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path: root/drivers/media/test-drivers/vidtv/vidtv_demod.c
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Diffstat (limited to 'drivers/media/test-drivers/vidtv/vidtv_demod.c')
-rw-r--r--drivers/media/test-drivers/vidtv/vidtv_demod.c464
1 files changed, 464 insertions, 0 deletions
diff --git a/drivers/media/test-drivers/vidtv/vidtv_demod.c b/drivers/media/test-drivers/vidtv/vidtv_demod.c
new file mode 100644
index 000000000000..eba7fe1a1b48
--- /dev/null
+++ b/drivers/media/test-drivers/vidtv/vidtv_demod.c
@@ -0,0 +1,464 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * The Virtual DVB test driver serves as a reference DVB driver and helps
+ * validate the existing APIs in the media subsystem. It can also aid
+ * developers working on userspace applications.
+ *
+ * Copyright (C) 2020 Daniel W. S. Almeida
+ * Based on the example driver written by Emard <emard@softhome.net>
+ */
+
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+#include <linux/random.h>
+#include <linux/ratelimit.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/workqueue.h>
+#include <media/dvb_frontend.h>
+
+#include "vidtv_demod.h"
+
+#define POLL_THRD_TIME 2000 /* ms */
+
+static const struct vidtv_demod_cnr_to_qual_s vidtv_demod_c_cnr_2_qual[] = {
+ /* from libdvbv5 source code, in milli db */
+ { QAM_256, FEC_NONE, 34000, 38000},
+ { QAM_64, FEC_NONE, 30000, 34000},
+};
+
+static const struct vidtv_demod_cnr_to_qual_s vidtv_demod_s_cnr_2_qual[] = {
+ /* from libdvbv5 source code, in milli db */
+ { QPSK, FEC_1_2, 7000, 10000},
+ { QPSK, FEC_2_3, 9000, 12000},
+ { QPSK, FEC_3_4, 10000, 13000},
+ { QPSK, FEC_5_6, 11000, 14000},
+ { QPSK, FEC_7_8, 12000, 15000},
+};
+
+static const struct vidtv_demod_cnr_to_qual_s vidtv_demod_s2_cnr_2_qual[] = {
+ /* from libdvbv5 source code, in milli db */
+ { QPSK, FEC_1_2, 9000, 12000},
+ { QPSK, FEC_2_3, 11000, 14000},
+ { QPSK, FEC_3_4, 12000, 15000},
+ { QPSK, FEC_5_6, 12000, 15000},
+ { QPSK, FEC_8_9, 13000, 16000},
+ { QPSK, FEC_9_10, 13500, 16500},
+ { PSK_8, FEC_2_3, 14500, 17500},
+ { PSK_8, FEC_3_4, 16000, 19000},
+ { PSK_8, FEC_5_6, 17500, 20500},
+ { PSK_8, FEC_8_9, 19000, 22000},
+};
+
+static const struct vidtv_demod_cnr_to_qual_s vidtv_demod_t_cnr_2_qual[] = {
+ /* from libdvbv5 source code, in milli db*/
+ { QPSK, FEC_1_2, 4100, 5900},
+ { QPSK, FEC_2_3, 6100, 9600},
+ { QPSK, FEC_3_4, 7200, 12400},
+ { QPSK, FEC_5_6, 8500, 15600},
+ { QPSK, FEC_7_8, 9200, 17500},
+ { QAM_16, FEC_1_2, 9800, 11800},
+ { QAM_16, FEC_2_3, 12100, 15300},
+ { QAM_16, FEC_3_4, 13400, 18100},
+ { QAM_16, FEC_5_6, 14800, 21300},
+ { QAM_16, FEC_7_8, 15700, 23600},
+ { QAM_64, FEC_1_2, 14000, 16000},
+ { QAM_64, FEC_2_3, 19900, 25400},
+ { QAM_64, FEC_3_4, 24900, 27900},
+ { QAM_64, FEC_5_6, 21300, 23300},
+ { QAM_64, FEC_7_8, 22000, 24000},
+};
+
+static const struct vidtv_demod_cnr_to_qual_s *vidtv_match_cnr_s(struct dvb_frontend *fe)
+{
+ const struct vidtv_demod_cnr_to_qual_s *cnr2qual = NULL;
+ struct device *dev = fe->dvb->device;
+ struct dtv_frontend_properties *c;
