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drivers/hid/hid-google-hammer.c
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// 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; |
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/* * Request USB HID device to be in Full On mode, so that sending * hardware output report and hardware raw request won't fail. */ ret = hid_hw_power(led->hdev, PM_HINT_FULLON); if (ret < 0) { hid_err(led->hdev, "failed: device not resumed %d ", ret); return ret; } |
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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 ", ret); |
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/* Request USB HID device back to Normal Mode. */ hid_hw_power(led->hdev, PM_HINT_NORMAL); |
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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 ", 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) }, |
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{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC, USB_VENDOR_ID_GOOGLE, USB_DEVICE_ID_GOOGLE_WHISKERS) }, |
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{ } }; 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"); |