1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 *  Driver for Dummy Frontend
  4 *
  5 *  Written by Emard <emard@softhome.net>
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/init.h>
 10#include <linux/string.h>
 11#include <linux/slab.h>
 12
 13#include <media/dvb_frontend.h>
 14#include "dvb_dummy_fe.h"
 15
 16
 17struct dvb_dummy_fe_state {
 18	struct dvb_frontend frontend;
 19};
 20
 21
 22static int dvb_dummy_fe_read_status(struct dvb_frontend *fe,
 23				    enum fe_status *status)
 24{
 25	*status = FE_HAS_SIGNAL
 26		| FE_HAS_CARRIER
 27		| FE_HAS_VITERBI
 28		| FE_HAS_SYNC
 29		| FE_HAS_LOCK;
 30
 31	return 0;
 32}
 33
 34static int dvb_dummy_fe_read_ber(struct dvb_frontend *fe, u32 *ber)
 35{
 36	*ber = 0;
 37	return 0;
 38}
 39
 40static int dvb_dummy_fe_read_signal_strength(struct dvb_frontend *fe,
 41					     u16 *strength)
 42{
 43	*strength = 0;
 44	return 0;
 45}
 46
 47static int dvb_dummy_fe_read_snr(struct dvb_frontend *fe, u16 *snr)
 48{
 49	*snr = 0;
 50	return 0;
 51}
 52
 53static int dvb_dummy_fe_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
 54{
 55	*ucblocks = 0;
 56	return 0;
 57}
 58
 59/*
 60 * Should only be implemented if it actually reads something from the hardware.
 61 * Also, it should check for the locks, in order to avoid report wrong data
 62 * to userspace.
 63 */
 64static int dvb_dummy_fe_get_frontend(struct dvb_frontend *fe,
 65				     struct dtv_frontend_properties *p)
 66{
 67	return 0;
 68}
 69
 70static int dvb_dummy_fe_set_frontend(struct dvb_frontend *fe)
 71{
 72	if (fe->ops.tuner_ops.set_params) {
 73		fe->ops.tuner_ops.set_params(fe);
 74		if (fe->ops.i2c_gate_ctrl)
 75			fe->ops.i2c_gate_ctrl(fe, 0);
 76	}
 77
 78	return 0;
 79}
 80
 81static int dvb_dummy_fe_sleep(struct dvb_frontend *fe)
 82{
 83	return 0;
 84}
 85
 86static int dvb_dummy_fe_init(struct dvb_frontend *fe)
 87{
 88	return 0;
 89}
 90
 91static int dvb_dummy_fe_set_tone(struct dvb_frontend *fe,
 92				 enum fe_sec_tone_mode tone)
 93{
 94	return 0;
 95}
 96
 97static int dvb_dummy_fe_set_voltage(struct dvb_frontend *fe,
 98				    enum fe_sec_voltage voltage)
 99{
100	return 0;
101}
102
103static void dvb_dummy_fe_release(struct dvb_frontend *fe)
104{
105	struct dvb_dummy_fe_state *state = fe->demodulator_priv;
106
107	kfree(state);
108}
109
110static const struct dvb_frontend_ops dvb_dummy_fe_ofdm_ops;
111
112struct dvb_frontend *dvb_dummy_fe_ofdm_attach(void)
113{
114	struct dvb_dummy_fe_state *state = NULL;
115
116	/* allocate memory for the internal state */
117	state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
118	if (!state)
119		return NULL;
120
121	/* create dvb_frontend */
122	memcpy(&state->frontend.ops,
123	       &dvb_dummy_fe_ofdm_ops,
124	       sizeof(struct dvb_frontend_ops));
125
126	state->frontend.demodulator_priv = state;
127	return &state->frontend;
128}
129EXPORT_SYMBOL(dvb_dummy_fe_ofdm_attach);
130
131static const struct dvb_frontend_ops dvb_dummy_fe_qpsk_ops;
132
133struct dvb_frontend *dvb_dummy_fe_qpsk_attach(void)
134{
135	struct dvb_dummy_fe_state *state = NULL;
136
137	/* allocate memory for the internal state */
138	state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
139	if (!state)
140		return NULL;
141
142	/* create dvb_frontend */
143	memcpy(&state->frontend.ops,
144	       &dvb_dummy_fe_qpsk_ops,
145	       sizeof(struct dvb_frontend_ops));
146
147	state->frontend.demodulator_priv = state;
148	return &state->frontend;
149}
150EXPORT_SYMBOL(dvb_dummy_fe_qpsk_attach);
151
152static const struct dvb_frontend_ops dvb_dummy_fe_qam_ops;
153
154struct dvb_frontend *dvb_dummy_fe_qam_attach(void)
155{
156	struct dvb_dummy_fe_state *state = NULL;
157
158	/* allocate memory for the internal state */
