On Tue, May 18, 2010 at 11:26:47AM +0200, Eric Bénard wrote:
> this driver is needed to introduce i2c commands
This approach limits the i2cdev support to exactly one bus which is not
good. What we can do here is:
- collect all available adapters in a list in drivers/i2c/i2c.c
- implement i2c_get_adapter(int busnum) to get an adapter from its
busnum
- then you can add a -b busnum argument to the i2c_read/i2c_write commands
and use i2c_get_adapter() there. You don't need this file anymore then.
Sascha
>
> Signed-off-by: Eric Bénard <eric@xxxxxxxxxx>
> ---
> drivers/i2c/Kconfig | 3 ++
> drivers/i2c/Makefile | 1 +
> drivers/i2c/i2cdev.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 87 insertions(+), 0 deletions(-)
> create mode 100644 drivers/i2c/i2cdev.c
>
> diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
> index f1b2949..cbd2464 100644
> --- a/drivers/i2c/Kconfig
> +++ b/drivers/i2c/Kconfig
> @@ -16,4 +16,7 @@ config DRIVER_I2C_MC9SDZ60
> config DRIVER_I2C_LP3972
> bool "LP3972 driver"
>
> +config DRIVER_I2C_I2CDEV
> + bool "I2CDEV driver"
> +
> endif
> diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
> index 62d030b..a193f9c 100644
> --- a/drivers/i2c/Makefile
> +++ b/drivers/i2c/Makefile
> @@ -5,3 +5,4 @@ obj-$(CONFIG_DRIVER_I2C_IMX) += i2c-imx.o
> obj-$(CONFIG_DRIVER_I2C_MC13892) += mc13892.o
> obj-$(CONFIG_DRIVER_I2C_MC9SDZ60) += mc9sdz60.o
> obj-$(CONFIG_DRIVER_I2C_LP3972) += lp3972.o
> +obj-$(CONFIG_DRIVER_I2C_I2CDEV) += i2cdev.o
> diff --git a/drivers/i2c/i2cdev.c b/drivers/i2c/i2cdev.c
> new file mode 100644
> index 0000000..194db6c
> --- /dev/null
> +++ b/drivers/i2c/i2cdev.c
> @@ -0,0 +1,83 @@
> +/*
> + * Copyright (C) 2007 Sascha Hauer, Pengutronix
> + * 2009 Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
> + * 2009 Eric Benard <eric@xxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
> + * MA 02111-1307 USA
> + *
> + */
> +
> +#include <common.h>
> +#include <init.h>
> +#include <driver.h>
> +#include <xfuncs.h>
> +#include <errno.h>
> +
> +#include <i2c/i2c.h>
> +
> +#include <asm/byteorder.h>
> +
> +#define DRIVERNAME "i2cdev"
> +
> +struct i2cdev_priv {
> + struct cdev cdev;
> + struct i2c_client *client;
> +};
> +
> +#define to_i2cdev_priv(a) container_of(a, struct i2cdev_priv, cdev)
> +
> +static struct i2cdev_priv *i2cdev_dev;
> +
> +struct i2c_client *i2cdev_get_client(void)
> +{
> + if (!i2cdev_dev)
> + return NULL;
> +
> + return i2cdev_dev->client;
> +}
> +
> +static struct file_operations i2cdev_fops = {
> +};
> +
> +static int i2cdev_probe(struct device_d *dev)
> +{
> + if (i2cdev_dev)
> + return -EBUSY;
> +
> + i2cdev_dev = xzalloc(sizeof(struct i2cdev_priv));
> + i2cdev_dev->cdev.name = DRIVERNAME;
> + i2cdev_dev->client = to_i2c_client(dev);
> + i2cdev_dev->cdev.size = 256;
> + i2cdev_dev->cdev.dev = dev;
> + i2cdev_dev->cdev.ops = &i2cdev_fops;
> +
> + devfs_create(&i2cdev_dev->cdev);
> +
> + return 0;
> +}
> +
> +static struct driver_d i2cdev_driver = {
> + .name = DRIVERNAME,
> + .probe = i2cdev_probe,
> +};
> +
> +static int i2cdev_init(void)
> +{
> + register_driver(&i2cdev_driver);
> + return 0;
> +}
> +
> +device_initcall(i2cdev_init);
> --
> 1.6.3.3
>
>
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