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Convert to use with_info API to simplify the code and to reduce its size.
This patch reduces object file size by approximately 25%.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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The only difference between supported chips is the number of channels.
Drop enum chips and list the number of channels in struct i2c_device_id
directly.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use regmap for caching to simplify the code and to hide read/write
register address differences.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use bit macro to make the code easier to understand and reduce duplication.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Reorder include files to alphabetic order to simplify driver maintenance.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use the device property APIs so the driver does not depend on OF to
work.
While at it, properly include mod_devicetable for struct of_device_id
and fix some parameter alignment in the changed places.
Signed-off-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20240726-dev-hwmon-ltc6947-fw-agnostic-v1-1-f7d6cab7d438@analog.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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By default the PWM duty cycle in hardware is 100%. On some systems this
can cause unwanted fan noise. Add the ability to specify the fan
connections and initial state of the PWMs via device properties.
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20240722221737.3407958-4-chris.packham@alliedtelesis.co.nz
[groeck: Cleaned up formatting]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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MAX6581 supports setting the minimum temperature as well as minimum
temperature alarms. Add support for it.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Convert to with_info hwmon API to simplify the code and reduce its size.
This patch reduces object file size by approximately 25%.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use regmap for register caching, and use regmap API for bit operations
to simplify the code.
This patch reduces object file size by approximately 10%.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use bit operations to improve code maintainability.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Platform data is not used anywhere in the upstram kernel.
Drop support for it to simplify code maintenance.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Reorder include files to alphabetic order to improve maintainability.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Chips reporting overcurrent alarms report it in the second alarm register.
That means the second alarm register has to be read, even if the chip only
supports 8 or fewer ADC channels.
MAX16067 and MAX16068 report undervoltage and overvoltage alarms in
separate registers. Fold register contents together to report both with
the existing alarm attribute. This requires actually storing the chip type
in struct max16065_data. Rename the variable 'chip' to match the variable
name used in the probe function.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Fixes: f5bae2642e3d ("hwmon: Driver for MAX16065 System Manager and compatibles")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Writing large limits resulted in overflows as reported by module tests.
in0_lcrit: Suspected overflow: [max=5538, read 0, written 2147483647]
in0_crit: Suspected overflow: [max=5538, read 0, written 2147483647]
in0_min: Suspected overflow: [max=5538, read 0, written 2147483647]
Fix the problem by clamping prior to multiplications and the use of
DIV_ROUND_CLOSEST, and by using consistent variable types.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Fixes: f5bae2642e3d ("hwmon: Driver for MAX16065 System Manager and compatibles")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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The iterated nodes are direct children of the device node, and the
`device_for_each_child_node()` macro accounts for child node
availability.
`fwnode_for_each_available_child_node()` is meant to access the child
nodes of an fwnode, and therefore not direct child nodes of the device
node.
In this case, the child nodes are not required outside the loop, and
the scoped version of the macro can be used to remove the repetitive
`goto put` pattern.
Use `device_for_each_child_node_scoped_scoped()` to indicate device's
direct child nodes.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://lore.kernel.org/r/20240721-device_for_each_child_node-available-v2-2-f33748fd8b2d@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Add the Dell Latitude 7320 to the fan control whitelist to allow
for manual fan control.
Closes: https://github.com/Wer-Wolf/i8kutils/issues/8
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Acked-by: Pali Rohár <pali@kernel.org>
Link: https://lore.kernel.org/r/20240719203706.19466-1-W_Armin@gmx.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use multi-byte regmap operations to simplify the code
and to reduce dependency on locking.
No functional change.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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LM95233/LM95234 support enabling temperature channels one by one.
Add support for tempX_enable attribute to be able to use that
functionality.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Convert to with_info API to simplify the code and reduce its size.
This patch reduces the object file size by about 30%.
No functional change.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use regmap to replace local caching and to be able to use regmap API
functions.
No functional change.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use find_closest() instead of manually coding it to find best update
interval.
Since find_closest() uses rounding to find the best match, the resulting
update interval will now reflect the update interval that is closest to
the requested value, not the value that is lower or equal to the requested
value.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Alphabetic include file order simplifies maintenance and makes it easier
to add or remove files.
No functional change.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use multi-byte regmap operations where possible to reduce code size.
No functional changes.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use multi-byte regmap operations where possible to reduce code size
and the need for mutex protection.
No functional changes.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use multi-byte regmap operations where possible to reduce code size
and the need for mutex protection.
