[v2] i2c: i2c-scmi: add a MS HID

From: Edgar Cherkasov <echerkasov@dev.rtsoft.ru>

Description of the problem:
 - i2c-scmi driver contains only two identifiers "SMBUS01" and "SMBUSIBM";
 - the fist HID (SMBUS01) is clearly defined in "SMBus Control Method
   Interface Specification, version 1.0": "Each device must specify
   'SMBUS01' as its _HID and use a unique _UID value";
 - unfortunately, BIOS vendors (like AMI) seem to ignore this requirement
   and implement "SMB0001" HID instead of "SMBUS01";
 - I speculate that they do this because only "SMB0001" is hard coded in
   Windows SMBus driver produced by Microsoft.

This leads to following situation:
 - SMBus works out of box in Windows but not in Linux;
 - board vendors are forced to add correct "SMBUS01" HID to BIOS to make
   SMBus work in Linux. Moreover the same board vendors complain that
   tools (3-rd party ASL compiler) do not like the "SMBUS01" identifier
   and produce errors.  So they need to constantly patch the compiler for
   each new version of BIOS.

As it is very unlikely that BIOS vendors implement a correct HID in
future, I would propose to consider whether it is possible to work around
the problem by adding MS HID to the Linux i2c-scmi driver.

v2: move the definition of the new HID to the driver itself.

Signed-off-by: Edgar Cherkasov <echerkasov@dev.rtsoft.ru>
Signed-off-by: Michael Brunner <Michael.Brunner@kontron.com>
Acked-by: Viktor Krasnov <vkrasnov@dev.rtsoft.ru>
---
 drivers/i2c/busses/i2c-scmi.c | 4 ++++
 1 file changed, 4 insertions(+)

On Tue,  4 Apr 2017 19:18:27 +0300, Viktor Krasnov wrote:
> From: Edgar Cherkasov <echerkasov@dev.rtsoft.ru>
> 
> Description of the problem:
>  - i2c-scmi driver contains only two identifiers "SMBUS01" and "SMBUSIBM";
>  - the fist HID (SMBUS01) is clearly defined in "SMBus Control Method
>    Interface Specification, version 1.0": "Each device must specify
>    'SMBUS01' as its _HID and use a unique _UID value";
>  - unfortunately, BIOS vendors (like AMI) seem to ignore this requirement
>    and implement "SMB0001" HID instead of "SMBUS01";
>  - I speculate that they do this because only "SMB0001" is hard coded in
>    Windows SMBus driver produced by Microsoft.
> 
> This leads to following situation:
>  - SMBus works out of box in Windows but not in Linux;
>  - board vendors are forced to add correct "SMBUS01" HID to BIOS to make
>    SMBus work in Linux. Moreover the same board vendors complain that
>    tools (3-rd party ASL compiler) do not like the "SMBUS01" identifier
>    and produce errors.  So they need to constantly patch the compiler for
>    each new version of BIOS.
> 
> As it is very unlikely that BIOS vendors implement a correct HID in
> future, I would propose to consider whether it is possible to work around
> the problem by adding MS HID to the Linux i2c-scmi driver.
> 
> v2: move the definition of the new HID to the driver itself.
> 
> Signed-off-by: Edgar Cherkasov <echerkasov@dev.rtsoft.ru>
> Signed-off-by: Michael Brunner <Michael.Brunner@kontron.com>
> Acked-by: Viktor Krasnov <vkrasnov@dev.rtsoft.ru>

Reviewed-by: Jean Delvare <jdelvare@suse.de>

> ---
>  drivers/i2c/busses/i2c-scmi.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/i2c/busses/i2c-scmi.c b/drivers/i2c/busses/i2c-scmi.c
> index dfc98df..f876dd6 100644
> --- a/drivers/i2c/busses/i2c-scmi.c
> +++ b/drivers/i2c/busses/i2c-scmi.c
> @@ -18,6 +18,9 @@
>  #define ACPI_SMBUS_HC_CLASS		"smbus"
>  #define ACPI_SMBUS_HC_DEVICE_NAME	"cmi"
>  
> +/* SMBUS HID definition as supported by Microsoft Windows */
> +#define ACPI_SMBUS_MS_HID		"SMB0001"
> +
>  ACPI_MODULE_NAME("smbus_cmi");
>  
>  struct smbus_methods_t {
> @@ -51,6 +54,7 @@ struct acpi_smbus_cmi {
>  static const struct acpi_device_id acpi_smbus_cmi_ids[] = {
>  	{"SMBUS01", (kernel_ulong_t)&smbus_methods},
>  	{ACPI_SMBUS_IBM_HID, (kernel_ulong_t)&ibm_smbus_methods},
> +	{ACPI_SMBUS_MS_HID, (kernel_ulong_t)&smbus_methods},
>  	{"", 0}
>  };
>  MODULE_DEVICE_TABLE(acpi, acpi_smbus_cmi_ids);

