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