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