Quelle driver.h
Sprache: C
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_GPIO_DRIVER_H
#define __LINUX_GPIO_DRIVER_H
#include <linux/bits.h>
#include <linux/cleanup.h>
#include <linux/err.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/irqhandler.h>
#include <linux/lockdep.h>
#include <linux/pinctrl/pinconf-generic.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/property.h>
#include <linux/spinlock_types.h>
#include <linux/types.h>
#include <linux/util_macros.h>
#ifdef CONFIG_GENERIC_MSI_IRQ
#include <asm /msi.h>
#endif
struct device;
struct irq_chip;
struct irq_data;
struct module;
struct of_phandle_args;
struct pinctrl_dev;
struct seq_file;
struct gpio_chip;
struct gpio_desc;
struct gpio_device;
enum gpio_lookup_flags;
enum gpiod_flags;
union gpio_irq_fwspec {
struct irq_fwspec fwspec;
#ifdef CONFIG_GENERIC_MSI_IRQ
msi_alloc_info_t msiinfo;
#endif
};
#define GPIO_LINE_DIRECTION_IN 1
#define GPIO_LINE_DIRECTION_OUT 0
/**
* struct gpio_irq_chip - GPIO interrupt controller
*/
struct gpio_irq_chip {
/**
* @ chip :
*
* GPIO IRQ chip implementation , provided by GPIO driver .
*/
struct irq_chip *chip;
/**
* @ domain :
*
* Interrupt translation domain ; responsible for mapping between GPIO
* hwirq number and Linux IRQ number .
*/
struct irq_domain *domain;
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
/**
* @ fwnode :
*
* Firmware node corresponding to this gpiochip / irqchip , necessary
* for hierarchical irqdomain support .
*/
struct fwnode_handle *fwnode;
/**
* @ parent_domain :
*
* If non - NULL , will be set as the parent of this GPIO interrupt
* controller ' s IRQ domain to establish a hierarchical interrupt
* domain . The presence of this will activate the hierarchical
* interrupt support .
*/
struct irq_domain *parent_domain;
/**
* @ child_to_parent_hwirq :
*
* This callback translates a child hardware IRQ offset to a parent
* hardware IRQ offset on a hierarchical interrupt chip . The child
* hardware IRQs correspond to the GPIO index 0 . . ngpio - 1 ( see the
* ngpio field of struct gpio_chip ) and the corresponding parent
* hardware IRQ and type ( such as IRQ_TYPE_ * ) shall be returned by
* the driver . The driver can calculate this from an offset or using
* a lookup table or whatever method is best for this chip . Return
* 0 on successful translation in the driver .
*
* If some ranges of hardware IRQs do not have a corresponding parent
* HWIRQ , return - EINVAL , but also make sure to fill in @ valid_mask and
* @ need_valid_mask to make these GPIO lines unavailable for
* translation .
*/
int (*child_to_parent_hwirq)(struct gpio_chip *gc,
unsigned int child_hwirq,
unsigned int child_type,
unsigned int *parent_hwirq,
unsigned int *parent_type);
/**
* @ populate_parent_alloc_arg :
*
* This optional callback allocates and populates the specific struct
* for the parent ' s IRQ domain . If this is not specified , then
* & gpiochip_populate_parent_fwspec_twocell will be used . A four - cell
* variant named & gpiochip_populate_parent_fwspec_fourcell is also
* available .
*/
int (*populate_parent_alloc_arg)(struct gpio_chip *gc,
union gpio_irq_fwspec *fwspec,
unsigned int parent_hwirq,
unsigned int parent_type);
/**
* @ child_offset_to_irq :
*
* This optional callback is used to translate the child ' s GPIO line
* offset on the GPIO chip to an IRQ number for the GPIO to_irq ( )
* callback . If this is not specified , then a default callback will be
* provided that returns the line offset .
