linux.git/drivers/pps/generators, branch v6.18.21

pps: generators: tio: fix platform_set_drvdata()

2025-04-15T16:22:32+00:00

platform_set_drvdata() is setting a double pointer to struct pps_tio as
driver_data, which will point to the local stack of probe function instead
of intended data. Set driver_data correctly and fix illegal memory access
by its user.

 BUG: unable to handle page fault for address: ffffc9000117b738
 RIP: 0010:hrtimer_active+0x2b/0x60
 Call Trace:
  ? hrtimer_active+0x2b/0x60
  hrtimer_cancel+0x19/0x50
  pps_gen_tio_remove+0x1e/0x80 [pps_gen_tio]

Fixes: c89755d1111f ("pps: generators: Add PPS Generator TIO Driver")
Signed-off-by: Raag Jadav 
Acked-by: Rodolfo Giometti 
Reviewed-by: Andy Shevchenko 
Link: https://lore.kernel.org/r/20250318114038.2058677-1-raag.jadav@intel.com
Signed-off-by: Greg Kroah-Hartman

treewide: Convert new and leftover hrtimer_init() users

2025-04-05T08:30:17+00:00

hrtimer_setup() takes the callback function pointer as argument and
initializes the timer completely.

Replace hrtimer_init() and the open coded initialization of
hrtimer::function with the new setup mechanism.

Coccinelle scripted cleanup.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Ingo Molnar

treewide: Switch/rename to timer_delete[_sync]()

2025-04-05T08:30:12+00:00

timer_delete[_sync]() replaces del_timer[_sync](). Convert the whole tree
over and remove the historical wrapper inlines.

Conversion was done with coccinelle plus manual fixups where necessary.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Ingo Molnar

Merge tag 'char-misc-6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2025-04-01T18:26:08+00:00

Pull char / misc / IIO driver updates from Greg KH:
 "Here is the big set of char, misc, iio, and other smaller driver
  subsystems for 6.15-rc1. Lots of stuff in here, including:

   - loads of IIO changes and driver updates

   - counter driver updates

   - w1 driver updates

   - faux conversions for some drivers that were abusing the platform
     bus interface

   - coresight driver updates

   - rust miscdevice binding updates based on real-world-use

   - other minor driver updates

  All of these have been in linux-next with no reported issues for quite
  a while"

* tag 'char-misc-6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (292 commits)
  samples: rust_misc_device: fix markup in top-level docs
  Coresight: Fix a NULL vs IS_ERR() bug in probe
  misc: lis3lv02d: convert to use faux_device
  tlclk: convert to use faux_device
  regulator: dummy: convert to use the faux device interface
  bus: mhi: host: Fix race between unprepare and queue_buf
  coresight: configfs: Constify struct config_item_type
  doc: iio: ad7380: describe offload support
  iio: ad7380: add support for SPI offload
  iio: light: Add check for array bounds in veml6075_read_int_time_ms
  iio: adc: ti-ads7924 Drop unnecessary function parameters
  staging: iio: ad9834: Use devm_regulator_get_enable()
  staging: iio: ad9832: Use devm_regulator_get_enable()
  iio: gyro: bmg160_spi: add of_match_table
  dt-bindings: iio: adc: Add i.MX94 and i.MX95 support
  iio: adc: ad7768-1: remove unnecessary locking
  Documentation: ABI: add wideband filter type to sysfs-bus-iio
  iio: adc: ad7768-1: set MOSI idle state to prevent accidental reset
  iio: adc: ad7768-1: Fix conversion result sign
  iio: adc: ad7124: Benefit of dev = indio_dev->dev.parent in ad7124_parse_channel_config()
  ...

pps: generators: Add PPS Generator TIO Driver

2025-02-21T09:46:49+00:00

The Intel Timed IO PPS generator driver outputs a PPS signal using
dedicated hardware that is more accurate than software actuated PPS.
The Timed IO hardware generates output events using the ART timer.
The ART timer period varies based on platform type, but is less than 100
nanoseconds for all current platforms. Timed IO output accuracy is
within 1 ART period.

PPS output is enabled by writing '1' the 'enable' sysfs attribute. The
driver uses hrtimers to schedule a wake-up 10 ms before each event
(edge) target time. At wakeup, the driver converts the target time in
terms of CLOCK_REALTIME to ART trigger time and writes this to the Timed
IO hardware. The Timed IO hardware generates an event precisely at the
requested system time without software involvement.

