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https://github.com/torvalds/linux
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73d8f3efc5
The regmap API supports IO port accessors so we can take advantage of regmap abstractions rather than handling access to the device registers directly in the driver. Migrate the pci-idio-16 module to the new idio-16 library interface leveraging the gpio-regmap API. Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/5ba5405c64aca984d5cf3bdbdffa04c325e5a147.1680618405.git.william.gray@linaro.org/ Signed-off-by: William Breathitt Gray <william.gray@linaro.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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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