CVS log for src/sys/dev/ic/pcf8584.c

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Default branch: MAIN

Remove unnecessary include of <sys/malloc.h>.

- Improve some comments.
- Update pcfiic_i2c_exec() for the channel split (might fix an issue
  spotted by tnn@ in testing).

Port over the changes from thorpej-i2c-spi-conf to thorpej-i2c-spi-conf2,
which is based on a newer HEAD revision.

Merge thorpej-cfargs2.

Adapt to CFARGS().

Update the pcfiic driver for the new i2c device enumeration scheme.
Push the multiple-channels complexity up into the ebus front-end,
as that specific to a particular Sun model of controller.  Now
the BBC-type controllers get multiple I2C bus instances attached to
them.

Merge thorpej-cfargs branch:

Simplify and make extensible the config_search() / config_found() /
config_attach() interfaces: rather than having different variants for
which arguments you want pass along, just have a single call that
takes a variadic list of tag-value arguments.

Adjust all call sites:
- Simplify wherever possible; don't pass along arguments that aren't
  actually needed.
- Don't be explicit about what interface attribute is attaching if
  the device only has one.  (More simplification.)
- Add a config_probe() function to be used in indirect configuiration
  situations, making is visibly easier to see when indirect config is
  in play, and allowing for future change in semantics.  (As of now,
  this is just a wrapper around config_match(), but that is an
  implementation detail.)

Remove unnecessary or redundant interface attributes where they're not
needed.

There are currently 5 "cfargs" defined:
- CFARG_SUBMATCH (submatch function for direct config)
- CFARG_SEARCH (search function for indirect config)
- CFARG_IATTR (interface attribte)
- CFARG_LOCATORS (locators array)
- CFARG_DEVHANDLE (devhandle_t - wraps OFW, ACPI, etc. handles)

...and a sentinel value CFARG_EOL.

Add some extra sanity checking to ensure that interface attributes
aren't ambiguous.

Use CFARG_DEVHANDLE in MI FDT, OFW, and ACPI code, and macppc and shark
ports to associate those device handles with device_t instance.  This
will trickle trough to more places over time (need back-end for pre-OFW
Sun OBP; any others?).

Give config_found() the same variadic arguments treatment as
config_search().  This commit only adds the CFARG_EOL sentinel
to the existing config_found() calls.  Conversion of config_found_sm_loc()
and config_found_ia() call sites will be in subsequent commits.

Merge changes from current as of 20200406

pcfiic_i2c_exec(): No need to check 'cold' to force I2C_F_POLL; the i2c
upper layer does it for us.

Cleanup i2c bus acquire / release, centralizing all of the logic into
iic_acquire_bus() / iic_release_bus().  "acquire" and "release" hooks
no longer need to be provided by back-end controller drivers (only if
they need special handling, e.g. powering on the i2c controller).
This results in the removal of a bunch of rendundant code from each
back-end controller driver.

Assert that we are not in hard interrupt context in iic_acquire_bus(),
iic_exec(), and iic_release_bus().

update from HEAD

Sync with HEAD

Always take the bus lock (avoids collisions when drivers set I2C_F_POLL).

Redo r1.12 - process cmd and value buffers in pcfiic_xmit().
Avoids allocating a temporary buffer for writes using both buffers.

Remove duplicate register definitions and merge them all into pcf8584reg.h.
No functional change.

Sync with HEAD (as of 26th Dec)

Allow pcfiic to handle i2c writes using cmdbuf for the register, and buf for
the value to be written.  Prior to this, we would send an empty write command
to the correct i2c address, plus an empty write command to the device at the
i2c address of the first byte of buf.

Rebase to HEAD as of a few days ago.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs.  ("Protocol error: too many arguments")

sync with head

Remove the check for (cmdlen > 0) when writing.  When i2cscan sends a
quick_write, the command length is 0, so we were previously returning
success for every address in this case.

Remove unused variable

sync with head.

sync with head

Sync with HEAD.

#include <sys/bus.h> instead of <machine/bus.h>.  No functional change
intended.

remove a now useless bus_space_barrier()

Do as OpenSolaris does and read the status register after each write.
Now this driver works on my Blade 2500.

sync with head

Update pcf8584 driver from OpenBSD

Sync with HEAD.

sync with head.

sync with head.

Remove clause 3 and 4 from TNF licenses

use aprint_*_dev and device_xname

Sync with HEAD.

convert pcf8584 to device_t.

sync with HEAD

sync with head.

Sync with HEAD.

Follow the merge of pmap.c on i386 and amd64 and move
pmap_init_tmp_pgtbl into arch/x86/x86/pmap.c. Modify the ACPI wakeup
code to restore CR4 before jumping back into kernel space as the large
page option might cover that.

Sync with HEAD.

Sync with head.

machine/{bus,cpu,intr}.h -> sys/{bus,cpu,intr}.h

sync with head.

Sync with head.

Sync with head.

sync with head.

file pcf8584.c was added on branch yamt-lazymbuf on 2007-09-03 14:35:04 +0000

file pcf8584.c was added on branch mjf-ufs-trans on 2007-07-11 20:06:05 +0000

file pcf8584.c was added on branch vmlocking on 2007-06-09 21:37:16 +0000

file pcf8584.c was added on branch yamt-idlelwp on 2007-04-15 16:03:22 +0000

Add envctrl(4): Sun Ultra Enterprise 450 environmental monitoring driver.
Also add accompanying i2c controller driver, pcf8584.
Both written by me. Some cosmetic improvements from Iain Hibbert.
ok <martin>