diff options
Diffstat (limited to 'drivers/gpio/gpio-pci-idio-16.c')
| -rw-r--r-- | drivers/gpio/gpio-pci-idio-16.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-pci-idio-16.c b/drivers/gpio/gpio-pci-idio-16.c new file mode 100644 index 0000000000..44c0a21b1d --- /dev/null +++ b/drivers/gpio/gpio-pci-idio-16.c @@ -0,0 +1,122 @@ +// 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); |