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SubjectRe: [PATCH v2] HID: google: add google hammer HID driver
On Thu, Aug 17, 2017 at 8:33 PM, Wei-Ning Huang <wnhuang@google.com> wrote:
> + Jiri Kosina <jikos@kernel.org>, linux-input@vger.kernel.org

Jiri, there are some unwanted interactions between hid-multitouch and
this driver, please hold off applying it (if you were considering it).

Thanks!

>
> On Fri, Aug 18, 2017 at 2:35 AM, Dmitry Torokhov <dtor@google.com> wrote:
>> On Thu, Aug 17, 2017 at 1:45 AM, Wei-Ning Huang <wnhuang@chromium.org> wrote:
>>> Add Google hammer HID driver. This driver allow us to control hammer
>>> keyboard backlights and support future features.
>>>
>>> Signed-off-by: Wei-Ning Huang <wnhuang@google.com>
>>
>> I was helping Wei-Ning internally with this, so
>>
>> Reviewed-by: Dmitry Torokhov <dtor@google.com>
>>
>> You might need to resend to directly to Jiri who is HID maintainer.
>>
>>> ---
>>> 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 <wnhuang@google.com>
>>> + */
>>> +
>>> +/*
>>> + * 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
>>>
>
>
>
> --
> Wei-Ning Huang, 黃偉寧 | Software Engineer, Google Inc., Taiwan |
> wnhuang@google.com | Cell: +886 910-380678

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