From: Lan Tianyu <tianyu.lan@intel.com>
To: Wolfram Sang <wsa@the-dreams.de>
Cc: rjw@rjwysocki.net, mika.westerberg@linux.intel.com,
awilliam@redhat.com, lenb@kernel.org, linux-i2c@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org
Subject: Re: [Patch V2 6/9] I2C: Add smbus word/block process call helper function
Date: Sat, 17 May 2014 21:59:14 +0800 [thread overview]
Message-ID: <53776B32.8010400@intel.com> (raw)
In-Reply-To: <20140517102110.GB2602@katana>
On 05/17/2014 06:21 PM, Wolfram Sang wrote:
> On Mon, Apr 28, 2014 at 10:27:45PM +0800, Lan Tianyu wrote:
>> Add i2c_smbus_word/block_proc_call() helper function. These will be used
>> in the implementation of i2c ACPI address space handler.
>>
>> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
>> Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
>> ---
>> drivers/i2c/i2c-core.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++
>> include/linux/i2c.h | 4 ++++
>> 2 files changed, 60 insertions(+)
>>
>> diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
>> index 3bf0048..638befd 100644
>> --- a/drivers/i2c/i2c-core.c
>> +++ b/drivers/i2c/i2c-core.c
>> @@ -2306,6 +2306,30 @@ s32 i2c_smbus_write_word_data(const struct i2c_client *client, u8 command,
>> EXPORT_SYMBOL(i2c_smbus_write_word_data);
>>
>> /**
>> + * i2c_smbus_word_proc_call - SMBus "word proc call" protocol
>> + * @client: Handle to slave device
>> + * @command: Byte interpreted by slave
>> + * @value: 16-bit "word" being written
>> + *
>> + * This executes the SMBus "word proc all" protocol, returning negative errno
>> + * else a 16-bit unsigned "word" received from the device.
>> + */
>> +s32 i2c_smbus_word_proc_call(const struct i2c_client *client, u8 command,
>> + u16 value)
>> +{
>> + union i2c_smbus_data data;
>> + int status;
>> +
>> + data.word = value;
>> + status = i2c_smbus_xfer(client->adapter, client->addr, client->flags,
>> + I2C_SMBUS_READ, command,
>> + I2C_SMBUS_PROC_CALL, &data);
>> +
>> + return (status < 0) ? status : data.word;
>> +}
>> +EXPORT_SYMBOL(i2c_smbus_word_proc_call);
>> +
>> +/**
>
> Same as smbus_quick function before, documentation updates are missing.
> Also similar, we had such a function before which was removed due to no
> users? It looks very much like the function here, so we should stick to
> the old naming IMO. Is it the old one? Such information would be nice
> since it affects reviewing.
Yes, there was an old function and commit c8110933 removed it. Sorry, I didn't
that before. I will bring the old one back.
>
>> * i2c_smbus_read_block_data - SMBus "block read" protocol
>> * @client: Handle to slave device
>> * @command: Byte interpreted by slave
>> @@ -2362,6 +2386,38 @@ s32 i2c_smbus_write_block_data(const struct i2c_client *client, u8 command,
>> }
>> EXPORT_SYMBOL(i2c_smbus_write_block_data);
>>
>> +/**
>> + * i2c_smbus_block_proc_call - SMBus "block write" protocol
>> + * @client: Handle to slave device
>> + * @command: Byte interpreted by slave
>> + * @length: Size of data block; SMBus allows at most 32 bytes
>> + * @values: Byte array which will be written.
>> + *
>> + * This executes the SMBus "block proc call" protocol, returning negative errno
>> + * else the number of read bytes.
>> + */
>> +s32 i2c_smbus_block_proc_call(const struct i2c_client *client, u8 command,
>> + u8 length, u8 *values)
>
> Please rename to "i2c_smbus_block_process_call" as the old function was
> named. Needs documentation updates.
>
>> + if (length > I2C_SMBUS_BLOCK_MAX)
>> + length = I2C_SMBUS_BLOCK_MAX;
>
> I think we should return an error here.
Ok.
>
> BTW what were your test scenarios for these functions and smbus quick?
>
From ACPI spec, Read/Write quick and Word/Block process call protocol will be
used by Bios ACPI code. But so far, I don't find such machines. So these
functions has not been tested.
