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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
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");
1/*
2 * GPIO driver for the ACCES 104-IDIO-16 family
3 * Copyright (C) 2015 William Breathitt Gray
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * This driver supports the following ACCES devices: 104-IDIO-16,
15 * 104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, and 104-IDO-8.
16 */
17#include <linux/bitops.h>
18#include <linux/device.h>
19#include <linux/errno.h>
20#include <linux/gpio/driver.h>
21#include <linux/io.h>
22#include <linux/ioport.h>
23#include <linux/interrupt.h>
24#include <linux/irqdesc.h>
25#include <linux/isa.h>
26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/moduleparam.h>
29#include <linux/spinlock.h>
30
31#define IDIO_16_EXTENT 8
32#define MAX_NUM_IDIO_16 max_num_isa_dev(IDIO_16_EXTENT)
33
34static unsigned int base[MAX_NUM_IDIO_16];
35static unsigned int num_idio_16;
36module_param_array(base, uint, &num_idio_16, 0);
37MODULE_PARM_DESC(base, "ACCES 104-IDIO-16 base addresses");
38
39static unsigned int irq[MAX_NUM_IDIO_16];
40module_param_array(irq, uint, NULL, 0);
41MODULE_PARM_DESC(irq, "ACCES 104-IDIO-16 interrupt line numbers");
42
43/**
44 * struct idio_16_gpio - GPIO device private data structure
45 * @chip: instance of the gpio_chip
46 * @lock: synchronization lock to prevent I/O race conditions
47 * @irq_mask: I/O bits affected by interrupts
48 * @base: base port address of the GPIO device
49 * @irq: Interrupt line number
50 * @out_state: output bits state
51 */
52struct idio_16_gpio {
53 struct gpio_chip chip;
54 spinlock_t lock;
55 unsigned long irq_mask;
56 unsigned base;
57 unsigned irq;
58 unsigned out_state;
59};
60
61static int idio_16_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
62{
63 if (offset > 15)
64 return 1;
65
66 return 0;
67}
68
69static int idio_16_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
70{
71 return 0;
72}
73
74static int idio_16_gpio_direction_output(struct gpio_chip *chip,
75 unsigned offset, int value)
76{
77 chip->set(chip, offset, value);
78 return 0;
79}
80
81static int idio_16_gpio_get(struct gpio_chip *chip, unsigned offset)
82{
83 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
84 const unsigned mask = BIT(offset-16);
85
86 if (offset < 16)
87 return -EINVAL;
88
89 if (offset < 24)
90 return !!(inb(idio16gpio->base + 1) & mask);
91
92 return !!(inb(idio16gpio->base + 5) & (mask>>8));
93}
94
95static void idio_16_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
96{
97 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
98 const unsigned mask = BIT(offset);
99 unsigned long flags;
100
101 if (offset > 15)
102 return;
103
104 spin_lock_irqsave(&idio16gpio->lock, flags);
105
106 if (value)
107 idio16gpio->out_state |= mask;
108 else
109 idio16gpio->out_state &= ~mask;
110
111 if (offset > 7)
112 outb(idio16gpio->out_state >> 8, idio16gpio->base + 4);
113 else
114 outb(idio16gpio->out_state, idio16gpio->base);
115
116 spin_unlock_irqrestore(&idio16gpio->lock, flags);
117}
118
119static void idio_16_irq_ack(struct irq_data *data)
120{
121}
122
123static void idio_16_irq_mask(struct irq_data *data)
124{
125 struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
126 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
127 const unsigned long mask = BIT(irqd_to_hwirq(data));
128 unsigned long flags;
129
130 idio16gpio->irq_mask &= ~mask;
131
132 if (!idio16gpio->irq_mask) {
133 spin_lock_irqsave(&idio16gpio->lock, flags);
134
135 outb(0, idio16gpio->base + 2);
136
137 spin_unlock_irqrestore(&idio16gpio->lock, flags);
138 }
139}
140
141static void idio_16_irq_unmask(struct irq_data *data)
142{
143 struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
144 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
