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drivers/gpio/gpio-mockup.c
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0f98dd1b2 gpio/mockup: add ... |
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/* * 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 ", base, ngpio); else dev_err(dev, "gpio<%d..%d> add failed ", 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"); |