Commit 0f98dd1b authored by Bamvor Jian Zhang's avatar Bamvor Jian Zhang Committed by Linus Walleij
Browse files

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: default avatarKamlakant Patel <kamlakant.patel@broadcom.com>
Signed-off-by: default avatarBamvor Jian Zhang <bamvor.zhangjian@linaro.org>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent e3296f19

Documentation/kernel-parameters.txt

+4 −0
Original line number Diff line number Diff line
@@ -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.

drivers/gpio/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -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

drivers/gpio/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/gpio/gpio-mockup.c

0 → 100644
+214 −0
Original line number Diff line number Diff line 
/*

 * 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");

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