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    Subject[PATCH v3 08/11] gpio: max77650: add GPIO support
    Date
    From: Bartosz Golaszewski <bgolaszewski@baylibre.com>

    Add GPIO support for max77650 mfd device. This PMIC exposes a single
    GPIO line.

    Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
    ---
    drivers/gpio/Kconfig | 7 ++
    drivers/gpio/Makefile | 1 +
    drivers/gpio/gpio-max77650.c | 189 +++++++++++++++++++++++++++++++++++
    3 files changed, 197 insertions(+)
    create mode 100644 drivers/gpio/gpio-max77650.c

    diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
    index b5a2845347ec..fb297fe5bfec 100644
    --- a/drivers/gpio/Kconfig
    +++ b/drivers/gpio/Kconfig
    @@ -1095,6 +1095,13 @@ config GPIO_MAX77620
    driver also provides interrupt support for each of the gpios.
    Say yes here to enable the max77620 to be used as gpio controller.

    +config GPIO_MAX77650
    + tristate "Maxim MAX77650/77651 GPIO support"
    + depends on MFD_MAX77650
    + help
    + GPIO driver for MAX77650/77651 PMIC from Maxim Semiconductor.
    + These chips have a single pin that can be configured as GPIO.
    +
    config GPIO_MSIC
    bool "Intel MSIC mixed signal gpio support"
    depends on (X86 || COMPILE_TEST) && MFD_INTEL_MSIC
    diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
    index 37628f8dbf70..8bdad50db822 100644
    --- a/drivers/gpio/Makefile
    +++ b/drivers/gpio/Makefile
    @@ -78,6 +78,7 @@ obj-$(CONFIG_GPIO_MAX7300) += gpio-max7300.o
    obj-$(CONFIG_GPIO_MAX7301) += gpio-max7301.o
    obj-$(CONFIG_GPIO_MAX732X) += gpio-max732x.o
    obj-$(CONFIG_GPIO_MAX77620) += gpio-max77620.o
    +obj-$(CONFIG_GPIO_MAX77650) += gpio-max77650.o
    obj-$(CONFIG_GPIO_MB86S7X) += gpio-mb86s7x.o
    obj-$(CONFIG_GPIO_MENZ127) += gpio-menz127.o
    obj-$(CONFIG_GPIO_MERRIFIELD) += gpio-merrifield.o
    diff --git a/drivers/gpio/gpio-max77650.c b/drivers/gpio/gpio-max77650.c
    new file mode 100644
    index 000000000000..8382dd85c548
    --- /dev/null
    +++ b/drivers/gpio/gpio-max77650.c
    @@ -0,0 +1,189 @@
    +// SPDX-License-Identifier: GPL-2.0
    +//
    +// Copyright (C) 2018 BayLibre SAS
    +// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
    +//
    +// GPIO driver for MAXIM 77650/77651 charger/power-supply.
    +
    +#include <linux/gpio/driver.h>
    +#include <linux/i2c.h>
    +#include <linux/mfd/max77650.h>
    +#include <linux/module.h>
    +#include <linux/platform_device.h>
    +#include <linux/regmap.h>
    +
    +#define MAX77650_GPIO_DIR_MASK BIT(0)
    +#define MAX77650_GPIO_INVAL_MASK BIT(1)
    +#define MAX77650_GPIO_DRV_MASK BIT(2)
    +#define MAX77650_GPIO_OUTVAL_MASK BIT(3)
    +#define MAX77650_GPIO_DEBOUNCE_MASK BIT(4)
    +
    +#define MAX77650_GPIO_DIR_OUT 0x00
    +#define MAX77650_GPIO_DIR_IN BIT(0)
    +#define MAX77650_GPIO_OUT_LOW 0x00
    +#define MAX77650_GPIO_OUT_HIGH BIT(3)
    +#define MAX77650_GPIO_DRV_OPEN_DRAIN 0x00
    +#define MAX77650_GPIO_DRV_PUSH_PULL BIT(2)
    +#define MAX77650_GPIO_DEBOUNCE BIT(4)
    +
    +#define MAX77650_GPIO_DIR_BITS(_reg) \
    + ((_reg) & MAX77650_GPIO_DIR_MASK)
    +#define MAX77650_GPIO_INVAL_BITS(_reg) \
    + (((_reg) & MAX77650_GPIO_INVAL_MASK) >> 1)
    +
    +struct max77650_gpio_chip {
    + struct regmap *map;
    + struct gpio_chip gc;
    +};
    +
    +static int max77650_gpio_direction_input(struct gpio_chip *gc,
    + unsigned int offset)
    +{
    + struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
    +
    + return regmap_update_bits(chip->map,
    + MAX77650_REG_CNFG_GPIO,
    + MAX77650_GPIO_DIR_MASK,
    + MAX77650_GPIO_DIR_IN);
    +}
    +
    +static int max77650_gpio_direction_output(struct gpio_chip *gc,
    + unsigned int offset, int value)
    +{
    + struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
    + int mask, regval;
    +
    + mask = MAX77650_GPIO_DIR_MASK | MAX77650_GPIO_OUTVAL_MASK;
    + regval = value ? MAX77650_GPIO_OUT_HIGH : MAX77650_GPIO_OUT_LOW;
