130 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * GPIO driver for the ACCES 104-IDIO-16 family4 * Copyright (C) 2015 William Breathitt Gray5 *6 * This driver supports the following ACCES devices: 104-IDIO-16,7 * 104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, and 104-IDO-8.8 */9#include <linux/bits.h>10#include <linux/device.h>11#include <linux/err.h>12#include <linux/ioport.h>13#include <linux/irq.h>14#include <linux/isa.h>15#include <linux/kernel.h>16#include <linux/module.h>17#include <linux/moduleparam.h>18#include <linux/regmap.h>19#include <linux/types.h>20 21#include "gpio-idio-16.h"22 23#define IDIO_16_EXTENT 824#define MAX_NUM_IDIO_16 max_num_isa_dev(IDIO_16_EXTENT)25 26static unsigned int base[MAX_NUM_IDIO_16];27static unsigned int num_idio_16;28module_param_hw_array(base, uint, ioport, &num_idio_16, 0);29MODULE_PARM_DESC(base, "ACCES 104-IDIO-16 base addresses");30 31static unsigned int irq[MAX_NUM_IDIO_16];32static unsigned int num_irq;33module_param_hw_array(irq, uint, irq, &num_irq, 0);34MODULE_PARM_DESC(irq, "ACCES 104-IDIO-16 interrupt line numbers");35 36static const struct regmap_range idio_16_wr_ranges[] = {37 regmap_reg_range(0x0, 0x2), regmap_reg_range(0x4, 0x4),38};39static const struct regmap_range idio_16_rd_ranges[] = {40 regmap_reg_range(0x1, 0x2), regmap_reg_range(0x5, 0x5),41};42static const struct regmap_range idio_16_precious_ranges[] = {43 regmap_reg_range(0x2, 0x2),44};45static const struct regmap_access_table idio_16_wr_table = {46 .yes_ranges = idio_16_wr_ranges,47 .n_yes_ranges = ARRAY_SIZE(idio_16_wr_ranges),48};49static const struct regmap_access_table idio_16_rd_table = {50 .yes_ranges = idio_16_rd_ranges,51 .n_yes_ranges = ARRAY_SIZE(idio_16_rd_ranges),52};53static const struct regmap_access_table idio_16_precious_table = {54 .yes_ranges = idio_16_precious_ranges,55 .n_yes_ranges = ARRAY_SIZE(idio_16_precious_ranges),56};57static const struct regmap_config idio_16_regmap_config = {58 .reg_bits = 8,59 .reg_stride = 1,60 .val_bits = 8,61 .io_port = true,62 .wr_table = &idio_16_wr_table,63 .rd_table = &idio_16_rd_table,64 .volatile_table = &idio_16_rd_table,65 .precious_table = &idio_16_precious_table,66 .cache_type = REGCACHE_FLAT,67 .use_raw_spinlock = true,68};69 70/* Only input lines (GPIO 16-31) support interrupts */71#define IDIO_16_REGMAP_IRQ(_id) \72 [16 + _id] = { \73 .mask = BIT(_id), \74 .type = { .types_supported = IRQ_TYPE_EDGE_BOTH }, \75 }76 77static const struct regmap_irq idio_16_regmap_irqs[] = {78 IDIO_16_REGMAP_IRQ(0), IDIO_16_REGMAP_IRQ(1), IDIO_16_REGMAP_IRQ(2), /* 0-2 */79 IDIO_16_REGMAP_IRQ(3), IDIO_16_REGMAP_IRQ(4), IDIO_16_REGMAP_IRQ(5), /* 3-5 */80 IDIO_16_REGMAP_IRQ(6), IDIO_16_REGMAP_IRQ(7), IDIO_16_REGMAP_IRQ(8), /* 6-8 */81 IDIO_16_REGMAP_IRQ(9), IDIO_16_REGMAP_IRQ(10), IDIO_16_REGMAP_IRQ(11), /* 9-11 */82 IDIO_16_REGMAP_IRQ(12), IDIO_16_REGMAP_IRQ(13), IDIO_16_REGMAP_IRQ(14), /* 12-14 */83 IDIO_16_REGMAP_IRQ(15), /* 15 */84};85 86static int idio_16_probe(struct device *dev, unsigned int id)87{88 const char *const name = dev_name(dev);89 struct idio_16_regmap_config config = {};90 void __iomem *regs;91 struct regmap *map;92 93 if (!devm_request_region(dev, base[id], IDIO_16_EXTENT, name)) {94 dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",95 base[id], base[id] + IDIO_16_EXTENT);96 return -EBUSY;97 }98 99 regs = devm_ioport_map(dev, base[id], IDIO_16_EXTENT);100 if (!regs)101 return -ENOMEM;102 103 map = devm_regmap_init_mmio(dev, regs, &idio_16_regmap_config);104 if (IS_ERR(map))105 return dev_err_probe(dev, PTR_ERR(map), "Unable to initialize register map\n");106 107 config.parent = dev;108 config.map = map;109 config.regmap_irqs = idio_16_regmap_irqs;110 config.num_regmap_irqs = ARRAY_SIZE(idio_16_regmap_irqs);111 config.irq = irq[id];112 config.no_status = true;113 114 return devm_idio_16_regmap_register(dev, &config);115}116 117static struct isa_driver idio_16_driver = {118 .probe = idio_16_probe,119 .driver = {120 .name = "104-idio-16"121 },122};123 124module_isa_driver_with_irq(idio_16_driver, num_idio_16, num_irq);125 126MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");127MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver");128MODULE_LICENSE("GPL v2");129MODULE_IMPORT_NS(GPIO_IDIO_16);130