--- /dev/null
+/*
+ * ION iCade input driver
+ *
+ * Copyright (c) 2012 Bastien Nocera <hadess@hadess.net>
+ * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.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/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+/*
+ * ↑ A C Y L
+ * ← →
+ * ↓ B X Z R
+ *
+ *
+ * UP ON,OFF = w,e
+ * RT ON,OFF = d,c
+ * DN ON,OFF = x,z
+ * LT ON,OFF = a,q
+ * A ON,OFF = y,t
+ * B ON,OFF = h,r
+ * C ON,OFF = u,f
+ * X ON,OFF = j,n
+ * Y ON,OFF = i,m
+ * Z ON,OFF = k,p
+ * L ON,OFF = o,g
+ * R ON,OFF = l,v
+ */
+
+/* The translation code uses HID usage instead of input layer
+ * keys. This code generates a lookup table that makes
+ * translation quick.
+ *
+ * #include <linux/input.h>
+ * #include <stdio.h>
+ * #include <assert.h>
+ *
+ * #define unk KEY_UNKNOWN
+ *
+ * < copy of hid_keyboard[] from hid-input.c >
+ *
+ * struct icade_key_translation {
+ * int from;
+ * const char *to;
+ * int press;
+ * };
+ *
+ * static const struct icade_key_translation icade_keys[] = {
+ * { KEY_W, "KEY_UP", 1 },
+ * { KEY_E, "KEY_UP", 0 },
+ * { KEY_D, "KEY_RIGHT", 1 },
+ * { KEY_C, "KEY_RIGHT", 0 },
+ * { KEY_X, "KEY_DOWN", 1 },
+ * { KEY_Z, "KEY_DOWN", 0 },
+ * { KEY_A, "KEY_LEFT", 1 },
+ * { KEY_Q, "KEY_LEFT", 0 },
+ * { KEY_Y, "BTN_A", 1 },
+ * { KEY_T, "BTN_A", 0 },
+ * { KEY_H, "BTN_B", 1 },
+ * { KEY_R, "BTN_B", 0 },
+ * { KEY_U, "BTN_C", 1 },
+ * { KEY_F, "BTN_C", 0 },
+ * { KEY_J, "BTN_X", 1 },
+ * { KEY_N, "BTN_X", 0 },
+ * { KEY_I, "BTN_Y", 1 },
+ * { KEY_M, "BTN_Y", 0 },
+ * { KEY_K, "BTN_Z", 1 },
+ * { KEY_P, "BTN_Z", 0 },
+ * { KEY_O, "BTN_THUMBL", 1 },
+ * { KEY_G, "BTN_THUMBL", 0 },
+ * { KEY_L, "BTN_THUMBR", 1 },
+ * { KEY_V, "BTN_THUMBR", 0 },
+ *
+ * { }
+ * };
+ *
+ * static int
+ * usage_for_key (int key)
+ * {
+ * int i;
+ * for (i = 0; i < 256; i++) {
+ * if (hid_keyboard[i] == key)
+ * return i;
+ * }
+ * assert(0);
+ * }
+ *
+ * int main (int argc, char **argv)
+ * {
+ * const struct icade_key_translation *trans;
+ * int max_usage = 0;
+ *
+ * for (trans = icade_keys; trans->from; trans++) {
+ * int usage = usage_for_key (trans->from);
+ * max_usage = usage > max_usage ? usage : max_usage;
+ * }
+ *
+ * printf ("#define ICADE_MAX_USAGE %d\n\n", max_usage);
+ * printf ("struct icade_key {\n");
+ * printf ("\tu16 to;\n");
+ * printf ("\tu8 press:1;\n");
+ * printf ("};\n\n");
+ * printf ("static const struct icade_key "
+ * "icade_usage_table[%d] = {\n", max_usage + 1);
+ * for (trans = icade_keys; trans->from; trans++) {
+ * printf ("\t[%d] = { %s, %d },\n",
+ * usage_for_key (trans->from), trans->to, trans->press);
+ * }
+ * printf ("};\n");
+ *
+ * return 0;
+ * }
+ */
+
+#define ICADE_MAX_USAGE 29
+
+struct icade_key {
+ u16 to;
+ u8 press:1;
+};
+
+static const struct icade_key icade_usage_table[30] = {
+ [26] = { KEY_UP, 1 },
+ [8] = { KEY_UP, 0 },
