linux-kernel - Re: [PATCH 1/1] cpufreq: eeepc 900 frequency scaling driver

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Message-ID: <20081123180409.GB7731@ucw.cz>
Date:	Sun, 23 Nov 2008 19:04:09 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Cristiano Prisciandaro <cristiano.p@...net.ch>
Cc:	Dave Jones <davej@...hat.com>, cpufreq@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] cpufreq: eeepc 900 frequency scaling driver

On Sun 2008-11-23 16:27:06, Cristiano Prisciandaro wrote:
> From: Cristiano Prisciandaro <cristiano.p@...net.ch>
> 
> The bios of the eeepc 900 exposes an acpi method that allows clocking
> the cpu to 630/900 MHz. This driver allows controlling the frequency
> switch through the cpufreq subsystem.

Is this really needed? Could we simply talk to the cpu directly,
without help of ACPI?

> +/* write to the acpi handle (from asus_acpi.c) */
> +static int write_eee900_acpi_int(acpi_handle handle, const char *method,
> +				 int val, struct acpi_buffer *output)
> +{
> +	struct acpi_object_list params;
> +	union acpi_object in_obj;
> +	acpi_status status;
> +
> +	params.count = 1;
> +	params.pointer = &in_obj;
> +	in_obj.type = ACPI_TYPE_INTEGER;
> +	in_obj.integer.value = val;
> +	status = acpi_evaluate_object(handle, (char *)method, &params, output);
> +	return status == AE_OK;
> +}

-- 
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