/* * MOXA ART SoCs GPIO driver. * * Copyright (C) 2013 Jonas Jensen * * Jonas Jensen <jonas.jensen@gmail.com> * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #include <linux/err.h> #include <linux/init.h> #include <linux/irq.h> #include <linux/io.h> #include <linux/platform_device.h> #include <linux/module.h> #include <linux/of_address.h> #include <linux/of_gpio.h> #include <linux/pinctrl/consumer.h> #include <linux/delay.h> #include <linux/timer.h> #include <linux/bitops.h> #include <linux/gpio/driver.h> #define GPIO_DATA_OUT 0x00 #define GPIO_DATA_IN 0x04 #define GPIO_PIN_DIRECTION 0x08 static int moxart_gpio_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct resource *res; struct gpio_chip *gc; void __iomem *base; int ret; gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL); if (!gc) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); base = devm_ioremap_resource(dev, res); if (IS_ERR(base)) return PTR_ERR(base); ret = bgpio_init(gc, dev, 4, base + GPIO_DATA_IN, base + GPIO_DATA_OUT, NULL, base + GPIO_PIN_DIRECTION, NULL, BGPIOF_READ_OUTPUT_REG_SET); if (ret) { dev_err(&pdev->dev, "bgpio_init failed\n"); return ret; } gc->label = "moxart-gpio"; gc->request = gpiochip_generic_request; gc->free = gpiochip_generic_free; gc->bgpio_data = gc->read_reg(gc->reg_set); gc->base = 0; gc->ngpio = 32; gc->parent = dev; gc->owner = THIS_MODULE; ret = gpiochip_add_data(gc, NULL); if (ret) { dev_err(dev, "%s: gpiochip_add failed\n", dev->of_node->full_name); return ret; } return ret; } static const struct of_device_id moxart_gpio_match[] = { { .compatible = "moxa,moxart-gpio" }, { } }; static struct platform_driver moxart_gpio_driver = { .driver = { .name = "moxart-gpio", .of_match_table = moxart_gpio_match, }, .probe = moxart_gpio_probe, }; module_platform_driver(moxart_gpio_driver); MODULE_DESCRIPTION("MOXART GPIO chip driver"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");