// SPDX-License-Identifier: GPL-2.0-only
/*
* Analog Devices ADP5585 GPIO driver
*
* Copyright 2022 NXP
* Copyright 2024 Ideas on Board Oy
*/
#include <linux/device.h>
#include <linux/gpio/driver.h>
#include <linux/mfd/adp5585.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/types.h>
#define ADP5585_GPIO_MAX 11
struct adp5585_gpio_dev {
struct gpio_chip gpio_chip;
struct regmap *regmap;
};
static int adp5585_gpio_get_direction(struct gpio_chip *chip, unsigned int off)
{
struct adp5585_gpio_dev *adp5585_gpio = gpiochip_get_data(chip);
unsigned int bank = ADP5585_BANK(off);
unsigned int bit = ADP5585_BIT(off);
unsigned int val;
regmap_read(adp5585_gpio->regmap, ADP5585_GPIO_DIRECTION_A + bank, &val);
return val & bit ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN;
}
static int adp5585_gpio_direction_input(struct gpio_chip *chip, unsigned int off)
{
struct adp5585_gpio_dev *adp5585_gpio = gpiochip_get_data(chip);
unsigned int bank = ADP5585_BANK(off);
unsigned int bit = ADP5585_BIT(off);
return regmap_clear_bits(adp5585_gpio->regmap,
ADP5585_GPIO_DIRECTION_A + bank, bit);
}
static int adp5585_gpio_direction_output(struct gpio_chip *chip, unsigned int off, int val)
{
struct adp5585_gpio_dev *adp5585_gpio = gpiochip_get_data(chip);
unsigned int bank = ADP5585_BANK(off);
unsigned int bit = ADP5585_BIT(off);
int ret;
ret = regmap_update_bits(adp5585_gpio->regmap,
ADP5585_GPO_DATA_OUT_A + bank, bit,
val ? bit : 0);
if (ret)
return ret;
return regmap_set_bits(adp5585_gpio->regmap,
ADP5585_GPIO_DIRECTION_A + bank, bit);
}
static int adp5585_gpio_get_value(struct gpio_chip *chip, unsigned int off)
{
struct adp5585_gpio_dev *adp5585_gpio = gpiochip_get_data(chip);
unsigned int bank = ADP5585_BANK(off);
unsigned int bit = ADP5585_BIT(off);
unsigned int reg;
unsigned int val;
/*
* The input status register doesn't reflect the pin state when the
* GPIO is configured as an output. Check the direction, and read the
* input status from GPI_STATUS or output value from GPO_DATA_OUT
* accordingly.
*
* We don't need any locking, as concurrent access to the same GPIO
* isn't allowed by the GPIO API, so there's no risk of the
* .direction_input(), .direction_output() or .set() operations racing
* with this.
*/
regmap_read(adp5585_gpio->regmap, ADP5585_GPIO_DIRECTION_A + bank, &val);
reg = val & bit ? ADP5585_GPO_DATA_OUT_A : ADP5585_GPI_STATUS_A;
regmap_read(adp5585_gpio->regmap, reg + bank, &val);
return !!(val & bit);
}
static void adp5585_gpio_set_value(struct gpio_chip *chip, unsigned int off, int val)
{
struct adp5585_gpio_dev *adp5585_gpio = gpiochip_get_data(chip);
unsigned int bank = ADP5585_BANK(off);
unsigned int bit = ADP5585_BIT(off);
regmap_update_bits(adp5585_gpio->regmap, ADP5585_GPO_DATA_OUT_A + bank,
bit, val ? bit : 0);
}
static int adp5585_gpio_set_bias(struct adp5585_gpio_dev *adp5585_gpio,
unsigned int off, unsigned int bias)
{
unsigned int bit, reg, mask, val;
/*
* The bias configuration fields are 2 bits wide and laid down in
* consecutive registers ADP5585_RPULL_CONFIG_*, with a hole of 4 bits
* after R5.
