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linux/drivers/leds
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Marek Behún 6de283b96b leds: turris-omnia: Do not use SMBUS calls 
The leds-turris-omnia driver uses three function for I2C access:
- i2c_smbus_write_byte_data() and i2c_smbus_read_byte_data(), which
  cause an emulated SMBUS transfer,
- i2c_master_send(), which causes an ordinary I2C transfer.

The Turris Omnia MCU LED controller is not semantically SMBUS, it
operates as a simple I2C bus. It does not implement any of the SMBUS
specific features, like PEC, or procedure calls, or anything. Moreover
the I2C controller driver also does not implement SMBUS, and so the
emulated SMBUS procedure from drivers/i2c/i2c-core-smbus.c is used for
the SMBUS calls, which gives an unnecessary overhead.

When I first wrote the driver, I was unaware of these facts, and I
simply used the first function that worked.

Drop the I2C SMBUS calls and instead use simple I2C transfers.

Fixes: 089381b27a ("leds: initial support for Turris Omnia LEDs")
Signed-off-by: Marek Behún <kabel@kernel.org>
Link: https://lore.kernel.org/r/20230918161104.20860-2-kabel@kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>
2023-11-01 11:28:43 +00:00
..
blink leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
flash leds: mt6370: Annotate struct mt6370_priv with __counted_by 2023-11-01 11:28:41 +00:00
rgb leds: mt6370: Annotate struct mt6370_priv with __counted_by 2023-11-01 11:28:41 +00:00
simple leds: simatic-ipc-leds-gpio: Convert to platform remove callback returning void 2023-11-01 11:28:33 +00:00
trigger - Core Frameworks 2023-09-04 13:52:58 -07:00
Kconfig leds: pca995x: Add support for PCA995X chips 2023-07-28 09:26:28 +01:00
led-class-flash.c led-class-flash: fix -Wrestrict warning 2021-09-27 16:09:42 +02:00
led-class-multicolor.c leds: multicolor: Use rounded division when calculating color components 2023-08-17 11:25:03 +01:00
led-class.c leds: Make leds_class a static const structure 2023-08-18 08:43:11 +01:00
led-core.c leds: Fix BUG_ON check for LED_COLOR_ID_MULTI that is always false 2023-08-17 11:26:36 +01:00
led-triggers.c leds: Clear LED_INIT_DEFAULT_TRIGGER when clearing current trigger 2023-05-25 12:16:33 +01:00
leds-88pm860x.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-acer-a500.c leds: Add driver for Acer Iconia Tab A500 2020-09-26 21:56:42 +02:00
leds-adp5520.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-an30259a.c leds: Remove redundant of_match_ptr() 2023-08-17 13:28:25 +01:00
leds-apu.c leds: apu: extend support for PC Engines APU1 with newer firmware 2021-02-19 22:15:10 +01:00
leds-ariel.c leds: Explicitly include correct DT includes 2023-07-28 10:02:32 +01:00
leds-aw200xx.c leds: aw200xx: Annotate struct aw200xx with __counted_by 2023-11-01 11:28:25 +00:00
leds-aw2013.c leds: aw2013: Enable pull-up supply for interrupt and I2C 2023-08-18 16:47:21 +01:00
leds-bcm6328.c leds: bcm6328: Get rid of custom led_init_default_state_get() 2023-01-30 08:03:37 +00:00
leds-bcm6358.c leds: bcm6358: Get rid of custom led_init_default_state_get() 2023-01-30 08:03:38 +00:00
leds-bd2606mvv.c leds: Switch i2c drivers back to use .probe() 2023-05-25 12:16:22 +01:00
leds-bd2802.c leds: Switch i2c drivers back to use .probe() 2023-05-25 12:16:22 +01:00
leds-blinkm.c leds: blinkm: Replace all non-returning strlcpy with strscpy 2023-05-25 12:31:18 +01:00
leds-cht-wcove.c leds: cht-wcove: Remove unneeded semicolon 2023-06-08 18:11:14 +01:00
leds-clevo-mail.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-cobalt-qube.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
leds-cobalt-raq.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 1 2019-05-21 11:28:39 +02:00
leds-cpcap.c leds: Explicitly include correct DT includes 2023-07-28 10:02:32 +01:00
leds-cr0014114.c leds: cr0014114: Annotate struct cr0014114 with __counted_by 2023-11-01 11:28:26 +00:00
leds-da903x.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-da9052.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-dac124s085.c spi: make remove callback a void function 2022-02-09 13:00:45 +00:00
leds-el15203000.c leds: el15203000: Annotate struct el15203000 with __counted_by 2023-11-01 11:28:28 +00:00
leds-gpio-register.c leds: leds-gpio-register: Supply description for param 'id' 2021-05-28 11:38:54 +02:00
leds-gpio.c leds: gpio: Annotate struct gpio_leds_priv with __counted_by 2023-11-01 11:28:29 +00:00
leds-hp6xx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
leds-ip30.c leds: ip30: Convert to devm_platform_ioremap_resource() 2023-07-28 09:26:21 +01:00
leds-ipaq-micro.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
leds-is31fl32xx.c leds: Explicitly include correct DT includes 2023-07-28 10:02:32 +01:00
leds-is31fl319x.c leds: Switch i2c drivers back to use .probe() 2023-05-25 12:16:22 +01:00
