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/linux-6.15/Documentation/firmware-guide/acpi/
Dnon-d0-probe.rst1 .. SPDX-License-Identifier: GPL-2.0
10 In some cases it may be preferred to leave certain devices powered off for the
22 The downside of using _DSC is that as the device is not powered on, even if
28 ---
33 the device will not be powered on (put in D0 state) for probe.
36 --------
41 .. code-block:: text
44 0 D0 Device fully powered on
48 4 D3cold Off
53 …cifications/ACPI/6.4/02_Definition_of_Terms/Definition_of_Terms.html#device-power-state-definitions
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/linux-6.15/Documentation/userspace-api/media/dvb/
Dfe-diseqc-reset-overload.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 FE_DISEQC_RESET_OVERLOAD - Restores the power to the antenna subsystem, if it was powered off due -…
31 If the bus has been automatically powered off due to power overload,
34 is manually powered off. Not all Digital TV adapters support this ioctl.
41 On error -1 is returned, and the ``errno`` variable is set
45 :ref:`Generic Error Codes <gen-errors>` chapter.
/linux-6.15/drivers/ata/
Dlibata-zpodd.c1 // SPDX-License-Identifier: GPL-2.0
11 static int zpodd_poweroff_delay = 30; /* 30 seconds for power off delay */
31 bool powered_off; /* ODD is powered off
85 if (be16_to_cpu(desc->feature_code) != 3) { in zpodd_get_mech_type()
90 if (desc->mech_type == 0 && desc->load == 0 && desc->eject == 1) { in zpodd_get_mech_type()
93 } else if (desc->mech_type == 1 && desc->load == 0 && in zpodd_get_mech_type()
94 desc->eject == 1) { in zpodd_get_mech_type()
108 struct zpodd *zpodd = dev->zpodd; in zpready()
115 sense_buf = dev->sector_buf; in zpready()
132 if (zpodd->mech_type == ODD_MECH_TYPE_SLOT) in zpready()
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/linux-6.15/drivers/pci/hotplug/
Dpciehp.h1 /* SPDX-License-Identifier: GPL-2.0+ */
6 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
8 * Copyright (C) 2003-2004 Intel Corporation
36 pci_dbg(ctrl->pcie->port, format, ## arg)
38 pci_err(ctrl->pcie->port, format, ## arg)
40 pci_info(ctrl->pcie->port, format, ## arg)
42 pci_warn(ctrl->pcie->port, format, ## arg)
47 * struct controller - PCIe hotplug controller
53 * @inband_presence_disabled: In-Band Presence Detect Disable supported by
75 * @button_work: work item to turn the slot on or off after 5 seconds
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/linux-6.15/include/linux/
Dreboot.h1 /* SPDX-License-Identifier: GPL-2.0 */
15 #define SYS_POWER_OFF 0x0003 /* Notify of system power off */
18 REBOOT_UNDEFINED = -1,
54 * Architecture-specific implementations of sys_reboot commands.
69 * sys-off handler API.
73 * Standard sys-off priority levels. Users are expected to set priorities
76 * SYS_OFF_PRIO_PLATFORM: Use this for platform-level handlers.
86 #define SYS_OFF_PRIO_PLATFORM -256
87 #define SYS_OFF_PRIO_LOW -128
96 * Handlers prepare system to be powered off. Handlers are
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/linux-6.15/include/drm/
Ddrm_panel.h17 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
43 * struct drm_panel_funcs - perform operations on a given panel
59 * necessary to turn off the panel to avoid visual glitches. This is done in
61 * turning off the backlight and waiting for some time to make sure no image
94 * Disable panel (turn off back light, etc.).
103 * Turn off panel.
143 * Allows panels to create panels-specific debugfs files.
152 * Called after the panel has been powered on.
159 * Called before the panel is powered off.