*/
unsigned int (*child_offset_to_irq)(struct gpio_chip *gc,
unsigned int pin);
/**
* @ child_irq_domain_ops :
*
* The IRQ domain operations that will be used for this GPIO IRQ
* chip . If no operations are provided , then default callbacks will
* be populated to setup the IRQ hierarchy . Some drivers need to
* supply their own translate function .
*/
struct irq_domain_ops child_irq_domain_ops;
#endif
/**
* @ handler :
*
* The IRQ handler to use ( often a predefined IRQ core function ) for
* GPIO IRQs , provided by GPIO driver .
*/
irq_flow_handler_t handler;
/**
* @ default_type :
*
* Default IRQ triggering type applied during GPIO driver
* initialization , provided by GPIO driver .
*/
unsigned int default_type;
/**
* @ lock_key :
*
* Per GPIO IRQ chip lockdep class for IRQ lock .
*/
struct lock_class_key *lock_key;
/**
* @ request_key :
*
* Per GPIO IRQ chip lockdep class for IRQ request .
*/
struct lock_class_key *request_key;
/**
* @ parent_handler :
*
* The interrupt handler for the GPIO chip ' s parent interrupts , may be
* NULL if the parent interrupts are nested rather than cascaded .
*/
irq_flow_handler_t parent_handler;
union {
/**
* @ parent_handler_data :
*
* If @ per_parent_data is false , @ parent_handler_data is a
* single pointer used as the data associated with every
* parent interrupt .
*/
void *parent_handler_data;
/**
* @ parent_handler_data_array :
*
* If @ per_parent_data is true , @ parent_handler_data_array is
* an array of @ num_parents pointers , and is used to associate
* different data for each parent . This cannot be NULL if
* @ per_parent_data is true .
*/
void **parent_handler_data_array;
};
/**
* @ num_parents :
*
* The number of interrupt parents of a GPIO chip .
*/
unsigned int num_parents;
/**
* @ parents :
*
* A list of interrupt parents of a GPIO chip . This is owned by the
* driver , so the core will only reference this list , not modify it .
*/
unsigned int *parents;
/**
* @ map :
*
* A list of interrupt parents for each line of a GPIO chip .
*/
unsigned int *map;
/**
* @ threaded :
*
* True if set the interrupt handling uses nested threads .
*/
bool threaded;
/**
* @ per_parent_data :
*
* True if parent_handler_data_array describes a @ num_parents
* sized array to be used as parent data .
*/
bool per_parent_data;
/**
* @ initialized :
*
* Flag to track GPIO chip irq member ' s initialization .
* This flag will make sure GPIO chip irq members are not used
* before they are initialized .
*/
bool initialized;
/**
* @ domain_is_allocated_externally :
*
* True it the irq_domain was allocated outside of gpiolib , in which
* case gpiolib won ' t free the irq_domain itself .
*/
bool domain_is_allocated_externally;
/**
* @ init_hw : optional routine to initialize hardware before
* an IRQ chip will be added . This is quite useful when
* a particular driver wants to clear IRQ related registers
* in order to avoid undesired events .
*/
int (*init_hw)(struct gpio_chip *gc);
/**
* @ init_valid_mask : optional routine to initialize @ valid_mask , to be
* used if not all GPIO lines are valid interrupts . Sometimes some
* lines just cannot fire interrupts , and this routine , when defined ,
* is passed a bitmap in " valid_mask " and it will have ngpios
* bits from 0 . . ( ngpios - 1 ) set to " 1 " as in valid . The callback can
* then directly set some bits to " 0 " if they cannot be used for
* interrupts .
*/
void (*init_valid_mask)(struct gpio_chip *gc,
unsigned long *valid_mask,
unsigned int ngpios);
/**
* @ valid_mask :
*
* If not % NULL , holds bitmask of GPIOs which are valid to be included
* in IRQ domain of the chip .
*/
unsigned long *valid_mask;
/**
* @ first :
*
* Required for static IRQ allocation . If set ,
* irq_domain_create_simple ( ) will allocate and map all IRQs
* during initialization .
