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   1 /****************************************************************
   2
   3  Siano Mobile Silicon, Inc.
   4  MDTV receiver kernel modules.
   5  Copyright (C) 2006-2009, Uri Shkolnik
   6
   7  This program is free software: you can redistribute it and/or modify
   8  it under the terms of the GNU General Public License as published by
   9  the Free Software Foundation, either version 2 of the License, or
  10  (at your option) any later version.
  11
  12  This program is distributed in the hope that it will be useful,
  13  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  GNU General Public License for more details.
  16
  17  You should have received a copy of the GNU General Public License
  18  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20  ****************************************************************/
  21
  22
  23 #include <linux/types.h>
  24 #include <linux/input.h>
  25
  26 #include "smscoreapi.h"
  27 #include "smsir.h"
  28 #include "sms-cards.h"
  29
  30 /* In order to add new IR remote control -
  31  * 1) Add it to the <enum ir_kb_type> @ smsir,h,
  32  * 2) Add its map to keyboard_layout_maps below
  33  * 3) Set your board (sms-cards sub-module) to use it
  34  */
  35
  36 static struct keyboard_layout_map_t keyboard_layout_maps[] = {
  37                 [SMS_IR_KB_DEFAULT_TV] = {
  38                         .ir_protocol = IR_RC5,
  39                         .rc5_kbd_address = KEYBOARD_ADDRESS_TV1,
  40                         .keyboard_layout_map = {
  41                                         KEY_0, KEY_1, KEY_2,
  42                                         KEY_3, KEY_4, KEY_5,
  43                                         KEY_6, KEY_7, KEY_8,
  44                                         KEY_9, 0, 0, KEY_POWER,
  45                                         KEY_MUTE, 0, 0,
  46                                         KEY_VOLUMEUP, KEY_VOLUMEDOWN,
  47                                         KEY_BRIGHTNESSUP,
  48                                         KEY_BRIGHTNESSDOWN, KEY_CHANNELUP,
  49                                         KEY_CHANNELDOWN,
  50                                         0, 0, 0, 0, 0, 0, 0, 0,
  51                                         0, 0, 0, 0, 0, 0, 0, 0,
  52                                         0, 0, 0, 0, 0, 0, 0, 0,
  53                                         0, 0, 0, 0, 0, 0, 0, 0,
  54                                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  55                         }
  56                 },
  57                 [SMS_IR_KB_HCW_SILVER] = {
  58                         .ir_protocol = IR_RC5,
  59                         .rc5_kbd_address = KEYBOARD_ADDRESS_LIGHTING1,
  60                         .keyboard_layout_map = {
  61                                         KEY_0, KEY_1, KEY_2,
  62                                         KEY_3, KEY_4, KEY_5,
  63                                         KEY_6, KEY_7, KEY_8,
  64                                         KEY_9, KEY_TEXT, KEY_RED,
  65                                         KEY_RADIO, KEY_MENU,
  66                                         KEY_SUBTITLE,
  67                                         KEY_MUTE, KEY_VOLUMEUP,
  68                                         KEY_VOLUMEDOWN, KEY_PREVIOUS, 0,
  69                                         KEY_UP, KEY_DOWN, KEY_LEFT,
  70                                         KEY_RIGHT, KEY_VIDEO, KEY_AUDIO,
  71                                         KEY_MHP, KEY_EPG, KEY_TV,
  72                                         0, KEY_NEXTSONG, KEY_EXIT,
  73                                         KEY_CHANNELUP,  KEY_CHANNELDOWN,
  74                                         KEY_CHANNEL, 0,
  75                                         KEY_PREVIOUSSONG, KEY_ENTER,
  76                                         KEY_SLEEP, 0, 0, KEY_BLUE,
  77                                         0, 0, 0, 0, KEY_GREEN, 0,
  78                                         KEY_PAUSE, 0, KEY_REWIND,
  79                                         0, KEY_FASTFORWARD, KEY_PLAY,
  80                                         KEY_STOP, KEY_RECORD,
