These modules need to depend on iic, not just on i2cexec. (They will
still recursively get i2cexec since the iic depends on it.)

Partial fix for kern/56772

avoid double-free

branches: 1.13.4;
Use DEVICE_COMPAT_EOL.

Since we're using designated initialisers for compat data, we should
use a completely empty initializer for the sentinel.

Use designated initializers and a consistent termination style in
compat_data[].

Make sure that we set sc->sc_sme to NULL in failure cases in order to avoid
calling sysmon_envsys_unregister() with an invalid struct when we detach.

branches: 1.9.8;
enable FDT direct configuration.
remove address test as the i2c address can be changed on this device.

branches: 1.8.2;
More cleanup to i2c autoconfiguration:

- Get all of the drivers onto the new match quality constants.
- Introduce a new helper function, iic_use_direct_match(), that has
all of the logic for direct-config matching. If it returns true,
the driver returns the match result (which may be 0). If it returns
false, the driver does indirect-config matching.
- iic_compat_match() now returns a weighted match quality; matches to
lower-indexed "compatible" device property are more-specific matches,
and return a better match quality accordingly.

XXX This driver is an odd-ball with respect to the hardware device.
See comments in the match routine. Unclear how best to handle it.

branches: 1.7.16;
convert device polling from callout to kthread.
Solves:
- hung initialization on A20 (bananapi)
- allows iic_exec() implementations to use condvars

Declare sensor data invalid when reading the sensor failed (device is gone).

Tests showed that the sensor needs at least 30ms after a MR (measurement
request) to have valid data ready, so the driver didn't work very well.
Now the MR is sent in configurable intervals (hw.hythygtemp0.interval)
using callout(9), so that valid data is immediately available for
sysmon's sensor refresh. When the refresh comes too close after the last
MR, then the previous values are used.

Update module dependencies for all the existing modules that depend on sysmon components.

i2c devices don't actually have a dependency on "iic" (the bus driver)
but on "i2cexec". Create an i2cexec module (i2c_exec.c) to mirror the
dependencies in files.i2c and switch device drivers to depend on "i2cexec"
module instead.

A kernel with a USB stack and no I2C controller / bus attachment would spit
out a bunch of "WARNING: module error: can't find builtin dependency `iic'"
messages at boot. This change solves that problem.

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.8;
allow i2c address 0x01-0x7F
ignore responses if the sensor is in command mode

branches: 1.1.2;
add HYT-221/271/939 humidity/temperature I2C sensor
extend envsys(4) framework by %rH (relative humidity)

avoid double-free

Use DEVICE_COMPAT_EOL.

Since we're using designated initialisers for compat data, we should
use a completely empty initializer for the sentinel.

Use designated initializers and a consistent termination style in
compat_data[].

Make sure that we set sc->sc_sme to NULL in failure cases in order to avoid
calling sysmon_envsys_unregister() with an invalid struct when we detach.

branches: 1.9.8;
enable FDT direct configuration.
remove address test as the i2c address can be changed on this device.

branches: 1.8.2;
More cleanup to i2c autoconfiguration:

- Get all of the drivers onto the new match quality constants.
- Introduce a new helper function, iic_use_direct_match(), that has
all of the logic for direct-config matching. If it returns true,
the driver returns the match result (which may be 0). If it returns
false, the driver does indirect-config matching.
- iic_compat_match() now returns a weighted match quality; matches to
lower-indexed "compatible" device property are more-specific matches,
and return a better match quality accordingly.

XXX This driver is an odd-ball with respect to the hardware device.
See comments in the match routine. Unclear how best to handle it.

branches: 1.7.16;
convert device polling from callout to kthread.
Solves:
- hung initialization on A20 (bananapi)
- allows iic_exec() implementations to use condvars

Declare sensor data invalid when reading the sensor failed (device is gone).

Tests showed that the sensor needs at least 30ms after a MR (measurement
request) to have valid data ready, so the driver didn't work very well.
Now the MR is sent in configurable intervals (hw.hythygtemp0.interval)
using callout(9), so that valid data is immediately available for
sysmon's sensor refresh. When the refresh comes too close after the last
MR, then the previous values are used.

Update module dependencies for all the existing modules that depend on sysmon components.

i2c devices don't actually have a dependency on "iic" (the bus driver)
but on "i2cexec". Create an i2cexec module (i2c_exec.c) to mirror the
dependencies in files.i2c and switch device drivers to depend on "i2cexec"
module instead.

A kernel with a USB stack and no I2C controller / bus attachment would spit
out a bunch of "WARNING: module error: can't find builtin dependency `iic'"
messages at boot. This change solves that problem.

