1 // SPDX-License-Identifier: GPL-2.0+ 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 #include "au0828.h" 10 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/delay.h> 14 #include <linux/interrupt.h> 15 #include <linux/usb.h> 16 #include <linux/slab.h> 17 #include <media/rc-core.h> 18 19 static int disable_ir; 20 module_param(disable_ir, int, 0444); 21 MODULE_PARM_DESC(disable_ir, "disable infrared remote support"); 22 23 struct au0828_rc { 24 struct au0828_dev *dev; 25 struct rc_dev *rc; 26 char name[32]; 27 char phys[32]; 28 29 /* poll decoder */ 30 int polling; 31 struct delayed_work work; 32 33 /* i2c slave address of external device (if used) */ 34 u16 i2c_dev_addr; 35 36 int (*get_key_i2c)(struct au0828_rc *ir); 37 }; 38 39 /* 40 * AU8522 has a builtin IR receiver. Add functions to get IR from it 41 */ 42 43 static int au8522_rc_write(struct au0828_rc *ir, u16 reg, u8 data) 44 { 45 int rc; 46 char buf[] = { (reg >> 8) | 0x80, reg & 0xff, data }; 47 struct i2c_msg msg = { .addr = ir->i2c_dev_addr, .flags = 0, 48 .buf = buf, .len = sizeof(buf) }; 49 50 rc = i2c_transfer(ir->dev->i2c_client.adapter, &msg, 1); 51 52 if (rc < 0) 53 return rc; 54 55 return (rc == 1) ? 0 : -EIO; 56 } 57 58 static int au8522_rc_read(struct au0828_rc *ir, u16 reg, int val, 59 char *buf, int size) 60 { 61 int rc; 62 char obuf[3]; 63 struct i2c_msg msg[2] = { { .addr = ir->i2c_dev_addr, .flags = 0, 64 .buf = obuf, .len = 2 }, 65 { .addr = ir->i2c_dev_addr, .flags = I2C_M_RD, 66 .buf = buf, .len = size } }; 67 68 obuf[0] = 0x40 | reg >> 8; 69 obuf[1] = reg & 0xff; 70 if (val >= 0) { 71 obuf[2] = val; 72 msg[0].len++; 73 } 74 75 rc = i2c_transfer(ir->dev->i2c_client.adapter, msg, 2); 76 77 if (rc < 0) 78 return rc; 79 80 return (rc == 2) ? 0 : -EIO; 81 } 82 83 static int au8522_rc_andor(struct au0828_rc *ir, u16 reg, u8 mask, u8 value) 84 { 85 int rc; 86 char buf, oldbuf; 87 88 rc = au8522_rc_read(ir, reg, -1, &buf, 1); 89 if (rc < 0) 90 return rc; 91 92 oldbuf = buf; 93 buf = (buf & ~mask) | (value & mask); 94 95 /* Nothing to do, just return */ 96 if (buf == oldbuf) 97 return 0; 98 99 return au8522_rc_write(ir, reg, buf); 100 } 101 102 #define au8522_rc_set(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), (bit)) 103 #define au8522_rc_clear(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), 0) 104 105 /* Remote Controller time units */ 106 107 #define AU8522_UNIT 200 /* us */ 108 #define NEC_START_SPACE (4500 / AU8522_UNIT) 109 #define NEC_START_PULSE (563 * 16) 110 #define RC5_START_SPACE (4 * AU8522_UNIT) 111 #define RC5_START_PULSE 889 112 113 static int au0828_get_key_au8522(struct au0828_rc *ir) 114 { 115 unsigned char buf[40]; 116 struct ir_raw_event rawir = {}; 117 int i, j, rc; 118 int prv_bit, bit, width; 119 bool first = true; 120 121 /* do nothing if device is disconnected */ 122 if (test_bit(DEV_DISCONNECTED, &ir->dev->dev_state)) 123 return 0; 124 125 /* Check IR int */ 126 rc = au8522_rc_read(ir, 0xe1, -1, buf, 1); 127 if (rc < 0 || !