Input: ad7879 - split bus logic out

The ad7879 driver is using the old bus method of only supporting one
at a time (I2C or SPI). So refactor it like the other input drivers
that support multiple busses simultaneously.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/touchscreen/ad7879-i2c.c

@@ -0,0 +1,140 @@
+/*
+ * AD7879-1/AD7889-1 touchscreen (I2C bus)
+ *
+ * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/input.h>	/* BUS_I2C */
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/types.h>
+
+#include "ad7879.h"
+
+#define AD7879_DEVID		0x79	/* AD7879-1/AD7889-1 */
+
+#ifdef CONFIG_PM
+static int ad7879_i2c_suspend(struct i2c_client *client, pm_message_t message)
+{
+	struct ad7879 *ts = i2c_get_clientdata(client);
+
+	ad7879_disable(ts);
+
+	return 0;
+}
+
+static int ad7879_i2c_resume(struct i2c_client *client)
+{
+	struct ad7879 *ts = i2c_get_clientdata(client);
+
+	ad7879_enable(ts);
+
+	return 0;
+}
+#else
+# define ad7879_i2c_suspend NULL
+# define ad7879_i2c_resume  NULL
+#endif
+
+/* All registers are word-sized.
+ * AD7879 uses a high-byte first convention.
+ */
+static int ad7879_i2c_read(struct device *dev, u8 reg)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	return swab16(i2c_smbus_read_word_data(client, reg));
+}
+
+static int ad7879_i2c_multi_read(struct device *dev,
+				 u8 first_reg, u8 count, u16 *buf)
+{
+	u8 idx;
+
+	for (idx = 0; idx < count; ++idx)
+		buf[idx] = ad7879_i2c_read(dev, first_reg + idx);
+
+	return 0;
+}
+
+static int ad7879_i2c_write(struct device *dev, u8 reg, u16 val)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+
+	return i2c_smbus_write_word_data(client, reg, swab16(val));
+}
+
+static const struct ad7879_bus_ops ad7879_i2c_bus_ops = {
+	.bustype	= BUS_I2C,
+	.read		= ad7879_i2c_read,
+	.multi_read	= ad7879_i2c_multi_read,
+	.write		= ad7879_i2c_write,
+};
+
+static int __devinit ad7879_i2c_probe(struct i2c_client *client,
+				      const struct i2c_device_id *id)
+{
+	struct ad7879 *ts;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_WORD_DATA)) {
+		dev_err(&client->dev, "SMBUS Word Data not Supported\n");
+		return -EIO;
+	}
+
+	ts = ad7879_probe(&client->dev, AD7879_DEVID, client->irq,
+			  &ad7879_i2c_bus_ops);
+	if (IS_ERR(ts))
+		return PTR_ERR(ts);
+
+	i2c_set_clientdata(client, ts);
+
+	return 0;
+}
+
+static int __devexit ad7879_i2c_remove(struct i2c_client *client)
+{
+	struct ad7879 *ts = i2c_get_clientdata(client);
+
+	ad7879_remove(ts);
+
+	return 0;
+}
+
+static const struct i2c_device_id ad7879_id[] = {
+	{ "ad7879", 0 },
+	{ "ad7889", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, ad7879_id);
+
+static struct i2c_driver ad7879_i2c_driver = {
+	.driver = {
+		.name	= "ad7879",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= ad7879_i2c_probe,
+	.remove		= __devexit_p(ad7879_i2c_remove),
+	.suspend	= ad7879_i2c_suspend,
+	.resume		= ad7879_i2c_resume,
+	.id_table	= ad7879_id,
+};
+
+static int __init ad7879_i2c_init(void)
+{
+	return i2c_add_driver(&ad7879_i2c_driver);
+}
+module_init(ad7879_i2c_init);
+
+static void __exit ad7879_i2c_exit(void)
+{
+	i2c_del_driver(&ad7879_i2c_driver);
+}
+module_exit(ad7879_i2c_exit);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("i2c:ad7879");