145 const unsigned long mask = BIT(irqd_to_hwirq(data));
146 const unsigned long prev_irq_mask = idio16gpio->irq_mask;
147 unsigned long flags;
148
149 idio16gpio->irq_mask |= mask;
150
151 if (!prev_irq_mask) {
152 spin_lock_irqsave(&idio16gpio->lock, flags);
153
154 inb(idio16gpio->base + 2);
155
156 spin_unlock_irqrestore(&idio16gpio->lock, flags);
157 }
158}
159
160static int idio_16_irq_set_type(struct irq_data *data, unsigned flow_type)
161{
162 /* The only valid irq types are none and both-edges */
163 if (flow_type != IRQ_TYPE_NONE &&
164 (flow_type & IRQ_TYPE_EDGE_BOTH) != IRQ_TYPE_EDGE_BOTH)
165 return -EINVAL;
166
167 return 0;
168}
169
170static struct irq_chip idio_16_irqchip = {
171 .name = "104-idio-16",
172 .irq_ack = idio_16_irq_ack,
173 .irq_mask = idio_16_irq_mask,
174 .irq_unmask = idio_16_irq_unmask,
175 .irq_set_type = idio_16_irq_set_type
176};
177
178static irqreturn_t idio_16_irq_handler(int irq, void *dev_id)
179{
180 struct idio_16_gpio *const idio16gpio = dev_id;
181 struct gpio_chip *const chip = &idio16gpio->chip;
182 int gpio;
183
184 for_each_set_bit(gpio, &idio16gpio->irq_mask, chip->ngpio)
185 generic_handle_irq(irq_find_mapping(chip->irqdomain, gpio));
186
187 spin_lock(&idio16gpio->lock);
188
189 outb(0, idio16gpio->base + 1);
190
191 spin_unlock(&idio16gpio->lock);
192
193 return IRQ_HANDLED;
194}
195
196static int idio_16_probe(struct device *dev, unsigned int id)
197{
198 struct idio_16_gpio *idio16gpio;
199 const char *const name = dev_name(dev);
200 int err;
201
202 idio16gpio = devm_kzalloc(dev, sizeof(*idio16gpio), GFP_KERNEL);
203 if (!idio16gpio)
204 return -ENOMEM;
205
206 if (!devm_request_region(dev, base[id], IDIO_16_EXTENT, name)) {
207 dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
208 base[id], base[id] + IDIO_16_EXTENT);
209 return -EBUSY;
210 }
211
212 idio16gpio->chip.label = name;
213 idio16gpio->chip.parent = dev;
214 idio16gpio->chip.owner = THIS_MODULE;
215 idio16gpio->chip.base = -1;
216 idio16gpio->chip.ngpio = 32;
217 idio16gpio->chip.get_direction = idio_16_gpio_get_direction;
218 idio16gpio->chip.direction_input = idio_16_gpio_direction_input;
219 idio16gpio->chip.direction_output = idio_16_gpio_direction_output;
220 idio16gpio->chip.get = idio_16_gpio_get;
221 idio16gpio->chip.set = idio_16_gpio_set;
222 idio16gpio->base = base[id];
223 idio16gpio->irq = irq[id];
224 idio16gpio->out_state = 0xFFFF;
225
226 spin_lock_init(&idio16gpio->lock);
227
228 dev_set_drvdata(dev, idio16gpio);
229
230 err = gpiochip_add_data(&idio16gpio->chip, idio16gpio);
231 if (err) {
232 dev_err(dev, "GPIO registering failed (%d)\n", err);
233 return err;
234 }
235
236 /* Disable IRQ by default */
237 outb(0, base[id] + 2);
238 outb(0, base[id] + 1);
239
240 err = gpiochip_irqchip_add(&idio16gpio->chip, &idio_16_irqchip, 0,
241 handle_edge_irq, IRQ_TYPE_NONE);
242 if (err) {
243 dev_err(dev, "Could not add irqchip (%d)\n", err);
244 goto err_gpiochip_remove;
245 }
246
247 err = request_irq(irq[id], idio_16_irq_handler, 0, name, idio16gpio);
248 if (err) {
249 dev_err(dev, "IRQ handler registering failed (%d)\n", err);
250 goto err_gpiochip_remove;
251 }
252
253 return 0;
254
255err_gpiochip_remove:
256 gpiochip_remove(&idio16gpio->chip);
257 return err;
258}
259
260static int idio_16_remove(struct device *dev, unsigned int id)
261{
262 struct idio_16_gpio *const idio16gpio = dev_get_drvdata(dev);
263
264 free_irq(idio16gpio->irq, idio16gpio);
265 gpiochip_remove(&idio16gpio->chip);
266
267 return 0;
268}
269
270static struct isa_driver idio_16_driver = {
271 .probe = idio_16_probe,
272 .driver = {
273 .name = "104-idio-16"
274 },
275 .remove = idio_16_remove
276};
277
278module_isa_driver(idio_16_driver, num_idio_16);
279
280MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
281MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver");
282MODULE_LICENSE("GPL v2");