LXR linux/drivers/gpio/gpio-adp5520.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * GPIO driver for Analog Devices ADP5520 MFD PMICs
   4 *
   5 * Copyright 2009 Analog Devices Inc.
   6 */
   7
   8#include <linux/module.h>
   9#include <linux/slab.h>
  10#include <linux/kernel.h>
  11#include <linux/init.h>
  12#include <linux/platform_device.h>
  13#include <linux/mfd/adp5520.h>
  14#include <linux/gpio/driver.h>
  15
  16struct adp5520_gpio {
  17        struct device *master;
  18        struct gpio_chip gpio_chip;
  19        unsigned char lut[ADP5520_MAXGPIOS];
  20        unsigned long output;
  21};
  22
  23static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off)
  24{
  25        struct adp5520_gpio *dev;
  26        uint8_t reg_val;
  27
  28        dev = gpiochip_get_data(chip);
  29
  30        /*
  31         * There are dedicated registers for GPIO IN/OUT.
  32         * Make sure we return the right value, even when configured as output
  33         */
  34
  35        if (test_bit(off, &dev->output))
  36                adp5520_read(dev->master, ADP5520_GPIO_OUT, &reg_val);
  37        else
  38                adp5520_read(dev->master, ADP5520_GPIO_IN, &reg_val);
  39
  40        return !!(reg_val & dev->lut[off]);
  41}
  42
  43static void adp5520_gpio_set_value(struct gpio_chip *chip,
  44                unsigned off, int val)
  45{
  46        struct adp5520_gpio *dev;
  47        dev = gpiochip_get_data(chip);
  48
  49        if (val)
  50                adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
  51        else
  52                adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
  53}
  54
  55static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off)
  56{
  57        struct adp5520_gpio *dev;
  58        dev = gpiochip_get_data(chip);
  59
  60        clear_bit(off, &dev->output);
  61
  62        return adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_2,
  63                                dev->lut[off]);
  64}
  65
  66static int adp5520_gpio_direction_output(struct gpio_chip *chip,
  67                unsigned off, int val)
  68{
  69        struct adp5520_gpio *dev;
  70        int ret = 0;
  71        dev = gpiochip_get_data(chip);
  72
  73        set_bit(off, &dev->output);
  74
  75        if (val)
  76                ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_OUT,
  77                                        dev->lut[off]);
  78        else
  79                ret |= adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT,
  80                                        dev->lut[off]);
  81
  82        ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_2,
  83                                        dev->lut[off]);
  84
  85        return ret;
  86}
  87
  88static int adp5520_gpio_probe(struct platform_device *pdev)
  89{
  90        struct adp5520_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
  91        struct adp5520_gpio *dev;
  92        struct gpio_chip *gc;
  93        int ret, i, gpios;
  94        unsigned char ctl_mask = 0;
  95
  96        if (pdata == NULL) {
  97                dev_err(&pdev->dev, "missing platform data\n");
  98                return -ENODEV;
  99        }
 100
 101        if (pdev->id != ID_ADP5520) {
 102                dev_err(&pdev->dev, "only ADP5520 supports GPIO\n");
 103                return -ENODEV;
 104        }
 105
 106        dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 107        if (dev == NULL)
 108                return -ENOMEM;
 109
 110        dev->master = pdev->dev.parent;
 111
 112        for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++)
 113                if (pdata->gpio_en_mask & (1 << i))
 114                        dev->lut[gpios++] = 1 << i;
 115
 116        if (gpios < 1)
 117                return -EINVAL;
 118
 119        gc = &dev->gpio_chip;
 120        gc->direction_input  = adp5520_gpio_direction_input;
 121        gc->direction_output = adp5520_gpio_direction_output;
 122        gc->get = adp5520_gpio_get_value;
 123        gc->set = adp5520_gpio_set_value;
 124        gc->can_sleep = true;
 125
 126        gc->base = pdata->gpio_start;
 127        gc->ngpio = gpios;
 128        gc->label = pdev->name;
 129        gc->owner = THIS_MODULE;
 130
 131        ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1,
 132                pdata->gpio_en_mask);
 133
 134        if (pdata->gpio_en_mask & ADP5520_GPIO_C3)
 135                ctl_mask |= ADP5520_C3_MODE;
 136
 137        if (pdata->gpio_en_mask & ADP5520_GPIO_R3)
 138                ctl_mask |= ADP5520_R3_MODE;
 139
 140        if (ctl_mask)
 141                ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
 142                        ctl_mask);
 143
 144        ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
 145                pdata->gpio_pullup_mask);
 146
 147        if (ret) {
 148                dev_err(&pdev->dev, "failed to write\n");
 149                return ret;
 150        }
 151
 152        return devm_gpiochip_add_data(&pdev->dev, &dev->gpio_chip, dev);
 153}
 154
 155static struct platform_driver adp5520_gpio_driver = {
 156        .driver = {
 157                .name   = "adp5520-gpio",
 158        },
 159        .probe          = adp5520_gpio_probe,
 160};
 161
 162module_platform_driver(adp5520_gpio_driver);
 163
 164MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 165MODULE_DESCRIPTION("GPIO ADP5520 Driver");
 166MODULE_LICENSE("GPL");
 167MODULE_ALIAS("platform:adp5520-gpio");
 168