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[24.9.64.241]) by smtp.gmail.com with ESMTPSA id j13sm2261190oib.7.2020.05.28.16.39.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 28 May 2020 16:39:48 -0700 (PDT) Subject: Re: [RFC, WIP, v6 03/10] media: vidtv: implement a demodulator driver To: "Daniel W. S. Almeida" , mchehab+huawei@kernel.org, sean@mess.org, kstewart@linuxfoundation.org, allison@lohutok.net, tglx@linutronix.de Cc: linux-media@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org, Shuah Khan References: <20200520070334.1778751-1-dwlsalmeida@gmail.com> <20200520070334.1778751-4-dwlsalmeida@gmail.com> From: Shuah Khan Message-ID: <344e4671-fef1-c809-e746-d7716361182c@linuxfoundation.org> Date: Thu, 28 May 2020 17:39:47 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200520070334.1778751-4-dwlsalmeida@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/20/20 1:03 AM, Daniel W. S. Almeida wrote: > From: "Daniel W. S. Almeida" > > Implement a I2C demodulator driver, simulating support for DVB-T, DVB-C > and DVB-S. > > This demodulator will periodically check the signal quality against a table > and drop the TS lock if it drops below a threshold value, regaining it in > the event that the signal improves. > > Signed-off-by: Daniel W. S. Almeida > --- > drivers/media/test-drivers/vidtv/Makefile | 3 +- > .../media/test-drivers/vidtv/vidtv_demod.c | 444 ++++++++++++++++++ > .../media/test-drivers/vidtv/vidtv_demod.h | 41 ++ > 3 files changed, 487 insertions(+), 1 deletion(-) > create mode 100644 drivers/media/test-drivers/vidtv/vidtv_demod.c > create mode 100644 drivers/media/test-drivers/vidtv/vidtv_demod.h > > diff --git a/drivers/media/test-drivers/vidtv/Makefile b/drivers/media/test-drivers/vidtv/Makefile > index 58e022c094e5e..21e50c11c94d0 100644 > --- a/drivers/media/test-drivers/vidtv/Makefile > +++ b/drivers/media/test-drivers/vidtv/Makefile > @@ -1,5 +1,6 @@ > # SPDX-License-Identifier: GPL-2.0 > > dvb-vidtv-tuner-objs := vidtv_tuner.o > +dvb-vidtv-demod-objs := vidtv_demod.o > > -obj-$(CONFIG_DVB_VIDTV) += dvb-vidtv-tuner.o > +obj-$(CONFIG_DVB_VIDTV) += dvb-vidtv-tuner.o dvb-vidtv-demod.o > 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 0000000000000..15912e063cf5a > --- /dev/null > +++ b/drivers/media/test-drivers/vidtv/vidtv_demod.c > @@ -0,0 +1,444 @@ > +// 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. > + * > + * Written by Daniel W. S. Almeida > + * Based on the example driver written by Emard > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#include "vidtv_demod.h" > + > +// FIXME: just added a random value here > +#define POLL_THRD_TIME 10 /* 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) Looks very odd: Move vidtv_match_cnr_s up and: static const struct vidtv_demod_cnr_to_qual_s vidtv_match_cnr_s(struct dvb_frontend *fe) is better. > +{ > + struct dtv_frontend_properties *c; > + const struct vidtv_demod_cnr_to_qual_s *cnr2qual = NULL; > + u32 array_size = 0; This looks really odd. Don't align them. Align them if it makes sense. It doesn't here. > + u32 i; > + > + c = &fe->dtv_property_cache; > + > + switch (c->delivery_system) { Indentation > + 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: > + pr_warn_ratelimited("%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_demod_poll_snr_handler(struct work_struct *work) > +{ > + /* > + * periodically check the signal quality and eventually > + * lose the TS lock if it dips too low > + */ > + struct vidtv_demod_state *state; > + const struct vidtv_demod_cnr_to_qual_s *cnr2qual = NULL; > + struct vidtv_demod_config *config; > + u16 snr = 0; > + > + state = container_of(work, struct vidtv_demod_state, poll_snr.work); > + config = &state->config; > + > + if (!state->frontend.ops.tuner_ops.get_rf_strength) > + return; > + > + state->frontend.ops.tuner_ops.get_rf_strength(&state->frontend, &snr); > + > + cnr2qual = vidtv_match_cnr_s(&state->frontend); > + if (!cnr2qual) > + return; > + > + 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; > + } > + > + schedule_delayed_work(&state->poll_snr, > + msecs_to_jiffies(POLL_THRD_TIME)); > +} > + > +static int vidtv_demod_read_status(struct dvb_frontend *fe, > + enum fe_status *status) > +{ > + struct vidtv_demod_state *state = fe->demodulator_priv; > + > + *status = state->status; > + > + return 0; > +} > + > +static int vidtv_demod_read_ber(struct dvb_frontend *fe, u32 *ber) > +{ > + *ber = 0; > + return 0; > +} > + > +static int vidtv_demod_read_signal_strength(struct dvb_frontend *fe, > + u16 *strength) > +{ > + *strength = 0; > + return 0; > +} > + > +static int vidtv_demod_read_snr(struct dvb_frontend *fe, u16 *snr) > +{ > + *snr = 0; > + return 0; > +} > + > +static int vidtv_demod_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks) > +{ > + *ucblocks = 0; > + 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; > + const struct vidtv_demod_cnr_to_qual_s *cnr2qual = NULL; > + u32 tuner_status = 0; > + > + if (fe->ops.tuner_ops.set_params) { > + fe->ops.tuner_ops.set_params(fe); > + > + /* store the CNR returned by the tuner */ > + fe->ops.tuner_ops.get_rf_strength(fe, &state->tuner_cnr); > + > + 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; > + cnr2qual = vidtv_match_cnr_s(fe); > + > + /* signal isn't good: might lose the lock eventually */ > + if (tuner_status == TUNER_STATUS_LOCKED && > + state->tuner_cnr < cnr2qual->cnr_good) { > + schedule_delayed_work(&state->poll_snr, > + msecs_to_jiffies(POLL_THRD_TIME)); > + > + state->poll_snr_thread_running = true; > + } > + > + if (fe->ops.i2c_gate_ctrl) > + fe->ops.i2c_gate_ctrl(fe, 0); > + } > + > + return 0; > +} > + > +static int vidtv_demod_sleep(struct dvb_frontend *fe) > +{ > + struct vidtv_demod_state *state = fe->demodulator_priv; > + > + if (state->poll_snr_thread_running) { > + cancel_delayed_work_sync(&state->poll_snr); > + state->poll_snr_thread_running = false; > + state->poll_snr_thread_restart = true; > + } > + return 0; > +} > + > +static int vidtv_demod_init(struct dvb_frontend *fe) > +{ > + struct vidtv_demod_state *state = fe->demodulator_priv; > + u32 tuner_status = 0; > + > + if (state->cold_start) > + INIT_DELAYED_WORK(&state->poll_snr, > + &vidtv_demod_poll_snr_handler); > + > + /* > + * At resume, start the snr poll thread only if it was suspended with > + * the thread running. Extra care should be taken here, as some tuner > + * status change might happen at resume time (for example, due to an > + * ioctl syscall to set_frontend, or due to a release syscall). > + */ > + fe->ops.tuner_ops.get_status(fe, &tuner_status); > + > + if (tuner_status == TUNER_STATUS_LOCKED && > + state->poll_snr_thread_restart) { > + schedule_delayed_work(&state->poll_snr, > + msecs_to_jiffies(POLL_THRD_TIME)); > + > + state->poll_snr_thread_restart = false; > + } > + > + state->cold_start = false; > + 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; > +} > + > +static void vidtv_demod_release(struct dvb_frontend *fe) > +{ > + struct vidtv_demod_state *state = fe->demodulator_priv; > + > + if (state->poll_snr_thread_running) > + cancel_delayed_work_sync(&state->poll_snr); > + > + 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_FEC_AUTO | Here is the first one. > + 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 | Duplicate entry? Cut and paste error perhaps. > + FE_CAN_INVERSION_AUTO | > + FE_CAN_TRANSMISSION_MODE_AUTO | > + FE_CAN_GUARD_INTERVAL_AUTO | > + FE_CAN_HIERARCHY_AUTO, > + }, > + > + .release = vidtv_demod_release, > + > + .init = vidtv_demod_init, > + .sleep = vidtv_demod_sleep, > + > + .set_frontend = vidtv_demod_set_frontend, > + .get_frontend = vidtv_demod_get_frontend, > + > + .read_status = vidtv_demod_read_status, > + .read_ber = vidtv_demod_read_ber, > + .read_signal_strength = vidtv_demod_read_signal_strength, > + .read_snr = vidtv_demod_read_snr, > + .read_ucblocks = vidtv_demod_read_ucblocks, > + > + /* For DVB-S/S2 */ > + .set_voltage = vidtv_demod_set_voltage, > + .set_tone = vidtv_demod_set_tone, > +}; > + > +static const struct i2c_device_id vidtv_demod_i2c_id_table[] = { > + {"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_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)); > + > + state->frontend.demodulator_priv = state; > + i2c_set_clientdata(client, state); > + > + return 0; > +} > + > +static int vidtv_demod_i2c_remove(struct i2c_client *client) > +{ > + struct vidtv_demod_state *state = i2c_get_clientdata(client); > + > + memset(&state->frontend.ops, 0, sizeof(struct dvb_frontend_ops)); > + state->frontend.demodulator_priv = NULL; > + kfree(state); > + > + return 0; > +} > + > +static struct i2c_driver vidtv_demod_i2c_driver = { > + .driver = { > + .name = "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"); > diff --git a/drivers/media/test-drivers/vidtv/vidtv_demod.h b/drivers/media/test-drivers/vidtv/vidtv_demod.h > new file mode 100644 > index 0000000000000..b14957d9d4ea0 > --- /dev/null > +++ b/drivers/media/test-drivers/vidtv/vidtv_demod.h > @@ -0,0 +1,41 @@ > +/* SPDX-License-Identifier: GPL-2.0-or-later */ > +/* > + * The Virtual DTV 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. > + * > + * Written by Daniel W. S. Almeida Change it to Copyright. Same comment on all files in this series. > + * Based on the example driver written by Emard > + */ > + > +#ifndef VIDTV_DEMOD_H > +#define VIDTV_DEMOD_H > + > +#include > +#include > + > +struct vidtv_demod_cnr_to_qual_s { > + /* attempt to use the same values as libdvbv5 */ > + u32 modulation; > + u32 fec; > + u32 cnr_ok, cnr_good; Move cnr_good to a separate line. Describe these variables. Whatare they for and what they do. > +}; > + > +struct vidtv_demod_config { > + /* probability of losing the lock due to low snr */ > + u8 drop_tslock_prob_on_low_snr; > + /* probability of recovering when the signal improves */ > + u8 recover_tslock_prob_on_good_snr; > +}; > + > +struct vidtv_demod_state { > + struct dvb_frontend frontend; > + struct vidtv_demod_config config; > + struct delayed_work poll_snr; > + enum fe_status status; > + u16 tuner_cnr; > + bool cold_start; > + bool poll_snr_thread_running; > + bool poll_snr_thread_restart; > +}; > +#endif // VIDTV_DEMOD_H > thanks, -- Shuah