drivers/media/usb/dvb-usb/dtt200u-fe.c

   1 /* Frontend part of the Linux driver for the WideView/ Yakumo/ Hama/
   2  * Typhoon/ Yuan DVB-T USB2.0 receiver.
   3  *
   4  * Copyright (C) 2005 Patrick Boettcher <patrick.boettcher@posteo.de>
   5  *
   6  *      This program is free software; you can redistribute it and/or modify it
   7  *      under the terms of the GNU General Public License as published by the Free
   8  *      Software Foundation, version 2.
   9  *
  10  * see Documentation/dvb/README.dvb-usb for more information
  11  */
  12 #include "dtt200u.h"
  13
  14 struct dtt200u_fe_state {
  15         struct dvb_usb_device *d;
  16
  17         enum fe_status stat;
  18
  19         struct dtv_frontend_properties fep;
  20         struct dvb_frontend frontend;
  21
  22         unsigned char data[80];
  23         struct mutex data_mutex;
  24 };
  25
  26 static int dtt200u_fe_read_status(struct dvb_frontend *fe,
  27                                   enum fe_status *stat)
  28 {
  29         struct dtt200u_fe_state *state = fe->demodulator_priv;
  30         int ret;
  31
  32         mutex_lock(&state->data_mutex);
  33         state->data[0] = GET_TUNE_STATUS;
  34
  35         ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 3, 0);
  36         if (ret < 0) {
  37                 *stat = 0;
  38                 mutex_unlock(&state->data_mutex);
  39                 return ret;
  40         }
  41
  42         switch (state->data[0]) {
  43                 case 0x01:
  44                         *stat = FE_HAS_SIGNAL | FE_HAS_CARRIER |
  45                                 FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
  46                         break;
  47                 case 0x00: /* pending */
  48                         *stat = FE_TIMEDOUT; /* during set_frontend */
  49                         break;
  50                 default:
  51                 case 0x02: /* failed */
  52                         *stat = 0;
  53                         break;
  54         }
  55         mutex_unlock(&state->data_mutex);
  56         return 0;
  57 }
  58
  59 static int dtt200u_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
  60 {
  61         struct dtt200u_fe_state *state = fe->demodulator_priv;
  62         int ret;
  63
  64         mutex_lock(&state->data_mutex);
  65         state->data[0] = GET_VIT_ERR_CNT;
  66
  67         ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 3, 0);
  68         if (ret >= 0)
  69                 *ber = (state->data[0] << 16) | (state->data[1] << 8) | state->data[2];
  70
  71         mutex_unlock(&state->data_mutex);
  72         return ret;
  73 }
  74
  75 static int dtt200u_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
  76 {
  77         struct dtt200u_fe_state *state = fe->demodulator_priv;
  78         int ret;
  79
  80         mutex_lock(&state->data_mutex);
  81         state->data[0] = GET_RS_UNCOR_BLK_CNT;
  82
  83         ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 2, 0);
  84         if (ret >= 0)
  85                 *unc = (state->data[0] << 8) | state->data[1];
  86
  87         mutex_unlock(&state->data_mutex);
  88         return ret;
  89 }
  90
  91 static int dtt200u_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
  92 {
  93         struct dtt200u_fe_state *state = fe->demodulator_priv;
  94         int ret;
  95
  96         mutex_lock(&state->data_mutex);
  97         state->data[0] = GET_AGC;
  98
  99         ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 1, 0);
 100         if (ret >= 0)
 101                 *strength = (state->data[0] << 8) | state->data[0];
 102
 103         mutex_unlock(&state->data_mutex);
 104         return ret;
 105 }
 106
 107 static int dtt200u_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
 108 {
 109         struct dtt200u_fe_state *state = fe->demodulator_priv;
 110         int ret;
 111
 112         mutex_lock(&state->data_mutex);
 113         state->data[0] = GET_SNR;
 114
 115         ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 1, 0);
 116         if (ret >= 0)
 117                 *snr = ~((state->data[0] << 8) | state->data[0]);
 118
 119         mutex_unlock(&state->data_mutex);
 120         return ret;
 121 }
 122
 123 static int dtt200u_fe_init(struct dvb_frontend* fe)
 124 {
 125         struct dtt200u_fe_state *state = fe->demodulator_priv;
 126         int ret;
 127
 128         mutex_lock(&state->data_mutex);
 129         state->data[0] = SET_INIT;
 130
 131         ret = dvb_usb_generic_write(state->d, state->data, 1);
