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SubjectRe: [PATCH resend 2/6] toshiba_acpi: Add fan entry to sysfs
On Mon, Feb 09, 2015 at 08:34:50PM -0700, Azael Avalos wrote:
> This patch adds a fan entry to sysfs, enabling the user to get and
> set the fan status.
>

Hi Azael,

I was finally getting around to these when you resent them. Apologies for the
delay. Travel and still fighting a cold/flu/bug. Sigh. Anyway... on to patch
review :-)

> Signed-off-by: Azael Avalos <coproscefalo@gmail.com>
> ---
> drivers/platform/x86/toshiba_acpi.c | 51 ++++++++++++++++++++++++++++++++++++-
> 1 file changed, 50 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
> index 334b65e..413af60 100644
> --- a/drivers/platform/x86/toshiba_acpi.c
> +++ b/drivers/platform/x86/toshiba_acpi.c
> @@ -1516,6 +1516,11 @@ static const struct backlight_ops toshiba_backlight_data = {
> */
> static ssize_t toshiba_version_show(struct device *dev,
> struct device_attribute *attr, char *buf);
> +static ssize_t toshiba_fan_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count);
> +static ssize_t toshiba_fan_show(struct device *dev,
> + struct device_attribute *attr, char *buf);
> static ssize_t toshiba_kbd_bl_mode_store(struct device *dev,
> struct device_attribute *attr,
> const char *buf, size_t count);
> @@ -1569,6 +1574,8 @@ static ssize_t toshiba_usb_sleep_music_store(struct device *dev,
> const char *buf, size_t count);
>
> static DEVICE_ATTR(version, S_IRUGO, toshiba_version_show, NULL);
> +static DEVICE_ATTR(fan, S_IRUGO | S_IWUSR,
> + toshiba_fan_show, toshiba_fan_store);
> static DEVICE_ATTR(kbd_backlight_mode, S_IRUGO | S_IWUSR,
> toshiba_kbd_bl_mode_show, toshiba_kbd_bl_mode_store);
> static DEVICE_ATTR(kbd_type, S_IRUGO, toshiba_kbd_type_show, NULL);

At some point, before we add too much more, it would be nice to convert these
over to DEVICE_ATTR_RW and DEVICE_ATTR_RO. Any reason not to do this sooner
rather than later?

> @@ -1594,6 +1601,7 @@ static DEVICE_ATTR(usb_sleep_music, S_IRUGO | S_IWUSR,
>
> static struct attribute *toshiba_attributes[] = {
> &dev_attr_version.attr,
> + &dev_attr_fan.attr,
> &dev_attr_kbd_backlight_mode.attr,
> &dev_attr_kbd_type.attr,
> &dev_attr_available_kbd_modes.attr,
> @@ -1621,6 +1629,45 @@ static ssize_t toshiba_version_show(struct device *dev,
> return sprintf(buf, "%s\n", TOSHIBA_ACPI_VERSION);
> }
>
> +static ssize_t toshiba_fan_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct toshiba_acpi_dev *toshiba = dev_get_drvdata(dev);
> + u32 result;
> + int state;
> + int ret;
> +
> + ret = kstrtoint(buf, 0, &state);
> + if (ret)
> + return ret;
> +
> + if (state != 0 && state != 1)
> + return -EINVAL;
> +
> + result = hci_write1(toshiba, HCI_FAN, state);
> + if (result == TOS_FAILURE)
> + return -EIO;
> + else if (result == TOS_NOT_SUPPORTED)
> + return -ENODEV;
> +

A quick scan of hci_write1 makes me wonder if there are more than two possible
failures. Should we also have an "else if (result)" or "else if (result !=
WHATEVER_SUCCESS_IS)" before we assume success and return count?

--
Darren Hart
Intel Open Source Technology Center


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