drivers/media/usb/dvb-usb/vp7045-fe.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* DVB frontend part of the Linux driver for TwinhanDTV Alpha/MagicBoxII USB2.0
   3  * DVB-T receiver.
   4  *
   5  * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@posteo.de)
   6  *
   7  * Thanks to Twinhan who kindly provided hardware and information.
   8  *
   9  * see Documentation/driver-api/media/drivers/dvb-usb.rst for more information
  10  */
  11 #include "vp7045.h"
  12
  13 /* It is a Zarlink MT352 within a Samsung Tuner (DNOS404ZH102A) - 040929 - AAT
  14  *
  15  * Programming is hidden inside the firmware, so set_frontend is very easy.
  16  * Even though there is a Firmware command that one can use to access the demod
  17  * via its registers. This is used for status information.
  18  */
  19
  20 struct vp7045_fe_state {
  21         struct dvb_frontend fe;
  22         struct dvb_usb_device *d;
  23 };
  24
  25 static int vp7045_fe_read_status(struct dvb_frontend *fe,
  26                                  enum fe_status *status)
  27 {
  28         struct vp7045_fe_state *state = fe->demodulator_priv;
  29         u8 s0 = vp7045_read_reg(state->d,0x00),
  30            s1 = vp7045_read_reg(state->d,0x01),
  31            s3 = vp7045_read_reg(state->d,0x03);
  32
  33         *status = 0;
  34         if (s0 & (1 << 4))
  35                 *status |= FE_HAS_CARRIER;
  36         if (s0 & (1 << 1))
  37                 *status |= FE_HAS_VITERBI;
  38         if (s0 & (1 << 5))
  39                 *status |= FE_HAS_LOCK;
  40         if (s1 & (1 << 1))
  41                 *status |= FE_HAS_SYNC;
  42         if (s3 & (1 << 6))
  43                 *status |= FE_HAS_SIGNAL;
  44
  45         if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
  46                         (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
  47                 *status &= ~FE_HAS_LOCK;
  48
  49         return 0;
  50 }
  51
  52 static int vp7045_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
  53 {
  54         struct vp7045_fe_state *state = fe->demodulator_priv;
  55         *ber = (vp7045_read_reg(state->d, 0x0D) << 16) |
  56                (vp7045_read_reg(state->d, 0x0E) << 8) |
  57                 vp7045_read_reg(state->d, 0x0F);
  58         return 0;
  59 }
  60
  61 static int vp7045_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
  62 {
  63         struct vp7045_fe_state *state = fe->demodulator_priv;
  64         *unc = (vp7045_read_reg(state->d, 0x10) << 8) |
  65                     vp7045_read_reg(state->d, 0x11);
  66         return 0;
  67 }
  68
  69 static int vp7045_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
  70 {
  71         struct vp7045_fe_state *state = fe->demodulator_priv;
  72         u16 signal = (vp7045_read_reg(state->d, 0x14) << 8) |
  73                 vp7045_read_reg(state->d, 0x15);
  74
  75         *strength = ~signal;
  76         return 0;
  77 }
  78
  79 static int vp7045_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
  80 {
  81         struct vp7045_fe_state *state = fe->demodulator_priv;
  82         u8 _snr = vp7045_read_reg(state->d, 0x09);
  83         *snr = (_snr << 8) | _snr;
  84         return 0;
  85 }
  86
  87 static int vp7045_fe_init(struct dvb_frontend* fe)
  88 {
  89         return 0;
  90 }
  91
  92 static int vp7045_fe_sleep(struct dvb_frontend* fe)
  93 {
  94         return 0;
  95 }
  96
  97 static int vp7045_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
  98 {
  99         tune->min_delay_ms = 800;
 100         return 0;
 101 }
 102
 103 static int vp7045_fe_set_frontend(struct dvb_frontend *fe)
 104 {
 105         struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
 106         struct vp7045_fe_state *state = fe->demodulator_priv;
 107         u8 buf[5];
 108         u32 freq = fep->frequency / 1000;
 109
 110         buf[0] = (freq >> 16) & 0xff;
 111         buf[1] = (freq >>  8) & 0xff;
 112         buf[2] =  freq        & 0xff;
 113         buf[3] = 0;
 114
 115         switch (fep->bandwidth_hz) {
 116         case 8000000:
 117                 buf[4] = 8;
 118                 break;
 119         case 7000000:
 120                 buf[4] = 7;
 121                 break;
 122         case 6000000:
 123                 buf[4] = 6;
 124                 break;
 125         default:
 126                 return -EINVAL;
 127         }
 128
 129         vp7045_usb_op(state->d,LOCK_TUNER_COMMAND,buf,5,NULL,0,200);
 130         return 0;
 131 }
 132
 133 static void vp7045_fe_release(struct dvb_frontend* fe)
 134 {
 135         struct vp7045_fe_state *state = fe->demodulator_priv;
 136         kfree(state);
 137 }
 138
 139 static const struct dvb_frontend_ops vp7045_fe_ops;
 140
 141 struct dvb_frontend * vp7045_fe_attach(struct dvb_usb_device *d)
 142 {
 143         struct vp7045_fe_state *s = kzalloc(sizeof(struct vp7045_fe_state), GFP_KERNEL);
 144         if (s == NULL)
 145                 goto error;
 146
 147         s->d = d;
 148         memcpy(&s->fe.ops, &vp7045_fe_ops, sizeof(struct dvb_frontend_ops));
 149         s->fe.demodulator_priv = s;
 150
 151         return &s->fe;
 152 error:
 153         return NULL;
 154 }
 155
 156
 157 static const struct dvb_frontend_ops vp7045_fe_ops = {
 158         .delsys = { SYS_DVBT },
 159         .info = {
 160                 .name                   = "Twinhan VP7045/46 USB DVB-T",
 161                 .frequency_min_hz       =  44250 * kHz,
 162                 .frequency_max_hz       = 867250 * kHz,
 163                 .frequency_stepsize_hz  =      1 * kHz,
 164                 .caps = FE_CAN_INVERSION_AUTO |
 165                                 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 166                                 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 167                                 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 168                                 FE_CAN_TRANSMISSION_MODE_AUTO |
 169                                 FE_CAN_GUARD_INTERVAL_AUTO |
 170                                 FE_CAN_RECOVER |
 171                                 FE_CAN_HIERARCHY_AUTO,
 172         },
 173
 174         .release = vp7045_fe_release,
 175
 176         .init = vp7045_fe_init,
 177         .sleep = vp7045_fe_sleep,
 178
 179         .set_frontend = vp7045_fe_set_frontend,
 180         .get_tune_settings = vp7045_fe_get_tune_settings,
 181
 182         .read_status = vp7045_fe_read_status,
 183         .read_ber = vp7045_fe_read_ber,
 184         .read_signal_strength = vp7045_fe_read_signal_strength,
 185         .read_snr = vp7045_fe_read_snr,
 186         .read_ucblocks = vp7045_fe_read_unc_blocks,
 187 };