drivers/media/pci/cx23885/cx23885-input.c

   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@infradead.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  *  You should have received a copy of the GNU General Public License
  33  *  along with this program; if not, write to the Free Software
  34  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  35  *  02110-1301, USA.
  36  */
  37
  38 #include <linux/slab.h>
  39 #include <media/rc-core.h>
  40 #include <media/v4l2-subdev.h>
  41
  42 #include "cx23885.h"
  43 #include "cx23885-input.h"
  44
  45 #define MODULE_NAME "cx23885"
  46
  47 static void cx23885_input_process_measurements(struct cx23885_dev *dev,
  48                                                bool overrun)
  49 {
  50         struct cx23885_kernel_ir *kernel_ir = dev->kernel_ir;
  51
  52         ssize_t num;
  53         int count, i;
  54         bool handle = false;
  55         struct ir_raw_event ir_core_event[64];
  56
  57         do {
  58                 num = 0;
  59                 v4l2_subdev_call(dev->sd_ir, ir, rx_read, (u8 *) ir_core_event,
  60                                  sizeof(ir_core_event), &num);
  61
  62                 count = num / sizeof(struct ir_raw_event);
  63
  64                 for (i = 0; i < count; i++) {
  65                         ir_raw_event_store(kernel_ir->rc,
  66                                            &ir_core_event[i]);
  67                         handle = true;
  68                 }
  69         } while (num != 0);
  70
  71         if (overrun)
  72                 ir_raw_event_reset(kernel_ir->rc);
  73         else if (handle)
  74                 ir_raw_event_handle(kernel_ir->rc);
  75 }
  76
  77 void cx23885_input_rx_work_handler(struct cx23885_dev *dev, u32 events)
  78 {
  79         struct v4l2_subdev_ir_parameters params;
  80         int overrun, data_available;
  81
  82         if (dev->sd_ir == NULL || events == 0)
  83                 return;
  84
  85         switch (dev->board) {
  86         case CX23885_BOARD_HAUPPAUGE_HVR1270:
  87         case CX23885_BOARD_HAUPPAUGE_HVR1850:
  88         case CX23885_BOARD_HAUPPAUGE_HVR1290:
  89         case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
  90         case CX23885_BOARD_TEVII_S470:
  91         case CX23885_BOARD_HAUPPAUGE_HVR1250:
  92         case CX23885_BOARD_MYGICA_X8507:
  93                 /*
  94                  * The only boards we handle right now.  However other boards
  95                  * using the CX2388x integrated IR controller should be similar
  96                  */
  97                 break;
  98         default:
  99                 return;
 100         }
 101
 102         overrun = events & (V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN |
 103                             V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN);
 104
 105         data_available = events & (V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED |
 106                                    V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ);
 107
 108         if (overrun) {
 109                 /* If there was a FIFO overrun, stop the device */
 110                 v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 111                 params.enable = false;
 112                 /* Mitigate race with cx23885_input_ir_stop() */
 113                 params.shutdown = atomic_read(&dev->ir_input_stopping);
 114                 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 115         }
 116
 117         if (data_available)
 118                 cx23885_input_process_measurements(dev, overrun);
 119
 120         if (overrun) {
 121                 /* If there was a FIFO overrun, clear & restart the device */
 122                 params.enable = true;
 123                 /* Mitigate race with cx23885_input_ir_stop() */
 124                 params.shutdown = atomic_read(&dev->ir_input_stopping);
 125                 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 126         }
 127 }
 128
 129 static int cx23885_input_ir_start(struct cx23885_dev *dev)
 130 {
 131         struct v4l2_subdev_ir_parameters params;
 132
 133         if (dev->sd_ir == NULL)
 134                 return -ENODEV;
 135
 136         atomic_set(&dev->ir_input_stopping, 0);
 137
 138         v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 139         switch (dev->board) {
 140         case CX23885_BOARD_HAUPPAUGE_HVR1270:
 141         case CX23885_BOARD_HAUPPAUGE_HVR1850:
 142         case CX23885_BOARD_HAUPPAUGE_HVR1290:
 143         case CX23885_BOARD_HAUPPAUGE_HVR1250:
 144         case CX23885_BOARD_MYGICA_X8507:
 145                 /*
 146                  * The IR controller on this board only returns pulse widths.
 147                  * Any other mode setting will fail to set up the device.