No functional changes.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use multi-byte regmap operations where possible to reduce code size
and the need for mutex protection.
No functional changes.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use multi-byte regmap operations where possible to reduce code size
and the need for mutex protection.
No functional changes.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use multi-byte regmap operations where possible to reduce code size
and the need for mutex protection.
No functional change.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use multi-byte regmap operations where possible to reduce code size
and the need for mutex protection.
No functional change.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use multi-byte regmap operations where possible to reduce code size
and the need for mutex protection.
No functional change.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Add new PCI device IDs into the root IDs and miscellaneous IDs lists to
provide support for the latest generation of AMD 1Ah family 60h processor
models.
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Link: https://lore.kernel.org/r/20240722092801.3480266-1-Shyam-sundar.S-k@amd.com
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This just standardizes the use of MIN() and MAX() macros, with the very
traditional semantics. The goal is to use these for C constant
expressions and for top-level / static initializers, and so be able to
simplify the min()/max() macros.
These macro names were used by various kernel code - they are very
traditional, after all - and all such users have been fixed up, with a
few different approaches:
- trivial duplicated macro definitions have been removed
Note that 'trivial' here means that it's obviously kernel code that
already included all the major kernel headers, and thus gets the new
generic MIN/MAX macros automatically.
- non-trivial duplicated macro definitions are guarded with #ifndef
This is the "yes, they define their own versions, but no, the include
situation is not entirely obvious, and maybe they don't get the
generic version automatically" case.
- strange use case #1
A couple of drivers decided that the way they want to describe their
versioning is with
#define MAJ 1
#define MIN 2
#define DRV_VERSION __stringify(MAJ) "." __stringify(MIN)
which adds zero value and I just did my Alexander the Great
impersonation, and rewrote that pointless Gordian knot as
#define DRV_VERSION "1.2"
instead.
- strange use case #2
A couple of drivers thought that it's a good idea to have a random
'MIN' or 'MAX' define for a value or index into a table, rather than
the traditional macro that takes arguments.
These values were re-written as C enum's instead. The new
function-line macros only expand when followed by an open
parenthesis, and thus don't clash with enum use.
Happily, there weren't really all that many of these cases, and a lot of
users already had the pattern of using '#ifndef' guarding (or in one
case just using '#undef MIN') before defining their own private version
that does the same thing. I left such cases alone.
Cc: David Laight <David.Laight@aculab.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char / misc and other driver updates from Greg KH:
"Here is the "big" set of char/misc and other driver subsystem changes
for 6.11-rc1. Nothing major in here, just loads of new drivers and
updates. Included in here are:
- IIO api updates and new drivers added
- wait_interruptable_timeout() api cleanups for some drivers
- MODULE_DESCRIPTION() additions for loads of drivers
- parport out-of-bounds fix
- interconnect driver updates and additions
- mhi driver updates and additions
- w1 driver fixes
- binder speedups and fixes
- eeprom driver updates
- coresight driver updates
- counter driver update
- new misc driver additions
- other minor api updates
All of these, EXCEPT for the final Kconfig build fix for 32bit
systems, have been in linux-next for a while with no reported issues.
The Kconfig fixup went in 29 hours ago, so might have missed the
latest linux-next, but was acked by everyone involved"
* tag 'char-misc-6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (330 commits)
misc: Kconfig: exclude mrvl-cn10k-dpi compilation for 32-bit systems
misc: delete Makefile.rej
binder: fix hang of unregistered readers
misc: Kconfig: add a new dependency for MARVELL_CN10K_DPI
virtio: add missing MODULE_DESCRIPTION() macro
agp: uninorth: add missing MODULE_DESCRIPTION() macro
spmi: add missing MODULE_DESCRIPTION() macros
dev/parport: fix the array out-of-bounds risk
samples: configfs: add missing MODULE_DESCRIPTION() macro
misc: mrvl-cn10k-dpi: add Octeon CN10K DPI administrative driver
misc: keba: Fix missing AUXILIARY_BUS dependency
slimbus: Fix struct and documentation alignment in stream.c
MAINTAINERS: CC dri-devel list on Qualcomm FastRPC patches
misc: fastrpc: use coherent pool for untranslated Compute Banks
misc: fastrpc: support complete DMA pool access to the DSP
misc: fastrpc: add missing MODULE_DESCRIPTION() macro
misc: fastrpc: Add missing dev_err newlines
misc: fastrpc: Use memdup_user()
nvmem: core: Implement force_ro sysfs attribute
nvmem: Use sysfs_emit() for type attribute
...
