Add Google hammer HID driver. This driver allow us to control hammer keyboard backlights and support future features.
Signed-off-by: Wei-Ning Huang <[email protected]> --- drivers/hid/Kconfig | 6 +++ drivers/hid/Makefile | 1 + drivers/hid/hid-core.c | 4 ++ drivers/hid/hid-google-hammer.c | 108 ++++++++++++++++++++++++++++++++++++++++ drivers/hid/hid-ids.h | 3 ++ 5 files changed, 122 insertions(+) create mode 100644 drivers/hid/hid-google-hammer.c diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig index 3cd60f460b61..efc71acbcf5b 100644 --- a/drivers/hid/Kconfig +++ b/drivers/hid/Kconfig @@ -329,6 +329,12 @@ config HOLTEK_FF Say Y here if you have a Holtek On Line Grip based game controller and want to have force feedback support for it. +config HID_GOOGLE_HAMMER + tristate "Google Hammer Keyboard" + depends on USB_HID && LEDS_CLASS + ---help--- + Say Y here if you have a Google Hammer device. + config HID_GT683R tristate "MSI GT68xR LED support" depends on LEDS_CLASS && USB_HID diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile index 8659d7e633a5..b5d3039286e3 100644 --- a/drivers/hid/Makefile +++ b/drivers/hid/Makefile @@ -43,6 +43,7 @@ obj-$(CONFIG_HID_ELO) += hid-elo.o obj-$(CONFIG_HID_EZKEY) += hid-ezkey.o obj-$(CONFIG_HID_GEMBIRD) += hid-gembird.o obj-$(CONFIG_HID_GFRM) += hid-gfrm.o +obj-$(CONFIG_HID_GOOGLE_HAMMER) += hid-google-hammer.o obj-$(CONFIG_HID_GT683R) += hid-gt683r.o obj-$(CONFIG_HID_GYRATION) += hid-gyration.o obj-$(CONFIG_HID_HOLTEK) += hid-holtek-kbd.o diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 9017dcc14502..813e3d86e2d0 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -2049,6 +2049,10 @@ static const struct hid_device_id hid_have_special_driver[] = { { HID_BLUETOOTH_DEVICE(0x58, 0x2000) }, { HID_BLUETOOTH_DEVICE(0x471, 0x2210) }, #endif +#if IS_ENABLED(CONFIG_HID_GOOGLE_HAMMER) + { HID_USB_DEVICE(USB_VENDOR_ID_GOOGLE, USB_DEVICE_ID_GOOGLE_HAMMER) }, + { HID_USB_DEVICE(USB_VENDOR_ID_GOOGLE, USB_DEVICE_ID_GOOGLE_STAFF) }, +#endif #if IS_ENABLED(CONFIG_HID_GREENASIA) { HID_USB_DEVICE(USB_VENDOR_ID_GREENASIA, 0x0012) }, #endif diff --git a/drivers/hid/hid-google-hammer.c b/drivers/hid/hid-google-hammer.c new file mode 100644 index 000000000000..b6955f01c656 --- /dev/null +++ b/drivers/hid/hid-google-hammer.c @@ -0,0 +1,108 @@ +/* + * HID driver for Google Hammer device. + * + * Copyright (c) 2017 Google Inc. + * Author: Wei-Ning Huang <[email protected]> + */ + +/* + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + */ + +#include <linux/hid.h> +#include <linux/leds.h> +#include <linux/module.h> +#include <linux/usb.h> + +#include "hid-ids.h" + +#define MAX_BRIGHTNESS 100 + +struct hammer_kbd_leds { + struct led_classdev cdev; + struct hid_device *hdev; + u8 buf[2] ____cacheline_aligned; +}; + +static int hammer_kbd_brightness_set_blocking(struct led_classdev *cdev, + enum led_brightness br) +{ + struct hammer_kbd_leds *led = container_of(cdev, + struct hammer_kbd_leds, + cdev); + int ret; + + led->buf[0] = 0; + led->buf[1] = br; + + ret = hid_hw_output_report(led->hdev, led->buf, sizeof(led->buf)); + if (ret == -ENOSYS) + ret = hid_hw_raw_request(led->hdev, 0, led->buf, + sizeof(led->buf), + HID_OUTPUT_REPORT, + HID_REQ_SET_REPORT); + if (ret < 0) + hid_err(led->hdev, "failed to set keyboard backlight: %d\n", + ret); + return ret; +} + +static int hammer_register_leds(struct hid_device *hdev) +{ + struct hammer_kbd_leds *kbd_backlight; + + kbd_backlight = devm_kzalloc(&hdev->dev, + sizeof(*kbd_backlight), + GFP_KERNEL); + if (!kbd_backlight) + return -ENOMEM; + + kbd_backlight->hdev = hdev; + kbd_backlight->cdev.name = "hammer::kbd_backlight"; + kbd_backlight->cdev.max_brightness = MAX_BRIGHTNESS; + kbd_backlight->cdev.brightness_set_blocking = + hammer_kbd_brightness_set_blocking; + kbd_backlight->cdev.flags = LED_HW_PLUGGABLE; + + /* Set backlight to 0% initially. */ + hammer_kbd_brightness_set_blocking(&kbd_backlight->cdev, 0); + + return devm_led_classdev_register(&hdev->dev, &kbd_backlight->cdev); +} + +static int hammer_input_configured(struct hid_device *hdev, + struct hid_input *hi) +{ + struct usb_interface *intf = to_usb_interface(hdev->dev.parent); + + if (intf->cur_altsetting->desc.bInterfaceProtocol == + USB_INTERFACE_PROTOCOL_KEYBOARD) { + int err = hammer_register_leds(hdev); + + if (err) + hid_warn(hdev, + "Failed to register keyboard backlight: %d\n", + err); + } + + return 0; +} + +static const struct hid_device_id hammer_devices[] = { + { HID_USB_DEVICE(USB_VENDOR_ID_GOOGLE, USB_DEVICE_ID_GOOGLE_HAMMER) }, + { HID_USB_DEVICE(USB_VENDOR_ID_GOOGLE, USB_DEVICE_ID_GOOGLE_STAFF) }, + { } +}; +MODULE_DEVICE_TABLE(hid, hammer_devices); + +static struct hid_driver hammer_driver = { + .name = "hammer", + .id_table = hammer_devices, + .input_configured = hammer_input_configured, +}; +module_hid_driver(hammer_driver); + +MODULE_LICENSE("GPL"); diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h index c9ba4c6db74c..193959700df8 100644 --- a/drivers/hid/hid-ids.h +++ b/drivers/hid/hid-ids.h @@ -434,7 +434,10 @@ #define USB_DEVICE_ID_GOODTOUCH_000f 0x000f #define USB_VENDOR_ID_GOOGLE 0x18d1 +#define USB_DEVICE_ID_GOOGLE_QUICKSTEP 0x0477 +#define USB_DEVICE_ID_GOOGLE_HAMMER 0x5022 #define USB_DEVICE_ID_GOOGLE_TOUCH_ROSE 0x5028 +#define USB_DEVICE_ID_GOOGLE_STAFF 0x502b #define USB_VENDOR_ID_GOTOP 0x08f2 #define USB_DEVICE_ID_SUPER_Q2 0x007f -- 2.12.2
