linux-kernel - Re: [PATCH v2] i2c: i801: Register optional lis3lv02d i2c device on Dell machines

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Date:   Sun, 28 Jan 2018 15:45:09 +0100
From:   Pali Rohár <pali.rohar@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Jean Delvare <jdelvare@...e.com>, Wolfram Sang <wsa@...-dreams.de>,
        Michał Kępień <kernel@...pniu.pl>,
        Steven Honeyman <stevenhoneyman@...il.com>,
        Valdis Kletnieks <Valdis.Kletnieks@...edu>,
        Jochen Eisinger <jochen@...guin-breeder.org>,
        Gabriele Mazzotta <gabriele.mzt@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        Mario Limonciello <Mario_Limonciello@...l.com>,
        Alex Hung <alex.hung@...onical.com>,
        Takashi Iwai <tiwai@...e.de>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH v2] i2c: i801: Register optional lis3lv02d i2c device on
 Dell machines

On Sunday 28 January 2018 16:39:25 Andy Shevchenko wrote:
> On Sat, Jan 27, 2018 at 3:32 PM, Pali Rohár <pali.rohar@...il.com> wrote:
> > +static bool is_dell_system_with_lis3lv02d(void)
> > +{
> 
> > +       /*
> > +        * Check that ACPI device SMO88xx exists and is enabled. That ACPI
> > +        * device represent our ST microelectronics lis3lv02d accelerometer but
> > +        * unfortunately without any other information (like i2c address).
> > +        */
> 
> Isn't it simple
> 
> return acpi_dev_present("SMO88", NULL, -1);
> 
> call?

ACPI device name is SMO8800, SMO8810, ... Will that acpi_dev_present
function match only prefix and not exact string?

> > +       found = false;
> > +       status = acpi_get_devices(NULL, check_acpi_smo88xx_device, NULL,
> > +                                 (void **)&found);
> > +       if (!ACPI_SUCCESS(status) || !found)
> > +               return false;
> > +
> > +       return true;
> > +}
> 
> 

-- 
Pali Rohár
pali.rohar@...il.com

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