drivers/media/dvb/dvb-usb/gp8psk-fe.c

   1 /* DVB USB compliant Linux driver for the
   2  *  - GENPIX 8pks/qpsk USB2.0 DVB-S module
   3  *
   4  * Copyright (C) 2006 Alan Nisota (alannisota@gmail.com)
   5  *
   6  * Thanks to GENPIX for the sample code used to implement this module.
   7  *
   8  * This module is based off the vp7045 and vp702x modules
   9  *
  10  *      This program is free software; you can redistribute it and/or modify it
  11  *      under the terms of the GNU General Public License as published by the Free
  12  *      Software Foundation, version 2.
  13  *
  14  * see Documentation/dvb/README.dvb-usb for more information
  15  */
  16 #include "gp8psk.h"
  17
  18 struct gp8psk_fe_state {
  19         struct dvb_frontend fe;
  20
  21         struct dvb_usb_device *d;
  22
  23         u16 snr;
  24
  25         unsigned long next_snr_check;
  26 };
  27
  28 static int gp8psk_fe_read_status(struct dvb_frontend* fe, fe_status_t *status)
  29 {
  30         struct gp8psk_fe_state *st = fe->demodulator_priv;
  31         u8 lock;
  32
  33         if (gp8psk_usb_in_op(st->d, GET_SIGNAL_LOCK, 0, 0, &lock,1))
  34                 return -EINVAL;
  35
  36         if (lock)
  37                 *status = FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI | FE_HAS_SIGNAL | FE_HAS_CARRIER;
  38         else
  39                 *status = 0;
  40
  41         return 0;
  42 }
  43
  44 /* not supported by this Frontend */
  45 static int gp8psk_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
  46 {
  47         (void) fe;
  48         *ber = 0;
  49         return 0;
  50 }
  51
  52 /* not supported by this Frontend */
  53 static int gp8psk_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
  54 {
  55         (void) fe;
  56         *unc = 0;
  57         return 0;
  58 }
  59
  60 static int gp8psk_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
  61 {
  62         struct gp8psk_fe_state *st = fe->demodulator_priv;
  63         u8 buf[2];
  64
  65         if (time_after(jiffies,st->next_snr_check)) {
  66                 gp8psk_usb_in_op(st->d,GET_SIGNAL_STRENGTH,0,0,buf,2);
  67                 *snr = (int)(buf[1]) << 8 | buf[0];
  68                 /* snr is reported in dBu*256 */
  69                 /* snr / 38.4 ~= 100% strength */
  70                 /* snr * 17 returns 100% strength as 65535 */
  71                 if (*snr <= 3855)
  72                         *snr = (*snr<<4) + *snr; // snr * 17
  73                 else
  74                         *snr = 65535;
  75                 st->next_snr_check = jiffies + (10*HZ)/1000;
  76         } else {
  77                 *snr = st->snr;
  78         }
  79         return 0;
  80 }
  81
  82 static int gp8psk_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
  83 {
  84         return gp8psk_fe_read_snr(fe, strength);
  85 }
  86
  87 static int gp8psk_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
  88 {
  89         tune->min_delay_ms = 800;
  90         return 0;
  91 }
  92
  93 static int gp8psk_fe_set_frontend(struct dvb_frontend* fe,
  94                                   struct dvb_frontend_parameters *fep)
  95 {
  96         struct gp8psk_fe_state *state = fe->demodulator_priv;
  97         u8 cmd[10];
  98         u32 freq = fep->frequency * 1000;
  99
 100         cmd[4] = freq         & 0xff;
 101         cmd[5] = (freq >> 8)  & 0xff;
 102         cmd[6] = (freq >> 16) & 0xff;
 103         cmd[7] = (freq >> 24) & 0xff;
 104
 105         switch(fe->ops.info.type) {
 106         case FE_QPSK:
 107                 cmd[0] =  fep->u.qpsk.symbol_rate        & 0xff;
 108                 cmd[1] = (fep->u.qpsk.symbol_rate >>  8) & 0xff;
 109                 cmd[2] = (fep->u.qpsk.symbol_rate >> 16) & 0xff;
 110                 cmd[3] = (fep->u.qpsk.symbol_rate >> 24) & 0xff;
 111                 cmd[8] = ADV_MOD_DVB_QPSK;
 112                 cmd[9] = 0x03; /*ADV_MOD_FEC_XXX*/
 113                 break;
 114         default:
 115                 // other modes are unsuported right now
 116                 cmd[0] = 0;
 117                 cmd[1] = 0;
 118                 cmd[2] = 0;
 119                 cmd[3] = 0;
 120                 cmd[8] = 0;
 121                 cmd[9] = 0;
 122                 break;
 123         }
 124
 125         gp8psk_usb_out_op(state->d,TUNE_8PSK,0,0,cmd,10);
 126
 127         state->next_snr_check = jiffies;
 128
 129         return 0;
 130 }
 131
 132 static int gp8psk_fe_get_frontend(struct dvb_frontend* fe,
 133                                   struct dvb_frontend_parameters *fep)
 134 {
 135         return 0;
 136 }
 137
 138
 139 static int gp8psk_fe_send_diseqc_msg (struct dvb_frontend* fe,
 140                                     struct dvb_diseqc_master_cmd *m)