Co-developed-by: Christopher Hall 
Signed-off-by: Christopher Hall 
Co-developed-by: Pandith N 
Signed-off-by: Pandith N 
Co-developed-by: Thejesh Reddy T R 
Signed-off-by: Thejesh Reddy T R 
Signed-off-by: Lakshmi Sowjanya D 
Reviewed-by: Eddie Dong 
Reviewed-by: Andy Shevchenko 
Acked-by: Rodolfo Giometti 
Signed-off-by: Subramanian Mohan 
Link: https://lore.kernel.org/r/20250219040618.70962-3-subramanian.mohan@intel.com
Signed-off-by: Greg Kroah-Hartman

pps: generators: replace copy of pps-gen info struct with const pointer

2025-02-21T09:46:49+00:00

Some PPS generator drivers may need to retrieve a pointer to their
internal data while executing the PPS generator enable() method.

During the driver registration the pps_gen_device pointer is returned
from the framework, and for that reason, there is difficulty in
getting generator driver data back in the enable function. We won't be
able to use container_of macro as it results in static assert, and we
might end up in using static pointer.

To solve the issue and to get back the generator driver data back, we
should not copy the struct pps_gen_source_info within the struct
pps_gen_device during the registration stage, but simply save the
pointer of the driver one. In this manner, driver may get a pointer
to their internal data as shown below:

struct pps_gen_foo_data_s {
        ...
	struct pps_gen_source_info gen_info;
	struct pps_gen_device *pps_gen;
	...
};

static int __init pps_gen_foo_init(void)
{
        struct pps_gen_foo_data_s *foo;
	...
        foo->pps_gen = pps_gen_register_source(&foo->gen_info);
	...
}

Then, in the enable() method, we can retrieve the pointer to the main
struct by using the code below:

static int pps_gen_foo_enable(struct pps_gen_device *pps_gen, bool enable)
{
        struct pps_gen_foo_data_s *foo = container_of(pps_gen->info,
						struct pps_gen_foo_data_s, gen_info);
        ...
}

Signed-off-by: Rodolfo Giometti 
Tested-by: Subramanian Mohan 
Suggested-by: Andy Shevchenko 
Reviewed-by: Andy Shevchenko 
Signed-off-by: Subramanian Mohan 
Link: https://lore.kernel.org/r/20250219040618.70962-2-subramanian.mohan@intel.com
Signed-off-by: Greg Kroah-Hartman

pps: generators: pps_gen_parport: Switch to use hrtimer_setup()

2025-02-18T10:19:03+00:00

hrtimer_setup() takes the callback function pointer as argument and
initializes the timer completely.

Replace hrtimer_init() and the open coded initialization of
hrtimer::function with the new setup mechanism.

Patch was created by using Coccinelle.

Signed-off-by: Nam Cao 
Signed-off-by: Thomas Gleixner 
Acked-by: Zack Rusin 
Link: https://lore.kernel.org/all/4bf3bb22e21f27c58bb28690d856df913431e693.1738746904.git.namcao@linutronix.de

drivers pps/generators: add dummy PPS generator

2025-01-08T12:18:09+00:00

This dummy PPS generator can be used for debugging and documentation
purposes.

Signed-off-by: Rodolfo Giometti 
Link: https://lore.kernel.org/r/20241108073115.759039-3-giometti@enneenne.com
Signed-off-by: Greg Kroah-Hartman

drivers pps: add PPS generators support

2025-01-08T12:18:09+00:00

Sometimes one needs to be able not only to catch PPS signals but to
produce them also. For example, running a distributed simulation,
which requires computers' clock to be synchronized very tightly.

This patch adds PPS generators class in order to have a well-defined
interface for these devices.

Signed-off-by: Rodolfo Giometti 
Link: https://lore.kernel.org/r/20241108073115.759039-2-giometti@enneenne.com
Signed-off-by: Greg Kroah-Hartman

parport: Remove parport_driver.devmodel

2024-07-03T14:44:22+00:00

'devmodel' hasn't actually been used since:
  'commit 3275158fa52a ("parport: remove use of devmodel")'
and everyone now has it set to true and has been fixed up; remove
the flag.

(There are still comments all over about it)

Signed-off-by: Dr. David Alan Gilbert 
Acked-by: Sudip Mukherjee 
Link: https://lore.kernel.org/r/20240502154823.67235-4-linux@treblig.org
Signed-off-by: Greg Kroah-Hartman