 132         mutex_unlock(&state->data_mutex);
 133
 134         return ret;
 135 }
 136
 137 static int dtt200u_fe_sleep(struct dvb_frontend* fe)
 138 {
 139         return dtt200u_fe_init(fe);
 140 }
 141
 142 static int dtt200u_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
 143 {
 144         tune->min_delay_ms = 1500;
 145         tune->step_size = 0;
 146         tune->max_drift = 0;
 147         return 0;
 148 }
 149
 150 static int dtt200u_fe_set_frontend(struct dvb_frontend *fe)
 151 {
 152         struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
 153         struct dtt200u_fe_state *state = fe->demodulator_priv;
 154         int ret;
 155         u16 freq = fep->frequency / 250000;
 156
 157         mutex_lock(&state->data_mutex);
 158         state->data[0] = SET_BANDWIDTH;
 159         switch (fep->bandwidth_hz) {
 160         case 8000000:
 161                 state->data[1] = 8;
 162                 break;
 163         case 7000000:
 164                 state->data[1] = 7;
 165                 break;
 166         case 6000000:
 167                 state->data[1] = 6;
 168                 break;
 169         default:
 170                 ret = -EINVAL;
 171                 goto ret;
 172         }
 173
 174         ret = dvb_usb_generic_write(state->d, state->data, 2);
 175         if (ret < 0)
 176                 goto ret;
 177
 178         state->data[0] = SET_RF_FREQ;
 179         state->data[1] = freq & 0xff;
 180         state->data[2] = (freq >> 8) & 0xff;
 181         ret = dvb_usb_generic_write(state->d, state->data, 3);
 182         if (ret < 0)
 183                 goto ret;
 184
 185 ret:
 186         mutex_unlock(&state->data_mutex);
 187         return ret;
 188 }
 189
 190 static int dtt200u_fe_get_frontend(struct dvb_frontend* fe,
 191                                    struct dtv_frontend_properties *fep)
 192 {
 193         struct dtt200u_fe_state *state = fe->demodulator_priv;
 194
 195         memcpy(fep, &state->fep, sizeof(struct dtv_frontend_properties));
 196         return 0;
 197 }
 198
 199 static void dtt200u_fe_release(struct dvb_frontend* fe)
 200 {
 201         struct dtt200u_fe_state *state = (struct dtt200u_fe_state*) fe->demodulator_priv;
 202         kfree(state);
 203 }
 204
 205 static struct dvb_frontend_ops dtt200u_fe_ops;
 206
 207 struct dvb_frontend* dtt200u_fe_attach(struct dvb_usb_device *d)
 208 {
 209         struct dtt200u_fe_state* state = NULL;
 210
 211         /* allocate memory for the internal state */
 212         state = kzalloc(sizeof(struct dtt200u_fe_state), GFP_KERNEL);
 213         if (state == NULL)
 214                 goto error;
 215
 216         deb_info("attaching frontend dtt200u\n");
 217
 218         state->d = d;
 219         mutex_init(&state->data_mutex);
 220
 221         memcpy(&state->frontend.ops,&dtt200u_fe_ops,sizeof(struct dvb_frontend_ops));
 222         state->frontend.demodulator_priv = state;
 223
 224         return &state->frontend;
 225 error:
 226         return NULL;
 227 }
 228
 229 static struct dvb_frontend_ops dtt200u_fe_ops = {
 230         .delsys = { SYS_DVBT },
 231         .info = {
 232                 .name                   = "WideView USB DVB-T",
 233                 .frequency_min          = 44250000,
 234                 .frequency_max          = 867250000,
 235                 .frequency_stepsize     = 250000,
 236                 .caps = FE_CAN_INVERSION_AUTO |
 237                                 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 238                                 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 239                                 FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
 240                                 FE_CAN_TRANSMISSION_MODE_AUTO |
 241                                 FE_CAN_GUARD_INTERVAL_AUTO |
 242                                 FE_CAN_RECOVER |
 243                                 FE_CAN_HIERARCHY_AUTO,
 244         },
 245
 246         .release = dtt200u_fe_release,
 247
 248         .init = dtt200u_fe_init,
 249         .sleep = dtt200u_fe_sleep,
 250
 251         .set_frontend = dtt200u_fe_set_frontend,
 252         .get_frontend = dtt200u_fe_get_frontend,
 253         .get_tune_settings = dtt200u_fe_get_tune_settings,
 254
 255         .read_status = dtt200u_fe_read_status,
 256         .read_ber = dtt200u_fe_read_ber,
 257         .read_signal_strength = dtt200u_fe_read_signal_strength,
 258         .read_snr = dtt200u_fe_read_snr,
 259         .read_ucblocks = dtt200u_fe_read_unc_blocks,
 260 };