From: Darren Hart <dvhart@infradead.org>
To: Frans Klaver <fransklaver@gmail.com>
Cc: Corentin Chary <corentin.chary@gmail.com>,
Rafael Wysocki <rafael.j.wysocki@intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
acpi4asus-user@lists.sourceforge.net,
platform-driver-x86@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 07/13] eeepc-laptop: make disp attribute really write-only
Date: Mon, 15 Sep 2014 13:00:07 -0700 [thread overview]
Message-ID: <20140915200007.GB62440@vmdeb7> (raw)
In-Reply-To: <1410563212-31565-8-git-send-email-fransklaver@gmail.com>
On Sat, Sep 13, 2014 at 01:06:46AM +0200, Frans Klaver wrote:
> The disp attribute is write-only, but sysfs doesn't know this. Currently
> show_sys_acpi() is mimicking sysfs behavior, if the underlying acpi call
> should fail. This is not ideal; behaving like sysfs is better left to
> sysfs.
>
> Introduce EEEPC_CREATE_DEVICE_ATTR_WO() to instantiate a write-only
> attribute, and declare the disp attribute with it. Sysfs makes sure
> userspace can only write to disp at all times. This also means we can
> back to propagating any errors from get_acpi().
>
> Signed-off-by: Frans Klaver <fransklaver@gmail.com>
> ---
> drivers/platform/x86/eeepc-laptop.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c
> index 3c04b77..4f6490d 100644
> --- a/drivers/platform/x86/eeepc-laptop.c
> +++ b/drivers/platform/x86/eeepc-laptop.c
> @@ -291,7 +291,7 @@ static ssize_t show_sys_acpi(struct device *dev, int cm, char *buf)
> int value = get_acpi(eeepc, cm);
>
> if (value < 0)
> - return -EIO;
> + return value;
> return sprintf(buf, "%d\n", value);
> }
>
> @@ -316,9 +316,13 @@ static ssize_t show_sys_acpi(struct device *dev, int cm, char *buf)
> EEEPC_ACPI_STORE_FUNC(_name, _cm) \
> static DEVICE_ATTR(_name, _mode, show_##_name, store_##_name)
>
> +#define EEEPC_CREATE_DEVICE_ATTR_WO(_name, _mode, _cm) \
> + EEEPC_ACPI_STORE_FUNC(_name, _cm) \
> + static DEVICE_ATTR(_name, _mode, NULL, store_##_name)
Per Greg's previous reply, I presume DEVICE_ATTR_WO here?
> +
> EEEPC_CREATE_DEVICE_ATTR(camera, S_IWUSR | S_IRUGO, CM_ASL_CAMERA);
> EEEPC_CREATE_DEVICE_ATTR(cardr, S_IWUSR | S_IRUGO, CM_ASL_CARDREADER);
> -EEEPC_CREATE_DEVICE_ATTR(disp, S_IWUSR, CM_ASL_DISPLAYSWITCH);
> +EEEPC_CREATE_DEVICE_ATTR_WO(disp, S_IWUSR, CM_ASL_DISPLAYSWITCH);
>
> struct eeepc_cpufv {
> int num;
> --
> 2.1.0
>
> --
> To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
--
Darren Hart
Intel Open Source Technology Center
next prev parent reply other threads:[~2014-09-15 20:00 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-12 23:06 [PATCH 00/13] eeepc-laptop cleanups Frans Klaver
2014-09-12 23:06 ` [PATCH 01/13] eeepc-laptop: coding style: fix indentation Frans Klaver
2014-09-12 23:06 ` [PATCH 02/13] eeepc-laptop: coding style: add curly braces around else compound Frans Klaver
2014-09-12 23:06 ` [PATCH 03/13] " Frans Klaver
2014-09-15 19:41 ` Darren Hart
2014-09-15 19:58 ` Frans Klaver
2014-09-12 23:06 ` [PATCH 04/13] eeepc-laptop: use symbolic permissions in device attributes Frans Klaver
2014-09-12 23:06 ` [PATCH 05/13] eeepc-laptop: use DEVICE_ATTR to instantiate device_attributes Frans Klaver
2014-09-12 23:28 ` Greg Kroah-Hartman
2014-09-14 22:05 ` Frans Klaver
2014-09-12 23:06 ` [PATCH 06/13] eeepc-laptop: pull out ACPI_STORE_FUNC and ACPI_SHOW_FUNC macros Frans Klaver
2014-09-12 23:06 ` [PATCH 07/13] eeepc-laptop: make disp attribute really write-only Frans Klaver
2014-09-15 20:00 ` Darren Hart [this message]
2014-09-15 20:01 ` Frans Klaver
2014-09-12 23:06 ` [PATCH 08/13] eeepc-laptop: pull out SENSOR_STORE_FUNC and SENSOR_SHOW_FUNC macros Frans Klaver
2014-09-12 23:06 ` [PATCH 09/13] eeepc-laptop: make fan1_input really read-only Frans Klaver
2014-09-12 23:06 ` [PATCH 10/13] eeepc-laptop: compare proper return values in get_cpufv Frans Klaver
2014-09-15 21:49 ` Darren Hart
2014-09-15 21:51 ` Greg Kroah-Hartman
2014-09-15 21:55 ` Frans Klaver
2014-09-16 11:54 ` Frans Klaver
2014-09-16 20:52 ` Darren Hart
2014-09-16 21:10 ` Frans Klaver
2014-09-16 23:39 ` Darren Hart
2014-09-16 21:27 ` Darren Hart
2014-09-16 21:33 ` Greg Kroah-Hartman
2014-09-16 21:40 ` Frans Klaver
2014-09-16 21:43 ` Darren Hart
2014-09-17 10:34 ` Henrique de Moraes Holschuh
2014-09-17 11:57 ` Frans Klaver
2014-09-17 16:12 ` Darren Hart
2014-09-12 23:06 ` [PATCH 11/13] eeepc-laptop: propagate errors from get_cpufv Frans Klaver
2014-09-15 21:50 ` Darren Hart
2014-09-12 23:06 ` [PATCH 12/13] eeepc-laptop: store_cpufv: return error if set_acpi fails Frans Klaver
2014-09-12 23:06 ` [PATCH 13/13] eeepc-laptop: return -ENXIO if acpi getter or setter fails Frans Klaver
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