1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __LINUX_GPIO_DRIVER_H 3 #define __LINUX_GPIO_DRIVER_H 4 5 #include <linux/bits.h> 6 #include <linux/irqchip/chained_irq.h> 7 #include <linux/irqdomain.h> 8 #include <linux/irqhandler.h> 9 #include <linux/lockdep.h> 10 #include <linux/pinctrl/pinconf-generic.h> 11 #include <linux/pinctrl/pinctrl.h> 12 #include <linux/property.h> 13 #include <linux/spinlock_types.h> 14 #include <linux/types.h> 15 16 #ifdef CONFIG_GENERIC_MSI_IRQ 17 #include <asm/msi.h> 18 #endif 19 20 struct device; 21 struct irq_chip; 22 struct irq_data; 23 struct module; 24 struct of_phandle_args; 25 struct pinctrl_dev; 26 struct seq_file; 27 28 struct gpio_chip; 29 struct gpio_desc; 30 struct gpio_device; 31 32 enum gpio_lookup_flags; 33 enum gpiod_flags; 34 35 union gpio_irq_fwspec { 36 struct irq_fwspec fwspec; 37 #ifdef CONFIG_GENERIC_MSI_IRQ 38 msi_alloc_info_t msiinfo; 39 #endif 40 }; 41 42 #define GPIO_LINE_DIRECTION_IN 1 43 #define GPIO_LINE_DIRECTION_OUT 0 44 45 /** 46 * struct gpio_irq_chip - GPIO interrupt controller 47 */ 48 struct gpio_irq_chip { 49 /** 50 * @chip: 51 * 52 * GPIO IRQ chip implementation, provided by GPIO driver. 53 */ 54 struct irq_chip *chip; 55 56 /** 57 * @domain: 58 * 59 * Interrupt translation domain; responsible for mapping between GPIO 60 * hwirq number and Linux IRQ number. 61 */ 62 struct irq_domain *domain; 63 64 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY 65 /** 66 * @fwnode: 67 * 68 * Firmware node corresponding to this gpiochip/irqchip, necessary 69 * for hierarchical irqdomain support. 70 */ 71 struct fwnode_handle *fwnode; 72 73 /** 74 * @parent_domain: 75 * 76 * If non-NULL, will be set as the parent of this GPIO interrupt 77 * controller's IRQ domain to establish a hierarchical interrupt 78 * domain. The presence of this will activate the hierarchical 79 * interrupt support. 80 */ 81 struct irq_domain *parent_domain; 82 83 /** 84 * @child_to_parent_hwirq: 85 * 86 * This callback translates a child hardware IRQ offset to a parent 87 * hardware IRQ offset on a hierarchical interrupt chip. The child 88 * hardware IRQs correspond to the GPIO index 0..ngpio-1 (see the 89 * ngpio field of struct gpio_chip) and the corresponding parent 90 * hardware IRQ and type (such as IRQ_TYPE_*) shall be returned by 91 * the driver. The driver can calculate this from an offset or using 92 * a lookup table or whatever method is best for this chip. Return 93 * 0 on successful translation in the driver. 94 * 95 * If some ranges of hardware IRQs do not have a corresponding parent 96 * HWIRQ, return -EINVAL, but also make sure to fill in @valid_mask and 97 * @need_valid_mask to make these GPIO lines unavailable for 98 * translation. 99 */ 100 int (*child_to_parent_hwirq)(struct gpio_chip *gc, 101 unsigned int child_hwirq, 102 unsigned int child_type, 103 unsigned int *parent_hwirq, 104 unsigned int *parent_type); 105 106 /** 107 * @populate_parent_alloc_arg : 108 * 109 * This optional callback allocates and populates the specific struct 110 * for the parent's IRQ domain. If this is not specified, then 111 * &gpiochip_populate_parent_fwspec_twocell will be used. A four-cell 112 * variant named &gpiochip_populate_parent_fwspec_fourcell is also 113 * available. 