Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / input / touchscreen / ad7879-i2c.c

diff --git a/kernel/drivers/input/touchscreen/ad7879-i2c.c b/kernel/drivers/input/touchscreen/ad7879-i2c.c
new file mode 100644 (file)
index 0000000..dcf3907
--- /dev/null
+++ b/kernel/drivers/input/touchscreen/ad7879-i2c.c
@@ -0,0 +1,109 @@
+/*
+ * 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 <linux/pm.h>
+
+#include "ad7879.h"
+
+#define AD7879_DEVID           0x79    /* AD7879-1/AD7889-1 */
+
+/* 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 i2c_smbus_read_word_swapped(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_swapped(client, reg, 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 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 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,
+               .pm     = &ad7879_pm_ops,
+       },
+       .probe          = ad7879_i2c_probe,
+       .remove         = ad7879_i2c_remove,
+       .id_table       = ad7879_id,
+};
+
+module_i2c_driver(ad7879_i2c_driver);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("AD7879(-1) touchscreen I2C bus driver");
+MODULE_LICENSE("GPL");