1 /* ir-sanyo-decoder.c - handle SANYO IR Pulse/Space protocol 2 * 3 * Copyright (C) 2011 by Mauro Carvalho Chehab 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation version 2 of the License. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * This protocol uses the NEC protocol timings. However, data is formatted as: 15 * 13 bits Custom Code 16 * 13 bits NOT(Custom Code) 17 * 8 bits Key data 18 * 8 bits NOT(Key data) 19 * 20 * According with LIRC, this protocol is used on Sanyo, Aiwa and Chinon 21 * Information for this protocol is available at the Sanyo LC7461 datasheet. 22 */ 23 24 #include <linux/module.h> 25 #include <linux/bitrev.h> 26 #include "rc-core-priv.h" 27 28 #define SANYO_NBITS (13+13+8+8) 29 #define SANYO_UNIT 562500 /* ns */ 30 #define SANYO_HEADER_PULSE (16 * SANYO_UNIT) 31 #define SANYO_HEADER_SPACE (8 * SANYO_UNIT) 32 #define SANYO_BIT_PULSE (1 * SANYO_UNIT) 33 #define SANYO_BIT_0_SPACE (1 * SANYO_UNIT) 34 #define SANYO_BIT_1_SPACE (3 * SANYO_UNIT) 35 #define SANYO_REPEAT_SPACE (150 * SANYO_UNIT) 36 #define SANYO_TRAILER_PULSE (1 * SANYO_UNIT) 37 #define SANYO_TRAILER_SPACE (10 * SANYO_UNIT) /* in fact, 42 */ 38 39 enum sanyo_state { 40 STATE_INACTIVE, 41 STATE_HEADER_SPACE, 42 STATE_BIT_PULSE, 43 STATE_BIT_SPACE, 44 STATE_TRAILER_PULSE, 45 STATE_TRAILER_SPACE, 46 }; 47 48 /** 49 * ir_sanyo_decode() - Decode one SANYO pulse or space 50 * @dev: the struct rc_dev descriptor of the device 51 * @duration: the struct ir_raw_event descriptor of the pulse/space 52 * 53 * This function returns -EINVAL if the pulse violates the state machine 54 */ 55 static int ir_sanyo_decode(struct rc_dev *dev, struct ir_raw_event ev) 56 { 57 struct sanyo_dec *data = &dev->raw->sanyo; 58 u32 scancode; 59 u16 address; 60 u8 command, not_command; 61 62 if (!is_timing_event(ev)) { 63 if (ev.reset) { 64 IR_dprintk(1, "SANYO event reset received. reset to state 0\n"); 65 data->state = STATE_INACTIVE; 66 } 67 return 0; 68 } 69 70 IR_dprintk(2, "SANYO decode started at state %d (%uus %s)\n", 71 data->state, TO_US(ev.duration), TO_STR(ev.pulse)); 72 73 switch (data->state) { 74 75 case STATE_INACTIVE: 76 if (!ev.pulse) 77 break; 78 79 if (eq_margin(ev.duration, SANYO_HEADER_PULSE, SANYO_UNIT / 2)) { 80 data->count = 0; 81 data->state = STATE_HEADER_SPACE; 82 return 0; 83 } 84 break; 85 86 87 case STATE_HEADER_SPACE: 88 if (ev.pulse) 89 break; 90 91 if (eq_margin(ev.duration, SANYO_HEADER_SPACE, SANYO_UNIT / 2)) { 92 data->state = STATE_BIT_PULSE; 93 return 0; 94 } 95 96 break; 97 98 case STATE_BIT_PULSE: 99 if (!ev.pulse) 100 break; 101 102 if (!eq_margin(ev.duration, SANYO_BIT_PULSE, SANYO_UNIT / 2)) 103 break; 104 105 data->state = STATE_BIT_SPACE; 106 return 0; 107 108 case STATE_BIT_SPACE: 109 if (ev.pulse) 110 break; 111 112 if (!data->count && geq_margin(ev.duration, SANYO_REPEAT_SPACE, SANYO_UNIT / 2)) { 113 rc_repeat(dev); 114 IR_dprintk(1, "SANYO repeat last key\n"); 115 data->state = STATE_INACTIVE; 116 return 0; 117 } 118 119 data->bits <<= 1; 120 if (eq_margin(ev.duration, SANYO_BIT_1_SPACE, SANYO_UNIT / 2)) 121 data->bits |= 1; 122 else if (!eq_margin(ev.duration, SANYO_BIT_0_SPACE, SANYO_UNIT / 2)) 123 break; 124 data->count++; 125 126 if (data->count == SANYO_NBITS) 127 data->state = STATE_TRAILER_PULSE; 128 else 129 data->state = STATE_BIT_PULSE; 130 131 return 0; 132 133 case STATE_TRAILER_PULSE: 134 if (!ev.pulse) 135 break; 136 137 if (!eq_margin(ev.duration, SANYO_TRAILER_PULSE, SANYO_UNIT / 2)) 138 break; 139 140 data->state = STATE_TRAILER_SPACE; 141 return 0; 142 143 case STATE_TRAILER_SPACE: 144 if (ev.pulse) 145 break; 146 147 if (!geq_margin(ev.duration, SANYO_TRAILER_SPACE, SANYO_UNIT / 2)) 148 break; 149 150 address = bitrev16((data->bits >> 29) & 0x1fff) >> 3; 151 /* not_address = bitrev16((data->bits >> 16) & 0x1fff) >> 3; */ 152 command = bitrev8((data->bits >> 8) & 0xff); 153 not_command = bitrev8((data->bits >> 0) & 0xff); 154 155 if ((command ^ not_command) != 0xff) { 156 IR_dprintk(1, "SANYO checksum error: received 0x%08Lx\n", 157 data->bits); 158 data->state = STATE_INACTIVE; 159 return 0; 160 } 161 162 scancode = address << 8 | command; 163 IR_dprintk(1, "SANYO scancode: 0x%06x\n", scancode); 164 rc_keydown(dev, RC_PROTO_SANYO, scancode, 0); 165 data->state = STATE_INACTIVE; 166 return 0; 167 } 168 169 IR_dprintk(1, "SANYO decode failed at count %d state %d (%uus %s)\n", 170 data->count, data->state, TO_US(ev.duration), TO_STR(ev.pulse)); 171 data->state = STATE_INACTIVE; 172 return -EINVAL; 173 } 174 175 static const struct ir_raw_timings_pd ir_sanyo_timings = { 176 .header_pulse = SANYO_HEADER_PULSE, 177 .header_space = SANYO_HEADER_SPACE, 178 .bit_pulse = SANYO_BIT_PULSE, 179 .bit_space[0] = SANYO_BIT_0_SPACE, 180 .bit_space[1] = SANYO_BIT_1_SPACE, 181 .trailer_pulse = SANYO_TRAILER_PULSE, 182 .trailer_space = SANYO_TRAILER_SPACE, 183 .msb_first = 1, 184 }; 185 186 /** 187 * ir_sanyo_encode() - Encode a scancode as a stream of raw events 188 * 189 * @protocol: protocol to encode 190 * @scancode: scancode to encode 191 * @events: array of raw ir events to write into 192 * @max: maximum size of @events 193 * 194 * Returns: The number of events written. 195 * -ENOBUFS if there isn't enough space in the array to fit the 196 * encoding. In this case all @max events will have been written. 197 */ 198 static int ir_sanyo_encode(enum rc_proto protocol, u32 scancode, 199 struct ir_raw_event *events, unsigned int max) 200 { 201 struct ir_raw_event *e = events; 202 int ret; 203 u64 raw; 204 205 raw = ((u64)(bitrev16(scancode >> 8) & 0xfff8) << (8 + 8 + 13 - 3)) | 206 ((u64)(bitrev16(~scancode >> 8) & 0xfff8) << (8 + 8 + 0 - 3)) | 207 ((bitrev8(scancode) & 0xff) << 8) | 208 (bitrev8(~scancode) & 0xff); 209 210 ret = ir_raw_gen_pd(&e, max, &ir_sanyo_timings, SANYO_NBITS, raw); 211 if (ret < 0) 212 return ret; 213 214 return e - events; 215 } 216 217 static struct ir_raw_handler sanyo_handler = { 218 .protocols = RC_PROTO_BIT_SANYO, 219 .decode = ir_sanyo_decode, 220 .encode = ir_sanyo_encode, 221 }; 222 223 static int __init ir_sanyo_decode_init(void) 224 { 225 ir_raw_handler_register(&sanyo_handler); 226 227 printk(KERN_INFO "IR SANYO protocol handler initialized\n"); 228 return 0; 229 } 230 231 static void __exit ir_sanyo_decode_exit(void) 232 { 233 ir_raw_handler_unregister(&sanyo_handler); 234 } 235 236 module_init(ir_sanyo_decode_init); 237 module_exit(ir_sanyo_decode_exit); 238 239 MODULE_LICENSE("GPL"); 240 MODULE_AUTHOR("Mauro Carvalho Chehab"); 241 MODULE_AUTHOR("Red Hat Inc. (http://www.redhat.com)"); 242 MODULE_DESCRIPTION("SANYO IR protocol decoder"); 243