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull misc x86 updates from Borislav Petkov:
- Make error checking of AMD SMN accesses more robust in the callers as
they're the only ones who can interpret the results properly
- The usual cleanups and fixes, left and right
* tag 'x86_misc_for_v6.11_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/kmsan: Fix hook for unaligned accesses
x86/platform/iosf_mbi: Convert PCIBIOS_* return codes to errnos
x86/pci/xen: Fix PCIBIOS_* return code handling
x86/pci/intel_mid_pci: Fix PCIBIOS_* return code handling
x86/of: Return consistent error type from x86_of_pci_irq_enable()
hwmon: (k10temp) Rename _data variable
hwmon: (k10temp) Remove unused HAVE_TDIE() macro
hwmon: (k10temp) Reduce k10temp_get_ccd_support() parameters
hwmon: (k10temp) Define a helper function to read CCD temperature
x86/amd_nb: Enhance SMN access error checking
hwmon: (k10temp) Check return value of amd_smn_read()
EDAC/amd64: Check return value of amd_smn_read()
EDAC/amd64: Remove unused register accesses
tools/x86/kcpuid: Add missing dir via Makefile
x86, arm: Add missing license tag to syscall tables files
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git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging
Pull hwmon updates from Guenter Roeck:
"Obsolete driver removals:
- Removed obsolete adm1021 and max6642 drivers
New drivers:
- MPS MP2891, MP2993, MP9941, and MP5920
- SPD5118 (Temperature Sensor and EEPROM)
Added device support to existing drivers:
- g762: G761
- dell-smm: Dell OptiPlex 7060
- asus-ec-sensors: ProArt X670E-CREATOR WIFI
- corsair-psu: HX1200i Series 2023 psu
- nzxt-smart2: Additional USB IS for NZXT RGB & Fan Controller
Notable enhancements and fixes:
- Removed use of i2c_match_id()
- Constified struct regmap_config where feasible
- Cleaned up amc6821 driver, and converted to use regmap and
with_info API
- Converted max6639 driver to use with_info API; added support for
additional sysfs attributes
- Fixed various sysfs attribute underflows
- Added PEC support to hwmon core, and use in lm90 and max31827
drivers
And various other minor fixes and improvements"
* tag 'hwmon-for-v6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging: (103 commits)
hwmon: (max6697) Fix swapped temp{1,8} critical alarms
hwmon: (max6697) Fix underflow when writing limit attributes
hwmon: Remove obsolete adm1021 and max6642 drivers
hwmon: (pmbus/ltc4286) Drop unused i2c device ids
hwmon: (g762) Initialize fans after configuring clock
hwmon: (amc6821) Add support for pwm1_mode attribute
hwmon: (amc6821) Convert to with_info API
hwmon: (amc6821) Convert to use regmap
hwmon: (amc6821) Drop unnecessary enum chips
hwmon: (amc6821) Use BIT() and GENMASK()
hwmon: (amc6821) Use tabs for column alignment in defines
hwmon: (amc6821) Reorder include files, drop unnecessary ones
hwmon: (amc6821) Add support for fan1_target and pwm1_enable mode 4
hwmon: (amc6821) Rename fan1_div to fan1_pulses
hwmon: (amc6821) Make reading and writing fan speed limits consistent
hwmon: (amc6821) Stop accepting invalid pwm values
hwmon: (w83627ehf) Fix underflows seen when writing limit attributes
hwmon: (nct6775-core) Fix underflows seen when writing limit attributes
hwmon: (lm95234) Fix underflows seen when writing limit attributes
hwmon: (adc128d818) Fix underflows seen when writing limit attributes
...
