--- /dev/null
+/*
+ * Copyright 2015 Verifone Int.
+ *
+ * Author: Nicolas Saenz Julienne <nicolassaenzj@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify i t
+ * under the terms of the GNU General Public License as published by th e
+ * Free Software Foundation; either version 2 of the License, or (at you r
+ * option) any later version.
+ *
+ * This driver is based on the gpio-tps65912 implementation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/gpio/driver.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/tps65218.h>
+#include "gpiolib.h"
+
+struct tps65218_gpio {
+ struct tps65218 *tps65218;
+ struct gpio_chip gpio_chip;
+};
+
+static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+ struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
+ struct tps65218 *tps65218 = tps65218_gpio->tps65218;
+ unsigned int val;
+ int ret;
+
+ ret = tps65218_reg_read(tps65218, TPS65218_REG_ENABLE2, &val);
+ if (ret)
+ return ret;
+
+ return !!(val & (TPS65218_ENABLE2_GPIO1 << offset));
+}
+
+static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
+ struct tps65218 *tps65218 = tps65218_gpio->tps65218;
+
+ if (value)
+ tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
+ TPS65218_ENABLE2_GPIO1 << offset,
+ TPS65218_ENABLE2_GPIO1 << offset,
+ TPS65218_PROTECT_L1);
+ else
+ tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
+ TPS65218_ENABLE2_GPIO1 << offset,
+ TPS65218_PROTECT_L1);
+}
+
+static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ /* Only drives GPOs */
+ return 0;
+}
+
+static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
+{
+ return -EPERM;
+}
+
+static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
+{
+ struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
+ struct tps65218 *tps65218 = tps65218_gpio->tps65218;
+ unsigned long flags = gc->desc[offset].flags;
+ int ret;
+
+ if (flags & FLAG_OPEN_SOURCE) {
+ dev_err(gc->parent, "can't work as open source\n");
+ return -EINVAL;
+ }
+
+ switch (offset) {
+ case 0:
+ if (!(flags & FLAG_OPEN_DRAIN)) {
+ dev_err(gc->parent, "GPO1 works only as open drain\n");
+ return -EINVAL;
+ }
+
+ /* Disable sequencer for GPO1 */
+ ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
+ TPS65218_SEQ7_GPO1_SEQ_MASK,
+ TPS65218_PROTECT_L1);
+ if (ret)
+ return ret;
+
+ /* Setup GPO1 */
+ ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
+ TPS65218_CONFIG1_IO1_SEL,
+ TPS65218_PROTECT_L1);
+ if (ret)
+ return ret;
+
+ break;
+ case 1:
+ /* GP02 is push-pull by default, can be set as open drain. */
+ if (flags & FLAG_OPEN_DRAIN) {
+ ret = tps65218_clear_bits(tps65218,
+ TPS65218_REG_CONFIG1,
+ TPS65218_CONFIG1_GPO2_BUF,
+ TPS65218_PROTECT_L1);
+ if (ret)
+ return ret;
+ }
+
+ /* Setup GPO2 */
+ ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
+ TPS65218_CONFIG1_IO1_SEL,
+ TPS65218_PROTECT_L1);
+ if (ret)
+ return ret;
+
+ break;
+
+ case 2:
+ if (!(flags & FLAG_OPEN_DRAIN)) {
+ dev_err(gc->parent, "GPO3 works only as open drain\n");
+ return -EINVAL;
+ }
+
+ /* Disable sequencer for GPO3 */
+ ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
+ TPS65218_SEQ7_GPO3_SEQ_MASK,
+ TPS65218_PROTECT_L1);
+ if (ret)
+ return ret;
+
+ /* Setup GPO3 */
+ ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
+ TPS65218_CONFIG2_DC12_RST,
+ TPS65218_PROTECT_L1);
+ if (ret)
+ return ret;
+
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static struct gpio_chip template_chip = {
+ .label = "gpio-tps65218",
+ .owner = THIS_MODULE,
+ .request = tps65218_gpio_request,
+ .direction_output = tps65218_gpio_output,
+ .direction_input = tps65218_gpio_input,
+ .get = tps65218_gpio_get,
+ .set = tps65218_gpio_set,
+ .can_sleep = true,
+ .ngpio = 3,
+ .base = -1,
+};
+
+static int tps65218_gpio_probe(struct platform_device *pdev)
+{
+ struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
+ struct tps65218_gpio *tps65218_gpio;
+ int ret;
+
+ tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
+ GFP_KERNEL);
+ if (!tps65218_gpio)
+ return -ENOMEM;
+
+ tps65218_gpio->tps65218 = tps65218;
+ tps65218_gpio->gpio_chip = template_chip;
+ tps65218_gpio->gpio_chip.parent = &pdev->dev;
+#ifdef CONFIG_OF_GPIO
+ tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node;
+#endif
+
+ ret = gpiochip_add_data(&tps65218_gpio->gpio_chip, tps65218_gpio);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, tps65218_gpio);
+
+ return ret;
+}
+
+static int tps65218_gpio_remove(struct platform_device *pdev)
+{
+ struct tps65218_gpio *tps65218_gpio = platform_get_drvdata(pdev);
+
+ gpiochip_remove(&tps65218_gpio->gpio_chip);
+
+ return 0;
+}
+
+static const struct of_device_id tps65218_dt_match[] = {
+ { .compatible = "ti,tps65218-gpio" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tps65218_dt_match);
+
+static struct platform_driver tps65218_gpio_driver = {
+ .driver = {
+ .name = "tps65218-gpio",
+ .of_match_table = of_match_ptr(tps65218_dt_match)
+ },
+ .probe = tps65218_gpio_probe,
+ .remove = tps65218_gpio_remove,
+};
+
+module_platform_driver(tps65218_gpio_driver);
+
+MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
+MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:tps65218-gpio");
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff