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9#include <linux/bitops.h>
10#include <linux/device.h>
11#include <linux/errno.h>
12#include <linux/gpio/driver.h>
13#include <linux/io.h>
14#include <linux/ioport.h>
15#include <linux/interrupt.h>
16#include <linux/irqdesc.h>
17#include <linux/isa.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/moduleparam.h>
21#include <linux/spinlock.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];
32module_param_hw_array(irq, uint, irq, NULL, 0);
33MODULE_PARM_DESC(irq, "ACCES 104-IDIO-16 interrupt line numbers");
34
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39
40
41
42
43struct idio_16_gpio {
44 struct gpio_chip chip;
45 raw_spinlock_t lock;
46 unsigned long irq_mask;
47 unsigned base;
48 unsigned out_state;
49};
50
51static int idio_16_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
52{
53 if (offset > 15)
54 return GPIO_LINE_DIRECTION_IN;
55
56 return GPIO_LINE_DIRECTION_OUT;
57}
58
59static int idio_16_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
60{
61 return 0;
62}
63
64static int idio_16_gpio_direction_output(struct gpio_chip *chip,
65 unsigned offset, int value)
66{
67 chip->set(chip, offset, value);
68 return 0;
69}
70
71static int idio_16_gpio_get(struct gpio_chip *chip, unsigned offset)
72{
73 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
74 const unsigned mask = BIT(offset-16);
75
76 if (offset < 16)
77 return -EINVAL;
78
79 if (offset < 24)
80 return !!(inb(idio16gpio->base + 1) & mask);
81
82 return !!(inb(idio16gpio->base + 5) & (mask>>8));
83}
84
85static int idio_16_gpio_get_multiple(struct gpio_chip *chip,
86 unsigned long *mask, unsigned long *bits)
87{
88 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
89
90 *bits = 0;
91 if (*mask & GENMASK(23, 16))
92 *bits |= (unsigned long)inb(idio16gpio->base + 1) << 16;
93 if (*mask & GENMASK(31, 24))
94 *bits |= (unsigned long)inb(idio16gpio->base + 5) << 24;
95
96 return 0;
97}
98
99static void idio_16_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
100{
101 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
102 const unsigned mask = BIT(offset);
103 unsigned long flags;
104
105 if (offset > 15)
106 return;
107
108 raw_spin_lock_irqsave(&idio16gpio->lock, flags);
109
110 if (value)
111 idio16gpio->out_state |= mask;
112 else
113 idio16gpio->out_state &= ~mask;
114
115 if (offset > 7)
116 outb(idio16gpio->out_state >> 8, idio16gpio->base + 4);
117 else
118 outb(idio16gpio->out_state, idio16gpio->base);
119
120 raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
121}
122
123static void idio_16_gpio_set_multiple(struct gpio_chip *chip,
124 unsigned long *mask, unsigned long *bits)
125{
126 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
127 unsigned long flags;
128
129 raw_spin_lock_irqsave(&idio16gpio->lock, flags);
130
131 idio16gpio->out_state &= ~*mask;
132 idio16gpio->out_state |= *mask & *bits;
133
134 if (*mask & 0xFF)
135 outb(idio16gpio->out_state, idio16gpio->base);
136 if ((*mask >> 8) & 0xFF)
137 outb(idio16gpio->out_state >> 8, idio16gpio->base + 4);
138
139 raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
140}
141
142static void idio_16_irq_ack(struct irq_data *data)
143{
144}
145
146static void idio_16_irq_mask(struct irq_data *data)
147{
148 struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
149 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
150 const unsigned long mask = BIT(irqd_to_hwirq(data));
151 unsigned long flags;
152
153 idio16gpio->irq_mask &= ~mask;
154
155 if (!idio16gpio->irq_mask) {
156 raw_spin_lock_irqsave(&idio16gpio->lock, flags);
157
158 outb(0, idio16gpio->base + 2);
159
160 raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
161 }
162}
163
164static void idio_16_irq_unmask(struct irq_data *data)
165{
166 struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
167 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
168 const unsigned long mask = BIT(irqd_to_hwirq(data));
169 const unsigned long prev_irq_mask = idio16gpio->irq_mask;
170 unsigned long flags;
171
