linux-kernel - [PATCH] platform/chrome: Create new USB driver for RGB keyboard in ChromeOS devices

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Date:   Wed, 30 Nov 2022 23:19:36 +0000
From:   Won Chung <wonchung@...gle.com>
To:     wonchung@...gle.com, Benson Leung <bleung@...omium.org>,
        linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev
Subject: [PATCH] platform/chrome: Create new USB driver for RGB keyboard in
 ChromeOS devices

Without any driver bound to RGB keyboard, it may not be suspended
properly, preventing USB xHCI to be suspended and causing power drain.
Create new USB driver for RGB keyboard so that it can be suspended
properly.

Signed-off-by: Won Chung <wonchung@...gle.com>
---
 drivers/platform/chrome/Kconfig             |  8 ++++
 drivers/platform/chrome/Makefile            |  1 +
 drivers/platform/chrome/cros_rgb_keyboard.c | 44 +++++++++++++++++++++
 3 files changed, 53 insertions(+)
 create mode 100644 drivers/platform/chrome/cros_rgb_keyboard.c

diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
index c45fb376d653..a7c36df99432 100644
--- a/drivers/platform/chrome/Kconfig
+++ b/drivers/platform/chrome/Kconfig
@@ -265,6 +265,14 @@ config CHROMEOS_PRIVACY_SCREEN
 	  this should probably always be built into the kernel to avoid or
 	  minimize drm probe deferral.
 
+config CROS_RGB_KEYBOARD
+	tristate "ChromeOS RGB keyboard"
+	depends on USB
+	help
+	  This driver supports RGB keyboard in some ChromeOS devices. This shall be
+	  enabled if RGB keyboard is present, otherwise it may not be suspended
+	  properly.
+
 source "drivers/platform/chrome/wilco_ec/Kconfig"
 
 # Kunit test cases
diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
index f7e74a845afc..e4ffa17c57fc 100644
--- a/drivers/platform/chrome/Makefile
+++ b/drivers/platform/chrome/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_CROS_EC_SENSORHUB)		+= cros-ec-sensorhub.o
 obj-$(CONFIG_CROS_EC_SYSFS)		+= cros_ec_sysfs.o
 obj-$(CONFIG_CROS_USBPD_LOGGER)		+= cros_usbpd_logger.o
 obj-$(CONFIG_CROS_USBPD_NOTIFY)		+= cros_usbpd_notify.o
+obj-$(CONFIG_CROS_RGB_KEYBOARD)		+= cros_rgb_keyboard.o
 
 obj-$(CONFIG_WILCO_EC)			+= wilco_ec/
 
diff --git a/drivers/platform/chrome/cros_rgb_keyboard.c b/drivers/platform/chrome/cros_rgb_keyboard.c
new file mode 100644
index 000000000000..1d53fc832d76
--- /dev/null
+++ b/drivers/platform/chrome/cros_rgb_keyboard.c
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: GPL-2.0
+// RGB keyboard driver for ChromeOS
+//
+// Copyright (C) 2022 Google, Inc.
+
+#include <linux/module.h>
+#include <linux/usb.h>
+
+#define DRV_NAME "cros-rgb-keyboard"
+
+/* vendor ID */
+#define ID_GOOGLE 0x18d1
+/* product ID */
+#define ID_PRISM 0x5022
+
+static const struct usb_device_id cros_rgb_keyboard_table[] = {
+	{USB_DEVICE(ID_GOOGLE, ID_PRISM)},
+	{} // terminating null entry
+};
+
+static int cros_rgb_keyboard_probe(struct usb_interface *interface, const struct usb_device_id *id)
+{
+	struct usb_device *udev = interface_to_usbdev(interface);
+
+	usb_enable_autosuspend(udev);
+	return 0;
+}
+
+static void cros_rgb_keyboard_disconnect(struct usb_interface *interface)
+{
+}
+
+/* usb specific object needed to register this driver with the usb subsystem */
+static struct usb_driver cros_rgb_keyboard_driver = {
+	.name = DRV_NAME,
+	.id_table = cros_rgb_keyboard_table,
+	.probe = cros_rgb_keyboard_probe,
+	.disconnect = cros_rgb_keyboard_disconnect,
+};
+
+module_usb_driver(cros_rgb_keyboard_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ChromeOS RGB keyboard driver");
-- 
2.39.0.rc0.267.gcb52ba06e7-goog