drivers/gpio/gpio-da9055.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * GPIO Driver for Dialog DA9055 PMICs.
   4  *
   5  * Copyright(c) 2012 Dialog Semiconductor Ltd.
   6  *
   7  * Author: David Dajun Chen <dchen@diasemi.com>
   8  */
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/gpio/driver.h>
  12
  13 #include <linux/mfd/da9055/core.h>
  14 #include <linux/mfd/da9055/reg.h>
  15 #include <linux/mfd/da9055/pdata.h>
  16
  17 #define DA9055_VDD_IO                   0x0
  18 #define DA9055_PUSH_PULL                0x3
  19 #define DA9055_ACT_LOW                  0x0
  20 #define DA9055_GPI                      0x1
  21 #define DA9055_PORT_MASK                0x3
  22 #define DA9055_PORT_SHIFT(offset)       (4 * (offset % 2))
  23
  24 #define DA9055_INPUT                    DA9055_GPI
  25 #define DA9055_OUTPUT                   DA9055_PUSH_PULL
  26 #define DA9055_IRQ_GPI0                 3
  27
  28 struct da9055_gpio {
  29         struct da9055 *da9055;
  30         struct gpio_chip gp;
  31 };
  32
  33 static int da9055_gpio_get(struct gpio_chip *gc, unsigned offset)
  34 {
  35         struct da9055_gpio *gpio = gpiochip_get_data(gc);
  36         int gpio_direction = 0;
  37         int ret;
  38
  39         /* Get GPIO direction */
  40         ret = da9055_reg_read(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1);
  41         if (ret < 0)
  42                 return ret;
  43
  44         gpio_direction = ret & (DA9055_PORT_MASK) << DA9055_PORT_SHIFT(offset);
  45         gpio_direction >>= DA9055_PORT_SHIFT(offset);
  46         switch (gpio_direction) {
  47         case DA9055_INPUT:
  48                 ret = da9055_reg_read(gpio->da9055, DA9055_REG_STATUS_B);
  49                 if (ret < 0)
  50                         return ret;
  51                 break;
  52         case DA9055_OUTPUT:
  53                 ret = da9055_reg_read(gpio->da9055, DA9055_REG_GPIO_MODE0_2);
  54                 if (ret < 0)
  55                         return ret;
  56         }
  57
  58         return ret & (1 << offset);
  59
  60 }
  61
  62 static void da9055_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
  63 {
  64         struct da9055_gpio *gpio = gpiochip_get_data(gc);
  65
  66         da9055_reg_update(gpio->da9055,
  67                         DA9055_REG_GPIO_MODE0_2,
  68                         1 << offset,
  69                         value << offset);
  70 }
  71
  72 static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
  73 {
  74         struct da9055_gpio *gpio = gpiochip_get_data(gc);
  75         unsigned char reg_byte;
  76
  77         reg_byte = (DA9055_ACT_LOW | DA9055_GPI)
  78                                 << DA9055_PORT_SHIFT(offset);
  79
  80         return da9055_reg_update(gpio->da9055, (offset >> 1) +
  81                                 DA9055_REG_GPIO0_1,
  82                                 DA9055_PORT_MASK <<
  83                                 DA9055_PORT_SHIFT(offset),
  84                                 reg_byte);
  85 }
  86
  87 static int da9055_gpio_direction_output(struct gpio_chip *gc,
  88                                         unsigned offset, int value)
  89 {
  90         struct da9055_gpio *gpio = gpiochip_get_data(gc);
  91         unsigned char reg_byte;
  92         int ret;
  93
  94         reg_byte = (DA9055_VDD_IO | DA9055_PUSH_PULL)
  95                                         << DA9055_PORT_SHIFT(offset);
  96
  97         ret = da9055_reg_update(gpio->da9055, (offset >> 1) +
  98                                 DA9055_REG_GPIO0_1,
  99                                 DA9055_PORT_MASK <<
 100                                 DA9055_PORT_SHIFT(offset),
 101                                 reg_byte);
 102         if (ret < 0)
 103                 return ret;
 104
 105         da9055_gpio_set(gc, offset, value);
 106
 107         return 0;
 108 }
 109
 110 static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset)
 111 {
 112         struct da9055_gpio *gpio = gpiochip_get_data(gc);
 113         struct da9055 *da9055 = gpio->da9055;
 114
 115         return regmap_irq_get_virq(da9055->irq_data,
 116                                   DA9055_IRQ_GPI0 + offset);
 117 }
 118
 119 static const struct gpio_chip reference_gp = {
 120         .label = "da9055-gpio",
 121         .owner = THIS_MODULE,
 122         .get = da9055_gpio_get,
 123         .set = da9055_gpio_set,
 124         .direction_input = da9055_gpio_direction_input,
 125         .direction_output = da9055_gpio_direction_output,
 126         .to_irq = da9055_gpio_to_irq,
 127         .can_sleep = true,
 128         .ngpio = 3,
 129         .base = -1,
 130 };
 131
 132 static int da9055_gpio_probe(struct platform_device *pdev)
 133 {
 134         struct da9055_gpio *gpio;
 135         struct da9055_pdata *pdata;
 136         int ret;
 137
 138         gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
 139         if (!gpio)
 140                 return -ENOMEM;
 141
 142         gpio->da9055 = dev_get_drvdata(pdev->dev.parent);
 143         pdata = dev_get_platdata(gpio->da9055->dev);
 144
 145         gpio->gp = reference_gp;
 146         if (pdata && pdata->gpio_base)
 147                 gpio->gp.base = pdata->gpio_base;
 148
 149         ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
 150         if (ret < 0) {
 151                 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
 152                 return ret;
 153         }
 154
 155         platform_set_drvdata(pdev, gpio);
 156
 157         return 0;
 158 }
 159
 160 static struct platform_driver da9055_gpio_driver = {
 161         .probe = da9055_gpio_probe,
 162         .driver = {
 163                 .name   = "da9055-gpio",
 164         },
 165 };
 166
 167 static int __init da9055_gpio_init(void)
 168 {
 169         return platform_driver_register(&da9055_gpio_driver);
 170 }
 171 subsys_initcall(da9055_gpio_init);
 172
 173 static void __exit da9055_gpio_exit(void)
 174 {
 175         platform_driver_unregister(&da9055_gpio_driver);
 176 }
 177 module_exit(da9055_gpio_exit);
 178
 179 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 180 MODULE_DESCRIPTION("DA9055 GPIO Device Driver");
 181 MODULE_LICENSE("GPL");
 182 MODULE_ALIAS("platform:da9055-gpio");