114 */ 115 int (*populate_parent_alloc_arg)(struct gpio_chip *gc, 116 union gpio_irq_fwspec *fwspec, 117 unsigned int parent_hwirq, 118 unsigned int parent_type); 119 120 /** 121 * @child_offset_to_irq: 122 * 123 * This optional callback is used to translate the child's GPIO line 124 * offset on the GPIO chip to an IRQ number for the GPIO to_irq() 125 * callback. If this is not specified, then a default callback will be 126 * provided that returns the line offset. 127 */ 128 unsigned int (*child_offset_to_irq)(struct gpio_chip *gc, 129 unsigned int pin); 130 131 /** 132 * @child_irq_domain_ops: 133 * 134 * The IRQ domain operations that will be used for this GPIO IRQ 135 * chip. If no operations are provided, then default callbacks will 136 * be populated to setup the IRQ hierarchy. Some drivers need to 137 * supply their own translate function. 138 */ 139 struct irq_domain_ops child_irq_domain_ops; 140 #endif 141 142 /** 143 * @handler: 144 * 145 * The IRQ handler to use (often a predefined IRQ core function) for 146 * GPIO IRQs, provided by GPIO driver. 147 */ 148 irq_flow_handler_t handler; 149 150 /** 151 * @default_type: 152 * 153 * Default IRQ triggering type applied during GPIO driver 154 * initialization, provided by GPIO driver. 155 */ 156 unsigned int default_type; 157 158 /** 159 * @lock_key: 160 * 161 * Per GPIO IRQ chip lockdep class for IRQ lock. 162 */ 163 struct lock_class_key *lock_key; 164 165 /** 166 * @request_key: 167 * 168 * Per GPIO IRQ chip lockdep class for IRQ request. 169 */ 170 struct lock_class_key *request_key; 171 172 /** 173 * @parent_handler: 174 * 175 * The interrupt handler for the GPIO chip's parent interrupts, may be 176 * NULL if the parent interrupts are nested rather than cascaded. 177 */ 178 irq_flow_handler_t parent_handler; 179 180 union { 181 /** 182 * @parent_handler_data: 183 * 184 * If @per_parent_data is false, @parent_handler_data is a 185 * single pointer used as the data associated with every 186 * parent interrupt. 187 */ 188 void *parent_handler_data; 189 190 /** 191 * @parent_handler_data_array: 192 * 193 * If @per_parent_data is true, @parent_handler_data_array is 194 * an array of @num_parents pointers, and is used to associate 195 * different data for each parent. This cannot be NULL if 196 * @per_parent_data is true. 197 */ 198 void **parent_handler_data_array; 199 }; 200 201 /** 202 * @num_parents: 203 * 204 * The number of interrupt parents of a GPIO chip. 205 */ 206 unsigned int num_parents; 207 208 /** 209 * @parents: 210 * 211 * A list of interrupt parents of a GPIO chip. This is owned by the 212 * driver, so the core will only reference this list, not modify it. 213 */ 214 unsigned int *parents; 215 216 /** 217 * @map: 218 * 219 * A list of interrupt parents for each line of a GPIO chip. 220 */ 221 unsigned int *map; 222 223 /** 224 * @threaded: 225 * 226 * True if set the interrupt handling uses nested threads. 227 */ 228 bool threaded; 229 230 /** 231 * @per_parent_data: 232 * 233 * True if parent_handler_data_array describes a @num_parents 234 * sized array to be used as parent data. 235 */ 236 bool per_parent_data; 237 238 /** 239 * @initialized: 240 * 241 * Flag to track GPIO chip irq member's initialization. 242 * This flag will make sure GPIO chip irq members are not used 243 * before they are initialized. 244 */ 245 bool initialized; 246 247 /** 248 * @domain_is_allocated_externally: 249 * 250 * True it the irq_domain was allocated outside of gpiolib, in which 251 * case gpiolib won't free the irq_domain itself. 