1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * HTC simple EGPIO irq and gpio extender 4 */ 5 6 #ifndef __HTC_EGPIO_H__ 7 #define __HTC_EGPIO_H__ 8 9 #include <linux/gpio.h> 10 11 /* Descriptive values for all-in or all-out htc_egpio_chip descriptors. */ 12 #define HTC_EGPIO_OUTPUT (~0) 13 #define HTC_EGPIO_INPUT 0 14 15 /** 16 * struct htc_egpio_chip - descriptor to create gpio_chip for register range 17 * @reg_start: index of first register 18 * @gpio_base: gpio number of first pin in this register range 19 * @num_gpios: number of gpios in this register range, max BITS_PER_LONG 20 * (number of registers = DIV_ROUND_UP(num_gpios, reg_width)) 21 * @direction: bitfield, '0' = input, '1' = output, 22 */ 23 struct htc_egpio_chip { 24 int reg_start; 25 int gpio_base; 26 int num_gpios; 27 unsigned long direction; 28 unsigned long initial_values; 29 }; 30 31 /** 32 * struct htc_egpio_platform_data - description provided by the arch 33 * @irq_base: beginning of available IRQs (eg, IRQ_BOARD_START) 34 * @num_irqs: number of irqs 35 * @reg_width: number of bits per register, either 8 or 16 bit 36 * @bus_width: alignment of the registers, either 16 or 32 bit 37 * @invert_acks: set if chip requires writing '0' to ack an irq, instead of '1' 38 * @ack_register: location of the irq/ack register 39 * @chip: pointer to array of htc_egpio_chip descriptors 40 * @num_chips: number of egpio chip descriptors 41 */ 42 struct htc_egpio_platform_data { 43 int bus_width; 44 int reg_width; 45 46 int irq_base; 47 int num_irqs; 48 int invert_acks; 49 int ack_register; 50 51 struct htc_egpio_chip *chip; 52 int num_chips; 53 }; 54 55 /* Determine the wakeup irq, to be called during early resume */ 56 extern int htc_egpio_get_wakeup_irq(struct device *dev); 57 58 #endif 59