Commit bc774b8c authored by Wei-Ning Huang's avatar Wei-Ning Huang Committed by Jiri Kosina
Browse files

HID: google: add google hammer HID driver 



Add Google hammer HID driver. This driver allow us to control hammer
keyboard backlight and support future features.

Signed-off-by: default avatarWei-Ning Huang <wnhuang@google.com>
Signed-off-by: default avatarNicolas Boichat <drinkcat@chromium.org>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 183b6366

drivers/hid/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -331,6 +331,12 @@ 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

drivers/hid/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -44,6 +44,7 @@ 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

drivers/hid/hid-google-hammer.c

0 → 100644
+124 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0+

/*

 *  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 "hid-ids.h"



#define MAX_BRIGHTNESS 100



/* HID usage for keyboard backlight (Alphanumeric display brightness) */

#define HID_AD_BRIGHTNESS 0x00140046



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 list_head *report_list =

		&hdev->report_enum[HID_OUTPUT_REPORT].report_list;

	struct hid_report *report;



	if (list_empty(report_list))

		return 0;



	report = list_first_entry(report_list, struct hid_report, list);



	if (report->maxfield == 1 &&

	    report->field[0]->application == HID_GD_KEYBOARD &&

	    report->field[0]->maxusage == 1 &&

	    report->field[0]->usage[0].hid == HID_AD_BRIGHTNESS) {

		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_DEVICE(BUS_USB, HID_GROUP_GENERIC,

		     USB_VENDOR_ID_GOOGLE, USB_DEVICE_ID_GOOGLE_HAMMER) },

	{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,

		     USB_VENDOR_ID_GOOGLE, USB_DEVICE_ID_GOOGLE_STAFF) },

	{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,

		     USB_VENDOR_ID_GOOGLE, USB_DEVICE_ID_GOOGLE_WAND) },

	{ }

};

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");

drivers/hid/hid-ids.h

+3 −0
Original line number Diff line number Diff line
@@ -445,7 +445,10 @@ 
#define USB_DEVICE_ID_GOODTOUCH_000f	0x000f



#define USB_VENDOR_ID_GOOGLE		0x18d1

#define USB_DEVICE_ID_GOOGLE_HAMMER	0x5022

#define USB_DEVICE_ID_GOOGLE_TOUCH_ROSE	0x5028

#define USB_DEVICE_ID_GOOGLE_STAFF	0x502b

#define USB_DEVICE_ID_GOOGLE_WAND	0x502d



#define USB_VENDOR_ID_GOTOP		0x08f2

#define USB_DEVICE_ID_SUPER_Q2		0x007f