188 * struct drm_panel - DRM panel object
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/linux-6.15/drivers/platform/x86/
Dtoshiba_bluetooth.c1 // SPDX-License-Identifier: GPL-2.0-only
9 * normal people aren't meant to understand :-)
35 bool powered; member
78 return -ENXIO; in toshiba_bluetooth_present()
83 return -ENODEV; in toshiba_bluetooth_present()
97 return -ENXIO; in toshiba_bluetooth_status()
110 return -ENXIO; in toshiba_bluetooth_enable()
116 return -ENXIO; in toshiba_bluetooth_enable()
128 pr_err("Could not power OFF Bluetooth device\n"); in toshiba_bluetooth_disable()
129 return -ENXIO; in toshiba_bluetooth_disable()
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/linux-6.15/include/dt-bindings/sound/
Dtlv320adc3xxx.h1 /* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
10 #define ADC3XXX_GPIO_DISABLED 0 /* I/O buffers powered down */
11 #define ADC3XXX_GPIO_INPUT 1 /* Various non-GPIO inputs */
21 /* values 11-15 reserved */
23 #define ADC3XXX_MICBIAS_OFF 0 /* Micbias pin powered off */
/linux-6.15/arch/arm/include/asm/
Dmcpm.h1 /* SPDX-License-Identifier: GPL-2.0-only */
6 * Copyright: (C) 2012-2013 Linaro Limited
40 * branch once it is ready to re-enter the kernel using ptr, or NULL if it
59 * mcpm_is_available - returns whether MCPM is initialized and available
66 * mcpm_cpu_power_up - make given CPU in given cluster runable
71 * The identified CPU is brought out of reset. If the cluster was powered
87 * mcpm_cpu_power_down - power the calling CPU down
89 * The calling CPU is powered down.
92 * then the cluster is prepared for power-down too.
96 * On success this does not return. Re-entry in the kernel is expected
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/linux-6.15/drivers/hwtracing/coresight/
Dcoresight-cpu-debug.c1 // SPDX-License-Identifier: GPL-2.0
29 #include "coresight-priv.h"
69 * 0b0000 - Sample offset applies based on the instruction state, we
71 * 0b0001 - No offset applies.
72 * 0b0010 - No offset applies, but do not use in AArch32 mode
118 writel_relaxed(0x0, drvdata->base + EDOSLAR); in debug_os_unlock()
130 * - CPU power domain is powered off;
131 * - The OS Double Lock is locked;
137 /* CPU is powered off */ in debug_access_permitted()
138 if (!(drvdata->edprsr & EDPRSR_PU)) in debug_access_permitted()
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/linux-6.15/Documentation/arch/arm/
Dcluster-pm-race-avoidance.rst2 Cluster-wide Power-up/power-down race avoidance algorithm
16 ---------
19 ability to turn off individual CPUs when the system is idle, reducing
23 to have the ability to turn off entire clusters.
25 Turning entire clusters off and on is a risky business, because it
29 cluster-level operations are only performed when it is truly safe to do
35 disabling those mechanisms may itself be a non-atomic operation (such as
38 power-down and power-up at the cluster level.
46 -----------
50 - DOWN
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/linux-6.15/Documentation/ABI/testing/
Dsysfs-bus-usb-devices-usbsevseg1 What: /sys/bus/usb/.../powered
5 Description: Controls whether the device's display will powered.
6 A value of 0 is off and a non-zero value is on.
28 hex: each character is between 0-15
29 ascii: each character is between '0'-'9' and 'A'-'F'.
Dsysfs-driver-bd9571mwv-regulator1 What: /sys/bus/i2c/devices/.../bd9571mwv-regulator.*.auto/backup_mode
6 if DDR power rails will be kept powered during system suspend.
7 ("on"/"1" = enabled, "off"/"0" = disabled).
