142 lines
4.0 KiB
C
142 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* GPIO driver for RICOH583 power management chip.
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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 code
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* Copyright (C) 2011 RICOH COMPANY,LTD
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/device.h>
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#include <linux/gpio/driver.h>
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#include <linux/mfd/rc5t583.h>
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struct rc5t583_gpio {
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struct gpio_chip gpio_chip;
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struct rc5t583 *rc5t583;
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};
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static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset)
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{
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struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
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struct device *parent = rc5t583_gpio->rc5t583->dev;
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uint8_t val = 0;
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int ret;
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ret = rc5t583_read(parent, RC5T583_GPIO_MON_IOIN, &val);
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if (ret < 0)
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return ret;
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return !!(val & BIT(offset));
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}
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static void rc5t583_gpio_set(struct gpio_chip *gc, unsigned int offset, int val)
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{
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struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
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struct device *parent = rc5t583_gpio->rc5t583->dev;
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if (val)
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rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
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else
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rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
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}
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static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
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{
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struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
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struct device *parent = rc5t583_gpio->rc5t583->dev;
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int ret;
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ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
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if (ret < 0)
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return ret;
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/* Set pin to gpio mode */
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return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
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}
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static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset,
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int value)
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{
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struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
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struct device *parent = rc5t583_gpio->rc5t583->dev;
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int ret;
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rc5t583_gpio_set(gc, offset, value);
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ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
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if (ret < 0)
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return ret;
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/* Set pin to gpio mode */
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return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
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}
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static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
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{
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struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
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if (offset < RC5T583_MAX_GPIO)
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return rc5t583_gpio->rc5t583->irq_base +
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RC5T583_IRQ_GPIO0 + offset;
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return -EINVAL;
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}
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static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset)
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{
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struct rc5t583_gpio *rc5t583_gpio = gpiochip_get_data(gc);
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struct device *parent = rc5t583_gpio->rc5t583->dev;
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rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
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}
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static int rc5t583_gpio_probe(struct platform_device *pdev)
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{
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struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
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struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
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struct rc5t583_gpio *rc5t583_gpio;
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rc5t583_gpio = devm_kzalloc(&pdev->dev, sizeof(*rc5t583_gpio),
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GFP_KERNEL);
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if (!rc5t583_gpio)
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return -ENOMEM;
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rc5t583_gpio->gpio_chip.label = "gpio-rc5t583",
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rc5t583_gpio->gpio_chip.owner = THIS_MODULE,
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rc5t583_gpio->gpio_chip.free = rc5t583_gpio_free,
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rc5t583_gpio->gpio_chip.direction_input = rc5t583_gpio_dir_input,
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rc5t583_gpio->gpio_chip.direction_output = rc5t583_gpio_dir_output,
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rc5t583_gpio->gpio_chip.set = rc5t583_gpio_set,
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rc5t583_gpio->gpio_chip.get = rc5t583_gpio_get,
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rc5t583_gpio->gpio_chip.to_irq = rc5t583_gpio_to_irq,
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rc5t583_gpio->gpio_chip.ngpio = RC5T583_MAX_GPIO,
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rc5t583_gpio->gpio_chip.can_sleep = true,
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rc5t583_gpio->gpio_chip.parent = &pdev->dev;
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rc5t583_gpio->gpio_chip.base = -1;
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rc5t583_gpio->rc5t583 = rc5t583;
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if (pdata && pdata->gpio_base)
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rc5t583_gpio->gpio_chip.base = pdata->gpio_base;
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platform_set_drvdata(pdev, rc5t583_gpio);
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return devm_gpiochip_add_data(&pdev->dev, &rc5t583_gpio->gpio_chip,
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rc5t583_gpio);
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}
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static struct platform_driver rc5t583_gpio_driver = {
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.driver = {
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.name = "rc5t583-gpio",
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},
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.probe = rc5t583_gpio_probe,
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};
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static int __init rc5t583_gpio_init(void)
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{
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return platform_driver_register(&rc5t583_gpio_driver);
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}
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subsys_initcall(rc5t583_gpio_init);
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