From patchwork Sat Nov 14 08:51:35 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bamvor Jian Zhang X-Patchwork-Id: 544746 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 1357314110D for ; Sat, 14 Nov 2015 19:52:13 +1100 (AEDT) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=linaro_org.20150623.gappssmtp.com header.i=@linaro_org.20150623.gappssmtp.com header.b=fpQd8CdO; dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751096AbbKNIwJ (ORCPT ); Sat, 14 Nov 2015 03:52:09 -0500 Received: from mail-pa0-f50.google.com ([209.85.220.50]:34747 "EHLO mail-pa0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751051AbbKNIwC (ORCPT ); Sat, 14 Nov 2015 03:52:02 -0500 Received: by padhx2 with SMTP id hx2so123674881pad.1 for ; Sat, 14 Nov 2015 00:52:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro_org.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=+ez5Nu9HtDQgHd8JRzOQNW6WKXdBdj0ZT2f2Xn/dvPU=; b=fpQd8CdOH/Ox5gS2pDtsXpK1aSS9l4RW82b5ThVvxdg7CnDfrxYBC+ZenJnuQ2xvA7 9uyI39y9RrsedbTRAQKpSEW184b2bKrcxNBz8T/A6FgXLSb5SlgDCCainJlgr0BYReEY gzipPzM37xL/aa4kRoereX4mD1316DRFARSSLpM+DWbqiOCMsmXkFiSVM7SH/0N41OcI KAWUhaD8cJ43+apxyrO7ApNzDa/u3g0H8m0uhy10KHEKo05jHUuGE43py8dgB76pDw6V 1Kc+Uo/C2IxD7nfaqEMXQlE5tb79zdMJc1a3otUVXkIUozI9CCfStAaNwJ+OkVzr8mfz ViBw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=+ez5Nu9HtDQgHd8JRzOQNW6WKXdBdj0ZT2f2Xn/dvPU=; b=gcrcPbLEy9BgAPskVRzJO7ovqOGXI3yG8zUC4ZBnNxc5YmH5X5ei5CZPaKeHC5zhJj MyQDNHBzPtwfjysY9msaSqyD/psXte/IaPWM9OkwYQGYaveRCUz7Gz9PcFgvlLOqkhst lrF6OB4k4UNWNt2fyTL94sMMyOv3VyRH77NqTi9W9cQT7IokgYL0NsV+X6qaO688HZkq 8xUVi0Uu766WfMdKZGATMHB7mVouXCDlF9LEiA2L7yJylymKw0zcqxM6vHpQaPQqGcg1 Qhok5H46JguVa1gZtbD22CnqOHP8vTcEoM4SMD+27NTi2vqC4csSFiedLkEM+v6f6JLx RkgQ== X-Gm-Message-State: ALoCoQl0DJc0aR73cUgRFgtyGPel32G3w3DgNiltHwzRtw0jKBsBypFmr+dTnWJczwErnUrgueEs X-Received: by 10.66.145.2 with SMTP id sq2mr38195940pab.7.1447491121633; Sat, 14 Nov 2015 00:52:01 -0800 (PST) Received: from linux-j170.site ([116.251.213.227]) by smtp.gmail.com with ESMTPSA id qw1sm24649722pbb.22.2015.11.14.00.51.59 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sat, 14 Nov 2015 00:52:01 -0800 (PST) From: Bamvor Jian Zhang To: linux-gpio@vger.kernel.org Cc: linus.walleij@linaro.org, broonie@kernel.org, Bamvor Jian Zhang , Kamlakant Patel Subject: [PATCH RFD 1/3] gpio/mockup: add virtual gpio device Date: Sat, 14 Nov 2015 16:51:35 +0800 Message-Id: <1447491097-14799-2-git-send-email-bamvor.zhangjian@linaro.org> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1447491097-14799-1-git-send-email-bamvor.zhangjian@linaro.org> References: <1447491097-14799-1-git-send-email-bamvor.zhangjian@linaro.org> Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org This patch add basic structure of a virtual gpio device(gpio-mockup) for testing gpio subsystem. The tester could manipulate such device through sysfs 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 Signed-off-by: Bamvor Jian Zhang --- drivers/gpio/Kconfig | 9 ++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-mockup.c | 216 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 226 insertions(+) create mode 100644 drivers/gpio/gpio-mockup.c diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index b18bea0..41d8421 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -268,6 +268,15 @@ 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 and debugfs. GPIO_SYSFS must be selected for + this test. + config