1 // SPDX-License-Identifier: GPL-2.0-only
2 /* DVB frontend part of the Linux driver for TwinhanDTV Alpha/MagicBoxII USB2.0
3  * DVB-T receiver.
4  *
5  * Copyright (C) 2004-5 Patrick Boettcher (patrick.boettcher@posteo.de)
6  *
7  * Thanks to Twinhan who kindly provided hardware and information.
8  *
9  * see Documentation/driver-api/media/drivers/dvb-usb.rst for more information
10  */
11 #include "vp7045.h"
12 
13 /* It is a Zarlink MT352 within a Samsung Tuner (DNOS404ZH102A) - 040929 - AAT
14  *
15  * Programming is hidden inside the firmware, so set_frontend is very easy.
16  * Even though there is a Firmware command that one can use to access the demod
17  * via its registers. This is used for status information.
18  */
19 
20 struct vp7045_fe_state {
21 	struct dvb_frontend fe;
22 	struct dvb_usb_device *d;
23 };
24 
25 static int vp7045_fe_read_status(struct dvb_frontend *fe,
26 				 enum fe_status *status)
27 {
28 	struct vp7045_fe_state *state = fe->demodulator_priv;
29 	u8 s0 = vp7045_read_reg(state->d,0x00),
30 	   s1 = vp7045_read_reg(state->d,0x01),
31 	   s3 = vp7045_read_reg(state->d,0x03);
32 
33 	*status = 0;
34 	if (s0 & (1 << 4))
35 		*status |= FE_HAS_CARRIER;
36 	if (s0 & (1 << 1))
37 		*status |= FE_HAS_VITERBI;
38 	if (s0 & (1 << 5))
39 		*status |= FE_HAS_LOCK;
40 	if (s1 & (1 << 1))
41 		*status |= FE_HAS_SYNC;
42 	if (s3 & (1 << 6))
43 		*status |= FE_HAS_SIGNAL;
44 
45 	if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
46 			(FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
47 		*status &= ~FE_HAS_LOCK;
48 
49 	return 0;
50 }
51 
52 static int vp7045_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
53 {
54 	struct vp7045_fe_state *state = fe->demodulator_priv;
55 	*ber = (vp7045_read_reg(state->d, 0x0D) << 16) |
56 	       (vp7045_read_reg(state->d, 0x0E) << 8) |
57 		vp7045_read_reg(state->d, 0x0F);
58 	return 0;
59 }
60 
61 static int vp7045_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
62 {
63 	struct vp7045_fe_state *state = fe->demodulator_priv;
64 	*unc = (vp7045_read_reg(state->d, 0x10) << 8) |
65 		    vp7045_read_reg(state->d, 0x11);
66 	return 0;
67 }
68 
69 static int vp7045_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
70 {
71 	struct vp7045_fe_state *state = fe->demodulator_priv;
72 	u16 signal = (vp7045_read_reg(state->d, 0x14) << 8) |
73 		vp7045_read_reg(state->d, 0x15);
74 
75 	*strength = ~signal;
76 	return 0;
77 }
78 
79 static int vp7045_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
80 {
81 	struct vp7045_fe_state *state = fe->demodulator_priv;
82 	u8 _snr = vp7045_read_reg(state->d, 0x09);
83 	*snr = (_snr << 8) | _snr;
84 	return 0;
85 }
86 
87 static int vp7045_fe_init(struct dvb_frontend* fe)
88 {
89 	return 0;
90 }
91 
92 static int vp7045_fe_sleep(struct dvb_frontend* fe)
93 {
94 	return 0;
95 }
96 
97 static int vp7045_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
98 {
99 	tune->min_delay_ms = 800;
100 	return 0;
101 }
102 
103 static int vp7045_fe_set_frontend(struct dvb_frontend *fe)
104 {
105 	struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
106 	struct vp7045_fe_state *state = fe->demodulator_priv;
107 	u8 buf[5];
108 	u32 freq = fep->frequency / 1000;
109 
110 	buf[0] = (freq >> 16) & 0xff;
111 	buf[1] = (freq >>  8) & 0xff;
112 	buf[2] =  freq        & 0xff;
113 	buf[3] = 0;
114 
115 	switch (fep->bandwidth_hz) {
116 	case 8000000:
117 		buf[4] = 8;
118 		break;
119 	case 7000000:
120 		buf[4] = 7;
121 		break;
122 	case 6000000:
123 		buf[4] = 6;
124 		break;
125 	default:
126 		return -EINVAL;
127 	}
128 
129 	vp7045_usb_op(state->d,LOCK_TUNER_COMMAND,buf,5,NULL,0,200);
130 	return 0;
131 }
132 
133 static void vp7045_fe_release(struct dvb_frontend* fe)
134 {
135 	struct vp7045_fe_state *state = fe->demodulator_priv;
136 	kfree(state);
137 }
138 
139 static const struct dvb_frontend_ops vp7045_fe_ops;
140 
141 struct dvb_frontend * vp7045_fe_attach(struct dvb_usb_device *d)
142 {
143 	struct vp7045_fe_state *s = kzalloc(sizeof(struct vp7045_fe_state), GFP_KERNEL);
144 	if (s == NULL)
145 		goto error;
146 
147 	s->d = d;
148 	memcpy(&s->fe.ops, &vp7045_fe_ops, sizeof(struct dvb_frontend_ops));
149 	s->fe.demodulator_priv = s;
150 
151 	return &s->fe;
152 error:
153 	return NULL;
154 }
155 
156 
157 static const struct dvb_frontend_ops vp7045_fe_ops = {
158 	.delsys = { SYS_DVBT },
159 	.info = {
160 		.name			= "Twinhan VP7045/46 USB DVB-T",
161 		.frequency_min_hz	=  44250 * kHz,
162 		.frequency_max_hz	= 867250 * kHz,
163 		.frequency_stepsize_hz	=      1 * kHz,
164 		.caps = FE_CAN_INVERSION_AUTO |
165 				FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
166 				FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
167 				FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
168 				FE_CAN_TRANSMISSION_MODE_AUTO |
169 				FE_CAN_GUARD_INTERVAL_AUTO |
170 				FE_CAN_RECOVER |
171 				FE_CAN_HIERARCHY_AUTO,
172 	},
173 
174 	.release = vp7045_fe_release,
175 
176 	.init = vp7045_fe_init,
177 	.sleep = vp7045_fe_sleep,
178 
179 	.set_frontend = vp7045_fe_set_frontend,
180 	.get_tune_settings = vp7045_fe_get_tune_settings,
181 
182 	.read_status = vp7045_fe_read_status,
183 	.read_ber = vp7045_fe_read_ber,
184 	.read_signal_strength = vp7045_fe_read_signal_strength,
185 	.read_snr = vp7045_fe_read_snr,
186 	.read_ucblocks = vp7045_fe_read_unc_blocks,
187 };
188