drivers/media/dvb-frontends/cxd2880/cxd2880_integ.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * cxd2880_integ.c
   4  * Sony CXD2880 DVB-T2/T tuner + demodulator driver
   5  * integration layer common functions
   6  *
   7  * Copyright (C) 2016, 2017, 2018 Sony Semiconductor Solutions Corporation
   8  */
   9
  10 #include <linux/ktime.h>
  11 #include <linux/errno.h>
  12
  13 #include "cxd2880_tnrdmd.h"
  14 #include "cxd2880_tnrdmd_mon.h"
  15 #include "cxd2880_integ.h"
  16
  17 int cxd2880_integ_init(struct cxd2880_tnrdmd *tnr_dmd)
  18 {
  19         int ret;
  20         ktime_t start;
  21         u8 cpu_task_completed = 0;
  22
  23         if (!tnr_dmd)
  24                 return -EINVAL;
  25
  26         ret = cxd2880_tnrdmd_init1(tnr_dmd);
  27         if (ret)
  28                 return ret;
  29
  30         start = ktime_get();
  31
  32         while (1) {
  33                 ret =
  34                     cxd2880_tnrdmd_check_internal_cpu_status(tnr_dmd,
  35                                                      &cpu_task_completed);
  36                 if (ret)
  37                         return ret;
  38
  39                 if (cpu_task_completed)
  40                         break;
  41
  42                 if (ktime_to_ms(ktime_sub(ktime_get(), start)) >
  43                                         CXD2880_TNRDMD_WAIT_INIT_TIMEOUT)
  44                         return -ETIMEDOUT;
  45
  46                 usleep_range(CXD2880_TNRDMD_WAIT_INIT_INTVL,
  47                              CXD2880_TNRDMD_WAIT_INIT_INTVL + 1000);
  48         }
  49
  50         return cxd2880_tnrdmd_init2(tnr_dmd);
  51 }
  52
  53 int cxd2880_integ_cancel(struct cxd2880_tnrdmd *tnr_dmd)
  54 {
  55         if (!tnr_dmd)
  56                 return -EINVAL;
  57
  58         atomic_set(&tnr_dmd->cancel, 1);
  59
  60         return 0;
  61 }
  62
  63 int cxd2880_integ_check_cancellation(struct cxd2880_tnrdmd *tnr_dmd)
  64 {
  65         if (!tnr_dmd)
  66                 return -EINVAL;
  67
  68         if (atomic_read(&tnr_dmd->cancel) != 0)
  69                 return -ECANCELED;
  70
  71         return 0;
  72 }