*/
unsigned int first;
/**
* @ irq_enable :
*
* Store old irq_chip irq_enable callback
*/
void (*irq_enable)(struct irq_data *data);
/**
* @ irq_disable :
*
* Store old irq_chip irq_disable callback
*/
void (*irq_disable)(struct irq_data *data);
/**
* @ irq_unmask :
*
* Store old irq_chip irq_unmask callback
*/
void (*irq_unmask)(struct irq_data *data);
/**
* @ irq_mask :
*
* Store old irq_chip irq_mask callback
*/
void (*irq_mask)(struct irq_data *data);
};
/**
* struct gpio_chip - abstract a GPIO controller
* @ label : a functional name for the GPIO device , such as a part
* number or the name of the SoC IP - block implementing it .
* @ gpiodev : the internal state holder , opaque struct
* @ parent : optional parent device providing the GPIOs
* @ fwnode : optional fwnode providing this controller ' s properties
* @ owner : helps prevent removal of modules exporting active GPIOs
* @ request : optional hook for chip - specific activation , such as
* enabling module power and clock ; may sleep ; must return 0 on success
* or negative error number on failure
* @ free : optional hook for chip - specific deactivation , such as
* disabling module power and clock ; may sleep
* @ get_direction : returns direction for signal " offset " , 0 = out , 1 = in ,
* ( same as GPIO_LINE_DIRECTION_OUT / GPIO_LINE_DIRECTION_IN ) ,
* or negative error . It is recommended to always implement this
* function , even on input - only or output - only gpio chips .
* @ direction_input : configures signal " offset " as input , returns 0 on success
* or a negative error number . This can be omitted on input - only or
* output - only gpio chips .
* @ direction_output : configures signal " offset " as output , returns 0 on
* success or a negative error number . This can be omitted on input - only
* or output - only gpio chips .
* @ get : returns value for signal " offset " , 0 = low , 1 = high , or negative error
* @ get_multiple : reads values for multiple signals defined by " mask " and
* stores them in " bits " , returns 0 on success or negative error
* @ set : assigns output value for signal " offset " , returns 0 on success or
* negative error value
* @ set_multiple : assigns output values for multiple signals defined by
* " mask " , returns 0 on success or negative error value
* @ set_config : optional hook for all kinds of settings . Uses the same
* packed config format as generic pinconf . Must return 0 on success and
* a negative error number on failure .
* @ to_irq : optional hook supporting non - static gpiod_to_irq ( ) mappings ;
* implementation may not sleep
* @ dbg_show : optional routine to show contents in debugfs ; default code
* will be used when this is omitted , but custom code can show extra
* state ( such as pullup / pulldown configuration ) .
* @ init_valid_mask : optional routine to initialize @ valid_mask , to be used if
* not all GPIOs are valid .
* @ add_pin_ranges : optional routine to initialize pin ranges , to be used when
* requires special mapping of the pins that provides GPIO functionality .
* It is called after adding GPIO chip and before adding IRQ chip .
* @ en_hw_timestamp : Dependent on GPIO chip , an optional routine to
* enable hardware timestamp .
* @ dis_hw_timestamp : Dependent on GPIO chip , an optional routine to
* disable hardware timestamp .
* @ base : identifies the first GPIO number handled by this chip ;
* or , if negative during registration , requests dynamic ID allocation .
* DEPRECATION : providing anything non - negative and nailing the base
* offset of GPIO chips is deprecated . Please pass - 1 as base to
* let gpiolib select the chip base in all possible cases . We want to
* get rid of the static GPIO number space in the long run .
* @ ngpio : the number of GPIOs handled by this controller ; the last GPIO
* handled is ( base + ngpio - 1 ) .
* @ offset : when multiple gpio chips belong to the same device this
* can be used as offset within the device so friendly names can
* be properly assigned .
