| /* |
| * 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/module.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 inline struct rc5t583_gpio *to_rc5t583_gpio(struct gpio_chip *chip) |
| { |
| return container_of(chip, struct rc5t583_gpio, gpio_chip); |
| } |
| |
| static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset) |
| { |
| struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(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 = to_rc5t583_gpio(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 = to_rc5t583_gpio(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 = to_rc5t583_gpio(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 = to_rc5t583_gpio(gc); |
| |
| if ((offset >= 0) && (offset < 8)) |
| 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 = to_rc5t583_gpio(gc); |
| struct device *parent = rc5t583_gpio->rc5t583->dev; |
| |
| rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset)); |
| } |
| |
| static int __devinit 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) { |
| dev_warn(&pdev->dev, "Mem allocation for rc5t583_gpio failed"); |
| 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 = 1, |
| rc5t583_gpio->gpio_chip.dev = &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 gpiochip_add(&rc5t583_gpio->gpio_chip); |
| } |
| |
| static int __devexit rc5t583_gpio_remove(struct platform_device *pdev) |
| { |
| struct rc5t583_gpio *rc5t583_gpio = platform_get_drvdata(pdev); |
| |
| return gpiochip_remove(&rc5t583_gpio->gpio_chip); |
| } |
| |
| static struct platform_driver rc5t583_gpio_driver = { |
| .driver = { |
| .name = "rc5t583-gpio", |
| .owner = THIS_MODULE, |
| }, |
| .probe = rc5t583_gpio_probe, |
| .remove = __devexit_p(rc5t583_gpio_remove), |
| }; |
| |
| static int __init rc5t583_gpio_init(void) |
| { |
| return platform_driver_register(&rc5t583_gpio_driver); |
| } |
| subsys_initcall(rc5t583_gpio_init); |
| |
| static void __exit rc5t583_gpio_exit(void) |
| { |
| platform_driver_unregister(&rc5t583_gpio_driver); |
| } |
| module_exit(rc5t583_gpio_exit); |
| |
| MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); |
| MODULE_DESCRIPTION("GPIO interface for RC5T583"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_ALIAS("platform:rc5t583-gpio"); |