252 */ 253 bool domain_is_allocated_externally; 254 255 /** 256 * @init_hw: optional routine to initialize hardware before 257 * an IRQ chip will be added. This is quite useful when 258 * a particular driver wants to clear IRQ related registers 259 * in order to avoid undesired events. 260 */ 261 int (*init_hw)(struct gpio_chip *gc); 262 263 /** 264 * @init_valid_mask: optional routine to initialize @valid_mask, to be 265 * used if not all GPIO lines are valid interrupts. Sometimes some 266 * lines just cannot fire interrupts, and this routine, when defined, 267 * is passed a bitmap in "valid_mask" and it will have ngpios 268 * bits from 0..(ngpios-1) set to "1" as in valid. The callback can 269 * then directly set some bits to "0" if they cannot be used for 270 * interrupts. 271 */ 272 void (*init_valid_mask)(struct gpio_chip *gc, 273 unsigned long *valid_mask, 274 unsigned int ngpios); 275 276 /** 277 * @valid_mask: 278 * 279 * If not %NULL, holds bitmask of GPIOs which are valid to be included 280 * in IRQ domain of the chip. 281 */ 282 unsigned long *valid_mask; 283 284 /** 285 * @first: 286 * 287 * Required for static IRQ allocation. If set, irq_domain_add_simple() 288 * will allocate and map all IRQs during initialization. 289 */ 290 unsigned int first; 291 292 /** 293 * @irq_enable: 294 * 295 * Store old irq_chip irq_enable callback 296 */ 297 void (*irq_enable)(struct irq_data *data); 298 299 /** 300 * @irq_disable: 301 * 302 * Store old irq_chip irq_disable callback 303 */ 304 void (*irq_disable)(struct irq_data *data); 305 /** 306 * @irq_unmask: 307 * 308 * Store old irq_chip irq_unmask callback 309 */ 310 void (*irq_unmask)(struct irq_data *data); 311 312 /** 313 * @irq_mask: 314 * 315 * Store old irq_chip irq_mask callback 316 */ 317 void (*irq_mask)(struct irq_data *data); 318 }; 319 320 /** 321 * struct gpio_chip - abstract a GPIO controller 322 * @label: a functional name for the GPIO device, such as a part 323 * number or the name of the SoC IP-block implementing it. 324 * @gpiodev: the internal state holder, opaque struct 325 * @parent: optional parent device providing the GPIOs 326 * @fwnode: optional fwnode providing this controller's properties 327 * @owner: helps prevent removal of modules exporting active GPIOs 328 * @request: optional hook for chip-specific activation, such as 329 * enabling module power and clock; may sleep 330 * @free: optional hook for chip-specific deactivation, such as 331 * disabling module power and clock; may sleep 332 * @get_direction: returns direction for signal "offset", 0=out, 1=in, 333 * (same as GPIO_LINE_DIRECTION_OUT / GPIO_LINE_DIRECTION_IN), 334 * or negative error. It is recommended to always implement this 335 * function, even on input-only or output-only gpio chips. 336 * @direction_input: configures signal "offset" as input, or returns error 337 * This can be omitted on input-only or output-only gpio chips. 338 * @direction_output: configures signal "offset" as output, or returns error 339 * This can be omitted on input-only or output-only gpio chips. 340 * @get: returns value for signal "offset", 0=low, 1=high, or negative error 341 * @get_multiple: reads values for multiple signals defined by "mask" and 342 * stores them in "bits", returns 0 on success or negative error 343 * @set: assigns output value for signal "offset" 344 * @set_multiple: assigns output values for multiple signals defined by "mask" 345 * @set_config: optional hook for all kinds of settings. Uses the same 346 * packed config format as generic pinconf. 