* @ names : if set , must be an array of strings to use as alternative
* names for the GPIOs in this chip . Any entry in the array
* may be NULL if there is no alias for the GPIO , however the
* array must be @ ngpio entries long .
* @ can_sleep : flag must be set iff get ( ) / set ( ) methods sleep , as they
* must while accessing GPIO expander chips over I2C or SPI . This
* implies that if the chip supports IRQs , these IRQs need to be threaded
* as the chip access may sleep when e . g . reading out the IRQ status
* registers .
* @ read_reg : reader function for generic GPIO
* @ write_reg : writer function for generic GPIO
* @ be_bits : if the generic GPIO has big endian bit order ( bit 31 is representing
* line 0 , bit 30 is line 1 . . . bit 0 is line 31 ) this is set to true by the
* generic GPIO core . It is for internal housekeeping only .
* @ reg_dat : data ( in ) register for generic GPIO
* @ reg_set : output set register ( out = high ) for generic GPIO
* @ reg_clr : output clear register ( out = low ) for generic GPIO
* @ reg_dir_out : direction out setting register for generic GPIO
* @ reg_dir_in : direction in setting register for generic GPIO
* @ bgpio_dir_unreadable : indicates that the direction register ( s ) cannot
* be read and we need to rely on out internal state tracking .
* @ bgpio_pinctrl : the generic GPIO uses a pin control backend .
* @ bgpio_bits : number of register bits used for a generic GPIO i . e .
* < register width > * 8
* @ bgpio_lock : used to lock chip - > bgpio_data . Also , this is needed to keep
* shadowed and real data registers writes together .
* @ bgpio_data : shadowed data register for generic GPIO to clear / set bits
* safely .
* @ bgpio_dir : shadowed direction register for generic GPIO to clear / set
* direction safely . A " 1 " in this word means the line is set as
* output .
*
* A gpio_chip can help platforms abstract various sources of GPIOs so
* they can all be accessed through a common programming interface .
* Example sources would be SOC controllers , FPGAs , multifunction
* chips , dedicated GPIO expanders , and so on .
*
* Each chip controls a number of signals , identified in method calls
* by " offset " values in the range 0 . . ( @ ngpio - 1 ) . When those signals
* are referenced through calls like gpio_get_value ( gpio ) , the offset
* is calculated by subtracting @ base from the gpio number .
*/
struct gpio_chip {
const char *label;
struct gpio_device *gpiodev;
struct device *parent;
struct fwnode_handle *fwnode;
struct module *owner;
int (*request)(struct gpio_chip *gc,
unsigned int offset);
void (*free)(struct gpio_chip *gc,
unsigned int offset);
int (*get_direction)(struct gpio_chip *gc,
unsigned int offset);
int (*direction_input)(struct gpio_chip *gc,
unsigned int offset);
int (*direction_output)(struct gpio_chip *gc,
unsigned int offset, int value);
int (*get)(struct gpio_chip *gc,
unsigned int offset);
int (*get_multiple)(struct gpio_chip *gc,
unsigned long *mask,
unsigned long *bits);
int (*set)(struct gpio_chip *gc,
unsigned int offset, int value);
int (*set_multiple)(struct gpio_chip *gc,
unsigned long *mask,
unsigned long *bits);
int (*set_config)(struct gpio_chip *gc,
unsigned int offset,
unsigned long config);
int (*to_irq)(struct gpio_chip *gc,
unsigned int offset);
void (*dbg_show)(struct seq_file *s,
struct gpio_chip *gc);
int (*init_valid_mask)(struct gpio_chip *gc,
unsigned long *valid_mask,
unsigned int ngpios);
int (*add_pin_ranges)(struct gpio_chip *gc);
int (*en_hw_timestamp)(struct gpio_chip *gc,
u32 offset,
unsigned long flags);
int (*dis_hw_timestamp)(struct gpio_chip *gc,
u32 offset,
unsigned long flags);
int base;
u16 ngpio;
u16 offset;
const char *const *names;
bool can_sleep;
#if IS_ENABLED(CONFIG_GPIO_GENERIC)
unsigned long (*read_reg)(void __iomem *reg);
void (*write_reg)(void __iomem *reg, unsigned long data);
bool be_bits;
void __iomem *reg_dat;
void __iomem *reg_set;
void __iomem *reg_clr;
void __iomem *reg_dir_out;
void __iomem *reg_dir_in;
bool bgpio_dir_unreadable;
bool bgpio_pinctrl;
int bgpio_bits;
raw_spinlock_t bgpio_lock;
unsigned long bgpio_data;
unsigned long bgpio_dir;
#endif /* CONFIG_GPIO_GENERIC */
#ifdef CONFIG_GPIOLIB_IRQCHIP
/*
* With CONFIG_GPIOLIB_IRQCHIP we get an irqchip inside the gpiolib
* to handle IRQs for most practical cases .
