1 files changed, 155 insertions, 0 deletions

diff --git a/drivers/mfd/wm831x-i2c.c b/drivers/mfd/wm831x-i2c.c
new file mode 100644
index 000000000000..a06cbc739716
--- /dev/null
+++ b/drivers/mfd/wm831x-i2c.c
@@ -0,0 +1,155 @@
+/*
+ * wm831x-i2c.c  --  I2C access for Wolfson WM831x PMICs
+ *
+ * Copyright 2009,2010 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 as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/mfd/core.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/wm831x/core.h>
+#include <linux/mfd/wm831x/pdata.h>
+
+static int wm831x_i2c_read_device(struct wm831x *wm831x, unsigned short reg,
+                                  int bytes, void *dest)
+{
+        struct i2c_client *i2c = wm831x->control_data;
+        int ret;
+        u16 r = cpu_to_be16(reg);
+
+        ret = i2c_master_send(i2c, (unsigned char *)&r, 2);
+        if (ret < 0)
+                return ret;
+        if (ret != 2)
+                return -EIO;
+
+        ret = i2c_master_recv(i2c, dest, bytes);
+        if (ret < 0)
+                return ret;
+        if (ret != bytes)
+                return -EIO;
+        return 0;
+}
+
+/* Currently we allocate the write buffer on the stack; this is OK for
+ * small writes - if we need to do large writes this will need to be
+ * revised.
+ */
+static int wm831x_i2c_write_device(struct wm831x *wm831x, unsigned short reg,
+                                   int bytes, void *src)
+{
+        struct i2c_client *i2c = wm831x->control_data;
+        struct i2c_msg xfer[2];
+        int ret;
+
+        reg = cpu_to_be16(reg);
+
+        xfer[0].addr = i2c->addr;
+        xfer[0].flags = 0;
+        xfer[0].len = 2;
+        xfer[0].buf = (char *)&reg;
+
+        xfer[1].addr = i2c->addr;
+        xfer[1].flags = I2C_M_NOSTART;
+        xfer[1].len = bytes;
+        xfer[1].buf = (char *)src;
+
+        ret = i2c_transfer(i2c->adapter, xfer, 2);
+        if (ret < 0)
+                return ret;
+        if (ret != 2)
+                return -EIO;
+
+        return 0;
+}
+
+static int wm831x_i2c_probe(struct i2c_client *i2c,
+                            const struct i2c_device_id *id)
+{
+        struct wm831x *wm831x;
+
+        wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL);
+        if (wm831x == NULL)
+                return -ENOMEM;
+
+        i2c_set_clientdata(i2c, wm831x);
+        wm831x->dev = &i2c->dev;
+        wm831x->control_data = i2c;
+        wm831x->read_dev = wm831x_i2c_read_device;
+        wm831x->write_dev = wm831x_i2c_write_device;
+
+        return wm831x_device_init(wm831x, id->driver_data, i2c->irq);
+}
+
+static int wm831x_i2c_remove(struct i2c_client *i2c)
+{
+        struct wm831x *wm831x = i2c_get_clientdata(i2c);
+
+        wm831x_device_exit(wm831x);
+
+        return 0;
+}
+
+static int wm831x_i2c_suspend(struct device *dev)
+{
+        struct wm831x *wm831x = dev_get_drvdata(dev);
+
+        return wm831x_device_suspend(wm831x);
+}
+
+static const struct i2c_device_id wm831x_i2c_id[] = {
+        { "wm8310", WM8310 },
+        { "wm8311", WM8311 },
+        { "wm8312", WM8312 },
+        { "wm8320", WM8320 },
+        { "wm8321", WM8321 },
+        { "wm8325", WM8325 },
+        { "wm8326", WM8326 },
+        { }
+};
+MODULE_DEVICE_TABLE(i2c, wm831x_i2c_id);
+
+static const struct dev_pm_ops wm831x_pm_ops = {
+        .suspend = wm831x_i2c_suspend,
+};
+
+static struct i2c_driver wm831x_i2c_driver = {
+        .driver = {
+                .name = "wm831x",
+                .owner = THIS_MODULE,
+                .pm = &wm831x_pm_ops,
+        },
+        .probe = wm831x_i2c_probe,
+        .remove = wm831x_i2c_remove,
+        .id_table = wm831x_i2c_id,
+};
+
+static int __init wm831x_i2c_init(void)
+{
+        int ret;
+
+        ret = i2c_add_driver(&wm831x_i2c_driver);
+        if (ret != 0)
+                pr_err("Failed to register wm831x I2C driver: %d\n", ret);
+
+        return ret;
+}
+subsys_initcall(wm831x_i2c_init);
+
+static void __exit wm831x_i2c_exit(void)
+{
+        i2c_del_driver(&wm831x_i2c_driver);
+}
+module_exit(wm831x_i2c_exit);