gpio: Initial support for ROHM bd70528 GPIO block

ROHM BD70528 PMIC has 4 GPIO pins. Allow them to be
controlled by GPIO framework.

IRQs are handled by regmap-irq and GPIO driver is not
aware of the irq usage.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

3 files changed, 244 insertions, 0 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 8023d03ec362..87dbbd03910d 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -977,6 +977,17 @@ config GPIO_ARIZONA
         help
           Support for GPIOs on Wolfson Arizona class devices.
 
+config GPIO_BD70528
+        tristate "ROHM BD70528 GPIO support"
+        depends on MFD_ROHM_BD70528
+        help
+          Support for GPIOs on ROHM BD70528 PMIC. There are four GPIOs
+          available on the ROHM PMIC in total. The GPIOs can also
+          generate interrupts.
+
+          This driver can also be built as a module. If so, the module
+          will be called gpio-bd70528.
+
 config GPIO_BD9571MWV
         tristate "ROHM BD9571 GPIO support"
         depends on MFD_BD9571MWV
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 6700eee860b7..10efc4f743fe 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -35,6 +35,7 @@ obj-$(CONFIG_GPIO_ATH79)	+= gpio-ath79.o
 obj-$(CONFIG_GPIO_ASPEED)       += gpio-aspeed.o
 obj-$(CONFIG_GPIO_RASPBERRYPI_EXP)      += gpio-raspberrypi-exp.o
 obj-$(CONFIG_GPIO_BCM_KONA)     += gpio-bcm-kona.o
+obj-$(CONFIG_GPIO_BD70528)      += gpio-bd70528.o
 obj-$(CONFIG_GPIO_BD9571MWV)    += gpio-bd9571mwv.o
 obj-$(CONFIG_GPIO_BRCMSTB)      += gpio-brcmstb.o
 obj-$(CONFIG_GPIO_BT8XX)        += gpio-bt8xx.o
diff --git a/drivers/gpio/gpio-bd70528.c b/drivers/gpio/gpio-bd70528.c
new file mode 100644
index 000000000000..fd85605d2dab
--- /dev/null
+++ b/drivers/gpio/gpio-bd70528.c
@@ -0,0 +1,232 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 ROHM Semiconductors
+// gpio-bd70528.c ROHM BD70528MWV gpio driver
+
+#include <linux/gpio/driver.h>
+#include <linux/mfd/rohm-bd70528.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define GPIO_IN_REG(offset) (BD70528_REG_GPIO1_IN + (offset) * 2)
+#define GPIO_OUT_REG(offset) (BD70528_REG_GPIO1_OUT + (offset) * 2)
+
+struct bd70528_gpio {
+        struct rohm_regmap_dev chip;
+        struct gpio_chip gpio;
+};
+
+static int bd70528_set_debounce(struct bd70528_gpio *bdgpio,
+                                unsigned int offset, unsigned int debounce)
+{
+        u8 val;
+
+        switch (debounce) {
+        case 0:
+                val = BD70528_DEBOUNCE_DISABLE;
+                break;
+        case 1 ... 15:
+                val = BD70528_DEBOUNCE_15MS;
+                break;
+        case 16 ... 30:
+                val = BD70528_DEBOUNCE_30MS;
+                break;
+        case 31 ... 50:
+                val = BD70528_DEBOUNCE_50MS;
+                break;
+        default:
+                dev_err(bdgpio->chip.dev,
+                        "Invalid debouce value %u\n", debounce);
+                return -EINVAL;
+        }
+        return regmap_update_bits(bdgpio->chip.regmap, GPIO_IN_REG(offset),
+                                 BD70528_DEBOUNCE_MASK, val);
+}
+
+static int bd70528_get_direction(struct gpio_chip *chip, unsigned int offset)
+{
+        struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
+        int val, ret;
+
+        /* Do we need to do something to IRQs here? */
+        ret = regmap_read(bdgpio->chip.regmap, GPIO_OUT_REG(offset), &val);
+        if (ret) {
+                dev_err(bdgpio->chip.dev, "Could not read gpio direction\n");
+                return ret;
+        }
+
+        return !(val & BD70528_GPIO_OUT_EN_MASK);
+}
+
+static int bd70528_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
+                                   unsigned long config)
+{
+        struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
+
+        switch (pinconf_to_config_param(config)) {
+        case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+                return regmap_update_bits(bdgpio->chip.regmap,
+                                          GPIO_OUT_REG(offset),
+                                          BD70528_GPIO_DRIVE_MASK,
+                                          BD70528_GPIO_OPEN_DRAIN);
+                break;
+        case PIN_CONFIG_DRIVE_PUSH_PULL:
+                return regmap_update_bits(bdgpio->chip.regmap,
+                                          GPIO_OUT_REG(offset),
+                                          BD70528_GPIO_DRIVE_MASK,
+                                          BD70528_GPIO_PUSH_PULL);
+                break;
+        case PIN_CONFIG_INPUT_DEBOUNCE:
+                return bd70528_set_debounce(bdgpio, offset,
+                                            pinconf_to_config_argument(config));
+                break;
+        default:
+                break;
+        }
+        return -ENOTSUPP;
+}
+
+static int bd70528_direction_input(struct gpio_chip *chip, unsigned int offset)
+{
+        struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
