142 lines
3.9 KiB
C
142 lines
3.9 KiB
C
/*
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* TI TPS6586x GPIO driver
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*
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* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
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* Author: Laxman dewangan <ldewangan@nvidia.com>
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*
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* Based on tps6586x.c
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* Copyright (c) 2010 CompuLab Ltd.
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* Mike Rapoport <mike@compulab.co.il>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/errno.h>
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#include <linux/gpio.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/mfd/tps6586x.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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/* GPIO control registers */
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#define TPS6586X_GPIOSET1 0x5d
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#define TPS6586X_GPIOSET2 0x5e
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struct tps6586x_gpio {
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struct gpio_chip gpio_chip;
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struct device *parent;
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};
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static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
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{
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struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
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uint8_t val;
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int ret;
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ret = tps6586x_read(tps6586x_gpio->parent, TPS6586X_GPIOSET2, &val);
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if (ret)
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return ret;
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return !!(val & (1 << offset));
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}
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static void tps6586x_gpio_set(struct gpio_chip *gc, unsigned offset,
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int value)
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{
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struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
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tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2,
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value << offset, 1 << offset);
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}
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static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
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int value)
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{
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struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
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uint8_t val, mask;
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tps6586x_gpio_set(gc, offset, value);
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val = 0x1 << (offset * 2);
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mask = 0x3 << (offset * 2);
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return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1,
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val, mask);
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}
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static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
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{
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struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
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return tps6586x_irq_get_virq(tps6586x_gpio->parent,
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TPS6586X_INT_PLDO_0 + offset);
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}
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static int tps6586x_gpio_probe(struct platform_device *pdev)
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{
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struct tps6586x_platform_data *pdata;
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struct tps6586x_gpio *tps6586x_gpio;
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int ret;
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pdata = dev_get_platdata(pdev->dev.parent);
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tps6586x_gpio = devm_kzalloc(&pdev->dev,
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sizeof(*tps6586x_gpio), GFP_KERNEL);
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if (!tps6586x_gpio)
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return -ENOMEM;
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tps6586x_gpio->parent = pdev->dev.parent;
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tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
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tps6586x_gpio->gpio_chip.label = pdev->name;
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tps6586x_gpio->gpio_chip.parent = &pdev->dev;
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tps6586x_gpio->gpio_chip.ngpio = 4;
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tps6586x_gpio->gpio_chip.can_sleep = true;
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/* FIXME: add handling of GPIOs as dedicated inputs */
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tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output;
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tps6586x_gpio->gpio_chip.set = tps6586x_gpio_set;
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tps6586x_gpio->gpio_chip.get = tps6586x_gpio_get;
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tps6586x_gpio->gpio_chip.to_irq = tps6586x_gpio_to_irq;
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#ifdef CONFIG_OF_GPIO
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tps6586x_gpio->gpio_chip.of_node = pdev->dev.parent->of_node;
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#endif
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if (pdata && pdata->gpio_base)
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tps6586x_gpio->gpio_chip.base = pdata->gpio_base;
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else
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tps6586x_gpio->gpio_chip.base = -1;
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ret = devm_gpiochip_add_data(&pdev->dev, &tps6586x_gpio->gpio_chip,
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tps6586x_gpio);
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if (ret < 0) {
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dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
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return ret;
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}
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platform_set_drvdata(pdev, tps6586x_gpio);
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return ret;
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}
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static struct platform_driver tps6586x_gpio_driver = {
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.driver.name = "tps6586x-gpio",
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.probe = tps6586x_gpio_probe,
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};
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static int __init tps6586x_gpio_init(void)
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{
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return platform_driver_register(&tps6586x_gpio_driver);
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}
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subsys_initcall(tps6586x_gpio_init);
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