1 // SPDX-License-Identifier: GPL-2.0-or-later
6  * Copyright (C) 2015-2016  Bamvor Jian Zhang <bamv2005@gmail.com>
32  * of GPIO lines.
39  * struct gpio_pin_status - structure describing a GPIO status
42  * @pull:      Configures the current pull of the GPIO as 0 (pull-down) or
43  *             1 (pull-up)
55 	struct gpio_mockup_line_status *lines;  member
89 	return chip->lines[offset].value;  in __gpio_mockup_get()
97 	scoped_guard(mutex, &chip->lock)  in gpio_mockup_get()
109 	scoped_guard(mutex, &chip->lock) {  in gpio_mockup_get_multiple()
110 		for_each_set_bit(bit, mask, gc->ngpio) {  in gpio_mockup_get_multiple()
122 	chip->lines[offset].value = !!value;  in __gpio_mockup_set()
130 	guard(mutex)(&chip->lock);  in gpio_mockup_set()
143 	guard(mutex)(&chip->lock);  in gpio_mockup_set_multiple()
145 	for_each_set_bit(bit, mask, gc->ngpio)  in gpio_mockup_set_multiple()
154 	struct gpio_mockup_line_status *line = &chip->lines[offset];  in gpio_mockup_apply_pull()
157 	guard(mutex)(&chip->lock);  in gpio_mockup_apply_pull()
159 	if (line->requested && line->dir == GPIO_LINE_DIRECTION_IN) {  in gpio_mockup_apply_pull()
164 		irq = irq_find_mapping(chip->irq_sim_domain, offset);  in gpio_mockup_apply_pull()
167 			 * This is fine - it just means, nobody is listening  in gpio_mockup_apply_pull()
187 	if (!line->requested || line->dir == GPIO_LINE_DIRECTION_IN)  in gpio_mockup_apply_pull()
191 	chip->lines[offset].pull = value;  in gpio_mockup_apply_pull()
208 	return -ENOTSUPP;  in gpio_mockup_set_config()
216 	scoped_guard(mutex, &chip->lock) {  in gpio_mockup_dirout()
217 		chip->lines[offset].dir = GPIO_LINE_DIRECTION_OUT;  in gpio_mockup_dirout()
228 	scoped_guard(mutex, &chip->lock)  in gpio_mockup_dirin()
229 		chip->lines[offset].dir = GPIO_LINE_DIRECTION_IN;  in gpio_mockup_dirin()
239 	scoped_guard(mutex, &chip->lock)  in gpio_mockup_get_direction()
240 		direction = chip->lines[offset].dir;  in gpio_mockup_get_direction()
249 	return irq_create_mapping(chip->irq_sim_domain, offset);  in gpio_mockup_to_irq()
256 	scoped_guard(mutex, &chip->lock)  in gpio_mockup_request()
257 		chip->lines[offset].requested = true;  in gpio_mockup_request()
266 	guard(mutex)(&chip->lock);  in gpio_mockup_free()
268 	chip->lines[offset].requested = false;  in gpio_mockup_free()
269 	__gpio_mockup_set(chip, offset, chip->lines[offset].pull);  in gpio_mockup_free()
286 	sfile = file->private_data;  in gpio_mockup_debugfs_read()
287 	priv = sfile->private;  in gpio_mockup_debugfs_read()
288 	chip = priv->chip;  in gpio_mockup_debugfs_read()
289 	gc = &chip->gc;  in gpio_mockup_debugfs_read()
291 	val = gpio_mockup_get(gc, priv->offset);  in gpio_mockup_debugfs_read()
306 		return -EINVAL;  in gpio_mockup_debugfs_write()
312 		return -EINVAL;  in gpio_mockup_debugfs_write()
314 	sfile = file->private_data;  in gpio_mockup_debugfs_write()
315 	priv = sfile->private;  in gpio_mockup_debugfs_write()
316 	rv = gpio_mockup_apply_pull(priv->chip, priv->offset, val);  in gpio_mockup_debugfs_write()
325 	return single_open(file, NULL, inode->i_private);  in gpio_mockup_debugfs_open()
330  * name under /sys/kernel/debug/gpio-mockup/. Each line is represented by
334  * line's file changes the current *pull*. Default pull for mockup lines is
338  * - when a line pulled down is requested in output mode and driven high, its
340  * - when the line is requested in output mode and driven high, writing 0 to
343  * - line requested in input mode always reports the same value as its pull
345  * - when the line is requested in input mode and monitored for events, writing
366 	gc = &chip->gc;  in gpio_mockup_debugfs_setup()
370 	 * gpio-mockup so using device_find_any_child() is OK.  in gpio_mockup_debugfs_setup()
377 	chip->dbg_dir = debugfs_create_dir(devname, gpio_mockup_dbg_dir);  in gpio_mockup_debugfs_setup()
379 	for (i = 0; i < gc->ngpio; i++) {  in gpio_mockup_debugfs_setup()
388 		priv->chip = chip;  in gpio_mockup_debugfs_setup()
389 		priv->offset = i;  in gpio_mockup_debugfs_setup()
