drivers/gpio/gpio-tps6586x.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * TI TPS6586x GPIO driver
0004  *
0005  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
0006  * Author: Laxman dewangan <ldewangan@nvidia.com>
0007  *
0008  * Based on tps6586x.c
0009  * Copyright (c) 2010 CompuLab Ltd.
0010  * Mike Rapoport <mike@compulab.co.il>
0011  */
0012
0013 #include <linux/errno.h>
0014 #include <linux/gpio/driver.h>
0015 #include <linux/kernel.h>
0016 #include <linux/init.h>
0017 #include <linux/mfd/tps6586x.h>
0018 #include <linux/of_device.h>
0019 #include <linux/platform_device.h>
0020
0021 /* GPIO control registers */
0022 #define TPS6586X_GPIOSET1   0x5d
0023 #define TPS6586X_GPIOSET2   0x5e
0024
0025 struct tps6586x_gpio {
0026     struct gpio_chip gpio_chip;
0027     struct device *parent;
0028 };
0029
0030 static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
0031 {
0032     struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
0033     uint8_t val;
0034     int ret;
0035
0036     ret = tps6586x_read(tps6586x_gpio->parent, TPS6586X_GPIOSET2, &val);
0037     if (ret)
0038         return ret;
0039
0040     return !!(val & (1 << offset));
0041 }
0042
0043 static void tps6586x_gpio_set(struct gpio_chip *gc, unsigned offset,
0044                   int value)
0045 {
0046     struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
0047
0048     tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2,
0049             value << offset, 1 << offset);
0050 }
0051
0052 static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
0053                 int value)
0054 {
0055     struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
0056     uint8_t val, mask;
0057
0058     tps6586x_gpio_set(gc, offset, value);
0059
0060     val = 0x1 << (offset * 2);
0061     mask = 0x3 << (offset * 2);
0062
0063     return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1,
0064                 val, mask);
0065 }
0066
0067 static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
0068 {
0069     struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
0070
0071     return tps6586x_irq_get_virq(tps6586x_gpio->parent,
0072                 TPS6586X_INT_PLDO_0 + offset);
0073 }
0074
0075 static int tps6586x_gpio_probe(struct platform_device *pdev)
0076 {
0077     struct tps6586x_platform_data *pdata;
0078     struct tps6586x_gpio *tps6586x_gpio;
0079
0080     device_set_node(&pdev->dev, dev_fwnode(pdev->dev.parent));
0081
0082     pdata = dev_get_platdata(pdev->dev.parent);
0083     tps6586x_gpio = devm_kzalloc(&pdev->dev,
0084                 sizeof(*tps6586x_gpio), GFP_KERNEL);
0085     if (!tps6586x_gpio)
0086         return -ENOMEM;
0087
0088     tps6586x_gpio->parent = pdev->dev.parent;
0089
0090     tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
0091     tps6586x_gpio->gpio_chip.label = pdev->name;
0092     tps6586x_gpio->gpio_chip.parent = &pdev->dev;
0093     tps6586x_gpio->gpio_chip.ngpio = 4;
0094     tps6586x_gpio->gpio_chip.can_sleep = true;
0095
0096     /* FIXME: add handling of GPIOs as dedicated inputs */
0097     tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output;
0098     tps6586x_gpio->gpio_chip.set    = tps6586x_gpio_set;
0099     tps6586x_gpio->gpio_chip.get    = tps6586x_gpio_get;
0100     tps6586x_gpio->gpio_chip.to_irq = tps6586x_gpio_to_irq;
0101
0102     if (pdata && pdata->gpio_base)
0103         tps6586x_gpio->gpio_chip.base = pdata->gpio_base;
0104     else
0105         tps6586x_gpio->gpio_chip.base = -1;
0106
0107     return devm_gpiochip_add_data(&pdev->dev, &tps6586x_gpio->gpio_chip,
0108                       tps6586x_gpio);
0109 }
0110
0111 static struct platform_driver tps6586x_gpio_driver = {
0112     .driver.name    = "tps6586x-gpio",
0113     .probe      = tps6586x_gpio_probe,
0114 };
0115
0116 static int __init tps6586x_gpio_init(void)
0117 {
0118     return platform_driver_register(&tps6586x_gpio_driver);
0119 }
0120 subsys_initcall(tps6586x_gpio_init);