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         case CX23885_BOARD_TBS_6980:
  94         case CX23885_BOARD_TBS_6981:
  95                 /*
  96                  * The only boards we handle right now.  However other boards
  97                  * using the CX2388x integrated IR controller should be similar
  98                  */
  99                 break;
 100         default:
 101                 return;
 102         }
 103
 104         overrun = events & (V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN |
 105                             V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN);
 106
 107         data_available = events & (V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED |
 108                                    V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ);
 109
 110         if (overrun) {
 111                 /* If there was a FIFO overrun, stop the device */
 112                 v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 113                 params.enable = false;
 114                 /* Mitigate race with cx23885_input_ir_stop() */
 115                 params.shutdown = atomic_read(&dev->ir_input_stopping);
 116                 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 117         }
 118
 119         if (data_available)
 120                 cx23885_input_process_measurements(dev, overrun);
 121
 122         if (overrun) {
 123                 /* If there was a FIFO overrun, clear & restart the device */
 124                 params.enable = true;
 125                 /* Mitigate race with cx23885_input_ir_stop() */
 126                 params.shutdown = atomic_read(&dev->ir_input_stopping);
 127                 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 128         }
 129 }
 130
 131 static int cx23885_input_ir_start(struct cx23885_dev *dev)
 132 {
 133         struct v4l2_subdev_ir_parameters params;
 134
 135         if (dev->sd_ir == NULL)
 136                 return -ENODEV;
 137
 138         atomic_set(&dev->ir_input_stopping, 0);
 139
 140         v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 141         switch (dev->board) {
 142         case CX23885_BOARD_HAUPPAUGE_HVR1270:
 143         case CX23885_BOARD_HAUPPAUGE_HVR1850:
 144         case CX23885_BOARD_HAUPPAUGE_HVR1290:
 145         case CX23885_BOARD_HAUPPAUGE_HVR1250:
 146         case CX23885_BOARD_MYGICA_X8507:
 147                 /*
 148                  * The IR controller on this board only returns pulse widths.
 149                  * Any other mode setting will fail to set up the device.
 150                 */
 151                 params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
 152                 params.enable = true;
 153                 params.interrupt_enable = true;
 154                 params.shutdown = false;
 155
 156                 /* Setup for baseband compatible with both RC-5 and RC-6A */
 157                 params.modulation = false;
 158                 /* RC-5:  2,222,222 ns = 1/36 kHz * 32 cycles * 2 marks * 1.25*/
 159                 /* RC-6A: 3,333,333 ns = 1/36 kHz * 16 cycles * 6 marks * 1.25*/
 160                 params.max_pulse_width = 3333333; /* ns */
 161                 /* RC-5:    666,667 ns = 1/36 kHz * 32 cycles * 1 mark * 0.75 */
 162                 /* RC-6A:   333,333 ns = 1/36 kHz * 16 cycles * 1 mark * 0.75 */
 163                 params.noise_filter_min_width = 333333; /* ns */
 164                 /*
 165                  * This board has inverted receive sense:
 166                  * mark is received as low logic level;
 167                  * falling edges are detected as rising edges; etc.
 168                  */
 169                 params.invert_level = true;
 170                 break;
 171         case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
 172         case CX23885_BOARD_TEVII_S470:
 173         case CX23885_BOARD_TBS_6980:
 174         case CX23885_BOARD_TBS_6981:
 175                 /*
 176                  * The IR controller on this board only returns pulse widths.
 177                  * Any other mode setting will fail to set up the device.
