cregit-Linux how code gets into the kernel

Release 4.12 include/linux/gpio/driver.h

Directory: include/linux/gpio
#ifndef __LINUX_GPIO_DRIVER_H

#define __LINUX_GPIO_DRIVER_H

#include <linux/device.h>
#include <linux/types.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/lockdep.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/pinconf-generic.h>

struct gpio_desc;
struct of_phandle_args;
struct device_node;
struct seq_file;
struct gpio_device;
struct module;

#ifdef CONFIG_GPIOLIB

/**
 * 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
 * @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
 * @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 GPIOF_DIR_XXX), or negative error
 * @direction_input: configures signal "offset" as input, or returns error
 * @direction_output: configures signal "offset" as output, or returns error
 * @get: returns value for signal "offset", 0=low, 1=high, or negative error
 * @set: assigns output value for signal "offset"
 * @set_multiple: assigns output values for multiple signals defined by "mask"
 * @set_config: optional hook for all kinds of settings. Uses the same
 *      packed config format as generic pinconf.
 * @to_irq: optional hook supporting non-static gpio_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).
 * @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).
 * @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.  A name can include a single printk
 *      format specifier for an unsigned int.  It is substituted by the actual
 *      number of the gpio.
 * @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
 * @pin2mask: some generic GPIO controllers work with the big-endian bits
 *      notation, e.g. in a 8-bits register, GPIO7 is the least significant
 *      bit. This callback assigns the right bit mask.
 * @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: direction setting register for generic GPIO
 * @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.
 * @irqchip: GPIO IRQ chip impl, provided by GPIO driver
 * @irqdomain: Interrupt translation domain; responsible for mapping
 *      between GPIO hwirq number and linux irq number
 * @irq_base: first linux IRQ number assigned to GPIO IRQ chip (deprecated)
 * @irq_handler: the irq handler to use (often a predefined irq core function)
 *      for GPIO IRQs, provided by GPIO driver
 * @irq_default_type: default IRQ triggering type applied during GPIO driver
 *      initialization, provided by GPIO driver
 * @irq_chained_parent: GPIO IRQ chip parent/bank linux irq number,
 *      provided by GPIO driver for chained interrupt (not for nested
 *      interrupts).
 * @irq_nested: True if set the interrupt handling is nested.
 * @irq_need_valid_mask: If set core allocates @irq_valid_mask with all
 *      bits set to one
 * @irq_valid_mask: If not %NULL holds bitmask of GPIOs which are valid to
 *      be included in IRQ domain of the chip
 * @lock_key: per GPIO IRQ chip lockdep class
 *
 * A gpio_chip can help platforms abstract various sources of GPIOs so
 * they can all be accessed through a common programing 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 module		*owner;

	
int			(*request)(struct gpio_chip *chip,
						unsigned offset);
	
void			(*free)(struct gpio_chip *chip,
						unsigned offset);
	
int			(*get_direction)(struct gpio_chip *chip,
						unsigned offset);
	
int			(*direction_input)(struct gpio_chip *chip,
						unsigned offset);
	
int			(*direction_output)(struct gpio_chip *chip,
						unsigned offset, int value);
	
int			(*get)(struct gpio_chip *chip,
						unsigned offset);
	
void			(*set)(struct gpio_chip *chip,
						unsigned offset, int value);
	
void			(*set_multiple)(struct gpio_chip *chip,
						unsigned long *mask,
						unsigned long *bits);
	
int			(*set_config)(struct gpio_chip *chip,
					      unsigned offset,
					      unsigned long config);
	
int			(*to_irq)(struct gpio_chip *chip,
						unsigned offset);

	
void			(*dbg_show)(struct seq_file *s,
						struct gpio_chip *chip);
	
int			base;
	
u16			ngpio;
	
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);
	
unsigned long (*pin2mask)(struct gpio_chip *gc, unsigned int pin);
	
void __iomem *reg_dat;
	
void __iomem *reg_set;
	
void __iomem *reg_clr;
	
void __iomem *reg_dir;
	
int bgpio_bits;
	
spinlock_t bgpio_lock;
	
unsigned long bgpio_data;
	
unsigned long bgpio_dir;
#endif

#ifdef CONFIG_GPIOLIB_IRQCHIP
	/*
         * With CONFIG_GPIOLIB_IRQCHIP we get an irqchip inside the gpiolib
         * to handle IRQs for most practical cases.
         */
	
struct irq_chip		*irqchip;
	
struct irq_domain	*irqdomain;
	
unsigned int		irq_base;
	
irq_flow_handler_t	irq_handler;
	
unsigned int		irq_default_type;
	
unsigned int		irq_chained_parent;
	
bool			irq_nested;
	
bool			irq_need_valid_mask;
	
unsigned long		*irq_valid_mask;
	
struct lock_class_key	*lock_key;
#endif

#if defined(CONFIG_OF_GPIO)
	/*
         * If CONFIG_OF is enabled, then all GPIO controllers described in the
         * device tree automatically may have an OF translation
         */
	
struct device_node *of_node;
	
int of_gpio_n_cells;
	
int (*of_xlate)(struct gpio_chip *gc,
			const struct of_phandle_args *gpiospec, u32 *flags);
#endif
};

extern const char *gpiochip_is_requested(struct gpio_chip *chip,
			unsigned offset);

/* add/remove chips */
extern int gpiochip_add_data(struct gpio_chip *chip, void *data);



static inline int gpiochip_add(struct gpio_chip *chip)
{
	return gpiochip_add_data(chip, NULL);
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Walleij20100.00%1100.00%


Total20100.00%1100.00%



extern void gpiochip_remove(struct gpio_chip *chip);
extern int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip,
				  void *data);
extern void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip);

extern struct gpio_chip *gpiochip_find(void *data,
			      int (*match)(struct gpio_chip *chip, void *data));

