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