1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Frontend part of the Linux driver for the WideView/ Yakumo/ Hama/
3  * Typhoon/ Yuan DVB-T USB2.0 receiver.
4  *
5  * Copyright (C) 2005 Patrick Boettcher <patrick.boettcher@posteo.de>
6  *
7  * see Documentation/driver-api/media/drivers/dvb-usb.rst for more information
8  */
9 #include "dtt200u.h"
10 
11 struct dtt200u_fe_state {
12 	struct dvb_usb_device *d;
13 
14 	enum fe_status stat;
15 
16 	struct dtv_frontend_properties fep;
17 	struct dvb_frontend frontend;
18 
19 	unsigned char data[80];
20 	struct mutex data_mutex;
21 };
22 
23 static int dtt200u_fe_read_status(struct dvb_frontend *fe,
24 				  enum fe_status *stat)
25 {
26 	struct dtt200u_fe_state *state = fe->demodulator_priv;
27 	int ret;
28 
29 	mutex_lock(&state->data_mutex);
30 	state->data[0] = GET_TUNE_STATUS;
31 
32 	ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 3, 0);
33 	if (ret < 0) {
34 		*stat = 0;
35 		mutex_unlock(&state->data_mutex);
36 		return ret;
37 	}
38 
39 	switch (state->data[0]) {
40 		case 0x01:
41 			*stat = FE_HAS_SIGNAL | FE_HAS_CARRIER |
42 				FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
43 			break;
44 		case 0x00: /* pending */
45 			*stat = FE_TIMEDOUT; /* during set_frontend */
46 			break;
47 		default:
48 		case 0x02: /* failed */
49 			*stat = 0;
50 			break;
51 	}
52 	mutex_unlock(&state->data_mutex);
53 	return 0;
54 }
55 
56 static int dtt200u_fe_read_ber(struct dvb_frontend* fe, u32 *ber)
57 {
58 	struct dtt200u_fe_state *state = fe->demodulator_priv;
59 	int ret;
60 
61 	mutex_lock(&state->data_mutex);
62 	state->data[0] = GET_VIT_ERR_CNT;
63 
64 	ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 3, 0);
65 	if (ret >= 0)
66 		*ber = (state->data[0] << 16) | (state->data[1] << 8) | state->data[2];
67 
68 	mutex_unlock(&state->data_mutex);
69 	return ret;
70 }
71 
72 static int dtt200u_fe_read_unc_blocks(struct dvb_frontend* fe, u32 *unc)
73 {
74 	struct dtt200u_fe_state *state = fe->demodulator_priv;
75 	int ret;
76 
77 	mutex_lock(&state->data_mutex);
78 	state->data[0] = GET_RS_UNCOR_BLK_CNT;
79 
80 	ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 2, 0);
81 	if (ret >= 0)
82 		*unc = (state->data[0] << 8) | state->data[1];
83 
84 	mutex_unlock(&state->data_mutex);
85 	return ret;
86 }
87 
88 static int dtt200u_fe_read_signal_strength(struct dvb_frontend* fe, u16 *strength)
89 {
90 	struct dtt200u_fe_state *state = fe->demodulator_priv;
91 	int ret;
92 
93 	mutex_lock(&state->data_mutex);
94 	state->data[0] = GET_AGC;
95 
96 	ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 1, 0);
97 	if (ret >= 0)
98 		*strength = (state->data[0] << 8) | state->data[0];
99 
100 	mutex_unlock(&state->data_mutex);
101 	return ret;
102 }
103 
104 static int dtt200u_fe_read_snr(struct dvb_frontend* fe, u16 *snr)
105 {
106 	struct dtt200u_fe_state *state = fe->demodulator_priv;
107 	int ret;
108 
109 	mutex_lock(&state->data_mutex);
110 	state->data[0] = GET_SNR;
111 
112 	ret = dvb_usb_generic_rw(state->d, state->data, 1, state->data, 1, 0);
113 	if (ret >= 0)
114 		*snr = ~((state->data[0] << 8) | state->data[0]);
115 
116 	mutex_unlock(&state->data_mutex);
117 	return ret;
118 }
119 
120 static int dtt200u_fe_init(struct dvb_frontend* fe)
121 {
122 	struct dtt200u_fe_state *state = fe->demodulator_priv;
123 	int ret;
124 
125 	mutex_lock(&state->data_mutex);
126 	state->data[0] = SET_INIT;
127 
128 	ret = dvb_usb_generic_write(state->d, state->data, 1);
129 	mutex_unlock(&state->data_mutex);
130 
131 	return ret;
132 }
133 
