drivers/gpio/gpio-104-idio-16.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * GPIO driver for the ACCES 104-IDIO-16 family
   4  * Copyright (C) 2015 William Breathitt Gray
   5  *
   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 8
  24 #define MAX_NUM_IDIO_16 max_num_isa_dev(IDIO_16_EXTENT)
  25
  26 static unsigned int base[MAX_NUM_IDIO_16];
  27 static unsigned int num_idio_16;
  28 module_param_hw_array(base, uint, ioport, &num_idio_16, 0);
  29 MODULE_PARM_DESC(base, "ACCES 104-IDIO-16 base addresses");
  30
  31 static unsigned int irq[MAX_NUM_IDIO_16];
  32 static unsigned int num_irq;
  33 module_param_hw_array(irq, uint, irq, &num_irq, 0);
  34 MODULE_PARM_DESC(irq, "ACCES 104-IDIO-16 interrupt line numbers");
  35
  36 static const struct regmap_range idio_16_wr_ranges[] = {
  37         regmap_reg_range(0x0, 0x2), regmap_reg_range(0x4, 0x4),
  38 };
  39 static const struct regmap_range idio_16_rd_ranges[] = {
  40         regmap_reg_range(0x1, 0x2), regmap_reg_range(0x5, 0x5),
  41 };
  42 static const struct regmap_range idio_16_precious_ranges[] = {
  43         regmap_reg_range(0x2, 0x2),
  44 };
  45 static 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 };
  49 static 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 };
  53 static 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 };
  57 static 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
  77 static 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
  86 static 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
 117 static struct isa_driver idio_16_driver = {
 118         .probe = idio_16_probe,
 119         .driver = {
 120                 .name = "104-idio-16"
 121         },
 122 };
 123
 124 module_isa_driver_with_irq(idio_16_driver, num_idio_16, num_irq);
 125
 126 MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
 127 MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver");
 128 MODULE_LICENSE("GPL v2");
 129 MODULE_IMPORT_NS("GPIO_IDIO_16");