1 /* 2 handle au0828 IR remotes via linux kernel input layer. 3 4 Copyright (C) 2014 Mauro Carvalho Chehab <mchehab@samsung.com> 5 Copyright (c) 2014 Samsung Electronics Co., Ltd. 6 7 Based on em28xx-input.c. 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 2 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 */ 19 20 #include "au0828.h" 21 22 #include <linux/module.h> 23 #include <linux/init.h> 24 #include <linux/delay.h> 25 #include <linux/interrupt.h> 26 #include <linux/usb.h> 27 #include <linux/slab.h> 28 #include <media/rc-core.h> 29 30 static int disable_ir; 31 module_param(disable_ir, int, 0444); 32 MODULE_PARM_DESC(disable_ir, "disable infrared remote support"); 33 34 struct au0828_rc { 35 struct au0828_dev *dev; 36 struct rc_dev *rc; 37 char name[32]; 38 char phys[32]; 39 40 /* poll decoder */ 41 int polling; 42 struct delayed_work work; 43 44 /* i2c slave address of external device (if used) */ 45 u16 i2c_dev_addr; 46 47 int (*get_key_i2c)(struct au0828_rc *ir); 48 }; 49 50 /* 51 * AU8522 has a builtin IR receiver. Add functions to get IR from it 52 */ 53 54 static int au8522_rc_write(struct au0828_rc *ir, u16 reg, u8 data) 55 { 56 int rc; 57 char buf[] = { (reg >> 8) | 0x80, reg & 0xff, data }; 58 struct i2c_msg msg = { .addr = ir->i2c_dev_addr, .flags = 0, 59 .buf = buf, .len = sizeof(buf) }; 60 61 rc = i2c_transfer(ir->dev->i2c_client.adapter, &msg, 1); 62 63 if (rc < 0) 64 return rc; 65 66 return (rc == 1) ? 0 : -EIO; 67 } 68 69 static int au8522_rc_read(struct au0828_rc *ir, u16 reg, int val, 70 char *buf, int size) 71 { 72 int rc; 73 char obuf[3]; 74 struct i2c_msg msg[2] = { { .addr = ir->i2c_dev_addr, .flags = 0, 75 .buf = obuf, .len = 2 }, 76 { .addr = ir->i2c_dev_addr, .flags = I2C_M_RD, 77 .buf = buf, .len = size } }; 78 79 obuf[0] = 0x40 | reg >> 8; 80 obuf[1] = reg & 0xff; 81 if (val >= 0) { 82 obuf[2] = val; 83 msg[0].len++; 84 } 85 86 rc = i2c_transfer(ir->dev->i2c_client.adapter, msg, 2); 87 88 if (rc < 0) 89 return rc; 90 91 return (rc == 2) ? 0 : -EIO; 92 } 93 94 static int au8522_rc_andor(struct au0828_rc *ir, u16 reg, u8 mask, u8 value) 95 { 96 int rc; 97 char buf, oldbuf; 98 99 rc = au8522_rc_read(ir, reg, -1, &buf, 1); 100 if (rc < 0) 101 return rc; 102 103 oldbuf = buf; 104 buf = (buf & ~mask) | (value & mask); 105 106 /* Nothing to do, just return */ 107 if (buf == oldbuf) 108 return 0; 109 110 return au8522_rc_write(ir, reg, buf); 111 } 112 113 #define au8522_rc_set(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), (bit)) 114 #define au8522_rc_clear(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), 0) 115 116 /* Remote Controller time units */ 117 118 #define AU8522_UNIT 200000 /* ns */ 119 #define NEC_START_SPACE (4500000 / AU8522_UNIT) 120 #define NEC_START_PULSE (562500 * 16) 121 #define RC5_START_SPACE (4 * AU8522_UNIT) 122 #define RC5_START_PULSE 888888 123 124 static int au0828_get_key_au8522(struct au0828_rc *ir) 125 { 126 unsigned char buf[40]; 127 DEFINE_IR_RAW_EVENT(rawir); 128 int i, j, rc; 129 int prv_bit, bit, width; 130 bool first = true; 131 132 /* Check IR int */ 133 rc = au8522_rc_read(ir, 0xe1, -1, buf, 1); 134 if (rc < 0 || !