134 static int dtt200u_fe_sleep(struct dvb_frontend* fe)
135 {
136 	return dtt200u_fe_init(fe);
137 }
138 
139 static int dtt200u_fe_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *tune)
140 {
141 	tune->min_delay_ms = 1500;
142 	tune->step_size = 0;
143 	tune->max_drift = 0;
144 	return 0;
145 }
146 
147 static int dtt200u_fe_set_frontend(struct dvb_frontend *fe)
148 {
149 	struct dtv_frontend_properties *fep = &fe->dtv_property_cache;
150 	struct dtt200u_fe_state *state = fe->demodulator_priv;
151 	int ret;
152 	u16 freq = fep->frequency / 250000;
153 
154 	mutex_lock(&state->data_mutex);
155 	state->data[0] = SET_BANDWIDTH;
156 	switch (fep->bandwidth_hz) {
157 	case 8000000:
158 		state->data[1] = 8;
159 		break;
160 	case 7000000:
161 		state->data[1] = 7;
162 		break;
163 	case 6000000:
164 		state->data[1] = 6;
165 		break;
166 	default:
167 		ret = -EINVAL;
168 		goto ret;
169 	}
170 
171 	ret = dvb_usb_generic_write(state->d, state->data, 2);
172 	if (ret < 0)
173 		goto ret;
174 
175 	state->data[0] = SET_RF_FREQ;
176 	state->data[1] = freq & 0xff;
177 	state->data[2] = (freq >> 8) & 0xff;
178 	ret = dvb_usb_generic_write(state->d, state->data, 3);
179 	if (ret < 0)
180 		goto ret;
181 
182 ret:
183 	mutex_unlock(&state->data_mutex);
184 	return ret;
185 }
186 
187 static int dtt200u_fe_get_frontend(struct dvb_frontend* fe,
188 				   struct dtv_frontend_properties *fep)
189 {
190 	struct dtt200u_fe_state *state = fe->demodulator_priv;
191 
192 	memcpy(fep, &state->fep, sizeof(struct dtv_frontend_properties));
193 	return 0;
194 }
195 
196 static void dtt200u_fe_release(struct dvb_frontend* fe)
197 {
198 	struct dtt200u_fe_state *state = (struct dtt200u_fe_state*) fe->demodulator_priv;
199 	kfree(state);
200 }
201 
202 static const struct dvb_frontend_ops dtt200u_fe_ops;
203 
204 struct dvb_frontend* dtt200u_fe_attach(struct dvb_usb_device *d)
205 {
206 	struct dtt200u_fe_state* state = NULL;
207 
208 	/* allocate memory for the internal state */
209 	state = kzalloc(sizeof(struct dtt200u_fe_state), GFP_KERNEL);
210 	if (state == NULL)
211 		goto error;
212 
213 	deb_info("attaching frontend dtt200u\n");
214 
215 	state->d = d;
216 	mutex_init(&state->data_mutex);
217 
218 	memcpy(&state->frontend.ops,&dtt200u_fe_ops,sizeof(struct dvb_frontend_ops));
219 	state->frontend.demodulator_priv = state;
220 
221 	return &state->frontend;
222 error:
223 	return NULL;
224 }
225 
226 static const struct dvb_frontend_ops dtt200u_fe_ops = {
227 	.delsys = { SYS_DVBT },
228 	.info = {
229 		.name			= "WideView USB DVB-T",
230 		.frequency_min_hz	=  44250 * kHz,
231 		.frequency_max_hz	= 867250 * kHz,
232 		.frequency_stepsize_hz	=    250 * kHz,
233 		.caps = FE_CAN_INVERSION_AUTO |
234 				FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
235 				FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
236 				FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
237 				FE_CAN_TRANSMISSION_MODE_AUTO |
238 				FE_CAN_GUARD_INTERVAL_AUTO |
239 				FE_CAN_RECOVER |
240 				FE_CAN_HIERARCHY_AUTO,
241 	},
242 
243 	.release = dtt200u_fe_release,
244 
245 	.init = dtt200u_fe_init,
246 	.sleep = dtt200u_fe_sleep,
247 
248 	.set_frontend = dtt200u_fe_set_frontend,
249 	.get_frontend = dtt200u_fe_get_frontend,
250 	.get_tune_settings = dtt200u_fe_get_tune_settings,
251 
252 	.read_status = dtt200u_fe_read_status,
253 	.read_ber = dtt200u_fe_read_ber,
254 	.read_signal_strength = dtt200u_fe_read_signal_strength,
255 	.read_snr = dtt200u_fe_read_snr,
256 	.read_ucblocks = dtt200u_fe_read_unc_blocks,
257 };
258