#ifndef __LINUX_GPIO_DRIVER_H #define __LINUX_GPIO_DRIVER_H #include #include #include #include #include #include #include #include struct device; struct gpio_desc; struct of_phandle_args; struct device_node; struct seq_file; #ifdef CONFIG_GPIOLIB /** * struct gpio_chip - abstract a GPIO controller * @label: for diagnostics * @parent: optional parent device providing the GPIOs * @cdev: class device used by sysfs interface (may be NULL) * @owner: helps prevent removal of modules exporting active GPIOs * @data: per-instance data assigned by the driver * @list: links gpio_chips together for traversal * @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_debounce: optional hook for setting debounce time for specified gpio in * interrupt triggered gpio chips * @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). * @desc: array of ngpio descriptors. Private. * @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. * @irq_not_threaded: flag must be set if @can_sleep is set but the * IRQs don't need to be threaded * @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_clk: 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. * * 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_parent: GPIO IRQ chip parent/bank linux irq number, * provided by GPIO driver * @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 device *parent; struct device *cdev; struct module *owner; void *data; struct list_head list; 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_debounce)(struct gpio_chip *chip, unsigned offset, unsigned debounce); int (*to_irq)(struct gpio_chip *chip, unsigned offset); void (*dbg_show)(struct seq_file *s, struct gpio_chip *chip); int base; u16 ngpio; struct gpio_desc *desc; const char *const *names; bool can_sleep; bool irq_not_threaded; #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; int irq_parent; 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 #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 }; 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); } extern void gpiochip_remove(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); /* get driver data */ static inline void *gpiochip_get_data(struct gpio_chip *chip) { return chip->data; } struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc); #if IS_ENABLED(CONFIG_GPIO_GENERIC) struct bgpio_pdata { const char *label; int base; int ngpio; }; 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, int parent_irq, irq_flow_handler_t parent_handler); int _gpiochip_irqchip_add(struct gpio_chip *gpiochip, struct irq_chip *irqchip, unsigned int first_irq, irq_flow_handler_t handler, unsigned int type, struct lock_class_key *lock_key); #ifdef CONFIG_LOCKDEP #define gpiochip_irqchip_add(...) \ ( \ ({ \ static struct lock_class_key _key; \ _gpiochip_irqchip_add(__VA_ARGS__, &_key); \ }) \ ) #else #define gpiochip_irqchip_add(...) \ _gpiochip_irqchip_add(__VA_ARGS__, NULL) #endif #endif /* CONFIG_GPIOLIB_IRQCHIP */ int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset); void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset); #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; } 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; } static inline void gpiochip_remove_pin_ranges(struct gpio_chip *chip) { } #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); } #endif /* CONFIG_GPIOLIB */ #endif