    + regval |= MAX77650_GPIO_DIR_OUT;
    +
    + return regmap_update_bits(chip->map,
    + MAX77650_REG_CNFG_GPIO, mask, regval);
    +}
    +
    +static void max77650_gpio_set_value(struct gpio_chip *gc,
    + unsigned int offset, int value)
    +{
    + struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
    + int rv, regval;
    +
    + regval = value ? MAX77650_GPIO_OUT_HIGH : MAX77650_GPIO_OUT_LOW;
    +
    + rv = regmap_update_bits(chip->map, MAX77650_REG_CNFG_GPIO,
    + MAX77650_GPIO_OUTVAL_MASK, regval);
    + if (rv)
    + dev_err(gc->parent, "cannot set GPIO value: %d\n", rv);
    +}
    +
    +static int max77650_gpio_get_value(struct gpio_chip *gc,
    + unsigned int offset)
    +{
    + struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
    + unsigned int val;
    + int rv;
    +
    + rv = regmap_read(chip->map, MAX77650_REG_CNFG_GPIO, &val);
    + if (rv)
    + return rv;
    +
    + return MAX77650_GPIO_INVAL_BITS(val);
    +}
    +
    +static int max77650_gpio_get_direction(struct gpio_chip *gc,
    + unsigned int offset)
    +{
    + struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
    + unsigned int val;
    + int rv;
    +
    + rv = regmap_read(chip->map, MAX77650_REG_CNFG_GPIO, &val);
    + if (rv)
    + return rv;
    +
    + return MAX77650_GPIO_DIR_BITS(val);
    +}
    +
    +static int max77650_gpio_set_config(struct gpio_chip *gc,
    + unsigned int offset, unsigned long cfg)
    +{
    + struct max77650_gpio_chip *chip = gpiochip_get_data(gc);
    +
    + switch (pinconf_to_config_param(cfg)) {
    + case PIN_CONFIG_DRIVE_OPEN_DRAIN:
    + return regmap_update_bits(chip->map,
    + MAX77650_REG_CNFG_GPIO,
    + MAX77650_GPIO_DRV_MASK,
    + MAX77650_GPIO_DRV_OPEN_DRAIN);
    + case PIN_CONFIG_DRIVE_PUSH_PULL:
    + return regmap_update_bits(chip->map,
    + MAX77650_REG_CNFG_GPIO,
    + MAX77650_GPIO_DRV_MASK,
    + MAX77650_GPIO_DRV_PUSH_PULL);
    + case PIN_CONFIG_INPUT_DEBOUNCE:
    + return regmap_update_bits(chip->map,
    + MAX77650_REG_CNFG_GPIO,
    + MAX77650_GPIO_DEBOUNCE_MASK,
    + MAX77650_GPIO_DEBOUNCE);
    + default:
    + return -ENOTSUPP;
    + }
    +}
    +
    +static int max77650_gpio_to_irq(struct gpio_chip *gc, unsigned int offset)
    +{
    + /*
    + * TODO Add interrupt support.
    + *
    + * We first need to properly support hierarchical irqs in gpiolib
    + * and regmap irq_chip.
    + */
    + return -EOPNOTSUPP;
    +}
    +
    +static int max77650_gpio_probe(struct platform_device *pdev)
    +{
    + struct max77650_gpio_chip *chip;
    + struct device *dev, *parent;
    + struct i2c_client *i2c;
    +
    + dev = &pdev->dev;
    + parent = dev->parent;
    + i2c = to_i2c_client(parent);
    +
    + chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
    + if (!chip)
    + return -ENOMEM;
    +
    + chip->map = dev_get_regmap(parent, NULL);
    + if (!chip->map)
    + return -ENODEV;
    +
    + chip->gc.base = -1;
    + chip->gc.ngpio = 1;
    + chip->gc.label = i2c->name;
    + chip->gc.parent = dev;
    + chip->gc.owner = THIS_MODULE;
    + chip->gc.can_sleep = true;
    +
    + chip->gc.direction_input = max77650_gpio_direction_input;
    + chip->gc.direction_output = max77650_gpio_direction_output;
    + chip->gc.set = max77650_gpio_set_value;
    + chip->gc.get = max77650_gpio_get_value;
    + chip->gc.get_direction = max77650_gpio_get_direction;
    + chip->gc.set_config = max77650_gpio_set_config;
    + chip->gc.to_irq = max77650_gpio_to_irq;
    +
    + return devm_gpiochip_add_data(dev, &chip->gc, chip);
    +}
    +
    +static struct platform_driver max77650_gpio_driver = {
    + .driver = {
    + .name = "max77650-gpio",
    + },
    + .probe = max77650_gpio_probe,
    +};
    +module_platform_driver(max77650_gpio_driver);
    +
    +MODULE_DESCRIPTION("MAXIM 77650/77651 GPIO driver");
    +MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
    +MODULE_LICENSE("GPL v2");
    --
    2.20.1
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