*/
/**
* @ irq :
*
* Integrates interrupt chip functionality with the GPIO chip . Can be
* used to handle IRQs for most practical cases .
*/
struct gpio_irq_chip irq;
#endif /* CONFIG_GPIOLIB_IRQCHIP */
#if defined (CONFIG_OF_GPIO)
/*
* If CONFIG_OF_GPIO is enabled , then all GPIO controllers described in
* the device tree automatically may have an OF translation
*/
/**
* @ of_gpio_n_cells :
*
* Number of cells used to form the GPIO specifier . The standard is 2
* cells :
*
* gpios = < & gpio offset flags > ;
*
* some complex GPIO controllers instantiate more than one chip per
* device tree node and have 3 cells :
*
* gpios = < & gpio instance offset flags > ;
*
* Legacy GPIO controllers may even have 1 cell :
*
* gpios = < & gpio offset > ;
*/
unsigned int of_gpio_n_cells;
/**
* @ of_node_instance_match :
*
* Determine if a chip is the right instance . Must be implemented by
* any driver using more than one gpio_chip per device tree node .
* Returns true if gc is the instance indicated by i ( which is the
* first cell in the phandles for GPIO lines and gpio - ranges ) .
*/
bool (*of_node_instance_match)(struct gpio_chip *gc, unsigned int i);
/**
* @ of_xlate :
*
* Callback to translate a device tree GPIO specifier into a chip -
* relative GPIO number and flags .
*/
int (*of_xlate)(struct gpio_chip *gc,
const struct of_phandle_args *gpiospec, u32 *flags);
#endif /* CONFIG_OF_GPIO */
};
char *gpiochip_dup_line_label(struct gpio_chip *gc, unsigned int offset);
struct _gpiochip_for_each_data {
const char **label;
unsigned int *i;
};
DEFINE_CLASS(_gpiochip_for_each_data,
struct _gpiochip_for_each_data,
if (*_T.label) kfree(*_T.label),
({
struct _gpiochip_for_each_data _data = { label, i };
*_data.i = 0 ;
_data;
}),
const char **label, int *i)
/**
* for_each_hwgpio_in_range - Iterates over all GPIOs in a given range
* @ _ chip : Chip to iterate over .
* @ _ i : Loop counter .
* @ _ base : First GPIO in the ranger .
* @ _ size : Amount of GPIOs to check starting from @ base .
* @ _ label : Place to store the address of the label if the GPIO is requested .
* Set to NULL for unused GPIOs .
*/
#define for_each_hwgpio_in_range(_chip, _i, _base, _size, _label) \
for (CLASS (_gpiochip_for_each_data, _data)(&_label, &_i); \
_i < _size; \
_i++, kfree(_label), _label = NULL) \
for_each_if(!IS_ERR(_label = gpiochip_dup_line_label(_chip, _base + _i)))
/**
* for_each_hwgpio - Iterates over all GPIOs for given chip .
* @ _ chip : Chip to iterate over .
* @ _ i : Loop counter .
* @ _ label : Place to store the address of the label if the GPIO is requested .
