LXR linux/drivers/gpio/gpio-tps65912.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * GPIO driver for TI TPS65912x PMICs
   4 *
   5 * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
   6 *      Andrew F. Davis <afd@ti.com>
   7 *
   8 * Based on the Arizona GPIO driver and the previous TPS65912 driver by
   9 * Margarita Olaya Cabrera <magi@slimlogic.co.uk>
  10 */
  11
  12#include <linux/gpio/driver.h>
  13#include <linux/module.h>
  14#include <linux/platform_device.h>
  15
  16#include <linux/mfd/tps65912.h>
  17
  18struct tps65912_gpio {
  19        struct gpio_chip gpio_chip;
  20        struct tps65912 *tps;
  21};
  22
  23static int tps65912_gpio_get_direction(struct gpio_chip *gc,
  24                                       unsigned offset)
  25{
  26        struct tps65912_gpio *gpio = gpiochip_get_data(gc);
  27
  28        int ret, val;
  29
  30        ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
  31        if (ret)
  32                return ret;
  33
  34        if (val & GPIO_CFG_MASK)
  35                return 0;
  36        else
  37                return 1;
  38}
  39
  40static int tps65912_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
  41{
  42        struct tps65912_gpio *gpio = gpiochip_get_data(gc);
  43
  44        return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
  45                                  GPIO_CFG_MASK, 0);
  46}
  47
  48static int tps65912_gpio_direction_output(struct gpio_chip *gc,
  49                                          unsigned offset, int value)
  50{
  51        struct tps65912_gpio *gpio = gpiochip_get_data(gc);
  52
  53        /* Set the initial value */
  54        regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
  55                           GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
  56
  57        return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
  58                                  GPIO_CFG_MASK, GPIO_CFG_MASK);
  59}
  60
  61static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
  62{
  63        struct tps65912_gpio *gpio = gpiochip_get_data(gc);
  64        int ret, val;
  65
  66        ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
  67        if (ret)
  68                return ret;
  69
  70        if (val & GPIO_STS_MASK)
  71                return 1;
  72
  73        return 0;
  74}
  75
  76static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset,
  77                              int value)
  78{
  79        struct tps65912_gpio *gpio = gpiochip_get_data(gc);
  80
  81        regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
  82                           GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
  83}
  84
  85static const struct gpio_chip template_chip = {
  86        .label                  = "tps65912-gpio",
  87        .owner                  = THIS_MODULE,
  88        .get_direction          = tps65912_gpio_get_direction,
  89        .direction_input        = tps65912_gpio_direction_input,
  90        .direction_output       = tps65912_gpio_direction_output,
  91        .get                    = tps65912_gpio_get,
  92        .set                    = tps65912_gpio_set,
  93        .base                   = -1,
  94        .ngpio                  = 5,
  95        .can_sleep              = true,
  96};
  97
  98static int tps65912_gpio_probe(struct platform_device *pdev)
  99{
 100        struct tps65912 *tps = dev_get_drvdata(pdev->dev.parent);
 101        struct tps65912_gpio *gpio;
 102        int ret;
 103
 104        gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
 105        if (!gpio)
 106                return -ENOMEM;
 107
 108        gpio->tps = dev_get_drvdata(pdev->dev.parent);
 109        gpio->gpio_chip = template_chip;
 110        gpio->gpio_chip.parent = tps->dev;
 111
 112        ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gpio_chip,
 113                                     gpio);
 114        if (ret < 0) {
 115                dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
 116                return ret;
 117        }
 118
 119        platform_set_drvdata(pdev, gpio);
 120
 121        return 0;
 122}
 123
 124static const struct platform_device_id tps65912_gpio_id_table[] = {
 125        { "tps65912-gpio", },
 126        { /* sentinel */ }
 127};
 128MODULE_DEVICE_TABLE(platform, tps65912_gpio_id_table);
 129
 130static struct platform_driver tps65912_gpio_driver = {
 131        .driver = {
 132                .name = "tps65912-gpio",
 133        },
 134        .probe = tps65912_gpio_probe,
 135        .id_table = tps65912_gpio_id_table,
 136};
 137module_platform_driver(tps65912_gpio_driver);
 138
 139MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
 140MODULE_DESCRIPTION("TPS65912 GPIO driver");
 141MODULE_LICENSE("GPL v2");
 142