On Wed, Apr 05, 2017 at 02:59:32PM +0200, Jean Delvare wrote:
> On Tue,  4 Apr 2017 19:18:27 +0300, Viktor Krasnov wrote:
> > From: Edgar Cherkasov <echerkasov@dev.rtsoft.ru>
> > 
> > Description of the problem:
> >  - i2c-scmi driver contains only two identifiers "SMBUS01" and "SMBUSIBM";
> >  - the fist HID (SMBUS01) is clearly defined in "SMBus Control Method
> >    Interface Specification, version 1.0": "Each device must specify
> >    'SMBUS01' as its _HID and use a unique _UID value";
> >  - unfortunately, BIOS vendors (like AMI) seem to ignore this requirement
> >    and implement "SMB0001" HID instead of "SMBUS01";
> >  - I speculate that they do this because only "SMB0001" is hard coded in
> >    Windows SMBus driver produced by Microsoft.
> > 
> > This leads to following situation:
> >  - SMBus works out of box in Windows but not in Linux;
> >  - board vendors are forced to add correct "SMBUS01" HID to BIOS to make
> >    SMBus work in Linux. Moreover the same board vendors complain that
> >    tools (3-rd party ASL compiler) do not like the "SMBUS01" identifier
> >    and produce errors.  So they need to constantly patch the compiler for
> >    each new version of BIOS.
> > 
> > As it is very unlikely that BIOS vendors implement a correct HID in
> > future, I would propose to consider whether it is possible to work around
> > the problem by adding MS HID to the Linux i2c-scmi driver.
> > 
> > v2: move the definition of the new HID to the driver itself.
> > 
> > Signed-off-by: Edgar Cherkasov <echerkasov@dev.rtsoft.ru>
> > Signed-off-by: Michael Brunner <Michael.Brunner@kontron.com>
> > Acked-by: Viktor Krasnov <vkrasnov@dev.rtsoft.ru>
> 
> Reviewed-by: Jean Delvare <jdelvare@suse.de>

Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
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On Tue, Apr 04, 2017 at 07:18:27PM +0300, Viktor Krasnov wrote:
> From: Edgar Cherkasov <echerkasov@dev.rtsoft.ru>
> 
> Description of the problem:
>  - i2c-scmi driver contains only two identifiers "SMBUS01" and "SMBUSIBM";
>  - the fist HID (SMBUS01) is clearly defined in "SMBus Control Method
>    Interface Specification, version 1.0": "Each device must specify
>    'SMBUS01' as its _HID and use a unique _UID value";
>  - unfortunately, BIOS vendors (like AMI) seem to ignore this requirement
>    and implement "SMB0001" HID instead of "SMBUS01";
>  - I speculate that they do this because only "SMB0001" is hard coded in
>    Windows SMBus driver produced by Microsoft.
> 
> This leads to following situation:
>  - SMBus works out of box in Windows but not in Linux;
>  - board vendors are forced to add correct "SMBUS01" HID to BIOS to make
>    SMBus work in Linux. Moreover the same board vendors complain that
>    tools (3-rd party ASL compiler) do not like the "SMBUS01" identifier
>    and produce errors.  So they need to constantly patch the compiler for
>    each new version of BIOS.
> 
> As it is very unlikely that BIOS vendors implement a correct HID in
> future, I would propose to consider whether it is possible to work around
> the problem by adding MS HID to the Linux i2c-scmi driver.
> 
> v2: move the definition of the new HID to the driver itself.
> 
> Signed-off-by: Edgar Cherkasov <echerkasov@dev.rtsoft.ru>
> Signed-off-by: Michael Brunner <Michael.Brunner@kontron.com>
> Acked-by: Viktor Krasnov <vkrasnov@dev.rtsoft.ru>

Applied to for-next, thanks!