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 /* Descriptive values for all-in or all-out htc_egpio_chip descriptors. */ 10 #define HTC_EGPIO_OUTPUT (~0) 11 #define HTC_EGPIO_INPUT 0 12 13 /** 14 * struct htc_egpio_chip - descriptor to create gpio_chip for register range 15 * @reg_start: index of first register 16 * @gpio_base: gpio number of first pin in this register range 17 * @num_gpios: number of gpios in this register range, max BITS_PER_LONG 18 * (number of registers = DIV_ROUND_UP(num_gpios, reg_width)) 19 * @direction: bitfield, '0' = input, '1' = output, 20 */ 21 struct htc_egpio_chip { 22 int reg_start; 23 int gpio_base; 24 int num_gpios; 25 unsigned long direction; 26 unsigned long initial_values; 27 }; 28 29 /** 30 * struct htc_egpio_platform_data - description provided by the arch 31 * @irq_base: beginning of available IRQs (eg, IRQ_BOARD_START) 32 * @num_irqs: number of irqs 33 * @reg_width: number of bits per register, either 8 or 16 bit 34 * @bus_width: alignment of the registers, either 16 or 32 bit 35 * @invert_acks: set if chip requires writing '0' to ack an irq, instead of '1' 36 * @ack_register: location of the irq/ack register 37 * @chip: pointer to array of htc_egpio_chip descriptors 38 * @num_chips: number of egpio chip descriptors 39 */ 40 struct htc_egpio_platform_data { 41 int bus_width; 42 int reg_width; 43 44 int irq_base; 45 int num_irqs; 46 int invert_acks; 47 int ack_register; 48 49 struct htc_egpio_chip *chip; 50 int num_chips; 51 }; 52 53 #endif 54