mfd: Split 88pm8607 driver

Create 88pm8607-i2c driver to support all I2C operation of 88PM8607.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/88pm860x-i2c.c

@@ -0,0 +1,202 @@
+/*
+ * I2C driver for Marvell 88PM8607
+ *
+ * Copyright (C) 2009 Marvell International Ltd.
+ * 	Haojian Zhuang <haojian.zhuang@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/mfd/88pm8607.h>
+
+static inline int pm8607_read_device(struct pm8607_chip *chip,
+				     int reg, int bytes, void *dest)
+{
+	struct i2c_client *i2c = chip->client;
+	unsigned char data;
+	int ret;
+
+	data = (unsigned char)reg;
+	ret = i2c_master_send(i2c, &data, 1);
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_master_recv(i2c, dest, bytes);
+	if (ret < 0)
+		return ret;
+	return 0;
+}
+
+static inline int pm8607_write_device(struct pm8607_chip *chip,
+				      int reg, int bytes, void *src)
+{
+	struct i2c_client *i2c = chip->client;
+	unsigned char buf[bytes + 1];
+	int ret;
+
+	buf[0] = (unsigned char)reg;
+	memcpy(&buf[1], src, bytes);
+
+	ret = i2c_master_send(i2c, buf, bytes + 1);
+	if (ret < 0)
+		return ret;
+	return 0;
+}
+
+int pm8607_reg_read(struct pm8607_chip *chip, int reg)
+{
+	unsigned char data;
+	int ret;
+
+	mutex_lock(&chip->io_lock);
+	ret = chip->read(chip, reg, 1, &data);
+	mutex_unlock(&chip->io_lock);
+
+	if (ret < 0)
+		return ret;
+	else
+		return (int)data;
+}
+EXPORT_SYMBOL(pm8607_reg_read);
+
+int pm8607_reg_write(struct pm8607_chip *chip, int reg,
+		     unsigned char data)
+{
+	int ret;
+
+	mutex_lock(&chip->io_lock);
+	ret = chip->write(chip, reg, 1, &data);
+	mutex_unlock(&chip->io_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(pm8607_reg_write);
+
+int pm8607_bulk_read(struct pm8607_chip *chip, int reg,
+		     int count, unsigned char *buf)
+{
+	int ret;
+
+	mutex_lock(&chip->io_lock);
+	ret = chip->read(chip, reg, count, buf);
+	mutex_unlock(&chip->io_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(pm8607_bulk_read);
+
+int pm8607_bulk_write(struct pm8607_chip *chip, int reg,
+		      int count, unsigned char *buf)
+{
+	int ret;
+
+	mutex_lock(&chip->io_lock);
+	ret = chip->write(chip, reg, count, buf);
+	mutex_unlock(&chip->io_lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(pm8607_bulk_write);
+
+int pm8607_set_bits(struct pm8607_chip *chip, int reg,
+		    unsigned char mask, unsigned char data)
+{
+	unsigned char value;
+	int ret;
+
+	mutex_lock(&chip->io_lock);
+	ret = chip->read(chip, reg, 1, &value);
+	if (ret < 0)
+		goto out;
+	value &= ~mask;
+	value |= data;
+	ret = chip->write(chip, reg, 1, &value);
+out:
+	mutex_unlock(&chip->io_lock);
+	return ret;
+}
+EXPORT_SYMBOL(pm8607_set_bits);
+
+
+static const struct i2c_device_id pm860x_id_table[] = {
+	{ "88PM8607", 0 },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, pm860x_id_table);
+
+static int __devinit pm860x_probe(struct i2c_client *client,
+				  const struct i2c_device_id *id)
+{
+	struct pm8607_platform_data *pdata = client->dev.platform_data;
+	struct pm8607_chip *chip;
+	int ret;
+
+	chip = kzalloc(sizeof(struct pm8607_chip), GFP_KERNEL);
+	if (chip == NULL)
+		return -ENOMEM;
+
+	chip->client = client;
+	chip->dev = &client->dev;
+	chip->read = pm8607_read_device;
+	chip->write = pm8607_write_device;
+	memcpy(&chip->id, id, sizeof(struct i2c_device_id));
+	i2c_set_clientdata(client, chip);
+
+	mutex_init(&chip->io_lock);
+	dev_set_drvdata(chip->dev, chip);
+
+	ret = pm860x_device_init(chip, pdata);
+	if (ret < 0)
+		goto out;
+
+
+	return 0;
+
+out:
+	i2c_set_clientdata(client, NULL);
+	kfree(chip);
+	return ret;
+}
+
+static int __devexit pm860x_remove(struct i2c_client *client)
+{
+	struct pm8607_chip *chip = i2c_get_clientdata(client);
+
+	kfree(chip);
+	return 0;
+}
+
+static struct i2c_driver pm860x_driver = {
+	.driver	= {
+		.name	= "88PM860x",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= pm860x_probe,
+	.remove		= __devexit_p(pm860x_remove),
+	.id_table	= pm860x_id_table,
+};
+
+static int __init pm860x_i2c_init(void)
+{
+	int ret;
+	ret = i2c_add_driver(&pm860x_driver);
+	if (ret != 0)
+		pr_err("Failed to register 88PM860x I2C driver: %d\n", ret);
+	return ret;
+}
+subsys_initcall(pm860x_i2c_init);
+
+static void __exit pm860x_i2c_exit(void)
+{
+	i2c_del_driver(&pm860x_driver);
+}
+module_exit(pm860x_i2c_exit);
+
+MODULE_DESCRIPTION("I2C Driver for Marvell 88PM860x");
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
+MODULE_LICENSE("GPL");