Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / gpio / gpio-104-idio-16.c
blob50ad0280fd783ea6059bbf5df3c0d1426f9f23ed
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
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/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>
23 #define IDIO_16_EXTENT 8
24 #define MAX_NUM_IDIO_16 max_num_isa_dev(IDIO_16_EXTENT)
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");
31 static unsigned int irq[MAX_NUM_IDIO_16];
32 module_param_hw_array(irq, uint, irq, NULL, 0);
33 MODULE_PARM_DESC(irq, "ACCES 104-IDIO-16 interrupt line numbers");
35 /**
36 * struct idio_16_gpio - GPIO device private data structure
37 * @chip: instance of the gpio_chip
38 * @lock: synchronization lock to prevent I/O race conditions
39 * @irq_mask: I/O bits affected by interrupts
40 * @base: base port address of the GPIO device
41 * @out_state: output bits state
43 struct 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;
51 static int idio_16_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
53 if (offset > 15)
54 return GPIO_LINE_DIRECTION_IN;
56 return GPIO_LINE_DIRECTION_OUT;
59 static int idio_16_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
61 return 0;
64 static int idio_16_gpio_direction_output(struct gpio_chip *chip,
65 unsigned offset, int value)
67 chip->set(chip, offset, value);
68 return 0;
71 static int idio_16_gpio_get(struct gpio_chip *chip, unsigned offset)
73 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
74 const unsigned mask = BIT(offset-16);
76 if (offset < 16)
77 return -EINVAL;
79 if (offset < 24)
80 return !!(inb(idio16gpio->base + 1) & mask);
82 return !!(inb(idio16gpio->base + 5) & (mask>>8));
85 static int idio_16_gpio_get_multiple(struct gpio_chip *chip,
86 unsigned long *mask, unsigned long *bits)
88 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
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;
96 return 0;
99 static void idio_16_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
101 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
102 const unsigned mask = BIT(offset);
103 unsigned long flags;
105 if (offset > 15)
106 return;
108 raw_spin_lock_irqsave(&idio16gpio->lock, flags);
110 if (value)
111 idio16gpio->out_state |= mask;
112 else
113 idio16gpio->out_state &= ~mask;
115 if (offset > 7)
116 outb(idio16gpio->out_state >> 8, idio16gpio->base + 4);
117 else
118 outb(idio16gpio->out_state, idio16gpio->base);
120 raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
123 static void idio_16_gpio_set_multiple(struct gpio_chip *chip,
124 unsigned long *mask, unsigned long *bits)
126 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
127 unsigned long flags;
129 raw_spin_lock_irqsave(&idio16gpio->lock, flags);
131 idio16gpio->out_state &= ~*mask;
132 idio16gpio->out_state |= *mask & *bits;
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);
139 raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
142 static void idio_16_irq_ack(struct irq_data *data)
146 static void idio_16_irq_mask(struct irq_data *data)
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;
153 idio16gpio->irq_mask &= ~mask;
155 if (!idio16gpio->irq_mask) {
156 raw_spin_lock_irqsave(&idio16gpio->lock, flags);
158 outb(0, idio16gpio->base + 2);
160 raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
164 static void idio_16_irq_unmask(struct irq_data *data)
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;
172 idio16gpio->irq_mask |= mask;
174 if (!prev_irq_mask) {
175 raw_spin_lock_irqsave(&idio16gpio->lock, flags);
177 inb(idio16gpio->base + 2);
179 raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
183 static int idio_16_irq_set_type(struct irq_data *data, unsigned flow_type)
185 /* The only valid irq types are none and both-edges */
186 if (flow_type != IRQ_TYPE_NONE &&
187 (flow_type & IRQ_TYPE_EDGE_BOTH) != IRQ_TYPE_EDGE_BOTH)
188 return -EINVAL;
190 return 0;
193 static 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
201 static irqreturn_t idio_16_irq_handler(int irq, void *dev_id)
203 struct idio_16_gpio *const idio16gpio = dev_id;
204 struct gpio_chip *const chip = &idio16gpio->chip;
205 int gpio;
207 for_each_set_bit(gpio, &idio16gpio->irq_mask, chip->ngpio)
208 generic_handle_irq(irq_find_mapping(chip->irq.domain, gpio));
210 raw_spin_lock(&idio16gpio->lock);
212 outb(0, idio16gpio->base + 1);
214 raw_spin_unlock(&idio16gpio->lock);
216 return IRQ_HANDLED;
219 #define IDIO_16_NGPIO 32
220 static 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"
227 static int idio_16_irq_init_hw(struct gpio_chip *gc)
229 struct idio_16_gpio *const idio16gpio = gpiochip_get_data(gc);
231 /* Disable IRQ by default */
232 outb(0, idio16gpio->base + 2);
233 outb(0, idio16gpio->base + 1);
235 return 0;
238 static int idio_16_probe(struct device *dev, unsigned int id)
240 struct idio_16_gpio *idio16gpio;
241 const char *const name = dev_name(dev);
242 struct gpio_irq_chip *girq;
243 int err;
245 idio16gpio = devm_kzalloc(dev, sizeof(*idio16gpio), GFP_KERNEL);
246 if (!idio16gpio)
247 return -ENOMEM;
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;
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;
271 girq = &idio16gpio->chip.irq;
272 girq->chip = &idio_16_irqchip;
273 /* This will let us handle the parent IRQ in the driver */
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;
281 raw_spin_lock_init(&idio16gpio->lock);
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;
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;
296 return 0;
299 static struct isa_driver idio_16_driver = {
300 .probe = idio_16_probe,
301 .driver = {
302 .name = "104-idio-16"
306 module_isa_driver(idio_16_driver, num_idio_16);
308 MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
309 MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver");
310 MODULE_LICENSE("GPL v2");