+ u32 array_size = 0;
+ u32 i;
+
+ c = &fe->dtv_property_cache;
+
+ switch (c->delivery_system) {
+ case SYS_DVBT:
+ case SYS_DVBT2:
+ cnr2qual = vidtv_demod_t_cnr_2_qual;
+ array_size = ARRAY_SIZE(vidtv_demod_t_cnr_2_qual);
+ break;
+
+ case SYS_DVBS:
+ cnr2qual = vidtv_demod_s_cnr_2_qual;
+ array_size = ARRAY_SIZE(vidtv_demod_s_cnr_2_qual);
+ break;
+
+ case SYS_DVBS2:
+ cnr2qual = vidtv_demod_s2_cnr_2_qual;
+ array_size = ARRAY_SIZE(vidtv_demod_s2_cnr_2_qual);
+ break;
+
+ case SYS_DVBC_ANNEX_A:
+ cnr2qual = vidtv_demod_c_cnr_2_qual;
+ array_size = ARRAY_SIZE(vidtv_demod_c_cnr_2_qual);
+ break;
+
+ default:
+ dev_warn_ratelimited(dev,
+ "%s: unsupported delivery system: %u\n",
+ __func__,
+ c->delivery_system);
+ break;
+ }
+
+ for (i = 0; i < array_size; i++)
+ if (cnr2qual[i].modulation == c->modulation &&
+ cnr2qual[i].fec == c->fec_inner)
+ return &cnr2qual[i];
+
+ return NULL; /* not found */
+}
+
+static void vidtv_clean_stats(struct dvb_frontend *fe)
+{
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+
+ /* Fill the length of each status counter */
+
+ /* Signal is always available */
+ c->strength.len = 1;
+ c->strength.stat[0].scale = FE_SCALE_DECIBEL;
+ c->strength.stat[0].svalue = 0;
+
+ /* Usually available only after Viterbi lock */
+ c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ c->cnr.stat[0].svalue = 0;
+ c->cnr.len = 1;
+
+ /* Those depends on full lock */
+ c->pre_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ c->pre_bit_error.stat[0].uvalue = 0;
+ c->pre_bit_error.len = 1;
+ c->pre_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ c->pre_bit_count.stat[0].uvalue = 0;
+ c->pre_bit_count.len = 1;
+ c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ c->post_bit_error.stat[0].uvalue = 0;
+ c->post_bit_error.len = 1;
+ c->post_bit_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ c->post_bit_count.stat[0].uvalue = 0;
+ c->post_bit_count.len = 1;
+ c->block_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ c->block_error.stat[0].uvalue = 0;
+ c->block_error.len = 1;
+ c->block_count.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
+ c->block_count.stat[0].uvalue = 0;
+ c->block_count.len = 1;
+}
+
+static void vidtv_demod_update_stats(struct dvb_frontend *fe)
+{
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ struct vidtv_demod_state *state = fe->demodulator_priv;
+ u32 scale;
+
+ if (state->status & FE_HAS_LOCK) {
+ scale = FE_SCALE_COUNTER;
+ c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
+ } else {
+ scale = FE_SCALE_NOT_AVAILABLE;
+ c->cnr.stat[0].scale = scale;
+ }
+
+ c->pre_bit_error.stat[0].scale = scale;
+ c->pre_bit_count.stat[0].scale = scale;
+ c->post_bit_error.stat[0].scale = scale;
+ c->post_bit_count.stat[0].scale = scale;
+ c->block_error.stat[0].scale = scale;
+ c->block_count.stat[0].scale = scale;
+
+ /*
+ * Add a 0.5% of randomness at the signal strength and CNR,
+ * and make them different, as we want to have something closer
+ * to a real case scenario.
+ *
+ * Also, usually, signal strength is a negative number in dBm.