GPIO_MOXART bool "MOXART GPIO support" depends on ARCH_MOXART diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 986dbd8..b91b66c 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -62,6 +62,7 @@ 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 0000000..b689389 --- /dev/null +++ b/drivers/gpio/gpio-mockup.c @@ -0,0 +1,216 @@ +/* + * GPIO Testing Device Driver + * + * Copyright (C) 2014 Kamlakant Patel + * Copyright (C) 2015 Bamvor Jian Zhang + * + * 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 +#include +#include +#include + +#define GPIO_NAME "gpio-mockup" +#define MAX_GC 5 + +enum direction { + IN, + OUT +}; + +/* + * 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; + int value; +}; + +struct mockup_gpio_controller { + struct gpio_chip gc; + struct gpio_pin_status *stats; +}; + +int conf[MAX_GC << 1]; +int params_nr; +module_param_array(conf, int, ¶ms_nr, 0400); + +const char *pins_name[MAX_GC] = {"A", "B", "C", "D", "E"}; + +static int +mockup_gpio_get(struct gpio_chip *gc, unsigned offset) +{ + struct mockup_gpio_controller *cntr = container_of(gc, + struct mockup_gpio_controller, gc); + + return cntr->stats[offset].value; +} + +static void +mockup_gpio_set(struct gpio_chip *gc, unsigned offset, int value) +{ + struct mockup_gpio_controller *cntr = container_of(gc, + struct mockup_gpio_controller, gc); + + if (value) + cntr->stats[offset].value = 1; + else + cntr->stats[offset].value = 0; + +} + +static int mockup_gpio_dirout(struct gpio_chip *gc, unsigned offset, + int value) +{ + struct mockup_gpio_controller *cntr = container_of(gc, + struct mockup_gpio_controller, gc); + + mockup_gpio_set(gc, offset, value); + cntr->stats[offset].dir = OUT; + return 0; +} + +static int mockup_gpio_dirin(struct gpio_chip *gc, unsigned offset) +{ + struct mockup_gpio_controller *cntr = container_of(gc, + struct mockup_gpio_controller, gc); + + cntr->stats[offset].dir = IN; + return 0; +} + +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.dev = 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->stats = devm_kzalloc(dev, sizeof(*cntr->stats) * cntr->gc.ngpio, + GFP_KERNEL); + if (!cntr->stats) { + ret = -ENOMEM; + goto err; + } + ret = gpiochip_add(&cntr->gc); + 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, j; + int base; + int ngpio; + + if (params_nr == 0) { + params_nr = 2; + conf[0] = 0; + conf[1] = 32; + } + + cntr = devm_kzalloc(dev, sizeof(*cntr) * params_nr, GFP_KERNEL); + if (!cntr) + return -ENOMEM; + + platform_set_drvdata(pdev, cntr); + + for (i = 0; i < params_nr >> 1; i++) { + base = conf[i << 1]; + ngpio = conf[(i << 1) + 1]; + ret = mockup_gpio_add(dev, &cntr[i], pins_name[i], base, ngpio); + if (ret) { + dev_err(dev, "gpio<%d..%d> add failed, remove added gpio\n", + base, base + ngpio); + for (j = 0; j < i; j++) + gpiochip_remove(&cntr[j].gc); + + return ret; + } + } + + return 0; +} + +static int mockup_gpio_remove(struct platform_device *pdev) +{ + struct mockup_gpio_controller *cntr = platform_get_drvdata(pdev); + int i; + + for (i = 0; i < params_nr >> 1; i++) + gpiochip_remove(&cntr[i].gc); + + return 0; +} + +static struct platform_driver mockup_gpio_driver = { + .driver = { + .name = GPIO_NAME, + }, + .probe = mockup_gpio_probe, + .remove = mockup_gpio_remove, +}; + +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 "); +MODULE_AUTHOR("Bamvor Jian Zhang "); +MODULE_DESCRIPTION("GPIO Testing driver"); +MODULE_LICENSE("GPL v2");