linux-toradex.git/drivers/acpi/dptf, branch v6.13

ACPI: Switch back to struct platform_driver::remove()

2024-11-12T20:30:30+00:00

After commit 0edb555a65d1 ("platform: Make platform_driver::remove()
return void") .remove() is (again) the right callback to implement for
platform drivers.

Convert all platform drivers below drivers/acpi to use .remove(), with
the eventual goal to drop struct platform_driver::remove_new(). As
.remove() and .remove_new() have the same prototypes, conversion is done
by just changing the structure member name in the driver initializer.

Signed-off-by: Uwe Kleine-König 
Link: https://patch.msgid.link/9ee1a9813f53698be62aab9d810b2d97a2a9f186.1731397722.git.u.kleine-koenig@baylibre.com
[ rjw: Subject edit ]
Signed-off-by: Rafael J. Wysocki

ACPI: DPTF: Add Lunar Lake support

2024-04-08T14:10:27+00:00

Add Lunar Lake ACPI IDs for DPTF devices.

Signed-off-by: Sumeet Pawnikar 
Signed-off-by: Rafael J. Wysocki

ACPI: DPTF: Convert to platform remove callback returning void

2024-02-27T14:57:33+00:00

The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.

To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new(), which already returns void. Eventually after all drivers
are converted, .remove_new() will be renamed to .remove().

Trivially convert these two drivers from always returning zero in the
remove callback to the void returning variant.

Signed-off-by: Uwe Kleine-König 
Signed-off-by: Rafael J. Wysocki

ACPI: DPTF: Drop stale link from Kconfig help

2022-09-28T15:26:25+00:00

The web site pointed to from the DPTF Kconfig help is not accessible
any more, so drop the link to it from there.

Signed-off-by: Rafael J. Wysocki

ACPI: DPTF: Support Meteor Lake

2022-05-25T13:37:07+00:00

Add Meteor Lake ACPI IDs for DPTF devices.

Signed-off-by: Sumeet Pawnikar 
Reviewed-by: Srinivas Pandruvada 
Signed-off-by: Rafael J. Wysocki

ACPI: DPTF: Add support for high frequency impedance notification

2022-05-06T18:51:42+00:00

Add high frequency impedance notification support under DPTF.
This returns high frequency impedance value that can be obtained
from battery fuel gauge whenever there is change over a threshold.
Also, corrected the typo from IMPEDANCED_CHNGED to IMPEDANCE_CHANGED.

Signed-off-by: Sumeet Pawnikar 
Signed-off-by: Rafael J. Wysocki

ACPI: DPTF: Correct description of INT3407 / INT3532 attributes

2022-04-22T14:57:42+00:00

Remove duplicate comments of PBSS for Battery steady state power and
correct the typo for PMAX Maximum platform power.

Signed-off-by: Sumeet Pawnikar 
Signed-off-by: Rafael J. Wysocki

ACPI: DPTF: Support Raptor Lake

2022-01-17T18:45:38+00:00

Add Raptor Lake ACPI IDs for DPTF devices.

Signed-off-by: Srinivas Pandruvada 
Signed-off-by: Rafael J. Wysocki

ACPI: DPTF: Update device ID in a comment

2021-11-24T16:40:22+00:00

There is a comment in dptf_pch_fivr.c which seemingly was added under
the assumption that the PCH FIVR driver would be used on Tiger Lake
platforms, but support for Alder Lake has been udded to it by commit
38748bcb940e ("ACPI: DPTF: Support Alder Lake"), so update the
comment to cover a broader range of platforms by changing the device
ID mentioned by it to INTC10xx.

Signed-off-by: Sumeet Pawnikar 
[ rjw: Subject and changelog rewrite ]
Signed-off-by: Rafael J. Wysocki

ACPI: DPTF: Add new PCH FIVR methods

2021-08-04T16:08:50+00:00

Some additional information is required for updating PCH FIVR values
upon WiFi channel changes.

New attributes added to the existing sysfs:

fivr_switching_freq_mhz	: Get the FIVR switching control frequency.
			  Uses ACPI method GFCS.

fivr_switching_fault_status: Read the FIVR switching frequency control
			     fault status. Uses ACPI method GFFS.

ssc_clock_info : Presents SSC (spread spectrum clock) information for
		 EMI (Electro magnetic interference) control. Use ACPI
		 method GEMI (refer to the description of GEMI method
		 below).

GFFS
This ACPI method is used to read the FIVR switching frequency control
fault status.
Bits	Description
[0:0]	Fault status when set to 1
[31:1]	Reserved

GFCS
This ACPI method is used to read the FIVR switching control frequency.
Bits	Description
[11:0]	Actual Frequency = value * XTAL_FREQ / 128
[31:12]	Reserved

GEMI
This ACPI method is used to read the programmed register value for
EMI (Electro magnetic interference) control.

Bits	Description
[7:0]	Sets clock spectrum spread percentage:
	0x00=0.2% , 0x3F=10%
	1 LSB = 0.1% increase in spread (for
	settings 0x01 thru 0x1C)
	1 LSB = 0.2% increase in spread (for
	settings 0x1E thru 0x3F)
[8]	When set to 1, enables spread
	spectrum clock
[9]	0: Triangle mode. FFC frequency
	walks around the Fcenter in a linear
	fashion
	1: Random walk mode. FFC frequency
	changes randomly within the SSC
	(Spread spectrum clock) range
[10]	0: No white noise. 1: Add white noise
	to spread waveform
[11]	When 1, future writes are ignored.

Signed-off-by: Srinivas Pandruvada 
Signed-off-by: Rafael J. Wysocki