Re: SMBus access

[Randy.Dunlap]

On Sat, 01 Jul 2006 22:57:34 +0200 Johan Vromans wrote:

> To get battery readings on some laptops it is necessary to interface
> with the SMBus that hangs of the EC. However, the current
> implementation of the EC driver does not permit other modules 
> read/write access. 
> 
> A trivial solution is to change acpi_ec_read/write from static to
> nonstatic, and export the symbols so other modules can use them.
> 
> Would there be any objections to apply this change?

a.  patch should also be sent to linux-acpi@xxxxxxxxxxxxxxx (cc-ed)
b.  patch does not apply cleanly to latest kernel
c.  missing Signed-off-by: line (see Documentation/SubmittingPatches)
d.  incorrect patch filename directory level (see SubmittingPatches)



> -- Johan
> 
> --- drivers/acpi/ec.c~	2006-04-17 13:40:49.000000000 +0200
> +++ drivers/acpi/ec.c	2006-04-22 17:49:13.000000000 +0200
> @@ -305,20 +305,22 @@
>  }
>  #endif /* ACPI_FUTURE_USAGE */
>  
> -static int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data)
> +int acpi_ec_read(union acpi_ec *ec, u8 address, u32 * data)
>  {
>  	if (acpi_ec_poll_mode)
>  		return acpi_ec_poll_read(ec, address, data);
>  	else
>  		return acpi_ec_intr_read(ec, address, data);
>  }
> -static int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data)
> +EXPORT_SYMBOL(acpi_ec_read);
> +int acpi_ec_write(union acpi_ec *ec, u8 address, u8 data)
>  {
>  	if (acpi_ec_poll_mode)
>  		return acpi_ec_poll_write(ec, address, data);
>  	else
>  		return acpi_ec_intr_write(ec, address, data);
>  }
> +EXPORT_SYMBOL(acpi_ec_write);
>  static int acpi_ec_poll_read(union acpi_ec *ec, u8 address, u32 * data)
>  {
>  	acpi_status status = AE_OK;
> -


---
~Randy
-
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