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Linux/drivers/hid/hid-icade.c

  1 /*
  2  *  ION iCade input driver
  3  *
  4  *  Copyright (c) 2012 Bastien Nocera <hadess@hadess.net>
  5  *  Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
  6  */
  7 
  8 /*
  9  * This program is free software; you can redistribute it and/or modify it
 10  * under the terms of the GNU General Public License as published by the Free
 11  * Software Foundation; either version 2 of the License, or (at your option)
 12  * any later version.
 13  */
 14 
 15 #include <linux/device.h>
 16 #include <linux/hid.h>
 17 #include <linux/module.h>
 18 
 19 #include "hid-ids.h"
 20 
 21 /*
 22  *   ↑      A C Y L
 23  *  ← →
 24  *   ↓      B X Z R
 25  *
 26  *
 27  *  UP ON,OFF  = w,e
 28  *  RT ON,OFF  = d,c
 29  *  DN ON,OFF  = x,z
 30  *  LT ON,OFF  = a,q
 31  *  A  ON,OFF  = y,t
 32  *  B  ON,OFF  = h,r
 33  *  C  ON,OFF  = u,f
 34  *  X  ON,OFF  = j,n
 35  *  Y  ON,OFF  = i,m
 36  *  Z  ON,OFF  = k,p
 37  *  L  ON,OFF  = o,g
 38  *  R  ON,OFF  = l,v
 39  */
 40 
 41 /* The translation code uses HID usage instead of input layer
 42  * keys. This code generates a lookup table that makes
 43  * translation quick.
 44  *
 45  * #include <linux/input.h>
 46  * #include <stdio.h>
 47  * #include <assert.h>
 48  *
 49  * #define unk     KEY_UNKNOWN
 50  *
 51  * < copy of hid_keyboard[] from hid-input.c >
 52  *
 53  * struct icade_key_translation {
 54  *     int         from;
 55  *     const char *to;
 56  *     int         press;
 57  * };
 58  *
 59  * static const struct icade_key_translation icade_keys[] = {
 60  *    { KEY_W,        "KEY_UP",         1 },
 61  *    { KEY_E,        "KEY_UP",         0 },
 62  *    { KEY_D,        "KEY_RIGHT",      1 },
 63  *    { KEY_C,        "KEY_RIGHT",      0 },
 64  *    { KEY_X,        "KEY_DOWN",       1 },
 65  *    { KEY_Z,        "KEY_DOWN",       0 },
 66  *    { KEY_A,        "KEY_LEFT",       1 },
 67  *    { KEY_Q,        "KEY_LEFT",       0 },
 68  *    { KEY_Y,        "BTN_A",          1 },
 69  *    { KEY_T,        "BTN_A",          0 },
 70  *    { KEY_H,        "BTN_B",          1 },
 71  *    { KEY_R,        "BTN_B",          0 },
 72  *    { KEY_U,        "BTN_C",          1 },
 73  *    { KEY_F,        "BTN_C",          0 },
 74  *    { KEY_J,        "BTN_X",          1 },
 75  *    { KEY_N,        "BTN_X",          0 },
 76  *    { KEY_I,        "BTN_Y",          1 },
 77  *    { KEY_M,        "BTN_Y",          0 },
 78  *    { KEY_K,        "BTN_Z",          1 },
 79  *    { KEY_P,        "BTN_Z",          0 },
 80  *    { KEY_O,        "BTN_THUMBL",     1 },
 81  *    { KEY_G,        "BTN_THUMBL",     0 },
 82  *    { KEY_L,        "BTN_THUMBR",     1 },
 83  *    { KEY_V,        "BTN_THUMBR",     0 },
 84  *
 85  *    { }
 86  * };
 87  *
 88  * static int
 89  * usage_for_key (int key)
 90  * {
 91  *     int i;
 92  *     for (i = 0; i < 256; i++) {
 93  *     if (hid_keyboard[i] == key)
 94  *         return i;
 95  *     }
 96  *     assert(0);
 97  * }
 98  *
 99  * int main (int argc, char **argv)
100  * {
101  *     const struct icade_key_translation *trans;
102  *     int max_usage = 0;
103  *
104  *     for (trans = icade_keys; trans->from; trans++) {
105  *         int usage = usage_for_key (trans->from);
106  *         max_usage = usage > max_usage ? usage : max_usage;
107  *     }
108  *
109  *     printf ("#define ICADE_MAX_USAGE %d\n\n", max_usage);
110  *     printf ("struct icade_key {\n");
111  *     printf ("\tu16 to;\n");
112  *     printf ("\tu8 press:1;\n");
113  *     printf ("};\n\n");
114  *     printf ("static const struct icade_key "
115  *             "icade_usage_table[%d] = {\n", max_usage + 1);
116  *     for (trans = icade_keys; trans->from; trans++) {
117  *         printf ("\t[%d] = { %s, %d },\n",
118  *                 usage_for_key (trans->from), trans->to, trans->press);
