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@posteo.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/media/dvb-drivers/dvb-usb.rst 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,
30 				 enum fe_status *status)
31 {
32 	struct vp7045_fe_state *state = fe->demodulator_priv;
33 	u8 s0 = vp7045_read_reg(state->d,0x00),
34 	   s1 = vp7045_read_reg(state->d,0x01),
35 	   s3 = vp7045_read_reg(state->d,0x03);
36 
37 	*status = 0;
38 	if (s0 & (1 << 4))
39 		*status |= FE_HAS_CARRIER;
40 	if (s0 & (1 << 1))
41 		*status |= FE_HAS_VITERBI;
42 	if (s0 & (1 << 5))
43 		*status |= FE_HAS_LOCK;
44 	if (s1 & (1 << 1))
45 		*status |= FE_HAS_SYNC;
46 	if (s3 & (1 << 6))
47 		*status |= FE_HAS_SIGNAL;
48 
49 	if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
50 			(FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
51 		*status &= ~FE_HAS_LOCK;
52 
53 	return 0;
54 }
55 
56 static int vp7045_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
57 {
58 	struct vp7045_fe_state *state = fe->demodulator_priv;
59 	*ber = (vp7045_read_reg(state->d, 0x0D) << 16) |
60 	       (vp7045_read_reg(state->d, 0x0E) << 8) |
61 		vp7045_read_reg(state->d, 0x0F);
62 	return 0;
63 }
64 
65 static int vp7045_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
66 {
67 	struct vp7045_fe_state *state = fe->demodulator_priv;
68 	*unc = (vp7045_read_reg(state->d, 0x10) << 8) |
69 		    vp7045_read_reg(state->d, 0x11);
70 	return 0;
71 }
72 
73 static int vp7045_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
74 {
75 	struct vp7045_fe_state *state = fe->demodulator_priv;
76 	u16 signal = (vp7045_read_reg(state->d, 0x14) << 8) |
77 		vp7045_read_reg(state->d, 0x15);
78 
79 	*strength = ~signal;
80 	return 0;
81 }
82 
83 static int vp7045_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
84 {
85 	struct vp7045_fe_state *state = fe->demodulator_priv;
86 	u8 _snr = vp7045_read_reg(state->d, 0x09);
87 	*snr = (_snr << 8) | _snr;
88 	return 0;
89 }
90 
91 static int vp7045_fe_init(struct dvb_frontend* fe)
92 {
93 	return 0;
94 }
95 
96 static int vp7045_fe_sleep(struct dvb_frontend* fe)
97 {
98 	return 0;
99 }
100 
101 static int vp7045_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
102 {
103 	tune->min_delay_ms = 800;
104 	return 0;
105 }
106 
107 static int vp7045_fe_set_frontend(struct dvb_frontend *fe)
108 {
109 	struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
110 	struct vp7045_fe_state *state = fe->demodulator_priv;
111 	u8 buf[5];
112 	u32 freq = fep->frequency / 1000;
113 
114 	buf[0] = (freq >> 16) & 0xff;
115 	buf[1] = (freq >>  8) & 0xff;
116 	buf[2] =  freq        & 0xff;
117 	buf[3] = 0;
118 
119 	switch (fep->bandwidth_hz) {
120 	case 8000000:
121 		buf[4] = 8;
122 		break;
123 	case 7000000:
124 		buf[4] = 7;
125 		break;
126 	case 6000000:
127 		buf[4] = 6;
128 		break;
129 	default:
130 		return -EINVAL;
131 	}
132 
133 	vp7045_usb_op(state->d,LOCK_TUNER_COMMAND,buf,5,NULL,0,200);
134 	return 0;
135 }
136 
137 static void vp7045_fe_release(struct dvb_frontend* fe)
138 {
139 	struct vp7045_fe_state *state = fe->demodulator_priv;
140 	kfree(state);
141 }
142 
143 static const struct dvb_frontend_ops vp7045_fe_ops;
144 
145 struct dvb_frontend * vp7045_fe_attach(struct dvb_usb_device *d)
146 {
147 	struct vp7045_fe_state *s = kzalloc(sizeof(struct vp7045_fe_state), GFP_KERNEL);
148 	if (s == NULL)
149 		goto error;
150 
151 	s->d = d;
152 	memcpy(&s->fe.ops, &vp7045_fe_ops, sizeof(struct dvb_frontend_ops));
153 	s->fe.demodulator_priv = s;
154 
155 	return &s->fe;
156 error:
157 	return NULL;
158 }
159 
160 
161 static const struct dvb_frontend_ops vp7045_fe_ops = {
162 	.delsys = { SYS_DVBT },
163 	.info = {
164 		.name			= "Twinhan VP7045/46 USB DVB-T",
165 		.frequency_min_hz	=  44250 * kHz,
166 		.frequency_max_hz	= 867250 * kHz,
167 		.frequency_stepsize_hz	=      1 * kHz,
168 		.caps = FE_CAN_INVERSION_AUTO |
169 				FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
170 				FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
171 				FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
172 				FE_CAN_TRANSMISSION_MODE_AUTO |
173 				FE_CAN_GUARD_INTERVAL_AUTO |
174 				FE_CAN_RECOVER |
175 				FE_CAN_HIERARCHY_AUTO,
176 	},
177 
178 	.release = vp7045_fe_release,
179 
180 	.init = vp7045_fe_init,
181 	.sleep = vp7045_fe_sleep,
182 
183 	.set_frontend = vp7045_fe_set_frontend,
184 	.get_tune_settings = vp7045_fe_get_tune_settings,
185 
186 	.read_status = vp7045_fe_read_status,
187 	.read_ber = vp7045_fe_read_ber,
188 	.read_signal_strength = vp7045_fe_read_signal_strength,
189 	.read_snr = vp7045_fe_read_snr,
190 	.read_ucblocks = vp7045_fe_read_unc_blocks,
191 };
192