1 /* 2 * Driver for the Conexant CX23885/7/8 PCIe bridge 3 * 4 * Infrared remote control input device 5 * 6 * Most of this file is 7 * 8 * Copyright (C) 2009 Andy Walls <awalls@md.metrocast.net> 9 * 10 * However, the cx23885_input_{init,fini} functions contained herein are 11 * derived from Linux kernel files linux/media/video/.../...-input.c marked as: 12 * 13 * Copyright (C) 2008 <srinivasa.deevi at conexant dot com> 14 * Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it> 15 * Markus Rechberger <mrechberger@gmail.com> 16 * Mauro Carvalho Chehab <mchehab@kernel.org> 17 * Sascha Sommer <saschasommer@freenet.de> 18 * Copyright (C) 2004, 2005 Chris Pascoe 19 * Copyright (C) 2003, 2004 Gerd Knorr 20 * Copyright (C) 2003 Pavel Machek 21 * 22 * This program is free software; you can redistribute it and/or 23 * modify it under the terms of the GNU General Public License 24 * as published by the Free Software Foundation; either version 2 25 * of the License, or (at your option) any later version. 26 * 27 * This program is distributed in the hope that it will be useful, 28 * but WITHOUT ANY WARRANTY; without even the implied warranty of 29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 30 * GNU General Public License for more details. 31 */ 32 33 #include "cx23885.h" 34 #include "cx23885-input.h" 35 36 #include <linux/slab.h> 37 #include <media/rc-core.h> 38 #include <media/v4l2-subdev.h> 39 40 #define MODULE_NAME "cx23885" 41 42 static void cx23885_input_process_measurements(struct cx23885_dev *dev, 43 bool overrun) 44 { 45 struct cx23885_kernel_ir *kernel_ir = dev->kernel_ir; 46 47 ssize_t num; 48 int count, i; 49 bool handle = false; 50 struct ir_raw_event ir_core_event[64]; 51 52 do { 53 num = 0; 54 v4l2_subdev_call(dev->sd_ir, ir, rx_read, (u8 *) ir_core_event, 55 sizeof(ir_core_event), &num); 56 57 count = num / sizeof(struct ir_raw_event); 58 59 for (i = 0; i < count; i++) { 60 ir_raw_event_store(kernel_ir->rc, 61 &ir_core_event[i]); 62 handle = true; 63 } 64 } while (num != 0); 65 66 if (overrun) 67 ir_raw_event_reset(kernel_ir->rc); 68 else if (handle) 69 ir_raw_event_handle(kernel_ir->rc); 70 } 71 72 void cx23885_input_rx_work_handler(struct cx23885_dev *dev, u32 events) 73 { 74 struct v4l2_subdev_ir_parameters params; 75 int overrun, data_available; 76 77 if (dev->sd_ir == NULL || events == 0) 78 return; 79 80 switch (dev->board) { 81 case CX23885_BOARD_HAUPPAUGE_HVR1270: 82 case CX23885_BOARD_HAUPPAUGE_HVR1850: 83 case CX23885_BOARD_HAUPPAUGE_HVR1290: 84 case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL: 85 case CX23885_BOARD_TEVII_S470: 86 case CX23885_BOARD_HAUPPAUGE_HVR1250: 87 case CX23885_BOARD_MYGICA_X8507: 88 case CX23885_BOARD_TBS_6980: 89 case CX23885_BOARD_TBS_6981: 90 case CX23885_BOARD_DVBSKY_T9580: 91 case CX23885_BOARD_DVBSKY_T980C: 92 case CX23885_BOARD_DVBSKY_S950C: 93 case CX23885_BOARD_TT_CT2_4500_CI: 94 case CX23885_BOARD_DVBSKY_S950: 95 case CX23885_BOARD_DVBSKY_S952: 96 case CX23885_BOARD_DVBSKY_T982: 97 case CX23885_BOARD_HAUPPAUGE_HVR1265_K4: 98 /* 99 * The only boards we handle right now. However other boards 100 * using the CX2388x integrated IR controller should be similar 101 */ 102 break; 103 default: 104 return; 105 } 106 107 overrun = events & (V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN | 108 V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN); 109 110 data_available = events & (V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED | 111 V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ); 112 113 if (overrun) { 114 /* If there was a FIFO overrun, stop the device */ 115 v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms); 116 params.enable = false; 117 /* Mitigate race with cx23885_input_ir_stop() */ 118 params.shutdown = atomic_read(&dev->ir_input_stopping); 119 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms); 120 } 121 122 if (data_available) 123 cx23885_input_process_measurements(dev, overrun); 124 125 if (overrun) { 126 /* If there was a FIFO overrun, clear & restart the device */ 127 params.enable = true; 128 /* Mitigate race with cx23885_input_ir_stop() */ 129 params.shutdown = atomic_read(&dev->ir_input_stopping); 130 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms); 131 } 132 } 133 134 static int cx23885_input_ir_start(struct cx23885_dev *dev) 135 { 136 struct v4l2_subdev_ir_parameters params; 137 138 if (dev->sd_ir == NULL) 139 return -ENODEV; 140 141 atomic_set(&dev->ir_input_stopping, 0); 142 143 v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms); 144 switch (dev->board) { 145 case CX23885_BOARD_HAUPPAUGE_HVR1270: 146 case CX23885_BOARD_HAUPPAUGE_HVR1850: 147 case CX23885_BOARD_HAUPPAUGE_HVR1290: 148 case CX23885_BOARD_HAUPPAUGE_HVR1250: 149 case CX23885_BOARD_MYGICA_X8507: 150 case CX23885_BOARD_DVBSKY_T9580: 151 case CX23885_BOARD_DVBSKY_T980C: 152 case CX23885_BOARD_DVBSKY_S950C: 153 case CX23885_BOARD_TT_CT2_4500_CI: 154 case CX23885_BOARD_DVBSKY_S950: 155 case CX23885_BOARD_DVBSKY_S952: 156 case CX23885_BOARD_DVBSKY_T982: 157 case CX23885_BOARD_HAUPPAUGE_HVR1265_K4: 158 /* 159 * The IR controller on this board only returns pulse widths. 160 * Any other mode setting will fail to set up the device. 161 */ 162 params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH; 163 params.enable = true; 164 params.interrupt_enable = true; 165 params.shutdown = false; 166 167 /* Setup for baseband compatible with both RC-5 and RC-6A */ 168 params.modulation = false; 169 /* RC-5: 2,222,222 ns = 1/36 kHz * 32 cycles * 2 marks * 1.25*/ 170 /* RC-6A: 3,333,333 ns = 1/36 kHz * 16 cycles * 6 marks * 1.25*/ 171 params.max_pulse_width = 3333333; /* ns */ 172 /* RC-5: 666,667 ns = 1/36 kHz * 32 cycles * 1 mark * 0.75 */ 173 /* RC-6A: 333,333 ns = 1/36 kHz * 16 cycles * 1 mark * 0.75 */ 174 params.noise_filter_min_width = 333333; /* ns */ 175 /* 176 * This board has inverted receive sense: 177 * mark is received as low logic level; 178 * falling edges are detected as rising edges; etc. 179 */ 180 params.invert_level = true; 181 break; 182 case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL: 183 case CX23885_BOARD_TEVII_S470: 184 case CX23885_BOARD_TBS_6980: 185 case CX23885_BOARD_TBS_6981: 186 /* 187 * The IR controller on this board only returns pulse widths. 188 * Any other mode setting will fail to set up the device. 