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>
57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/*
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* HTC simple EGPIO irq and gpio extender
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*/
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#ifndef __HTC_EGPIO_H__
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#define __HTC_EGPIO_H__
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#include <linux/gpio.h>
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/* Descriptive values for all-in or all-out htc_egpio_chip descriptors. */
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#define HTC_EGPIO_OUTPUT (~0)
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#define HTC_EGPIO_INPUT 0
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/**
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* struct htc_egpio_chip - descriptor to create gpio_chip for register range
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* @reg_start: index of first register
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* @gpio_base: gpio number of first pin in this register range
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* @num_gpios: number of gpios in this register range, max BITS_PER_LONG
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* (number of registers = DIV_ROUND_UP(num_gpios, reg_width))
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* @direction: bitfield, '0' = input, '1' = output,
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*/
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struct htc_egpio_chip {
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int reg_start;
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int gpio_base;
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int num_gpios;
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unsigned long direction;
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unsigned long initial_values;
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};
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/**
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* struct htc_egpio_platform_data - description provided by the arch
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* @irq_base: beginning of available IRQs (eg, IRQ_BOARD_START)
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* @num_irqs: number of irqs
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* @reg_width: number of bits per register, either 8 or 16 bit
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* @bus_width: alignment of the registers, either 16 or 32 bit
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* @invert_acks: set if chip requires writing '0' to ack an irq, instead of '1'
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* @ack_register: location of the irq/ack register
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* @chip: pointer to array of htc_egpio_chip descriptors
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* @num_chips: number of egpio chip descriptors
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*/
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struct htc_egpio_platform_data {
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int bus_width;
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int reg_width;
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int irq_base;
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int num_irqs;
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int invert_acks;
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int ack_register;
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struct htc_egpio_chip *chip;
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int num_chips;
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};
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/* Determine the wakeup irq, to be called during early resume */
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extern int htc_egpio_get_wakeup_irq(struct device *dev);
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#endif
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