| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * TI TPS6586x GPIO driver |
| * |
| * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. |
| * Author: Laxman dewangan <ldewangan@nvidia.com> |
| * |
| * Based on tps6586x.c |
| * Copyright (c) 2010 CompuLab Ltd. |
| * Mike Rapoport <mike@compulab.co.il> |
| */ |
| |
| #include <linux/errno.h> |
| #include <linux/gpio/driver.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/mfd/tps6586x.h> |
| #include <linux/of_device.h> |
| #include <linux/platform_device.h> |
| |
| /* GPIO control registers */ |
| #define TPS6586X_GPIOSET1 0x5d |
| #define TPS6586X_GPIOSET2 0x5e |
| |
| struct tps6586x_gpio { |
| struct gpio_chip gpio_chip; |
| struct device *parent; |
| }; |
| |
| static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset) |
| { |
| struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc); |
| uint8_t val; |
| int ret; |
| |
| ret = tps6586x_read(tps6586x_gpio->parent, TPS6586X_GPIOSET2, &val); |
| if (ret) |
| return ret; |
| |
| return !!(val & (1 << offset)); |
| } |
| |
| static void tps6586x_gpio_set(struct gpio_chip *gc, unsigned offset, |
| int value) |
| { |
| struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc); |
| |
| tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2, |
| value << offset, 1 << offset); |
| } |
| |
| static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset, |
| int value) |
| { |
| struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc); |
| uint8_t val, mask; |
| |
| tps6586x_gpio_set(gc, offset, value); |
| |
| val = 0x1 << (offset * 2); |
| mask = 0x3 << (offset * 2); |
| |
| return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1, |
| val, mask); |
| } |
| |
| static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset) |
| { |
| struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc); |
| |
| return tps6586x_irq_get_virq(tps6586x_gpio->parent, |
| TPS6586X_INT_PLDO_0 + offset); |
| } |
| |
| static int tps6586x_gpio_probe(struct platform_device *pdev) |
| { |
| struct tps6586x_platform_data *pdata; |
| struct tps6586x_gpio *tps6586x_gpio; |
| int ret; |
| |
| pdata = dev_get_platdata(pdev->dev.parent); |
| tps6586x_gpio = devm_kzalloc(&pdev->dev, |
| sizeof(*tps6586x_gpio), GFP_KERNEL); |
| if (!tps6586x_gpio) |
| return -ENOMEM; |
| |
| tps6586x_gpio->parent = pdev->dev.parent; |
| |
| tps6586x_gpio->gpio_chip.owner = THIS_MODULE; |
| tps6586x_gpio->gpio_chip.label = pdev->name; |
| tps6586x_gpio->gpio_chip.parent = &pdev->dev; |
| tps6586x_gpio->gpio_chip.ngpio = 4; |
| tps6586x_gpio->gpio_chip.can_sleep = true; |
| |
| /* FIXME: add handling of GPIOs as dedicated inputs */ |
| tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output; |
| tps6586x_gpio->gpio_chip.set = tps6586x_gpio_set; |
| tps6586x_gpio->gpio_chip.get = tps6586x_gpio_get; |
| tps6586x_gpio->gpio_chip.to_irq = tps6586x_gpio_to_irq; |
| |
| #ifdef CONFIG_OF_GPIO |
| tps6586x_gpio->gpio_chip.of_node = pdev->dev.parent->of_node; |
| #endif |
| if (pdata && pdata->gpio_base) |
| tps6586x_gpio->gpio_chip.base = pdata->gpio_base; |
| else |
| tps6586x_gpio->gpio_chip.base = -1; |
| |
| ret = devm_gpiochip_add_data(&pdev->dev, &tps6586x_gpio->gpio_chip, |
| tps6586x_gpio); |
| if (ret < 0) { |
| dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); |
| return ret; |
| } |
| |
| platform_set_drvdata(pdev, tps6586x_gpio); |
| |
| return ret; |
| } |
| |
| static struct platform_driver tps6586x_gpio_driver = { |
| .driver.name = "tps6586x-gpio", |
| .probe = tps6586x_gpio_probe, |
| }; |
| |
| static int __init tps6586x_gpio_init(void) |
| { |
| return platform_driver_register(&tps6586x_gpio_driver); |
| } |
| subsys_initcall(tps6586x_gpio_init); |