+ */
+ c->strength.stat[0].svalue = state->tuner_cnr;
+ c->strength.stat[0].svalue -= prandom_u32_max(state->tuner_cnr / 50);
+ c->strength.stat[0].svalue -= 68000; /* Adjust to a better range */
+
+ c->cnr.stat[0].svalue = state->tuner_cnr;
+ c->cnr.stat[0].svalue -= prandom_u32_max(state->tuner_cnr / 50);
+
+}
+
+static int vidtv_demod_read_status(struct dvb_frontend *fe,
+ enum fe_status *status)
+{
+ struct vidtv_demod_state *state = fe->demodulator_priv;
+ const struct vidtv_demod_cnr_to_qual_s *cnr2qual = NULL;
+ struct vidtv_demod_config *config = &state->config;
+ u16 snr = 0;
+
+ /* Simulate random lost of signal due to a bad-tuned channel */
+ cnr2qual = vidtv_match_cnr_s(&state->frontend);
+
+ if (cnr2qual && state->tuner_cnr < cnr2qual->cnr_good &&
+ state->frontend.ops.tuner_ops.get_rf_strength) {
+ state->frontend.ops.tuner_ops.get_rf_strength(&state->frontend,
+ &snr);
+
+ if (snr < cnr2qual->cnr_ok) {
+ /* eventually lose the TS lock */
+ if (prandom_u32_max(100) < config->drop_tslock_prob_on_low_snr)
+ state->status = 0;
+ } else {
+ /* recover if the signal improves */
+ if (prandom_u32_max(100) <
+ config->recover_tslock_prob_on_good_snr)
+ state->status = FE_HAS_SIGNAL |
+ FE_HAS_CARRIER |
+ FE_HAS_VITERBI |
+ FE_HAS_SYNC |
+ FE_HAS_LOCK;
+ }
+ }
+
+ vidtv_demod_update_stats(&state->frontend);
+
+ *status = state->status;
+
+ return 0;
+}
+
+static int vidtv_demod_read_signal_strength(struct dvb_frontend *fe,
+ u16 *strength)
+{
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+
+ *strength = c->strength.stat[0].uvalue;
+
+ return 0;
+}
+
+/*
+ * NOTE:
+ * This is implemented here just to be used as an example for real
+ * demod drivers.
+ *
+ * Should only be implemented if it actually reads something from the hardware.
+ * Also, it should check for the locks, in order to avoid report wrong data
+ * to userspace.
+ */
+static int vidtv_demod_get_frontend(struct dvb_frontend *fe,
+ struct dtv_frontend_properties *p)
+{
+ return 0;
+}
+
+static int vidtv_demod_set_frontend(struct dvb_frontend *fe)
+{
+ struct vidtv_demod_state *state = fe->demodulator_priv;
+ u32 tuner_status = 0;
+ int ret;
+
+ if (!fe->ops.tuner_ops.set_params)
+ return 0;
+
+ fe->ops.tuner_ops.set_params(fe);
+
+ /* store the CNR returned by the tuner */
+ ret = fe->ops.tuner_ops.get_rf_strength(fe, &state->tuner_cnr);
+ if (ret < 0)
+ return ret;
+
+ fe->ops.tuner_ops.get_status(fe, &tuner_status);
+ state->status = (state->tuner_cnr > 0) ? FE_HAS_SIGNAL |
+ FE_HAS_CARRIER |
+ FE_HAS_VITERBI |
+ FE_HAS_SYNC |
+ FE_HAS_LOCK :
+ 0;
+
+ vidtv_demod_update_stats(fe);
+
+ if (fe->ops.i2c_gate_ctrl)
+ fe->ops.i2c_gate_ctrl(fe, 0);
+
+ return 0;
+}
+
+/*
+ * NOTE:
+ * This is implemented here just to be used as an example for real
+ * demod drivers.
+ *
+ * Should only be implemented if the demod has support for DVB-S or DVB-S2
+ */
+static int vidtv_demod_set_tone(struct dvb_frontend *fe,
+ enum fe_sec_tone_mode tone)
+{
+ return 0;
+}
+
+/*
+ * NOTE:
+ * This is implemented here just to be used as an example for real
+ * demod drivers.
+ *
+ * Should only be implemented if the demod has support for DVB-S or DVB-S2
+ */
+static int vidtv_demod_set_voltage(struct dvb_frontend *fe,
+ enum fe_sec_voltage voltage)
+{
+ return 0;
+}
+
+/*
+ * NOTE:
+ * This is implemented here just to be used as an example for real
+ * demod drivers.
+ *
+ * Should only be implemented if the demod has support for DVB-S or DVB-S2
+ */
+static int vidtv_send_diseqc_msg(struct dvb_frontend *fe,
+ struct dvb_diseqc_master_cmd *cmd)
+{
+ return 0;
+}
+
+/*
+ * NOTE:
+ * This is implemented here just to be used as an example for real
+ * demod drivers.
