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
  18 struct tps65912_gpio {
  19         struct gpio_chip gpio_chip;
  20         struct tps65912 *tps;
  21 };
  22
  23 static 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 GPIO_LINE_DIRECTION_OUT;
  36         else
  37                 return GPIO_LINE_DIRECTION_IN;
  38 }
  39
  40 static 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
  48 static 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
  61 static 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
  76 static 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
  85 static 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
  98 static 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
 124 static const struct platform_device_id tps65912_gpio_id_table[] = {
 125         { "tps65912-gpio", },
 126         { /* sentinel */ }
 127 };
 128 MODULE_DEVICE_TABLE(platform, tps65912_gpio_id_table);
 129
 130 static 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 };
 137 module_platform_driver(tps65912_gpio_driver);
 138
 139 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
 140 MODULE_DESCRIPTION("TPS65912 GPIO driver");
 141 MODULE_LICENSE("GPL v2");