linux-kernel - Re: [PATCH try #2] Input/Joystick Driver: add support AD7142 joystick driver

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Date:	Fri, 12 Oct 2007 18:41:31 +0200
From:	"Ahmed S. Darwish" <darwish.07@...il.com>
To:	Bryan Wu <bryan.wu@...log.com>
Cc:	dmitry.torokhov@...il.com, linux-input@...ey.karlin.mff.cuni.cz,
	linux-joystick@...ey.karlin.mff.cuni.cz,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH try #2] Input/Joystick Driver: add support AD7142 joystick driver

On Fri, Oct 12, 2007 at 03:38:47PM +0800, Bryan Wu wrote:
>
> Signed-off-by: Bryan Wu <bryan.wu@...log.com>
> ---

Hi Bryan,

Why creating module's own kthread to call ad7142_decode and process keycodes 
instead of using a tasklet ?

Isn't disabling device interrupts from the begining of the ISR "ad7142_interrupt"
till the kthread "ad7142_thread" got waked-up and scheduled a long time,
espicially if there's a high load on the userspace side ?

Minor issues below.

> +
> +/* R    ADC stage 0 - 11 result (uncompensated) actually located in SRAM */
> +#define ADCRESULT_S0		0x0B
> +#define ADCRESULT_S1		0x0C
> +#define ADCRESULT_S2		0x0D
> +#define ADCRESULT_S3		0x0E
> +#define ADCRESULT_S4		0x0F
> +#define ADCRESULT_S5		0x10
> +#define ADCRESULT_S6		0x11
> +#define ADCRESULT_S7		0x12
> +#define ADCRESULT_S8		0x13
> +#define ADCRESULT_S9		0x14
> +#define ADCRESULT_S10		0x15
> +#define ADCRESULT_S11		0x16
> +

Keeping last two lines aligned with their above counterparts ?

> +static int
> +ad7142_probe(struct i2c_adapter *adap, int addr, int kind)
> +{
> +	struct i2c_client *client;
> +	int rc;
> +
> +	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
> +	if (!client)
> +		return -ENOMEM;
> +	memset(client, 0, sizeof(struct i2c_client));

kzalloc.

Regards,

-- 
Ahmed S. Darwish
HomePage: http://darwish.07.googlepages.com
Blog: http://darwish-07.blogspot.com
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