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vp7045-fe.c
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1 /* DVB frontend part of the Linux driver for TwinhanDTV Alpha/MagicBoxII USB2.0
2  * DVB-T receiver.
3  *
4  * Copyright (C) 2004-5 Patrick Boettcher ([email protected])
5  *
6  * Thanks to Twinhan who kindly provided hardware and information.
7  *
8  * This program is free software; you can redistribute it and/or modify it
9  * under the terms of the GNU General Public License as published by the Free
10  * Software Foundation, version 2.
11  *
12  * see Documentation/dvb/README.dvb-usb for more information
13  *
14  */
15 #include "vp7045.h"
16 
17 /* It is a Zarlink MT352 within a Samsung Tuner (DNOS404ZH102A) - 040929 - AAT
18  *
19  * Programming is hidden inside the firmware, so set_frontend is very easy.
20  * Even though there is a Firmware command that one can use to access the demod
21  * via its registers. This is used for status information.
22  */
23 
25  struct dvb_frontend fe;
26  struct dvb_usb_device *d;
27 };
28 
29 static int vp7045_fe_read_status(struct dvb_frontend* fe, fe_status_t *status)
30 {
32  u8 s0 = vp7045_read_reg(state->d,0x00),
33  s1 = vp7045_read_reg(state->d,0x01),
34  s3 = vp7045_read_reg(state->d,0x03);
35 
36  *status = 0;
37  if (s0 & (1 << 4))
38  *status |= FE_HAS_CARRIER;
39  if (s0 & (1 << 1))
40  *status |= FE_HAS_VITERBI;
41  if (s0 & (1 << 5))
42  *status |= FE_HAS_LOCK;
43  if (s1 & (1 << 1))
44  *status |= FE_HAS_SYNC;
45  if (s3 & (1 << 6))
46  *status |= FE_HAS_SIGNAL;
47 
48  if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
50  *status &= ~FE_HAS_LOCK;
51 
52  return 0;
53 }
54 
55 static int vp7045_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
56 {
58  *ber = (vp7045_read_reg(state->d, 0x0D) << 16) |
59  (vp7045_read_reg(state->d, 0x0E) << 8) |
60  vp7045_read_reg(state->d, 0x0F);
61  return 0;
62 }
63 
64 static int vp7045_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
65 {
66  struct vp7045_fe_state *state = fe->demodulator_priv;
67  *unc = (vp7045_read_reg(state->d, 0x10) << 8) |
68  vp7045_read_reg(state->d, 0x11);
69  return 0;
70 }
71 
72 static int vp7045_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
73 {
74  struct vp7045_fe_state *state = fe->demodulator_priv;
75  u16 signal = (vp7045_read_reg(state->d, 0x14) << 8) |
76  vp7045_read_reg(state->d, 0x15);
77 
78  *strength = ~signal;
79  return 0;
80 }
81 
82 static int vp7045_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
83 {
84  struct vp7045_fe_state *state = fe->demodulator_priv;
85  u8 _snr = vp7045_read_reg(state->d, 0x09);
86  *snr = (_snr << 8) | _snr;
87  return 0;
88 }
89 
90 static int vp7045_fe_init(struct dvb_frontend* fe)
91 {
92  return 0;
93 }
94 
95 static int vp7045_fe_sleep(struct dvb_frontend* fe)
96 {
97  return 0;
98 }
99 
100 static int vp7045_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
101 {
102  tune->min_delay_ms = 800;
103  return 0;
104 }
105 
106 static int vp7045_fe_set_frontend(struct dvb_frontend *fe)
107 {
108  struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
109  struct vp7045_fe_state *state = fe->demodulator_priv;
110  u8 buf[5];
111  u32 freq = fep->frequency / 1000;
112 
113  buf[0] = (freq >> 16) & 0xff;
114  buf[1] = (freq >> 8) & 0xff;
115  buf[2] = freq & 0xff;
116  buf[3] = 0;
117 
118  switch (fep->bandwidth_hz) {
119  case 8000000:
120  buf[4] = 8;
121  break;
122  case 7000000:
123  buf[4] = 7;
124  break;
125  case 6000000:
126  buf[4] = 6;
127  break;
128  default:
129  return -EINVAL;
130  }
131 
132  vp7045_usb_op(state->d,LOCK_TUNER_COMMAND,buf,5,NULL,0,200);
133  return 0;
134 }
135 
136 static void vp7045_fe_release(struct dvb_frontend* fe)
137 {
138  struct vp7045_fe_state *state = fe->demodulator_priv;
139  kfree(state);
140 }
141 
142 static struct dvb_frontend_ops vp7045_fe_ops;
143 
145 {
146  struct vp7045_fe_state *s = kzalloc(sizeof(struct vp7045_fe_state), GFP_KERNEL);
147  if (s == NULL)
148  goto error;
149 
150  s->d = d;
151  memcpy(&s->fe.ops, &vp7045_fe_ops, sizeof(struct dvb_frontend_ops));
152  s->fe.demodulator_priv = s;
153 
154  return &s->fe;
155 error:
156  return NULL;
157 }
158 
159 
160 static struct dvb_frontend_ops vp7045_fe_ops = {
161  .delsys = { SYS_DVBT },
162  .info = {
163  .name = "Twinhan VP7045/46 USB DVB-T",
164  .frequency_min = 44250000,
165  .frequency_max = 867250000,
166  .frequency_stepsize = 1000,
167  .caps = FE_CAN_INVERSION_AUTO |
175  },
176 
177  .release = vp7045_fe_release,
178 
179  .init = vp7045_fe_init,
180  .sleep = vp7045_fe_sleep,
181 
182  .set_frontend = vp7045_fe_set_frontend,
183  .get_tune_settings = vp7045_fe_get_tune_settings,
184 
185  .read_status = vp7045_fe_read_status,
186  .read_ber = vp7045_fe_read_ber,
187  .read_signal_strength = vp7045_fe_read_signal_strength,
188  .read_snr = vp7045_fe_read_snr,
189  .read_ucblocks = vp7045_fe_read_unc_blocks,
190 };