 178                  */
 179                 params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
 180                 params.enable = true;
 181                 params.interrupt_enable = true;
 182                 params.shutdown = false;
 183
 184                 /* Setup for a standard NEC protocol */
 185                 params.carrier_freq = 37917; /* Hz, 455 kHz/12 for NEC */
 186                 params.carrier_range_lower = 33000; /* Hz */
 187                 params.carrier_range_upper = 43000; /* Hz */
 188                 params.duty_cycle = 33; /* percent, 33 percent for NEC */
 189
 190                 /*
 191                  * NEC max pulse width: (64/3)/(455 kHz/12) * 16 nec_units
 192                  * (64/3)/(455 kHz/12) * 16 nec_units * 1.375 = 12378022 ns
 193                  */
 194                 params.max_pulse_width = 12378022; /* ns */
 195
 196                 /*
 197                  * NEC noise filter min width: (64/3)/(455 kHz/12) * 1 nec_unit
 198                  * (64/3)/(455 kHz/12) * 1 nec_units * 0.625 = 351648 ns
 199                  */
 200                 params.noise_filter_min_width = 351648; /* ns */
 201
 202                 params.modulation = false;
 203                 params.invert_level = true;
 204                 break;
 205         }
 206         v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 207         return 0;
 208 }
 209
 210 static int cx23885_input_ir_open(struct rc_dev *rc)
 211 {
 212         struct cx23885_kernel_ir *kernel_ir = rc->priv;
 213
 214         if (kernel_ir->cx == NULL)
 215                 return -ENODEV;
 216
 217         return cx23885_input_ir_start(kernel_ir->cx);
 218 }
 219
 220 static void cx23885_input_ir_stop(struct cx23885_dev *dev)
 221 {
 222         struct v4l2_subdev_ir_parameters params;
 223
 224         if (dev->sd_ir == NULL)
 225                 return;
 226
 227         /*
 228          * Stop the sd_ir subdevice from generating notifications and
 229          * scheduling work.
 230          * It is shutdown this way in order to mitigate a race with
 231          * cx23885_input_rx_work_handler() in the overrun case, which could
 232          * re-enable the subdevice.
 233          */
 234         atomic_set(&dev->ir_input_stopping, 1);
 235         v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 236         while (params.shutdown == false) {
 237                 params.enable = false;
 238                 params.interrupt_enable = false;
 239                 params.shutdown = true;
 240                 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 241                 v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 242         }
 243         flush_work(&dev->cx25840_work);
 244         flush_work(&dev->ir_rx_work);
 245         flush_work(&dev->ir_tx_work);
 246 }
 247
 248 static void cx23885_input_ir_close(struct rc_dev *rc)
 249 {
 250         struct cx23885_kernel_ir *kernel_ir = rc->priv;
 251
 252         if (kernel_ir->cx != NULL)
 253                 cx23885_input_ir_stop(kernel_ir->cx);
 254 }
 255
 256 int cx23885_input_init(struct cx23885_dev *dev)
 257 {
 258         struct cx23885_kernel_ir *kernel_ir;
 259         struct rc_dev *rc;
 260         char *rc_map;
 261         enum rc_driver_type driver_type;
 262         unsigned long allowed_protos;
 263
 264         int ret;
 265
 266         /*
 267          * If the IR device (hardware registers, chip, GPIO lines, etc.) isn't
 268          * encapsulated in a v4l2_subdev, then I'm not going to deal with it.
