Lines Matching +full:gpio +full:- +full:lines
1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * GPIO Testing Device Driver
6 * Copyright (C) 2015-2016 Bamvor Jian Zhang <bamv2005@gmail.com>
13 #include <linux/gpio/driver.h>
31 * We're storing two values per chip: the GPIO base and the number
32 * of GPIO lines.
39 * struct gpio_pin_status - structure describing a GPIO status
40 * @dir: Configures direction of gpio as "in" or "out"
41 * @value: Configures status of the gpio as 0(low) or 1(high)
51 struct gpio_mockup_line_status *lines; member
86 return chip->lines[offset].value; in __gpio_mockup_get()
94 mutex_lock(&chip->lock); in gpio_mockup_get()
96 mutex_unlock(&chip->lock); in gpio_mockup_get()
107 mutex_lock(&chip->lock); in gpio_mockup_get_multiple()
108 for_each_set_bit(bit, mask, gc->ngpio) { in gpio_mockup_get_multiple()
112 mutex_unlock(&chip->lock); in gpio_mockup_get_multiple()
120 chip->lines[offset].value = !!value; in __gpio_mockup_set()
128 mutex_lock(&chip->lock); in gpio_mockup_set()
130 mutex_unlock(&chip->lock); in gpio_mockup_set()
139 mutex_lock(&chip->lock); in gpio_mockup_set_multiple()
140 for_each_set_bit(bit, mask, gc->ngpio) in gpio_mockup_set_multiple()
142 mutex_unlock(&chip->lock); in gpio_mockup_set_multiple()
148 struct gpio_chip *gc = &chip->gc; in gpio_mockup_apply_pull()
152 mutex_lock(&chip->lock); in gpio_mockup_apply_pull()
154 if (test_bit(FLAG_REQUESTED, &desc->flags) && in gpio_mockup_apply_pull()
155 !test_bit(FLAG_IS_OUT, &desc->flags)) { in gpio_mockup_apply_pull()
160 irq = irq_find_mapping(chip->irq_sim_domain, offset); in gpio_mockup_apply_pull()
163 * This is fine - it just means, nobody is listening in gpio_mockup_apply_pull()
183 if (!test_bit(FLAG_REQUESTED, &desc->flags) || in gpio_mockup_apply_pull()
184 !test_bit(FLAG_IS_OUT, &desc->flags)) in gpio_mockup_apply_pull()
188 chip->lines[offset].pull = value; in gpio_mockup_apply_pull()
189 mutex_unlock(&chip->lock); in gpio_mockup_apply_pull()
206 return -ENOTSUPP; in gpio_mockup_set_config()
214 mutex_lock(&chip->lock); in gpio_mockup_dirout()
215 chip->lines[offset].dir = GPIO_LINE_DIRECTION_OUT; in gpio_mockup_dirout()
217 mutex_unlock(&chip->lock); in gpio_mockup_dirout()
226 mutex_lock(&chip->lock); in gpio_mockup_dirin()
227 chip->lines[offset].dir = GPIO_LINE_DIRECTION_IN; in gpio_mockup_dirin()
228 mutex_unlock(&chip->lock); in gpio_mockup_dirin()
238 mutex_lock(&chip->lock); in gpio_mockup_get_direction()
239 direction = chip->lines[offset].dir; in gpio_mockup_get_direction()
240 mutex_unlock(&chip->lock); in gpio_mockup_get_direction()
249 return irq_create_mapping(chip->irq_sim_domain, offset); in gpio_mockup_to_irq()
256 __gpio_mockup_set(chip, offset, chip->lines[offset].pull); in gpio_mockup_free()
273 sfile = file->private_data; in gpio_mockup_debugfs_read()
274 priv = sfile->private; in gpio_mockup_debugfs_read()
275 chip = priv->chip; in gpio_mockup_debugfs_read()
276 gc = &chip->gc; in gpio_mockup_debugfs_read()
278 val = gpio_mockup_get(gc, priv->offset); in gpio_mockup_debugfs_read()
293 return -EINVAL; in gpio_mockup_debugfs_write()
299 return -EINVAL; in gpio_mockup_debugfs_write()
301 sfile = file->private_data; in gpio_mockup_debugfs_write()
302 priv = sfile->private; in gpio_mockup_debugfs_write()
303 rv = gpio_mockup_apply_pull(priv->chip, priv->offset, val); in gpio_mockup_debugfs_write()
312 return single_open(file, NULL, inode->i_private); in gpio_mockup_debugfs_open()
317 * name under /sys/kernel/debug/gpio-mockup/. Each line is represented by
321 * line's file changes the current *pull*. Default pull for mockup lines is
325 * - when a line pulled down is requested in output mode and driven high, its
327 * - when the line is requested in output mode and driven high, writing 0 to
330 * - line requested in input mode always reports the same value as its pull
332 * - when the line is requested in input mode and monitored for events, writing
354 gc = &chip->gc; in gpio_mockup_debugfs_setup()
