283 lines
7.2 KiB
C
283 lines
7.2 KiB
C
|
/*
|
||
|
|
* GPIO driver for the ACCES 104-IDIO-16 family
|
||
|
|
* Copyright (C) 2015 William Breathitt Gray
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License, version 2, as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful, but
|
||
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
* General Public License for more details.
|
||
|
|
*
|
||
|
|
* This driver supports the following ACCES devices: 104-IDIO-16,
|
||
|
|
* 104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, and 104-IDO-8.
|
||
|
|
*/
|
||
|
|
#include <linux/bitops.h>
|
||
|
|
#include <linux/device.h>
|
||
|
|
#include <linux/errno.h>
|
||
|
|
#include <linux/gpio/driver.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/ioport.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/irqdesc.h>
|
||
|
|
#include <linux/isa.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/moduleparam.h>
|
||
|
|
#include <linux/spinlock.h>
|
||
|
|
|
||
|
|
#define IDIO_16_EXTENT 8
|
||
|
|
#define MAX_NUM_IDIO_16 max_num_isa_dev(IDIO_16_EXTENT)
|
||
|
|
|
||
|
|
static unsigned int base[MAX_NUM_IDIO_16];
|
||
|
|
static unsigned int num_idio_16;
|
||
|
|
module_param_array(base, uint, &num_idio_16, 0);
|
||
|
|
MODULE_PARM_DESC(base, "ACCES 104-IDIO-16 base addresses");
|
||
|
|
|
||
|
|
static unsigned int irq[MAX_NUM_IDIO_16];
|
||
|
|
module_param_array(irq, uint, NULL, 0);
|
||
|
|
MODULE_PARM_DESC(irq, "ACCES 104-IDIO-16 interrupt line numbers");
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct idio_16_gpio - GPIO device private data structure
|
||
|
|
* @chip: instance of the gpio_chip
|
||
|
|
* @lock: synchronization lock to prevent I/O race conditions
|
||
|
|
* @irq_mask: I/O bits affected by interrupts
|
||
|
|
* @base: base port address of the GPIO device
|
||
|
|
* @irq: Interrupt line number
|
||
|
|
* @out_state: output bits state
|
||
|
|
*/
|
||
|
|
struct idio_16_gpio {
|
||
|
|
struct gpio_chip chip;
|
||
|
|
spinlock_t lock;
|
||
|
|
unsigned long irq_mask;
|
||
|
|
unsigned base;
|
||
|
|
unsigned irq;
|
||
|
|
unsigned out_state;
|
||
|
|
};
|
||
|
|
|
||
|
|
static int idio_16_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
|
||
|
|
{
|
||
|
|
if (offset > 15)
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int idio_16_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int idio_16_gpio_direction_output(struct gpio_chip *chip,
|
||
|
|
unsigned offset, int value)
|
||
|
|
{
|
||
|
|
chip->set(chip, offset, value);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int idio_16_gpio_get(struct gpio_chip *chip, unsigned offset)
|
||
|
|
{
|
||
|
|
struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
|
||
|
|
const unsigned mask = BIT(offset-16);
|
||
|
|
|
||
|
|
if (offset < 16)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (offset < 24)
|
||
|
|
return !!(inb(idio16gpio->base + 1) & mask);
|
||
|
|
|
||
|
|
return !!(inb(idio16gpio->base + 5) & (mask>>8));
|
||
|
|
}
|
||
|
|
|
||
|
|
static void idio_16_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
|
||
|
|
{
|
||
|
|
struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
|
||
|
|
const unsigned mask = BIT(offset);
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
if (offset > 15)
|
||
|
|
return;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&idio16gpio->lock, flags);
|
||
|
|
|
||
|
|
if (value)
|
||
|
|
idio16gpio->out_state |= mask;
|
||
|
|
else
|
||
|
|
idio16gpio->out_state &= ~mask;
|
||
|
|
|
||
|
|
if (offset > 7)
|
||
|
|
outb(idio16gpio->out_state >> 8, idio16gpio->base + 4);
|
||
|
|
else
|
||
|
|
outb(idio16gpio->out_state, idio16gpio->base);
|
||
|
|
|
||
|
|
spin_unlock_irqrestore(&idio16gpio->lock, flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void idio_16_irq_ack(struct irq_data *data)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
static void idio_16_irq_mask(struct irq_data *data)
|
||
|
|
{
|
||
|
|
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
|
||
|
|
struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
|
||
|
|
const unsigned long mask = BIT(irqd_to_hwirq(data));
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
idio16gpio->irq_mask &= ~mask;
|
||
|
|
|
||
|
|
if (!idio16gpio->irq_mask) {
|
||
|
|
spin_lock_irqsave(&idio16gpio->lock, flags);
|
||
|
|
|
||
|
|
outb(0, idio16gpio->base + 2);
|
||
|
|
|
||
|
|
spin_unlock_irqrestore(&idio16gpio->lock, flags);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static void idio_16_irq_unmask(struct irq_data *data)
|
||
|
|
{
|
||
|
|
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
|
||
|
|
struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
|
||
|
|
const unsigned long mask = BIT(irqd_to_hwirq(data));
|
||
|
|
const unsigned long prev_irq_mask = idio16gpio->irq_mask;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
idio16gpio->irq_mask |= mask;
|
||
|
|
|
||
|
|
if (!prev_irq_mask) {
|
||
|
|
spin_lock_irqsave(&idio16gpio->lock, flags);
|
||
|
|
|
||
|
|
inb(idio16gpio->base + 2);
|
||
|
|
|
||
|
|
spin_unlock_irqrestore(&idio16gpio->lock, flags);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
static int idio_16_irq_set_type(struct irq_data *data, unsigned flow_type)
|
||
|
|
{
|
||
|
|
/* The only valid irq types are none and both-edges */
|
||
|
|
if (flow_type != IRQ_TYPE_NONE &&
|
||
|
|
(flow_type & IRQ_TYPE_EDGE_BOTH) != IRQ_TYPE_EDGE_BOTH)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct irq_chip idio_16_irqchip = {
|
||
|
|
.name = "104-idio-16",
|
||
|
|
.irq_ack = idio_16_irq_ack,
|
||
|
|
.irq_mask = idio_16_irq_mask,
|
||
|
|
.irq_unmask = idio_16_irq_unmask,
|
||
|
|
.irq_set_type = idio_16_irq_set_type
|
||
|
|
};
|
||
|
|
|
||
|
|
static irqreturn_t idio_16_irq_handler(int irq, void *dev_id)
|
||
|
|
{
|
||
|
|
struct idio_16_gpio *const idio16gpio = dev_id;
|
||
|
|
struct gpio_chip *const chip = &idio16gpio->chip;
|
||
|
|
int gpio;
|
||
|
|
|
||
|
|
for_each_set_bit(gpio, &idio16gpio->irq_mask, chip->ngpio)
|
||
|
|
generic_handle_irq(irq_find_mapping(chip->irqdomain, gpio));
|
||
|
|
|
||
|
|
spin_lock(&idio16gpio->lock);
|
||
|
|
|
||
|
|
outb(0, idio16gpio->base + 1);
|
||
|
|
|
||
|
|
spin_unlock(&idio16gpio->lock);
|
||
|
|
|
||
|
|
return IRQ_HANDLED;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int idio_16_probe(struct device *dev, unsigned int id)
|
||
|
|
{
|
||
|
|
struct idio_16_gpio *idio16gpio;
|
||
|
|
const char *const name = dev_name(dev);
|
||
|
|
int err;
|
||
|
|
|
||
|
|
idio16gpio = devm_kzalloc(dev, sizeof(*idio16gpio), GFP_KERNEL);
|
||
|
|
if (!idio16gpio)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
if (!devm_request_region(dev, base[id], IDIO_16_EXTENT, name)) {
|
||
|
|
dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
|
||
|
|
base[id], base[id] + IDIO_16_EXTENT);
|
||
|
|
return -EBUSY;
|
||
|
|
}
|
||
|
|
|
||
|
|
idio16gpio->chip.label = name;
|
||
|
|
idio16gpio->chip.parent = dev;
|
||
|
|
idio16gpio->chip.owner = THIS_MODULE;
|
||
|
|
idio16gpio->chip.base = -1;
|
||
|
|
idio16gpio->chip.ngpio = 32;
|
||
|
|
idio16gpio->chip.get_direction = idio_16_gpio_get_direction;
|
||
|
|
idio16gpio->chip.direction_input = idio_16_gpio_direction_input;
|
||
|
|
idio16gpio->chip.direction_output = idio_16_gpio_direction_output;
|
||
|
|
idio16gpio->chip.get = idio_16_gpio_get;
|
||
|
|
idio16gpio->chip.set = idio_16_gpio_set;
|
||
|
|
idio16gpio->base = base[id];
|
||
|
|
idio16gpio->irq = irq[id];
|
||
|
|
idio16gpio->out_state = 0xFFFF;
|
||
|
|
|
||
|
|
spin_lock_init(&idio16gpio->lock);
|
||
|
|
|
||
|
|
dev_set_drvdata(dev, idio16gpio);
|
||
|
|
|
||
|
|
err = gpiochip_add_data(&idio16gpio->chip, idio16gpio);
|
||
|
|
if (err) {
|
||
|
|
dev_err(dev, "GPIO registering failed (%d)\n", err);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Disable IRQ by default */
|
||
|
|
outb(0, base[id] + 2);
|
||
|
|
outb(0, base[id] + 1);
|
||
|
|
|
||
|
|
err = gpiochip_irqchip_add(&idio16gpio->chip, &idio_16_irqchip, 0,
|
||
|
|
handle_edge_irq, IRQ_TYPE_NONE);
|
||
|
|
if (err) {
|
||
|
|
dev_err(dev, "Could not add irqchip (%d)\n", err);
|
||
|
|
goto err_gpiochip_remove;
|
||
|
|
}
|
||
|
|
|
||
|
|
err = request_irq(irq[id], idio_16_irq_handler, 0, name, idio16gpio);
|
||
|
|
if (err) {
|
||
|
|
dev_err(dev, "IRQ handler registering failed (%d)\n", err);
|
||
|
|
goto err_gpiochip_remove;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
err_gpiochip_remove:
|
||
|
|
gpiochip_remove(&idio16gpio->chip);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int idio_16_remove(struct device *dev, unsigned int id)
|
||
|
|
{
|
||
|
|
struct idio_16_gpio *const idio16gpio = dev_get_drvdata(dev);
|
||
|
|
|
||
|
|
free_irq(idio16gpio->irq, idio16gpio);
|
||
|
|
gpiochip_remove(&idio16gpio->chip);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct isa_driver idio_16_driver = {
|
||
|
|
.probe = idio_16_probe,
|
||
|
|
.driver = {
|
||
|
|
.name = "104-idio-16"
|
||
|
|
},
|
||
|
|
.remove = idio_16_remove
|
||
|
|
};
|
||
|
|
|
||
|
|
module_isa_driver(idio_16_driver, num_idio_16);
|
||
|
|
|
||
|
|
MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
|
||
|
|
MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver");
|
||
|
|
MODULE_LICENSE("GPL v2");
|