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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * GPIO driver for Analog Devices ADP5520 MFD PMICs4 *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 output33 */34 35 if (test_bit(off, &dev->output))36 adp5520_read(dev->master, ADP5520_GPIO_OUT, ®_val);37 else38 adp5520_read(dev->master, ADP5520_GPIO_IN, ®_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 else52 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 else79 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