1 // SPDX-License-Identifier: GPL-2.0-only
3  * Driver for the Diolan DLN-2 USB-GPIO adapter
15 #include <linux/gpio/driver.h>
48 	struct gpio_chip gpio;  member
56 	/* active IRQs - not synced to hardware */
58 	/* active IRQS - synced to hardware */
83 		return -EPROTO;  in dln2_gpio_get_pin_count()
94 	return dln2_transfer_tx(dln2->pdev, cmd, &req, sizeof(req));  in dln2_gpio_pin_cmd()
106 	ret = dln2_transfer(dln2->pdev, cmd, &req, sizeof(req), &rsp, &len);  in dln2_gpio_pin_val()
110 		return -EPROTO;  in dln2_gpio_pin_val()
143 	return dln2_transfer_tx(dln2->pdev, DLN2_GPIO_PIN_SET_OUT_VAL, &req,  in dln2_gpio_pin_set_out_val()
165 	ret = dln2_transfer(dln2->pdev, DLN2_GPIO_PIN_GET_DIRECTION,  in dln2_gpio_request()
170 		ret = -EPROTO;  in dln2_gpio_request()
176 		clear_bit(offset, dln2->output_enabled);  in dln2_gpio_request()
179 		set_bit(offset, dln2->output_enabled);  in dln2_gpio_request()
182 		ret = -EPROTO;  in dln2_gpio_request()
202 	if (test_bit(offset, dln2->output_enabled))  in dln2_gpio_get_direction()
211 	int dir;  in dln2_gpio_get()  local
213 	dir = dln2_gpio_get_direction(chip, offset);  in dln2_gpio_get()
214 	if (dir < 0)  in dln2_gpio_get()
215 		return dir;  in dln2_gpio_get()
217 	if (dir == GPIO_LINE_DIRECTION_IN)  in dln2_gpio_get()
231 				   unsigned dir)  in dln2_gpio_set_direction()  argument
236 		.value = dir,  in dln2_gpio_set_direction()
240 	ret = dln2_transfer_tx(dln2->pdev, DLN2_GPIO_PIN_SET_DIRECTION,  in dln2_gpio_set_direction()
245 	if (dir == DLN2_GPIO_DIRECTION_OUT)  in dln2_gpio_set_direction()
246 		set_bit(offset, dln2->output_enabled);  in dln2_gpio_set_direction()
248 		clear_bit(offset, dln2->output_enabled);  in dln2_gpio_set_direction()
278 		return -ENOTSUPP;  in dln2_gpio_set_config()
281 	return dln2_transfer_tx(dln2->pdev, DLN2_GPIO_SET_DEBOUNCE,  in dln2_gpio_set_config()
298 	return dln2_transfer_tx(dln2->pdev, DLN2_GPIO_PIN_SET_EVENT_CFG,  in dln2_gpio_set_event_cfg()
309 	set_bit(pin, dln2->unmasked_irqs);  in dln2_irq_unmask()
318 	clear_bit(pin, dln2->unmasked_irqs);  in dln2_irq_mask()
330 		dln2->irq_type[pin] = DLN2_GPIO_EVENT_LVL_HIGH;  in dln2_irq_set_type()
333 		dln2->irq_type[pin] = DLN2_GPIO_EVENT_LVL_LOW;  in dln2_irq_set_type()
336 		dln2->irq_type[pin] = DLN2_GPIO_EVENT_CHANGE;  in dln2_irq_set_type()
339 		dln2->irq_type[pin] = DLN2_GPIO_EVENT_CHANGE_RISING;  in dln2_irq_set_type()
342 		dln2->irq_type[pin] = DLN2_GPIO_EVENT_CHANGE_FALLING;  in dln2_irq_set_type()
345 		return -EINVAL;  in dln2_irq_set_type()
356 	mutex_lock(&dln2->irq_lock);  in dln2_irq_bus_lock()
368 	enabled = test_bit(pin, dln2->enabled_irqs);  in dln2_irq_bus_unlock()
369 	unmasked = test_bit(pin, dln2->unmasked_irqs);  in dln2_irq_bus_unlock()
