linux-kernel - Re: [Patch V3 0/5] I2C ACPI operation region handler

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Date:	Fri, 30 May 2014 14:00:39 +0800
From:	Lan Tianyu <tianyu.lan@...el.com>
To:	wsa@...-dreams.de, rjw@...ysocki.net,
	mika.westerberg@...ux.intel.com, awilliam@...hat.com,
	lenb@...nel.org
CC:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [Patch V3 0/5] I2C ACPI operation region handler

On 05/20/2014 08:59 PM, Lan Tianyu wrote:
> ACPI 5.0 spec(5.5.2.4.5) defines GenericSerialBus(i2c, spi, uart) operation
> region. It allows ACPI aml code able to access such kind of devices to
> implement some ACPI standard method.
>
> On the Asus T100TA, Bios use GenericSerialBus operation region to access
> i2c device to get battery info. So battery function depends on the I2C
> operation region support. Here is the bug link.
> https://bugzilla.kernel.org/show_bug.cgi?id=69011
>

Hi Wolfram:
	Since this version resolved all comments, it's ok for you?

> Change since V2:
>          Drop patchs of adding I2C smbus quick read/write and word/block
> process call functions because not find machines supporting such protocols
> so far and can't test these functions.
>          Merge patchs of "I2C ACPI related code clear up" and "Add CONFIG_I2C_ACPI
> config"
> 	Patch 2: Add acpi_bus_detach_private_data() function to detach data from
> ACPI handle and replace ACPI_ERROR() with acpi_handle_debug() to avoid some redundant
> error log.
>
> Change since V1:
>         Fix some code style issues. Change prefix i2c_acpi to acpi_i2c.
> Move ACPI related code in the i2c core to i2c-acpi.c. Add CONFIG_I2C_ACPI
> and make i2c core built-in when it's set to avoid i2c ACPI operation region
> being removed.
>
> Lan Tianyu (5):
>    ACPICA: Export acpi_buffer_to_resource symbol
>    ACPI: Add acpi_bus_attach_private_data() to facilitate to attach data
>      to ACPI handle
>    ACPI/Thermal: Use acpi_bus_attach_private_data() to attach private
>      data
>    I2C/ACPI: Add i2c ACPI operation region support
>    I2C/ACPI: Clean up I2C ACPI code and Add CONFIG_I2C_ACPI config
>
>   drivers/acpi/acpica/rscreate.c |   1 +
>   drivers/acpi/bus.c             |  28 +++-
>   drivers/acpi/thermal.c         |  11 +-
>   drivers/i2c/Kconfig            |  18 +-
>   drivers/i2c/Makefile           |   5 +-
>   drivers/i2c/i2c-acpi.c         | 362 +++++++++++++++++++++++++++++++++++++++++
>   drivers/i2c/i2c-core.c         |  97 +----------
>   include/acpi/acpi_bus.h        |   2 +
>   include/linux/acpi.h           |  11 ++
>   include/linux/i2c.h            |  12 ++
>   10 files changed, 439 insertions(+), 108 deletions(-)
>   create mode 100644 drivers/i2c/i2c-acpi.c
>

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