LXR linux/drivers/gpio/gpio-tps68470.c

   1/*
   2 * GPIO driver for TPS68470 PMIC
   3 *
   4 * Copyright (C) 2017 Intel Corporation
   5 *
   6 * Authors:
   7 *      Antti Laakso <antti.laakso@intel.com>
   8 *      Tianshu Qiu <tian.shu.qiu@intel.com>
   9 *      Jian Xu Zheng <jian.xu.zheng@intel.com>
  10 *      Yuning Pu <yuning.pu@intel.com>
  11 *
  12 * This program is free software; you can redistribute it and/or
  13 * modify it under the terms of the GNU General Public License as
  14 * published by the Free Software Foundation version 2.
  15 *
  16 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  17 * kind, whether express or implied; without even the implied warranty
  18 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 */
  21
  22#include <linux/gpio/driver.h>
  23#include <linux/mfd/tps68470.h>
  24#include <linux/module.h>
  25#include <linux/platform_device.h>
  26#include <linux/regmap.h>
  27
  28#define TPS68470_N_LOGIC_OUTPUT 3
  29#define TPS68470_N_REGULAR_GPIO 7
  30#define TPS68470_N_GPIO (TPS68470_N_LOGIC_OUTPUT + TPS68470_N_REGULAR_GPIO)
  31
  32struct tps68470_gpio_data {
  33        struct regmap *tps68470_regmap;
  34        struct gpio_chip gc;
  35};
  36
  37static int tps68470_gpio_get(struct gpio_chip *gc, unsigned int offset)
  38{
  39        struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
  40        struct regmap *regmap = tps68470_gpio->tps68470_regmap;
  41        unsigned int reg = TPS68470_REG_GPDO;
  42        int val, ret;
  43
  44        if (offset >= TPS68470_N_REGULAR_GPIO) {
  45                offset -= TPS68470_N_REGULAR_GPIO;
  46                reg = TPS68470_REG_SGPO;
  47        }
  48
  49        ret = regmap_read(regmap, reg, &val);
  50        if (ret) {
  51                dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
  52                        TPS68470_REG_SGPO);
  53                return ret;
  54        }
  55        return !!(val & BIT(offset));
  56}
  57
  58/* Return 0 if output, 1 if input */
  59static int tps68470_gpio_get_direction(struct gpio_chip *gc,
  60                                       unsigned int offset)
  61{
  62        struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
  63        struct regmap *regmap = tps68470_gpio->tps68470_regmap;
  64        int val, ret;
  65
  66        /* rest are always outputs */
  67        if (offset >= TPS68470_N_REGULAR_GPIO)
  68                return 0;
  69
  70        ret = regmap_read(regmap, TPS68470_GPIO_CTL_REG_A(offset), &val);
  71        if (ret) {
  72                dev_err(tps68470_gpio->gc.parent, "reg 0x%x read failed\n",
  73                        TPS68470_GPIO_CTL_REG_A(offset));
  74                return ret;
  75        }
  76
  77        val &= TPS68470_GPIO_MODE_MASK;
  78        return val >= TPS68470_GPIO_MODE_OUT_CMOS ? 0 : 1;
  79}
  80
  81static void tps68470_gpio_set(struct gpio_chip *gc, unsigned int offset,
  82                                int value)
  83{
  84        struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
  85        struct regmap *regmap = tps68470_gpio->tps68470_regmap;
  86        unsigned int reg = TPS68470_REG_GPDO;
  87
  88        if (offset >= TPS68470_N_REGULAR_GPIO) {
  89                reg = TPS68470_REG_SGPO;
  90                offset -= TPS68470_N_REGULAR_GPIO;
  91        }
  92
  93        regmap_update_bits(regmap, reg, BIT(offset), value ? BIT(offset) : 0);
  94}
  95
  96static int tps68470_gpio_output(struct gpio_chip *gc, unsigned int offset,
  97                                int value)
  98{
  99        struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
 100        struct regmap *regmap = tps68470_gpio->tps68470_regmap;
 101
 102        /* rest are always outputs */
 103        if (offset >= TPS68470_N_REGULAR_GPIO)
 104                return 0;
 105
 106        /* Set the initial value */
 107        tps68470_gpio_set(gc, offset, value);
 108
 109        return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
 110                                 TPS68470_GPIO_MODE_MASK,
 111                                 TPS68470_GPIO_MODE_OUT_CMOS);
 112}
 113
 114static int tps68470_gpio_input(struct gpio_chip *gc, unsigned int offset)
 115{
 116        struct tps68470_gpio_data *tps68470_gpio = gpiochip_get_data(gc);
 117        struct regmap *regmap = tps68470_gpio->tps68470_regmap;
 118
 119        /* rest are always outputs */
 120        if (offset >= TPS68470_N_REGULAR_GPIO)
 121                return -EINVAL;
 122
 123        return regmap_update_bits(regmap, TPS68470_GPIO_CTL_REG_A(offset),
 124                                   TPS68470_GPIO_MODE_MASK, 0x00);
 125}
 126
 127static const char *tps68470_names[TPS68470_N_GPIO] = {
 128        "gpio.0", "gpio.1", "gpio.2", "gpio.3",
 129        "gpio.4", "gpio.5", "gpio.6",
 130        "s_enable", "s_idle", "s_resetn",
 131};
 132
 133static int tps68470_gpio_probe(struct platform_device *pdev)
 134{
 135        struct tps68470_gpio_data *tps68470_gpio;
 136        int ret;
 137
 138        tps68470_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps68470_gpio),
 139                                     GFP_KERNEL);
 140        if (!tps68470_gpio)
 141                return -ENOMEM;
 142
 143        tps68470_gpio->tps68470_regmap = dev_get_drvdata(pdev->dev.parent);
 144        tps68470_gpio->gc.label = "tps68470-gpio";
 145        tps68470_gpio->gc.owner = THIS_MODULE;
 146        tps68470_gpio->gc.direction_input = tps68470_gpio_input;
 147        tps68470_gpio->gc.direction_output = tps68470_gpio_output;
 148        tps68470_gpio->gc.get = tps68470_gpio_get;
 149        tps68470_gpio->gc.get_direction = tps68470_gpio_get_direction;
 150        tps68470_gpio->gc.set = tps68470_gpio_set;
 151        tps68470_gpio->gc.can_sleep = true;
 152        tps68470_gpio->gc.names = tps68470_names;
 153        tps68470_gpio->gc.ngpio = TPS68470_N_GPIO;
 154        tps68470_gpio->gc.base = -1;
 155        tps68470_gpio->gc.parent = &pdev->dev;
 156
 157        ret = devm_gpiochip_add_data(&pdev->dev, &tps68470_gpio->gc,
 158                                     tps68470_gpio);
 159        if (ret < 0) {
 160                dev_err(&pdev->dev, "Failed to register gpio_chip: %d\n", ret);
 161                return ret;
 162        }
 163
 164        platform_set_drvdata(pdev, tps68470_gpio);
 165
 166        return ret;
 167}
 168
 169static struct platform_driver tps68470_gpio_driver = {
 170        .driver = {
 171                   .name = "tps68470-gpio",
 172        },
 173        .probe = tps68470_gpio_probe,
 174};
 175
 176builtin_platform_driver(tps68470_gpio_driver)
 177