347 * @to_irq: optional hook supporting non-static gpiod_to_irq() mappings; 348 * implementation may not sleep 349 * @dbg_show: optional routine to show contents in debugfs; default code 350 * will be used when this is omitted, but custom code can show extra 351 * state (such as pullup/pulldown configuration). 352 * @init_valid_mask: optional routine to initialize @valid_mask, to be used if 353 * not all GPIOs are valid. 354 * @add_pin_ranges: optional routine to initialize pin ranges, to be used when 355 * requires special mapping of the pins that provides GPIO functionality. 356 * It is called after adding GPIO chip and before adding IRQ chip. 357 * @en_hw_timestamp: Dependent on GPIO chip, an optional routine to 358 * enable hardware timestamp. 359 * @dis_hw_timestamp: Dependent on GPIO chip, an optional routine to 360 * disable hardware timestamp. 361 * @base: identifies the first GPIO number handled by this chip; 362 * or, if negative during registration, requests dynamic ID allocation. 363 * DEPRECATION: providing anything non-negative and nailing the base 364 * offset of GPIO chips is deprecated. Please pass -1 as base to 365 * let gpiolib select the chip base in all possible cases. We want to 366 * get rid of the static GPIO number space in the long run. 367 * @ngpio: the number of GPIOs handled by this controller; the last GPIO 368 * handled is (base + ngpio - 1). 369 * @offset: when multiple gpio chips belong to the same device this 370 * can be used as offset within the device so friendly names can 371 * be properly assigned. 372 * @names: if set, must be an array of strings to use as alternative 373 * names for the GPIOs in this chip. Any entry in the array 374 * may be NULL if there is no alias for the GPIO, however the 375 * array must be @ngpio entries long. A name can include a single printk 376 * format specifier for an unsigned int. It is substituted by the actual 377 * number of the gpio. 378 * @can_sleep: flag must be set iff get()/set() methods sleep, as they 379 * must while accessing GPIO expander chips over I2C or SPI. This 380 * implies that if the chip supports IRQs, these IRQs need to be threaded 381 * as the chip access may sleep when e.g. reading out the IRQ status 382 * registers. 383 * @read_reg: reader function for generic GPIO 384 * @write_reg: writer function for generic GPIO 385 * @be_bits: if the generic GPIO has big endian bit order (bit 31 is representing 386 * line 0, bit 30 is line 1 ... bit 0 is line 31) this is set to true by the 387 * generic GPIO core. It is for internal housekeeping only. 388 * @reg_dat: data (in) register for generic GPIO 389 * @reg_set: output set register (out=high) for generic GPIO 390 * @reg_clr: output clear register (out=low) for generic GPIO 391 * @reg_dir_out: direction out setting register for generic GPIO 392 * @reg_dir_in: direction in setting register for generic GPIO 393 * @bgpio_dir_unreadable: indicates that the direction register(s) cannot 394 * be read and we need to rely on out internal state tracking. 395 * @bgpio_bits: number of register bits used for a generic GPIO i.e. 396 * <register width> * 8 397 * @bgpio_lock: used to lock chip->bgpio_data. Also, this is needed to keep 398 * shadowed and real data registers writes together. 399 * @bgpio_data: shadowed data register for generic GPIO to clear/set bits 400 * safely. 401 * @bgpio_dir: shadowed direction register for generic GPIO to clear/set 402 * direction safely. A "1" in this word means the line is set as 403 * output. 