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authorDaniel W. S. Almeida <dwlsalmeida@gmail.com>2020-08-21 15:58:45 +0300
committerMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-09-12 10:42:16 +0300
commit24fb190e92e09c819f432cdf366a1540cf52f1f2 (patch)
treef3313b5bda0ebe54e0dc745450f161e9a1e2a860 /drivers/media/test-drivers/vidtv/vidtv_tuner.c
parent5e8db34966222c34d7e98767a2d54b6bb3aa248d (diff)
downloadlinux-24fb190e92e09c819f432cdf366a1540cf52f1f2.tar.xz
media: vidtv: implement a tuner driver
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 <dwlsalmeida@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/media/test-drivers/vidtv/vidtv_tuner.c')
-rw-r--r--drivers/media/test-drivers/vidtv/vidtv_tuner.c427
1 files changed, 427 insertions, 0 deletions
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 000000000000..857668f8d714
--- /dev/null
+++ b/drivers/media/test-drivers/vidtv/vidtv_tuner.c
@@ -0,0 +1,427 @@
+// 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.
+ *
+ * Copyright (C) 2020 Daniel W. S. Almeida
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ":%s, %d: " fmt, __func__, __LINE__
+
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <media/dvb_frontend.h>
+#include <linux/printk.h>
+#include <linux/ratelimit.h>
+
+#include "vidtv_tuner.h"
+
+struct vidtv_tuner_cnr_to_qual_s {
+ /* attempt to use the same values as libdvbv5 */
+ u32 modulation;
+ u32 fec;
+ u32 cnr_ok;
+ u32 cnr_good;
+};
+
+static const 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},
+};
+
+static const 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},
+};
+
+static const 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 const 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 - Simulate the tuner hardware status
+ * @asleep: whether the tuner is asleep, i.e whether _sleep() or _suspend() was
+ * called.
+ * @lock_status: Whether the tuner has managed to lock on the requested
+ * frequency.
+ * @if_frequency: The tuner's intermediate frequency. Hardcoded for the purposes
+ * of simulation.
+ * @tuned_frequency: The actual tuned frequency.
+ * @bandwidth: The actual bandwidth.
+ *
+ * This structure is meant to simulate the status of the tuner hardware, as if
+ * we had a physical tuner hardware.
+ */
+struct vidtv_tuner_hardware_state {
+ bool asleep;
+ u32 lock_status;
+ u32 if_frequency;
+ u32 tuned_frequency;
+ u32 bandwidth;
+};
+
+/**
+ * struct vidtv_tuner_dev - The tuner struct
+ * @fe: A pointer to the dvb_frontend structure allocated by vidtv_demod
+ * @hw_state: A struct to simulate the tuner's hardware state as if we had a
+ * physical tuner hardware.
+ * @config: The configuration used to start the tuner module, usually filled
+ * by a bridge driver. For vidtv, this is filled by vidtv_bridge before the
+ * tuner module is probed.
+ */
+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)
+{
+ return i2c_get_clientdata(fe->tuner_priv);
+}
+
+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);
+
+ return -EINVAL;
+ }
+
+ 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 -EINVAL;
+}
+
+static int
+vidtv_tuner_get_signal_strength(struct dvb_frontend *fe, u16 *strength)
+{
+ struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+ const 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_ratelimited("%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[] = {
+ {"dvb_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 = "dvb_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);
+
+MODULE_DESCRIPTION("Virtual DVB Tuner");
+MODULE_AUTHOR("Daniel W. S. Almeida");
+MODULE_LICENSE("GPL");