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[ARM] 4947/1: htc-egpio, a driver for GPIO/IRQ expanders with fixed input/output pins

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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>
This commit is contained in:
Philipp Zabel 2008-04-09 19:20:34 +01:00 • committed by Russell King
parent e6816f34e4
commit a1635b8fe5
4 changed files with 507 additions and 0 deletions
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57
include/linux/mfd/htc-egpio.h Normal file
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/*
* 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