Hi Marc,
On Fri, Jan 14, 2011 at 11:07:01AM +1100, Marc Reilly wrote:
> This series adds a driver for at24 eeproms. Much of the guts of the code
> is taken from the at24 driver in the linux kernel.
> The files are located under a new misc directory, as per the kernel also.
>
> Signed-off-by: Marc Reilly <marc@xxxxxxxxxxxxxxx>
> ---
> drivers/Kconfig | 1 +
> drivers/Makefile | 1 +
> drivers/misc/Kconfig | 10 ++++
> drivers/misc/Makefile | 1 +
> drivers/misc/at24.c | 130 +++++++++++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 143 insertions(+), 0 deletions(-)
> create mode 100644 drivers/misc/Kconfig
> create mode 100644 drivers/misc/Makefile
> create mode 100644 drivers/misc/at24.c
>
> diff --git a/drivers/Kconfig b/drivers/Kconfig
> index 86d8fb5..c54e225 100644
> --- a/drivers/Kconfig
> +++ b/drivers/Kconfig
> @@ -13,5 +13,6 @@ source "drivers/mci/Kconfig"
> source "drivers/clk/Kconfig"
> source "drivers/mfd/Kconfig"
> source "drivers/led/Kconfig"
> +source "drivers/misc/Kconfig"
>
> endmenu
> diff --git a/drivers/Makefile b/drivers/Makefile
> index b1b402f..2127857 100644
> --- a/drivers/Makefile
> +++ b/drivers/Makefile
> @@ -11,3 +11,4 @@ obj-$(CONFIG_VIDEO) += video/
> obj-y += clk/
> obj-y += mfd/
> obj-$(CONFIG_LED) += led/
> +obj-$(CONFIG_MISC) += misc/
> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> new file mode 100644
> index 0000000..7da647f
> --- /dev/null
> +++ b/drivers/misc/Kconfig
> @@ -0,0 +1,10 @@
> +menuconfig MISC
> + bool "Misc devices support"
> +
> +if MISC
> +
> +config AT24
> + bool "at24 based eeprom"
> + depends on I2C
> +
> +endif
> diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
> new file mode 100644
> index 0000000..45d6553
> --- /dev/null
> +++ b/drivers/misc/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_AT24) += at24.o
> diff --git a/drivers/misc/at24.c b/drivers/misc/at24.c
> new file mode 100644
> index 0000000..7bb085a
> --- /dev/null
> +++ b/drivers/misc/at24.c
> @@ -0,0 +1,130 @@
> +/*
> + * Copyright (C) 2007 Sascha Hauer, Pengutronix
> + * 2009 Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
> + * 2010 Marc Reilly, Creative Product Design
> + *
> + * 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 <misc/at24.h>
> +
> +#define DRIVERNAME "at24"
> +
> +#define to_at24(a) container_of(a, struct at24, cdev)
> +
> +static ssize_t at24_read(struct cdev *cdev, void *_buf, size_t count,
> + ulong offset, ulong flags)
> +{
> + struct at24 *priv = to_at24(cdev);
> + u8 *buf = _buf;
> + size_t i = count;
> + ssize_t numwritten = 0;
> + int retries = 5;
> + int ret;
> +
> + while (i && retries) {
> + ret = i2c_read_reg(priv->client, offset, buf, i);
> + if (ret < 0)
> + return (ssize_t)ret;
> + else if (ret == 0)
> + --retries;
> +
> + numwritten += ret;
> + i -= ret;
> + offset += ret;
> + buf += ret;
> + }
> +
> + return numwritten;
> +}
> +
> +static ssize_t at24_write(struct cdev *cdev, const void *_buf, size_t count,
> + ulong offset, ulong flags)
> +{
> + struct at24 *priv = to_at24(cdev);
> + const u8 *buf = _buf;
> + const int maxwrite = 8;
> + int numtowrite;
> + ssize_t numwritten = 0;
> +
> + while (count) {
> + int ret;
> +
> + numtowrite = count;
> + if (numtowrite > maxwrite)
> + numtowrite = maxwrite;
> +
> + ret = i2c_write_reg(priv->client, offset, buf, numtowrite);
> + if (ret < 0)
> + return (ssize_t)ret;
> +
> + mdelay(10);
> +
> + numwritten += ret;
> + buf += ret;
> + count -= ret;
> + offset += ret;
> + }
> +
> + return numwritten;
> +}
> +
> +static struct file_operations at24_fops = {
> + .lseek = dev_lseek_default,
> + .read = at24_read,
> + .write = at24_write,
> +};
> +
> +static int at24_probe(struct device_d *dev)
> +{
> + struct at24 *at24;
> + struct at24_platform_data *pdata;
> + at24 = xzalloc(sizeof(*at24));
> +
> + dev->priv = at24;
> + pdata = dev->platform_data;
> +
> + at24->cdev.name = DRIVERNAME;
You should use at24->cdev.name = asprintf("%s%d", DRIVERNAME, dev->id);
here to support multiple eeproms. Note that this afaics needs patching
i2c_new_device to initialize client->dev.id to -1 to make sure the i2c
device gets an autoassigned id.
Sascha
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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