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From: Roel Kluin <12o3l@tiscali.nl>
To: bryan.wu@analog.com
Cc: dmitry.torokhov@gmail.com, linux-input@atrey.karlin.mff.cuni.cz,
	linux-joystick@atrey.karlin.mff.cuni.cz,
	linux-kernel@vger.kernel.org, akpm@linux-foundation.org
Subject: Re: [PATCH try #2] Input/Joystick Driver: add support AD7142 joystick driver
Date: Fri, 12 Oct 2007 11:14:03 +0200	[thread overview]
Message-ID: <470F3ADB.2000704@tiscali.nl> (raw)
In-Reply-To: <1192174727.6247.20.camel@roc-laptop>

Bryan Wu wrote:
> +static int ad7142_i2c_read(struct i2c_client *client, unsigned short offset,
> +		unsigned short *data, unsigned int len)
> +{
> +	int ret = -1;
> +	int i;
> +	u8 block_data[32];
> +
> +	if (len < 1 && len > 16) {

you want || here

> +		printk(KERN_ERR "AD7142: read data length error\n");
> +		return ret;
> +	}
> +
> +	/* Do raw I2C, not smbus compatible */
> +	block_data[0] = (offset & 0xFF00) >> 8;
> +	block_data[1] = (offset & 0x00FF);
> +
> +	ret = i2c_master_send(client, block_data, 2);
> +	if (ret < 0) {
> +		printk(KERN_ERR "AD7142: I2C read error\n");
> +		return ret;
> +	}
> +
> +	ret = i2c_master_recv(client, block_data, len * 2);
> +	if (ret < 0) {
> +		printk(KERN_ERR "AD7142: I2C transfer error\n");
> +		return ret;
> +	}
> +
> +	for (i = 0; i < len; i++) {
> +		unsigned short temp;
> +		temp = block_data[2 * i];
> +		temp = (temp << 8) & 0xFF00;
> +		*data++ = temp | block_data[2 * i + 1];
> +	}
> +
> +	return ret;
> +}



  parent reply	other threads:[~2007-10-12  9:24 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-10-12  7:38 Bryan Wu
2007-10-12  7:51 ` Andrey Panin
2007-10-12  9:14 ` Roel Kluin [this message]
2007-10-12 14:49 ` Dmitry Torokhov
2007-10-12 15:39   ` Bryan Wu
2007-10-12 15:50     ` Dmitry Torokhov
2007-10-12 15:59       ` Bryan Wu
2007-10-12 16:14         ` Dmitry Torokhov
2007-10-12 16:41 ` Ahmed S. Darwish
2007-10-12 17:29   ` Dmitry Torokhov
2007-10-12 19:21     ` Ahmed S. Darwish
2007-10-12 20:23       ` Dmitry Torokhov

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