gpio/mockup: add virtual gpio device
This patch add basic structure of a virtual gpio device(gpio-mockup)
for testing gpio subsystem. The tester could manipulate such device
through userspace(sysfs or char device) and check the result from
debugfs.
Currently, it support one or more gpiochip(determined by module
parameters with base,ngpio pair). One could test the overlap of
different gpiochip and test the direction and/or output values of
these chips.
Signed-off-by: Kamlakant Patel <kamlakant.patel@broadcom.com>
Signed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
new file mode 100644
index 0000000..1ef85b0
--- /dev/null
+++ b/drivers/gpio/gpio-mockup.c
@@ -0,0 +1,214 @@
+/*
+ * GPIO Testing Device Driver
+ *
+ * Copyright (C) 2014 Kamlakant Patel <kamlakant.patel@broadcom.com>
+ * Copyright (C) 2015-2016 Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/gpio/driver.h>
+#include <linux/platform_device.h>
+
+#define GPIO_NAME "gpio-mockup"
+#define MAX_GC 10
+
+enum direction {
+ OUT,
+ IN
+};
+
+/*
+ * struct gpio_pin_status - structure describing a GPIO status
+ * @dir: Configures direction of gpio as "in" or "out", 0=in, 1=out
+ * @value: Configures status of the gpio as 0(low) or 1(high)
+ */
+struct gpio_pin_status {
+ enum direction dir;
+ bool value;
+};
+
+struct mockup_gpio_controller {
+ struct gpio_chip gc;
+ struct gpio_pin_status *stats;
+};
+
+static int gpio_mockup_ranges[MAX_GC << 1];
+static int gpio_mockup_params_nr;
+module_param_array(gpio_mockup_ranges, int, &gpio_mockup_params_nr, 0400);
+
+const char pins_name_start = 'A';
+
+static int mockup_gpio_get(struct gpio_chip *gc, unsigned int offset)
+{
+ struct mockup_gpio_controller *cntr = gpiochip_get_data(gc);
+
+ return cntr->stats[offset].value;
+}
+
+static void mockup_gpio_set(struct gpio_chip *gc, unsigned int offset,
+ int value)
+{
+ struct mockup_gpio_controller *cntr = gpiochip_get_data(gc);
+
+ cntr->stats[offset].value = !!value;
+}
+
+static int mockup_gpio_dirout(struct gpio_chip *gc, unsigned int offset,
+ int value)
+{
+ struct mockup_gpio_controller *cntr = gpiochip_get_data(gc);
+
+ mockup_gpio_set(gc, offset, value);
+ cntr->stats[offset].dir = OUT;
+ return 0;
+}
+
+static int mockup_gpio_dirin(struct gpio_chip *gc, unsigned int offset)
+{
+ struct mockup_gpio_controller *cntr = gpiochip_get_data(gc);
+
+ cntr->stats[offset].dir = IN;
+ return 0;
+}
+
+static int mockup_gpio_get_direction(struct gpio_chip *gc, unsigned int offset)
+{
+ struct mockup_gpio_controller *cntr = gpiochip_get_data(gc);
+
+ return cntr->stats[offset].dir;
+}
+
+static int mockup_gpio_add(struct device *dev,
+ struct mockup_gpio_controller *cntr,
+ const char *name, int base, int ngpio)
+{
+ int ret;
+
+ cntr->gc.base = base;
+ cntr->gc.ngpio = ngpio;
+ cntr->gc.label = name;
+ cntr->gc.owner = THIS_MODULE;
+ cntr->gc.parent = dev;
+ cntr->gc.get = mockup_gpio_get;
+ cntr->gc.set = mockup_gpio_set;
+ cntr->gc.direction_output = mockup_gpio_dirout;
+ cntr->gc.direction_input = mockup_gpio_dirin;
+ cntr->gc.get_direction = mockup_gpio_get_direction;
+ cntr->stats = devm_kzalloc(dev, sizeof(*cntr->stats) * cntr->gc.ngpio,
+ GFP_KERNEL);
+ if (!cntr->stats) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ ret = devm_gpiochip_add_data(dev, &cntr->gc, cntr);
+ if (ret)
+ goto err;
+
+ dev_info(dev, "gpio<%d..%d> add successful!", base, base + ngpio);
+ return 0;
+err:
+ dev_err(dev, "gpio<%d..%d> add failed!", base, base + ngpio);
+ return ret;
+}
+
+static int mockup_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mockup_gpio_controller *cntr;
+ int ret;
+ int i;
+ int base;
+ int ngpio;
+ char chip_name[sizeof(GPIO_NAME) + 3];
+
+ if (gpio_mockup_params_nr < 2)
+ return -EINVAL;
+
+ cntr = devm_kzalloc(dev, sizeof(*cntr) * (gpio_mockup_params_nr >> 1),
+ GFP_KERNEL);
+ if (!cntr)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, cntr);
+
+ for (i = 0; i < gpio_mockup_params_nr >> 1; i++) {
+ base = gpio_mockup_ranges[i * 2];
+ if (base == -1)
+ ngpio = gpio_mockup_ranges[i * 2 + 1];
+ else
+ ngpio = gpio_mockup_ranges[i * 2 + 1] - base;
+
+ if (ngpio >= 0) {
+ sprintf(chip_name, "%s-%c", GPIO_NAME,
+ pins_name_start + i);
+ ret = mockup_gpio_add(dev, &cntr[i],
+ chip_name, base, ngpio);
+ } else {
+ ret = -1;
+ }
+ if (ret) {
+ if (base < 0)
+ dev_err(dev, "gpio<%d..%d> add failed\n",
+ base, ngpio);
+ else
+ dev_err(dev, "gpio<%d..%d> add failed\n",
+ base, base + ngpio);
+
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static struct platform_driver mockup_gpio_driver = {
+ .driver = {
+ .name = GPIO_NAME,
+ },
+ .probe = mockup_gpio_probe,
+};
+
+static struct platform_device *pdev;
+static int __init mock_device_init(void)
+{
+ int err;
+
+ pdev = platform_device_alloc(GPIO_NAME, -1);
+ if (!pdev)
+ return -ENOMEM;
+
+ err = platform_device_add(pdev);
+ if (err) {
+ platform_device_put(pdev);
+ return err;
+ }
+
+ err = platform_driver_register(&mockup_gpio_driver);
+ if (err) {
+ platform_device_unregister(pdev);
+ return err;
+ }
+
+ return 0;
+}
+
+static void __exit mock_device_exit(void)
+{
+ platform_driver_unregister(&mockup_gpio_driver);
+ platform_device_unregister(pdev);
+}
+
+module_init(mock_device_init);
+module_exit(mock_device_exit);
+
+MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
+MODULE_AUTHOR("Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>");
+MODULE_DESCRIPTION("GPIO Testing driver");
+MODULE_LICENSE("GPL v2");