drivers/hid/hid-gfrm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * HID driver for Google Fiber TV Box remote controls
   4  *
   5  * Copyright (c) 2014-2015 Google Inc.
   6  *
   7  * Author: Petri Gynther <pgynther@google.com>
   8  */
   9 #include <linux/device.h>
  10 #include <linux/hid.h>
  11 #include <linux/input.h>
  12 #include <linux/module.h>
  13
  14 #include "hid-ids.h"
  15
  16 #define GFRM100  1  /* Google Fiber GFRM100 (Bluetooth classic) */
  17 #define GFRM200  2  /* Google Fiber GFRM200 (Bluetooth LE) */
  18
  19 #define GFRM100_SEARCH_KEY_REPORT_ID   0xF7
  20 #define GFRM100_SEARCH_KEY_DOWN        0x0
  21 #define GFRM100_SEARCH_KEY_AUDIO_DATA  0x1
  22 #define GFRM100_SEARCH_KEY_UP          0x2
  23
  24 static u8 search_key_dn[3] = {0x40, 0x21, 0x02};
  25 static u8 search_key_up[3] = {0x40, 0x00, 0x00};
  26
  27 static int gfrm_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  28                 struct hid_field *field, struct hid_usage *usage,
  29                 unsigned long **bit, int *max)
  30 {
  31         unsigned long hdev_type = (unsigned long) hid_get_drvdata(hdev);
  32
  33         if (hdev_type == GFRM100) {
  34                 if (usage->hid == (HID_UP_CONSUMER | 0x4)) {
  35                         /* Consumer.0004 -> KEY_INFO */
  36                         hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_INFO);
  37                         return 1;
  38                 }
  39
  40                 if (usage->hid == (HID_UP_CONSUMER | 0x41)) {
  41                         /* Consumer.0041 -> KEY_OK */
  42                         hid_map_usage_clear(hi, usage, bit, max, EV_KEY, KEY_OK);
  43                         return 1;
  44                 }
  45         }
  46
  47         return 0;
  48 }
  49
  50 static int gfrm_raw_event(struct hid_device *hdev, struct hid_report *report,
  51                 u8 *data, int size)
  52 {
  53         unsigned long hdev_type = (unsigned long) hid_get_drvdata(hdev);
  54         int ret = 0;
  55
  56         if (hdev_type != GFRM100)
  57                 return 0;
  58
  59         if (size < 2 || data[0] != GFRM100_SEARCH_KEY_REPORT_ID)
  60                 return 0;
  61
  62         /*
  63          * Convert GFRM100 Search key reports into Consumer.0221 (Key.Search)
  64          * reports. Ignore audio data.
  65          */
  66         switch (data[1]) {
  67         case GFRM100_SEARCH_KEY_DOWN:
  68                 ret = hid_report_raw_event(hdev, HID_INPUT_REPORT, search_key_dn,
  69                                            sizeof(search_key_dn), 1);
  70                 break;
  71
  72         case GFRM100_SEARCH_KEY_AUDIO_DATA:
  73                 break;
  74
  75         case GFRM100_SEARCH_KEY_UP:
  76                 ret = hid_report_raw_event(hdev, HID_INPUT_REPORT, search_key_up,
  77                                            sizeof(search_key_up), 1);
  78                 break;
  79
  80         default:
  81                 break;
  82         }
  83
  84         return (ret < 0) ? ret : -1;
  85 }
  86
  87 static int gfrm_input_configured(struct hid_device *hid, struct hid_input *hidinput)
  88 {
  89         /*
  90          * Enable software autorepeat with:
  91          * - repeat delay: 400 msec
  92          * - repeat period: 100 msec
  93          */
  94         input_enable_softrepeat(hidinput->input, 400, 100);
  95         return 0;
  96 }
  97
  98 static int gfrm_probe(struct hid_device *hdev, const struct hid_device_id *id)
  99 {
 100         int ret;
 101
 102         hid_set_drvdata(hdev, (void *) id->driver_data);
 103
 104         ret = hid_parse(hdev);
 105         if (ret)
 106                 goto done;
 107
 108         if (id->driver_data == GFRM100) {
 109                 /*
 110                  * GFRM100 HID Report Descriptor does not describe the Search
 111                  * key reports. Thus, we need to add it manually here, so that
 112                  * those reports reach gfrm_raw_event() from hid_input_report().
 113                  */
 114                 if (!hid_register_report(hdev, HID_INPUT_REPORT,
 115                                          GFRM100_SEARCH_KEY_REPORT_ID, 0)) {
 116                         ret = -ENOMEM;
 117                         goto done;
 118                 }
 119         }
 120
 121         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 122 done:
 123         return ret;
 124 }
 125
 126 static const struct hid_device_id gfrm_devices[] = {
 127         { HID_BLUETOOTH_DEVICE(0x58, 0x2000),
 128                 .driver_data = GFRM100 },
 129         { HID_BLUETOOTH_DEVICE(0x471, 0x2210),
 130                 .driver_data = GFRM200 },
 131         { }
 132 };
 133 MODULE_DEVICE_TABLE(hid, gfrm_devices);
 134
 135 static struct hid_driver gfrm_driver = {
 136         .name = "gfrm",
 137         .id_table = gfrm_devices,
 138         .probe = gfrm_probe,
 139         .input_mapping = gfrm_input_mapping,
 140         .raw_event = gfrm_raw_event,
 141         .input_configured = gfrm_input_configured,
 142 };
 143
 144 module_hid_driver(gfrm_driver);
 145
 146 MODULE_AUTHOR("Petri Gynther <pgynther@google.com>");
 147 MODULE_DESCRIPTION("Google Fiber TV Box remote control driver");
 148 MODULE_LICENSE("GPL");