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 
14 struct 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 
23 static 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 
46 static 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 
55 static 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 
65 static 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 
74 static 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 
83 static 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 
90 static int dtt200u_fe_sleep(struct dvb_frontend* fe)
91 {
92 	return dtt200u_fe_init(fe);
93 }
94 
95 static 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 
103 static 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 
142 static 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 
150 static 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 
156 static struct dvb_frontend_ops dtt200u_fe_ops;
157 
158 struct 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;
175 error:
176 	return NULL;
177 }
178 
179 static 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