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Release 4.14 drivers/gpio/gpio-104-idio-16.c

Directory: drivers/gpio
/*
 * 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_hw_array(base, uint, ioport, &num_idio_16, 0);
MODULE_PARM_DESC(base, "ACCES 104-IDIO-16 base addresses");


static unsigned int irq[MAX_NUM_IDIO_16];
module_param_hw_array(irq, uint, irq, 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
 * @out_state:  output bits state
 */

struct idio_16_gpio {
	
struct gpio_chip chip;
	
raw_spinlock_t lock;
	
unsigned long irq_mask;
	
unsigned base;
	
unsigned out_state;
};


static int idio_16_gpio_get_direction(struct gpio_chip *chip, unsigned offset) { if (offset > 15) return 1; return 0; }

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static int idio_16_gpio_direction_input(struct gpio_chip *chip, unsigned offset) { return 0; }

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static int idio_16_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int value) { chip->set(chip, offset, value); return 0; }

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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)); }

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William Breathitt Gray8798.86%266.67%
Linus Walleij11.14%133.33%
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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; raw_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); raw_spin_unlock_irqrestore(&idio16gpio->lock, flags); }

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Total119100.00%4100.00%


static void idio_16_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip); unsigned long flags; raw_spin_lock_irqsave(&idio16gpio->lock, flags); idio16gpio->out_state &= ~*mask; idio16gpio->out_state |= *mask & *bits; if (*mask & 0xFF) outb(idio16gpio->out_state, idio16gpio->base); if ((*mask >> 8) & 0xFF) outb(idio16gpio->out_state >> 8, idio16gpio->base + 4); raw_spin_unlock_irqrestore(&idio16gpio->lock, flags); }

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static void idio_16_irq_ack(struct irq_data *data) { }

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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) { raw_spin_lock_irqsave(&idio16gpio->lock, flags); outb(0, idio16gpio->base + 2); raw_spin_unlock_irqrestore(&idio16gpio->lock, flags); } }

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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) { raw_spin_lock_irqsave(&idio16gpio->lock, flags); inb(idio16gpio->base + 2); raw_spin_unlock_irqrestore(&idio16gpio->lock, flags); } }

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William Breathitt Gray9797.00%133.33%
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Linus Walleij11.00%133.33%
Total100100.00%3100.00%


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; }

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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)); raw_spin_lock(&idio16gpio->lock); outb(0, idio16gpio->base + 1); raw_spin_unlock(&idio16gpio->lock); return IRQ_HANDLED; }

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#define IDIO_16_NGPIO 32 static const char *idio_16_names[IDIO_16_NGPIO] = { "OUT0", "OUT1", "OUT2", "OUT3", "OUT4", "OUT5", "OUT6", "OUT7", "OUT8", "OUT9", "OUT10", "OUT11", "OUT12", "OUT13", "OUT14", "OUT15", "IIN0", "IIN1", "IIN2", "IIN3", "IIN4", "IIN5", "IIN6", "IIN7", "IIN8", "IIN9", "IIN10", "IIN11", "IIN12", "IIN13", "IIN14", "IIN15" };
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 = IDIO_16_NGPIO; idio16gpio->chip.names = idio_16_names; 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->chip.set_multiple = idio_16_gpio_set_multiple; idio16gpio->base = base[id]; idio16gpio->out_state = 0xFFFF; raw_spin_lock_init(&idio16gpio->lock); err = devm_gpiochip_add_data(dev, &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); return err; } err = devm_request_irq(dev, irq[id], idio_16_irq_handler, 0, name, idio16gpio); if (err) { dev_err(dev, "IRQ handler registering failed (%d)\n", err); return err; } return 0; }

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Total355100.00%13100.00%

static struct isa_driver idio_16_driver = { .probe = idio_16_probe, .driver = { .name = "104-idio-16" }, }; 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");

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William Breathitt Gray134498.17%1173.33%
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Linus Walleij70.51%213.33%
David Howells60.44%16.67%
Total1369100.00%15100.00%
Directory: drivers/gpio
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