* Set to NULL for unused GPIOs .
*/
#define for_each_hwgpio(_chip, _i, _label) \
for_each_hwgpio_in_range(_chip, _i, 0 , _chip->ngpio, _label)
/**
* for_each_requested_gpio_in_range - iterates over requested GPIOs in a given range
* @ _ chip : the chip to query
* @ _ i : loop variable
* @ _ base : first GPIO in the range
* @ _ size : amount of GPIOs to check starting from @ base
* @ _ label : label of current GPIO
*/
#define for_each_requested_gpio_in_range(_chip, _i, _base, _size, _label) \
for_each_hwgpio_in_range(_chip, _i, _base, _size, _label) \
for_each_if(_label)
/* Iterates over all requested GPIO of the given @chip */
#define for_each_requested_gpio(chip, i, label) \
for_each_requested_gpio_in_range(chip, i, 0 , chip->ngpio, label)
/* add/remove chips */
int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
struct lock_class_key *lock_key,
struct lock_class_key *request_key);
/**
* gpiochip_add_data ( ) - register a gpio_chip
* @ gc : the chip to register , with gc - > base initialized
* @ data : driver - private data associated with this chip
*
* Context : potentially before irqs will work
*
* When gpiochip_add_data ( ) is called very early during boot , so that GPIOs
* can be freely used , the gc - > parent device must be registered before
* the gpio framework ' s arch_initcall ( ) . Otherwise sysfs initialization
* for GPIOs will fail rudely .
*
* gpiochip_add_data ( ) must only be called after gpiolib initialization ,
* i . e . after core_initcall ( ) .
*
* If gc - > base is negative , this requests dynamic assignment of
* a range of valid GPIOs .
*
* Returns :
* A negative errno if the chip can ' t be registered , such as because the
* gc - > base is invalid or already associated with a different chip .
* Otherwise it returns zero as a success code .
*/
#ifdef CONFIG_LOCKDEP
#define gpiochip_add_data(gc, data) ({ \
static struct lock_class_key lock_key; \
static struct lock_class_key request_key; \
gpiochip_add_data_with_key(gc, data, &lock_key, \
&request_key); \
})
#define devm_gpiochip_add_data(dev, gc, data) ({ \
static struct lock_class_key lock_key; \
static struct lock_class_key request_key; \
devm_gpiochip_add_data_with_key(dev, gc, data, &lock_key, \
&request_key); \
})
#else
#define gpiochip_add_data(gc, data) gpiochip_add_data_with_key(gc, data, NULL, NULL)
#define devm_gpiochip_add_data(dev, gc, data) \
devm_gpiochip_add_data_with_key(dev, gc, data, NULL, NULL)
#endif /* CONFIG_LOCKDEP */
void gpiochip_remove(struct gpio_chip *gc);
int devm_gpiochip_add_data_with_key(struct device *dev, struct gpio_chip *gc,
void *data, struct lock_class_key *lock_key,
struct lock_class_key *request_key);
struct gpio_device *gpio_device_find(const void *data,
int (*match)(struct gpio_chip *gc,
const void *data));
struct gpio_device *gpio_device_get(struct gpio_device *gdev);
void gpio_device_put(struct gpio_device *gdev);
DEFINE_FREE(gpio_device_put, struct gpio_device *,
if (!IS_ERR_OR_NULL(_T)) gpio_device_put(_T))
struct device *gpio_device_to_device(struct gpio_device *gdev);
bool gpiochip_line_is_irq(struct gpio_chip *gc, unsigned int offset);
int gpiochip_reqres_irq(struct gpio_chip *gc, unsigned int offset);
void gpiochip_relres_irq(struct gpio_chip *gc, unsigned int offset);
void gpiochip_disable_irq(struct gpio_chip *gc, unsigned int offset);
