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 (patrick.boettcher@desy.de)
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 
24 struct vp7045_fe_state {
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 {
31 	struct vp7045_fe_state *state = fe->demodulator_priv;
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)) !=
49 			(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 {
57 	struct vp7045_fe_state *state = fe->demodulator_priv;
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 
144 struct dvb_frontend * vp7045_fe_attach(struct dvb_usb_device *d)
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 |
168 				FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
169 				FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
170 				FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
171 				FE_CAN_TRANSMISSION_MODE_AUTO |
172 				FE_CAN_GUARD_INTERVAL_AUTO |
173 				FE_CAN_RECOVER |
174 				FE_CAN_HIERARCHY_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 };
191