 141 {
 142         struct gp8psk_fe_state *st = fe->demodulator_priv;
 143
 144         deb_fe("%s\n",__FUNCTION__);
 145
 146         if (gp8psk_usb_out_op(st->d,SEND_DISEQC_COMMAND, m->msg[0], 0,
 147                         m->msg, m->msg_len)) {
 148                 return -EINVAL;
 149         }
 150         return 0;
 151 }
 152
 153 static int gp8psk_fe_send_diseqc_burst (struct dvb_frontend* fe,
 154                                     fe_sec_mini_cmd_t burst)
 155 {
 156         struct gp8psk_fe_state *st = fe->demodulator_priv;
 157         u8 cmd;
 158
 159         deb_fe("%s\n",__FUNCTION__);
 160
 161         /* These commands are certainly wrong */
 162         cmd = (burst == SEC_MINI_A) ? 0x00 : 0x01;
 163
 164         if (gp8psk_usb_out_op(st->d,SEND_DISEQC_COMMAND, cmd, 0,
 165                         &cmd, 0)) {
 166                 return -EINVAL;
 167         }
 168         return 0;
 169 }
 170
 171 static int gp8psk_fe_set_tone (struct dvb_frontend* fe, fe_sec_tone_mode_t tone)
 172 {
 173         struct gp8psk_fe_state* state = fe->demodulator_priv;
 174
 175         if (gp8psk_usb_out_op(state->d,SET_22KHZ_TONE,
 176                  (tone == SEC_TONE_ON), 0, NULL, 0)) {
 177                 return -EINVAL;
 178         }
 179         return 0;
 180 }
 181
 182 static int gp8psk_fe_set_voltage (struct dvb_frontend* fe, fe_sec_voltage_t voltage)
 183 {
 184         struct gp8psk_fe_state* state = fe->demodulator_priv;
 185
 186         if (gp8psk_usb_out_op(state->d,SET_LNB_VOLTAGE,
 187                          voltage == SEC_VOLTAGE_18, 0, NULL, 0)) {
 188                 return -EINVAL;
 189         }
 190         return 0;
 191 }
 192
 193 static int gp8psk_fe_send_legacy_dish_cmd (struct dvb_frontend* fe, unsigned long sw_cmd)
 194 {
 195         struct gp8psk_fe_state* state = fe->demodulator_priv;
 196         u8 cmd = sw_cmd & 0x7f;
 197
 198         if (gp8psk_usb_out_op(state->d,SET_DN_SWITCH, cmd, 0,
 199                         NULL, 0)) {
 200                 return -EINVAL;
 201         }
 202         if (gp8psk_usb_out_op(state->d,SET_LNB_VOLTAGE, !!(sw_cmd & 0x80),
 203                         0, NULL, 0)) {
 204                 return -EINVAL;
 205         }
 206
 207         return 0;
 208 }
 209
 210 static void gp8psk_fe_release(struct dvb_frontend* fe)
 211 {
 212         struct gp8psk_fe_state *state = fe->demodulator_priv;
 213         kfree(state);
 214 }
 215
 216 static struct dvb_frontend_ops gp8psk_fe_ops;
 217
 218 struct dvb_frontend * gp8psk_fe_attach(struct dvb_usb_device *d)
 219 {
 220         struct gp8psk_fe_state *s = kzalloc(sizeof(struct gp8psk_fe_state), GFP_KERNEL);
 221         if (s == NULL)
 222                 goto error;
 223
 224         s->d = d;
 225         memcpy(&s->fe.ops, &gp8psk_fe_ops, sizeof(struct dvb_frontend_ops));
 226         s->fe.demodulator_priv = s;
 227
 228         goto success;
 229 error:
 230         return NULL;
 231 success:
 232         return &s->fe;
 233 }
 234
 235
 236 static struct dvb_frontend_ops gp8psk_fe_ops = {
 237         .info = {
 238                 .name                   = "Genpix 8psk-USB DVB-S",
 239                 .type                   = FE_QPSK,
 240                 .frequency_min          = 950000,
 241                 .frequency_max          = 2150000,
 242                 .frequency_stepsize     = 100,
 243                 .symbol_rate_min        = 1000000,
 244                 .symbol_rate_max        = 45000000,
 245                 .symbol_rate_tolerance  = 500,  /* ppm */
 246                 .caps = FE_CAN_INVERSION_AUTO |
 247                                 FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
 248                                 FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
 249                                 FE_CAN_QPSK
 250         },
 251
 252         .release = gp8psk_fe_release,
 253
 254         .init = NULL,
 255         .sleep = NULL,
 256
 257         .set_frontend = gp8psk_fe_set_frontend,
 258         .get_frontend = gp8psk_fe_get_frontend,
 259         .get_tune_settings = gp8psk_fe_get_tune_settings,
 260
 261         .read_status = gp8psk_fe_read_status,
 262         .read_ber = gp8psk_fe_read_ber,
 263         .read_signal_strength = gp8psk_fe_read_signal_strength,
 264         .read_snr = gp8psk_fe_read_snr,
 265         .read_ucblocks = gp8psk_fe_read_unc_blocks,
 266
 267         .diseqc_send_master_cmd = gp8psk_fe_send_diseqc_msg,
 268         .diseqc_send_burst = gp8psk_fe_send_diseqc_burst,
 269         .set_tone = gp8psk_fe_set_tone,
 270         .set_voltage = gp8psk_fe_set_voltage,
 271         .dishnetwork_send_legacy_command = gp8psk_fe_send_legacy_dish_cmd,
 272 };