*/
bit = off * 2 + (off > 5 ? 4 : 0);
reg = ADP5585_RPULL_CONFIG_A + bit / 8;
mask = ADP5585_Rx_PULL_CFG_MASK << (bit % 8);
val = bias << (bit % 8);
return regmap_update_bits(adp5585_gpio->regmap, reg, mask, val);
}
static int adp5585_gpio_set_drive(struct adp5585_gpio_dev *adp5585_gpio,
unsigned int off, enum pin_config_param drive)
{
unsigned int bank = ADP5585_BANK(off);
unsigned int bit = ADP5585_BIT(off);
return regmap_update_bits(adp5585_gpio->regmap,
ADP5585_GPO_OUT_MODE_A + bank, bit,
drive == PIN_CONFIG_DRIVE_OPEN_DRAIN ? bit : 0);
}
static int adp5585_gpio_set_debounce(struct adp5585_gpio_dev *adp5585_gpio,
unsigned int off, unsigned int debounce)
{
unsigned int bank = ADP5585_BANK(off);
unsigned int bit = ADP5585_BIT(off);
return regmap_update_bits(adp5585_gpio->regmap,
ADP5585_DEBOUNCE_DIS_A + bank, bit,
debounce ? 0 : bit);
}
static int adp5585_gpio_set_config(struct gpio_chip *chip, unsigned int off,
unsigned long config)
{
struct adp5585_gpio_dev *adp5585_gpio = gpiochip_get_data(chip);
enum pin_config_param param = pinconf_to_config_param(config);
u32 arg = pinconf_to_config_argument(config);
switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
return adp5585_gpio_set_bias(adp5585_gpio, off,
ADP5585_Rx_PULL_CFG_DISABLE);
case PIN_CONFIG_BIAS_PULL_DOWN:
return adp5585_gpio_set_bias(adp5585_gpio, off, arg ?
ADP5585_Rx_PULL_CFG_PD_300K :
ADP5585_Rx_PULL_CFG_DISABLE);
case PIN_CONFIG_BIAS_PULL_UP:
return adp5585_gpio_set_bias(adp5585_gpio, off, arg ?
ADP5585_Rx_PULL_CFG_PU_300K :
ADP5585_Rx_PULL_CFG_DISABLE);
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
case PIN_CONFIG_DRIVE_PUSH_PULL:
return adp5585_gpio_set_drive(adp5585_gpio, off, param);
case PIN_CONFIG_INPUT_DEBOUNCE:
return adp5585_gpio_set_debounce(adp5585_gpio, off, arg);
default:
return -ENOTSUPP;
};
}
static int adp5585_gpio_probe(struct platform_device *pdev)
{
struct adp5585_dev *adp5585 = dev_get_drvdata(pdev->dev.parent);
struct adp5585_gpio_dev *adp5585_gpio;
struct device *dev = &pdev->dev;
struct gpio_chip *gc;
int ret;
adp5585_gpio = devm_kzalloc(dev, sizeof(*adp5585_gpio), GFP_KERNEL);
if (!adp5585_gpio)
return -ENOMEM;
adp5585_gpio->regmap = adp5585->regmap;
device_set_of_node_from_dev(dev, dev->parent);
gc = &adp5585_gpio->gpio_chip;
gc->parent = dev;
gc->get_direction = adp5585_gpio_get_direction;
gc->direction_input = adp5585_gpio_direction_input;
gc->direction_output = adp5585_gpio_direction_output;
gc->get = adp5585_gpio_get_value;
gc->set = adp5585_gpio_set_value;
gc->set_config = adp5585_gpio_set_config;
gc->can_sleep = true;
gc->base = -1;
gc->ngpio = ADP5585_GPIO_MAX;
gc->label = pdev->name;
gc->owner = THIS_MODULE;
ret = devm_gpiochip_add_data(dev, &adp5585_gpio->gpio_chip,
adp5585_gpio);
if (ret)
return dev_err_probe(dev, ret, "failed to add GPIO chip\n");
return 0;
}
static const struct platform_device_id adp5585_gpio_id_table[] = {
{ "adp5585-gpio" },
{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(platform, adp5585_gpio_id_table);
static struct platform_driver adp5585_gpio_driver = {
.driver = {
.name = "adp5585-gpio",
},
.probe = adp5585_gpio_probe,
.id_table = adp5585_gpio_id_table,
};
module_platform_driver(adp5585_gpio_driver);
MODULE_AUTHOR("Haibo Chen <[email protected]>");
MODULE_DESCRIPTION("GPIO ADP5585 Driver");
MODULE_LICENSE("GPL");
Codebase Browser
linux