159	state = kzalloc(sizeof(struct dvb_dummy_fe_state), GFP_KERNEL);
160	if (!state)
161		return NULL;
162
163	/* create dvb_frontend */
164	memcpy(&state->frontend.ops,
165	       &dvb_dummy_fe_qam_ops,
166	       sizeof(struct dvb_frontend_ops));
167
168	state->frontend.demodulator_priv = state;
169	return &state->frontend;
170}
171EXPORT_SYMBOL(dvb_dummy_fe_qam_attach);
172
173static const struct dvb_frontend_ops dvb_dummy_fe_ofdm_ops = {
174	.delsys = { SYS_DVBT },
175	.info = {
176		.name			= "Dummy DVB-T",
177		.frequency_min_hz	= 0,
178		.frequency_max_hz	= 863250 * kHz,
179		.frequency_stepsize_hz	= 62500,
180		.caps = FE_CAN_FEC_1_2 |
181			FE_CAN_FEC_2_3 |
182			FE_CAN_FEC_3_4 |
183			FE_CAN_FEC_4_5 |
184			FE_CAN_FEC_5_6 |
185			FE_CAN_FEC_6_7 |
186			FE_CAN_FEC_7_8 |
187			FE_CAN_FEC_8_9 |
188			FE_CAN_FEC_AUTO |
189			FE_CAN_QAM_16 |
190			FE_CAN_QAM_64 |
191			FE_CAN_QAM_AUTO |
192			FE_CAN_TRANSMISSION_MODE_AUTO |
193			FE_CAN_GUARD_INTERVAL_AUTO |
194			FE_CAN_HIERARCHY_AUTO,
195	},
196
197	.release = dvb_dummy_fe_release,
198
199	.init = dvb_dummy_fe_init,
200	.sleep = dvb_dummy_fe_sleep,
201
202	.set_frontend = dvb_dummy_fe_set_frontend,
203	.get_frontend = dvb_dummy_fe_get_frontend,
204
205	.read_status = dvb_dummy_fe_read_status,
206	.read_ber = dvb_dummy_fe_read_ber,
207	.read_signal_strength = dvb_dummy_fe_read_signal_strength,
208	.read_snr = dvb_dummy_fe_read_snr,
209	.read_ucblocks = dvb_dummy_fe_read_ucblocks,
210};
211
212static const struct dvb_frontend_ops dvb_dummy_fe_qam_ops = {
213	.delsys = { SYS_DVBC_ANNEX_A },
214	.info = {
215		.name			= "Dummy DVB-C",
216		.frequency_min_hz	=  51 * MHz,
217		.frequency_max_hz	= 858 * MHz,
218		.frequency_stepsize_hz	= 62500,
219		/* symbol_rate_min: SACLK/64 == (XIN/2)/64 */
220		.symbol_rate_min	= (57840000 / 2) / 64,
221		.symbol_rate_max	= (57840000 / 2) / 4,   /* SACLK/4 */
222		.caps = FE_CAN_QAM_16 |
223			FE_CAN_QAM_32 |
224			FE_CAN_QAM_64 |
225			FE_CAN_QAM_128 |
226			FE_CAN_QAM_256 |
227			FE_CAN_FEC_AUTO |
228			FE_CAN_INVERSION_AUTO
229	},
230
231	.release = dvb_dummy_fe_release,
232
233	.init = dvb_dummy_fe_init,
234	.sleep = dvb_dummy_fe_sleep,
235
236	.set_frontend = dvb_dummy_fe_set_frontend,
237	.get_frontend = dvb_dummy_fe_get_frontend,
238
239	.read_status = dvb_dummy_fe_read_status,
240	.read_ber = dvb_dummy_fe_read_ber,
241	.read_signal_strength = dvb_dummy_fe_read_signal_strength,
242	.read_snr = dvb_dummy_fe_read_snr,
243	.read_ucblocks = dvb_dummy_fe_read_ucblocks,
244};
245
246static const struct dvb_frontend_ops dvb_dummy_fe_qpsk_ops = {
247	.delsys = { SYS_DVBS },
248	.info = {
249		.name			= "Dummy DVB-S",
250		.frequency_min_hz	=  950 * MHz,
251		.frequency_max_hz	= 2150 * MHz,
252		.frequency_stepsize_hz	= 250 * kHz,
253		.frequency_tolerance_hz	= 29500 * kHz,
254		.symbol_rate_min	= 1000000,
255		.symbol_rate_max	= 45000000,
256		.caps = FE_CAN_INVERSION_AUTO |
257			FE_CAN_FEC_1_2 |
258			FE_CAN_FEC_2_3 |
259			FE_CAN_FEC_3_4 |
260			FE_CAN_FEC_5_6 |
261			FE_CAN_FEC_7_8 |
262			FE_CAN_FEC_AUTO |
263			FE_CAN_QPSK
264	},
265
266	.release = dvb_dummy_fe_release,
267
268	.init = dvb_dummy_fe_init,
269	.sleep = dvb_dummy_fe_sleep,
270
271	.set_frontend = dvb_dummy_fe_set_frontend,
272	.get_frontend = dvb_dummy_fe_get_frontend,
273
274	.read_status = dvb_dummy_fe_read_status,
275	.read_ber = dvb_dummy_fe_read_ber,
276	.read_signal_strength = dvb_dummy_fe_read_signal_strength,
277	.read_snr = dvb_dummy_fe_read_snr,
278	.read_ucblocks = dvb_dummy_fe_read_ucblocks,
279
280	.set_voltage = dvb_dummy_fe_set_voltage,
281	.set_tone = dvb_dummy_fe_set_tone,
282};
283
284MODULE_DESCRIPTION("DVB DUMMY Frontend");
285MODULE_AUTHOR("Emard");
286MODULE_LICENSE("GPL");