Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpio / gpio-max7300.c

diff --git a/kernel/drivers/gpio/gpio-max7300.c b/kernel/drivers/gpio/gpio-max7300.c
new file mode 100644 (file)
index 0000000..0cc2c27
--- /dev/null
+++ b/kernel/drivers/gpio/gpio-max7300.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2009 Wolfram Sang, Pengutronix
+ *
+ * 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.
+ *
+ * Check max730x.c for further details.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/i2c.h>
+#include <linux/spi/max7301.h>
+#include <linux/slab.h>
+
+static int max7300_i2c_write(struct device *dev, unsigned int reg,
+                               unsigned int val)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+
+       return i2c_smbus_write_byte_data(client, reg, val);
+}
+
+static int max7300_i2c_read(struct device *dev, unsigned int reg)
+{
+       struct i2c_client *client = to_i2c_client(dev);
+
+       return i2c_smbus_read_byte_data(client, reg);
+}
+
+static int max7300_probe(struct i2c_client *client,
+                        const struct i2c_device_id *id)
+{
+       struct max7301 *ts;
+
+       if (!i2c_check_functionality(client->adapter,
+                       I2C_FUNC_SMBUS_BYTE_DATA))
+               return -EIO;
+
+       ts = devm_kzalloc(&client->dev, sizeof(struct max7301), GFP_KERNEL);
+       if (!ts)
+               return -ENOMEM;
+
+       ts->read = max7300_i2c_read;
+       ts->write = max7300_i2c_write;
+       ts->dev = &client->dev;
+
+       return __max730x_probe(ts);
+}
+
+static int max7300_remove(struct i2c_client *client)
+{
+       return __max730x_remove(&client->dev);
+}
+
+static const struct i2c_device_id max7300_id[] = {
+       { "max7300", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, max7300_id);
+
+static struct i2c_driver max7300_driver = {
+       .driver = {
+               .name = "max7300",
+               .owner = THIS_MODULE,
+       },
+       .probe = max7300_probe,
+       .remove = max7300_remove,
+       .id_table = max7300_id,
+};
+
+static int __init max7300_init(void)
+{
+       return i2c_add_driver(&max7300_driver);
+}
+subsys_initcall(max7300_init);
+
+static void __exit max7300_exit(void)
+{
+       i2c_del_driver(&max7300_driver);
+}
+module_exit(max7300_exit);
+
+MODULE_AUTHOR("Wolfram Sang");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MAX7300 GPIO-Expander");