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
24struct vp7045_fe_state {
25	struct dvb_frontend fe;
26	struct dvb_usb_device *d;
27};
28
29static 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
55static 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
64static 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
72static 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
82static 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
90static int vp7045_fe_init(struct dvb_frontend* fe)
91{
92	return 0;
93}
94
95static int vp7045_fe_sleep(struct dvb_frontend* fe)
96{
97	return 0;
98}
99
100static 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
106static 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
136static void vp7045_fe_release(struct dvb_frontend* fe)
137{
138	struct vp7045_fe_state *state = fe->demodulator_priv;
139	kfree(state);
140}
141
142static struct dvb_frontend_ops vp7045_fe_ops;
143
144struct 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;
155error:
156	return NULL;
157}
158
159
160static 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