From patchwork Sat May 2 03:22:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Almeida X-Patchwork-Id: 209983 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0F033C47254 for ; Sat, 2 May 2020 03:22:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CA7682184D for ; Sat, 2 May 2020 03:22:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="McUTt5gL" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726951AbgEBDWh (ORCPT ); Fri, 1 May 2020 23:22:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39892 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726439AbgEBDWg (ORCPT ); Fri, 1 May 2020 23:22:36 -0400 Received: from mail-qk1-x744.google.com (mail-qk1-x744.google.com [IPv6:2607:f8b0:4864:20::744]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A8076C061A0C; Fri, 1 May 2020 20:22:36 -0700 (PDT) Received: by mail-qk1-x744.google.com with SMTP id q7so11245119qkf.3; Fri, 01 May 2020 20:22:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=vOfGhTh2Jo/NyvBbJBpC6oj9kdoBU+4VAUZ3CEi4qes=; b=McUTt5gLkXayOgiy5NBbinWpsfM6qbr0a2WqnbFVMTs6HC8DyDbzDRFty0Os3voy/a 0vo5JKuYUD88ET2JEpnb/nRPNr1ZK0mqeYHXjzjEGD1rHZ2J51bSKGzbEPAIpoDdii1c wx4sGEJLJvHmvPwIVkfy4gD7NXCx1GdlebdUX/4WM4nbBrhrEWtE40N4s1jxgCx8z4ps 13I4llZPcnJIcTfPVZMM5k+fbhgDlaaFDGDkaa4uABQeKAHtVYzg4Mzwlvycwk1+e42q L23+JsG+XrIHFKcRboNqOdRWGtwnf0v6VlznbBT4eSZty+LG5Siyiv9/iuZBpuCN2jOM Y4Kg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=vOfGhTh2Jo/NyvBbJBpC6oj9kdoBU+4VAUZ3CEi4qes=; b=LdwYAszx+RjTqUAKEcX3T3uq5+5ruZesLhEu4w6wtYhazZ0qNkXYaUfCsiAvnyw8un ZR6TbzFg/H5uNcYKQDb5PF/EEtiMJzQKhvCsbRi0F6QCxBGmp5U0glT1Z3OAq9BqtaPv d2WG6Ak65wo47OfVrdYkj9I/03T6nMtHTzi4nuVtkANjwQakGJVeLm31a2Lr+qqDP6y+ HiXt4qH6vmoSFmLew0cht61JODJ4M8ANC4ovvmslh28nwX2oLJACuhMWY82tByMYzHqV 3EU8XhnaLgLhiLbGtYnUlVibSPAFGSS9etzEW/uGOOu3b4gWQOvomKjrPrL9N9FyyRmV 2YPw== X-Gm-Message-State: AGi0PubZcc5enmC1BLI27tioAkkCFvL5aRcUS897DjTcQ/QhMD2vDUFc 8Hff1GGfjnQGVWOl4NPWqPY= X-Google-Smtp-Source: APiQypJiotM5yN7QEX9KKPF6Q0K91HaEi84ECXmMB7K6p/rS8CQuozEN8guj7EmLXhdVJtw7/5rfAg== X-Received: by 2002:ae9:e214:: with SMTP id c20mr6717000qkc.107.1588389755774; Fri, 01 May 2020 20:22:35 -0700 (PDT) Received: from localhost.localdomain ([2804:18:602b:723a:1b2a:57a1:a611:34ed]) by smtp.gmail.com with ESMTPSA id c41sm4410399qta.96.2020.05.01.20.22.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 May 2020 20:22:35 -0700 (PDT) From: "Daniel W. S. Almeida" X-Google-Original-From: Daniel W. S. Almeida To: mchehab+huawei@kernel.org, sean@mess.org, kstewart@linuxfoundation.org, allison@lohutok.net, tglx@linutronix.de Cc: "Daniel W. S. Almeida" , linux-media@vger.kernel.org, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org Subject: [RFC, WIP, v4 02/11] media: vidtv: implement a tuner driver Date: Sat, 2 May 2020 00:22:07 -0300 Message-Id: <20200502032216.197977-3-dwlsalmeida@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200502032216.197977-1-dwlsalmeida@gmail.com> References: <20200502032216.197977-1-dwlsalmeida@gmail.com> MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: "Daniel W. S. Almeida" 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. This dummy tuner should support common TV standards such as DVB-T/T2/S/S2, ISDB-T and ATSC when completed. Signed-off-by: Daniel W. S. Almeida --- drivers/media/test-drivers/vidtv/Makefile | 1 + .../media/test-drivers/vidtv/vidtv_tuner.c | 411 ++++++++++++++++++ 2 files changed, 412 insertions(+) create mode 100644 drivers/media/test-drivers/vidtv/vidtv_tuner.c diff --git a/drivers/media/test-drivers/vidtv/Makefile b/drivers/media/test-drivers/vidtv/Makefile index d1558d84eeaed..e625810a82603 100644 --- a/drivers/media/test-drivers/vidtv/Makefile +++ b/drivers/media/test-drivers/vidtv/Makefile @@ -1,2 +1,3 @@ # SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_DVB_VIDTV) += vidtv_tuner.o diff --git a/drivers/media/test-drivers/vidtv/vidtv_tuner.c b/drivers/media/test-drivers/vidtv/vidtv_tuner.c new file mode 100644 index 0000000000000..a790508f935b3 --- /dev/null +++ b/drivers/media/test-drivers/vidtv/vidtv_tuner.c @@ -0,0 +1,411 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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. + * + * The vidtv tuner should support common TV standards such as + * DVB-T/T2/S/S2, ISDB-T and ATSC when completed. + * + * Written by Daniel W. S. Almeida + */ + +#include +#include +#include +#include +#include +#include + +MODULE_DESCRIPTION("Virtual DTV Tuner"); +MODULE_AUTHOR("Daniel W. S. Almeida"); +MODULE_LICENSE("GPL"); + +struct vidtv_tuner_config { + struct dvb_frontend *fe; + u32 mock_power_up_delay_msec; + u32 mock_tune_delay_msec; + u32 vidtv_valid_dvb_t_freqs[8]; + u32 vidtv_valid_dvb_c_freqs[8]; + u32 vidtv_valid_dvb_s_freqs[8]; + u8 max_frequency_shift_hz; +}; + +struct vidtv_tuner_cnr_to_qual_s { + /* attempt to use the same values as libdvbv5 */ + u32 modulation; + u32 fec; + u32 cnr_ok, cnr_good; +}; + +struct vidtv_tuner_cnr_to_qual_s vidtv_tuner_c_cnr_2_qual[] = { + /* from libdvbv5 source code, in milli db */ + { QAM_256, FEC_NONE, 34000, 38000}, + { QAM_64, FEC_NONE, 30000, 34000}, +}; + +struct vidtv_tuner_cnr_to_qual_s vidtv_tuner_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}, +}; + +struct vidtv_tuner_cnr_to_qual_s vidtv_tuner_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 struct vidtv_tuner_cnr_to_qual_s vidtv_tuner_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}, +}; + +struct vidtv_tuner_hardware_state { + bool asleep; + u32 lock_status; + u32 if_frequency; + u32 tuned_frequency; + u32 bandwidth; +}; + +struct vidtv_tuner_dev { + struct dvb_frontend *fe; + struct vidtv_tuner_hardware_state hw_state; + struct vidtv_tuner_config config; +}; + +static struct vidtv_tuner_dev* +vidtv_tuner_get_dev(struct dvb_frontend *fe) +{ + struct i2c_client *client = fe->tuner_priv; + + return i2c_get_clientdata(client); +} + +static s32 vidtv_tuner_check_frequency_shift(struct dvb_frontend *fe) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + struct vidtv_tuner_config config = tuner_dev->config; + u32 *valid_freqs = NULL; + u32 array_sz = 0; + u32 i; + u32 shift; + + switch (c->delivery_system) { + case SYS_DVBT: + case SYS_DVBT2: + valid_freqs = config.vidtv_valid_dvb_t_freqs; + array_sz = ARRAY_SIZE(config.vidtv_valid_dvb_t_freqs); + break; + case SYS_DVBS: + case SYS_DVBS2: + valid_freqs = config.vidtv_valid_dvb_s_freqs; + array_sz = ARRAY_SIZE(config.vidtv_valid_dvb_s_freqs); + break; + case SYS_DVBC_ANNEX_A: + valid_freqs = config.vidtv_valid_dvb_c_freqs; + array_sz = ARRAY_SIZE(config.vidtv_valid_dvb_c_freqs); + break; + + default: + pr_warn("%s: unsupported delivery system: %u\n", + __func__, + c->delivery_system); + break; + } + + for (i = 0; i < array_sz; i++) { + shift = abs(c->frequency - valid_freqs[i]); + + if (!shift) + return 0; + + /* + * This will provide a value from 0 to 100 that would + * indicate how far is the tuned frequency from the + * right one. + */ + if (shift < config.max_frequency_shift_hz) + return shift * 100 / config.max_frequency_shift_hz; + } + + return -1; +} + +static int +vidtv_tuner_get_signal_strength(struct dvb_frontend *fe, u16 *strength) +{ + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + struct vidtv_tuner_cnr_to_qual_s *cnr2qual = NULL; + u32 array_size = 0; + s32 shift; + u32 i; + + shift = vidtv_tuner_check_frequency_shift(fe); + + switch (c->delivery_system) { + case SYS_DVBT: + case SYS_DVBT2: + cnr2qual = vidtv_tuner_t_cnr_2_qual; + array_size = ARRAY_SIZE(vidtv_tuner_t_cnr_2_qual); + break; + + case SYS_DVBS: + cnr2qual = vidtv_tuner_s_cnr_2_qual; + array_size = ARRAY_SIZE(vidtv_tuner_s_cnr_2_qual); + break; + + case SYS_DVBS2: + cnr2qual = vidtv_tuner_s2_cnr_2_qual; + array_size = ARRAY_SIZE(vidtv_tuner_s2_cnr_2_qual); + break; + + case SYS_DVBC_ANNEX_A: + cnr2qual = vidtv_tuner_c_cnr_2_qual; + array_size = ARRAY_SIZE(vidtv_tuner_c_cnr_2_qual); + break; + + default: + pr_warn("%s: unsupported delivery system: %u\n", + __func__, + c->delivery_system); + return -EINVAL; + } + + for (i = 0; i <= array_size; i++) { + if (cnr2qual[i].modulation != c->modulation || + cnr2qual[i].fec != c->fec_inner) + continue; + + if (!shift) { + *strength = cnr2qual[i].cnr_good; + return 0; + } + if (shift < 0) { /* Channel not tuned */ + *strength = 0; + return 0; + } + /* + * Channel tuned at wrong frequency. Simulate that the + * Carrier S/N ratio is not too good. + */ + + *strength = cnr2qual[i].cnr_ok - + (cnr2qual[i].cnr_good - cnr2qual[i].cnr_ok); + return 0; + } + + /* + * do a linear interpolation between 34dB and 10dB if we can't + * match against the table + */ + *strength = 34 - 24 * shift / 100; + return 0; +} + +static int vidtv_tuner_init(struct dvb_frontend *fe) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + struct vidtv_tuner_config config = tuner_dev->config; + + msleep_interruptible(config.mock_power_up_delay_msec); + + tuner_dev->hw_state.asleep = false; + tuner_dev->hw_state.if_frequency = 5000; + + return 0; +} + +static int vidtv_tuner_sleep(struct dvb_frontend *fe) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + tuner_dev->hw_state.asleep = true; + return 0; +} + +static int vidtv_tuner_suspend(struct dvb_frontend *fe) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + tuner_dev->hw_state.asleep = true; + return 0; +} + +static int vidtv_tuner_resume(struct dvb_frontend *fe) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + tuner_dev->hw_state.asleep = false; + return 0; +} + +static int vidtv_tuner_set_params(struct dvb_frontend *fe) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + struct vidtv_tuner_config config = tuner_dev->config; + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + u32 min_freq = fe->ops.tuner_ops.info.frequency_min_hz; + u32 max_freq = fe->ops.tuner_ops.info.frequency_max_hz; + u32 min_bw = fe->ops.tuner_ops.info.bandwidth_min; + u32 max_bw = fe->ops.tuner_ops.info.bandwidth_max; + + if (c->frequency < min_freq || c->frequency > max_freq || + c->bandwidth_hz < min_bw || c->bandwidth_hz > max_bw) { + tuner_dev->hw_state.lock_status = 0; + return -EINVAL; + } + + tuner_dev->hw_state.tuned_frequency = c->frequency; + tuner_dev->hw_state.bandwidth = c->bandwidth_hz; + tuner_dev->hw_state.lock_status = TUNER_STATUS_LOCKED; + + msleep_interruptible(config.mock_tune_delay_msec); + return 0; +} + +static int vidtv_tuner_set_config(struct dvb_frontend *fe, + void *priv_cfg) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + memcpy(&tuner_dev->config, priv_cfg, sizeof(tuner_dev->config)); + + return 0; +} + +static int vidtv_tuner_get_frequency(struct dvb_frontend *fe, + u32 *frequency) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + *frequency = tuner_dev->hw_state.tuned_frequency; + + return 0; +} + +static int vidtv_tuner_get_bandwidth(struct dvb_frontend *fe, + u32 *bandwidth) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + *bandwidth = tuner_dev->hw_state.bandwidth; + + return 0; +} + +static int vidtv_tuner_get_if_frequency(struct dvb_frontend *fe, + u32 *frequency) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + *frequency = tuner_dev->hw_state.if_frequency; + + return 0; +} + +static int vidtv_tuner_get_status(struct dvb_frontend *fe, u32 *status) +{ + struct vidtv_tuner_dev *tuner_dev = vidtv_tuner_get_dev(fe); + + *status = tuner_dev->hw_state.lock_status; + + return 0; +} + +static const struct dvb_tuner_ops vidtv_tuner_ops = { + .init = vidtv_tuner_init, + .sleep = vidtv_tuner_sleep, + .suspend = vidtv_tuner_suspend, + .resume = vidtv_tuner_resume, + .set_params = vidtv_tuner_set_params, + .set_config = vidtv_tuner_set_config, + .get_bandwidth = vidtv_tuner_get_bandwidth, + .get_frequency = vidtv_tuner_get_frequency, + .get_if_frequency = vidtv_tuner_get_if_frequency, + .get_status = vidtv_tuner_get_status, + .get_rf_strength = vidtv_tuner_get_signal_strength +}; + +static const struct i2c_device_id vidtv_tuner_i2c_id_table[] = { + {"vidtv_tuner", 0}, + {} +}; +MODULE_DEVICE_TABLE(i2c, vidtv_tuner_i2c_id_table); + +static int vidtv_tuner_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct vidtv_tuner_config *config = client->dev.platform_data; + struct dvb_frontend *fe = config->fe; + struct vidtv_tuner_dev *tuner_dev = NULL; + + tuner_dev = kzalloc(sizeof(*tuner_dev), GFP_KERNEL); + if (!tuner_dev) + return -ENOMEM; + + tuner_dev->fe = config->fe; + i2c_set_clientdata(client, tuner_dev); + + memcpy(&fe->ops.tuner_ops, + &vidtv_tuner_ops, + sizeof(struct dvb_tuner_ops)); + + fe->tuner_priv = client; + + return 0; +} + +static int vidtv_tuner_i2c_remove(struct i2c_client *client) +{ + struct vidtv_tuner_dev *tuner_dev = i2c_get_clientdata(client); + struct dvb_frontend *fe = tuner_dev->fe; + + memset(&fe->ops.tuner_ops, 0, sizeof(struct dvb_tuner_ops)); + fe->tuner_priv = NULL; + kfree(tuner_dev); + + return 0; +} + +static struct i2c_driver vidtv_tuner_i2c_driver = { + .driver = { + .name = "vidtv_tuner", + .suppress_bind_attrs = true, + }, + .probe = vidtv_tuner_i2c_probe, + .remove = vidtv_tuner_i2c_remove, + .id_table = vidtv_tuner_i2c_id_table, +}; +module_i2c_driver(vidtv_tuner_i2c_driver);