 148                 */
 149                 params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
 150                 params.enable = true;
 151                 params.interrupt_enable = true;
 152                 params.shutdown = false;
 153
 154                 /* Setup for baseband compatible with both RC-5 and RC-6A */
 155                 params.modulation = false;
 156                 /* RC-5:  2,222,222 ns = 1/36 kHz * 32 cycles * 2 marks * 1.25*/
 157                 /* RC-6A: 3,333,333 ns = 1/36 kHz * 16 cycles * 6 marks * 1.25*/
 158                 params.max_pulse_width = 3333333; /* ns */
 159                 /* RC-5:    666,667 ns = 1/36 kHz * 32 cycles * 1 mark * 0.75 */
 160                 /* RC-6A:   333,333 ns = 1/36 kHz * 16 cycles * 1 mark * 0.75 */
 161                 params.noise_filter_min_width = 333333; /* ns */
 162                 /*
 163                  * This board has inverted receive sense:
 164                  * mark is received as low logic level;
 165                  * falling edges are detected as rising edges; etc.
 166                  */
 167                 params.invert_level = true;
 168                 break;
 169         case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
 170         case CX23885_BOARD_TEVII_S470:
 171                 /*
 172                  * The IR controller on this board only returns pulse widths.
 173                  * Any other mode setting will fail to set up the device.
 174                  */
 175                 params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
 176                 params.enable = true;
 177                 params.interrupt_enable = true;
 178                 params.shutdown = false;
 179
 180                 /* Setup for a standard NEC protocol */
 181                 params.carrier_freq = 37917; /* Hz, 455 kHz/12 for NEC */
 182                 params.carrier_range_lower = 33000; /* Hz */
 183                 params.carrier_range_upper = 43000; /* Hz */
 184                 params.duty_cycle = 33; /* percent, 33 percent for NEC */
 185
 186                 /*
 187                  * NEC max pulse width: (64/3)/(455 kHz/12) * 16 nec_units
 188                  * (64/3)/(455 kHz/12) * 16 nec_units * 1.375 = 12378022 ns
 189                  */
 190                 params.max_pulse_width = 12378022; /* ns */
 191
 192                 /*
 193                  * NEC noise filter min width: (64/3)/(455 kHz/12) * 1 nec_unit
 194                  * (64/3)/(455 kHz/12) * 1 nec_units * 0.625 = 351648 ns
 195                  */
 196                 params.noise_filter_min_width = 351648; /* ns */
 197
 198                 params.modulation = false;
 199                 params.invert_level = true;
 200                 break;
 201         }
 202         v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 203         return 0;
 204 }
 205
 206 static int cx23885_input_ir_open(struct rc_dev *rc)
 207 {
 208         struct cx23885_kernel_ir *kernel_ir = rc->priv;
 209
 210         if (kernel_ir->cx == NULL)
 211                 return -ENODEV;
 212
 213         return cx23885_input_ir_start(kernel_ir->cx);
 214 }
 215
 216 static void cx23885_input_ir_stop(struct cx23885_dev *dev)
 217 {
 218         struct v4l2_subdev_ir_parameters params;
 219
 220         if (dev->sd_ir == NULL)
 221                 return;
 222
 223         /*
 224          * Stop the sd_ir subdevice from generating notifications and
 225          * scheduling work.
 226          * It is shutdown this way in order to mitigate a race with
 227          * cx23885_input_rx_work_handler() in the overrun case, which could
 228          * re-enable the subdevice.
 229          */
 230         atomic_set(&dev->ir_input_stopping, 1);
 231         v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 232         while (params.shutdown == false) {
 233                 params.enable = false;
 234                 params.interrupt_enable = false;
 235                 params.shutdown = true;
 236                 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 237                 v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 238         }
 239         flush_work(&dev->cx25840_work);
 240         flush_work(&dev->ir_rx_work);
 241         flush_work(&dev->ir_tx_work);
 242 }
 243
 244 static void cx23885_input_ir_close(struct rc_dev *rc)
 245 {
 246         struct cx23885_kernel_ir *kernel_ir = rc->priv;
 247
 248         if (kernel_ir->cx != NULL)
 249                 cx23885_input_ir_stop(kernel_ir->cx);
 250 }
 251
 252 int cx23885_input_init(struct cx23885_dev *dev)
 253 {
 254         struct cx23885_kernel_ir *kernel_ir;
 255         struct rc_dev *rc;
 256         char *rc_map;
 257         enum rc_driver_type driver_type;
 258         unsigned long allowed_protos;
 259
 260         int ret;
 261
 262         /*
 263          * If the IR device (hardware registers, chip, GPIO lines, etc.) isn't
 264          * encapsulated in a v4l2_subdev, then I'm not going to deal with it.
