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