pt., 1 lut 2019 o 10:48 Bartosz Golaszewski <brgl@xxxxxxxx> napisał(a):
>
> From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
>
> Add GPIO support for max77650 mfd device. This PMIC exposes a single
> GPIO line.
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
> ---
> 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@xxxxxxxxxxxx>
> +//
> +// 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@xxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL v2");
> --
> 2.20.1
>
I forgot to collect the tag, but Linus left his Reviewed-by:.
Bart
