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, port: 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(ptr: map)) |
105 | return dev_err_probe(dev, err: PTR_ERR(ptr: map), fmt: "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: &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); |
130 | |