119  *     }
120  *     printf ("};\n");
121  *
122  *     return 0;
123  * }
124  */
125 
126 #define ICADE_MAX_USAGE 29
127 
128 struct icade_key {
129         u16 to;
130         u8 press:1;
131 };
132 
133 static const struct icade_key icade_usage_table[30] = {
134         [26] = { KEY_UP, 1 },
135         [8] = { KEY_UP, 0 },
136         [7] = { KEY_RIGHT, 1 },
137         [6] = { KEY_RIGHT, 0 },
138         [27] = { KEY_DOWN, 1 },
139         [29] = { KEY_DOWN, 0 },
140         [4] = { KEY_LEFT, 1 },
141         [20] = { KEY_LEFT, 0 },
142         [28] = { BTN_A, 1 },
143         [23] = { BTN_A, 0 },
144         [11] = { BTN_B, 1 },
145         [21] = { BTN_B, 0 },
146         [24] = { BTN_C, 1 },
147         [9] = { BTN_C, 0 },
148         [13] = { BTN_X, 1 },
149         [17] = { BTN_X, 0 },
150         [12] = { BTN_Y, 1 },
151         [16] = { BTN_Y, 0 },
152         [14] = { BTN_Z, 1 },
153         [19] = { BTN_Z, 0 },
154         [18] = { BTN_THUMBL, 1 },
155         [10] = { BTN_THUMBL, 0 },
156         [15] = { BTN_THUMBR, 1 },
157         [25] = { BTN_THUMBR, 0 },
158 };
159 
160 static const struct icade_key *icade_find_translation(u16 from)
161 {
162         if (from > ICADE_MAX_USAGE)
163                 return NULL;
164         return &icade_usage_table[from];
165 }
166 
167 static int icade_event(struct hid_device *hdev, struct hid_field *field,
168                 struct hid_usage *usage, __s32 value)
169 {
170         const struct icade_key *trans;
171 
172         if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
173                         !usage->type)
174                 return 0;
175 
176         /* We ignore the fake key up, and act only on key down */
177         if (!value)
178                 return 1;
179 
180         trans = icade_find_translation(usage->hid & HID_USAGE);
181 
182         if (!trans)
183                 return 1;
184 
185         input_event(field->hidinput->input, usage->type,
186                         trans->to, trans->press);
187 
188         return 1;
189 }
190 
191 static int icade_input_mapping(struct hid_device *hdev, struct hid_input *hi,
192                 struct hid_field *field, struct hid_usage *usage,
193                 unsigned long **bit, int *max)
194 {
195         const struct icade_key *trans;
196 
197         if ((usage->hid & HID_USAGE_PAGE) == HID_UP_KEYBOARD) {
198                 trans = icade_find_translation(usage->hid & HID_USAGE);
199 
200                 if (!trans)
201                         return -1;
202 
203                 hid_map_usage(hi, usage, bit, max, EV_KEY, trans->to);
204                 set_bit(trans->to, hi->input->keybit);
205 
206                 return 1;
207         }
208 
209         /* ignore others */
210         return -1;
211 
212 }
213 
214 static int icade_input_mapped(struct hid_device *hdev, struct hid_input *hi,
215                 struct hid_field *field, struct hid_usage *usage,
216                 unsigned long **bit, int *max)
217 {
218         if (usage->type == EV_KEY)
219                 set_bit(usage->type, hi->input->evbit);
220 
221         return -1;
222 }
223 
224 static const struct hid_device_id icade_devices[] = {
225         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_ION, USB_DEVICE_ID_ICADE) },
226 
227         { }
228 };
229 MODULE_DEVICE_TABLE(hid, icade_devices);
230 
231 static struct hid_driver icade_driver = {
232         .name = "icade",
233         .id_table = icade_devices,
234         .event = icade_event,
235         .input_mapped = icade_input_mapped,
236         .input_mapping = icade_input_mapping,
237 };
238 module_hid_driver(icade_driver);
239 
240 MODULE_LICENSE("GPL");
241 MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");
242 MODULE_DESCRIPTION("ION iCade input driver");
243 

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