123 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * GPIO driver for the ACCES PCI-IDIO-164 * Copyright (C) 2017 William Breathitt Gray5 */6#include <linux/bits.h>7#include <linux/device.h>8#include <linux/err.h>9#include <linux/irq.h>10#include <linux/kernel.h>11#include <linux/module.h>12#include <linux/pci.h>13#include <linux/regmap.h>14#include <linux/types.h>15 16#include "gpio-idio-16.h"17 18static const struct regmap_range idio_16_wr_ranges[] = {19 regmap_reg_range(0x0, 0x2), regmap_reg_range(0x3, 0x4),20};21static const struct regmap_range idio_16_rd_ranges[] = {22 regmap_reg_range(0x1, 0x2), regmap_reg_range(0x5, 0x6),23};24static const struct regmap_range idio_16_precious_ranges[] = {25 regmap_reg_range(0x2, 0x2),26};27static const struct regmap_access_table idio_16_wr_table = {28 .yes_ranges = idio_16_wr_ranges,29 .n_yes_ranges = ARRAY_SIZE(idio_16_wr_ranges),30};31static const struct regmap_access_table idio_16_rd_table = {32 .yes_ranges = idio_16_rd_ranges,33 .n_yes_ranges = ARRAY_SIZE(idio_16_rd_ranges),34};35static const struct regmap_access_table idio_16_precious_table = {36 .yes_ranges = idio_16_precious_ranges,37 .n_yes_ranges = ARRAY_SIZE(idio_16_precious_ranges),38};39static const struct regmap_config idio_16_regmap_config = {40 .reg_bits = 8,41 .reg_stride = 1,42 .val_bits = 8,43 .io_port = true,44 .wr_table = &idio_16_wr_table,45 .rd_table = &idio_16_rd_table,46 .volatile_table = &idio_16_rd_table,47 .precious_table = &idio_16_precious_table,48 .cache_type = REGCACHE_FLAT,49 .use_raw_spinlock = true,50};51 52/* Only input lines (GPIO 16-31) support interrupts */53#define IDIO_16_REGMAP_IRQ(_id) \54 [16 + _id] = { \55 .mask = BIT(2), \56 .type = { .types_supported = IRQ_TYPE_EDGE_BOTH }, \57 }58 59static const struct regmap_irq idio_16_regmap_irqs[] = {60 IDIO_16_REGMAP_IRQ(0), IDIO_16_REGMAP_IRQ(1), IDIO_16_REGMAP_IRQ(2), /* 0-2 */61 IDIO_16_REGMAP_IRQ(3), IDIO_16_REGMAP_IRQ(4), IDIO_16_REGMAP_IRQ(5), /* 3-5 */62 IDIO_16_REGMAP_IRQ(6), IDIO_16_REGMAP_IRQ(7), IDIO_16_REGMAP_IRQ(8), /* 6-8 */63 IDIO_16_REGMAP_IRQ(9), IDIO_16_REGMAP_IRQ(10), IDIO_16_REGMAP_IRQ(11), /* 9-11 */64 IDIO_16_REGMAP_IRQ(12), IDIO_16_REGMAP_IRQ(13), IDIO_16_REGMAP_IRQ(14), /* 12-14 */65 IDIO_16_REGMAP_IRQ(15), /* 15 */66};67 68static int idio_16_probe(struct pci_dev *pdev, const struct pci_device_id *id)69{70 struct device *const dev = &pdev->dev;71 int err;72 const size_t pci_bar_index = 2;73 const char *const name = pci_name(pdev);74 struct idio_16_regmap_config config = {};75 void __iomem *regs;76 struct regmap *map;77 78 err = pcim_enable_device(pdev);79 if (err) {80 dev_err(dev, "Failed to enable PCI device (%d)\n", err);81 return err;82 }83 84 err = pcim_iomap_regions(pdev, BIT(pci_bar_index), name);85 if (err) {86 dev_err(dev, "Unable to map PCI I/O addresses (%d)\n", err);87 return err;88 }89 90 regs = pcim_iomap_table(pdev)[pci_bar_index];91 92 map = devm_regmap_init_mmio(dev, regs, &idio_16_regmap_config);93 if (IS_ERR(map))94 return dev_err_probe(dev, PTR_ERR(map), "Unable to initialize register map\n");95 96 config.parent = dev;97 config.map = map;98 config.regmap_irqs = idio_16_regmap_irqs;99 config.num_regmap_irqs = ARRAY_SIZE(idio_16_regmap_irqs);100 config.irq = pdev->irq;101 config.filters = true;102 103 return devm_idio_16_regmap_register(dev, &config);104}105 106static const struct pci_device_id idio_16_pci_dev_id[] = {107 { PCI_DEVICE(0x494F, 0x0DC8) }, { 0 }108};109MODULE_DEVICE_TABLE(pci, idio_16_pci_dev_id);110 111static struct pci_driver idio_16_driver = {112 .name = "pci-idio-16",113 .id_table = idio_16_pci_dev_id,114 .probe = idio_16_probe115};116 117module_pci_driver(idio_16_driver);118 119MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");120MODULE_DESCRIPTION("ACCES PCI-IDIO-16 GPIO driver");121MODULE_LICENSE("GPL v2");122MODULE_IMPORT_NS(GPIO_IDIO_16);123