(buf[0] & (1 << 4))) { 128 /* Be sure that IR is enabled */ 129 au8522_rc_set(ir, 0xe0, 1 << 4); 130 return 0; 131 } 132 133 /* Something arrived. Get the data */ 134 rc = au8522_rc_read(ir, 0xe3, 0x11, buf, sizeof(buf)); 135 136 137 if (rc < 0) 138 return rc; 139 140 /* Disable IR */ 141 au8522_rc_clear(ir, 0xe0, 1 << 4); 142 143 /* Enable IR */ 144 au8522_rc_set(ir, 0xe0, 1 << 4); 145 146 dprintk(16, "RC data received: %*ph\n", 40, buf); 147 148 prv_bit = (buf[0] >> 7) & 0x01; 149 width = 0; 150 for (i = 0; i < sizeof(buf); i++) { 151 for (j = 7; j >= 0; j--) { 152 bit = (buf[i] >> j) & 0x01; 153 if (bit == prv_bit) { 154 width++; 155 continue; 156 } 157 158 /* 159 * Fix an au8522 bug: the first pulse event 160 * is lost. So, we need to fake it, based on the 161 * protocol. That means that not all raw decoders 162 * will work, as we need to add a hack for each 163 * protocol, based on the first space. 164 * So, we only support RC5 and NEC. 165 */ 166 167 if (first) { 168 first = false; 169 170 rawir.pulse = true; 171 if (width > NEC_START_SPACE - 2 && 172 width < NEC_START_SPACE + 2) { 173 /* NEC protocol */ 174 rawir.duration = NEC_START_PULSE; 175 dprintk(16, "Storing NEC start %s with duration %d", 176 rawir.pulse ? "pulse" : "space", 177 rawir.duration); 178 } else { 179 /* RC5 protocol */ 180 rawir.duration = RC5_START_PULSE; 181 dprintk(16, "Storing RC5 start %s with duration %d", 182 rawir.pulse ? "pulse" : "space", 183 rawir.duration); 184 } 185 ir_raw_event_store(ir->rc, &rawir); 186 } 187 188 rawir.pulse = prv_bit ? false : true; 189 rawir.duration = AU8522_UNIT * width; 190 dprintk(16, "Storing %s with duration %d", 191 rawir.pulse ? "pulse" : "space", 192 rawir.duration); 193 ir_raw_event_store(ir->rc, &rawir); 194 195 width = 1; 196 prv_bit = bit; 197 } 198 } 199 200 rawir.pulse = prv_bit ? false : true; 201 rawir.duration = AU8522_UNIT * width; 202 dprintk(16, "Storing end %s with duration %d", 203 rawir.pulse ? "pulse" : "space", 204 rawir.duration); 205 ir_raw_event_store(ir->rc, &rawir); 206 207 ir_raw_event_handle(ir->rc); 208 209 return 1; 210 } 211 212 /* 213 * Generic IR code 214 */ 215 216 static void au0828_rc_work(struct work_struct *work) 217 { 218 struct au0828_rc *ir = container_of(work, struct au0828_rc, work.work); 219 int rc; 220 221 rc = ir->get_key_i2c(ir); 222 if (rc < 0) 223 pr_info("Error while getting RC scancode\n"); 224 225 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); 226 } 227 228 static int au0828_rc_start(struct rc_dev *rc) 229 { 230 struct au0828_rc *ir = rc->priv; 231 232 INIT_DELAYED_WORK(&ir->work, au0828_rc_work); 233 234 /* Enable IR */ 235 au8522_rc_set(ir, 0xe0, 1 << 4); 236 237 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); 238 239 return 0; 240 } 241 242 static void au0828_rc_stop(struct rc_dev *rc) 243 { 244 struct au0828_rc *ir = rc->priv; 245 246 cancel_delayed_work_sync(&ir->work); 247 248 /* do nothing if device is disconnected */ 249 if (!test_bit(DEV_DISCONNECTED, &ir->dev->dev_state)) { 250 /* Disable IR */ 251 au8522_rc_clear(ir, 0xe0, 1 << 4); 252 } 253 } 254 255 static int au0828_probe_i2c_ir(struct au0828_dev *dev) 256 { 257 int i = 0; 258 static const unsigned short addr_list[] = { 259 0x47, I2C_CLIENT_END 260 }; 