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 /* do nothing if device is disconnected */ 133 if (ir->dev->dev_state == DEV_DISCONNECTED) 134 return 0; 135 136 /* Check IR int */ 137 rc = au8522_rc_read(ir, 0xe1, -1, buf, 1); 138 if (rc < 0 || !(buf[0] & (1 << 4))) { 139 /* Be sure that IR is enabled */ 140 au8522_rc_set(ir, 0xe0, 1 << 4); 141 return 0; 142 } 143 144 /* Something arrived. Get the data */ 145 rc = au8522_rc_read(ir, 0xe3, 0x11, buf, sizeof(buf)); 146 147 148 if (rc < 0) 149 return rc; 150 151 /* Disable IR */ 152 au8522_rc_clear(ir, 0xe0, 1 << 4); 153 154 /* Enable IR */ 155 au8522_rc_set(ir, 0xe0, 1 << 4); 156 157 dprintk(16, "RC data received: %*ph\n", 40, buf); 158 159 prv_bit = (buf[0] >> 7) & 0x01; 160 width = 0; 161 for (i = 0; i < sizeof(buf); i++) { 162 for (j = 7; j >= 0; j--) { 163 bit = (buf[i] >> j) & 0x01; 164 if (bit == prv_bit) { 165 width++; 166 continue; 167 } 168 169 /* 170 * Fix an au8522 bug: the first pulse event 171 * is lost. So, we need to fake it, based on the 172 * protocol. That means that not all raw decoders 173 * will work, as we need to add a hack for each 174 * protocol, based on the first space. 175 * So, we only support RC5 and NEC. 176 */ 177 178 if (first) { 179 first = false; 180 181 init_ir_raw_event(&rawir); 182 rawir.pulse = true; 183 if (width > NEC_START_SPACE - 2 && 184 width < NEC_START_SPACE + 2) { 185 /* NEC protocol */ 186 rawir.duration = NEC_START_PULSE; 187 dprintk(16, "Storing NEC start %s with duration %d", 188 rawir.pulse ? "pulse" : "space", 189 rawir.duration); 190 } else { 191 /* RC5 protocol */ 192 rawir.duration = RC5_START_PULSE; 193 dprintk(16, "Storing RC5 start %s with duration %d", 194 rawir.pulse ? "pulse" : "space", 195 rawir.duration); 196 } 197 ir_raw_event_store(ir->rc, &rawir); 198 } 199 200 init_ir_raw_event(&rawir); 201 rawir.pulse = prv_bit ? false : true; 202 rawir.duration = AU8522_UNIT * width; 203 dprintk(16, "Storing %s with duration %d", 204 rawir.pulse ? "pulse" : "space", 205 rawir.duration); 206 ir_raw_event_store(ir->rc, &rawir); 207 208 width = 1; 209 prv_bit = bit; 210 } 211 } 212 213 init_ir_raw_event(&rawir); 214 rawir.pulse = prv_bit ? false : true; 215 rawir.duration = AU8522_UNIT * width; 216 dprintk(16, "Storing end %s with duration %d", 217 rawir.pulse ? "pulse" : "space", 218 rawir.duration); 219 ir_raw_event_store(ir->rc, &rawir); 220 221 ir_raw_event_handle(ir->rc); 222 223 return 1; 224 } 225 226 /* 227 * Generic IR code 228 */ 229 230 static void au0828_rc_work(struct work_struct *work) 231 { 232 struct au0828_rc *ir = container_of(work, struct au0828_rc, work.work); 233 int rc; 234 235 rc = ir->get_key_i2c(ir); 236 if (rc < 0) 237 pr_info("Error while getting RC scancode\n"); 238 239 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); 240 } 241 242 static int au0828_rc_start(struct rc_dev *rc) 243 { 244 struct au0828_rc *ir = rc->priv; 245 246 INIT_DELAYED_WORK(&ir->work, au0828_rc_work); 247 248 /* Enable IR */ 249 au8522_rc_set(ir, 0xe0, 1 << 4); 250 251 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); 252 253 return 0; 254 } 255 256 static void au0828_rc_stop(struct rc_dev *rc) 257 { 258 struct au0828_rc *ir = rc->priv; 259 260 cancel_delayed_work_sync(&ir->work); 261 262 /* do nothing if device is disconnected */ 263 if (ir->dev->dev_state != DEV_DISCONNECTED) { 264 /* Disable IR */ 265 au8522_rc_clear(ir, 0xe0, 1 << 4); 266 } 267 } 268 269 static int au0828_probe_i2c_ir(struct au0828_dev *dev) 270 { 271 int i = 0; 272 const unsigned short addr_list[] = { 273 0x47, I2C_CLIENT_END 274 }; 275 276 while (addr_list[i] != I2C_CLIENT_END) { 277 if (i2c_probe_func_quick_read(dev->i2c_client.adapter, 278 addr_list[i]) == 1) 279 return addr_list[i]; 280 i++; 281 } 282 283 return -ENODEV; 284 } 285 286 int au0828_rc_register(struct au0828_dev *dev) 287 { 288 struct au0828_rc *ir; 289 struct rc_dev *rc; 290 int err = -ENOMEM; 291 u16 i2c_rc_dev_addr = 0; 292 293 if (!dev->board.has_ir_i2c || disable_ir) 294 return 0; 295 296 i2c_rc_dev_addr = au0828_probe_i2c_ir(dev); 297 if (!i2c_rc_dev_addr) 298 return -ENODEV; 299 300 ir = kzalloc(sizeof(*ir), GFP_KERNEL); 301 rc = rc_allocate_device(); 302 if (!ir || !rc) 303 goto error; 304 305 /* record handles to ourself */ 306 ir->dev = dev; 307 dev->ir = ir; 308 ir->rc = rc; 309 310 rc->priv = ir; 311 rc->open = au0828_rc_start; 312 rc->close = au0828_rc_stop; 313 314 if (dev->board.has_ir_i2c) { /* external i2c device */ 315 switch (dev->boardnr) { 316 case AU0828_BOARD_HAUPPAUGE_HVR950Q: 317 rc->map_name = RC_MAP_HAUPPAUGE; 318 ir->get_key_i2c = au0828_get_key_au8522; 319 break; 320 default: 321 err = -ENODEV; 322 goto error; 323 } 324 325 ir->i2c_dev_addr = i2c_rc_dev_addr; 326 } 327 328 /* This is how often we ask the chip for IR information */ 329 ir->polling = 100; /* ms */ 330 331 /* init input device */ 332 snprintf(ir->name, sizeof(ir->name), "au0828 IR (%s)", 333 dev->board.name); 334 335 usb_make_path(dev->usbdev, ir->phys, sizeof(ir->phys)); 336 strlcat(ir->phys, "/input0", sizeof(ir->phys)); 337 338 rc->input_name = ir->name; 339 rc->input_phys = ir->phys; 340 rc->input_id.bustype = BUS_USB; 341 rc->input_id.version = 1; 342 rc->input_id.vendor = le16_to_cpu(dev->usbdev->descriptor.idVendor); 343 rc->input_id.product = le16_to_cpu(dev->usbdev->descriptor.idProduct); 344 rc->dev.parent = &dev->usbdev->dev; 345 rc->driver_name = "au0828-input"; 346 rc->driver_type = RC_DRIVER_IR_RAW; 347 rc->allowed_protocols = RC_BIT_NEC | RC_BIT_RC5; 348 349 /* all done */ 350 err = rc_register_device(rc); 351 if (err) 352 goto error; 353 354 pr_info("Remote controller %s initalized\n", ir->name); 355 356 return 0; 357 358 error: 359 dev->ir = NULL; 360 rc_free_device(rc); 361 kfree(ir); 362 return err; 363 } 364 365 void au0828_rc_unregister(struct au0828_dev *dev) 366 { 367 struct au0828_rc *ir = dev->ir; 368 369 /* skip detach on non attached boards */ 370 if (!ir) 371 return; 372 373 rc_unregister_device(ir->rc); 374 375 /* done */ 376 kfree(ir); 377 dev->ir = NULL; 378 } 379 380 int au0828_rc_suspend(struct au0828_dev *dev) 381 { 382 struct au0828_rc *ir = dev->ir; 383 384 if (!ir) 385 return 0; 386 387 pr_info("Stopping RC\n"); 388 389 cancel_delayed_work_sync(&ir->work); 390 391 /* Disable IR */ 392 au8522_rc_clear(ir, 0xe0, 1 << 4); 393 394 return 0; 395 } 396 397 int au0828_rc_resume(struct au0828_dev *dev) 398 { 399 struct au0828_rc *ir = dev->ir; 400 401 if (!ir) 402 return 0; 403 404 pr_info("Restarting RC\n"); 405 406 /* Enable IR */ 407 au8522_rc_set(ir, 0xe0, 1 << 4); 408 409 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); 410 411 return 0; 412 } 413