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.8;
allow i2c address 0x01-0x7F
ignore responses if the sensor is in command mode

branches: 1.1.2;
add HYT-221/271/939 humidity/temperature I2C sensor
extend envsys(4) framework by %rH (relative humidity)

Use DEVICE_COMPAT_EOL.

Since we're using designated initialisers for compat data, we should
use a completely empty initializer for the sentinel.

Use designated initializers and a consistent termination style in
compat_data[].

Make sure that we set sc->sc_sme to NULL in failure cases in order to avoid
calling sysmon_envsys_unregister() with an invalid struct when we detach.

branches: 1.9.8;
enable FDT direct configuration.
remove address test as the i2c address can be changed on this device.

branches: 1.8.2;
More cleanup to i2c autoconfiguration:

- Get all of the drivers onto the new match quality constants.
- Introduce a new helper function, iic_use_direct_match(), that has
all of the logic for direct-config matching. If it returns true,
the driver returns the match result (which may be 0). If it returns
false, the driver does indirect-config matching.
- iic_compat_match() now returns a weighted match quality; matches to
lower-indexed "compatible" device property are more-specific matches,
and return a better match quality accordingly.

XXX This driver is an odd-ball with respect to the hardware device.
See comments in the match routine. Unclear how best to handle it.

branches: 1.7.16;
convert device polling from callout to kthread.
Solves:
- hung initialization on A20 (bananapi)
- allows iic_exec() implementations to use condvars

Declare sensor data invalid when reading the sensor failed (device is gone).

Tests showed that the sensor needs at least 30ms after a MR (measurement
request) to have valid data ready, so the driver didn't work very well.
Now the MR is sent in configurable intervals (hw.hythygtemp0.interval)
using callout(9), so that valid data is immediately available for
sysmon's sensor refresh. When the refresh comes too close after the last
MR, then the previous values are used.

Update module dependencies for all the existing modules that depend on sysmon components.

i2c devices don't actually have a dependency on "iic" (the bus driver)
but on "i2cexec". Create an i2cexec module (i2c_exec.c) to mirror the
dependencies in files.i2c and switch device drivers to depend on "i2cexec"
module instead.

A kernel with a USB stack and no I2C controller / bus attachment would spit
out a bunch of "WARNING: module error: can't find builtin dependency `iic'"
messages at boot. This change solves that problem.

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.8;
allow i2c address 0x01-0x7F
ignore responses if the sensor is in command mode

branches: 1.1.2;
add HYT-221/271/939 humidity/temperature I2C sensor
extend envsys(4) framework by %rH (relative humidity)

Since we're using designated initialisers for compat data, we should
use a completely empty initializer for the sentinel.

Use designated initializers and a consistent termination style in
compat_data[].

Make sure that we set sc->sc_sme to NULL in failure cases in order to avoid
calling sysmon_envsys_unregister() with an invalid struct when we detach.

branches: 1.9.8;
enable FDT direct configuration.
remove address test as the i2c address can be changed on this device.

branches: 1.8.2;
More cleanup to i2c autoconfiguration:

- Get all of the drivers onto the new match quality constants.
- Introduce a new helper function, iic_use_direct_match(), that has
all of the logic for direct-config matching. If it returns true,
the driver returns the match result (which may be 0). If it returns
false, the driver does indirect-config matching.
- iic_compat_match() now returns a weighted match quality; matches to
lower-indexed "compatible" device property are more-specific matches,
and return a better match quality accordingly.

XXX This driver is an odd-ball with respect to the hardware device.
See comments in the match routine. Unclear how best to handle it.

branches: 1.7.16;
convert device polling from callout to kthread.
Solves:
- hung initialization on A20 (bananapi)
- allows iic_exec() implementations to use condvars

Declare sensor data invalid when reading the sensor failed (device is gone).

Tests showed that the sensor needs at least 30ms after a MR (measurement
request) to have valid data ready, so the driver didn't work very well.
Now the MR is sent in configurable intervals (hw.hythygtemp0.interval)
using callout(9), so that valid data is immediately available for
sysmon's sensor refresh. When the refresh comes too close after the last
MR, then the previous values are used.

Update module dependencies for all the existing modules that depend on sysmon components.

i2c devices don't actually have a dependency on "iic" (the bus driver)
but on "i2cexec". Create an i2cexec module (i2c_exec.c) to mirror the
dependencies in files.i2c and switch device drivers to depend on "i2cexec"
module instead.

A kernel with a USB stack and no I2C controller / bus attachment would spit
out a bunch of "WARNING: module error: can't find builtin dependency `iic'"
messages at boot. This change solves that problem.

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.8;
allow i2c address 0x01-0x7F
ignore responses if the sensor is in command mode

branches: 1.1.2;
add HYT-221/271/939 humidity/temperature I2C sensor
extend envsys(4) framework by %rH (relative humidity)

Use designated initializers and a consistent termination style in
compat_data[].

