From c9da9564afc2fbb2cb1147c9aa88bfed3446a7fa Mon Sep 17 00:00:00 2001
From: handsomeyingyan <handsomeyingyan@github.com>
Date: Sun, 2 May 2021 10:13:20 +0800
Subject: [PATCH 76/78] add dummy usb extcon driver

---
 drivers/dma/qcom/bam_dma.c.rej    | 11 -------
 drivers/extcon/Kconfig            |  7 +++++
 drivers/extcon/Makefile           |  1 +
 drivers/extcon/extcon-usb-dummy.c | 51 +++++++++++++++++++++++++++++++
 4 files changed, 59 insertions(+), 11 deletions(-)
 delete mode 100644 drivers/dma/qcom/bam_dma.c.rej
 create mode 100644 drivers/extcon/extcon-usb-dummy.c

diff --git a/drivers/dma/qcom/bam_dma.c.rej b/drivers/dma/qcom/bam_dma.c.rej
deleted file mode 100644
index 8ec6dd46b..000000000
--- a/drivers/dma/qcom/bam_dma.c.rej
+++ /dev/null
@@ -1,11 +0,0 @@
---- drivers/dma/qcom/bam_dma.c
-+++ drivers/dma/qcom/bam_dma.c
-@@ -1292,7 +1314,7 @@ static int bam_dma_probe(struct platform_device *pdev)
- 			dev_err(bdev->dev, "num-ees unspecified in dt\n");
- 	}
- 
--	if (bdev->controlled_remotely)
-+	if (bdev->controlled_remotely || bdev->remote_power_collapse)
- 		bdev->bamclk = devm_clk_get_optional(bdev->dev, "bam_clk");
- 	else
- 		bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk");
diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig
index aac507bff..b2238d3ff 100644
--- a/drivers/extcon/Kconfig
+++ b/drivers/extcon/Kconfig
@@ -172,6 +172,13 @@ config EXTCON_SM5502
 	  Silicon Mitus SM5502. The SM5502 is a USB port accessory
 	  detector and switch.
 
+config EXTCON_USB_DUMMY
+	tristate "Dummy USB extcon support"
+	help
+	  Say Y here to create an extcon device that always reports USB=1
+	  and nothing else. This is stupid, but helpful as workaround for some
+	  funny implementation details for now. Just look away. Now! Still here?
+
 config EXTCON_USB_GPIO
 	tristate "USB GPIO extcon support"
 	depends on GPIOLIB || COMPILE_TEST
diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
index 52096fd8a..d0fd36817 100644
--- a/drivers/extcon/Makefile
+++ b/drivers/extcon/Makefile
@@ -23,5 +23,6 @@ obj-$(CONFIG_EXTCON_PTN5150)	+= extcon-ptn5150.o
 obj-$(CONFIG_EXTCON_QCOM_SPMI_MISC) += extcon-qcom-spmi-misc.o
 obj-$(CONFIG_EXTCON_RT8973A)	+= extcon-rt8973a.o
 obj-$(CONFIG_EXTCON_SM5502)	+= extcon-sm5502.o
+obj-$(CONFIG_EXTCON_USB_DUMMY)	+= extcon-usb-dummy.o
 obj-$(CONFIG_EXTCON_USB_GPIO)	+= extcon-usb-gpio.o
 obj-$(CONFIG_EXTCON_USBC_CROS_EC) += extcon-usbc-cros-ec.o
diff --git a/drivers/extcon/extcon-usb-dummy.c b/drivers/extcon/extcon-usb-dummy.c
new file mode 100644
index 000000000..8a56ffd33
--- /dev/null
+++ b/drivers/extcon/extcon-usb-dummy.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/extcon-provider.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+static const unsigned int extcon_dummy_cable[] = {
+	EXTCON_USB,
+	EXTCON_NONE,
+};
+
+static int extcon_dummy_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct extcon_dev *edev;
+	int ret;
+
+	edev = devm_extcon_dev_allocate(dev, extcon_dummy_cable);
+	if (IS_ERR(edev))
+		return PTR_ERR(edev);
+
+	ret = devm_extcon_dev_register(dev, edev);
+	if (ret < 0) {
+		dev_err(dev, "failed to register extcon device: %d\n", ret);
+		return ret;
+	}
+
+	/* Pretend that USB is always connected */
+	extcon_set_state_sync(edev, EXTCON_USB, true);
+
+	return 0;
+}
+
+static const struct of_device_id extcon_dummy_of_match[] = {
+	{ .compatible = "linux,extcon-usb-dummy", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, extcon_dummy_of_match);
+
+static struct platform_driver extcon_dummy_driver = {
+	.probe = extcon_dummy_probe,
+	.driver = {
+		.name = "extcon-usb-dummy",
+		.of_match_table = extcon_dummy_of_match,
+	},
+};
+module_platform_driver(extcon_dummy_driver);
+
+MODULE_DESCRIPTION("Dummy USB extcon driver");
+MODULE_LICENSE("GPL v2");
-- 
2.31.1