  81                                         KEY_YELLOW, 0, 0, KEY_SELECT,
  82                                         KEY_ZOOM, KEY_POWER, 0, 0
  83                         }
  84                 },
  85                 { } /* Terminating entry */
  86 };
  87
  88 u32 ir_pos;
  89 u32     ir_word;
  90 u32 ir_toggle;
  91
  92 #define RC5_PUSH_BIT(dst, bit, pos)     \
  93         { dst <<= 1; dst |= bit; pos++; }
  94
  95
  96 static void sms_ir_rc5_event(struct smscore_device_t *coredev,
  97                                 u32 toggle, u32 addr, u32 cmd)
  98 {
  99         bool toggle_changed;
 100         u16 keycode;
 101
 102         sms_log("IR RC5 word: address %d, command %d, toggle %d",
 103                                 addr, cmd, toggle);
 104
 105         toggle_changed = ir_toggle != toggle;
 106         /* keep toggle */
 107         ir_toggle = toggle;
 108
 109         if (addr !=
 110                 keyboard_layout_maps[coredev->ir.ir_kb_type].rc5_kbd_address)
 111                 return; /* Check for valid address */
 112
 113         keycode =
 114                 keyboard_layout_maps
 115                 [coredev->ir.ir_kb_type].keyboard_layout_map[cmd];
 116
 117         if (!toggle_changed &&
 118                         (keycode != KEY_VOLUMEUP && keycode != KEY_VOLUMEDOWN))
 119                 return; /* accept only repeated volume, reject other keys */
 120
 121         sms_log("kernel input keycode (from ir) %d", keycode);
 122         input_report_key(coredev->ir.input_dev, keycode, 1);
 123         input_sync(coredev->ir.input_dev);
 124
 125 }
 126
 127 /* decode raw bit pattern to RC5 code */
 128 /* taken from ir-functions.c */
 129 static u32 ir_rc5_decode(unsigned int code)
 130 {
 131 /*      unsigned int org_code = code;*/
 132         unsigned int pair;
 133         unsigned int rc5 = 0;
 134         int i;
 135
 136         for (i = 0; i < 14; ++i) {
 137                 pair = code & 0x3;
 138                 code >>= 2;
 139
 140                 rc5 <<= 1;
 141                 switch (pair) {
 142                 case 0:
 143                 case 2:
 144                         break;
 145                 case 1:
 146                         rc5 |= 1;
 147                         break;
 148                 case 3:
 149 /*      dprintk(1, "ir-common: ir_rc5_decode(%x) bad code\n", org_code);*/
 150                         sms_log("bad code");
 151                         return 0;
 152                 }
 153         }
 154 /*
 155         dprintk(1, "ir-common: code=%x, rc5=%x, start=%x,
 156                 toggle=%x, address=%x, "
 157                 "instr=%x\n", rc5, org_code, RC5_START(rc5),
 158                 RC5_TOGGLE(rc5), RC5_ADDR(rc5), RC5_INSTR(rc5));
 159 */
 160         return rc5;
 161 }
 162
 163 static void sms_rc5_parse_word(struct smscore_device_t *coredev)
 164 {
 165         #define RC5_START(x)    (((x)>>12)&3)
 166         #define RC5_TOGGLE(x)   (((x)>>11)&1)
 167         #define RC5_ADDR(x)     (((x)>>6)&0x1F)
 168         #define RC5_INSTR(x)    ((x)&0x3F)
 169
 170         int i, j;
 171         u32 rc5_word = 0;
 172
 173         /* Reverse the IR word direction */
 174         for (i = 0 ; i < 28 ; i++)
 175                 RC5_PUSH_BIT(rc5_word, (ir_word>>i)&1, j)
 176
 177         rc5_word = ir_rc5_decode(rc5_word);
 178         /* sms_log("temp = 0x%x, rc5_code = 0x%x", ir_word, rc5_word); */
 179
 180         sms_ir_rc5_event(coredev,
 181                                 RC5_TOGGLE(rc5_word),
 182                                 RC5_ADDR(rc5_word),
 183                                 RC5_INSTR(rc5_word));
 184 }
 185
 186
 187 static void sms_rc5_accumulate_bits(struct smscore_device_t *coredev,
 188                 s32 ir_sample)
 189 {
 190         #define RC5_TIME_GRANULARITY    200
 191         #define RC5_DEF_BIT_TIME                889
 192         #define RC5_MAX_SAME_BIT_CONT   4
 193         #define RC5_WORD_LEN                    27 /* 28 bit */
 194
 195         u32 i, j;
 196         s32 delta_time;
 197         u32 time = (ir_sample > 0) ? ir_sample : (0-ir_sample);
 198         u32 level = (ir_sample < 0) ? 0 : 1;
