pinctrl: move gpio-axp209 to pinctrl

To prepare the driver for the upcoming pinctrl features, move the GPIO
driver AXP209 from GPIO to pinctrl subsystem.

Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 189 insertions, 0 deletions

diff --git a/drivers/pinctrl/pinctrl-axp209.c b/drivers/pinctrl/pinctrl-axp209.c
new file mode 100644
index 000000000000..6ee7dc1418fa
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-axp209.c
@@ -0,0 +1,189 @@
+/*
+ * AXP20x GPIO driver
+ *
+ * Copyright (C) 2016 Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under  the terms of the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mfd/axp20x.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define AXP20X_GPIO_FUNCTIONS           0x7
+#define AXP20X_GPIO_FUNCTION_OUT_LOW    0
+#define AXP20X_GPIO_FUNCTION_OUT_HIGH   1
+#define AXP20X_GPIO_FUNCTION_INPUT      2
+
+struct axp20x_gpio {
+        struct gpio_chip        chip;
+        struct regmap           *regmap;
+};
+
+static int axp20x_gpio_get_reg(unsigned int offset)
+{
+        switch (offset) {
+        case 0:
+                return AXP20X_GPIO0_CTRL;
+        case 1:
+                return AXP20X_GPIO1_CTRL;
+        case 2:
+                return AXP20X_GPIO2_CTRL;
+        }
+
+        return -EINVAL;
+}
+
+static int axp20x_gpio_input(struct gpio_chip *chip, unsigned int offset)
+{
+        struct axp20x_gpio *gpio = gpiochip_get_data(chip);
+        int reg;
+
+        reg = axp20x_gpio_get_reg(offset);
+        if (reg < 0)
+                return reg;
+
+        return regmap_update_bits(gpio->regmap, reg,
+                                  AXP20X_GPIO_FUNCTIONS,
+                                  AXP20X_GPIO_FUNCTION_INPUT);
+}
+
+static int axp20x_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+        struct axp20x_gpio *gpio = gpiochip_get_data(chip);
+        unsigned int val;
+        int ret;
+
+        ret = regmap_read(gpio->regmap, AXP20X_GPIO20_SS, &val);
+        if (ret)
+                return ret;
+
+        return !!(val & BIT(offset + 4));
+}
+
+static int axp20x_gpio_get_direction(struct gpio_chip *chip,
+                                     unsigned int offset)
+{
+        struct axp20x_gpio *gpio = gpiochip_get_data(chip);
+        unsigned int val;
+        int reg, ret;
+
+        reg = axp20x_gpio_get_reg(offset);
+        if (reg < 0)
+                return reg;
+
+        ret = regmap_read(gpio->regmap, reg, &val);
+        if (ret)
+                return ret;
+
+        /*
+         * This shouldn't really happen if the pin is in use already,
+         * or if it's not in use yet, it doesn't matter since we're
+         * going to change the value soon anyway. Default to output.
+         */
+        if ((val & AXP20X_GPIO_FUNCTIONS) > 2)
+                return 0;
+
+        /*
+         * The GPIO directions are the three lowest values.
+         * 2 is input, 0 and 1 are output
+         */
+        return val & 2;
+}
+
+static int axp20x_gpio_output(struct gpio_chip *chip, unsigned int offset,
+                              int value)
+{
+        struct axp20x_gpio *gpio = gpiochip_get_data(chip);
+        int reg;
+
+        reg = axp20x_gpio_get_reg(offset);
+        if (reg < 0)
+                return reg;
+
+        return regmap_update_bits(gpio->regmap, reg,
+                                  AXP20X_GPIO_FUNCTIONS,
+                                  value ? AXP20X_GPIO_FUNCTION_OUT_HIGH
+                                  : AXP20X_GPIO_FUNCTION_OUT_LOW);
+}
+
+static void axp20x_gpio_set(struct gpio_chip *chip, unsigned int offset,
+                            int value)
+{
+        axp20x_gpio_output(chip, offset, value);
+}
+
+static int axp20x_gpio_probe(struct platform_device *pdev)
+{
+        struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
+        struct axp20x_gpio *gpio;
+        int ret;
+
+        if (!of_device_is_available(pdev->dev.of_node))
+                return -ENODEV;
+
+        if (!axp20x) {
+                dev_err(&pdev->dev, "Parent drvdata not set\n");
+                return -EINVAL;
+        }
+
+        gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+        if (!gpio)
+                return -ENOMEM;
+
+        gpio->chip.base                 = -1;
+        gpio->chip.can_sleep            = true;
+        gpio->chip.parent               = &pdev->dev;
+        gpio->chip.label                = dev_name(&pdev->dev);
+        gpio->chip.owner                = THIS_MODULE;
+        gpio->chip.get                  = axp20x_gpio_get;
+        gpio->chip.get_direction        = axp20x_gpio_get_direction;
+        gpio->chip.set                  = axp20x_gpio_set;
+        gpio->chip.direction_input      = axp20x_gpio_input;
+        gpio->chip.direction_output     = axp20x_gpio_output;
+        gpio->chip.ngpio                = 3;
+
+        gpio->regmap = axp20x->regmap;
+
+        ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
+        if (ret) {
+                dev_err(&pdev->dev, "Failed to register GPIO chip\n");
+                return ret;
+        }
+
+        dev_info(&pdev->dev, "AXP209 GPIO driver loaded\n");
+
+        return 0;
+}
+
+static const struct of_device_id axp20x_gpio_match[] = {
+        { .compatible = "x-powers,axp209-gpio" },
+        { }
+};
+MODULE_DEVICE_TABLE(of, axp20x_gpio_match);
+
+static struct platform_driver axp20x_gpio_driver = {
+        .probe          = axp20x_gpio_probe,
+        .driver = {
+                .name           = "axp20x-gpio",
+                .of_match_table = axp20x_gpio_match,
+        },
+};
+
+module_platform_driver(axp20x_gpio_driver);
+
+MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
+MODULE_DESCRIPTION("AXP20x PMIC GPIO driver");
+MODULE_LICENSE("GPL");