 269          */
 270         if (dev->sd_ir == NULL)
 271                 return -ENODEV;
 272
 273         switch (dev->board) {
 274         case CX23885_BOARD_HAUPPAUGE_HVR1270:
 275         case CX23885_BOARD_HAUPPAUGE_HVR1850:
 276         case CX23885_BOARD_HAUPPAUGE_HVR1290:
 277         case CX23885_BOARD_HAUPPAUGE_HVR1250:
 278                 /* Integrated CX2388[58] IR controller */
 279                 driver_type = RC_DRIVER_IR_RAW;
 280                 allowed_protos = RC_BIT_ALL;
 281                 /* The grey Hauppauge RC-5 remote */
 282                 rc_map = RC_MAP_HAUPPAUGE;
 283                 break;
 284         case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
 285                 /* Integrated CX23885 IR controller */
 286                 driver_type = RC_DRIVER_IR_RAW;
 287                 allowed_protos = RC_BIT_NEC;
 288                 /* The grey Terratec remote with orange buttons */
 289                 rc_map = RC_MAP_NEC_TERRATEC_CINERGY_XS;
 290                 break;
 291         case CX23885_BOARD_TEVII_S470:
 292                 /* Integrated CX23885 IR controller */
 293                 driver_type = RC_DRIVER_IR_RAW;
 294                 allowed_protos = RC_BIT_ALL;
 295                 /* A guess at the remote */
 296                 rc_map = RC_MAP_TEVII_NEC;
 297                 break;
 298         case CX23885_BOARD_MYGICA_X8507:
 299                 /* Integrated CX23885 IR controller */
 300                 driver_type = RC_DRIVER_IR_RAW;
 301                 allowed_protos = RC_BIT_ALL;
 302                 /* A guess at the remote */
 303                 rc_map = RC_MAP_TOTAL_MEDIA_IN_HAND_02;
 304                 break;
 305         case CX23885_BOARD_TBS_6980:
 306         case CX23885_BOARD_TBS_6981:
 307                 /* Integrated CX23885 IR controller */
 308                 driver_type = RC_DRIVER_IR_RAW;
 309                 allowed_protos = RC_BIT_ALL;
 310                 /* A guess at the remote */
 311                 rc_map = RC_MAP_TBS_NEC;
 312                 break;
 313         default:
 314                 return -ENODEV;
 315         }
 316
 317         /* cx23885 board instance kernel IR state */
 318         kernel_ir = kzalloc(sizeof(struct cx23885_kernel_ir), GFP_KERNEL);
 319         if (kernel_ir == NULL)
 320                 return -ENOMEM;
 321
 322         kernel_ir->cx = dev;
 323         kernel_ir->name = kasprintf(GFP_KERNEL, "cx23885 IR (%s)",
 324                                     cx23885_boards[dev->board].name);
 325         kernel_ir->phys = kasprintf(GFP_KERNEL, "pci-%s/ir0",
 326                                     pci_name(dev->pci));
 327
 328         /* input device */
 329         rc = rc_allocate_device();
 330         if (!rc) {
 331                 ret = -ENOMEM;
 332                 goto err_out_free;
 333         }
 334
 335         kernel_ir->rc = rc;
 336         rc->input_name = kernel_ir->name;
 337         rc->input_phys = kernel_ir->phys;
 338         rc->input_id.bustype = BUS_PCI;
 339         rc->input_id.version = 1;
 340         if (dev->pci->subsystem_vendor) {
 341                 rc->input_id.vendor  = dev->pci->subsystem_vendor;
 342                 rc->input_id.product = dev->pci->subsystem_device;
 343         } else {
 344                 rc->input_id.vendor  = dev->pci->vendor;
 345                 rc->input_id.product = dev->pci->device;
 346         }
 347         rc->dev.parent = &dev->pci->dev;
 348         rc->driver_type = driver_type;
 349         rc->allowed_protos = allowed_protos;
 350         rc->priv = kernel_ir;
 351         rc->open = cx23885_input_ir_open;
 352         rc->close = cx23885_input_ir_close;
 353         rc->map_name = rc_map;
 354         rc->driver_name = MODULE_NAME;
 355
 356         /* Go */
 357         dev->kernel_ir = kernel_ir;
 358         ret = rc_register_device(rc);
 359         if (ret)
 360                 goto err_out_stop;
 361
 362         return 0;
 363
 364 err_out_stop:
 365         cx23885_input_ir_stop(dev);
 366         dev->kernel_ir = NULL;
 367         rc_free_device(rc);
 368 err_out_free:
 369         kfree(kernel_ir->phys);
 370         kfree(kernel_ir->name);
 371         kfree(kernel_ir);
 372         return ret;
 373 }
 374
 375 void cx23885_input_fini(struct cx23885_dev *dev)
 376 {
 377         /* Always stop the IR hardware from generating interrupts */
 378         cx23885_input_ir_stop(dev);
 379
 380         if (dev->kernel_ir == NULL)
 381                 return;
 382         rc_unregister_device(dev->kernel_ir->rc);
 383         kfree(dev->kernel_ir->phys);
 384         kfree(dev->kernel_ir->name);
 385         kfree(dev->kernel_ir);
 386         dev->kernel_ir = NULL;
 387 }