 199
 200         for (i = RC5_MAX_SAME_BIT_CONT; i > 0; i--) {
 201                 delta_time = time - (i*RC5_DEF_BIT_TIME) + RC5_TIME_GRANULARITY;
 202                 if (delta_time < 0)
 203                         continue; /* not so many consecutive bits */
 204                 if (delta_time > (2 * RC5_TIME_GRANULARITY)) {
 205                         /* timeout */
 206                         if (ir_pos == (RC5_WORD_LEN-1))
 207                                 /* complete last bit */
 208                                 RC5_PUSH_BIT(ir_word, level, ir_pos)
 209
 210                         if (ir_pos == RC5_WORD_LEN)
 211                                 sms_rc5_parse_word(coredev);
 212                         else if (ir_pos) /* timeout within a word */
 213                                 sms_log("IR error parsing a word");
 214
 215                         ir_pos = 0;
 216                         ir_word = 0;
 217                         /* sms_log("timeout %d", time); */
 218                         break;
 219                 }
 220                 /* The time is within the range of this number of bits */
 221                 for (j = 0 ; j < i ; j++)
 222                         RC5_PUSH_BIT(ir_word, level, ir_pos)
 223
 224                 break;
 225         }
 226 }
 227
 228 void sms_ir_event(struct smscore_device_t *coredev, const char *buf, int len)
 229 {
 230         #define IR_DATA_RECEIVE_MAX_LEN 520 /* 128*4 + 4 + 4 */
 231         u32 i;
 232         enum ir_protocol ir_protocol =
 233                         keyboard_layout_maps[coredev->ir.ir_kb_type]
 234                                              .ir_protocol;
 235         s32 *samples;
 236         int count = len>>2;
 237
 238         samples = (s32 *)buf;
 239 /*      sms_log("IR buffer received, length = %d", count);*/
 240
 241         for (i = 0; i < count; i++)
 242                 if (ir_protocol == IR_RC5)
 243                         sms_rc5_accumulate_bits(coredev, samples[i]);
 244         /*  IR_RCMM not implemented */
 245 }
 246
 247 int sms_ir_init(struct smscore_device_t *coredev)
 248 {
 249         struct input_dev *input_dev;
 250
 251         sms_log("Allocating input device");
 252         input_dev = input_allocate_device();
 253         if (!input_dev) {
 254                 sms_err("Not enough memory");
 255                 return -ENOMEM;
 256         }
 257
 258         coredev->ir.input_dev = input_dev;
 259         coredev->ir.ir_kb_type =
 260                 sms_get_board(smscore_get_board_id(coredev))->ir_kb_type;
 261         coredev->ir.keyboard_layout_map =
 262                 keyboard_layout_maps[coredev->ir.ir_kb_type].
 263                                 keyboard_layout_map;
 264         sms_log("IR remote keyboard type is %d", coredev->ir.ir_kb_type);
 265
 266         coredev->ir.controller = 0;     /* Todo: vega/nova SPI number */
 267         coredev->ir.timeout = IR_DEFAULT_TIMEOUT;
 268         sms_log("IR port %d, timeout %d ms",
 269                         coredev->ir.controller, coredev->ir.timeout);
 270
 271         snprintf(coredev->ir.name,
 272                                 IR_DEV_NAME_MAX_LEN,
 273                                 "SMS IR w/kbd type %d",
 274                                 coredev->ir.ir_kb_type);
 275         input_dev->name = coredev->ir.name;
 276         input_dev->phys = coredev->ir.name;
 277         input_dev->dev.parent = coredev->device;
 278
 279         /* Key press events only */
 280         input_dev->evbit[0] = BIT_MASK(EV_KEY);
 281         input_dev->keybit[BIT_WORD(BTN_0)] = BIT_MASK(BTN_0);
 282
 283         sms_log("Input device (IR) %s is set for key events", input_dev->name);
 284
 285         if (input_register_device(input_dev)) {
 286                 sms_err("Failed to register device");
 287                 input_free_device(input_dev);
 288                 return -EACCES;
 289         }
 290
 291         return 0;
 292 }
 293
 294 void sms_ir_exit(struct smscore_device_t *coredev)
 295 {
 296         if (coredev->ir.input_dev)
 297                 input_unregister_device(coredev->ir.input_dev);
 298
 299         sms_log("");
 300 }
 301