gpiod_get_value_cansleep(const struct gpio_desc *desc);
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int gpiod_get_array_value_cansleep(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_value_cansleep(struct gpio_desc *desc, int value);
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int gpiod_set_array_value_cansleep(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_get_raw_value_cansleep(const struct gpio_desc *desc);
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int gpiod_get_raw_array_value_cansleep(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_raw_value_cansleep(struct gpio_desc *desc, int value);
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int gpiod_set_raw_array_value_cansleep(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_config(struct gpio_desc *desc, unsigned long config);
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int gpiod_set_debounce(struct gpio_desc *desc, unsigned int debounce);
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void gpiod_toggle_active_low(struct gpio_desc *desc);
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int gpiod_is_active_low(const struct gpio_desc *desc);
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int gpiod_cansleep(const struct gpio_desc *desc);
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int gpiod_to_irq(const struct gpio_desc *desc);
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int gpiod_set_consumer_name(struct gpio_desc *desc, const char *name);
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/* Convert between the old gpio_ and new gpiod_ interfaces */
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struct gpio_desc *gpio_to_desc(unsigned gpio);
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int desc_to_gpio(const struct gpio_desc *desc);
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struct gpio_desc *fwnode_gpiod_get_index(struct fwnode_handle *fwnode,
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const char *con_id, int index,
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enum gpiod_flags flags,
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const char *label);
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struct gpio_desc *devm_fwnode_gpiod_get_index(struct device *dev,
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struct fwnode_handle *child,
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const char *con_id, int index,
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enum gpiod_flags flags,
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const char *label);
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#else /* CONFIG_GPIOLIB */
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#include <linux/bug.h>
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#include <linux/kernel.h>
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static inline int gpiod_count(struct device *dev, const char *con_id)
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{
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return 0;
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}
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static inline struct gpio_desc *__must_check gpiod_get(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct gpio_desc *__must_check
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gpiod_get_index(struct device *dev,
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const char *con_id,
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unsigned int idx,
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enum gpiod_flags flags)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct gpio_desc *__must_check
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gpiod_get_optional(struct device *dev, const char *con_id,
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enum gpiod_flags flags)
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{
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return NULL;
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}
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static inline struct gpio_desc *__must_check
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gpiod_get_index_optional(struct device *dev, const char *con_id,
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unsigned int index, enum gpiod_flags flags)
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{
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return NULL;
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}
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static inline struct gpio_descs *__must_check
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gpiod_get_array(struct device *dev, const char *con_id,
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enum gpiod_flags flags)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct gpio_descs *__must_check
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gpiod_get_array_optional(struct device *dev, const char *con_id,
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enum gpiod_flags flags)
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{
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return NULL;
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}
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static inline void gpiod_put(struct gpio_desc *desc)
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{
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might_sleep();
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/* GPIO can never have been requested */
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WARN_ON(desc);
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}
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static inline void devm_gpiod_unhinge(struct device *dev,
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struct gpio_desc *desc)
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{
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might_sleep();
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/* GPIO can never have been requested */
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WARN_ON(desc);
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}
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static inline void gpiod_put_array(struct gpio_descs *descs)
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{
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might_sleep();
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/* GPIO can never have been requested */
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WARN_ON(descs);
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}
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static inline struct gpio_desc *__must_check
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devm_gpiod_get(struct device *dev,
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const char *con_id,
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enum gpiod_flags flags)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline
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struct gpio_desc *__must_check
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devm_gpiod_get_index(struct device *dev,
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const char *con_id,
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unsigned int idx,
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enum gpiod_flags flags)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct gpio_desc *__must_check
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devm_gpiod_get_optional(struct device *dev, const char *con_id,
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enum gpiod_flags flags)
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{
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return NULL;
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}