261 262 while (addr_list[i] != I2C_CLIENT_END) { 263 if (i2c_probe_func_quick_read(dev->i2c_client.adapter, 264 addr_list[i]) == 1) 265 return addr_list[i]; 266 i++; 267 } 268 269 return -ENODEV; 270 } 271 272 int au0828_rc_register(struct au0828_dev *dev) 273 { 274 struct au0828_rc *ir; 275 struct rc_dev *rc; 276 int err = -ENOMEM; 277 u16 i2c_rc_dev_addr = 0; 278 279 if (!dev->board.has_ir_i2c || disable_ir) 280 return 0; 281 282 i2c_rc_dev_addr = au0828_probe_i2c_ir(dev); 283 if (!i2c_rc_dev_addr) 284 return -ENODEV; 285 286 ir = kzalloc(sizeof(*ir), GFP_KERNEL); 287 rc = rc_allocate_device(RC_DRIVER_IR_RAW); 288 if (!ir || !rc) 289 goto error; 290 291 /* record handles to ourself */ 292 ir->dev = dev; 293 dev->ir = ir; 294 ir->rc = rc; 295 296 rc->priv = ir; 297 rc->open = au0828_rc_start; 298 rc->close = au0828_rc_stop; 299 300 if (dev->board.has_ir_i2c) { /* external i2c device */ 301 switch (dev->boardnr) { 302 case AU0828_BOARD_HAUPPAUGE_HVR950Q: 303 rc->map_name = RC_MAP_HAUPPAUGE; 304 ir->get_key_i2c = au0828_get_key_au8522; 305 break; 306 default: 307 err = -ENODEV; 308 goto error; 309 } 310 311 ir->i2c_dev_addr = i2c_rc_dev_addr; 312 } 313 314 /* This is how often we ask the chip for IR information */ 315 ir->polling = 100; /* ms */ 316 317 /* init input device */ 318 snprintf(ir->name, sizeof(ir->name), "au0828 IR (%s)", 319 dev->board.name); 320 321 usb_make_path(dev->usbdev, ir->phys, sizeof(ir->phys)); 322 strlcat(ir->phys, "/input0", sizeof(ir->phys)); 323 324 rc->device_name = ir->name; 325 rc->input_phys = ir->phys; 326 rc->input_id.bustype = BUS_USB; 327 rc->input_id.version = 1; 328 rc->input_id.vendor = le16_to_cpu(dev->usbdev->descriptor.idVendor); 329 rc->input_id.product = le16_to_cpu(dev->usbdev->descriptor.idProduct); 330 rc->dev.parent = &dev->usbdev->dev; 331 rc->driver_name = "au0828-input"; 332 rc->allowed_protocols = RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX | 333 RC_PROTO_BIT_NEC32 | RC_PROTO_BIT_RC5; 334 335 /* all done */ 336 err = rc_register_device(rc); 337 if (err) 338 goto error; 339 340 pr_info("Remote controller %s initialized\n", ir->name); 341 342 return 0; 343 344 error: 345 dev->ir = NULL; 346 rc_free_device(rc); 347 kfree(ir); 348 return err; 349 } 350 351 void au0828_rc_unregister(struct au0828_dev *dev) 352 { 353 struct au0828_rc *ir = dev->ir; 354 355 /* skip detach on non attached boards */ 356 if (!ir) 357 return; 358 359 rc_unregister_device(ir->rc); 360 361 /* done */ 362 kfree(ir); 363 dev->ir = NULL; 364 } 365 366 int au0828_rc_suspend(struct au0828_dev *dev) 367 { 368 struct au0828_rc *ir = dev->ir; 369 370 if (!ir) 371 return 0; 372 373 pr_info("Stopping RC\n"); 374 375 cancel_delayed_work_sync(&ir->work); 376 377 /* Disable IR */ 378 au8522_rc_clear(ir, 0xe0, 1 << 4); 379 380 return 0; 381 } 382 383 int au0828_rc_resume(struct au0828_dev *dev) 384 { 385 struct au0828_rc *ir = dev->ir; 386 387 if (!ir) 388 return 0; 389 390 pr_info("Restarting RC\n"); 391 392 /* Enable IR */ 393 au8522_rc_set(ir, 0xe0, 1 << 4); 394 395 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling)); 396 397 return 0; 398 } 399