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/linux/Documentation/ABI/testing/
H A Dsysfs-bus-iio-adc-hi84356 Program sensor type for threshold detector inputs.
7 Could be either "GND-Open" or "Supply-Open" mode. Y is a
8 threshold detector input channel. Channels 0..7, 8..15, 16..23
16 Channel Y low voltage threshold. If sensor input voltage goes lower then
17 this value then the threshold falling event is pushed.
18 Depending on in_voltageY_sensing_mode the low voltage threshold
19 is separately set for "GND-Open" and "Supply-Open" modes.
20 Channels 0..31 have common low threshold values, but could have different
23 The low voltage threshold range is between 2..21V.
27 If falling threshold results hysteresis to odd value then rising
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/linux/Documentation/trace/
H A Dhwlat_detector.rst2 Hardware Latency Detector
6 -------------
24 The hardware latency detector works by hogging one of the cpus for configurable
31 Note that the hwlat detector should *NEVER* be used in a production environment.
36 ------
40 redefine the threshold in microseconds (us) above which latency spikes will
50 - width - time period to sample with CPUs held (usecs)
52 - window - total period of sampling, width being inside (usecs)
55 for every 1,000,000 usecs (1s) the hwlat detector will spin for 500,000 usecs
57 change to a default of 10 usecs. If any latencies that exceed the threshold is
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/linux/Documentation/devicetree/bindings/iio/adc/
H A Dholt,hi8435.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Holt Integrated Circuits HI-8435 SPI threshold detector
10 - Vladimir Barinov <vladimir.barinov@cogentembedded.com>
13 Datasheet: http://www.holtic.com/documents/427-hi-8435_v-rev-lpdf.do
27 "#io-channel-cells":
31 - compatible
32 - reg
35 - $ref: /schemas/spi/spi-peripheral-props.yaml#
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/linux/Documentation/admin-guide/
H A Dlockup-watchdogs.rst2 Softlockup detector and hardlockup detector (aka nmi_watchdog)
14 "softlockup_panic" (see "Documentation/admin-guide/kernel-parameters.rst" for
26 (see "Documentation/admin-guide/kernel-parameters.rst" for details).
43 (compile-time initialized to 10 and configurable through sysctl of the
46 'hardlockup detector' (the handler for the NMI perf event) will
52 for 2*watchdog_thresh seconds (the softlockup threshold) the
53 'softlockup detector' (coded inside the hrtimer callback function)
60 detector kicks in.
64 event. The right value for a particular environment is a trade-off
77 to continue to run on the housekeeping (non-tickless) cores means
/linux/include/soc/canaan/
H A Dk210-sysctl.h1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Copyright (C) 2019-20 Sean Anderson <seanga2@gmail.com>
11 * Taken from Kendryte SDK (kendryte-standalone-sdk).
19 #define K210_SYSCTL_ROM_ERROR 0x1C /* AXI ROM detector */
26 #define K210_SYSCTL_THR0 0x38 /* Clock threshold controller 0 */
27 #define K210_SYSCTL_THR1 0x3C /* Clock threshold controller 1 */
28 #define K210_SYSCTL_THR2 0x40 /* Clock threshold controller 2 */
29 #define K210_SYSCTL_THR3 0x44 /* Clock threshold controller 3 */
30 #define K210_SYSCTL_THR4 0x48 /* Clock threshold controller 4 */
31 #define K210_SYSCTL_THR5 0x4C /* Clock threshold controller 5 */
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/linux/drivers/media/dvb-frontends/
H A Dz0194a.h1 /* SPDX-License-Identifier: GPL-2.0-only */
6 * see Documentation/driver-api/media/drivers/dvb-usb.rst for more information
56 0x15, 0xc9, /* lock detector threshold */
68 0x29, 0x1e, /* 1/2 threshold */
69 0x2a, 0x14, /* 2/3 threshold */
70 0x2b, 0x0f, /* 3/4 threshold */
71 0x2c, 0x09, /* 5/6 threshold */
72 0x2d, 0x05, /* 7/8 threshold */
H A Dbsru6.h1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * bsru6.h - ALPS BSRU6 tuner support (moved from budget-ci.c)
27 0x15, 0xc9, // lock detector threshold
39 0x29, 0x1e, // 1/2 threshold
40 0x2a, 0x14, // 2/3 threshold
41 0x2b, 0x0f, // 3/4 threshold
42 0x2c, 0x09, // 5/6 threshold
43 0x2d, 0x05, // 7/8 threshold
89 struct dtv_frontend_properties *p = &fe->dtv_property_cache; in alps_bsru6_tuner_set_params()
93 struct i2c_adapter *i2c = fe->tuner_priv; in alps_bsru6_tuner_set_params()
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H A Dbsbe1.h1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * bsbe1.h - ALPS BSBE1 tuner support
26 0x15, 0xc9, /* lock detector threshold */
57 struct dtv_frontend_properties *p = &fe->dtv_property_cache; in alps_bsbe1_tuner_set_params()
62 struct i2c_adapter *i2c = fe->tuner_priv; in alps_bsbe1_tuner_set_params()
64 if ((p->frequency < 950000) || (p->frequency > 2150000)) in alps_bsbe1_tuner_set_params()
65 return -EINVAL; in alps_bsbe1_tuner_set_params()
67 div = p->frequency / 1000; in alps_bsbe1_tuner_set_params()
73 if (fe->ops.i2c_gate_ctrl) in alps_bsbe1_tuner_set_params()
74 fe->ops.i2c_gate_ctrl(fe, 1); in alps_bsbe1_tuner_set_params()
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/linux/kernel/
H A Dwatchdog.c1 // SPDX-License-Identifier: GPL-2.0
8 * detector, so thanks to Ingo for the initial implementation.