404 * 405 * A gpio_chip can help platforms abstract various sources of GPIOs so 406 * they can all be accessed through a common programming interface. 407 * Example sources would be SOC controllers, FPGAs, multifunction 408 * chips, dedicated GPIO expanders, and so on. 409 * 410 * Each chip controls a number of signals, identified in method calls 411 * by "offset" values in the range 0..(@ngpio - 1). When those signals 412 * are referenced through calls like gpio_get_value(gpio), the offset 413 * is calculated by subtracting @base from the gpio number. 414 */ 415 struct gpio_chip { 416 const char *label; 417 struct gpio_device *gpiodev; 418 struct device *parent; 419 struct fwnode_handle *fwnode; 420 struct module *owner; 421 422 int (*request)(struct gpio_chip *gc, 423 unsigned int offset); 424 void (*free)(struct gpio_chip *gc, 425 unsigned int offset); 426 int (*get_direction)(struct gpio_chip *gc, 427 unsigned int offset); 428 int (*direction_input)(struct gpio_chip *gc, 429 unsigned int offset); 430 int (*direction_output)(struct gpio_chip *gc, 431 unsigned int offset, int value); 432 int (*get)(struct gpio_chip *gc, 433 unsigned int offset); 434 int (*get_multiple)(struct gpio_chip *gc, 435 unsigned long *mask, 436 unsigned long *bits); 437 void (*set)(struct gpio_chip *gc, 438 unsigned int offset, int value); 439 void (*set_multiple)(struct gpio_chip *gc, 440 unsigned long *mask, 441 unsigned long *bits); 442 int (*set_config)(struct gpio_chip *gc, 443 unsigned int offset, 444 unsigned long config); 445 int (*to_irq)(struct gpio_chip *gc, 446 unsigned int offset); 447 448 void (*dbg_show)(struct seq_file *s, 449 struct gpio_chip *gc); 450 451 int (*init_valid_mask)(struct gpio_chip *gc, 452 unsigned long *valid_mask, 453 unsigned int ngpios); 454 455 int (*add_pin_ranges)(struct gpio_chip *gc); 456 457 int (*en_hw_timestamp)(struct gpio_chip *gc, 458 u32 offset, 459 unsigned long flags); 460 int (*dis_hw_timestamp)(struct gpio_chip *gc, 461 u32 offset, 462 unsigned long flags); 463 int base; 464 u16 ngpio; 465 u16 offset; 466 const char *const *names; 467 bool can_sleep; 468 469 #if IS_ENABLED(CONFIG_GPIO_GENERIC) 470 unsigned long (*read_reg)(void __iomem *reg); 471 void (*write_reg)(void __iomem *reg, unsigned long data); 472 bool be_bits; 473 void __iomem *reg_dat; 474 void __iomem *reg_set; 475 void __iomem *reg_clr; 476 void __iomem *reg_dir_out; 477 void __iomem *reg_dir_in; 478 bool bgpio_dir_unreadable; 479 int bgpio_bits; 480 raw_spinlock_t bgpio_lock; 481 unsigned long bgpio_data; 482 unsigned long bgpio_dir; 483 #endif /* CONFIG_GPIO_GENERIC */ 484 485 #ifdef CONFIG_GPIOLIB_IRQCHIP 486 /* 487 * With CONFIG_GPIOLIB_IRQCHIP we get an irqchip inside the gpiolib 488 * to handle IRQs for most practical cases. 489 */ 490 491 /** 492 * @irq: 493 * 494 * Integrates interrupt chip functionality with the GPIO chip. Can be 495 * used to handle IRQs for most practical cases. 496 */ 497 struct gpio_irq_chip irq; 498 #endif /* CONFIG_GPIOLIB_IRQCHIP */ 499 500 /** 501 * @valid_mask: 502 * 503 * If not %NULL, holds bitmask of GPIOs which are valid to be used 504 * from the chip. 505 */ 506 unsigned long *valid_mask; 507 508 #if defined(CONFIG_OF_GPIO) 509 /* 510 * If CONFIG_OF_GPIO is enabled, then all GPIO controllers described in 511 * the device tree automatically may have an OF translation 512 */ 513 514 /** 515 * @of_gpio_n_cells: 516 * 517 * Number of cells used to form the GPIO specifier. 