/* lock/unlock as IRQ */
int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset);
void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset);
bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset);

/* Line status inquiry for drivers */
bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset);
bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset);

/* get driver data */
void *gpiochip_get_data(struct gpio_chip *chip);

struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);


struct bgpio_pdata {
	
const char *label;
	
int base;
	
int ngpio;
};

#if IS_ENABLED(CONFIG_GPIO_GENERIC)

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 */

#endif

#ifdef CONFIG_GPIOLIB_IRQCHIP

void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip,
		struct irq_chip *irqchip,
		unsigned int parent_irq,
		irq_flow_handler_t parent_handler);

void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip,
		struct irq_chip *irqchip,
		unsigned int parent_irq);

int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip,
			     struct irq_chip *irqchip,
			     unsigned int first_irq,
			     irq_flow_handler_t handler,
			     unsigned int type,
			     bool nested,
			     struct lock_class_key *lock_key);

#ifdef CONFIG_LOCKDEP

/*
 * Lockdep requires that each irqchip instance be created with a
 * unique key so as to avoid unnecessary warnings. This upfront
 * boilerplate static inlines provides such a key for each
 * unique instance.
 */



static inline int gpiochip_irqchip_add(struct gpio_chip *gpiochip,
				       struct irq_chip *irqchip,
				       unsigned int first_irq,
				       irq_flow_handler_t handler,
				       unsigned int type)
{
	static struct lock_class_key key;

	return gpiochip_irqchip_add_key(gpiochip, irqchip, first_irq,
					handler, type, false, &key);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Walleij52100.00%2100.00%


Total52100.00%2100.00%






static inline int gpiochip_irqchip_add_nested(struct gpio_chip *gpiochip,
			  struct irq_chip *irqchip,
			  unsigned int first_irq,
			  irq_flow_handler_t handler,
			  unsigned int type)
{

	static struct lock_class_key key;

	return gpiochip_irqchip_add_key(gpiochip, irqchip, first_irq,
					handler, type, true, &key);
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Walleij5096.15%150.00%


Grygorii Strashko23.85%150.00%


Total52100.00%2100.00%



#else



static inline int gpiochip_irqchip_add(struct gpio_chip *gpiochip,
				       struct irq_chip *irqchip,
				       unsigned int first_irq,
				       irq_flow_handler_t handler,
				       unsigned int type)
{
	return gpiochip_irqchip_add_key(gpiochip, irqchip, first_irq,
					handler, type, false, NULL);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Walleij4495.65%150.00%


Grygorii Strashko24.35%150.00%


Total46100.00%2100.00%






static inline int gpiochip_irqchip_add_nested(struct gpio_chip *gpiochip,
			  struct irq_chip *irqchip,
			  unsigned int first_irq,
			  irq_flow_handler_t handler,
			  unsigned int type)
{
	return gpiochip_irqchip_add_key(gpiochip, irqchip, first_irq,
					handler, type, true, NULL);
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Walleij4597.83%150.00%


Grygorii Strashko12.17%150.00%


Total46100.00%2100.00%



#endif /* CONFIG_LOCKDEP */

#endif /* CONFIG_GPIOLIB_IRQCHIP */

int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset);
void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset);
int gpiochip_generic_config(struct gpio_chip *chip, unsigned offset,
			    unsigned long config);

#ifdef CONFIG_PINCTRL

/**
 * struct gpio_pin_range - pin range controlled by a gpio chip
 * @head: 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;
};

int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
			   unsigned int gpio_offset, unsigned int pin_offset,
			   unsigned int npins);
int gpiochip_add_pingroup_range(struct gpio_chip *chip,
			struct pinctrl_dev *pctldev,
			unsigned int gpio_offset, const char *pin_group);
void gpiochip_remove_pin_ranges(struct gpio_chip *chip);

#else



static inline int

gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
		       unsigned int gpio_offset, unsigned int pin_offset,
		       unsigned int npins)
{
	return 0;
}

Contributors
PersonTokensPropCommitsCommitProp
Linus Walleij32100.00%1100.00%


Total32100.00%1100.00%





static inline int

gpiochip_add_pingroup_range(struct gpio_chip *chip,
			struct pinctrl_dev *pctldev,
			unsigned int gpio_offset, const char *pin_group)
{
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Walleij29100.00%1100.00%


Total29100.00%1100.00%





static inline void

gpiochip_remove_pin_ranges(struct gpio_chip *chip)
{
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Walleij11100.00%1100.00%


Total11100.00%1100.00%



#endif /* CONFIG_PINCTRL */

struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum,
					    const char *label);
void gpiochip_free_own_desc(struct gpio_desc *desc);

#else /* CONFIG_GPIOLIB */




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);
}


Contributors
PersonTokensPropCommitsCommitProp
Alexandre Courbot28100.00%1100.00%


Total28100.00%1100.00%



#endif /* CONFIG_GPIOLIB */

#endif

Overall Contributors
PersonTokensPropCommitsCommitProp
Linus Walleij73756.48%1441.18%


Alexandre Courbot39630.34%617.65%


Laxman Dewangan342.61%12.94%


Mika Westerberg312.38%25.88%


Jonas Gorski241.84%12.94%


Grygorii Strashko221.69%12.94%


Rojhalat Ibrahim221.69%12.94%


Guenter Roeck201.53%12.94%


Arnd Bergmann60.46%12.94%


Paul Gortmaker30.23%12.94%


Thierry Reding30.23%12.94%


Paul Bolle20.15%12.94%


Stephen Rothwell20.15%12.94%


Dmitry Baryshkov20.15%12.94%


abdoulaye berthe10.08%12.94%


Total1305100.00%34100.00%


Directory: include/linux/gpio



Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.