LXR linux/drivers/gpio/gpio-tps6586x.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * TI TPS6586x GPIO driver
   4 *
   5 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   6 * Author: Laxman dewangan <ldewangan@nvidia.com>
   7 *
   8 * Based on tps6586x.c
   9 * Copyright (c) 2010 CompuLab Ltd.
  10 * Mike Rapoport <mike@compulab.co.il>
  11 */
  12
  13#include <linux/errno.h>
  14#include <linux/gpio/driver.h>
  15#include <linux/kernel.h>
  16#include <linux/init.h>
  17#include <linux/mfd/tps6586x.h>
  18#include <linux/of_device.h>
  19#include <linux/platform_device.h>
  20
  21/* GPIO control registers */
  22#define TPS6586X_GPIOSET1       0x5d
  23#define TPS6586X_GPIOSET2       0x5e
  24
  25struct tps6586x_gpio {
  26        struct gpio_chip gpio_chip;
  27        struct device *parent;
  28};
  29
  30static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
  31{
  32        struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
  33        uint8_t val;
  34        int ret;
  35
  36        ret = tps6586x_read(tps6586x_gpio->parent, TPS6586X_GPIOSET2, &val);
  37        if (ret)
  38                return ret;
  39
  40        return !!(val & (1 << offset));
  41}
  42
  43static void tps6586x_gpio_set(struct gpio_chip *gc, unsigned offset,
  44                              int value)
  45{
  46        struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
  47
  48        tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET2,
  49                        value << offset, 1 << offset);
  50}
  51
  52static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
  53                                int value)
  54{
  55        struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
  56        uint8_t val, mask;
  57
  58        tps6586x_gpio_set(gc, offset, value);
  59
  60        val = 0x1 << (offset * 2);
  61        mask = 0x3 << (offset * 2);
  62
  63        return tps6586x_update(tps6586x_gpio->parent, TPS6586X_GPIOSET1,
  64                                val, mask);
  65}
  66
  67static int tps6586x_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
  68{
  69        struct tps6586x_gpio *tps6586x_gpio = gpiochip_get_data(gc);
  70
  71        return tps6586x_irq_get_virq(tps6586x_gpio->parent,
  72                                TPS6586X_INT_PLDO_0 + offset);
  73}
  74
  75static int tps6586x_gpio_probe(struct platform_device *pdev)
  76{
  77        struct tps6586x_platform_data *pdata;
  78        struct tps6586x_gpio *tps6586x_gpio;
  79
  80        pdata = dev_get_platdata(pdev->dev.parent);
  81        tps6586x_gpio = devm_kzalloc(&pdev->dev,
  82                                sizeof(*tps6586x_gpio), GFP_KERNEL);
  83        if (!tps6586x_gpio)
  84                return -ENOMEM;
  85
  86        tps6586x_gpio->parent = pdev->dev.parent;
  87
  88        tps6586x_gpio->gpio_chip.owner = THIS_MODULE;
  89        tps6586x_gpio->gpio_chip.label = pdev->name;
  90        tps6586x_gpio->gpio_chip.parent = &pdev->dev;
  91        tps6586x_gpio->gpio_chip.ngpio = 4;
  92        tps6586x_gpio->gpio_chip.can_sleep = true;
  93
  94        /* FIXME: add handling of GPIOs as dedicated inputs */
  95        tps6586x_gpio->gpio_chip.direction_output = tps6586x_gpio_output;
  96        tps6586x_gpio->gpio_chip.set    = tps6586x_gpio_set;
  97        tps6586x_gpio->gpio_chip.get    = tps6586x_gpio_get;
  98        tps6586x_gpio->gpio_chip.to_irq = tps6586x_gpio_to_irq;
  99
 100#ifdef CONFIG_OF_GPIO
 101        tps6586x_gpio->gpio_chip.of_node = pdev->dev.parent->of_node;
 102#endif
 103        if (pdata && pdata->gpio_base)
 104                tps6586x_gpio->gpio_chip.base = pdata->gpio_base;
 105        else
 106                tps6586x_gpio->gpio_chip.base = -1;
 107
 108        return devm_gpiochip_add_data(&pdev->dev, &tps6586x_gpio->gpio_chip,
 109                                      tps6586x_gpio);
 110}
 111
 112static struct platform_driver tps6586x_gpio_driver = {
 113        .driver.name    = "tps6586x-gpio",
 114        .probe          = tps6586x_gpio_probe,
 115};
 116
 117static int __init tps6586x_gpio_init(void)
 118{
 119        return platform_driver_register(&tps6586x_gpio_driver);
 120}
 121subsys_initcall(tps6586x_gpio_init);
 122