+
+        /* Do we need to do something to IRQs here? */
+        return regmap_update_bits(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
+                                 BD70528_GPIO_OUT_EN_MASK,
+                                 BD70528_GPIO_OUT_DISABLE);
+}
+
+static void bd70528_gpio_set(struct gpio_chip *chip, unsigned int offset,
+                             int value)
+{
+        int ret;
+        struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
+        u8 val = (value) ? BD70528_GPIO_OUT_HI : BD70528_GPIO_OUT_LO;
+
+        ret = regmap_update_bits(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
+                                 BD70528_GPIO_OUT_MASK, val);
+        if (ret)
+                dev_err(bdgpio->chip.dev, "Could not set gpio to %d\n", value);
+}
+
+static int bd70528_direction_output(struct gpio_chip *chip, unsigned int offset,
+                                    int value)
+{
+        struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
+
+        bd70528_gpio_set(chip, offset, value);
+        return regmap_update_bits(bdgpio->chip.regmap, GPIO_OUT_REG(offset),
+                                 BD70528_GPIO_OUT_EN_MASK,
+                                 BD70528_GPIO_OUT_ENABLE);
+}
+
+#define GPIO_IN_STATE_MASK(offset) (BD70528_GPIO_IN_STATE_BASE << (offset))
+
+static int bd70528_gpio_get_o(struct bd70528_gpio *bdgpio, unsigned int offset)
+{
+        int ret;
+        unsigned int val;
+
+        ret = regmap_read(bdgpio->chip.regmap, GPIO_OUT_REG(offset), &val);
+        if (!ret)
+                ret = !!(val & BD70528_GPIO_OUT_MASK);
+        else
+                dev_err(bdgpio->chip.dev, "GPIO (out) state read failed\n");
+
+        return ret;
+}
+
+static int bd70528_gpio_get_i(struct bd70528_gpio *bdgpio, unsigned int offset)
+{
+        unsigned int val;
+        int ret;
+
+        ret = regmap_read(bdgpio->chip.regmap, BD70528_REG_GPIO_STATE, &val);
+
+        if (!ret)
+                ret = !(val & GPIO_IN_STATE_MASK(offset));
+        else
+                dev_err(bdgpio->chip.dev, "GPIO (in) state read failed\n");
+
+        return ret;
+}
+
+static int bd70528_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+        int ret = -EINVAL;
+        struct bd70528_gpio *bdgpio = gpiochip_get_data(chip);
+
+        /*
+         * There is a race condition where someone might be changing the
+         * GPIO direction after we get it but before we read the value. But
+         * application design where GPIO direction may be changed just when
+         * we read GPIO value would be pointless as reader could not know
+         * whether the returned high/low state is caused by input or output.
+         * Or then there must be other ways to mitigate the issue. Thus
+         * locking would make no sense.
+         */
+        ret = bd70528_get_direction(chip, offset);
+        if (ret == 0)
+                ret = bd70528_gpio_get_o(bdgpio, offset);
+        else if (ret == 1)
+                ret = bd70528_gpio_get_i(bdgpio, offset);
+        else
+                dev_err(bdgpio->chip.dev, "failed to read GPIO direction\n");
+
+        return ret;
+}
+
+static int bd70528_probe(struct platform_device *pdev)
+{
+        struct bd70528_gpio *bdgpio;
+        struct rohm_regmap_dev *bd70528;
+        int ret;
+
+        bd70528 = dev_get_drvdata(pdev->dev.parent);
+        if (!bd70528) {
+                dev_err(&pdev->dev, "No MFD driver data\n");
+                return -EINVAL;
+        }
+
+        bdgpio = devm_kzalloc(&pdev->dev, sizeof(*bdgpio),
+                              GFP_KERNEL);
+        if (!bdgpio)
+                return -ENOMEM;
+        bdgpio->chip.dev = &pdev->dev;
+        bdgpio->gpio.parent = pdev->dev.parent;
+        bdgpio->gpio.label = "bd70528-gpio";
+        bdgpio->gpio.owner = THIS_MODULE;
+        bdgpio->gpio.get_direction = bd70528_get_direction;
+        bdgpio->gpio.direction_input = bd70528_direction_input;
+        bdgpio->gpio.direction_output = bd70528_direction_output;
+        bdgpio->gpio.set_config = bd70528_gpio_set_config;
+        bdgpio->gpio.can_sleep = true;
+        bdgpio->gpio.get = bd70528_gpio_get;
+        bdgpio->gpio.set = bd70528_gpio_set;
+        bdgpio->gpio.ngpio = 4;
+        bdgpio->gpio.base = -1;
+#ifdef CONFIG_OF_GPIO
+        bdgpio->gpio.of_node = pdev->dev.parent->of_node;
+#endif
+        bdgpio->chip.regmap = bd70528->regmap;
+
+        ret = devm_gpiochip_add_data(&pdev->dev, &bdgpio->gpio,
+                                     bdgpio);
+        if (ret)
+                dev_err(&pdev->dev, "gpio_init: Failed to add bd70528-gpio\n");
+
+        return ret;
+}
+
+static struct platform_driver bd70528_gpio = {
+        .driver = {
+                .name = "bd70528-gpio"
+        },
+        .probe = bd70528_probe,
+};
+
+module_platform_driver(bd70528_gpio);
+
+MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
+MODULE_DESCRIPTION("BD70528 voltage regulator driver");
+MODULE_LICENSE("GPL");