(buf[0] & (1 << 4))) { 135 /* Be sure that IR is enabled */ 136 au8522_rc_set(ir, 0xe0, 1 << 4); 137 return 0; 138 } 139 140 /* Something arrived. Get the data */ 141 rc = au8522_rc_read(ir, 0xe3, 0x11, buf, sizeof(buf)); 142 143 144 if (rc < 0) 145 return rc; 146 147 /* Disable IR */ 148 au8522_rc_clear(ir, 0xe0, 1 << 4); 149 150 /* Enable IR */ 151 au8522_rc_set(ir, 0xe0, 1 << 4); 152 153 dprintk(16, "RC data received: %*ph\n", 40, buf); 154 155 prv_bit = (buf[0] >> 7) & 0x01; 156 width = 0; 157 for (i = 0; i < sizeof(buf); i++) { 158 for (j = 7; j >= 0; j--) { 159 bit = (buf[i] >> j) & 0x01; 160 if (bit == prv_bit) { 161 width++; 162 continue; 163 } 164 165 /* 166 * Fix an au8522 bug: the first pulse event 167 * is lost. So, we need to fake it, based on the 168 * protocol. That means that not all raw decoders 169 * will work, as we need to add a hack for each 170 * protocol, based on the first space. 171 * So, we only support RC5 and NEC. 172 */ 173 174 if (first) { 175 first = false; 176 177 init_ir_raw_event(&rawir); 178 rawir.pulse = true; 179 if (width > NEC_START_SPACE - 2 && 180 width < NEC_START_SPACE + 2) { 181 /* NEC protocol */ 182 rawir.duration = NEC_START_PULSE; 183 dprintk(16, "Storing NEC start %s with duration %d", 184 rawir.pulse ? "pulse" : "space", 185 rawir.duration); 186 } else { 187 /* RC5 protocol */ 188 rawir.duration = RC5_START_PULSE; 189 dprintk(16, "Storing RC5 start %s with duration %d", 190 rawir.pulse ? "pulse" : "space", 191 rawir.duration); 192 } 193 ir_raw_event_store(ir->rc, &rawir); 194 } 195 196 init_ir_raw_event(&rawir); 197 rawir.pulse = prv_bit ? false : true; 198 rawir.duration = AU8522_UNIT * width; 199 dprintk(16, "Storing %s with duration %d", 200 rawir.pulse ? "pulse" : "space", 201 rawir.duration); 202 ir_raw_event_store(ir->rc, &rawir); 203 204 width = 1; 205 prv_bit = bit; 206 } 207 } 208 209 init_ir_raw_event(&rawir); 210 rawir.pulse = prv_bit ? false : true; 211 rawir.duration = AU8522_UNIT * width; 212 dprintk(16, "Storing end %s with duration %d", 213 rawir.pulse ? "pulse" : "space", 214 rawir.duration); 215 ir_raw_event_store(ir->rc, &rawir); 216 217 ir_raw_event_handle(ir->rc); 218 219 return 1; 220 } 221 222 /* 223 * Generic IR code 224 */ 225 226 static void au0828_rc_work(struct work_struct *work) 227 { 228 struct au0828_rc *ir = container_of(work, struct au0828_rc, work.work); 229 int rc; 230 231 rc = ir->get_key_i2c(ir); 232 if (rc < 0) 233 pr_info("Error while getting RC scancode\n"); 234 235 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); 236 } 237 238 static int au0828_rc_start(struct rc_dev *rc) 239 { 240 struct au0828_rc *ir = rc->priv; 241 242 INIT_DELAYED_WORK(&ir->work, au0828_rc_work); 243 244 /* Enable IR */ 245 au8522_rc_set(ir, 0xe0, 1 << 4); 246 247 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); 248 249 return 0; 250 } 251 252 static void au0828_rc_stop(struct rc_dev *rc) 253 { 254 struct au0828_rc *ir = rc->priv; 255 256 cancel_delayed_work_sync(&ir->work); 257 258 /* Disable IR */ 259 au8522_rc_clear(ir, 0xe0, 1 << 4); 260 } 261 262 static int au0828_probe_i2c_ir(struct au0828_dev *dev) 263 { 264 int i = 0; 265 