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|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* GPIO Testing Device Driver
*
* Copyright (C) 2014 Kamlakant Patel <kamlakant.patel@broadcom.com>
* Copyright (C) 2015-2016 Bamvor Jian Zhang <bamv2005@gmail.com>
* Copyright (C) 2017 Bartosz Golaszewski <brgl@bgdev.pl>
*/
#include <linux/debugfs.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/driver.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irq_sim.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include "gpiolib.h"
#define GPIO_MOCKUP_NAME "gpio-mockup"
#define GPIO_MOCKUP_MAX_GC 10
/*
* We're storing two values per chip: the GPIO base and the number
* of GPIO lines.
*/
#define GPIO_MOCKUP_MAX_RANGES (GPIO_MOCKUP_MAX_GC * 2)
/* Maximum of three properties + the sentinel. */
#define GPIO_MOCKUP_MAX_PROP 4
#define gpio_mockup_err(...) pr_err(GPIO_MOCKUP_NAME ": " __VA_ARGS__)
/*
* struct gpio_pin_status - structure describing a GPIO status
* @dir: Configures direction of gpio as "in" or "out"
* @value: Configures status of the gpio as 0(low) or 1(high)
*/
struct gpio_mockup_line_status {
int dir;
int value;
int pull;
};
struct gpio_mockup_chip {
struct gpio_chip gc;
struct gpio_mockup_line_status *lines;
struct irq_sim irqsim;
struct dentry *dbg_dir;
struct mutex lock;
};
struct gpio_mockup_dbgfs_private {
struct gpio_mockup_chip *chip;
struct gpio_desc *desc;
unsigned int offset;
};
static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_RANGES];
static int gpio_mockup_num_ranges;
module_param_array(gpio_mockup_ranges, int, &gpio_mockup_num_ranges, 0400);
static bool gpio_mockup_named_lines;
module_param_named(gpio_mockup_named_lines,
gpio_mockup_named_lines, bool, 0400);
static struct dentry *gpio_mockup_dbg_dir;
static int gpio_mockup_range_base(unsigned int index)
{
return gpio_mockup_ranges[index * 2];
}
static int gpio_mockup_range_ngpio(unsigned int index)
{
return gpio_mockup_ranges[index * 2 + 1];
}
static int __gpio_mockup_get(struct gpio_mockup_chip *chip,
unsigned int offset)
{
return chip->lines[offset].value;
}
static int gpio_mockup_get(struct gpio_chip *gc, unsigned int offset)
{
struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
int val;
mutex_lock(&chip->lock);
val = __gpio_mockup_get(chip, offset);
mutex_unlock(&chip->lock);
return val;
}
static int gpio_mockup_get_multiple(struct gpio_chip *gc,
unsigned long *mask, unsigned long *bits)
{
struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
unsigned int bit, val;
mutex_lock(&chip->lock);
for_each_set_bit(bit, mask, gc->ngpio) {
val = __gpio_mockup_get(chip, bit);
__assign_bit(bit, bits, val);
}
mutex_unlock(&chip->lock);
return 0;
}
static void __gpio_mockup_set(struct gpio_mockup_chip *chip,
unsigned int offset, int value)
{
chip->lines[offset].value = !!value;
}
static void gpio_mockup_set(struct gpio_chip *gc,
unsigned int offset, int value)
{
struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
mutex_lock(&chip->lock);
__gpio_mockup_set(chip, offset, value);
mutex_unlock(&chip->lock);
}
static void gpio_mockup_set_multiple(struct gpio_chip *gc,
unsigned long *mask, unsigned long *bits)
{
struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
unsigned int bit;
mutex_lock(&chip->lock);
for_each_set_bit(bit, mask, gc->ngpio)
__gpio_mockup_set(chip, bit, test_bit(bit, bits));
mutex_unlock(&chip->lock);
}
static int gpio_mockup_apply_pull(struct gpio_mockup_chip *chip,
unsigned int offset, int value)
{
struct gpio_desc *desc;
struct gpio_chip *gc;
struct irq_sim *sim;
int curr, irq, irq_type;
gc = &chip->gc;
desc = &gc->gpiodev->descs[offset];
sim = &chip->irqsim;
mutex_lock(&chip->lock);
if (test_bit(FLAG_REQUESTED, &desc->flags) &&
!test_bit(FLAG_IS_OUT, &desc->flags)) {
curr = __gpio_mockup_get(chip, offset);
if (curr == value)
goto out;
irq = irq_sim_irqnum(sim, offset);
irq_type = irq_get_trigger_type(irq);
if ((value == 1 && (irq_type & IRQ_TYPE_EDGE_RISING)) ||
(value == 0 && (irq_type & IRQ_TYPE_EDGE_FALLING)))
irq_sim_fire(sim, offset);
}
/* Change the value unless we're actively driving the line. */
if (!test_bit(FLAG_REQUESTED, &desc->flags) ||
!test_bit(FLAG_IS_OUT, &desc->flags))
__gpio_mockup_set(chip, offset, value);
out:
chip->lines[offset].pull = value;
mutex_unlock(&chip->lock);
return 0;
}
static int gpio_mockup_set_config(struct gpio_chip *gc,
unsigned int offset, unsigned long config)
{
struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
switch (pinconf_to_config_param(config)) {
case PIN_CONFIG_BIAS_PULL_UP:
return gpio_mockup_apply_pull(chip, offset, 1);
case PIN_CONFIG_BIAS_PULL_DOWN:
return gpio_mockup_apply_pull(chip, offset, 0);
default:
break;
}
return -ENOTSUPP;
}
static int gpio_mockup_dirout(struct gpio_chip *gc,
unsigned int offset, int value)
{
struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
mutex_lock(&chip->lock);
chip->lines[offset].dir = GPIO_LINE_DIRECTION_OUT;
__gpio_mockup_set(chip, offset, value);
mutex_unlock(&chip->lock);
return 0;
}
static int gpio_mockup_dirin(struct gpio_chip *gc, unsigned int offset)
{
struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
mutex_lock(&chip->lock);
chip->lines[offset].dir = GPIO_LINE_DIRECTION_IN;
mutex_unlock(&chip->lock);
return 0;
}
static int gpio_mockup_get_direction(struct gpio_chip *gc, unsigned int offset)
{
struct gpio_mockup_chip *chip = gpiochip_get_data(gc);
int direction;
mutex_lock(&chip->lock);
direction = chip->lines[offset].dir;
mutex_unlock(&chip->lock);
return direction;
}
static int gpio_mockup_to_irq(
|