release/src-rt-6.x.4708/linux/linux-2.6.36/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/input.h>
  39 #include <linux/slab.h>
  40 #include <media/ir-core.h>
  41 #include <media/v4l2-subdev.h>
  42
  43 #include "cx23885.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->inp_dev,
  66                                            &ir_core_event[i]);
  67                         handle = true;
  68                 }
  69         } while (num != 0);
  70
  71         if (overrun)
  72                 ir_raw_event_reset(kernel_ir->inp_dev);
  73         else if (handle)
  74                 ir_raw_event_handle(kernel_ir->inp_dev);
  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_HVR1850:
  87         case CX23885_BOARD_HAUPPAUGE_HVR1290:
  88         case CX23885_BOARD_TEVII_S470:
  89         case CX23885_BOARD_HAUPPAUGE_HVR1250:
  90                 /*
  91                  * The only boards we handle right now.  However other boards
  92                  * using the CX2388x integrated IR controller should be similar
  93                  */
  94                 break;
  95         default:
  96                 return;
  97         }
  98
  99         overrun = events & (V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN |
 100                             V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN);
 101
 102         data_available = events & (V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED |
 103                                    V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ);
 104
 105         if (overrun) {
 106                 /* If there was a FIFO overrun, stop the device */
 107                 v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 108                 params.enable = false;
 109                 /* Mitigate race with cx23885_input_ir_stop() */
 110                 params.shutdown = atomic_read(&dev->ir_input_stopping);
 111                 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 112         }
 113
 114         if (data_available)
 115                 cx23885_input_process_measurements(dev, overrun);
 116
 117         if (overrun) {
 118                 /* If there was a FIFO overrun, clear & restart the device */
 119                 params.enable = true;
 120                 /* Mitigate race with cx23885_input_ir_stop() */
 121                 params.shutdown = atomic_read(&dev->ir_input_stopping);
 122                 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 123         }
 124 }
 125
 126 static int cx23885_input_ir_start(struct cx23885_dev *dev)
 127 {
 128         struct v4l2_subdev_ir_parameters params;
 129
 130         if (dev->sd_ir == NULL)
 131                 return -ENODEV;
 132
 133         atomic_set(&dev->ir_input_stopping, 0);
 134
 135         v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 136         switch (dev->board) {
 137         case CX23885_BOARD_HAUPPAUGE_HVR1850:
 138         case CX23885_BOARD_HAUPPAUGE_HVR1290:
 139         case CX23885_BOARD_HAUPPAUGE_HVR1250:
 140                 /*
 141                  * The IR controller on this board only returns pulse widths.
 142                  * Any other mode setting will fail to set up the device.
 143                 */
 144                 params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
 145                 params.enable = true;
 146                 params.interrupt_enable = true;
 147                 params.shutdown = false;
 148
 149                 /* Setup for baseband compatible with both RC-5 and RC-6A */
 150                 params.modulation = false;
 151                 /* RC-5:  2,222,222 ns = 1/36 kHz * 32 cycles * 2 marks * 1.25*/
 152                 /* RC-6A: 3,333,333 ns = 1/36 kHz * 16 cycles * 6 marks * 1.25*/
 153                 params.max_pulse_width = 3333333; /* ns */
 154                 /* RC-5:    666,667 ns = 1/36 kHz * 32 cycles * 1 mark * 0.75 */
 155                 /* RC-6A:   333,333 ns = 1/36 kHz * 16 cycles * 1 mark * 0.75 */
 156                 params.noise_filter_min_width = 333333; /* ns */
 157                 /*
 158                  * This board has inverted receive sense:
 159                  * mark is received as low logic level;
 160                  * falling edges are detected as rising edges; etc.
 161                  */
 162                 params.invert_level = true;
 163                 break;
 164         case CX23885_BOARD_TEVII_S470:
 165                 /*
 166                  * The IR controller on this board only returns pulse widths.
 167                  * Any other mode setting will fail to set up the device.
 168                  */
 169                 params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
 170                 params.enable = true;
 171                 params.interrupt_enable = true;
 172                 params.shutdown = false;
 173
 174                 /* Setup for a standard NEC protocol */
 175                 params.carrier_freq = 37917; /* Hz, 455 kHz/12 for NEC */
 176                 params.carrier_range_lower = 33000; /* Hz */
 177                 params.carrier_range_upper = 43000; /* Hz */
 178                 params.duty_cycle = 33; /* percent, 33 percent for NEC */
 179
 180                 /*
 181                  * NEC max pulse width: (64/3)/(455 kHz/12) * 16 nec_units
 182                  * (64/3)/(455 kHz/12) * 16 nec_units * 1.375 = 12378022 ns
 183                  */
 184                 params.max_pulse_width = 12378022; /* ns */
 185
 186                 /*
 187                  * NEC noise filter min width: (64/3)/(455 kHz/12) * 1 nec_unit
 188                  * (64/3)/(455 kHz/12) * 1 nec_units * 0.625 = 351648 ns
 189                  */
 190                 params.noise_filter_min_width = 351648; /* ns */
 191
 192                 params.modulation = false;
 193                 params.invert_level = true;
 194                 break;
 195         }
 196         v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 197         return 0;
 198 }
 199
 200 static int cx23885_input_ir_open(void *priv)
 201 {
 202         struct cx23885_kernel_ir *kernel_ir = priv;
 203
 204         if (kernel_ir->cx == NULL)
 205                 return -ENODEV;
 206
 207         return cx23885_input_ir_start(kernel_ir->cx);
 208 }
 209
 210 static void cx23885_input_ir_stop(struct cx23885_dev *dev)
 211 {
 212         struct v4l2_subdev_ir_parameters params;
 213
 214         if (dev->sd_ir == NULL)
 215                 return;
 216
 217         /*
 218          * Stop the sd_ir subdevice from generating notifications and
 219          * scheduling work.