391 		debugfs_create_file(name, 0600, chip->dbg_dir, priv,  in gpio_mockup_debugfs_setup()
396 static void gpio_mockup_debugfs_cleanup(void *data)  in gpio_mockup_debugfs_cleanup()  argument
398 	struct gpio_mockup_chip *chip = data;  in gpio_mockup_debugfs_cleanup()
400 	debugfs_remove_recursive(chip->dbg_dir);  in gpio_mockup_debugfs_cleanup()
403 static void gpio_mockup_dispose_mappings(void *data)  in gpio_mockup_dispose_mappings()  argument
405 	struct gpio_mockup_chip *chip = data;  in gpio_mockup_dispose_mappings()
406 	struct gpio_chip *gc = &chip->gc;  in gpio_mockup_dispose_mappings()
409 	for (i = 0; i < gc->ngpio; i++) {  in gpio_mockup_dispose_mappings()
410 		irq = irq_find_mapping(chip->irq_sim_domain, i);  in gpio_mockup_dispose_mappings()
425 	dev = &pdev->dev;  in gpio_mockup_probe()
427 	rv = device_property_read_u32(dev, "gpio-base", &base);  in gpio_mockup_probe()
429 		base = -1;  in gpio_mockup_probe()
431 	rv = device_property_read_u16(dev, "nr-gpios", &ngpio);  in gpio_mockup_probe()
435 	rv = device_property_read_string(dev, "chip-label", &name);  in gpio_mockup_probe()
441 		return -ENOMEM;  in gpio_mockup_probe()
443 	mutex_init(&chip->lock);  in gpio_mockup_probe()
445 	gc = &chip->gc;  in gpio_mockup_probe()
446 	gc->base = base;  in gpio_mockup_probe()
447 	gc->ngpio = ngpio;  in gpio_mockup_probe()
448 	gc->label = name;  in gpio_mockup_probe()
449 	gc->owner = THIS_MODULE;  in gpio_mockup_probe()
450 	gc->parent = dev;  in gpio_mockup_probe()
451 	gc->get = gpio_mockup_get;  in gpio_mockup_probe()
452 	gc->set = gpio_mockup_set;  in gpio_mockup_probe()
453 	gc->get_multiple = gpio_mockup_get_multiple;  in gpio_mockup_probe()
454 	gc->set_multiple = gpio_mockup_set_multiple;  in gpio_mockup_probe()
455 	gc->direction_output = gpio_mockup_dirout;  in gpio_mockup_probe()
456 	gc->direction_input = gpio_mockup_dirin;  in gpio_mockup_probe()
457 	gc->get_direction = gpio_mockup_get_direction;  in gpio_mockup_probe()
458 	gc->set_config = gpio_mockup_set_config;  in gpio_mockup_probe()
459 	gc->to_irq = gpio_mockup_to_irq;  in gpio_mockup_probe()
460 	gc->request = gpio_mockup_request;  in gpio_mockup_probe()
461 	gc->free = gpio_mockup_free;  in gpio_mockup_probe()
463 	chip->lines = devm_kcalloc(dev, gc->ngpio,  in gpio_mockup_probe()
464 				   sizeof(*chip->lines), GFP_KERNEL);  in gpio_mockup_probe()
465 	if (!chip->lines)  in gpio_mockup_probe()
466 		return -ENOMEM;  in gpio_mockup_probe()
468 	for (i = 0; i < gc->ngpio; i++)  in gpio_mockup_probe()
469 		chip->lines[i].dir = GPIO_LINE_DIRECTION_IN;  in gpio_mockup_probe()
471 	chip->irq_sim_domain = devm_irq_domain_create_sim(dev, NULL,  in gpio_mockup_probe()
472 							  gc->ngpio);  in gpio_mockup_probe()
473 	if (IS_ERR(chip->irq_sim_domain))  in gpio_mockup_probe()
474 		return PTR_ERR(chip->irq_sim_domain);  in gpio_mockup_probe()
480 	rv = devm_gpiochip_add_data(dev, &chip->gc, chip);  in gpio_mockup_probe()
490 	{ .compatible = "gpio-mockup", },
497 		.name = "gpio-mockup",
516 		fwnode = dev_fwnode(&pdev->dev);  in gpio_mockup_unregister_pdevs()
536 	snprintf(chip_label, sizeof(chip_label), "gpio-mockup-%c", idx + 'A');  in gpio_mockup_register_chip()
537 	properties[prop++] = PROPERTY_ENTRY_STRING("chip-label", chip_label);  in gpio_mockup_register_chip()
541 		properties[prop++] = PROPERTY_ENTRY_U32("gpio-base", base);  in gpio_mockup_register_chip()
544 			 : gpio_mockup_range_ngpio(idx) - base;  in gpio_mockup_register_chip()
545 	properties[prop++] = PROPERTY_ENTRY_U16("nr-gpios", ngpio);  in gpio_mockup_register_chip()
550 			return -ENOMEM;  in gpio_mockup_register_chip()
553 					"gpio-line-names", line_names, ngpio);  in gpio_mockup_register_chip()
562 	pdevinfo.name = "gpio-mockup";  in gpio_mockup_register_chip()
585 		return -EINVAL;  in gpio_mockup_init()
591 	 * The second value in the <base GPIO - number of GPIOS> pair must  in gpio_mockup_init()
596 			return -EINVAL;  in gpio_mockup_init()
599 	gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup", NULL);  in gpio_mockup_init()