drivers: regulator: add Maxim 8998 driver
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This patch adds voltage regulator driver for Maxim 8998 chip. This chip
is used on Samsung Aquila and GONI boards and provides following
functionalities:
- 4 BUCK voltage converters, 17 LDO power regulators and 5 other power
controllers
- battery charger
This patch adds basic driver for voltage regulators and MAX 8998 MFD core.
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/drivers/mfd/max8998.c b/drivers/mfd/max8998.c
new file mode 100644
index 0000000..0d68de2
--- /dev/null
+++ b/drivers/mfd/max8998.c
@@ -0,0 +1,160 @@
+/*
+ * max8698.c - mfd core driver for the Maxim 8998
+ *
+ * Copyright (C) 2009-2010 Samsung Electronics
+ * Kyungmin Park <kyungmin.park@samsung.com>
+ * Marek Szyprowski <m.szyprowski@samsung.com>
+ *
+ * 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 <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/max8998.h>
+#include <linux/mfd/max8998-private.h>
+
+static struct mfd_cell max8998_devs[] = {
+ {
+ .name = "max8998-pmic",
+ }
+};
+
+static int max8998_i2c_device_read(struct max8998_dev *max8998, u8 reg, u8 *dest)
+{
+ struct i2c_client *client = max8998->i2c_client;
+ int ret;
+
+ mutex_lock(&max8998->iolock);
+ ret = i2c_smbus_read_byte_data(client, reg);
+ mutex_unlock(&max8998->iolock);
+ if (ret < 0)
+ return ret;
+
+ ret &= 0xff;
+ *dest = ret;
+ return 0;
+}
+
+static int max8998_i2c_device_write(struct max8998_dev *max8998, u8 reg, u8 value)
+{
+ struct i2c_client *client = max8998->i2c_client;
+ int ret;
+
+ mutex_lock(&max8998->iolock);
+ ret = i2c_smbus_write_byte_data(client, reg, value);
+ mutex_unlock(&max8998->iolock);
+ return ret;
+}
+
+static int max8998_i2c_device_update(struct max8998_dev *max8998, u8 reg,
+ u8 val, u8 mask)
+{
+ struct i2c_client *client = max8998->i2c_client;
+ int ret;
+
+ mutex_lock(&max8998->iolock);
+ ret = i2c_smbus_read_byte_data(client, reg);
+ if (ret >= 0) {
+ u8 old_val = ret & 0xff;
+ u8 new_val = (val & mask) | (old_val & (~mask));
+ ret = i2c_smbus_write_byte_data(client, reg, new_val);
+ if (ret >= 0)
+ ret = 0;
+ }
+ mutex_unlock(&max8998->iolock);
+ return ret;
+}
+
+static int max8998_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct max8998_dev *max8998;
+ int ret = 0;
+
+ max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL);
+ if (max8998 == NULL) {
+ kfree(i2c);
+ return -ENOMEM;
+ }
+
+ i2c_set_clientdata(i2c, max8998);
+ max8998->dev = &i2c->dev;
+ max8998->i2c_client = i2c;
+ max8998->dev_read = max8998_i2c_device_read;
+ max8998->dev_write = max8998_i2c_device_write;
+ max8998->dev_update = max8998_i2c_device_update;
+ mutex_init(&max8998->iolock);
+
+ ret = mfd_add_devices(max8998->dev, -1,
+ max8998_devs, ARRAY_SIZE(max8998_devs),
+ NULL, 0);
+ if (ret < 0)
+ goto err;
+
+ return ret;
+
+err:
+ mfd_remove_devices(max8998->dev);
+ kfree(max8998);
+ return ret;
+}
+
+static int max8998_i2c_remove(struct i2c_client *i2c)
+{
+ struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
+
+ mfd_remove_devices(max8998->dev);
+ kfree(max8998);
+
+ return 0;
+}
+
+static const struct i2c_device_id max8998_i2c_id[] = {
+ { "max8998", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
+
+static struct i2c_driver max8998_i2c_driver = {
+ .driver = {
+ .name = "max8998",
+ .owner = THIS_MODULE,
+ },
+ .probe = max8998_i2c_probe,
+ .remove = max8998_i2c_remove,
+ .id_table = max8998_i2c_id,
+};
+
+static int __init max8998_i2c_init(void)
+{
+ return i2c_add_driver(&max8998_i2c_driver);
+}
+/* init early so consumer devices can complete system boot */
+subsys_initcall(max8998_i2c_init);
+
+static void __exit max8998_i2c_exit(void)
+{
+ i2c_del_driver(&max8998_i2c_driver);
+}
+module_exit(max8998_i2c_exit);
+
+MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver");
+MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
+MODULE_LICENSE("GPL");