518 */ 519 unsigned int of_gpio_n_cells; 520 521 /** 522 * @of_xlate: 523 * 524 * Callback to translate a device tree GPIO specifier into a chip- 525 * relative GPIO number and flags. 526 */ 527 int (*of_xlate)(struct gpio_chip *gc, 528 const struct of_phandle_args *gpiospec, u32 *flags); 529 #endif /* CONFIG_OF_GPIO */ 530 }; 531 532 extern const char *gpiochip_is_requested(struct gpio_chip *gc, 533 unsigned int offset); 534 535 /** 536 * for_each_requested_gpio_in_range - iterates over requested GPIOs in a given range 537 * @chip: the chip to query 538 * @i: loop variable 539 * @base: first GPIO in the range 540 * @size: amount of GPIOs to check starting from @base 541 * @label: label of current GPIO 542 */ 543 #define for_each_requested_gpio_in_range(chip, i, base, size, label) \ 544 for (i = 0; i < size; i++) \ 545 if ((label = gpiochip_is_requested(chip, base + i)) == NULL) {} else 546 547 /* Iterates over all requested GPIO of the given @chip */ 548 #define for_each_requested_gpio(chip, i, label) \ 549 for_each_requested_gpio_in_range(chip, i, 0, chip->ngpio, label) 550 551 /* add/remove chips */ 552 extern int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data, 553 struct lock_class_key *lock_key, 554 struct lock_class_key *request_key); 555 556 /** 557 * gpiochip_add_data() - register a gpio_chip 558 * @gc: the chip to register, with gc->base initialized 559 * @data: driver-private data associated with this chip 560 * 561 * Context: potentially before irqs will work 562 * 563 * When gpiochip_add_data() is called very early during boot, so that GPIOs 564 * can be freely used, the gc->parent device must be registered before 565 * the gpio framework's arch_initcall(). Otherwise sysfs initialization 566 * for GPIOs will fail rudely. 567 * 568 * gpiochip_add_data() must only be called after gpiolib initialization, 569 * i.e. after core_initcall(). 570 * 571 * If gc->base is negative, this requests dynamic assignment of 572 * a range of valid GPIOs. 573 * 574 * Returns: 575 * A negative errno if the chip can't be registered, such as because the 576 * gc->base is invalid or already associated with a different chip. 577 * Otherwise it returns zero as a success code. 578 */ 579 #ifdef CONFIG_LOCKDEP 580 #define gpiochip_add_data(gc, data) ({ \ 581 static struct lock_class_key lock_key; \ 582 static struct lock_class_key request_key; \ 583 gpiochip_add_data_with_key(gc, data, &lock_key, \ 584 &request_key); \ 585 }) 586 #define devm_gpiochip_add_data(dev, gc, data) ({ \ 587 static struct lock_class_key lock_key; \ 588 static struct lock_class_key request_key; \ 589 devm_gpiochip_add_data_with_key(dev, gc, data, &lock_key, \ 590 &request_key); \ 591 }) 592 #else 593 #define gpiochip_add_data(gc, data) gpiochip_add_data_with_key(gc, data, NULL, NULL) 594 #define devm_gpiochip_add_data(dev, gc, data) \ 595 devm_gpiochip_add_data_with_key(dev, gc, data, NULL, NULL) 596 #endif /* CONFIG_LOCKDEP */ 597 598 static inline int gpiochip_add(struct gpio_chip *gc) 599 { 600 return gpiochip_add_data(gc, NULL); 601 } 602 extern void gpiochip_remove(struct gpio_chip *gc); 603 extern int devm_gpiochip_add_data_with_key(struct device *dev, struct gpio_chip *gc, void *data, 604 struct lock_class_key *lock_key, 605 struct lock_class_key *request_key); 606 607 extern struct gpio_chip *gpiochip_find(void *data, 608 int (*match)(struct gpio_chip *gc, void *data)); 609 610 struct gpio_device *gpio_device_find(void *data, 611 int (*match)(struct gpio_chip *gc, void *data)); 612 613 struct gpio_device *gpio_device_get(struct gpio_device *gdev); 614 void gpio_device_put(struct gpio_device *gdev); 615 616 bool gpiochip_line_is_irq(struct gpio_chip *gc, unsigned int offset); 617 int gpiochip_reqres_irq(struct gpio_chip *gc, unsigned int offset); 618 void gpiochip_relres_irq(struct gpio_chip *gc, unsigned int offset); 619 void gpiochip_disable_irq(struct gpio_chip *gc, unsigned int offset); 620 void gpiochip_enable_irq(struct gpio_chip *gc, unsigned int offset); 621 622 /* irq_data versions of the above */ 623 int gpiochip_irq_reqres(struct irq_data *data); 624 void gpiochip_irq_relres(struct irq_data *data); 625 626 /* Paste this in your irq_chip structure */ 627 #define GPIOCHIP_IRQ_RESOURCE_HELPERS \ 628 .irq_request_resources = gpiochip_irq_reqres, \ 629 .irq_release_resources = gpiochip_irq_relres 630 631 static inline void gpio_irq_chip_set_chip(struct gpio_irq_chip *girq, 632 const struct irq_chip *chip) 633 { 634 /* Yes, dropping const is ugly, but it isn't like we have a choice */ 635 girq->chip = (struct irq_chip *)chip; 636 } 637 638 /* Line status inquiry for drivers */ 639 bool gpiochip_line_is_open_drain(struct gpio_chip *gc, unsigned int offset); 640 bool gpiochip_line_is_open_source(struct gpio_chip *gc, unsigned int offset); 641 642 /* Sleep persistence inquiry for drivers */ 643 bool gpiochip_line_is_persistent(struct gpio_chip *gc, unsigned int offset); 644 bool gpiochip_line_is_valid(const struct gpio_chip *gc, unsigned int offset); 645 646 /* get driver data */ 647 void *gpiochip_get_data(struct gpio_chip *gc); 648 649 struct bgpio_pdata { 650 const char *label; 651 int base; 652 int ngpio; 653 }; 654 655 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY 656 657 int gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *gc, 658 union gpio_irq_fwspec *gfwspec, 659 unsigned int parent_hwirq, 660 unsigned int parent_type); 661 int gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *gc, 662 union gpio_irq_fwspec *gfwspec, 663 unsigned int parent_hwirq, 664 unsigned int parent_type); 665 666 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */ 667 668 int bgpio_init(struct gpio_chip *gc, struct device *dev, 669 unsigned long sz, void __iomem *dat, void __iomem *set, 670 void __iomem *clr, void __iomem *dirout, void __iomem *dirin, 671 unsigned long flags); 672 673 #define BGPIOF_BIG_ENDIAN BIT(0) 674 #define BGPIOF_UNREADABLE_REG_SET BIT(1) /* reg_set is unreadable */ 675 #define BGPIOF_UNREADABLE_REG_DIR BIT(2) /* reg_dir is unreadable */ 676 #define BGPIOF_BIG_ENDIAN_BYTE_ORDER BIT(3) 677 #define BGPIOF_READ_OUTPUT_REG_SET BIT(4) /* reg_set stores output value */ 678 #define BGPIOF_NO_OUTPUT BIT(5) /* only input */ 679 #define BGPIOF_NO_SET_ON_INPUT BIT(6) 680 681 int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, 682 irq_hw_number_t hwirq); 683 void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq); 684 685 int gpiochip_irq_domain_activate(struct irq_domain *domain, 686 struct irq_data *data, bool reserve); 687 void gpiochip_irq_domain_deactivate(struct irq_domain *domain, 688 struct irq_data *data); 689 690 bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gc, 691 unsigned int offset); 692 693 #ifdef CONFIG_GPIOLIB_IRQCHIP 694 int gpiochip_irqchip_add_domain(struct gpio_chip *gc, 695 struct irq_domain *domain); 696 #else 697 698 #include <asm/bug.h> 699 #include <asm/errno.h> 700 701 static inline int gpiochip_irqchip_add_domain(struct