63cdf42e8c
add the ability for userland to be notified of changes on gpio pins via a select(2)/read(2) interface. Change the interrupt handler from filtered to threaded. Because of the uiomove() calls in the new interface, change locking from standard mutex to sx. Add / restore the at91_gpio_high_z() function. Reviewed by: imp (long ago)
109 lines
4.5 KiB
C
109 lines
4.5 KiB
C
/*-
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* Copyright (C) 2006 M. Warner Losh. All rights reserved.
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* Copyright (C) 2012 Ian Lepore. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _ARM_AT91_GPIO_H
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#define _ARM_AT91_GPIO_H
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#ifndef _KERNEL
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#include <sys/types.h>
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#endif
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#include <sys/ioccom.h>
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/* Userland GPIO API for Atmel AT91 series SOC.
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*
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* Open /dev/pioN (where N is 0 for PIOA, 1 for PIOB, etc), and use ioctl(2)
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* calls to configure the pin(s) as needed.
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*
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* The userland interrupt support allows you to use read(2) and/or select(2) to
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* get notified of interrupts on PIO pins for which you enabled interrupt
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* notifications. Each time an interrupt occurs on a given pin, that pin number
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* is written into a buffer as a uint8_t. Thus, reading from /dev/pioN delivers
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* info on which interrupt(s) have occurred since the last read. You can also
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* use select() to block until an interrupt occurs (you still need to read() to
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* consume the interrupt number bytes from the buffer.)
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*/
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struct at91_gpio_info
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{
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uint32_t output_status; /* Current state of output pins */
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uint32_t input_status; /* 1->out 0->in bitmask */
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uint32_t highz_status; /* 1->highz 0->driven bitmask */
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uint32_t pullup_status; /* 1->floating 0->pullup engaged */
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uint32_t glitch_status; /* 0-> no glitch filter 1->gf */
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uint32_t enabled_status; /* 1->used for pio 0->other */
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uint32_t periph_status; /* 0->A periph 1->B periph */
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uint32_t intr_status; /* 1-> ISR enabled, 0->disabled */
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uint32_t extra_status[8];/* Extra status info, device depend */
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};
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struct at91_gpio_cfg
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{
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uint32_t cfgmask; /* which things change */
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#define AT91_GPIO_CFG_INPUT 0x01 /* configure input/output pins */
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#define AT91_GPIO_CFG_HI_Z 0x02 /* HiZ */
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#define AT91_GPIO_CFG_PULLUP 0x04 /* Enable/disable pullup resistors */
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#define AT91_GPIO_CFG_GLITCH 0x08 /* Glitch filtering */
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#define AT91_GPIO_CFG_GPIO 0x10 /* Use pin for PIO or peripheral */
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#define AT91_GPIO_CFG_PERIPH 0x20 /* Select which peripheral to use */
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#define AT91_GPIO_CFG_INTR 0x40 /* Select pin for interrupts */
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uint32_t iomask; /* Mask of bits to change */
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uint32_t input; /* or output */
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uint32_t hi_z; /* Disable output */
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uint32_t pullup; /* Enable pullup resistor */
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uint32_t glitch; /* Glitch filtering */
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uint32_t gpio; /* Enabled for PIO (1) or periph (0) */
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uint32_t periph; /* Select periph A (0) or periph B (1) */
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uint32_t intr; /* Enable interrupt (1), or not (0) */
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};
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struct at91_gpio_bang
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{
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uint32_t clockpin; /* clock pin MASK */
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uint32_t datapin; /* Data pin MASK */
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uint32_t bits; /* bits to clock out (all 32) */
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};
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struct at91_gpio_bang_many
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{
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uint32_t clockpin; /* clock pin MASK */
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uint32_t datapin; /* Data pin MASK */
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void *bits; /* bits to clock out */
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uint32_t numbits; /* Number of bits to clock out */
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};
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#define AT91_GPIO_SET _IOW('g', 0, uint32_t) /* Turn bits on */
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#define AT91_GPIO_CLR _IOW('g', 1, uint32_t) /* Turn bits off */
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#define AT91_GPIO_READ _IOR('g', 2, uint32_t) /* Read input bit state */
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#define AT91_GPIO_INFO _IOR('g', 3, struct at91_gpio_info) /* State of pio cfg */
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#define AT91_GPIO_CFG _IOW('g', 4, struct at91_gpio_cfg) /* Configure pio */
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#define AT91_GPIO_BANG _IOW('g', 5, struct at91_gpio_bang) /* bit bang 32 bits */
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#define AT91_GPIO_BANG_MANY _IOW('g', 6, struct at91_gpio_bang_many)/* bit bang >32 bits */
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#endif /* _ARM_AT91_GPIO_H */
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