18 wake-up switch,
19 2. Switch accessory power switch off, to prepare for
/linux-6.15/Documentation/trace/coresight/
Dcoresight-cpu-debug.rst9 ------------
11 Coresight CPU debug module is defined in ARMv8-a architecture reference manual
13 debug module and it is mainly used for two modes: self-hosted debug and
16 explore debugging method which rely on self-hosted debug mode, this document
19 The debug module provides sample-based profiling extension, which can be used
21 every CPU has one dedicated debug module to be connected. Based on self-hosted
29 --------------
31 - During driver registration, it uses EDDEVID and EDDEVID1 - two device ID
32 registers to decide if sample-based profiling is implemented or not. On some
36 - At the time this documentation was written, the debug driver mainly relies on
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/linux-6.15/arch/mips/include/asm/
Dmips-cps.h1 /* SPDX-License-Identifier: GPL-2.0-or-later */
18 #define CPS_ACCESSOR_A(unit, off, name) \ argument
21 return mips_##unit##_base + (off); \
92 #define CPS_ACCESSOR_RO(unit, sz, off, name) \ argument
93 CPS_ACCESSOR_A(unit, off, name) \
96 #define CPS_ACCESSOR_WO(unit, sz, off, name) \ argument
97 CPS_ACCESSOR_A(unit, off, name) \
100 #define CPS_ACCESSOR_RW(unit, sz, off, name) \ argument
101 CPS_ACCESSOR_A(unit, off, name) \
106 #include <asm/mips-cm.h>
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/linux-6.15/Documentation/devicetree/bindings/media/i2c/
Dadv7343.txt3 The ADV7343 are high speed, digital-to-analog video encoders in a 64-lead LQFP
4 package. Six high speed, 3.3 V, 11-bit video DACs provide support for composite
5 (CVBS), S-Video (Y-C), and component (YPrPb/RGB) analog outputs in standard
10 - compatible: Must be "adi,adv7343"
13 - adi,power-mode-sleep-mode: on enable the current consumption is reduced to
16 - adi,power-mode-pll-ctrl: PLL and oversampling control. This control allows
17 internal PLL 1 circuit to be powered down and the
18 oversampling to be switched off.
19 - ad,adv7343-power-mode-dac: array configuring the power on/off DAC's 1..6,
20 0 = OFF and 1 = ON, Default value when this
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/linux-6.15/drivers/platform/chrome/
Dcros_hps_i2c.c1 // SPDX-License-Identifier: GPL-2.0
31 gpiod_set_value_cansleep(hps->enable_gpio, state); in hps_set_power()
36 struct hps_drvdata *hps = container_of(file->private_data, in hps_open()
38 struct device *dev = &hps->client->dev; in hps_open()
45 struct hps_drvdata *hps = container_of(file->private_data, in hps_release()
47 struct device *dev = &hps->client->dev; in hps_release()
63 hps = devm_kzalloc(&client->dev, sizeof(*hps), GFP_KERNEL); in hps_i2c_probe()
65 return -ENOMEM; in hps_i2c_probe()
67 hps->misc_device.parent = &client->dev; in hps_i2c_probe()
68 hps->misc_device.minor = MISC_DYNAMIC_MINOR; in hps_i2c_probe()
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/linux-6.15/drivers/gpu/drm/udl/
Dudl_proto.h1 /* SPDX-License-Identifier: GPL-2.0-only */
28 /* Display-mode settings */
43 /* On/Off for driving the DisplayLink framebuffer to the display */
47 #define UDL_BLANKMODE_VSYNC_OFF 0x03 /* vsync off, blanked */
48 #define UDL_BLANKMODE_HSYNC_OFF 0x05 /* hsync off, blanked */
49 #define UDL_BLANKMODE_POWERDOWN 0x07 /* powered off; requires modeset */
/linux-6.15/kernel/power/
DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
8 powered and thus its contents are preserved, such as the
9 suspend-to-RAM state (e.g. the ACPI S3 state).
17 This allows you to turn off the freezer for suspend. If this is
20 Turning OFF this setting is NOT recommended! If in doubt, say Y.
30 user-space before invoking suspend. There's a run-time switch
32 This setting changes the default for the run-tim switch. Say Y
48 system and powers it off; and restores that checkpoint on reboot.
