diff options
Diffstat (limited to 'drivers/i2c/mc9sdz60.c')
-rw-r--r-- | drivers/i2c/mc9sdz60.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/i2c/mc9sdz60.c b/drivers/i2c/mc9sdz60.c new file mode 100644 index 0000000000..4b1068d17e --- /dev/null +++ b/drivers/i2c/mc9sdz60.c @@ -0,0 +1,109 @@ +/* + * Copyright (C) 2007 Sascha Hauer, Pengutronix + * 2009 Marc Kleine-Budde <mkl@pengutronix.de> + * + * 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 "mc9sdz60" + +struct mc_priv { + struct cdev cdev; + struct i2c_client *client; +}; + +#define to_mc_priv(a) container_of(a, struct mc_priv, cdev) + +static struct mc_priv *mc_dev; + +struct i2c_client *mc9sdz60_get_client(void) +{ + if (!mc_dev) + return NULL; + + return mc_dev->client; +} + +static u32 mc_read_reg(struct mc_priv *mc, int reg) +{ + u8 buf; + + i2c_read_reg(mc->client, reg, &buf, sizeof(buf)); + + return buf; +} + +static ssize_t mc_read(struct cdev *cdev, void *_buf, size_t count, ulong offset, ulong flags) +{ + struct mc_priv *priv = to_mc_priv(cdev); + int i = count; + u8 *buf = _buf; + + while (i) { + *buf = mc_read_reg(priv, offset); + buf++; + i--; + offset++; + } + + return count; +} + +static struct file_operations mc_fops = { + .lseek = dev_lseek_default, + .read = mc_read, +}; + +static int mc_probe(struct device_d *dev) +{ + if (mc_dev) + return -EBUSY; + + mc_dev = xzalloc(sizeof(struct mc_priv)); + mc_dev->cdev.name = DRIVERNAME; + mc_dev->client = to_i2c_client(dev); + mc_dev->cdev.size = 256; + mc_dev->cdev.dev = dev; + mc_dev->cdev.ops = &mc_fops; + + devfs_create(&mc_dev->cdev); + + return 0; +} + +static struct driver_d mc_driver = { + .name = DRIVERNAME, + .probe = mc_probe, +}; + +static int mc_init(void) +{ + register_driver(&mc_driver); + return 0; +} + +device_initcall(mc_init); |