gpio: lp87565: Add support for GPIO
Add driver for lp87565 PMIC family GPIOs. Three GPIOs are supported
and can be configured in Open-drain output or Push-pull output.
Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpio-lp87565.c b/drivers/gpio/gpio-lp87565.c
new file mode 100644
index 0000000..6313c50
--- /dev/null
+++ b/drivers/gpio/gpio-lp87565.c
@@ -0,0 +1,190 @@
+/*
+ * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
+ * Keerthy <j-keerthy@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether expressed or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License version 2 for more details.
+ *
+ * Based on the LP873X driver
+ */
+
+#include <linux/gpio/driver.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/lp87565.h>
+
+struct lp87565_gpio {
+ struct gpio_chip chip;
+ struct regmap *map;
+};
+
+static int lp87565_gpio_get_direction(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ struct lp87565_gpio *gpio = gpiochip_get_data(chip);
+ int ret, val;
+
+ ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
+ if (ret < 0)
+ return ret;
+
+ return !(val & BIT(offset));
+}
+
+static int lp87565_gpio_direction_input(struct gpio_chip *chip,
+ unsigned int offset)
+{
+ struct lp87565_gpio *gpio = gpiochip_get_data(chip);
+
+ return regmap_update_bits(gpio->map,
+ LP87565_REG_GPIO_CONFIG,
+ BIT(offset), 0);
+}
+
+static int lp87565_gpio_direction_output(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ struct lp87565_gpio *gpio = gpiochip_get_data(chip);
+
+ return regmap_update_bits(gpio->map,
+ LP87565_REG_GPIO_CONFIG,
+ BIT(offset), !value ? BIT(offset) : 0);
+}
+
+static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct lp87565_gpio *gpio = gpiochip_get_data(chip);
+ int ret, val;
+
+ ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
+ if (ret < 0)
+ return ret;
+
+ return !!(val & BIT(offset));
+}
+
+static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ struct lp87565_gpio *gpio = gpiochip_get_data(chip);
+
+ regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
+ BIT(offset), value ? BIT(offset) : 0);
+}
+
+static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
+{
+ struct lp87565_gpio *gpio = gpiochip_get_data(gc);
+ int ret;
+
+ switch (offset) {
+ case 0:
+ case 1:
+ case 2:
+ /*
+ * MUX can program the pin to be in EN1/2/3 pin mode
+ * Or GPIO1/2/3 mode.
+ * Setup the GPIO*_SEL MUX to GPIO mode
+ */
+ ret = regmap_update_bits(gpio->map,
+ LP87565_REG_PIN_FUNCTION,
+ BIT(offset), BIT(offset));
+ if (ret)
+ return ret;
+
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
+ unsigned long config)
+{
+ struct lp87565_gpio *gpio = gpiochip_get_data(gc);
+
+ switch (pinconf_to_config_param(config)) {
+ case PIN_CONFIG_DRIVE_OPEN_DRAIN:
+ return regmap_update_bits(gpio->map,
+ LP87565_REG_GPIO_CONFIG,
+ BIT(offset +
+ __ffs(LP87565_GOIO1_OD)),
+ BIT(offset +
+ __ffs(LP87565_GOIO1_OD)));
+ case PIN_CONFIG_DRIVE_PUSH_PULL:
+ return regmap_update_bits(gpio->map,
+ LP87565_REG_GPIO_CONFIG,
+ BIT(offset +
+ __ffs(LP87565_GOIO1_OD)), 0);
+ default:
+ return -ENOTSUPP;
+ }
+}
+
+static const struct gpio_chip template_chip = {
+ .label = "lp87565-gpio",
+ .owner = THIS_MODULE,
+ .request = lp87565_gpio_request,
+ .get_direction = lp87565_gpio_get_direction,
+ .direction_input = lp87565_gpio_direction_input,
+ .direction_output = lp87565_gpio_direction_output,
+ .get = lp87565_gpio_get,
+ .set = lp87565_gpio_set,
+ .set_config = lp87565_gpio_set_config,
+ .base = -1,
+ .ngpio = 3,
+ .can_sleep = true,
+};
+
+static int lp87565_gpio_probe(struct platform_device *pdev)
+{
+ struct lp87565_gpio *gpio;
+ struct lp87565 *lp87565;
+ int ret;
+
+ gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+
+ lp87565 = dev_get_drvdata(pdev->dev.parent);
+ gpio->chip = template_chip;
+ gpio->chip.parent = lp87565->dev;
+ gpio->map = lp87565->regmap;
+
+ ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct platform_device_id lp87565_gpio_id_table[] = {
+ { "lp87565-q1-gpio", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
+
+static struct platform_driver lp87565_gpio_driver = {
+ .driver = {
+ .name = "lp87565-gpio",
+ },
+ .probe = lp87565_gpio_probe,
+ .id_table = lp87565_gpio_id_table,
+};
+module_platform_driver(lp87565_gpio_driver);
+
+MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
+MODULE_DESCRIPTION("LP87565 GPIO driver");
+MODULE_LICENSE("GPL v2");