60 for suspend states like suspend-to-RAM (STR) often don't work very
72 <file:Documentation/power/swsusp-and-swap-files.rst>).
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/linux-6.15/arch/arm/boot/dts/marvell/
Dkirkwood-nas2big.dts1 // SPDX-License-Identifier: GPL-2.0
11 /dts-v1/;
13 #include "kirkwood-netxbig.dtsi"
17 compatible = "lacie,nas2big", "lacie,netxbig", "marvell,kirkwood-88f6282", "marvell,kirkwood";
26 stdout-path = &uart0;
31 /* The on-chip RTC is not powered (no supercap). */
37 * the other netxbig-compatible boards.
48 compatible = "gpio-fan";
49 alarm-gpios = <&gpio0 25 GPIO_ACTIVE_LOW>;
54 compatible = "simple-bus";
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/linux-6.15/Documentation/driver-api/usb/
Dpower-management.rst1 .. _usb-power-management:
7 :Date: Last-updated: February 2014
11 ---------
17 * Changing the default idle-delay time
31 -------------------------
35 component is ``suspended`` it is in a nonfunctional low-power state; it
36 might even be turned off completely. A suspended component can be
37 ``resumed`` (returned to a functional full-power state) when the kernel
45 device is turned off while the system as a whole remains running, we
67 ----------------------
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/linux-6.15/drivers/w1/slaves/
Dw1_ds28e04.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * w1_ds28e04.c - w1 family 1C (DS28E04) driver
26 * If it was disabled a parasite powered device might not get the required
28 * parasite powered devices have a better chance of getting the current
34 /* enable/disable CRC checking on DS28E04-100 memory accesses */
60 static inline size_t w1_f1C_fix_count(loff_t off, size_t count, size_t size) in w1_f1C_fix_count() argument
62 if (off > size) in w1_f1C_fix_count()
65 if ((off + count) > size) in w1_f1C_fix_count()
66 return size - off; in w1_f1C_fix_count()
75 int off = block * W1_PAGE_SIZE; in w1_f1C_refresh_block() local
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/linux-6.15/Documentation/devicetree/bindings/power/
Dpower-domain.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/power/power-domain.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Rafael J. Wysocki <rjw@rjwysocki.net>
11 - Kevin Hilman <khilman@kernel.org>
12 - Ulf Hansson <ulf.hansson@linaro.org>
25 \#power-domain-cells property in the PM domain provider node.
29 pattern: "^(power-controller|power-domain|performance-domain)([@-].*)?$"
31 domain-idle-states:
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/linux-6.15/Documentation/misc-devices/
Dtps6594-pfsm.rst1 .. SPDX-License-Identifier: GPL-2.0
12 Strictly speaking, PFSM (Pre-configurable Finite State Machine) is not
17 some voltage domains remain energized while others can be off.
23 ---------------
25 - tps6594-q1
26 - tps6593-q1
27 - lp8764-q1
32 drivers/misc/tps6594-pfsm.c
43 All device resources are powered down. The processor is off, and
48 required to be always-on, are turned off (low-power).
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/linux-6.15/drivers/cpuidle/
Dcpuidle-tegra.c1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (c) 2010-2013, NVIDIA Corporation.
15 #define pr_fmt(fmt) "tegra-cpuidle: " fmt
68 while (retries--) { in tegra_cpuidle_wait_for_secondary_cpus_parking()
74 * shutdown in order to power-off CPU's cluster safely. in tegra_cpuidle_wait_for_secondary_cpus_parking()
76 * it takes about 40-150us in average and over 1000us in in tegra_cpuidle_wait_for_secondary_cpus_parking()
85 } while (timeout_us--); in tegra_cpuidle_wait_for_secondary_cpus_parking()
94 return -ETIMEDOUT; in tegra_cpuidle_wait_for_secondary_cpus_parking()
134 if (err && err != -ENOSYS) in tegra_cpuidle_c7_enter()
157 return -EINTR; in tegra_cpuidle_coupled_barrier()
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