Some Intel platforms have an USB port mux controlled by GPIOs.
There's a single ACPI platform device that provides both USB ID
extcon device and a USB port mux device. This MFD driver will
split the 2 devices for their respective drivers.
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Suggested-by: David Cohen <david.a.cohen@xxxxxxxxxxxxxxx>
Reviewed-by: Felipe Balbi <balbi@xxxxxxxxxx>
Signed-off-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
Reviewed-by: Lee Jones <lee.jones@xxxxxxxxxx>
---
MAINTAINERS | 6 ++++
drivers/mfd/Kconfig | 8 +++++
drivers/mfd/Makefile | 1 +
drivers/mfd/intel-vuport.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 89 insertions(+)
create mode 100644 drivers/mfd/intel-vuport.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 1d0f090..0a932b3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5599,6 +5599,12 @@ L: linux-pm@xxxxxxxxxxxxxxx
S: Supported
F: drivers/cpufreq/intel_pstate.c
+INTEL VIRTUAL USB PORT DRIVER
+M: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
+L: linux-usb@xxxxxxxxxxxxxxx
+S: Supported
+F: drivers/mfd/intel-vuport.c
+
INTEL FRAMEBUFFER DRIVER (excluding 810 and 815)
M: Maik Broemme <mbroemme@xxxxxxxxxxxxx>
L: linux-fbdev@xxxxxxxxxxxxxxx
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 9ca66de..48933d4 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1534,5 +1534,13 @@ config MFD_VEXPRESS_SYSREG
System Registers are the platform configuration block
on the ARM Ltd. Versatile Express board.
+config MFD_INTEL_VUPORT
+ tristate "Intel virtual USB port controller"
+ select MFD_CORE
+ depends on X86 && ACPI
+ help
+ Say Y here to enable support for Intel's dual role port mux
+ controlled by GPIOs.
+
endmenu
endif
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 0f230a6..0ccd107 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -198,3 +198,4 @@ intel-soc-pmic-objs := intel_soc_pmic_core.o intel_soc_pmic_crc.o
intel-soc-pmic-$(CONFIG_INTEL_PMC_IPC) += intel_soc_pmic_bxtwc.o
obj-$(CONFIG_INTEL_SOC_PMIC) += intel-soc-pmic.o
obj-$(CONFIG_MFD_MT6397) += mt6397-core.o
+obj-$(CONFIG_MFD_INTEL_VUPORT) += intel-vuport.o
diff --git a/drivers/mfd/intel-vuport.c b/drivers/mfd/intel-vuport.c
new file mode 100644
index 0000000..a07920f
--- /dev/null
+++ b/drivers/mfd/intel-vuport.c
@@ -0,0 +1,74 @@
+/*
+ * MFD driver for Intel virtual USB port
+ *
+ * Copyright(c) 2016 Intel Corporation.
+ * Author: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
+ *
+ * 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.
+ */
+
+#include <linux/acpi.h>
+#include <linux/gpio.h>
+#include <linux/mfd/core.h>
+#include <linux/platform_device.h>
+
+/* ACPI GPIO Mappings */
+static const struct acpi_gpio_params id_gpio = { 0, 0, false };
+static const struct acpi_gpio_params vbus_gpio = { 1, 0, false };
+static const struct acpi_gpio_params mux_gpio = { 2, 0, false };
+static const struct acpi_gpio_mapping acpi_usb_gpios[] = {
+ { "id-gpios", &id_gpio, 1 },
+ { "vbus_en-gpios", &vbus_gpio, 1 },
+ { "usb_mux-gpios", &mux_gpio, 1 },
+ { },
+};
+
+static const struct mfd_cell intel_vuport_mfd_cells[] = {
+ { .name = "extcon-usb-gpio", },
+ { .name = "intel-mux-gpio", },
+};
+
+static int vuport_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ int ret;
+
+ ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), acpi_usb_gpios);
+ if (ret)
+ return ret;
+
+ return mfd_add_devices(&pdev->dev, 0, intel_vuport_mfd_cells,
+ ARRAY_SIZE(intel_vuport_mfd_cells), NULL, 0,
+ NULL);
+}
+
+static int vuport_remove(struct platform_device *pdev)
+{
+ mfd_remove_devices(&pdev->dev);
+ acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
+
+ return 0;
+}
+
+static struct acpi_device_id vuport_acpi_match[] = {
+ { "INT3496" },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, vuport_acpi_match);
+
+static struct platform_driver vuport_driver = {
+ .driver = {
+ .name = "intel-vuport",
+ .acpi_match_table = ACPI_PTR(vuport_acpi_match),
+ },
+ .probe = vuport_probe,
+ .remove = vuport_remove,
+};
+
+module_platform_driver(vuport_driver);
+
+MODULE_AUTHOR("Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Intel virtual USB port");
+MODULE_LICENSE("GPL v2");
--
2.1.4
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