i2c: add driver for the MC34704 PMIC

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

3 files changed, 144 insertions, 0 deletions

diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index f1b2949fa7..a9ee411404 100644
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -10,6 +10,9 @@ config DRIVER_I2C_IMX
 config DRIVER_I2C_MC13892
 	bool "MC13892 a.k.a. PMIC driver"
 
+config DRIVER_I2C_MC34704
+	bool "MC34704 PMIC driver"
+
 config DRIVER_I2C_MC9SDZ60
 	bool "MC9SDZ60 driver"
 
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index 62d030bf0b..13e58040f7 100644
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -3,5 +3,6 @@ obj-$(CONFIG_I2C) += i2c.o
 obj-$(CONFIG_DRIVER_I2C_IMX) += i2c-imx.o
 
 obj-$(CONFIG_DRIVER_I2C_MC13892) += mc13892.o
+obj-$(CONFIG_DRIVER_I2C_MC34704) += mc34704.o
 obj-$(CONFIG_DRIVER_I2C_MC9SDZ60) += mc9sdz60.o
 obj-$(CONFIG_DRIVER_I2C_LP3972) += lp3972.o
diff --git a/drivers/i2c/mc34704.c b/drivers/i2c/mc34704.c
new file mode 100644
index 0000000000..51a8737209
--- /dev/null
+++ b/drivers/i2c/mc34704.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2007 Sascha Hauer, Pengutronix
+ *               2009 Marc Kleine-Budde <mkl@pengutronix.de>
+ * Copyright (C) 2010 Baruch Siach <baruch@tkos.co.il>
+ *
+ * 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 <i2c/mc34704.h>
+
+#define DRIVERNAME		"mc34704"
+
+#define to_mc34704(a)		container_of(a, struct mc34704, cdev)
+
+static struct mc34704 *mc34704_dev;
+
+struct mc34704 *mc34704_get(void)
+{
+	if (!mc34704_dev)
+		return NULL;
+
+	return mc34704_dev;
+}
+EXPORT_SYMBOL(mc34704_get);
+
+int mc34704_reg_read(struct mc34704 *mc34704, u8 reg, u8 *val)
+{
+	int ret;
+
+	ret = i2c_read_reg(mc34704->client, reg, val, 1);
+
+	return ret == 1 ? 0 : ret;
+}
+EXPORT_SYMBOL(mc34704_reg_read)
+
+int mc34704_reg_write(struct mc34704 *mc34704, u8 reg, u8 val)
+{
+	int ret;
+
+	ret = i2c_write_reg(mc34704->client, reg, &val, 1);
+
+	return ret == 1 ? 0 : ret;
+}
+EXPORT_SYMBOL(mc34704_reg_write)
+
+static ssize_t mc34704_read(struct cdev *cdev, void *_buf, size_t count,
+		ulong offset, ulong flags)
+{
+	struct mc34704 *priv = to_mc34704(cdev);
+	u8 *buf = _buf;
+	size_t i = count;
+	int err;
+
+	while (i) {
+		err = mc34704_reg_read(priv, offset, buf);
+		if (err)
+			return (ssize_t)err;
+		buf++;
+		i--;
+		offset++;
+	}
+
+	return count;
+}
+
+static ssize_t mc34704_write(struct cdev *cdev, const void *_buf, size_t count,
+		ulong offset, ulong flags)
+{
+	struct mc34704 *mc34704 = to_mc34704(cdev);
+	const u8 *buf = _buf;
+	size_t i = count;
+	int err;
+
+	while (i) {
+		err = mc34704_reg_write(mc34704, offset, *buf);
+		if (err)
+			return (ssize_t)err;
+		buf++;
+		i--;
+		offset++;
+	}
+
+	return count;
+}
+
+static struct file_operations mc34704_fops = {
+	.lseek	= dev_lseek_default,
+	.read	= mc34704_read,
+	.write	= mc34704_write,
+};
+
+static int mc34704_probe(struct device_d *dev)
+{
+	if (mc34704_dev)
+		return -EBUSY;
+
+	mc34704_dev = xzalloc(sizeof(struct mc34704));
+	mc34704_dev->cdev.name = DRIVERNAME;
+	mc34704_dev->client = to_i2c_client(dev);
+	mc34704_dev->cdev.size = 256;
+	mc34704_dev->cdev.dev = dev;
+	mc34704_dev->cdev.ops = &mc34704_fops;
+
+	devfs_create(&mc34704_dev->cdev);
+
+	return 0;
+}
+
+static struct driver_d mc34704_driver = {
+	.name  = DRIVERNAME,
+	.probe = mc34704_probe,
+};
+
+static int mc34704_init(void)
+{
+	register_driver(&mc34704_driver);
+        return 0;
+}
+device_initcall(mc34704_init);