189 */ 190 params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH; 191 params.enable = true; 192 params.interrupt_enable = true; 193 params.shutdown = false; 194 195 /* Setup for a standard NEC protocol */ 196 params.carrier_freq = 37917; /* Hz, 455 kHz/12 for NEC */ 197 params.carrier_range_lower = 33000; /* Hz */ 198 params.carrier_range_upper = 43000; /* Hz */ 199 params.duty_cycle = 33; /* percent, 33 percent for NEC */ 200 201 /* 202 * NEC max pulse width: (64/3)/(455 kHz/12) * 16 nec_units 203 * (64/3)/(455 kHz/12) * 16 nec_units * 1.375 = 12378022 ns 204 */ 205 params.max_pulse_width = 12378022; /* ns */ 206 207 /* 208 * NEC noise filter min width: (64/3)/(455 kHz/12) * 1 nec_unit 209 * (64/3)/(455 kHz/12) * 1 nec_units * 0.625 = 351648 ns 210 */ 211 params.noise_filter_min_width = 351648; /* ns */ 212 213 params.modulation = false; 214 params.invert_level = true; 215 break; 216 } 217 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms); 218 return 0; 219 } 220 221 static int cx23885_input_ir_open(struct rc_dev *rc) 222 { 223 struct cx23885_kernel_ir *kernel_ir = rc->priv; 224 225 if (kernel_ir->cx == NULL) 226 return -ENODEV; 227 228 return cx23885_input_ir_start(kernel_ir->cx); 229 } 230 231 static void cx23885_input_ir_stop(struct cx23885_dev *dev) 232 { 233 struct v4l2_subdev_ir_parameters params; 234 235 if (dev->sd_ir == NULL) 236 return; 237 238 /* 239 * Stop the sd_ir subdevice from generating notifications and 240 * scheduling work. 241 * It is shutdown this way in order to mitigate a race with 242 * cx23885_input_rx_work_handler() in the overrun case, which could 243 * re-enable the subdevice. 244 */ 245 atomic_set(&dev->ir_input_stopping, 1); 246 v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms); 247 while (params.shutdown == false) { 248 params.enable = false; 249 params.interrupt_enable = false; 250 params.shutdown = true; 251 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, ¶ms); 252 v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, ¶ms); 253 } 254 flush_work(&dev->cx25840_work); 255 flush_work(&dev->ir_rx_work); 256 flush_work(&dev->ir_tx_work); 257 } 258 259 static void cx23885_input_ir_close(struct rc_dev *rc) 260 { 261 struct cx23885_kernel_ir *kernel_ir = rc->priv; 262 263 if (kernel_ir->cx != NULL) 264 cx23885_input_ir_stop(kernel_ir->cx); 265 } 266 267 int cx23885_input_init(struct cx23885_dev *dev) 268 { 269 struct cx23885_kernel_ir *kernel_ir; 270 struct rc_dev *rc; 271 char *rc_map; 272 u64 allowed_protos; 273 274 int ret; 275 276 /* 277 * If the IR device (hardware registers, chip, GPIO lines, etc.) isn't 278 * encapsulated in a v4l2_subdev, then I'm not going to deal with it. 279 */ 280 if (dev->sd_ir == NULL) 281 return -ENODEV; 282 283 switch (dev->board) { 284 case CX23885_BOARD_HAUPPAUGE_HVR1270: 285 case CX23885_BOARD_HAUPPAUGE_HVR1850: 286 case CX23885_BOARD_HAUPPAUGE_HVR1290: 287 case CX23885_BOARD_HAUPPAUGE_HVR1250: 288 case CX23885_BOARD_HAUPPAUGE_HVR1265_K4: 289 /* Integrated CX2388[58] IR controller */ 290 allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER; 291 /* The grey Hauppauge RC-5 remote */ 292 rc_map = RC_MAP_HAUPPAUGE; 293 break; 294 case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL: 295 /* Integrated CX23885 IR controller */ 296 allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER; 297 /* The grey Terratec remote with orange buttons */ 298 rc_map = RC_MAP_NEC_TERRATEC_CINERGY_XS; 299 break; 300 case CX23885_BOARD_TEVII_S470: 301 /* Integrated CX23885 IR controller */ 302 allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER; 303 /* A guess at the remote */ 304 rc_map = RC_MAP_TEVII_NEC; 305 break; 306 case CX23885_BOARD_MYGICA_X8507: 307 /* Integrated CX23885 IR controller */ 308 allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER; 309 /* A guess at the remote */ 310 rc_map = RC_MAP_TOTAL_MEDIA_IN_HAND_02; 311 break; 312 case CX23885_BOARD_TBS_6980: 313 case CX23885_BOARD_TBS_6981: 314 /* Integrated CX23885 IR controller */ 315 allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER; 316 /* A guess at the remote */ 317 rc_map = RC_MAP_TBS_NEC; 318 break; 319 case CX23885_BOARD_DVBSKY_T9580: 320 case CX23885_BOARD_DVBSKY_T980C: 321 case CX23885_BOARD_DVBSKY_S950C: 322 case CX23885_BOARD_DVBSKY_S950: 323 case CX23885_BOARD_DVBSKY_S952: 324 case CX23885_BOARD_DVBSKY_T982: 325 /* Integrated CX23885 IR controller */ 326 allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER; 327 rc_map = RC_MAP_DVBSKY; 328 break; 329 case CX23885_BOARD_TT_CT2_4500_CI: 330 /* Integrated CX23885 IR controller */ 331 allowed_protos = RC_PROTO_BIT_ALL_IR_DECODER; 332 rc_map = RC_MAP_TT_1500; 333 break; 334 default: 335 return -ENODEV; 336 } 337 338 /* cx23885 board instance kernel IR state */ 339 kernel_ir = kzalloc(sizeof(struct cx23885_kernel_ir), GFP_KERNEL); 340 if (kernel_ir == NULL) 341 return -ENOMEM; 342 343 kernel_ir->cx = dev; 344 kernel_ir->name = kasprintf(GFP_KERNEL, "cx23885 IR (%s)", 345 cx23885_boards[dev->board].name); 346 if (!kernel_ir->name) { 347 ret = -ENOMEM; 348 goto err_out_free; 349 } 350 351 kernel_ir->phys = kasprintf(GFP_KERNEL, "pci-%s/ir0", 352 pci_name(dev->pci)); 353 if (!kernel_ir->phys) { 354 ret = -ENOMEM; 355 goto err_out_free_name; 356 } 357 358 /* input device */ 359 rc = rc_allocate_device(RC_DRIVER_IR_RAW); 360 if (!rc) { 361 ret = -ENOMEM; 362 goto err_out_free_phys; 363 } 364 365 kernel_ir->rc = rc; 366 rc->device_name = kernel_ir->name; 367 rc->input_phys = kernel_ir->phys; 368 rc->input_id.bustype = BUS_PCI; 369 rc->input_id.version = 1; 370 if (dev->pci->subsystem_vendor) { 371 rc->input_id.vendor = dev->pci->subsystem_vendor; 372 rc->input_id.product = dev->pci->subsystem_device; 373 } else { 374 rc->input_id.vendor = dev->pci->vendor; 375 rc->input_id.product = dev->pci->device; 376 } 377 rc->dev.parent = &dev->pci->dev; 378 rc->allowed_protocols = allowed_protos; 379 rc->priv = kernel_ir; 380 rc->open = cx23885_input_ir_open; 381 rc->close = cx23885_input_ir_close; 382 rc->map_name = rc_map; 383 rc->driver_name = MODULE_NAME; 384 385 /* Go */ 386 dev->kernel_ir = kernel_ir; 387 ret = rc_register_device(rc); 388 if (ret) 389 goto err_out_stop; 390 391 return 0; 392 393 err_out_stop: 394 cx23885_input_ir_stop(dev); 395 dev->kernel_ir = NULL; 396 rc_free_device(rc); 397 err_out_free_phys: 398 kfree(kernel_ir->phys); 399 err_out_free_name: 400 kfree(kernel_ir->name); 401 err_out_free: 402 kfree(kernel_ir); 403 return ret; 404 } 405 406 void cx23885_input_fini(struct cx23885_dev *dev) 407 { 408 /* Always stop the IR hardware from generating interrupts */ 409 cx23885_input_ir_stop(dev); 410 411 if (dev->kernel_ir == NULL) 412 return; 413 rc_unregister_device(dev->kernel_ir->rc); 414 kfree(dev->kernel_ir->phys); 415 kfree(dev->kernel_ir->name); 416 kfree(dev->kernel_ir); 417 dev->kernel_ir = NULL; 418 } 419