1/* Frontend part of the Linux driver for the WideView/ Yakumo/ Hama/
2 * Typhoon/ Yuan DVB-T USB2.0 receiver.
3 *
4 * Copyright (C) 2005 Patrick Boettcher <patrick.boettcher@desy.de>
5 *
6 *	This program is free software; you can redistribute it and/or modify it
7 *	under the terms of the GNU General Public License as published by the Free
8 *	Software Foundation, version 2.
9 *
10 * see Documentation/dvb/README.dvb-usb for more information
11 */
12#include "dtt200u.h"
13
14struct dtt200u_fe_state {
15	struct dvb_usb_device *d;
16
17	fe_status_t stat;
18
19	struct dtv_frontend_properties fep;
20	struct dvb_frontend frontend;
21};
22
23static int dtt200u_fe_read_status(struct dvb_frontend* fe, fe_status_t *stat)
24{
25	struct dtt200u_fe_state *state = fe->demodulator_priv;
26	u8 st = GET_TUNE_STATUS, b[3];
27
28	dvb_usb_generic_rw(state->d,&st,1,b,3,0);
29
30	switch (b[0]) {
31		case 0x01:
32			*stat = FE_HAS_SIGNAL | FE_HAS_CARRIER |
33				FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
34			break;
35		case 0x00: /* pending */
36			*stat = FE_TIMEDOUT; /* during set_frontend */
37			break;
38		default:
39		case 0x02: /* failed */
40			*stat = 0;
41			break;
42	}
43	return 0;
44}
45
46static int dtt200u_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
47{
48	struct dtt200u_fe_state *state = fe->demodulator_priv;
49	u8 bw = GET_VIT_ERR_CNT,b[3];
50	dvb_usb_generic_rw(state->d,&bw,1,b,3,0);
51	*ber = (b[0] << 16) | (b[1] << 8) | b[2];
52	return 0;
53}
54
55static int dtt200u_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
56{
57	struct dtt200u_fe_state *state = fe->demodulator_priv;
58	u8 bw = GET_RS_UNCOR_BLK_CNT,b[2];
59
60	dvb_usb_generic_rw(state->d,&bw,1,b,2,0);
61	*unc = (b[0] << 8) | b[1];
62	return 0;
63}
64
65static int dtt200u_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
66{
67	struct dtt200u_fe_state *state = fe->demodulator_priv;
68	u8 bw = GET_AGC, b;
69	dvb_usb_generic_rw(state->d,&bw,1,&b,1,0);
70	*strength = (b << 8) | b;
71	return 0;
72}
73
74static int dtt200u_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
75{
76	struct dtt200u_fe_state *state = fe->demodulator_priv;
77	u8 bw = GET_SNR,br;
78	dvb_usb_generic_rw(state->d,&bw,1,&br,1,0);
79	*snr = ~((br << 8) | br);
80	return 0;
81}
82
83static int dtt200u_fe_init(struct dvb_frontend* fe)
84{
85	struct dtt200u_fe_state *state = fe->demodulator_priv;
86	u8 b = SET_INIT;
87	return dvb_usb_generic_write(state->d,&b,1);
88}
89
90static int dtt200u_fe_sleep(struct dvb_frontend* fe)
91{
92	return dtt200u_fe_init(fe);
93}
94
95static int dtt200u_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
96{
97	tune->min_delay_ms = 1500;
98	tune->step_size = 0;
99	tune->max_drift = 0;
100	return 0;
101}
102
103static int dtt200u_fe_set_frontend(struct dvb_frontend *fe)
104{
105	struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
106	struct dtt200u_fe_state *state = fe->demodulator_priv;
107	int i;
108	fe_status_t st;
109	u16 freq = fep->frequency / 250000;
110	u8 bwbuf[2] = { SET_BANDWIDTH, 0 },freqbuf[3] = { SET_RF_FREQ, 0, 0 };
111
112	switch (fep->bandwidth_hz) {
113	case 8000000:
114		bwbuf[1] = 8;
115		break;
116	case 7000000:
117		bwbuf[1] = 7;
118		break;
119	case 6000000:
120		bwbuf[1] = 6;
121		break;
122	default:
123		return -EINVAL;
124	}
125
126	dvb_usb_generic_write(state->d,bwbuf,2);
127
128	freqbuf[1] = freq & 0xff;
129	freqbuf[2] = (freq >> 8) & 0xff;
130	dvb_usb_generic_write(state->d,freqbuf,3);
131
132	for (i = 0; i < 30; i++) {
133		msleep(20);
134		dtt200u_fe_read_status(fe, &st);
135		if (st & FE_TIMEDOUT)
136			continue;
137	}
138
139	return 0;
140}
141
142static int dtt200u_fe_get_frontend(struct dvb_frontend* fe)
143{
144	struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
145	struct dtt200u_fe_state *state = fe->demodulator_priv;
146	memcpy(fep, &state->fep, sizeof(struct dtv_frontend_properties));
147	return 0;
148}
149
150static void dtt200u_fe_release(struct dvb_frontend* fe)
151{
152	struct dtt200u_fe_state *state = (struct dtt200u_fe_state*) fe->demodulator_priv;
153	kfree(state);
154}
155
156static struct dvb_frontend_ops dtt200u_fe_ops;
157
158struct dvb_frontend* dtt200u_fe_attach(struct dvb_usb_device *d)
159{
160	struct dtt200u_fe_state* state = NULL;
161
162	/* allocate memory for the internal state */
163	state = kzalloc(sizeof(struct dtt200u_fe_state), GFP_KERNEL);
164	if (state == NULL)
165		goto error;
166
167	deb_info("attaching frontend dtt200u\n");
168
169	state->d = d;
170
171	memcpy(&state->frontend.ops,&dtt200u_fe_ops,sizeof(struct dvb_frontend_ops));
172	state->frontend.demodulator_priv = state;
173
174	return &state->frontend;
175error:
176	return NULL;
177}
178
179static struct dvb_frontend_ops dtt200u_fe_ops = {
180	.delsys = { SYS_DVBT },
181	.info = {
182		.name			= "WideView USB DVB-T",
183		.frequency_min		= 44250000,
184		.frequency_max		= 867250000,
185		.frequency_stepsize	= 250000,
186		.caps = FE_CAN_INVERSION_AUTO |
187				FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
188				FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
189				FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
190				FE_CAN_TRANSMISSION_MODE_AUTO |
191				FE_CAN_GUARD_INTERVAL_AUTO |
192				FE_CAN_RECOVER |
193				FE_CAN_HIERARCHY_AUTO,
194	},
195
196	.release = dtt200u_fe_release,
197
198	.init = dtt200u_fe_init,
199	.sleep = dtt200u_fe_sleep,
200
201	.set_frontend = dtt200u_fe_set_frontend,
202	.get_frontend = dtt200u_fe_get_frontend,
203	.get_tune_settings = dtt200u_fe_get_tune_settings,
204
205	.read_status = dtt200u_fe_read_status,
206	.read_ber = dtt200u_fe_read_ber,
207	.read_signal_strength = dtt200u_fe_read_signal_strength,
208	.read_snr = dtt200u_fe_read_snr,
209	.read_ucblocks = dtt200u_fe_read_unc_blocks,
210};
211