+ [7] = { KEY_RIGHT, 1 },
+ [6] = { KEY_RIGHT, 0 },
+ [27] = { KEY_DOWN, 1 },
+ [29] = { KEY_DOWN, 0 },
+ [4] = { KEY_LEFT, 1 },
+ [20] = { KEY_LEFT, 0 },
+ [28] = { BTN_A, 1 },
+ [23] = { BTN_A, 0 },
+ [11] = { BTN_B, 1 },
+ [21] = { BTN_B, 0 },
+ [24] = { BTN_C, 1 },
+ [9] = { BTN_C, 0 },
+ [13] = { BTN_X, 1 },
+ [17] = { BTN_X, 0 },
+ [12] = { BTN_Y, 1 },
+ [16] = { BTN_Y, 0 },
+ [14] = { BTN_Z, 1 },
+ [19] = { BTN_Z, 0 },
+ [18] = { BTN_THUMBL, 1 },
+ [10] = { BTN_THUMBL, 0 },
+ [15] = { BTN_THUMBR, 1 },
+ [25] = { BTN_THUMBR, 0 },
+};
+
+static const struct icade_key *icade_find_translation(u16 from)
+{
+ if (from < 0 || from > ICADE_MAX_USAGE)
+ return NULL;
+ return &icade_usage_table[from];
+}
+
+static int icade_event(struct hid_device *hdev, struct hid_field *field,
+ struct hid_usage *usage, __s32 value)
+{
+ const struct icade_key *trans;
+
+ if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
+ !usage->type)
+ return 0;
+
+ /* We ignore the fake key up, and act only on key down */
+ if (!value)
+ return 1;
+
+ trans = icade_find_translation(usage->hid & HID_USAGE);
+
+ if (!trans)
+ return 1;
+
+ input_event(field->hidinput->input, usage->type,
+ trans->to, trans->press);
+
+ return 1;
+}
+
+static int icade_input_mapping(struct hid_device *hdev, struct hid_input *hi,
+ struct hid_field *field, struct hid_usage *usage,
+ unsigned long **bit, int *max)
+{
+ const struct icade_key *trans;
+
+ if ((usage->hid & HID_USAGE_PAGE) == HID_UP_KEYBOARD) {
+ trans = icade_find_translation(usage->hid & HID_USAGE);
+
+ if (!trans)
+ return -1;
+
+ hid_map_usage(hi, usage, bit, max, EV_KEY, trans->to);
+ set_bit(trans->to, hi->input->keybit);
+
+ return 1;
+ }
+
+ /* ignore others */
+ return -1;
+
+}
+
+static int icade_input_mapped(struct hid_device *hdev, struct hid_input *hi,
+ struct hid_field *field, struct hid_usage *usage,
+ unsigned long **bit, int *max)
+{
+ if (usage->type == EV_KEY)
+ set_bit(usage->type, hi->input->evbit);
+
+ return -1;
+}
+
+static const struct hid_device_id icade_devices[] = {
+ { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ION, USB_DEVICE_ID_ICADE) },
+
+ { }
+};
+MODULE_DEVICE_TABLE(hid, icade_devices);
+
+static struct hid_driver icade_driver = {
+ .name = "icade",
+ .id_table = icade_devices,
+ .event = icade_event,
+ .input_mapped = icade_input_mapped,
+ .input_mapping = icade_input_mapping,
+};
+
+static int __init icade_init(void)
+{
+ int ret;
+
+ ret = hid_register_driver(&icade_driver);
+ if (ret)
+ pr_err("can't register icade driver\n");
+
+ return ret;
+}
+
+static void __exit icade_exit(void)
+{
+ hid_unregister_driver(&icade_driver);
+}
+
+module_init(icade_init);
+module_exit(icade_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");
+MODULE_DESCRIPTION("ION iCade input driver");
projects / mirror_ubuntu-bionic-kernel.git / commitdiff