9 * Some chunks also taken from the old x86-specific nmi watchdog code, thanks
62 * Should we panic when a soft-lockup or hard-lockup occurs:
177 * Prevent multiple hard-lockup reports if one cpu is already in watchdog_hardlockup_check()
231 * These functions can be overridden based on the configured hardlockdup detector.
234 * softlockup watchdog start and stop. The detector must select the
242 * Watchdog-detector specific API.
250 return -ENODEV; in watchdog_hardlockup_probe()
254 * watchdog_hardlockup_stop - Stop the watchdog for reconfiguration
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H A Dwatchdog_perf.c1 // SPDX-License-Identifier: GPL-2.0
8 * detector, so thanks to Ingo for the initial implementation.
9 * Some chunks also taken from the old x86-specific nmi watchdog code, thanks
40 * watchdog. That means the hrtimer should fire 2-3 times before in watchdog_update_hrtimer_threshold()
42 * unhalted CPU cycles, so if Turbo-Mode is enabled the CPU cycles in watchdog_update_hrtimer_threshold()
45 * frequency. Depending on the Turbo-Mode factor this might be fast in watchdog_update_hrtimer_threshold()
49 * The sample threshold is used to check in the NMI handler whether in watchdog_update_hrtimer_threshold()
53 * Set this to 4/5 of the actual watchdog threshold period so the in watchdog_update_hrtimer_threshold()
55 * watchdog threshold. in watchdog_update_hrtimer_threshold()
64 delta = now - __this_cpu_read(last_timestamp); in watchdog_check_timestamp()
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/linux/kernel/trace/
H A Dtrace_hwlat.c1 // SPDX-License-Identifier: GPL-2.0
3 * trace_hwlat.c - A simple Hardware Latency detector.
20 * Although certain hardware-inducing latencies are necessary (for example,
22 * and remote management) they can wreak havoc upon any OS-level performance
23 * guarantees toward low-latency, especially when the OS is not even made
27 * sampling the built-in CPU timer, looking for discontiguous readings.
