drivers/gpio/gpio-tps68470.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * GPIO driver for TPS68470 PMIC
   4  *
   5  * Copyright (C) 2017 Intel Corporation
   6  *
   7  * Authors:
   8  *      Antti Laakso <antti.laakso@intel.com>
   9  *      Tianshu Qiu <tian.shu.qiu@intel.com>
  10  *      Jian Xu Zheng <jian.xu.zheng@intel.com>
  11  *      Yuning Pu <yuning.pu@intel.com>
  12  */
  13
  14 #include <linux/gpio/driver.h>
  15 #include <linux/mfd/tps68470.h>
  16 #include <linux/module.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regmap.h>
  19
  20 #define TPS68470_N_LOGIC_OUTPUT 3
  21 #define TPS68470_N_REGULAR_GPIO 7
  22 #define TPS68470_N_GPIO (TPS68470_N_LOGIC_OUTPUT + TPS68470_N_REGULAR_GPIO)
  23
  24 struct tps68470_gpio_data {
  25         struct regmap *tps68470_regmap;
  26         struct gpio_chip gc;
  27 };
  28
  29 static int tps68470_gpio_get(struct gpio_chip *gc, unsigned int offset)
  30 {
  31         struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
  32         struct regmap *regmap = tps68470_gpio->tps68470_regmap;
  33         unsigned int reg = TPS68470_REG_GPDO;
  34         int val, ret;
  35
  36         if (offset >= TPS68470_N_REGULAR_GPIO) {
  37                 offset -= TPS68470_N_REGULAR_GPIO;
  38                 reg = TPS68470_REG_SGPO;
  39         }
  40
  41         ret = regmap_read(regmap, reg, &val);
  42         if (ret) {
  43                 dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
  44                         TPS68470_REG_SGPO);
  45                 return ret;
  46         }
  47         return !!(val & BIT(offset));
  48 }
  49
  50 /* Return 0 if output, 1 if input */
  51 static int tps68470_gpio_get_direction(struct gpio_chip *gc,
  52                                        unsigned int offset)
  53 {
  54         struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
  55         struct regmap *regmap = tps68470_gpio->tps68470_regmap;
  56         int val, ret;
  57
  58         /* rest are always outputs */
  59         if (offset >= TPS68470_N_REGULAR_GPIO)
  60                 return 0;
  61
  62         ret = regmap_read(regmap, TPS68470_GPIO_CTL_REG_A(offset), &val);
  63         if (ret) {
  64                 dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
  65                         TPS68470_GPIO_CTL_REG_A(offset));
  66                 return ret;
  67         }
  68
  69         val &= TPS68470_GPIO_MODE_MASK;
  70         return val >= TPS68470_GPIO_MODE_OUT_CMOS ? 0 : 1;
  71 }
  72
  73 static void tps68470_gpio_set(struct gpio_chip *gc, unsigned int offset,
  74                                 int value)
  75 {
  76         struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
  77         struct regmap *regmap = tps68470_gpio->tps68470_regmap;
  78         unsigned int reg = TPS68470_REG_GPDO;
  79
  80         if (offset >= TPS68470_N_REGULAR_GPIO) {
  81                 reg = TPS68470_REG_SGPO;
  82                 offset -= TPS68470_N_REGULAR_GPIO;
  83         }
  84
  85         regmap_update_bits(regmap, reg, BIT(offset), value ? BIT(offset) : 0);
  86 }
  87
  88 static int tps68470_gpio_output(struct gpio_chip *gc, unsigned int offset,
  89                                 int value)
  90 {
  91         struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
  92         struct regmap *regmap = tps68470_gpio->tps68470_regmap;
  93
  94         /* rest are always outputs */
  95         if (offset >= TPS68470_N_REGULAR_GPIO)
  96                 return 0;
  97
  98         /* Set the initial value */
  99         tps68470_gpio_set(gc, offset, value);
 100
 101         return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
 102                                  TPS68470_GPIO_MODE_MASK,
 103                                  TPS68470_GPIO_MODE_OUT_CMOS);
 104 }
 105
 106 static int tps68470_gpio_input(struct gpio_chip *gc, unsigned int offset)
 107 {
 108         struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
 109         struct regmap *regmap = tps68470_gpio->tps68470_regmap;
 110
 111         /* rest are always outputs */
 112         if (offset >= TPS68470_N_REGULAR_GPIO)
 113                 return -EINVAL;
 114
 115         return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
 116                                    TPS68470_GPIO_MODE_MASK, 0x00);
 117 }
 118
 119 static const char *tps68470_names[TPS68470_N_GPIO] = {
 120         "gpio.0", "gpio.1", "gpio.2", "gpio.3",
 121         "gpio.4", "gpio.5", "gpio.6",
 122         "s_enable", "s_idle", "s_resetn",
 123 };
 124
 125 static int tps68470_gpio_probe(struct platform_device *pdev)
 126 {
 127         struct tps68470_gpio_data *tps68470_gpio;
 128         int ret;
 129
 130         tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio),
 131                                      GFP_KERNEL);
 132         if (!tps68470_gpio)
 133                 return -ENOMEM;
 134
 135         tps68470_gpio->tps68470_regmap = dev_get_drvdata(pdev->dev.parent);
 136         tps68470_gpio->gc.label = "tps68470-gpio";
 137         tps68470_gpio->gc.owner = THIS_MODULE;
 138         tps68470_gpio->gc.direction_input = tps68470_gpio_input;
 139         tps68470_gpio->gc.direction_output = tps68470_gpio_output;
 140         tps68470_gpio->gc.get = tps68470_gpio_get;
 141         tps68470_gpio->gc.get_direction = tps68470_gpio_get_direction;
 142         tps68470_gpio->gc.set = tps68470_gpio_set;
 143         tps68470_gpio->gc.can_sleep = true;
 144         tps68470_gpio->gc.names = tps68470_names;
 145         tps68470_gpio->gc.ngpio = TPS68470_N_GPIO;
 146         tps68470_gpio->gc.base = -1;
 147         tps68470_gpio->gc.parent = &pdev->dev;
 148
 149         ret = devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc,
 150                                      tps68470_gpio);
 151         if (ret < 0) {
 152                 dev_err(&pdev->dev, "Failed to register gpio_chip: %d\n", ret);
 153                 return ret;
 154         }
 155
 156         platform_set_drvdata(pdev, tps68470_gpio);
 157
 158         return ret;
 159 }
 160
 161 static struct platform_driver tps68470_gpio_driver = {
 162         .driver = {
 163                    .name = "tps68470-gpio",
 164         },
 165         .probe = tps68470_gpio_probe,
 166 };
 167
 168 builtin_platform_driver(tps68470_gpio_driver)