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git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux
Pull chrome platform updates from Tzung-Bi Shih:
"New code:
- Add "cros_ec_hwmon" driver to expose fan speed and temperature
- Add "cros_charge-control" driver to control charge thresholds and
behaviour
- Add module parameter "log_poll_period_ms" in cros_ec_debugfs for
tuning the poll period
- Support version 3 of EC_CMD_GET_NEXT_EVENT and keyboard matrix
Fixes:
- Fix a race condition in accessing MEC (Microchip EC) memory between
ACPI and kernel. Serialize the memory access by an AML (ACPI
Machine Language) mutex
- Fix an issue of wrong EC message version in cros_ec_debugfs
Misc:
- Fix kernel-doc errors and cleanups"
* tag 'tag-chrome-platform-for-v6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux: (28 commits)
power: supply: cros_charge-control: Fix signedness bug in charge_behaviour_store()
power: supply: cros_charge-control: Avoid accessing attributes out of bounds
power: supply: cros_charge-control: don't load if Framework control is present
power: supply: add ChromeOS EC based charge control driver
platform/chrome: cros_ec_proto: Introduce cros_ec_get_cmd_versions()
platform/chrome: Update binary interface for EC-based charge control
ACPI: battery: add devm_battery_hook_register()
dt-bindings: input: cros-ec-keyboard: Add keyboard matrix v3.0
platform/chrome: cros_ec_lpc: Handle zero length read/write
platform/chrome: cros_ec_lpc: Fix error code in cros_ec_lpc_mec_read_bytes()
platform/chrome: cros_ec_debugfs: fix wrong EC message version
platform/chrome: cros_ec_proto: update Kunit test for get_next_data_v3
platform/chrome: cros_ec_proto: add missing MODULE_DESCRIPTION() macro
hwmon: (cros_ec) Fix access to restricted __le16
hwmon: (cros_ec) Prevent read overflow in probe()
platform/chrome: cros_ec_lpc: Add quirks for Framework Laptop
platform/chrome: cros_ec_lpc: Add a new quirk for AML mutex
platform/chrome: cros_ec_lpc: Add a new quirk for ACPI id
platform/chrome: cros_ec_lpc: MEC access can use an AML mutex
platform/chrome: cros_ec_lpc: MEC access can return error code
...
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The critical alarm bit for the local temperature sensor (temp1) is in
bit 7 of register 0x45 (not bit 6), and the critical alarm bit for remote
temperature sensor 7 (temp8) is in bit 6 (not bit 7).
This only affects MAX6581 since all other chips supported by this driver
do not support those critical alarms.
Fixes: 5372d2d71c46 ("hwmon: Driver for Maxim MAX6697 and compatibles")
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Using DIV_ROUND_CLOSEST() on an unbound value can result in underflows.
Indeed, module test scripts report:
temp1_max: Suspected underflow: [min=0, read 255000, written -9223372036854775808]
temp1_crit: Suspected underflow: [min=0, read 255000, written -9223372036854775808]
Fix by introducing an extra set of clamping.
Fixes: 5372d2d71c46 ("hwmon: Driver for Maxim MAX6697 and compatibles")
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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ADM1021, MAX6642, and compatible chips are supported by the lm90 driver.
Remove the obsolete stand-alone drivers to reduce maintenance overhead.
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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The driver doesn't make use of the different numbers assigned to the
different devices. So drop them.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/9a48ba0368e0c8cddc94c5e4cf3edd7eadc03a2d.1720600141.git.u.kleine-koenig@baylibre.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Adding support for G761 included adding support for an internal clock.
Enabling the internal clock requires setting a bit in the FAN_CMD2
register. This is implemented in g762_fan_init(). However, g762_fan_init()
is called before clock support is selected, and the flag indicating that
the internal clock should be used is not yet set.
Initialize the clock before initializing the fan to solve the problem.
While at it, also add "g7621" to the i2c_device_id array.
Cc: Christian Marangi <ansuelsmth@gmail.com>
Fixes: 6ce402327a6f ("hwmon: g672: add support for g761")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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AMC6821 supports configuring if a fan is DC or PWM controlled.
Add support for the pwm1_mode attribute to make it runtime configurable.
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Convert to use with_info API to simplify the code and make it easier
to maintain. This also reduces code size by approximately 20%.
No functional change intended.
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use regmap for register accesses and caching.
While at it, use sysfs_emit() instead of sprintf() to write sysfs
attribute data, and remove spurious debug messages which would only
be seen as result of a bug in the code. Also make sure that error
codes are propagated and not replaced with -EIO.
While at it, introduce rounding of written temperature values and for
internal calculations to reduce deviation from written values and as
much as possible.
No functional change intended except for differences introduced by
rounding.
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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The driver only supports a single chip, so an enum
to determine the chip type is unnecessary. Drop it.
No functional change intended.
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Use BIT() and GENMASK() for bit and mask definitions
to help distinguish bit and mask definitions from other
defines and to make the code easier to read.
No functional change intended.
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Using tabs for column alignment makes the code easier to read.
No functional change intended.
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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Reorder include files to alphabetic order to simplify maintenance,
and drop the unnecessary kernel.h include.
No functional change intended.
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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After setting fan1_target and setting pwm1_enable to 4,
the fan controller tries to achieve the requested fan speed.
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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