31 * environment requiring any kind of low-latenc
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/linux/drivers/net/wireless/ath/
H A Ddfs_pattern_detector.c25 * struct radar_types - contains array of patterns defined for one DFS domain
36 /* percentage on ppb threshold to trigger detection */
38 #define PPB_THRESH_RATE(PPB, RATE) ((PPB * RATE + 100 - RATE) / 100)
43 #define WIDTH_LOWER(X) ((X*(100-WIDTH_TOLERANCE)+50)/100)
49 (PRF2PRI(PMAX) - PRI_TOLERANCE), \
54 /* radar types as defined by ETSI EN-301-893 v1.5.1 */
74 PMIN - PRI_TOLERANCE, \
106 PMIN - PRI_TOLERANCE, \
135 * get_dfs_domain_radar_types() - get radar types for a given DFS domain
145 if (dfs_domains[i]->region == region) in get_dfs_domain_radar_types()
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/linux/drivers/net/pcs/
H A Dpcs-xpcs-nxp.c1 // SPDX-License-Identifier: GPL-2.0
4 #include <linux/pcs/pcs-xpcs.h>
5 #include "pcs-xpcs.h"
69 * normal non-inverted behavior, the TX lane polarity must be inverted in the
144 /* Program threshold for receiver signal detector. in nxp_sja1110_pma_config()
145 * Enable control of RXPLL by receiver signal detector to disable RXPLL in nxp_sja1110_pma_config()
168 /* Program continuous-time linear equalizer (CTLE) settings. */ in nxp_sja1110_pma_config()
/linux/drivers/iio/adc/
H A Dhi8435.c1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Holt Integrated Circuits HI-8435 threshold detector driver
24 /* Register offsets for HI-8435 */
50 unsigned threshold_lo[2]; /* GND-Open and Supply-Open thresholds */
51 unsigned threshold_hi[2]; /* GND-Open and Supply-Open thresholds */
58 return spi_write_then_read(priv->spi, &reg, 1, val, 1); in hi8435_readb()
67 ret = spi_write_then_read(priv->spi, &reg, 1, &be_val, 2); in hi8435_readw()
79 ret = spi_write_then_read(priv->spi, &reg, 1, &be_val, 4); in hi8435_readl()
87 priv->reg_buffer[0] = reg | HI8435_WRITE_OPCODE; in hi8435_writeb()
88 priv->reg_buffer[1] = val; in hi8435_writeb()
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H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
10 bool "ST-Ericsson AB8500 GPADC driver"
45 Say yes here to build support for Analog Devices AD4130-8 SPI analog
73 Say yes here to build support for Analog Devices AD7091R-5 ADC.
81 Say yes here to build support for Analog Devices AD7091R-2, AD7091R-4,
82 and AD7091R-8 ADC.
88 tristate "Analog Devices AD7124 and similar sigma-delta ADCs driver"
92 Say yes here to build support for Analog Devices AD7124-4 and AD7124-8
107 - AD7172-2
108 - AD7173-8
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H A Dstm32-dfsdm.h1 /* SPDX-License-Identifier: GPL-2.0 */
5 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
15 * STM32 DFSDM - global register map
18 * ----------------------------------------------------------
20 * ----------------------------------------------------------
22 * ----------------------------------------------------------
24 * ----------------------------------------------------------
26 * ----------------------------------------------------------
28 * ----------------------------------------------------------
30 * ----------------------------------------------------------
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/linux/arch/powerpc/kernel/
H A Dwatchdog.c1 // SPDX-License-Identifier: GPL-2.0
37 * period, and updates a per-cpu timestamp and a "pending" cpumask. This is
41 * The local soft-NMI, and the SMP checker.
43 * The soft-NMI checker can detect lockups on the local CPU. When interrupts
44 * are disabled with local_irq_disable(), platforms that use soft-masking
50 * The soft-NMI checker will compare the heartbeat timestamp for this CPU
52 * watchdog threshold.
54 * The limitation of the soft-NMI watchdog is that it does not work when
66 * not been updated for a period exceeding the watchdog threshold, then it
131 hard_irq_disable(); /* Make it soft-NMI safe */ in wd_smp_lock()
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/linux/drivers/iio/accel/
H A Dsca3000.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * sca3000_core.c -- support VTI sca3000 series accelerometers via SPI
44 /* Temp read untested - the e05 doesn't have the sensor */
54 * is below a threshold for equivalent of 25cm drop
63 * (approx 1 - 25Hz) and then a programmable threshold used to trigger
82 /* Only available for SCA3000-D03 and SCA3000-D01 */
104 * Control which motion detector interrupts are on.