const unsigned short addr_list[] = { 266 0x47, I2C_CLIENT_END 267 }; 268 269 while (addr_list[i] != I2C_CLIENT_END) { 270 if (i2c_probe_func_quick_read(dev->i2c_client.adapter, 271 addr_list[i]) == 1) 272 return addr_list[i]; 273 i++; 274 } 275 276 return -ENODEV; 277 } 278 279 int au0828_rc_register(struct au0828_dev *dev) 280 { 281 struct au0828_rc *ir; 282 struct rc_dev *rc; 283 int err = -ENOMEM; 284 u16 i2c_rc_dev_addr = 0; 285 286 if (!dev->board.has_ir_i2c || disable_ir) 287 return 0; 288 289 i2c_rc_dev_addr = au0828_probe_i2c_ir(dev); 290 if (!i2c_rc_dev_addr) 291 return -ENODEV; 292 293 ir = kzalloc(sizeof(*ir), GFP_KERNEL); 294 rc = rc_allocate_device(); 295 if (!ir || !rc) 296 goto error; 297 298 /* record handles to ourself */ 299 ir->dev = dev; 300 dev->ir = ir; 301 ir->rc = rc; 302 303 rc->priv = ir; 304 rc->open = au0828_rc_start; 305 rc->close = au0828_rc_stop; 306 307 if (dev->board.has_ir_i2c) { /* external i2c device */ 308 switch (dev->boardnr) { 309 case AU0828_BOARD_HAUPPAUGE_HVR950Q: 310 rc->map_name = RC_MAP_HAUPPAUGE; 311 ir->get_key_i2c = au0828_get_key_au8522; 312 break; 313 default: 314 err = -ENODEV; 315 goto error; 316 } 317 318 ir->i2c_dev_addr = i2c_rc_dev_addr; 319 } 320 321 /* This is how often we ask the chip for IR information */ 322 ir->polling = 100; /* ms */ 323 324 /* init input device */ 325 snprintf(ir->name, sizeof(ir->name), "au0828 IR (%s)", 326 dev->board.name); 327 328 usb_make_path(dev->usbdev, ir->phys, sizeof(ir->phys)); 329 strlcat(ir->phys, "/input0", sizeof(ir->phys)); 330 331 rc->input_name = ir->name; 332 rc->input_phys = ir->phys; 333 rc->input_id.bustype = BUS_USB; 334 rc->input_id.version = 1; 335 rc->input_id.vendor = le16_to_cpu(dev->usbdev->descriptor.idVendor); 336 rc->input_id.product = le16_to_cpu(dev->usbdev->descriptor.idProduct); 337 rc->dev.parent = &dev->usbdev->dev; 338 rc->driver_name = "au0828-input"; 339 rc->driver_type = RC_DRIVER_IR_RAW; 340 rc->allowed_protocols = RC_BIT_NEC | RC_BIT_RC5; 341 342 /* all done */ 343 err = rc_register_device(rc); 344 if (err) 345 goto error; 346 347 pr_info("Remote controller %s initalized\n", ir->name); 348 349 return 0; 350 351 error: 352 dev->ir = NULL; 353 rc_free_device(rc); 354 kfree(ir); 355 return err; 356 } 357 358 void au0828_rc_unregister(struct au0828_dev *dev) 359 { 360 struct au0828_rc *ir = dev->ir; 361 362 /* skip detach on non attached boards */ 363 if (!ir) 364 return; 365 366 if (ir->rc) 367 rc_unregister_device(ir->rc); 368 369 /* done */ 370 kfree(ir); 371 dev->ir = NULL; 372 } 373 374 int au0828_rc_suspend(struct au0828_dev *dev) 375 { 376 struct au0828_rc *ir = dev->ir; 377 378 if (!ir) 379 return 0; 380 381 pr_info("Stopping RC\n"); 382 383 cancel_delayed_work_sync(&ir->work); 384 385 /* Disable IR */ 386 au8522_rc_clear(ir, 0xe0, 1 << 4); 387 388 return 0; 389 } 390 391 int au0828_rc_resume(struct au0828_dev *dev) 392 { 393 struct au0828_rc *ir = dev->ir; 394 395 if (!ir) 396 return 0; 397 398 pr_info("Restarting RC\n"); 399 400 /* Enable IR */ 401 au8522_rc_set(ir, 0xe0, 1 << 4); 402 403 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); 404 405 return 0; 406 } 407