 220          * It is shutdown this way in order to mitigate a race with
 221          * cx23885_input_rx_work_handler() in the overrun case, which could
 222          * re-enable the subdevice.
 223          */
 224         atomic_set(&dev->ir_input_stopping, 1);
 225         v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 226         while (params.shutdown == false) {
 227                 params.enable = false;
 228                 params.interrupt_enable = false;
 229                 params.shutdown = true;
 230                 v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
 231                 v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
 232         }
 233
 234         flush_scheduled_work();
 235 }
 236
 237 static void cx23885_input_ir_close(void *priv)
 238 {
 239         struct cx23885_kernel_ir *kernel_ir = priv;
 240
 241         if (kernel_ir->cx != NULL)
 242                 cx23885_input_ir_stop(kernel_ir->cx);
 243 }
 244
 245 int cx23885_input_init(struct cx23885_dev *dev)
 246 {
 247         struct cx23885_kernel_ir *kernel_ir;
 248         struct input_dev *inp_dev;
 249         struct ir_dev_props *props;
 250
 251         char *rc_map;
 252         enum rc_driver_type driver_type;
 253         unsigned long allowed_protos;
 254
 255         int ret;
 256
 257         /*
 258          * If the IR device (hardware registers, chip, GPIO lines, etc.) isn't
 259          * encapsulated in a v4l2_subdev, then I'm not going to deal with it.
 260          */
 261         if (dev->sd_ir == NULL)
 262                 return -ENODEV;
 263
 264         switch (dev->board) {
 265         case CX23885_BOARD_HAUPPAUGE_HVR1850:
 266         case CX23885_BOARD_HAUPPAUGE_HVR1290:
 267         case CX23885_BOARD_HAUPPAUGE_HVR1250:
 268                 /* Integrated CX2388[58] IR controller */
 269                 driver_type = RC_DRIVER_IR_RAW;
 270                 allowed_protos = IR_TYPE_ALL;
 271                 /* The grey Hauppauge RC-5 remote */
 272                 rc_map = RC_MAP_RC5_HAUPPAUGE_NEW;
 273                 break;
 274         case CX23885_BOARD_TEVII_S470:
 275                 /* Integrated CX23885 IR controller */
 276                 driver_type = RC_DRIVER_IR_RAW;
 277                 allowed_protos = IR_TYPE_ALL;
 278                 /* A guess at the remote */
 279                 rc_map = RC_MAP_TEVII_NEC;
 280                 break;
 281         default:
 282                 return -ENODEV;
 283         }
 284
 285         /* cx23885 board instance kernel IR state */
 286         kernel_ir = kzalloc(sizeof(struct cx23885_kernel_ir), GFP_KERNEL);
 287         if (kernel_ir == NULL)
 288                 return -ENOMEM;
 289
 290         kernel_ir->cx = dev;
 291         kernel_ir->name = kasprintf(GFP_KERNEL, "cx23885 IR (%s)",
 292                                     cx23885_boards[dev->board].name);
 293         kernel_ir->phys = kasprintf(GFP_KERNEL, "pci-%s/ir0",
 294                                     pci_name(dev->pci));
 295
 296         /* input device */
 297         inp_dev = input_allocate_device();
 298         if (inp_dev == NULL) {
 299                 ret = -ENOMEM;
 300                 goto err_out_free;
 301         }
 302
 303         kernel_ir->inp_dev = inp_dev;
 304         inp_dev->name = kernel_ir->name;
 305         inp_dev->phys = kernel_ir->phys;
 306         inp_dev->id.bustype = BUS_PCI;
 307         inp_dev->id.version = 1;
 308         if (dev->pci->subsystem_vendor) {
 309                 inp_dev->id.vendor  = dev->pci->subsystem_vendor;
 310                 inp_dev->id.product = dev->pci->subsystem_device;
 311         } else {
 312                 inp_dev->id.vendor  = dev->pci->vendor;
 313                 inp_dev->id.product = dev->pci->device;
 314         }
 315         inp_dev->dev.parent = &dev->pci->dev;
 316
 317         /* kernel ir device properties */
 318         props = &kernel_ir->props;
 319         props->driver_type = driver_type;
 320         props->allowed_protos = allowed_protos;
 321         props->priv = kernel_ir;
 322         props->open = cx23885_input_ir_open;
 323         props->close = cx23885_input_ir_close;
 324
 325         /* Go */
 326         dev->kernel_ir = kernel_ir;
 327         ret = ir_input_register(inp_dev, rc_map, props, MODULE_NAME);
 328         if (ret)
 329                 goto err_out_stop;
 330
 331         return 0;
 332
 333 err_out_stop:
 334         cx23885_input_ir_stop(dev);
 335         dev->kernel_ir = NULL;
 336         /* TODO: double check clean-up of kernel_ir->inp_dev */
 337 err_out_free:
 338         kfree(kernel_ir->phys);
 339         kfree(kernel_ir->name);
 340         kfree(kernel_ir);
 341         return ret;
 342 }
 343
 344 void cx23885_input_fini(struct cx23885_dev *dev)
 345 {
 346         /* Always stop the IR hardware from generating interrupts */
 347         cx23885_input_ir_stop(dev);
 348
 349         if (dev->kernel_ir == NULL)
 350                 return;
 351         ir_input_unregister(dev->kernel_ir->inp_dev);
 352         kfree(dev->kernel_ir->phys);
 353         kfree(dev->kernel_ir->name);
 354         kfree(dev->kernel_ir);
 355         dev->kernel_ir = NULL;
 356 }