+ *
+ * Should only be implemented if the demod has support for DVB-S or DVB-S2
+ */
+static int vidtv_diseqc_send_burst(struct dvb_frontend *fe,
+ enum fe_sec_mini_cmd burst)
+{
+ return 0;
+}
+
+static void vidtv_demod_release(struct dvb_frontend *fe)
+{
+ struct vidtv_demod_state *state = fe->demodulator_priv;
+
+ kfree(state);
+}
+
+static const struct dvb_frontend_ops vidtv_demod_ops = {
+ .delsys = {
+ SYS_DVBT,
+ SYS_DVBT2,
+ SYS_DVBC_ANNEX_A,
+ SYS_DVBS,
+ SYS_DVBS2,
+ },
+
+ .info = {
+ .name = "Dummy demod for DVB-T/T2/C/S/S2",
+ .frequency_min_hz = 51 * MHz,
+ .frequency_max_hz = 2150 * MHz,
+ .frequency_stepsize_hz = 62500,
+ .frequency_tolerance_hz = 29500 * kHz,
+ .symbol_rate_min = 1000000,
+ .symbol_rate_max = 45000000,
+
+ .caps = FE_CAN_FEC_1_2 |
+ FE_CAN_FEC_2_3 |
+ FE_CAN_FEC_3_4 |
+ FE_CAN_FEC_4_5 |
+ FE_CAN_FEC_5_6 |
+ FE_CAN_FEC_6_7 |
+ FE_CAN_FEC_7_8 |
+ FE_CAN_FEC_8_9 |
+ FE_CAN_QAM_16 |
+ FE_CAN_QAM_64 |
+ FE_CAN_QAM_32 |
+ FE_CAN_QAM_128 |
+ FE_CAN_QAM_256 |
+ FE_CAN_QAM_AUTO |
+ FE_CAN_QPSK |
+ FE_CAN_FEC_AUTO |
+ FE_CAN_INVERSION_AUTO |
+ FE_CAN_TRANSMISSION_MODE_AUTO |
+ FE_CAN_GUARD_INTERVAL_AUTO |
+ FE_CAN_HIERARCHY_AUTO,
+ },
+
+ .release = vidtv_demod_release,
+
+ .set_frontend = vidtv_demod_set_frontend,
+ .get_frontend = vidtv_demod_get_frontend,
+
+ .read_status = vidtv_demod_read_status,
+ .read_signal_strength = vidtv_demod_read_signal_strength,
+
+ /* For DVB-S/S2 */
+ .set_voltage = vidtv_demod_set_voltage,
+ .set_tone = vidtv_demod_set_tone,
+ .diseqc_send_master_cmd = vidtv_send_diseqc_msg,
+ .diseqc_send_burst = vidtv_diseqc_send_burst,
+
+};
+
+static const struct i2c_device_id vidtv_demod_i2c_id_table[] = {
+ {"dvb_vidtv_demod", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, vidtv_demod_i2c_id_table);
+
+static int vidtv_demod_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct vidtv_tuner_config *config = client->dev.platform_data;
+ struct vidtv_demod_state *state;
+
+ /* allocate memory for the internal state */
+ state = kzalloc(sizeof(*state), GFP_KERNEL);
+ if (!state)
+ return -ENOMEM;
+
+ /* create dvb_frontend */
+ memcpy(&state->frontend.ops,
+ &vidtv_demod_ops,
+ sizeof(struct dvb_frontend_ops));
+
+ memcpy(&state->config, config, sizeof(state->config));
+
+ state->frontend.demodulator_priv = state;
+ i2c_set_clientdata(client, state);
+
+ vidtv_clean_stats(&state->frontend);
+
+ return 0;
+}
+
+static int vidtv_demod_i2c_remove(struct i2c_client *client)
+{
+ struct vidtv_demod_state *state = i2c_get_clientdata(client);
+
+ kfree(state);
+
+ return 0;
+}
+
+static struct i2c_driver vidtv_demod_i2c_driver = {
+ .driver = {
+ .name = "dvb_vidtv_demod",
+ .suppress_bind_attrs = true,
+ },
+ .probe = vidtv_demod_i2c_probe,
+ .remove = vidtv_demod_i2c_remove,
+ .id_table = vidtv_demod_i2c_id_table,
+};
+
+module_i2c_driver(vidtv_demod_i2c_driver);
+
+MODULE_DESCRIPTION("Virtual DVB Demodulator Driver");
+MODULE_AUTHOR("Daniel W. S. Almeida");
+MODULE_LICENSE("GPL");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.