355 devname = dev_name(&gc->gpiodev->dev); in gpio_mockup_debugfs_setup()
357 chip->dbg_dir = debugfs_create_dir(devname, gpio_mockup_dbg_dir); in gpio_mockup_debugfs_setup()
359 for (i = 0; i < gc->ngpio; i++) { in gpio_mockup_debugfs_setup()
368 priv->chip = chip; in gpio_mockup_debugfs_setup()
369 priv->offset = i; in gpio_mockup_debugfs_setup()
370 priv->desc = gpiochip_get_desc(gc, i); in gpio_mockup_debugfs_setup()
372 debugfs_create_file(name, 0600, chip->dbg_dir, priv, in gpio_mockup_debugfs_setup()
381 debugfs_remove_recursive(chip->dbg_dir); in gpio_mockup_debugfs_cleanup()
387 struct gpio_chip *gc = &chip->gc; in gpio_mockup_dispose_mappings()
390 for (i = 0; i < gc->ngpio; i++) { in gpio_mockup_dispose_mappings()
391 irq = irq_find_mapping(chip->irq_sim_domain, i); in gpio_mockup_dispose_mappings()
406 dev = &pdev->dev; in gpio_mockup_probe()
408 rv = device_property_read_u32(dev, "gpio-base", &base); in gpio_mockup_probe()
410 base = -1; in gpio_mockup_probe()
412 rv = device_property_read_u16(dev, "nr-gpios", &ngpio); in gpio_mockup_probe()
416 rv = device_property_read_string(dev, "chip-label", &name); in gpio_mockup_probe()
422 return -ENOMEM; in gpio_mockup_probe()
424 mutex_init(&chip->lock); in gpio_mockup_probe()
426 gc = &chip->gc; in gpio_mockup_probe()
427 gc->base = base; in gpio_mockup_probe()
428 gc->ngpio = ngpio; in gpio_mockup_probe()
429 gc->label = name; in gpio_mockup_probe()
430 gc->owner = THIS_MODULE; in gpio_mockup_probe()
431 gc->parent = dev; in gpio_mockup_probe()
432 gc->get = gpio_mockup_get; in gpio_mockup_probe()
433 gc->set = gpio_mockup_set; in gpio_mockup_probe()
434 gc->get_multiple = gpio_mockup_get_multiple; in gpio_mockup_probe()
435 gc->set_multiple = gpio_mockup_set_multiple; in gpio_mockup_probe()
436 gc->direction_output = gpio_mockup_dirout; in gpio_mockup_probe()
437 gc->direction_input = gpio_mockup_dirin; in gpio_mockup_probe()
438 gc->get_direction = gpio_mockup_get_direction; in gpio_mockup_probe()
439 gc->set_config = gpio_mockup_set_config; in gpio_mockup_probe()
440 gc->to_irq = gpio_mockup_to_irq; in gpio_mockup_probe()
441 gc->free = gpio_mockup_free; in gpio_mockup_probe()
443 chip->lines = devm_kcalloc(dev, gc->ngpio, in gpio_mockup_probe()
444 sizeof(*chip->lines), GFP_KERNEL); in gpio_mockup_probe()
445 if (!chip->lines) in gpio_mockup_probe()
446 return -ENOMEM; in gpio_mockup_probe()
448 for (i = 0; i < gc->ngpio; i++) in gpio_mockup_probe()
449 chip->lines[i].dir = GPIO_LINE_DIRECTION_IN; in gpio_mockup_probe()
451 chip->irq_sim_domain = devm_irq_domain_create_sim(dev, NULL, in gpio_mockup_probe()
452 gc->ngpio); in gpio_mockup_probe()
453 if (IS_ERR(chip->irq_sim_domain)) in gpio_mockup_probe()
454 return PTR_ERR(chip->irq_sim_domain); in gpio_mockup_probe()
460 rv = devm_gpiochip_add_data(dev, &chip->gc, chip); in gpio_mockup_probe()
470 { .compatible = "gpio-mockup", },
477 .name = "gpio-mockup",
496 fwnode = dev_fwnode(&pdev->dev); in gpio_mockup_unregister_pdevs()
516 snprintf(chip_label, sizeof(chip_label), "gpio-mockup-%c", idx + 'A'); in gpio_mockup_register_chip()
517 properties[prop++] = PROPERTY_ENTRY_STRING("chip-label", chip_label); in gpio_mockup_register_chip()
521 properties[prop++] = PROPERTY_ENTRY_U32("gpio-base", base); in gpio_mockup_register_chip()
524 : gpio_mockup_range_ngpio(idx) - base; in gpio_mockup_register_chip()
525 properties[prop++] = PROPERTY_ENTRY_U16("nr-gpios", ngpio); in gpio_mockup_register_chip()
530 return -ENOMEM; in gpio_mockup_register_chip()
533 "gpio-line-names", line_names, ngpio); in gpio_mockup_register_chip()
542 pdevinfo.name = "gpio-mockup"; in gpio_mockup_register_chip()
565 return -EINVAL; in gpio_mockup_init()
571 * The second value in the <base GPIO - number of GPIOS> pair must in gpio_mockup_init()
576 return -EINVAL; in gpio_mockup_init()
579 gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup", NULL); in gpio_mockup_init()
614 MODULE_DESCRIPTION("GPIO Testing driver");