linux-kernel - Re: Synaptics touchscreen for HTC Dream: check that smbus is available

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Date:	Mon, 17 Aug 2009 16:47:59 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Pavel Machek <pavel@....cz>
Cc:	soni.trilok@...il.com, greg@...ah.com, arve@...roid.com,
	linux-kernel@...r.kernel.org, swetland@...gle.com,
	dmitry.torokhov@...il.com, dtor@...l.ru,
	linux-input@...r.kernel.org, linux-i2c@...r.kernel.org
Subject: Re: Synaptics touchscreen for HTC Dream: check that smbus is
 available

On Sat, 8 Aug 2009 15:40:50 +0200
Pavel Machek <pavel@....cz> wrote:

> > >> Because this driver is using smbus i2c apis, it will be good to add
> > >> that check too.
> > >
> > > So I should do something like
> > >
> > > if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
> > > __ __ __ __...
> > >
> > > in addition?
> > 
> > Yes.
> 
> Ok, here it is.
> 
> --- 
> 
> Check that SMBUS APIs are available in touchscreen driver.

Why?

> Signed-off-by: Pavel Machek <pavel@....cz>
> 
> diff --git a/drivers/staging/dream/synaptics_i2c_rmi.c b/drivers/staging/dream/synaptics_i2c_rmi.c
> index dc1e3c7..6e23276 100644
> --- a/drivers/staging/dream/synaptics_i2c_rmi.c
> +++ b/drivers/staging/dream/synaptics_i2c_rmi.c
> @@ -373,6 +373,12 @@ static int __devinit synaptics_ts_probe(
>  		goto err_check_functionality_failed;
>  	}
>  
> +	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) {
> +		pr_err("synaptics_ts_probe: need I2C_FUNC_SMBUS_WORD_DATA\n");
> +		ret = -ENODEV;
> +		goto err_check_functionality_failed;
> +	}
> +
>  	ts = kzalloc(sizeof(*ts), GFP_KERNEL);
>  	if (ts == NULL) {
>  		ret = -ENOMEM;

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