linux-stable.git/include/linux/i2c.h, branch v5.4.285

i2c: Use IS_REACHABLE() for substituting empty ACPI functions

2024-09-12T09:03:50+00:00

commit 71833e79a42178d8a50b5081c98c78ace9325628 upstream.

Replace IS_ENABLED() with IS_REACHABLE() to substitute empty stubs for:
    i2c_acpi_get_i2c_resource()
    i2c_acpi_client_count()
    i2c_acpi_find_bus_speed()
    i2c_acpi_new_device_by_fwnode()
    i2c_adapter *i2c_acpi_find_adapter_by_handle()
    i2c_acpi_waive_d0_probe()

commit f17c06c6608a ("i2c: Fix conditional for substituting empty ACPI
functions") partially fixed this conditional to depend on CONFIG_I2C,
but used IS_ENABLED(), which is wrong since CONFIG_I2C is tristate.

CONFIG_ACPI is boolean but let's also change it to use IS_REACHABLE()
to future-proof it against becoming tristate.

Somehow despite testing various combinations of CONFIG_I2C and CONFIG_ACPI
we missed the combination CONFIG_I2C=m, CONFIG_ACPI=y.

Signed-off-by: Richard Fitzgerald 
Fixes: f17c06c6608a ("i2c: Fix conditional for substituting empty ACPI functions")
Reported-by: kernel test robot 
Closes: https://lore.kernel.org/oe-kbuild-all/202408141333.gYnaitcV-lkp@intel.com/
Reviewed-by: Takashi Iwai 
Signed-off-by: Wolfram Sang 
Signed-off-by: Greg Kroah-Hartman

i2c: Fix conditional for substituting empty ACPI functions

2024-09-12T09:03:49+00:00

[ Upstream commit f17c06c6608ad4ecd2ccf321753fb511812d821b ]

Add IS_ENABLED(CONFIG_I2C) to the conditional around a bunch of ACPI
functions.

The conditional around these functions depended only on CONFIG_ACPI.
But the functions are implemented in I2C core, so are only present if
CONFIG_I2C is enabled.

Signed-off-by: Richard Fitzgerald 
Signed-off-by: Wolfram Sang 
Signed-off-by: Sasha Levin

i2c: Add I2C_AQ_NO_REP_START adapter quirk

2021-05-19T08:08:22+00:00

[ Upstream commit aca01415e076aa96cca0f801f4420ee5c10c660d ]

This quirk signifies that the adapter cannot do a repeated
START, it always issues a STOP condition after transfers.

Suggested-by: Wolfram Sang 
Signed-off-by: Bence Csókás 
Signed-off-by: Wolfram Sang 
Signed-off-by: Sasha Levin

Merge branch 'i2c/for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

2019-09-24T23:48:02+00:00

Pull i2c updates from Wolfram Sang:

 - new driver for ICY, an Amiga Zorro card :)

 - axxia driver gained slave mode support, NXP driver gained ACPI

 - the slave EEPROM backend gained 16 bit address support

 - and lots of regular driver updates and reworks

* 'i2c/for-5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (52 commits)
  i2c: tegra: Move suspend handling to NOIRQ phase
  i2c: imx: ACPI support for NXP i2c controller
  i2c: uniphier(-f): remove all dev_dbg()
  i2c: uniphier(-f): use devm_platform_ioremap_resource()
  i2c: slave-eeprom: Add comment about address handling
  i2c: exynos5: Remove IRQF_ONESHOT
  i2c: stm32f7: Make structure stm32f7_i2c_algo constant
  i2c: cht-wc: drop check because i2c_unregister_device() is NULL safe
  i2c-eeprom_slave: Add support for more eeprom models
  i2c: fsi: Add of_put_node() before break
  i2c: synquacer: Make synquacer_i2c_ops constant
  i2c: hix5hd2: Remove IRQF_ONESHOT
  i2c: i801: Use iTCO version 6 in Cannon Lake PCH and beyond
  watchdog: iTCO: Add support for Cannon Lake PCH iTCO
  i2c: iproc: Make bcm_iproc_i2c_quirks constant
  i2c: iproc: Add full name of devicetree node to adapter name
  i2c: piix4: Add ACPI support
  i2c: piix4: Fix probing of reserved ports on AMD Family 16h Model 30h
  i2c: ocores: use request_any_context_irq() to register IRQ handler
  i2c: designware: Fix optional reset error handling
  ...

i2c: replace i2c_new_secondary_device with an ERR_PTR variant

2019-08-14T12:54:55+00:00

In the general move to have i2c_new_*_device functions which return
ERR_PTR instead of NULL, this patch converts i2c_new_secondary_device().

There are only few users, so this patch converts the I2C core and all
users in one go. The function gets renamed to i2c_new_ancillary_device()
so out-of-tree users will get a build failure to understand they need to
adapt their error checking code.

Signed-off-by: Wolfram Sang 
Reviewed-by: Kieran Bingham  # adv748x
Reviewed-by: Laurent Pinchart  # adv7511 + adv7604
Reviewed-by: Hans Verkuil  # adv7604
Signed-off-by: Wolfram Sang

docs: i2c: convert to ReST and add to driver-api bookset

2019-07-31T19:25:27+00:00

Convert each file at I2C subsystem, renaming them to .rst and
adding to the driver-api book.

Signed-off-by: Mauro Carvalho Chehab 
Acked-by: Wolfram Sang 
Acked-by: Alexandre Belloni 
Acked-by: Jonathan Cameron 
Signed-off-by: Jonathan Corbet

i2c: add newly exported functions to the header, too

2019-06-26T13:10:35+00:00

Nobody (including me) noticed that these functions were exported but not
added to the header :/

Fixes: 7159dbdae3c5 ("i2c: core: improve return value handling of i2c_new_device and i2c_new_dummy")
Signed-off-by: Wolfram Sang 
Reviewed-by: Bartosz Golaszewski 
Reviewed-by: Kieran Bingham 
Signed-off-by: Wolfram Sang

i2c: headers: reformat header comment and update copyright

2019-06-14T21:24:33+00:00

Let's stick to coding style.

Signed-off-by: Wolfram Sang

i2c: headers: update docs about I2C_CLIENT_*

2019-06-14T21:24:33+00:00

Update kerneldoc for i2c client flags because they increased over time.
Also, move them to a position where they can be more easily found.

Signed-off-by: Wolfram Sang

i2c: headers: always have a named variable in arguments

2019-06-14T21:24:33+00:00

Much better to read and understand. Naming for i2c_adapter is not
consistent (yet), so use the name which is also used in core code.

Signed-off-by: Wolfram Sang