linux-kernel - Re: [PATCH 1/4] toshiba_acpi: Add support for USB Sleep and Charge function

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Date:	Sun, 18 Jan 2015 10:55:51 -0800
From:	Darren Hart <dvhart@...radead.org>
To:	Azael Avalos <coproscefalo@...il.com>
Cc:	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] toshiba_acpi: Add support for USB Sleep and Charge
 function

On Wed, Jan 14, 2015 at 02:40:18PM -0700, Azael Avalos wrote:
> Newer Toshiba models now come with a feature called Sleep and Charge,
> where the computer USB ports remain powered when the computer is
> asleep or turned off.
> 
> This patch adds support to such feature, creating a sysfs entry
> called "usb_sleep_charge" to set the desired charging mode or to
> disable it.
> 
> The sysfs entry accepts three parameters, 0x0, 0x9 and 0x21, beign
> disabled, alternate and auto respectively.
> 
> Signed-off-by: Azael Avalos <coproscefalo@...il.com>
> ---
>  drivers/platform/x86/toshiba_acpi.c | 112 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 112 insertions(+)
...

> +static ssize_t toshiba_usb_sleep_charge_store(struct device *dev,
> +					      struct device_attribute *attr,
> +					      const char *buf, size_t count)
> +{
> +	struct toshiba_acpi_dev *toshiba = dev_get_drvdata(dev);
> +	int state;
> +	int ret;
> +
> +	ret = kstrtoint(buf, 0, &state);
> +	if (ret)
> +		return ret;
> +
> +	/* Set the USB charging mode where:
> +	 * 0x30000 - Disable
> +	 * 0x30009 - Alternate
> +	 * 0x30021 - Auto
> +	 */
> +	state |= 0x30000;
> +	if (state != SCI_USB_CHARGE_DISABLED && state != SCI_USB_CHARGE_AUTO &&
> +	    state != SCI_USB_CHARGE_ALTERNATE)
> +		return -EINVAL;

Sorry, I missed this as the input validation on my first pass. Looks good.

-- 
Darren Hart
Intel Open Source Technology Center
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