Make sure that we set sc->sc_sme to NULL in failure cases in order to avoid
calling sysmon_envsys_unregister() with an invalid struct when we detach.

branches: 1.9.8;
enable FDT direct configuration.
remove address test as the i2c address can be changed on this device.

branches: 1.8.2;
More cleanup to i2c autoconfiguration:

- Get all of the drivers onto the new match quality constants.
- Introduce a new helper function, iic_use_direct_match(), that has
all of the logic for direct-config matching. If it returns true,
the driver returns the match result (which may be 0). If it returns
false, the driver does indirect-config matching.
- iic_compat_match() now returns a weighted match quality; matches to
lower-indexed "compatible" device property are more-specific matches,
and return a better match quality accordingly.

XXX This driver is an odd-ball with respect to the hardware device.
See comments in the match routine. Unclear how best to handle it.

branches: 1.7.16;
convert device polling from callout to kthread.
Solves:
- hung initialization on A20 (bananapi)
- allows iic_exec() implementations to use condvars

Declare sensor data invalid when reading the sensor failed (device is gone).

Tests showed that the sensor needs at least 30ms after a MR (measurement
request) to have valid data ready, so the driver didn't work very well.
Now the MR is sent in configurable intervals (hw.hythygtemp0.interval)
using callout(9), so that valid data is immediately available for
sysmon's sensor refresh. When the refresh comes too close after the last
MR, then the previous values are used.

Update module dependencies for all the existing modules that depend on sysmon components.

i2c devices don't actually have a dependency on "iic" (the bus driver)
but on "i2cexec". Create an i2cexec module (i2c_exec.c) to mirror the
dependencies in files.i2c and switch device drivers to depend on "i2cexec"
module instead.

A kernel with a USB stack and no I2C controller / bus attachment would spit
out a bunch of "WARNING: module error: can't find builtin dependency `iic'"
messages at boot. This change solves that problem.

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.8;
allow i2c address 0x01-0x7F
ignore responses if the sensor is in command mode

branches: 1.1.2;
add HYT-221/271/939 humidity/temperature I2C sensor
extend envsys(4) framework by %rH (relative humidity)

Make sure that we set sc->sc_sme to NULL in failure cases in order to avoid
calling sysmon_envsys_unregister() with an invalid struct when we detach.

enable FDT direct configuration.
remove address test as the i2c address can be changed on this device.

branches: 1.8.2;
More cleanup to i2c autoconfiguration:

- Get all of the drivers onto the new match quality constants.
- Introduce a new helper function, iic_use_direct_match(), that has
all of the logic for direct-config matching. If it returns true,
the driver returns the match result (which may be 0). If it returns
false, the driver does indirect-config matching.
- iic_compat_match() now returns a weighted match quality; matches to
lower-indexed "compatible" device property are more-specific matches,
and return a better match quality accordingly.

XXX This driver is an odd-ball with respect to the hardware device.
See comments in the match routine. Unclear how best to handle it.

branches: 1.7.16;
convert device polling from callout to kthread.
Solves:
- hung initialization on A20 (bananapi)
- allows iic_exec() implementations to use condvars

Declare sensor data invalid when reading the sensor failed (device is gone).

Tests showed that the sensor needs at least 30ms after a MR (measurement
request) to have valid data ready, so the driver didn't work very well.
Now the MR is sent in configurable intervals (hw.hythygtemp0.interval)
using callout(9), so that valid data is immediately available for
sysmon's sensor refresh. When the refresh comes too close after the last
MR, then the previous values are used.

Update module dependencies for all the existing modules that depend on sysmon components.

i2c devices don't actually have a dependency on "iic" (the bus driver)
but on "i2cexec". Create an i2cexec module (i2c_exec.c) to mirror the
dependencies in files.i2c and switch device drivers to depend on "i2cexec"
module instead.

A kernel with a USB stack and no I2C controller / bus attachment would spit
out a bunch of "WARNING: module error: can't find builtin dependency `iic'"
messages at boot. This change solves that problem.

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.8;
allow i2c address 0x01-0x7F
ignore responses if the sensor is in command mode

branches: 1.1.2;
add HYT-221/271/939 humidity/temperature I2C sensor
extend envsys(4) framework by %rH (relative humidity)

enable FDT direct configuration.
remove address test as the i2c address can be changed on this device.

More cleanup to i2c autoconfiguration:

- Get all of the drivers onto the new match quality constants.
- Introduce a new helper function, iic_use_direct_match(), that has
all of the logic for direct-config matching. If it returns true,
the driver returns the match result (which may be 0). If it returns
false, the driver does indirect-config matching.
- iic_compat_match() now returns a weighted match quality; matches to
lower-indexed "compatible" device property are more-specific matches,
and return a better match quality accordingly.

XXX This driver is an odd-ball with respect to the hardware device.
See comments in the match routine. Unclear how best to handle it.

branches: 1.7.16;
convert device polling from callout to kthread.
Solves:
- hung initialization on A20 (bananapi)
- allows iic_exec() implementations to use condvars

Declare sensor data invalid when reading the sensor failed (device is gone).

Tests showed that the sensor needs at least 30ms after a MR (measurement
request) to have valid data ready, so the driver didn't work very well.
Now the MR is sent in configurable intervals (hw.hythygtemp0.interval)
using callout(9), so that valid data is immediately available for
sysmon's sensor refresh. When the refresh comes too close after the last
MR, then the previous values are used.

Update module dependencies for all the existing modules that depend on sysmon components.

i2c devices don't actually have a dependency on "iic" (the bus driver)
but on "i2cexec". Create an i2cexec module (i2c_exec.c) to mirror the
dependencies in files.i2c and switch device drivers to depend on "i2cexec"
module instead.

A kernel with a USB stack and no I2C controller / bus attachment would spit
out a bunch of "WARNING: module error: can't find builtin dependency `iic'"
messages at boot. This change solves that problem.

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.8;
allow i2c address 0x01-0x7F
ignore responses if the sensor is in command mode

branches: 1.1.2;
add HYT-221/271/939 humidity/temperature I2C sensor
extend envsys(4) framework by %rH (relative humidity)

More cleanup to i2c autoconfiguration:

- Get all of the drivers onto the new match quality constants.
- Introduce a new helper function, iic_use_direct_match(), that has
all of the logic for direct-config matching. If it returns true,
the driver returns the match result (which may be 0). If it returns
false, the driver does indirect-config matching.
- iic_compat_match() now returns a weighted match quality; matches to
lower-indexed "compatible" device property are more-specific matches,
and return a better match quality accordingly.

XXX This driver is an odd-ball with respect to the hardware device.
See comments in the match routine. Unclear how best to handle it.

branches: 1.7.16;
convert device polling from callout to kthread.
Solves:
- hung initialization on A20 (bananapi)
- allows iic_exec() implementations to use condvars

Declare sensor data invalid when reading the sensor failed (device is gone).

Tests showed that the sensor needs at least 30ms after a MR (measurement
request) to have valid data ready, so the driver didn't work very well.
Now the MR is sent in configurable intervals (hw.hythygtemp0.interval)
using callout(9), so that valid data is immediately available for
sysmon's sensor refresh. When the refresh comes too close after the last
MR, then the previous values are used.

Update module dependencies for all the existing modules that depend on sysmon components.

i2c devices don't actually have a dependency on "iic" (the bus driver)
but on "i2cexec". Create an i2cexec module (i2c_exec.c) to mirror the
dependencies in files.i2c and switch device drivers to depend on "i2cexec"
module instead.

A kernel with a USB stack and no I2C controller / bus attachment would spit
out a bunch of "WARNING: module error: can't find builtin dependency `iic'"
messages at boot. This change solves that problem.

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.8;
allow i2c address 0x01-0x7F
ignore responses if the sensor is in command mode

branches: 1.1.2;
add HYT-221/271/939 humidity/temperature I2C sensor
extend envsys(4) framework by %rH (relative humidity)

convert device polling from callout to kthread.
Solves:
- hung initialization on A20 (bananapi)
- allows iic_exec() implementations to use condvars

Declare sensor data invalid when reading the sensor failed (device is gone).

Tests showed that the sensor needs at least 30ms after a MR (measurement
request) to have valid data ready, so the driver didn't work very well.
Now the MR is sent in configurable intervals (hw.hythygtemp0.interval)
using callout(9), so that valid data is immediately available for
sysmon's sensor refresh. When the refresh comes too close after the last
MR, then the previous values are used.

Update module dependencies for all the existing modules that depend on sysmon components.

i2c devices don't actually have a dependency on "iic" (the bus driver)
but on "i2cexec". Create an i2cexec module (i2c_exec.c) to mirror the
dependencies in files.i2c and switch device drivers to depend on "i2cexec"
module instead.

A kernel with a USB stack and no I2C controller / bus attachment would spit
out a bunch of "WARNING: module error: can't find builtin dependency `iic'"
messages at boot. This change solves that problem.

branches: 1.2.2; 1.2.4; 1.2.6; 1.2.8;
allow i2c address 0x01-0x7F
ignore responses if the sensor is in command mode

branches: 1.1.2;
add HYT-221/271/939 humidity/temperature I2C sensor
extend envsys(4) framework by %rH (relative humidity)