next prev parent reply other threads:[~2014-05-17 13:59 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-16 13:24 [PATCH 0/9] I2C ACPI operation region handler support Lan Tianyu
2014-04-16 13:24 ` [PATCH 1/9] ACPICA: Executer: Fix buffer allocation issue for generic_serial_bus region field accesses Lan Tianyu
2014-04-21 21:38 ` Rafael J. Wysocki
2014-04-22 1:14 ` Lan Tianyu
2014-04-16 13:24 ` [PATCH 2/9] ACPICA: Export acpi_buffer_to_resource symbol Lan Tianyu
2014-04-16 13:24 ` [PATCH 3/9] ACPI: Add acpi_bus_attach_private_data() to facilitate to attach data to ACPI handle Lan Tianyu
2014-04-16 13:24 ` [PATCH 4/9] ACPI/Thermal: Use acpi_bus_attach_private_data() to attach private data Lan Tianyu
2014-04-16 13:24 ` [PATCH 5/9] I2C: Add smbus quick read/write helper function Lan Tianyu
2014-04-16 13:24 ` [PATCH 6/9] I2C: Add smbus word/block process call " Lan Tianyu
2014-04-16 13:24 ` [PATCH 7/9] I2C/ACPI: Add i2c ACPI operation region support Lan Tianyu
2014-04-16 13:24 ` [PATCH 8/9] I2C/ACPI: Move ACPI related code to i2c-acpi.c Lan Tianyu
2014-04-16 13:24 ` [PATCH 9/9] I2C/ACPI: Add CONFIG_I2C_ACPI config Lan Tianyu
2014-04-16 13:33 ` [PATCH 0/9] I2C ACPI operation region handler support Lan Tianyu
2014-04-16 16:35 ` Adam Williamson
2014-04-22 6:24 ` [Resend Patch " Lan Tianyu
2014-04-22 6:24 ` [Resend Patch 1/9] ACPICA: Executer: Fix buffer allocation issue for generic_serial_bus region field accesses Lan Tianyu
2014-04-22 11:21 ` Mika Westerberg
2014-04-22 6:24 ` [Resend Patch 2/9] ACPICA: Export acpi_buffer_to_resource symbol Lan Tianyu
2014-04-22 11:21 ` Mika Westerberg
2014-04-22 6:24 ` [Resend Patch 3/9] ACPI: Add acpi_bus_attach_private_data() to facilitate to attach data to ACPI handle Lan Tianyu
2014-04-22 11:23 ` Mika Westerberg
2014-04-22 6:24 ` [Resend Patch 4/9] ACPI/Thermal: Use acpi_bus_attach_private_data() to attach private data Lan Tianyu
2014-04-22 11:24 ` Mika Westerberg
2014-04-22 6:24 ` [Resend Patch 5/9] I2C: Add smbus quick read/write helper function Lan Tianyu
2014-04-22 11:24 ` Mika Westerberg
2014-04-22 6:24 ` [Resend Patch 6/9] I2C: Add smbus word/block process call " Lan Tianyu
2014-04-22 11:26 ` Mika Westerberg
2014-04-22 6:24 ` [Resend Patch 7/9] I2C/ACPI: Add i2c ACPI operation region support Lan Tianyu
2014-04-22 11:36 ` Mika Westerberg
2014-04-23 1:53 ` Lan Tianyu
2014-04-23 7:28 ` Mika Westerberg
2014-04-23 7:17 ` Lan Tianyu
2014-04-22 6:24 ` [Resend Patch 8/9] I2C/ACPI: Move ACPI related code to i2c-acpi.c Lan Tianyu
2014-04-22 11:38 ` Mika Westerberg
2014-04-22 6:24 ` [Resend Patch 9/9] I2C/ACPI: Add CONFIG_I2C_ACPI config Lan Tianyu
2014-04-22 11:45 ` Mika Westerberg
2014-04-23 5:39 ` Lan Tianyu
2014-04-23 6:47 ` Zheng, Lv
2014-04-23 7:40 ` Mika Westerberg
2014-04-23 23:03 ` [Resend Patch 0/9] I2C ACPI operation region handler support Adam Williamson
2014-04-28 14:27 ` [Patch V2 " Lan Tianyu
2014-04-28 14:27 ` [Patch V2 1/9] ACPICA: Executer: Fix buffer allocation issue for generic_serial_bus region field accesses Lan Tianyu
2014-04-28 17:52 ` Adam Williamson
2014-04-28 18:08 ` Adam Williamson
2014-04-28 22:50 ` Rafael J. Wysocki
2014-04-29 11:31 ` Wolfram Sang
2014-04-29 21:37 ` Rafael J. Wysocki
2014-04-28 14:27 ` [Patch V2 2/9] ACPICA: Export acpi_buffer_to_resource symbol Lan Tianyu
2014-04-28 14:27 ` [Patch V2 3/9] ACPI: Add acpi_bus_attach_private_data() to facilitate to attach data to ACPI handle Lan Tianyu
2014-04-28 14:27 ` [Patch V2 4/9] ACPI/Thermal: Use acpi_bus_attach_private_data() to attach private data Lan Tianyu
2014-04-28 14:27 ` [Patch V2 5/9] I2C: Add smbus quick read/write helper function Lan Tianyu
2014-05-17 9:41 ` Wolfram Sang
2014-05-17 13:13 ` Lan Tianyu
2014-05-17 17:15 ` Wolfram Sang
2014-04-28 14:27 ` [Patch V2 6/9] I2C: Add smbus word/block process call " Lan Tianyu
2014-05-17 10:21 ` Wolfram Sang
2014-05-17 13:59 ` Lan Tianyu [this message]
2014-05-17 17:17 ` Wolfram Sang
2014-05-19 9:23 ` Lan Tianyu
2014-04-28 14:27 ` [Patch V2 7/9] I2C/ACPI: Add i2c ACPI operation region support Lan Tianyu
2014-04-29 8:02 ` Mika Westerberg
2014-04-28 14:27 ` [Patch V2 8/9] I2C/ACPI: Move ACPI related code to i2c-acpi.c Lan Tianyu
2014-04-28 14:27 ` [Patch V2 9/9] I2C/ACPI: Add CONFIG_I2C_ACPI config Lan Tianyu
2014-04-29 8:16 ` Mika Westerberg
2014-05-17 17:48 ` Wolfram Sang
2014-05-19 8:49 ` Mika Westerberg
2014-05-19 9:44 ` Lan Tianyu
2014-05-19 20:23 ` Rafael J. Wysocki
2014-04-28 22:51 ` [Patch V2 0/9] I2C ACPI operation region handler support Rafael J. Wysocki
2014-04-29 1:54 ` Lan Tianyu
2014-04-29 15:47 ` Rafael J. Wysocki
2014-05-13 13:09 ` Rolf Eike Beer
2014-05-13 14:06 ` Lan Tianyu
2014-05-15 7:50 ` Rolf Eike Beer
2014-05-15 14:49 ` Lan Tianyu
2014-05-16 8:43 ` Rolf Eike Beer
2014-05-20 14:17 ` Rolf Eike Beer
2014-05-22 15:14 ` Lan Tianyu
2014-05-23 6:55 ` Rolf Eike Beer
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