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// SPDX-License-Identifier: GPL-2.0-only
/*
* GPIO driver for the ACCES PCI-IDIO-16
* Copyright (C) 2017 William Breathitt Gray
*/
#include <linux/bits.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/regmap.h>
#include <linux/types.h>
#include "gpio-idio-16.h"
static const struct regmap_range idio_16_wr_ranges[] = {
regmap_reg_range(0x0, 0x2), regmap_reg_range(0x3, 0x4),
};
static const struct regmap_range idio_16_rd_ranges[] = {
regmap_reg_range(0x1, 0x2), regmap_reg_range(0x5, 0x6),
};
static const struct regmap_range idio_16_precious_ranges[] = {
regmap_reg_range(0x2, 0x2),
};
static const struct regmap_access_table idio_16_wr_table = {
.yes_ranges = idio_16_wr_ranges,
.n_yes_ranges = ARRAY_SIZE(idio_16_wr_ranges),
};
static const struct regmap_access_table idio_16_rd_table = {
.yes_ranges = idio_16_rd_ranges,
.n_yes_ranges = ARRAY_SIZE(idio_16_rd_ranges),
};
static const struct regmap_access_table idio_16_precious_table = {
.yes_ranges = idio_16_precious_ranges,
.n_yes_ranges = ARRAY_SIZE(idio_16_precious_ranges),
};
static const struct regmap_config idio_16_regmap_config = {
.reg_bits = 8,
.reg_stride = 1,
.val_bits = 8,
.io_port = true,
.wr_table = &idio_16_wr_table,
.rd_table = &idio_16_rd_table,
.volatile_table = &idio_16_rd_table,
.precious_table = &idio_16_precious_table,
.cache_type = REGCACHE_FLAT,
.use_raw_spinlock = true,
};
/* Only input lines (GPIO 16-31) support interrupts */
#define IDIO_16_REGMAP_IRQ(_id) \
[16 + _id] = { \
.mask = BIT(2), \
.type = { .types_supported = IRQ_TYPE_EDGE_BOTH }, \
}
static const struct regmap_irq idio_16_regmap_irqs[] = {
IDIO_16_REGMAP_IRQ(0), IDIO_16_REGMAP_IRQ(1), IDIO_16_REGMAP_IRQ(2), /* 0-2 */
IDIO_16_REGMAP_IRQ(3), IDIO_16_REGMAP_IRQ(4), IDIO_16_REGMAP_IRQ(5), /* 3-5 */
IDIO_16_REGMAP_IRQ(6), IDIO_16_REGMAP_IRQ(7), IDIO_16_REGMAP_IRQ(8), /* 6-8 */
IDIO_16_REGMAP_IRQ(9), IDIO_16_REGMAP_IRQ(10), IDIO_16_REGMAP_IRQ(11), /* 9-11 */
IDIO_16_REGMAP_IRQ(12), IDIO_16_REGMAP_IRQ(13), IDIO_16_REGMAP_IRQ(14), /* 12-14 */
IDIO_16_REGMAP_IRQ(15), /* 15 */
};
static int idio_16_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct device *const dev = &pdev->dev;
int err;
const size_t pci_bar_index = 2;
const char *const name = pci_name(pdev);
struct idio_16_regmap_config config = {};
void __iomem *regs;
struct regmap *map;
err = pcim_enable_device(pdev);
if (err) {
dev_err(dev, "Failed to enable PCI device (%d)\n", err);
return err;
}
err = pcim_iomap_regions(pdev, BIT(pci_bar_index), name);
if (err) {
dev_err(dev, "Unable to map PCI I/O addresses (%d)\n", err);
return err;
}
regs = pcim_iomap_table(pdev)[pci_bar_index];
map = devm_regmap_init_mmio(dev, regs, &idio_16_regmap_config);
if (IS_ERR(map))
return dev_err_probe(dev, PTR_ERR(map), "Unable to initialize register map\n");
config.parent = dev;
config.map = map;
config.regmap_irqs = idio_16_regmap_irqs;
config.num_regmap_irqs = ARRAY_SIZE(idio_16_regmap_irqs);
config.irq = pdev->irq;
config.filters = true;
return devm_idio_16_regmap_register(dev, &config);
}
static const struct pci_device_id idio_16_pci_dev_id[] = {
{ PCI_DEVICE(0x494F, 0x0DC8) }, { 0 }
};
MODULE_DEVICE_TABLE(pci, idio_16_pci_dev_id);
static struct pci_driver idio_16_driver = {
.name = "pci-idio-16",
.id_table = idio_16_pci_dev_id,
.probe = idio_16_probe
};
module_pci_driver(idio_16_driver);
MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
MODULE_DESCRIPTION("ACCES PCI-IDIO-16 GPIO driver");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(GPIO_IDIO_16);
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