ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/w1/masters/w1-gpio.c b/marvell/linux/drivers/w1/masters/w1-gpio.c
new file mode 100644
index 0000000..dc9eb99
--- /dev/null
+++ b/marvell/linux/drivers/w1/masters/w1-gpio.c
@@ -0,0 +1,206 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * w1-gpio - GPIO w1 bus master driver
+ *
+ * Copyright (C) 2007 Ville Syrjala <syrjala@sci.fi>
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/w1-gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/of_platform.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/delay.h>
+
+#include <linux/w1.h>
+
+static u8 w1_gpio_set_pullup(void *data, int delay)
+{
+ struct w1_gpio_platform_data *pdata = data;
+
+ if (delay) {
+ pdata->pullup_duration = delay;
+ } else {
+ if (pdata->pullup_duration) {
+ /*
+ * This will OVERRIDE open drain emulation and force-pull
+ * the line high for some time.
+ */
+ gpiod_set_raw_value(pdata->gpiod, 1);
+ msleep(pdata->pullup_duration);
+ /*
+ * This will simply set the line as input since we are doing
+ * open drain emulation in the GPIO library.
+ */
+ gpiod_set_value(pdata->gpiod, 1);
+ }
+ pdata->pullup_duration = 0;
+ }
+
+ return 0;
+}
+
+static void w1_gpio_write_bit(void *data, u8 bit)
+{
+ struct w1_gpio_platform_data *pdata = data;
+
+ gpiod_set_value(pdata->gpiod, bit);
+}
+
+static u8 w1_gpio_read_bit(void *data)
+{
+ struct w1_gpio_platform_data *pdata = data;
+
+ return gpiod_get_value(pdata->gpiod) ? 1 : 0;
+}
+
+#if defined(CONFIG_OF)
+static const struct of_device_id w1_gpio_dt_ids[] = {
+ { .compatible = "w1-gpio" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, w1_gpio_dt_ids);
+#endif
+
+static int w1_gpio_probe(struct platform_device *pdev)
+{
+ struct w1_bus_master *master;
+ struct w1_gpio_platform_data *pdata;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ /* Enforce open drain mode by default */
+ enum gpiod_flags gflags = GPIOD_OUT_LOW_OPEN_DRAIN;
+ int err;
+
+ if (of_have_populated_dt() && !dev_get_platdata(&pdev->dev)) {
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ /*
+ * This parameter means that something else than the gpiolib has
+ * already set the line into open drain mode, so we should just
+ * driver it high/low like we are in full control of the line and
+ * open drain will happen transparently.
+ */
+ if (of_get_property(np, "linux,open-drain", NULL))
+ gflags = GPIOD_OUT_LOW;
+
+ pdev->dev.platform_data = pdata;
+ }
+ pdata = dev_get_platdata(dev);
+
+ if (!pdata) {
+ dev_err(dev, "No configuration data\n");
+ return -ENXIO;
+ }
+
+ master = devm_kzalloc(dev, sizeof(struct w1_bus_master),
+ GFP_KERNEL);
+ if (!master) {
+ dev_err(dev, "Out of memory\n");
+ return -ENOMEM;
+ }
+
+ pdata->gpiod = devm_gpiod_get_index(dev, NULL, 0, gflags);
+ if (IS_ERR(pdata->gpiod)) {
+ dev_err(dev, "gpio_request (pin) failed\n");
+ return PTR_ERR(pdata->gpiod);
+ }
+
+ pdata->pullup_gpiod =
+ devm_gpiod_get_index_optional(dev, NULL, 1, GPIOD_OUT_LOW);
+ if (IS_ERR(pdata->pullup_gpiod)) {
+ dev_err(dev, "gpio_request_one "
+ "(ext_pullup_enable_pin) failed\n");
+ return PTR_ERR(pdata->pullup_gpiod);
+ }
+
+ master->data = pdata;
+ master->read_bit = w1_gpio_read_bit;
+ gpiod_direction_output(pdata->gpiod, 1);
+ master->write_bit = w1_gpio_write_bit;
+
+ /*
+ * If we are using open drain emulation from the GPIO library,
+ * we need to use this pullup function that hammers the line
+ * high using a raw accessor to provide pull-up for the w1
+ * line.
+ */
+ if (gflags == GPIOD_OUT_LOW_OPEN_DRAIN)
+ master->set_pullup = w1_gpio_set_pullup;
+
+ err = w1_add_master_device(master);
+ if (err) {
+ dev_err(dev, "w1_add_master device failed\n");
+ return err;
+ }
+
+ if (pdata->enable_external_pullup)
+ pdata->enable_external_pullup(1);
+
+ if (pdata->pullup_gpiod)
+ gpiod_set_value(pdata->pullup_gpiod, 1);
+
+ platform_set_drvdata(pdev, master);
+
+ return 0;
+}
+
+static int w1_gpio_remove(struct platform_device *pdev)
+{
+ struct w1_bus_master *master = platform_get_drvdata(pdev);
+ struct w1_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
+
+ if (pdata->enable_external_pullup)
+ pdata->enable_external_pullup(0);
+
+ if (pdata->pullup_gpiod)
+ gpiod_set_value(pdata->pullup_gpiod, 0);
+
+ w1_remove_master_device(master);
+
+ return 0;
+}
+
+static int __maybe_unused w1_gpio_suspend(struct device *dev)
+{
+ struct w1_gpio_platform_data *pdata = dev_get_platdata(dev);
+
+ if (pdata->enable_external_pullup)
+ pdata->enable_external_pullup(0);
+
+ return 0;
+}
+
+static int __maybe_unused w1_gpio_resume(struct device *dev)
+{
+ struct w1_gpio_platform_data *pdata = dev_get_platdata(dev);
+
+ if (pdata->enable_external_pullup)
+ pdata->enable_external_pullup(1);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(w1_gpio_pm_ops, w1_gpio_suspend, w1_gpio_resume);
+
+static struct platform_driver w1_gpio_driver = {
+ .driver = {
+ .name = "w1-gpio",
+ .pm = &w1_gpio_pm_ops,
+ .of_match_table = of_match_ptr(w1_gpio_dt_ids),
+ },
+ .probe = w1_gpio_probe,
+ .remove = w1_gpio_remove,
+};
+
+module_platform_driver(w1_gpio_driver);
+
+MODULE_DESCRIPTION("GPIO w1 bus master driver");
+MODULE_AUTHOR("Ville Syrjala <syrjala@sci.fi>");
+MODULE_LICENSE("GPL");