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static inline struct gpio_desc *__must_check
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devm_gpiod_get_index_optional(struct device *dev, const char *con_id,
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unsigned int index, enum gpiod_flags flags)
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{
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return NULL;
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}
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static inline struct gpio_descs *__must_check
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devm_gpiod_get_array(struct device *dev, const char *con_id,
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enum gpiod_flags flags)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline struct gpio_descs *__must_check
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devm_gpiod_get_array_optional(struct device *dev, const char *con_id,
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enum gpiod_flags flags)
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{
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return NULL;
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}
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static inline void devm_gpiod_put(struct device *dev, struct gpio_desc *desc)
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{
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might_sleep();
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/* GPIO can never have been requested */
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WARN_ON(desc);
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}
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static inline void devm_gpiod_put_array(struct device *dev,
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struct gpio_descs *descs)
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{
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might_sleep();
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/* GPIO can never have been requested */
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WARN_ON(descs);
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}
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static inline int gpiod_get_direction(const struct gpio_desc *desc)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc);
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return -ENOSYS;
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}
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static inline int gpiod_direction_input(struct gpio_desc *desc)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc);
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return -ENOSYS;
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}
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static inline int gpiod_direction_output(struct gpio_desc *desc, int value)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc);
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return -ENOSYS;
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}
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static inline int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc);
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return -ENOSYS;
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}
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static inline int gpiod_get_value(const struct gpio_desc *desc)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc);
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return 0;
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}
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static inline int gpiod_get_array_value(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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{
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/* GPIO can never have been requested */
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WARN_ON(desc_array);
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return 0;
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}
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static inline int gpiod_set_value(struct gpio_desc *desc, int value)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc);
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return 0;
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}
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static inline int gpiod_set_array_value(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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{
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/* GPIO can never have been requested */
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WARN_ON(desc_array);
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return 0;
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}
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static inline int gpiod_get_raw_value(const struct gpio_desc *desc)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc);
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return 0;
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}
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static inline int gpiod_get_raw_array_value(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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{
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/* GPIO can never have been requested */
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WARN_ON(desc_array);
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return 0;
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}
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static inline int gpiod_set_raw_value(struct gpio_desc *desc, int value)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc);
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return 0;
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}
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static inline int gpiod_set_raw_array_value(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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{
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/* GPIO can never have been requested */
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WARN_ON(desc_array);
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return 0;
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}
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static inline int gpiod_get_value_cansleep(const struct gpio_desc *desc)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc);
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return 0;
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}
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static inline int gpiod_get_array_value_cansleep(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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{
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/* GPIO can never have been requested */
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WARN_ON(desc_array);
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return 0;
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}
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static inline int gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc);
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return 0;
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}
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static inline int gpiod_set_array_value_cansleep(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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{
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/* GPIO can never have been requested */
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WARN_ON(desc_array);
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return 0;
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}
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static inline int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc);
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return 0;
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}
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static inline int gpiod_get_raw_array_value_cansleep(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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{
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/* GPIO can never have been requested */
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WARN_ON(desc_array);
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return 0;
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}
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static inline int gpiod_set_raw_value_cansleep(struct gpio_desc *desc,
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int value)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc);
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return 0;
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}
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static inline int gpiod_set_raw_array_value_cansleep(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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{
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/* GPIO can never have been requested */
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WARN_ON(desc_array);
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return 0;
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}
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static inline int gpiod_set_config(struct gpio_desc *desc, unsigned long config)
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{
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/* GPIO can never have been requested */
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WARN_ON(desc);
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return -ENOSYS;
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}
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static inline int gpiod_set_debounce(struct gpio_desc *desc, unsigned int debounce)
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{
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/* GPIO can never have been requested */
|
|
WARN_ON(desc);
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline void gpiod_toggle_active_low(struct gpio_desc *desc)
|
|
{
|
|
/* GPIO can never have been requested */
|
|
WARN_ON(desc);
|
|
}
|
|
|
|
static inline int gpiod_is_active_low(const struct gpio_desc *desc)
|
|
{
|
|
/* GPIO can never have been requested */
|
|
WARN_ON(desc);
|
|
return 0;
|
|
}
|
|
static inline int gpiod_cansleep(const struct gpio_desc *desc)
|
|
{
|
|
/* GPIO can never have been requested */
|
|
WARN_ON(desc);
|
|
return 0;
|
|
}
|
|
|
|
static inline int gpiod_to_irq(const struct gpio_desc *desc)
|
|
{
|
|
/* GPIO can never have been requested */
|
|
WARN_ON(desc);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline int gpiod_set_consumer_name(struct gpio_desc *desc,
|
|
const char *name)
|
|
{
|
|
/* GPIO can never have been requested */
|
|
WARN_ON(desc);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline struct gpio_desc *gpio_to_desc(unsigned gpio)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline int desc_to_gpio(const struct gpio_desc *desc)
|
|
{
|
|
/* GPIO can never have been requested */
|
|
WARN_ON(desc);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static inline
|
|
struct gpio_desc *fwnode_gpiod_get_index(struct fwnode_handle *fwnode,
|
|
const char *con_id, int index,
|
|
enum gpiod_flags flags,
|
|
const char *label)
|
|
{
|
|
return ERR_PTR(-ENOSYS);
|
|
}
|
|
|
|
static inline
|
|
struct gpio_desc *devm_fwnode_gpiod_get_index(struct device *dev,
|
|
struct fwnode_handle *fwnode,
|
|
const char *con_id, int index,
|
|
enum gpiod_flags flags,
|
|
const char *label)
|
|
{
|
|
return ERR_PTR(-ENOSYS);
|
|
}
|
|
|
|
#endif /* CONFIG_GPIOLIB */
|
|
|
|
#if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_HTE)
|
|
int gpiod_enable_hw_timestamp_ns(struct gpio_desc *desc, unsigned long flags);
|
|
int gpiod_disable_hw_timestamp_ns(struct gpio_desc *desc, unsigned long flags);
|
|
#else
|
|
|
|
#include <linux/bug.h>
|
|
|
|
static inline int gpiod_enable_hw_timestamp_ns(struct gpio_desc *desc,
|
|
unsigned long flags)
|
|
{
|
|
if (!IS_ENABLED(CONFIG_GPIOLIB))
|
|
WARN_ON(desc);
|
|
|
|
return -ENOSYS;
|
|
}
|
|
static inline int gpiod_disable_hw_timestamp_ns(struct gpio_desc *desc,
|
|
unsigned long flags)
|
|
{
|
|
if (!IS_ENABLED(CONFIG_GPIOLIB))
|
|
WARN_ON(desc);
|
|
|
|
return -ENOSYS;
|
|
}
|
|
#endif /* CONFIG_GPIOLIB && CONFIG_HTE */
|
|
|
|
static inline
|
|
struct gpio_desc *devm_fwnode_gpiod_get(struct device *dev,
|
|
struct fwnode_handle *fwnode,
|
|
const char *con_id,
|
|
enum gpiod_flags flags,
|
|
const char *label)
|
|
{
|
|
return devm_fwnode_gpiod_get_index(dev, fwnode, con_id, 0,
|
|
flags, label);
|
|
}
|
|
|
|
struct acpi_gpio_params {
|
|
unsigned int crs_entry_index;
|
|
unsigned int line_index;
|
|
bool active_low;
|
|
};
|
|
|
|
struct acpi_gpio_mapping {
|
|
const char *name;
|
|
const struct acpi_gpio_params *data;
|
|
unsigned int size;
|
|
|
|
/* Ignore IoRestriction field */
|
|
#define ACPI_GPIO_QUIRK_NO_IO_RESTRICTION BIT(0)
|
|
/*
|
|
* When ACPI GPIO mapping table is in use the index parameter inside it
|
|
* refers to the GPIO resource in _CRS method. That index has no
|
|
* distinction of actual type of the resource. When consumer wants to
|
|
* get GpioIo type explicitly, this quirk may be used.
|
|
*/
|
|
#define ACPI_GPIO_QUIRK_ONLY_GPIOIO BIT(1)
|
|
/* Use given pin as an absolute GPIO number in the system */
|
|
#define ACPI_GPIO_QUIRK_ABSOLUTE_NUMBER BIT(2)
|
|
|
|
unsigned int quirks;
|
|
};
|
|
|
|
#if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_ACPI)
|
|
|
|
int acpi_dev_add_driver_gpios(struct acpi_device *adev,
|
|
const struct acpi_gpio_mapping *gpios);
|
|
void acpi_dev_remove_driver_gpios(struct acpi_device *adev);
|
|
|
|
int devm_acpi_dev_add_driver_gpios(struct device *dev,
|
|
const struct acpi_gpio_mapping *gpios);
|
|
|
|
#else /* CONFIG_GPIOLIB && CONFIG_ACPI */
|
|
|
|
static inline int acpi_dev_add_driver_gpios(struct acpi_device *adev,
|
|
const struct acpi_gpio_mapping *gpios)
|
|
{
|
|
return -ENXIO;
|
|
}
|
|
static inline void acpi_dev_remove_driver_gpios(struct acpi_device *adev) {}
|
|
|
|
static inline int devm_acpi_dev_add_driver_gpios(struct device *dev,
|
|
const struct acpi_gpio_mapping *gpios)
|
|
{
|
|
return -ENXIO;
|
|
}
|
|
|
|
#endif /* CONFIG_GPIOLIB && CONFIG_ACPI */
|
|
|
|
|
|
#if IS_ENABLED(CONFIG_GPIOLIB) && IS_ENABLED(CONFIG_GPIO_SYSFS)
|
|
|
|
int gpiod_export(struct gpio_desc *desc, bool direction_may_change);
|
|
int gpiod_export_link(struct device *dev, const char *name,
|
|
struct gpio_desc *desc);
|
|
void gpiod_unexport(struct gpio_desc *desc);
|
|
|
|
#else /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
|
|
|
|
static inline int gpiod_export(struct gpio_desc *desc,
|
|
bool direction_may_change)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline int gpiod_export_link(struct device *dev, const char *name,
|
|
struct gpio_desc *desc)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline void gpiod_unexport(struct gpio_desc *desc)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_GPIOLIB && CONFIG_GPIO_SYSFS */
|
|
|
|
static inline int gpiod_multi_set_value_cansleep(struct gpio_descs *descs,
|
|
unsigned long *value_bitmap)
|
|
{
|
|
if (IS_ERR_OR_NULL(descs))
|
|
return PTR_ERR_OR_ZERO(descs);
|
|
|
|
return gpiod_set_array_value_cansleep(descs->ndescs, descs->desc,
|
|
descs->info, value_bitmap);
|
|
}
|
|
|
|
#endif
|