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>

4 files changed, 231 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 46c030a49186..61f4dbf9d97e 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1364,6 +1364,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                         Format: <unsigned int> such that (rxsize & ~0x1fffc0) == 0.
                         Default: 1024
 
+        gpio-mockup.gpio_mockup_ranges
+                        [HW] Sets the ranges of gpiochip of for this device.
+                        Format: <start1>,<end1>,<start2>,<end2>...
+
         hardlockup_all_cpu_backtrace=
                         [KNL] Should the hard-lockup detector generate
                         backtraces on all cpus.
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 0e41c45a2936..79429b9b4e20 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -279,6 +279,18 @@ config GPIO_MM_LANTIQ
           (EBU) found on Lantiq SoCs. The gpios are output only as they are
           created by attaching a 16bit latch to the bus.
 
+config GPIO_MOCKUP
+        tristate "GPIO Testing Driver"
+        depends on GPIOLIB
+        select GPIO_SYSFS
+        help
+          This enables GPIO Testing driver, which provides a way to test GPIO
+          subsystem through sysfs(or char device) and debugfs. GPIO_SYSFS
+          must be selected for this test.
+          User could use it through the script in
+          tools/testing/selftests/gpio/gpio-mockup.sh. Reference the usage in
+          it.
+
 config GPIO_MOXART
         bool "MOXART GPIO support"
         depends on ARCH_MOXART || COMPILE_TEST
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index b3e039c3ae8d..915c7de1dd1b 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -74,6 +74,7 @@ obj-$(CONFIG_GPIO_MC9S08DZ60)	+= gpio-mc9s08dz60.o
 obj-$(CONFIG_GPIO_MCP23S08)     += gpio-mcp23s08.o
 obj-$(CONFIG_GPIO_ML_IOH)       += gpio-ml-ioh.o
 obj-$(CONFIG_GPIO_MM_LANTIQ)    += gpio-mm-lantiq.o
+obj-$(CONFIG_GPIO_MOCKUP)      += gpio-mockup.o
 obj-$(CONFIG_GPIO_MOXART)       += gpio-moxart.o
 obj-$(CONFIG_GPIO_MPC5200)      += gpio-mpc5200.o
 obj-$(CONFIG_GPIO_MPC8XXX)      += gpio-mpc8xxx.o
diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
new file mode 100644
index 000000000000..1ef85b0c2b1f
--- /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");