void gpiochip_enable_irq(struct gpio_chip *gc, unsigned int offset);
/* irq_data versions of the above */
int gpiochip_irq_reqres(struct irq_data *data);
void gpiochip_irq_relres(struct irq_data *data);
/* Paste this in your irq_chip structure */
#define GPIOCHIP_IRQ_RESOURCE_HELPERS \
.irq_request_resources = gpiochip_irq_reqres, \
.irq_release_resources = gpiochip_irq_relres
static inline void gpio_irq_chip_set_chip(struct gpio_irq_chip *girq,
const struct irq_chip *chip)
{
/* Yes, dropping const is ugly, but it isn't like we have a choice */
girq->chip = (struct irq_chip *)chip;
}
/* Line status inquiry for drivers */
bool gpiochip_line_is_open_drain(struct gpio_chip *gc, unsigned int offset);
bool gpiochip_line_is_open_source(struct gpio_chip *gc, unsigned int offset);
/* Sleep persistence inquiry for drivers */
bool gpiochip_line_is_persistent(struct gpio_chip *gc, unsigned int offset);
bool gpiochip_line_is_valid(const struct gpio_chip *gc, unsigned int offset);
const unsigned long *gpiochip_query_valid_mask(const struct gpio_chip *gc);
/* get driver data */
void *gpiochip_get_data(struct gpio_chip *gc);
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
int gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *gc,
union gpio_irq_fwspec *gfwspec,
unsigned int parent_hwirq,
unsigned int parent_type);
int gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *gc,
union gpio_irq_fwspec *gfwspec,
unsigned int parent_hwirq,
unsigned int parent_type);
#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
int bgpio_init(struct gpio_chip *gc, struct device *dev,
unsigned long sz, void __iomem *dat, void __iomem *set,
void __iomem *clr, void __iomem *dirout, void __iomem *dirin,
unsigned long flags);
#define BGPIOF_BIG_ENDIAN BIT(0 )
#define BGPIOF_UNREADABLE_REG_SET BIT(1 ) /* reg_set is unreadable */
#define BGPIOF_UNREADABLE_REG_DIR BIT(2 ) /* reg_dir is unreadable */
#define BGPIOF_BIG_ENDIAN_BYTE_ORDER BIT(3 )
#define BGPIOF_READ_OUTPUT_REG_SET BIT(4 ) /* reg_set stores output value */
#define BGPIOF_NO_OUTPUT BIT(5 ) /* only input */
#define BGPIOF_NO_SET_ON_INPUT BIT(6 )
#define BGPIOF_PINCTRL_BACKEND BIT(7 ) /* Call pinctrl direction setters */
#define BGPIOF_NO_INPUT BIT(8 ) /* only output */
#ifdef CONFIG_GPIOLIB_IRQCHIP
int gpiochip_irqchip_add_domain(struct gpio_chip *gc,
struct irq_domain *domain);
#else
#include <asm /bug.h>
static inline int gpiochip_irqchip_add_domain(struct gpio_chip *gc,
struct irq_domain *domain)
{
WARN_ON(1 );
return -EINVAL;
}
#endif
int gpiochip_generic_request(struct gpio_chip *gc, unsigned int offset);
void gpiochip_generic_free(struct gpio_chip *gc, unsigned int offset);
int gpiochip_generic_config(struct gpio_chip *gc, unsigned int offset,
unsigned long config);
/**
* struct gpio_pin_range - pin range controlled by a gpio chip
* @ node : list for maintaining set of pin ranges , used internally
* @ pctldev : pinctrl device which handles corresponding pins
* @ range : actual range of pins controlled by a gpio controller
*/
struct gpio_pin_range {
struct list_head node;
struct pinctrl_dev *pctldev;
struct pinctrl_gpio_range range;
};
#ifdef CONFIG_PINCTRL
int gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name,
unsigned int gpio_offset, unsigned int pin_offset,
unsigned int npins);
int gpiochip_add_pingroup_range(struct gpio_chip *gc,