leds-lm355x.c leds: Switch i2c drivers back to use .probe() 2023-05-25 12:16:22 +01:00
leds-lm3530.c leds: Switch i2c drivers back to use .probe() 2023-05-25 12:16:22 +01:00
leds-lm3532.c leds: Switch i2c drivers back to use .probe() 2023-05-25 12:16:22 +01:00
leds-lm3533.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-lm3642.c leds: Switch i2c drivers back to use .probe() 2023-05-25 12:16:22 +01:00
leds-lm3692x.c leds: Switch i2c drivers back to use .probe() 2023-05-25 12:16:22 +01:00
leds-lm3697.c leds: lm3697: Annotate struct lm3697 with __counted_by 2023-11-01 11:28:31 +00:00
leds-lm36274.c leds: lm36274: Add missed property.h 2021-05-30 23:03:48 +02:00
leds-locomo.c ARM: pxa: split up mach/hardware.h 2022-04-19 16:27:05 +02:00
leds-lp50xx.c leds: Switch i2c drivers back to use .probe() 2023-05-25 12:16:22 +01:00
leds-lp55xx-common.c leds: lp55xx: Use gpiod_set_value_cansleep() 2023-11-01 11:28:42 +00:00
leds-lp55xx-common.h leds: lp55xx: Add multicolor framework support to lp55xx 2020-07-22 14:42:06 +02:00
leds-lp3944.c leds: Switch i2c drivers back to use .probe() 2023-05-25 12:16:22 +01:00
leds-lp3952.c leds: Switch i2c drivers back to use .probe() 2023-05-25 12:16:22 +01:00
leds-lp5521.c leds: Remove redundant of_match_ptr() 2023-08-17 13:28:25 +01:00
leds-lp5523.c leds: Remove redundant of_match_ptr() 2023-08-17 13:28:25 +01:00
leds-lp5562.c leds: Remove redundant of_match_ptr() 2023-08-17 13:28:25 +01:00
leds-lp8501.c leds: Remove redundant of_match_ptr() 2023-08-17 13:28:25 +01:00
leds-lp8788.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
leds-lp8860.c leds: Switch i2c drivers back to use .probe() 2023-05-25 12:16:22 +01:00
leds-lt3593.c leds: lt3593: Put fwnode in any case during ->probe() 2021-08-03 23:49:31 +02:00
leds-max8997.c leds: max8997: Don't error if there is no pdata 2022-10-22 11:55:03 +02:00
leds-max77650.c leds: parse linux,default-trigger DT property in LED core 2020-09-26 21:56:43 +02:00
leds-mc13783.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-menf21bmc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
leds-mlxcpld.c leds: leds-mlxcpld: Fix a bunch of kernel-doc formatting issues 2021-05-28 11:39:00 +02:00
leds-mlxreg.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-mt6323.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-net48xx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
leds-netxbig.c leds: Use DEVICE_ATTR_{RW, RO, WO} macros 2020-12-30 19:37:13 +01:00
leds-nic78bx.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-ns2.c leds: ns2: Slightly simplify a memory allocation 2023-07-28 11:58:04 +01:00
leds-ot200.c
leds-pca955x.c leds: pca955x: Fix -Wvoid-pointer-to-enum-cast warning 2023-11-01 11:28:24 +00:00
leds-pca963x.c leds: Switch i2c drivers back to use .probe() 2023-05-25 12:16:22 +01:00
leds-pca995x.c leds: pca995x: Fix MODULE_DEVICE_TABLE for OF 2023-08-15 18:30:07 +01:00
leds-pca9532.c leds: Explicitly include correct DT includes 2023-07-28 10:02:32 +01:00
leds-pm8058.c leds: Explicitly include correct DT includes 2023-07-28 10:02:32 +01:00
leds-powernv.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-pwm.c leds: Explicitly include correct DT includes 2023-07-28 10:02:32 +01:00
leds-rb532.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-regulator.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-sc27xx-bltc.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-spi-byte.c leds: Explicitly include correct DT includes 2023-07-28 10:02:32 +01:00
leds-ss4200.c leds: ss4200: simplify the return expression of register_nasgpio_led() 2020-12-30 19:37:14 +01:00
leds-sunfire.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-syscon.c leds: Explicitly include correct DT includes 2023-07-28 10:02:32 +01:00
leds-tca6507.c leds: Switch i2c drivers back to use .probe() 2023-05-25 12:16:22 +01:00
leds-ti-lmu-common.c leds: Explicitly include correct DT includes 2023-07-28 10:02:32 +01:00
leds-tlc591xx.c leds: Explicitly include correct DT includes 2023-07-28 10:02:32 +01:00
leds-tps6105x.c leds: tps6105x: add driver for MFD chip LED mode 2019-12-21 20:10:02 +01:00
leds-turris-omnia.c leds: turris-omnia: Do not use SMBUS calls 2023-11-01 11:28:43 +00:00
leds-wm831x-status.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-wm8350.c leds: Convert all platform drivers to return void 2023-11-01 11:28:35 +00:00
leds-wrap.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
leds.h leds: Move led_init_default_state_get() to the global header 2023-01-30 08:03:35 +00:00
Makefile leds: pca995x: Add support for PCA995X chips 2023-07-28 09:26:28 +01:00
TODO leds: TODO: Add documentation about possible subsystem improvements 2020-09-30 19:15:33 +02:00
uleds.c leds: uleds: Use module_misc_device macro to simplify the code 2023-08-18 11:42:54 +01:00