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path: root/drivers/gpio/gpio-bd9571mwv.c
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Diffstat (limited to 'drivers/gpio/gpio-bd9571mwv.c')
-rw-r--r--drivers/gpio/gpio-bd9571mwv.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-bd9571mwv.c b/drivers/gpio/gpio-bd9571mwv.c
new file mode 100644
index 000000000..9a4d55f70
--- /dev/null
+++ b/drivers/gpio/gpio-bd9571mwv.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ROHM BD9571MWV-M and BD9574MWF-M GPIO driver
+ *
+ * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com>
+ *
+ * Based on the TPS65086 driver
+ *
+ * NOTE: Interrupts are not supported yet.
+ */
+
+#include <linux/gpio/driver.h>
+#include <linux/mfd/rohm-generic.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <linux/mfd/bd9571mwv.h>
+
+struct bd9571mwv_gpio {
+ struct regmap *regmap;
+ struct gpio_chip chip;
+};
+
+static int bd9571mwv_gpio_get_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
+ int ret, val;
+
+ ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_DIR, &val);
+ if (ret < 0)
+ return ret;
+ if (val & BIT(offset))
+ return GPIO_LINE_DIRECTION_IN;
+
+ return GPIO_LINE_DIRECTION_OUT;
+}
+
+static int bd9571mwv_gpio_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
+
+ regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR, BIT(offset), 0);
+
+ return 0;
+}
+
+static int bd9571mwv_gpio_direction_output(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
+
+ /* Set the initial value */
+ regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
+ BIT(offset), value ? BIT(offset) : 0);
+ regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_DIR,
+ BIT(offset), BIT(offset));
+
+ return 0;
+}
+
+static int bd9571mwv_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
+ int ret, val;
+
+ ret = regmap_read(gpio->regmap, BD9571MWV_GPIO_IN, &val);
+ if (ret < 0)
+ return ret;
+
+ return val & BIT(offset);
+}
+
+static void bd9571mwv_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ struct bd9571mwv_gpio *gpio = gpiochip_get_data(chip);
+
+ regmap_update_bits(gpio->regmap, BD9571MWV_GPIO_OUT,
+ BIT(offset), value ? BIT(offset) : 0);
+}
+
+static const struct gpio_chip template_chip = {
+ .label = "bd9571mwv-gpio",
+ .owner = THIS_MODULE,
+ .get_direction = bd9571mwv_gpio_get_direction,
+ .direction_input = bd9571mwv_gpio_direction_input,
+ .direction_output = bd9571mwv_gpio_direction_output,
+ .get = bd9571mwv_gpio_get,
+ .set = bd9571mwv_gpio_set,
+ .base = -1,
+ .ngpio = 2,
+ .can_sleep = true,
+};
+
+static int bd9571mwv_gpio_probe(struct platform_device *pdev)
+{
+ struct bd9571mwv_gpio *gpio;
+
+ gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ gpio->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ gpio->chip = template_chip;
+ gpio->chip.parent = pdev->dev.parent;
+
+ return devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
+}
+
+static const struct platform_device_id bd9571mwv_gpio_id_table[] = {
+ { "bd9571mwv-gpio", ROHM_CHIP_TYPE_BD9571 },
+ { "bd9574mwf-gpio", ROHM_CHIP_TYPE_BD9574 },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, bd9571mwv_gpio_id_table);
+
+static struct platform_driver bd9571mwv_gpio_driver = {
+ .driver = {
+ .name = "bd9571mwv-gpio",
+ },
+ .probe = bd9571mwv_gpio_probe,
+ .id_table = bd9571mwv_gpio_id_table,
+};
+module_platform_driver(bd9571mwv_gpio_driver);
+
+MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>");
+MODULE_DESCRIPTION("BD9571MWV GPIO driver");
+MODULE_LICENSE("GPL v2");