mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 13:13:57 +08:00
a1635b8fe5
implemented in CPLD chips on several HTC devices. The original driver was written by Kevin O'Connor, I have adapted it to use gpiolib and made the bus/register widths configurable. Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/*
|
|
* HTC simple EGPIO irq and gpio extender
|
|
*/
|
|
|
|
#ifndef __HTC_EGPIO_H__
|
|
#define __HTC_EGPIO_H__
|
|
|
|
#include <linux/gpio.h>
|
|
|
|
/* Descriptive values for all-in or all-out htc_egpio_chip descriptors. */
|
|
#define HTC_EGPIO_OUTPUT (~0)
|
|
#define HTC_EGPIO_INPUT 0
|
|
|
|
/**
|
|
* struct htc_egpio_chip - descriptor to create gpio_chip for register range
|
|
* @reg_start: index of first register
|
|
* @gpio_base: gpio number of first pin in this register range
|
|
* @num_gpios: number of gpios in this register range, max BITS_PER_LONG
|
|
* (number of registers = DIV_ROUND_UP(num_gpios, reg_width))
|
|
* @direction: bitfield, '0' = input, '1' = output,
|
|
*/
|
|
struct htc_egpio_chip {
|
|
int reg_start;
|
|
int gpio_base;
|
|
int num_gpios;
|
|
unsigned long direction;
|
|
unsigned long initial_values;
|
|
};
|
|
|
|
/**
|
|
* struct htc_egpio_platform_data - description provided by the arch
|
|
* @irq_base: beginning of available IRQs (eg, IRQ_BOARD_START)
|
|
* @num_irqs: number of irqs
|
|
* @reg_width: number of bits per register, either 8 or 16 bit
|
|
* @bus_width: alignment of the registers, either 16 or 32 bit
|
|
* @invert_acks: set if chip requires writing '0' to ack an irq, instead of '1'
|
|
* @ack_register: location of the irq/ack register
|
|
* @chip: pointer to array of htc_egpio_chip descriptors
|
|
* @num_chips: number of egpio chip descriptors
|
|
*/
|
|
struct htc_egpio_platform_data {
|
|
int bus_width;
|
|
int reg_width;
|
|
|
|
int irq_base;
|
|
int num_irqs;
|
|
int invert_acks;
|
|
int ack_register;
|
|
|
|
struct htc_egpio_chip *chip;
|
|
int num_chips;
|
|
};
|
|
|
|
/* Determine the wakeup irq, to be called during early resume */
|
|
extern int htc_egpio_get_wakeup_irq(struct device *dev);
|
|
|
|
#endif
|