gpio_chip *gc, 702 struct irq_domain *domain) 703 { 704 WARN_ON(1); 705 return -EINVAL; 706 } 707 #endif 708 709 int gpiochip_generic_request(struct gpio_chip *gc, unsigned int offset); 710 void gpiochip_generic_free(struct gpio_chip *gc, unsigned int offset); 711 int gpiochip_generic_config(struct gpio_chip *gc, unsigned int offset, 712 unsigned long config); 713 714 /** 715 * struct gpio_pin_range - pin range controlled by a gpio chip 716 * @node: list for maintaining set of pin ranges, used internally 717 * @pctldev: pinctrl device which handles corresponding pins 718 * @range: actual range of pins controlled by a gpio controller 719 */ 720 struct gpio_pin_range { 721 struct list_head node; 722 struct pinctrl_dev *pctldev; 723 struct pinctrl_gpio_range range; 724 }; 725 726 #ifdef CONFIG_PINCTRL 727 728 int gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name, 729 unsigned int gpio_offset, unsigned int pin_offset, 730 unsigned int npins); 731 int gpiochip_add_pingroup_range(struct gpio_chip *gc, 732 struct pinctrl_dev *pctldev, 733 unsigned int gpio_offset, const char *pin_group); 734 void gpiochip_remove_pin_ranges(struct gpio_chip *gc); 735 736 #else /* ! CONFIG_PINCTRL */ 737 738 static inline int 739 gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name, 740 unsigned int gpio_offset, unsigned int pin_offset, 741 unsigned int npins) 742 { 743 return 0; 744 } 745 static inline int 746 gpiochip_add_pingroup_range(struct gpio_chip *gc, 747 struct pinctrl_dev *pctldev, 748 unsigned int gpio_offset, const char *pin_group) 749 { 750 return 0; 751 } 752 753 static inline void 754 gpiochip_remove_pin_ranges(struct gpio_chip *gc) 755 { 756 } 757 758 #endif /* CONFIG_PINCTRL */ 759 760 struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc, 761 unsigned int hwnum, 762 const char *label, 763 enum gpio_lookup_flags lflags, 764 enum gpiod_flags dflags); 765 void gpiochip_free_own_desc(struct gpio_desc *desc); 766 767 #ifdef CONFIG_GPIOLIB 768 769 /* lock/unlock as IRQ */ 770 int gpiochip_lock_as_irq(struct gpio_chip *gc, unsigned int offset); 771 void gpiochip_unlock_as_irq(struct gpio_chip *gc, unsigned int offset); 772 773 774 struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc); 775 776 #else /* CONFIG_GPIOLIB */ 777 778 #include <linux/err.h> 779 780 #include <asm/bug.h> 781 782 static inline struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) 783 { 784 /* GPIO can never have been requested */ 785 WARN_ON(1); 786 return ERR_PTR(-ENODEV); 787 } 788 789 static inline int gpiochip_lock_as_irq(struct gpio_chip *gc, 790 unsigned int offset) 791 { 792 WARN_ON(1); 793 return -EINVAL; 794 } 795 796 static inline void gpiochip_unlock_as_irq(struct gpio_chip *gc, 797 unsigned int offset) 798 { 799 WARN_ON(1); 800 } 801 #endif /* CONFIG_GPIOLIB */ 802 803 #define for_each_gpiochip_node(dev, child) \ 804 device_for_each_child_node(dev, child) \ 805 if (!fwnode_property_present(child, "gpio-controller")) {} else 806 807 static inline unsigned int gpiochip_node_count(struct device *dev) 808 { 809 struct fwnode_handle *child; 810 unsigned int count = 0; 811 812 for_each_gpiochip_node(dev, child) 813 count++; 814 815 return count; 816 } 817 818 static inline struct fwnode_handle *gpiochip_node_get_first(struct device *dev) 819 { 820 struct fwnode_handle *fwnode; 821 822 for_each_gpiochip_node(dev, fwnode) 823 return fwnode; 824 825 return NULL; 826 } 827 828 #endif /* __LINUX_GPIO_DRIVER_H */ 829