mirror of
https://github.com/torvalds/linux
synced 2024-09-06 18:01:05 +00:00
![William Breathitt Gray](/assets/img/avatar_default.png)
Exposes consumer library functions to facilitate communication with devices within the ACCES IDIO-16 family such as the 104-IDIO-16 and the PCI-IDIO-16. A CONFIG_GPIO_IDIO_16 Kconfig option is introduced by this patch. Modules wanting access to these idio-16 library functions should select this Kconfig option and import the GPIO_IDIO_16 symbol namespace. Cc: Andy Shevchenko <andriy.shevchenko@intel.com> Signed-off-by: William Breathitt Gray <william.gray@linaro.org> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
147 lines
4.1 KiB
C
147 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* GPIO library for the ACCES IDIO-16 family
|
|
* Copyright (C) 2022 William Breathitt Gray
|
|
*/
|
|
#include <linux/bitmap.h>
|
|
#include <linux/export.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/types.h>
|
|
|
|
#include "gpio-idio-16.h"
|
|
|
|
#define DEFAULT_SYMBOL_NAMESPACE GPIO_IDIO_16
|
|
|
|
/**
|
|
* idio_16_get - get signal value at signal offset
|
|
* @reg: ACCES IDIO-16 device registers
|
|
* @state: ACCES IDIO-16 device state
|
|
* @offset: offset of signal to get
|
|
*
|
|
* Returns the signal value (0=low, 1=high) for the signal at @offset.
|
|
*/
|
|
int idio_16_get(struct idio_16 __iomem *const reg,
|
|
struct idio_16_state *const state, const unsigned long offset)
|
|
{
|
|
const unsigned long mask = BIT(offset);
|
|
|
|
if (offset < IDIO_16_NOUT)
|
|
return test_bit(offset, state->out_state);
|
|
|
|
if (offset < 24)
|
|
return !!(ioread8(®->in0_7) & (mask >> IDIO_16_NOUT));
|
|
|
|
if (offset < 32)
|
|
return !!(ioread8(®->in8_15) & (mask >> 24));
|
|
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(idio_16_get);
|
|
|
|
/**
|
|
* idio_16_get_multiple - get multiple signal values at multiple signal offsets
|
|
* @reg: ACCES IDIO-16 device registers
|
|
* @state: ACCES IDIO-16 device state
|
|
* @mask: mask of signals to get
|
|
* @bits: bitmap to store signal values
|
|
*
|
|
* Stores in @bits the values (0=low, 1=high) for the signals defined by @mask.
|
|
*/
|
|
void idio_16_get_multiple(struct idio_16 __iomem *const reg,
|
|
struct idio_16_state *const state,
|
|
const unsigned long *const mask,
|
|
unsigned long *const bits)
|
|
{
|
|
unsigned long flags;
|
|
const unsigned long out_mask = GENMASK(IDIO_16_NOUT - 1, 0);
|
|
|
|
spin_lock_irqsave(&state->lock, flags);
|
|
|
|
bitmap_replace(bits, bits, state->out_state, &out_mask, IDIO_16_NOUT);
|
|
if (*mask & GENMASK(23, 16))
|
|
bitmap_set_value8(bits, ioread8(®->in0_7), 16);
|
|
if (*mask & GENMASK(31, 24))
|
|
bitmap_set_value8(bits, ioread8(®->in8_15), 24);
|
|
|
|
spin_unlock_irqrestore(&state->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(idio_16_get_multiple);
|
|
|
|
/**
|
|
* idio_16_set - set signal value at signal offset
|
|
* @reg: ACCES IDIO-16 device registers
|
|
* @state: ACCES IDIO-16 device state
|
|
* @offset: offset of signal to set
|
|
* @value: value of signal to set
|
|
*
|
|
* Assigns output @value for the signal at @offset.
|
|
*/
|
|
void idio_16_set(struct idio_16 __iomem *const reg,
|
|
struct idio_16_state *const state, const unsigned long offset,
|
|
const unsigned long value)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (offset >= IDIO_16_NOUT)
|
|
return;
|
|
|
|
spin_lock_irqsave(&state->lock, flags);
|
|
|
|
__assign_bit(offset, state->out_state, value);
|
|
if (offset < 8)
|
|
iowrite8(bitmap_get_value8(state->out_state, 0), ®->out0_7);
|
|
else
|
|
iowrite8(bitmap_get_value8(state->out_state, 8), ®->out8_15);
|
|
|
|
spin_unlock_irqrestore(&state->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(idio_16_set);
|
|
|
|
/**
|
|
* idio_16_set_multiple - set signal values at multiple signal offsets
|
|
* @reg: ACCES IDIO-16 device registers
|
|
* @state: ACCES IDIO-16 device state
|
|
* @mask: mask of signals to set
|
|
* @bits: bitmap of signal output values
|
|
*
|
|
* Assigns output values defined by @bits for the signals defined by @mask.
|
|
*/
|
|
void idio_16_set_multiple(struct idio_16 __iomem *const reg,
|
|
struct idio_16_state *const state,
|
|
const unsigned long *const mask,
|
|
const unsigned long *const bits)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&state->lock, flags);
|
|
|
|
bitmap_replace(state->out_state, state->out_state, bits, mask,
|
|
IDIO_16_NOUT);
|
|
if (*mask & GENMASK(7, 0))
|
|
iowrite8(bitmap_get_value8(state->out_state, 0), ®->out0_7);
|
|
if (*mask & GENMASK(15, 8))
|
|
iowrite8(bitmap_get_value8(state->out_state, 8), ®->out8_15);
|
|
|
|
spin_unlock_irqrestore(&state->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(idio_16_set_multiple);
|
|
|
|
/**
|
|
* idio_16_state_init - initialize idio_16_state structure
|
|
* @state: ACCES IDIO-16 device state
|
|
*
|
|
* Initializes the ACCES IDIO-16 device @state for use in idio-16 library
|
|
* functions.
|
|
*/
|
|
void idio_16_state_init(struct idio_16_state *const state)
|
|
{
|
|
spin_lock_init(&state->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(idio_16_state_init);
|
|
|
|
MODULE_AUTHOR("William Breathitt Gray");
|
|
MODULE_DESCRIPTION("ACCES IDIO-16 GPIO Library");
|
|
MODULE_LICENSE("GPL");
|