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 /* Determine the wakeup irq, to be called during early resume */
54 extern int htc_egpio_get_wakeup_irq(struct device *dev);
55 
56 #endif
57