drivers/gpio/gpio-palmas.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * TI Palma series PMIC's GPIO driver.
   4  *
   5  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   6  *
   7  * Author: Laxman Dewangan <ldewangan@nvidia.com>
   8  */
   9
  10 #include <linux/gpio/driver.h>
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/mfd/palmas.h>
  14 #include <linux/of.h>
  15 #include <linux/of_device.h>
  16 #include <linux/platform_device.h>
  17
  18 struct palmas_gpio {
  19         struct gpio_chip gpio_chip;
  20         struct palmas *palmas;
  21 };
  22
  23 struct palmas_device_data {
  24         int ngpio;
  25 };
  26
  27 static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
  28 {
  29         struct palmas_gpio *pg = gpiochip_get_data(gc);
  30         struct palmas *palmas = pg->palmas;
  31         unsigned int val;
  32         int ret;
  33         unsigned int reg;
  34         int gpio16 = (offset/8);
  35
  36         offset %= 8;
  37         reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
  38
  39         ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
  40         if (ret < 0) {
  41                 dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
  42                 return ret;
  43         }
  44
  45         if (val & BIT(offset))
  46                 reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
  47         else
  48                 reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;
  49
  50         ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
  51         if (ret < 0) {
  52                 dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
  53                 return ret;
  54         }
  55         return !!(val & BIT(offset));
  56 }
  57
  58 static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
  59                         int value)
  60 {
  61         struct palmas_gpio *pg = gpiochip_get_data(gc);
  62         struct palmas *palmas = pg->palmas;
  63         int ret;
  64         unsigned int reg;
  65         int gpio16 = (offset/8);
  66
  67         offset %= 8;
  68         if (gpio16)
  69                 reg = (value) ?
  70                         PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
  71         else
  72                 reg = (value) ?
  73                         PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;
  74
  75         ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
  76         if (ret < 0)
  77                 dev_err(gc->parent, "Reg 0x%02x write failed, %d\n", reg, ret);
  78 }
  79
  80 static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
  81                                 int value)
  82 {
  83         struct palmas_gpio *pg = gpiochip_get_data(gc);
  84         struct palmas *palmas = pg->palmas;
  85         int ret;
  86         unsigned int reg;
  87         int gpio16 = (offset/8);
  88
  89         offset %= 8;
  90         reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
  91
  92         /* Set the initial value */
  93         palmas_gpio_set(gc, offset, value);
  94
  95         ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
  96                                 BIT(offset), BIT(offset));
  97         if (ret < 0)
  98                 dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
  99                         ret);
 100         return ret;
 101 }
 102
 103 static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
 104 {
 105         struct palmas_gpio *pg = gpiochip_get_data(gc);
 106         struct palmas *palmas = pg->palmas;
 107         int ret;
 108         unsigned int reg;
 109         int gpio16 = (offset/8);
 110
 111         offset %= 8;
 112         reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;
 113
 114         ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
 115         if (ret < 0)
 116                 dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
 117                         ret);
 118         return ret;
 119 }
 120
 121 static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
 122 {
 123         struct palmas_gpio *pg = gpiochip_get_data(gc);
 124         struct palmas *palmas = pg->palmas;
 125
 126         return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
 127 }
 128
 129 static const struct palmas_device_data palmas_dev_data = {
 130         .ngpio = 8,
 131 };
 132
 133 static const struct palmas_device_data tps80036_dev_data = {
 134         .ngpio = 16,
 135 };
 136
 137 static const struct of_device_id of_palmas_gpio_match[] = {
 138         { .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
 139         { .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
 140         { .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
 141         { .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
 142         { },
 143 };
 144
 145 static int palmas_gpio_probe(struct platform_device *pdev)
 146 {
 147         struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
 148         struct palmas_platform_data *palmas_pdata;
 149         struct palmas_gpio *palmas_gpio;
 150         int ret;
 151         const struct palmas_device_data *dev_data;
 152
 153         dev_data = of_device_get_match_data(&pdev->dev);
 154         if (!dev_data)
 155                 dev_data = &palmas_dev_data;
 156
 157         palmas_gpio = devm_kzalloc(&pdev->dev,
 158                                 sizeof(*palmas_gpio), GFP_KERNEL);
 159         if (!palmas_gpio)
 160                 return -ENOMEM;
 161
 162         palmas_gpio->palmas = palmas;
 163         palmas_gpio->gpio_chip.owner = THIS_MODULE;
 164         palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
 165         palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
 166         palmas_gpio->gpio_chip.can_sleep = true;
 167         palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
 168         palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
 169         palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
 170         palmas_gpio->gpio_chip.set      = palmas_gpio_set;
 171         palmas_gpio->gpio_chip.get      = palmas_gpio_get;
 172         palmas_gpio->gpio_chip.parent = &pdev->dev;
 173 #ifdef CONFIG_OF_GPIO
 174         palmas_gpio->gpio_chip.of_node = pdev->dev.of_node;
 175 #endif
 176         palmas_pdata = dev_get_platdata(palmas->dev);
 177         if (palmas_pdata && palmas_pdata->gpio_base)
 178                 palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
 179         else
 180                 palmas_gpio->gpio_chip.base = -1;
 181
 182         ret = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip,
 183                                      palmas_gpio);
 184         if (ret < 0) {
 185                 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
 186                 return ret;
 187         }
 188
 189         platform_set_drvdata(pdev, palmas_gpio);
 190         return ret;
 191 }
 192
 193 static struct platform_driver palmas_gpio_driver = {
 194         .driver.name    = "palmas-gpio",
 195         .driver.of_match_table = of_palmas_gpio_match,
 196         .probe          = palmas_gpio_probe,
 197 };
 198
 199 static int __init palmas_gpio_init(void)
 200 {
 201         return platform_driver_register(&palmas_gpio_driver);
 202 }
 203 subsys_initcall(palmas_gpio_init);