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 "ddbridge-dummy-fe.h" |
15 | |
16 | struct ddbridge_dummy_fe_state { |
17 | struct dvb_frontend frontend; |
18 | }; |
19 | |
20 | static int ddbridge_dummy_fe_read_status(struct dvb_frontend *fe, |
21 | enum fe_status *status) |
22 | { |
23 | *status = FE_HAS_SIGNAL |
24 | | FE_HAS_CARRIER |
25 | | FE_HAS_VITERBI |
26 | | FE_HAS_SYNC |
27 | | FE_HAS_LOCK; |
28 | |
29 | return 0; |
30 | } |
31 | |
32 | static int ddbridge_dummy_fe_read_ber(struct dvb_frontend *fe, u32 *ber) |
33 | { |
34 | *ber = 0; |
35 | return 0; |
36 | } |
37 | |
38 | static int ddbridge_dummy_fe_read_signal_strength(struct dvb_frontend *fe, |
39 | u16 *strength) |
40 | { |
41 | *strength = 0; |
42 | return 0; |
43 | } |
44 | |
45 | static int ddbridge_dummy_fe_read_snr(struct dvb_frontend *fe, u16 *snr) |
46 | { |
47 | *snr = 0; |
48 | return 0; |
49 | } |
50 | |
51 | static int ddbridge_dummy_fe_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks) |
52 | { |
53 | *ucblocks = 0; |
54 | return 0; |
55 | } |
56 | |
57 | /* |
58 | * Should only be implemented if it actually reads something from the hardware. |
59 | * Also, it should check for the locks, in order to avoid report wrong data |
60 | * to userspace. |
61 | */ |
62 | static int ddbridge_dummy_fe_get_frontend(struct dvb_frontend *fe, |
63 | struct dtv_frontend_properties *p) |
64 | { |
65 | return 0; |
66 | } |
67 | |
68 | static int ddbridge_dummy_fe_set_frontend(struct dvb_frontend *fe) |
69 | { |
70 | if (fe->ops.tuner_ops.set_params) { |
71 | fe->ops.tuner_ops.set_params(fe); |
72 | if (fe->ops.i2c_gate_ctrl) |
73 | fe->ops.i2c_gate_ctrl(fe, 0); |
74 | } |
75 | |
76 | return 0; |
77 | } |
78 | |
79 | static int ddbridge_dummy_fe_sleep(struct dvb_frontend *fe) |
80 | { |
81 | return 0; |
82 | } |
83 | |
84 | static int ddbridge_dummy_fe_init(struct dvb_frontend *fe) |
85 | { |
86 | return 0; |
87 | } |
88 | |
89 | static void ddbridge_dummy_fe_release(struct dvb_frontend *fe) |
90 | { |
91 | struct ddbridge_dummy_fe_state *state = fe->demodulator_priv; |
92 | |
93 | kfree(objp: state); |
94 | } |
95 | |
96 | static const struct dvb_frontend_ops ddbridge_dummy_fe_qam_ops; |
97 | |
98 | struct dvb_frontend *ddbridge_dummy_fe_qam_attach(void) |
99 | { |
100 | struct ddbridge_dummy_fe_state *state = NULL; |
101 | |
102 | /* allocate memory for the internal state */ |
103 | state = kzalloc(size: sizeof(struct ddbridge_dummy_fe_state), GFP_KERNEL); |
104 | if (!state) |
105 | return NULL; |
106 | |
107 | /* create dvb_frontend */ |
108 | memcpy(&state->frontend.ops, |
109 | &ddbridge_dummy_fe_qam_ops, |
110 | sizeof(struct dvb_frontend_ops)); |
111 | |
112 | state->frontend.demodulator_priv = state; |
113 | return &state->frontend; |
114 | } |
115 | EXPORT_SYMBOL_GPL(ddbridge_dummy_fe_qam_attach); |
116 | |
117 | static const struct dvb_frontend_ops ddbridge_dummy_fe_qam_ops = { |
118 | .delsys = { SYS_DVBC_ANNEX_A }, |
119 | .info = { |
120 | .name = "ddbridge dummy DVB-C" , |
121 | .frequency_min_hz = 51 * MHz, |
122 | .frequency_max_hz = 858 * MHz, |
123 | .frequency_stepsize_hz = 62500, |
124 | /* symbol_rate_min: SACLK/64 == (XIN/2)/64 */ |
125 | .symbol_rate_min = (57840000 / 2) / 64, |
126 | .symbol_rate_max = (57840000 / 2) / 4, /* SACLK/4 */ |
127 | .caps = FE_CAN_QAM_16 | |
128 | FE_CAN_QAM_32 | |
129 | FE_CAN_QAM_64 | |
130 | FE_CAN_QAM_128 | |
131 | FE_CAN_QAM_256 | |
132 | FE_CAN_FEC_AUTO | |
133 | FE_CAN_INVERSION_AUTO |
134 | }, |
135 | |
136 | .release = ddbridge_dummy_fe_release, |
137 | |
138 | .init = ddbridge_dummy_fe_init, |
139 | .sleep = ddbridge_dummy_fe_sleep, |
140 | |
141 | .set_frontend = ddbridge_dummy_fe_set_frontend, |
142 | .get_frontend = ddbridge_dummy_fe_get_frontend, |
143 | |
144 | .read_status = ddbridge_dummy_fe_read_status, |
145 | .read_ber = ddbridge_dummy_fe_read_ber, |
146 | .read_signal_strength = ddbridge_dummy_fe_read_signal_strength, |
147 | .read_snr = ddbridge_dummy_fe_read_snr, |
148 | .read_ucblocks = ddbridge_dummy_fe_read_ucblocks, |
149 | }; |
150 | |
151 | MODULE_DESCRIPTION("ddbridge dummy Frontend" ); |
152 | MODULE_AUTHOR("Emard" ); |
153 | MODULE_LICENSE("GPL" ); |
154 | |