373 			type = dln2->irq_type[pin] & DLN2_GPIO_EVENT_MASK;  in dln2_irq_bus_unlock()
374 			set_bit(pin, dln2->enabled_irqs);  in dln2_irq_bus_unlock()
377 			clear_bit(pin, dln2->enabled_irqs);  in dln2_irq_bus_unlock()
382 			dev_err(dln2->gpio.parent, "failed to set event\n");  in dln2_irq_bus_unlock()
385 	mutex_unlock(&dln2->irq_lock);  in dln2_irq_bus_unlock()
389 	.name = "dln2-irq",
413 		dev_err(dln2->gpio.parent, "short event message\n");  in dln2_gpio_event()
417 	pin = le16_to_cpu(event->pin);  in dln2_gpio_event()
418 	if (pin >= dln2->gpio.ngpio) {  in dln2_gpio_event()
419 		dev_err(dln2->gpio.parent, "out of bounds pin %d\n", pin);  in dln2_gpio_event()
423 	switch (dln2->irq_type[pin]) {  in dln2_gpio_event()
425 		if (!event->value)  in dln2_gpio_event()
429 		if (event->value)  in dln2_gpio_event()
434 	ret = generic_handle_domain_irq(dln2->gpio.irq.domain, pin);  in dln2_gpio_event()
436 		dev_err(dln2->gpio.parent, "pin %d not mapped to IRQ\n", pin);  in dln2_gpio_event()
442 	struct device *dev = &pdev->dev;  in dln2_gpio_probe()
457 	dln2 = devm_kzalloc(&pdev->dev, sizeof(*dln2), GFP_KERNEL);  in dln2_gpio_probe()
459 		return -ENOMEM;  in dln2_gpio_probe()
461 	mutex_init(&dln2->irq_lock);  in dln2_gpio_probe()
463 	dln2->pdev = pdev;  in dln2_gpio_probe()
465 	dln2->gpio.label = "dln2";  in dln2_gpio_probe()
466 	dln2->gpio.parent = dev;  in dln2_gpio_probe()
467 	dln2->gpio.owner = THIS_MODULE;  in dln2_gpio_probe()
468 	dln2->gpio.base = -1;  in dln2_gpio_probe()
469 	dln2->gpio.ngpio = pins;  in dln2_gpio_probe()
470 	dln2->gpio.can_sleep = true;  in dln2_gpio_probe()
471 	dln2->gpio.set = dln2_gpio_set;  in dln2_gpio_probe()
472 	dln2->gpio.get = dln2_gpio_get;  in dln2_gpio_probe()
473 	dln2->gpio.request = dln2_gpio_request;  in dln2_gpio_probe()
474 	dln2->gpio.free = dln2_gpio_free;  in dln2_gpio_probe()
475 	dln2->gpio.get_direction = dln2_gpio_get_direction;  in dln2_gpio_probe()
476 	dln2->gpio.direction_input = dln2_gpio_direction_input;  in dln2_gpio_probe()
477 	dln2->gpio.direction_output = dln2_gpio_direction_output;  in dln2_gpio_probe()
478 	dln2->gpio.set_config = dln2_gpio_set_config;  in dln2_gpio_probe()
480 	girq = &dln2->gpio.irq;  in dln2_gpio_probe()
483 	girq->parent_handler = NULL;  in dln2_gpio_probe()
484 	girq->num_parents = 0;  in dln2_gpio_probe()
485 	girq->parents = NULL;  in dln2_gpio_probe()
486 	girq->default_type = IRQ_TYPE_NONE;  in dln2_gpio_probe()
487 	girq->handler = handle_simple_irq;  in dln2_gpio_probe()
491 	ret = devm_gpiochip_add_data(dev, &dln2->gpio, dln2);  in dln2_gpio_probe()
493 		dev_err(dev, "failed to add gpio chip: %d\n", ret);  in dln2_gpio_probe()
513 	.driver.name	= "dln2-gpio",
521 MODULE_DESCRIPTION("Driver for the Diolan DLN2 GPIO interface");
523 MODULE_ALIAS("platform:dln2-gpio");