struct pinctrl_dev *pctldev,
unsigned int gpio_offset, const char *pin_group);
void gpiochip_remove_pin_ranges(struct gpio_chip *gc);
#else /* ! CONFIG_PINCTRL */
static inline int
gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name,
unsigned int gpio_offset, unsigned int pin_offset,
unsigned int npins)
{
return 0 ;
}
static inline int
gpiochip_add_pingroup_range(struct gpio_chip *gc,
struct pinctrl_dev *pctldev,
unsigned int gpio_offset, const char *pin_group)
{
return 0 ;
}
static inline void
gpiochip_remove_pin_ranges(struct gpio_chip *gc)
{
}
#endif /* CONFIG_PINCTRL */
struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc,
unsigned int hwnum,
const char *label,
enum gpio_lookup_flags lflags,
enum gpiod_flags dflags);
void gpiochip_free_own_desc(struct gpio_desc *desc);
struct gpio_desc *
gpio_device_get_desc(struct gpio_device *gdev, unsigned int hwnum);
struct gpio_chip *gpio_device_get_chip(struct gpio_device *gdev);
#ifdef CONFIG_GPIOLIB
/* lock/unlock as IRQ */
int gpiochip_lock_as_irq(struct gpio_chip *gc, unsigned int offset);
void gpiochip_unlock_as_irq(struct gpio_chip *gc, unsigned int offset);
struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);
struct gpio_device *gpiod_to_gpio_device(struct gpio_desc *desc);
/* struct gpio_device getters */
int gpio_device_get_base(struct gpio_device *gdev);
const char *gpio_device_get_label(struct gpio_device *gdev);
struct gpio_device *gpio_device_find_by_label(const char *label);
struct gpio_device *gpio_device_find_by_fwnode(const struct fwnode_handle *fwnode);
#else /* CONFIG_GPIOLIB */
#include <asm /bug.h>
static inline struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
{
/* GPIO can never have been requested */
WARN_ON(1 );
return ERR_PTR(-ENODEV);
}
static inline struct gpio_device *gpiod_to_gpio_device(struct gpio_desc *desc)
{
WARN_ON(1 );
return ERR_PTR(-ENODEV);
}
static inline int gpio_device_get_base(struct gpio_device *gdev)
{
WARN_ON(1 );
return -ENODEV;
}
static inline const char *gpio_device_get_label(struct gpio_device *gdev)
{
WARN_ON(1 );
return NULL;
}
static inline struct gpio_device *gpio_device_find_by_label(const char *label)
{
WARN_ON(1 );
return NULL;
}
static inline struct gpio_device *gpio_device_find_by_fwnode(const struct fwnode_handle *fwnode)
{
WARN_ON(1 );
return NULL;
}
static inline int gpiochip_lock_as_irq(struct gpio_chip *gc,
unsigned int offset)
{
WARN_ON(1 );
return -EINVAL;
}
static inline void gpiochip_unlock_as_irq(struct gpio_chip *gc,
unsigned int offset)
{
WARN_ON(1 );
}
#endif /* CONFIG_GPIOLIB */
#define for_each_gpiochip_node(dev, child) \
device_for_each_child_node(dev, child) \
for_each_if(fwnode_property_present(child, "gpio-controller" ))
static inline unsigned int gpiochip_node_count(struct device *dev)
{
struct fwnode_handle *child;
unsigned int count = 0 ;
for_each_gpiochip_node(dev, child)
count++;
return count;
}
static inline struct fwnode_handle *gpiochip_node_get_first(struct device *dev)
{
struct fwnode_handle *fwnode;
for_each_gpiochip_node(dev, fwnode)
return fwnode;
return NULL;
}
#endif /* __LINUX_GPIO_DRIVER_H */
Messung V0.5 in Prozent C=92 H=99 G=95
¤ Dauer der Verarbeitung: 0.25 Sekunden
(vorverarbeitet am 2026-09-29)
¤
*© Formatika GbR, Deutschland
2026-10-10
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