/** * @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, unsignedint child_hwirq, unsignedint child_type, unsignedint *parent_hwirq, unsignedint *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, unsignedint parent_hwirq, unsignedint 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.
*/ unsignedint (*child_offset_to_irq)(struct gpio_chip *gc, unsignedint 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.
*/ unsignedint 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.
*/ unsignedint 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.
*/ unsignedint *parents;
/** * @map: * * A list of interrupt parents for each line of a GPIO chip.
*/ unsignedint *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, unsignedlong *valid_mask, unsignedint ngpios);
/** * @valid_mask: * * If not %NULL, holds bitmask of GPIOs which are valid to be included * in IRQ domain of the chip.
*/ unsignedlong *valid_mask;
/** * @first: * * Required for static IRQ allocation. If set, * irq_domain_create_simple() will allocate and map all IRQs * during initialization.
*/ unsignedint 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 { constchar *label; struct gpio_device *gpiodev; struct device *parent; struct fwnode_handle *fwnode; struct module *owner;
int (*request)(struct gpio_chip *gc, unsignedint offset); void (*free)(struct gpio_chip *gc, unsignedint offset); int (*get_direction)(struct gpio_chip *gc, unsignedint offset); int (*direction_input)(struct gpio_chip *gc, unsignedint offset); int (*direction_output)(struct gpio_chip *gc, unsignedint offset, int value); int (*get)(struct gpio_chip *gc, unsignedint offset); int (*get_multiple)(struct gpio_chip *gc, unsignedlong *mask, unsignedlong *bits); int (*set)(struct gpio_chip *gc, unsignedint offset, int value); int (*set_multiple)(struct gpio_chip *gc, unsignedlong *mask, unsignedlong *bits); int (*set_config)(struct gpio_chip *gc, unsignedint offset, unsignedlong config); int (*to_irq)(struct gpio_chip *gc, unsignedint offset);
#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 */
#ifdefined(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>;
*/ unsignedint 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, unsignedint 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, conststruct of_phandle_args *gpiospec, u32 *flags); #endif/* CONFIG_OF_GPIO */
};
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;
}), constchar **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)
/** * 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) ({ \ staticstruct lock_class_key lock_key; \ staticstruct lock_class_key request_key; \
gpiochip_add_data_with_key(gc, data, &lock_key, \
&request_key); \
}) #define devm_gpiochip_add_data(dev, gc, data) ({ \ staticstruct lock_class_key lock_key; \ staticstruct 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 */
/* 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
staticinlinevoid gpio_irq_chip_set_chip(struct gpio_irq_chip *girq, conststruct 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, unsignedint offset); bool gpiochip_line_is_open_source(struct gpio_chip *gc, unsignedint offset);
int gpiochip_generic_request(struct gpio_chip *gc, unsignedint offset); void gpiochip_generic_free(struct gpio_chip *gc, unsignedint offset); int gpiochip_generic_config(struct gpio_chip *gc, unsignedint offset, unsignedlong 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;
};
staticinlinestruct gpio_chip *gpiod_to_chip(conststruct gpio_desc *desc)
{ /* GPIO can never have been requested */
WARN_ON(1); return ERR_PTR(-ENODEV);
}
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