172 idio16gpio->irq_mask |= mask;
173
174 if (!prev_irq_mask) {
175 raw_spin_lock_irqsave(&idio16gpio->lock, flags);
176
177 inb(idio16gpio->base + 2);
178
179 raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
180 }
181}
182
183static int idio_16_irq_set_type(struct irq_data *data, unsigned flow_type)
184{
185
186 if (flow_type != IRQ_TYPE_NONE &&
187 (flow_type & IRQ_TYPE_EDGE_BOTH) != IRQ_TYPE_EDGE_BOTH)
188 return -EINVAL;
189
190 return 0;
191}
192
193static struct irq_chip idio_16_irqchip = {
194 .name = "104-idio-16",
195 .irq_ack = idio_16_irq_ack,
196 .irq_mask = idio_16_irq_mask,
197 .irq_unmask = idio_16_irq_unmask,
198 .irq_set_type = idio_16_irq_set_type
199};
200
201static irqreturn_t idio_16_irq_handler(int irq, void *dev_id)
202{
203 struct idio_16_gpio *const idio16gpio = dev_id;
204 struct gpio_chip *const chip = &idio16gpio->chip;
205 int gpio;
206
207 for_each_set_bit(gpio, &idio16gpio->irq_mask, chip->ngpio)
208 generic_handle_irq(irq_find_mapping(chip->irq.domain, gpio));
209
210 raw_spin_lock(&idio16gpio->lock);
211
212 outb(0, idio16gpio->base + 1);
213
214 raw_spin_unlock(&idio16gpio->lock);
215
216 return IRQ_HANDLED;
217}
218
219#define IDIO_16_NGPIO 32
220static const char *idio_16_names[IDIO_16_NGPIO] = {
221 "OUT0", "OUT1", "OUT2", "OUT3", "OUT4", "OUT5", "OUT6", "OUT7",
222 "OUT8", "OUT9", "OUT10", "OUT11", "OUT12", "OUT13", "OUT14", "OUT15",
223 "IIN0", "IIN1", "IIN2", "IIN3", "IIN4", "IIN5", "IIN6", "IIN7",
224 "IIN8", "IIN9", "IIN10", "IIN11", "IIN12", "IIN13", "IIN14", "IIN15"
225};
226
227static int idio_16_irq_init_hw(struct gpio_chip *gc)
228{
229 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(gc);
230
231
232 outb(0, idio16gpio->base + 2);
233 outb(0, idio16gpio->base + 1);
234
235 return 0;
236}
237
238static int idio_16_probe(struct device *dev, unsigned int id)
239{
240 struct idio_16_gpio *idio16gpio;
241 const char *const name = dev_name(dev);
242 struct gpio_irq_chip *girq;
243 int err;
244
245 idio16gpio = devm_kzalloc(dev, sizeof(*idio16gpio), GFP_KERNEL);
246 if (!idio16gpio)
247 return -ENOMEM;
248
249 if (!devm_request_region(dev, base[id], IDIO_16_EXTENT, name)) {
250 dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
251 base[id], base[id] + IDIO_16_EXTENT);
252 return -EBUSY;
253 }
254
255 idio16gpio->chip.label = name;
256 idio16gpio->chip.parent = dev;
257 idio16gpio->chip.owner = THIS_MODULE;
258 idio16gpio->chip.base = -1;
259 idio16gpio->chip.ngpio = IDIO_16_NGPIO;
260 idio16gpio->chip.names = idio_16_names;
261 idio16gpio->chip.get_direction = idio_16_gpio_get_direction;
262 idio16gpio->chip.direction_input = idio_16_gpio_direction_input;
263 idio16gpio->chip.direction_output = idio_16_gpio_direction_output;
264 idio16gpio->chip.get = idio_16_gpio_get;
265 idio16gpio->chip.get_multiple = idio_16_gpio_get_multiple;
266 idio16gpio->chip.set = idio_16_gpio_set;
267 idio16gpio->chip.set_multiple = idio_16_gpio_set_multiple;
268 idio16gpio->base = base[id];
269 idio16gpio->out_state = 0xFFFF;
270
271 girq = &idio16gpio->chip.irq;
272 girq->chip = &idio_16_irqchip;
273
274 girq->parent_handler = NULL;
275 girq->num_parents = 0;
276 girq->parents = NULL;
277 girq->default_type = IRQ_TYPE_NONE;
278 girq->handler = handle_edge_irq;
279 girq->init_hw = idio_16_irq_init_hw;
280
281 raw_spin_lock_init(&idio16gpio->lock);
282
283 err = devm_gpiochip_add_data(dev, &idio16gpio->chip, idio16gpio);
284 if (err) {
285 dev_err(dev, "GPIO registering failed (%d)\n", err);
286 return err;
287 }
288
289 err = devm_request_irq(dev, irq[id], idio_16_irq_handler, 0, name,
290 idio16gpio);
291 if (err) {
292 dev_err(dev, "IRQ handler registering failed (%d)\n", err);
293 return err;
294 }
295
296 return 0;
297}
298
299static struct isa_driver idio_16_driver = {
300 .probe = idio_16_probe,
301 .driver = {
302 .name = "104-idio-16"
303 },
304};
305
306module_isa_driver(idio_16_driver, num_idio_16);
307
308MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
309MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver");
310MODULE_LICENSE("GPL v2");
311
