mfd: arizona: I2C bus interface

Several forthcoming Wolfson devices are based on a common platform
known as Arizona allowing a great deal of reuse of driver code. This
patch adds I2C bus interface code for the devices.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 89 insertions, 0 deletions

diff --git a/drivers/mfd/arizona-i2c.c b/drivers/mfd/arizona-i2c.c
new file mode 100644
index 000000000000..75fb110105e1
--- /dev/null
+++ b/drivers/mfd/arizona-i2c.c
@@ -0,0 +1,89 @@
+/*
+ * Arizona-i2c.c  --  Arizona I2C bus interface
+ *
+ * Copyright 2012 Wolfson Microelectronics plc
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.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/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/arizona/core.h>
+
+#include "arizona.h"
+
+static __devinit int arizona_i2c_probe(struct i2c_client *i2c,
+                                          const struct i2c_device_id *id)
+{
+        struct arizona *arizona;
+        const struct regmap_config *regmap_config;
+        int ret;
+
+        switch (id->driver_data) {
+        case WM5102:
+                regmap_config = &wm5102_i2c_regmap;
+                break;
+        default:
+                dev_err(&i2c->dev, "Unknown device type %ld\n",
+                        id->driver_data);
+                return -EINVAL;
+        }
+
+        arizona = devm_kzalloc(&i2c->dev, sizeof(*arizona), GFP_KERNEL);
+        if (arizona == NULL)
+                return -ENOMEM;
+
+        arizona->regmap = devm_regmap_init_i2c(i2c, regmap_config);
+        if (IS_ERR(arizona->regmap)) {
+                ret = PTR_ERR(arizona->regmap);
+                dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
+                        ret);
+                return ret;
+        }
+
+        arizona->type = id->driver_data;
+        arizona->dev = &i2c->dev;
+        arizona->irq = i2c->irq;
+
+        return arizona_dev_init(arizona);
+}
+
+static int __devexit arizona_i2c_remove(struct i2c_client *i2c)
+{
+        struct arizona *arizona = dev_get_drvdata(&i2c->dev);
+        arizona_dev_exit(arizona);
+        return 0;
+}
+
+static const struct i2c_device_id arizona_i2c_id[] = {
+        { "wm5102", WM5102 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, arizona_i2c_id);
+
+static struct i2c_driver arizona_i2c_driver = {
+        .driver = {
+                .name   = "arizona",
+                .owner  = THIS_MODULE,
+                .pm     = &arizona_pm_ops,
+        },
+        .probe          = arizona_i2c_probe,
+        .remove         = __devexit_p(arizona_i2c_remove),
+        .id_table       = arizona_i2c_id,
+};
+
+module_i2c_driver(arizona_i2c_driver);
+
+MODULE_DESCRIPTION("Arizona I2C bus interface");
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_LICENSE("GPL");