drivers/media/platform/vivid/vivid-rds-gen.h

   1 /*
   2  * vivid-rds-gen.h - rds (radio data system) generator support functions.
   3  *
   4  * Copyright 2014 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
   5  *
   6  * This program is free software; you may redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  11  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  12  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  13  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  14  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  15  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  16  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  17  * SOFTWARE.
  18  */
  19
  20 #ifndef _VIVID_RDS_GEN_H_
  21 #define _VIVID_RDS_GEN_H_
  22
  23 /*
  24  * It takes almost exactly 5 seconds to transmit 57 RDS groups.
  25  * Each group has 4 blocks and each block has a payload of 16 bits + a
  26  * block identification. The driver will generate the contents of these
  27  * 57 groups only when necessary and it will just be played continuously.
  28  */
  29 #define VIVID_RDS_GEN_GROUPS 57
  30 #define VIVID_RDS_GEN_BLKS_PER_GRP 4
  31 #define VIVID_RDS_GEN_BLOCKS (VIVID_RDS_GEN_BLKS_PER_GRP * VIVID_RDS_GEN_GROUPS)
  32 #define VIVID_RDS_NSEC_PER_BLK (u32)(5ull * NSEC_PER_SEC / VIVID_RDS_GEN_BLOCKS)
  33
  34 struct vivid_rds_gen {
  35         struct v4l2_rds_data    data[VIVID_RDS_GEN_BLOCKS];
  36         bool                    use_rbds;
  37         u16                     picode;
  38         u8                      pty;
  39         bool                    mono_stereo;
  40         bool                    art_head;
  41         bool                    compressed;
  42         bool                    dyn_pty;
  43         bool                    ta;
  44         bool                    tp;
  45         bool                    ms;
  46         char                    psname[8 + 1];
  47         char                    radiotext[64 + 1];
  48 };
  49
  50 void vivid_rds_gen_fill(struct vivid_rds_gen *rds, unsigned freq,
  51                     bool use_alternate);
  52 void vivid_rds_generate(struct vivid_rds_gen *rds);
  53
  54 #endif