1 files changed, 143 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/ad7879-i2c.c b/drivers/input/touchscreen/ad7879-i2c.c
new file mode 100644
index 000000000000..d82a38ee9a3e
--- /dev/null
+++ b/drivers/input/touchscreen/ad7879-i2c.c
@@ -0,0 +1,143 @@
+/*
+ * 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_suspend(ts);
+
+        return 0;
+}
+
+static int ad7879_i2c_resume(struct i2c_client *client)
+{
+        struct ad7879 *ts = i2c_get_clientdata(client);
+
+        ad7879_resume(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)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        u8 idx;
+
+        i2c_smbus_read_i2c_block_data(client, first_reg, count * 2, (u8 *)buf);
+
+        for (idx = 0; idx < count; ++idx)
+                buf[idx] = swab16(buf[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");