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drivers/gpio/gpio-rc5t583.c
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/* * GPIO driver for RICOH583 power management chip. * * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. * Author: Laxman dewangan <ldewangan@nvidia.com> * * Based on code * Copyright (C) 2011 RICOH COMPANY,LTD * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * */ #include <linux/init.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/platform_device.h> #include <linux/device.h> #include <linux/gpio.h> #include <linux/mfd/rc5t583.h> struct rc5t583_gpio { struct gpio_chip gpio_chip; struct rc5t583 *rc5t583; }; static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset) { struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); struct device *parent = rc5t583_gpio->rc5t583->dev; uint8_t val = 0; int ret; ret = rc5t583_read(parent, RC5T583_GPIO_MON_IOIN, &val); if (ret < 0) return ret; return !!(val & BIT(offset)); } static void rc5t583_gpio_set(struct gpio_chip *gc, unsigned int offset, int val) { struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); struct device *parent = rc5t583_gpio->rc5t583->dev; if (val) rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset)); else rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset)); } static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset) { struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); struct device *parent = rc5t583_gpio->rc5t583->dev; int ret; ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset)); if (ret < 0) return ret; /* Set pin to gpio mode */ return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset)); } static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset, int value) { struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); struct device *parent = rc5t583_gpio->rc5t583->dev; int ret; rc5t583_gpio_set(gc, offset, value); ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset)); if (ret < 0) return ret; /* Set pin to gpio mode */ return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset)); } static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset) { struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); if (offset < RC5T583_MAX_GPIO) return rc5t583_gpio->rc5t583->irq_base + RC5T583_IRQ_GPIO0 + offset; return -EINVAL; } static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset) { struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc); struct device *parent = rc5t583_gpio->rc5t583->dev; rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset)); } static int rc5t583_gpio_probe(struct platform_device *pdev) { struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent); struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev); struct rc5t583_gpio *rc5t583_gpio; rc5t583_gpio = devm_kzalloc(&pdev->dev, sizeof(*rc5t583_gpio), GFP_KERNEL); if (!rc5t583_gpio) return -ENOMEM; rc5t583_gpio->gpio_chip.label = "gpio-rc5t583", rc5t583_gpio->gpio_chip.owner = THIS_MODULE, rc5t583_gpio->gpio_chip.free = rc5t583_gpio_free, rc5t583_gpio->gpio_chip.direction_input = rc5t583_gpio_dir_input, rc5t583_gpio->gpio_chip.direction_output = rc5t583_gpio_dir_output, rc5t583_gpio->gpio_chip.set = rc5t583_gpio_set, rc5t583_gpio->gpio_chip.get = rc5t583_gpio_get, rc5t583_gpio->gpio_chip.to_irq = rc5t583_gpio_to_irq, rc5t583_gpio->gpio_chip.ngpio = RC5T583_MAX_GPIO, rc5t583_gpio->gpio_chip.can_sleep = true, rc5t583_gpio->gpio_chip.parent = &pdev->dev; rc5t583_gpio->gpio_chip.base = -1; rc5t583_gpio->rc5t583 = rc5t583; if (pdata && pdata->gpio_base) rc5t583_gpio->gpio_chip.base = pdata->gpio_base; platform_set_drvdata(pdev, rc5t583_gpio); return devm_gpiochip_add_data(&pdev->dev, &rc5t583_gpio->gpio_chip, rc5t583_gpio); } static struct platform_driver rc5t583_gpio_driver = { .driver = { .name = "rc5t583-gpio", }, .probe = rc5t583_gpio_probe, }; static int __init rc5t583_gpio_init(void) { return platform_driver_register(&rc5t583_gpio_driver); } subsys_initcall(rc5t583_gpio_init); |