138 * Bypass - Bypass the low-pass filter in the signal channel so as to increase
141 * Narrow - Narrow low-pass filtering of the signal channel and half output
144 * Wide - Widen low-pass filtering of signal channel to increase bandwidth
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/linux/sound/soc/fsl/
H A Dfsl_micfil.c1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
19 #include <linux/dma/imx-dma.h>
114 { .compatible = "fsl,imx8mm-micfil", .data = &fsl_micfil_imx8mm },
115 { .compatible = "fsl,imx8mp-micfil", .data = &fsl_micfil_imx8mp },
116 { .compatible = "fsl,imx93-micfil", .data = &fsl_micfil_imx93 },
140 switch (micfil->quality) { in micfil_set_quality()
161 return regmap_update_bits(micfil->regmap, REG_MICFIL_CTRL2, in micfil_set_quality()
172 ucontrol->value.integer.value[0] = micfil->quality; in micfil_quality_get()
183 micfil->quality = ucontrol->value.integer.value[0]; in micfil_quality_set()
199 "Cut-off @1750Hz",
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/linux/sound/soc/codecs/
H A Dssm2518.c1 // SPDX-License-Identifier: GPL-2.0-only
6 * Author: Lars-Peter Clausen <lars@metafoo.de>
141 static const DECLARE_TLV_DB_MINMAX_MUTE(ssm2518_vol_tlv, -7125, 2400);
142 static const DECLARE_TLV_DB_SCALE(ssm2518_compressor_tlv, -3400, 200, 0);
143 static const DECLARE_TLV_DB_SCALE(ssm2518_expander_tlv, -8100, 300, 0);
144 static const DECLARE_TLV_DB_SCALE(ssm2518_noise_gate_tlv, -9600, 300, 0);
145 static const DECLARE_TLV_DB_SCALE(ssm2518_post_drc_tlv, -2400, 300, 0);
148 0, 7, TLV_DB_SCALE_ITEM(-2200, 200, 0),
149 7, 15, TLV_DB_SCALE_ITEM(-800, 100, 0),
186 SOC_SINGLE("Playback De-emphasis Switch", SSM2518_REG_MUTE_CTRL,
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/linux/Documentation/devicetree/bindings/iio/addac/
H A Dadi,ad74115.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Cosmin Tanislav <cosmin.tanislav@analog.com>
13 The AD74115H is a single-channel software configurable input/output
16 temperature detector, and thermocouple measurements integrated into a single
17 chip solution with an SPI interface. The device features a 16-bit ADC and a
18 14-bit DAC.
25 - adi,ad74115h
30 spi-max-frequency:
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/linux/Documentation/admin-guide/sysctl/
H A Dkernel.rst5 .. See scripts/check-sysctl-docs to keep this up to date
13 Documentation/admin-guide/sysctl/index.rst.
15 ------------------------------------------------------------------------------
39 If BSD-style process accounting is enabled these values control
71 The machine hardware name, the same output as ``uname -m``
129 Ctrl-Alt-Delete). Writing a value to this file which doesn't
130 correspond to a running process will result in ``-ESRCH``.
132 See also `ctrl-alt-del`_.
225 ctrl-alt-del
228 When the value in this file is 0, ctrl-alt-del is trapped and
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/linux/drivers/media/pci/tw5864/
H A Dtw5864-reg.h1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * TW5864 driver - registers description
8 /* According to TW5864_datasheet_0.6d.pdf, tw5864b1-ds.pdf */
10 /* Register Description - Direct Map Space */
11 /* 0x0000 ~ 0x1ffc - H264 Register Map */
76 * 0->3 4 VLC data buffer in DDR (1M each)
77 * 0->7 8 VLC data buffer in DDR (512k each)
147 /* DDR-DPR Burst Read Enable */
157 * 0 Single R/W Access (Host <-> DDR)
158 * 1 Burst R/W Access (Host <-> DPR)
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/linux/drivers/net/wireless/ath/ath5k/
H A Dphy.c2 * Copyright (c) 2004-2007 Reyk Floeter <reyk@openbsd.org>
3 * Copyright (c) 2006-2009 Nick Kossifidis <mickflemm@gmail.com>
4 * Copyright (c) 2007-2008 Jiri Slaby <jirislaby@gmail.com>
5 * Copyright (c) 2008-2009 Felix Fietkau <nbd@openwrt.org>
42 * Here we handle the low-level functions related to baseband
48 * - Channel setting/switching
50 * - Automatic Gain Control (AGC) calibration
52 * - Noise Floor calibration
54 * - I/Q imbalance calibration (QAM correction)
56 * - Calibration due to thermal changes (gain_F)
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/linux/sound/pci/asihpi/
H A Dhpi.h1 /* SPDX-License-Identifier: GPL-2.0-only */
5 Copyright (C) 1997-2011 AudioScience Inc. <support@audioscience.com>
14 The HPI is a low-level hardware abstraction layer to all
17 (C) Copyright AudioScience Inc. 1998-2010
37 /** 8-bit unsigned PCM. Windows equivalent is WAVE_FORMAT_PCM. */
39 /** 16-bit signed PCM. Windows equivalent is WAVE_FORMAT_PCM. */
41 /** MPEG-1 Layer-1. */
43 /** MPEG-1 Layer-2.
67 <tr><td>256<td>-<td>X
68 <tr><td>320<td>-<td>X
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