 265          */
 266         if (dev->sd_ir == NULL)
 267                 return -ENODEV;
 268
 269         switch (dev->board) {
 270         case CX23885_BOARD_HAUPPAUGE_HVR1270:
 271         case CX23885_BOARD_HAUPPAUGE_HVR1850:
 272         case CX23885_BOARD_HAUPPAUGE_HVR1290:
 273         case CX23885_BOARD_HAUPPAUGE_HVR1250:
 274                 /* Integrated CX2388[58] IR controller */
 275                 driver_type = RC_DRIVER_IR_RAW;
 276                 allowed_protos = RC_BIT_ALL;
 277                 /* The grey Hauppauge RC-5 remote */
 278                 rc_map = RC_MAP_HAUPPAUGE;
 279                 break;
 280         case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
 281                 /* Integrated CX23885 IR controller */
 282                 driver_type = RC_DRIVER_IR_RAW;
 283                 allowed_protos = RC_BIT_NEC;
 284                 /* The grey Terratec remote with orange buttons */
 285                 rc_map = RC_MAP_NEC_TERRATEC_CINERGY_XS;
 286                 break;
 287         case CX23885_BOARD_TEVII_S470:
 288                 /* Integrated CX23885 IR controller */
 289                 driver_type = RC_DRIVER_IR_RAW;
 290                 allowed_protos = RC_BIT_ALL;
 291                 /* A guess at the remote */
 292                 rc_map = RC_MAP_TEVII_NEC;
 293                 break;
 294         case CX23885_BOARD_MYGICA_X8507:
 295                 /* Integrated CX23885 IR controller */
 296                 driver_type = RC_DRIVER_IR_RAW;
 297                 allowed_protos = RC_BIT_ALL;
 298                 /* A guess at the remote */
 299                 rc_map = RC_MAP_TOTAL_MEDIA_IN_HAND_02;
 300                 break;
 301         default:
 302                 return -ENODEV;
 303         }
 304
 305         /* cx23885 board instance kernel IR state */
 306         kernel_ir = kzalloc(sizeof(struct cx23885_kernel_ir), GFP_KERNEL);
 307         if (kernel_ir == NULL)
 308                 return -ENOMEM;
 309
 310         kernel_ir->cx = dev;
 311         kernel_ir->name = kasprintf(GFP_KERNEL, "cx23885 IR (%s)",
 312                                     cx23885_boards[dev->board].name);
 313         kernel_ir->phys = kasprintf(GFP_KERNEL, "pci-%s/ir0",
 314                                     pci_name(dev->pci));
 315
 316         /* input device */
 317         rc = rc_allocate_device();
 318         if (!rc) {
 319                 ret = -ENOMEM;
 320                 goto err_out_free;
 321         }
 322
 323         kernel_ir->rc = rc;
 324         rc->input_name = kernel_ir->name;
 325         rc->input_phys = kernel_ir->phys;
 326         rc->input_id.bustype = BUS_PCI;
 327         rc->input_id.version = 1;
 328         if (dev->pci->subsystem_vendor) {
 329                 rc->input_id.vendor  = dev->pci->subsystem_vendor;
 330                 rc->input_id.product = dev->pci->subsystem_device;
 331         } else {
 332                 rc->input_id.vendor  = dev->pci->vendor;
 333                 rc->input_id.product = dev->pci->device;
 334         }
 335         rc->dev.parent = &dev->pci->dev;
 336         rc->driver_type = driver_type;
 337         rc->allowed_protos = allowed_protos;
 338         rc->priv = kernel_ir;
 339         rc->open = cx23885_input_ir_open;
 340         rc->close = cx23885_input_ir_close;
 341         rc->map_name = rc_map;
 342         rc->driver_name = MODULE_NAME;
 343
 344         /* Go */
 345         dev->kernel_ir = kernel_ir;
 346         ret = rc_register_device(rc);
 347         if (ret)
 348                 goto err_out_stop;
 349
 350         return 0;
 351
 352 err_out_stop:
 353         cx23885_input_ir_stop(dev);
 354         dev->kernel_ir = NULL;
 355         rc_free_device(rc);
 356 err_out_free:
 357         kfree(kernel_ir->phys);
 358         kfree(kernel_ir->name);
 359         kfree(kernel_ir);
 360         return ret;
 361 }
 362
 363 void cx23885_input_fini(struct cx23885_dev *dev)
 364 {
 365         /* Always stop the IR hardware from generating interrupts */
 366         cx23885_input_ir_stop(dev);
 367
 368         if (dev->kernel_ir == NULL)
 369                 return;
 370         rc_unregister_device(dev->kernel_ir->rc);
 371         kfree(dev->kernel_ir->phys);
 372         kfree(dev->kernel_ir->name);
 373         kfree(dev->kernel_ir);
 374         dev->kernel_ir = NULL;
 375 }