1 files changed, 119 insertions, 0 deletions
diff --git a/drivers/mfd/wm831x-i2c.c b/drivers/mfd/wm831x-i2c.c
new file mode 100644
index 0000000000..694ddbbf03
--- /dev/null
+++ b/drivers/mfd/wm831x-i2c.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * wm831x-i2c.c  --  I2C access for Wolfson WM831x PMICs
+ *
+ * Copyright 2009,2010 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/mfd/core.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/wm831x/core.h>
+#include <linux/mfd/wm831x/pdata.h>
+
+static int wm831x_i2c_probe(struct i2c_client *i2c)
+{
+	const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
+	struct wm831x_pdata *pdata = dev_get_platdata(&i2c->dev);
+	const struct of_device_id *of_id;
+	struct wm831x *wm831x;
+	enum wm831x_parent type;
+	int ret;
+
+	if (i2c->dev.of_node) {
+		of_id = of_match_device(wm831x_of_match, &i2c->dev);
+		if (!of_id) {
+			dev_err(&i2c->dev, "Failed to match device\n");
+			return -ENODEV;
+		}
+		type = (uintptr_t)of_id->data;
+	} else {
+		type = (enum wm831x_parent)id->driver_data;
+	}
+
+	wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL);
+	if (wm831x == NULL)
+		return -ENOMEM;
+
+	i2c_set_clientdata(i2c, wm831x);
+	wm831x->dev = &i2c->dev;
+	wm831x->type = type;
+
+	wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config);
+	if (IS_ERR(wm831x->regmap)) {
+		ret = PTR_ERR(wm831x->regmap);
+		dev_err(wm831x->dev, "Failed to allocate register map: %d\n",
+			ret);
+		return ret;
+	}
+
+	if (pdata)
+		memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
+
+	return wm831x_device_init(wm831x, i2c->irq);
+}
+
+static int wm831x_i2c_suspend(struct device *dev)
+{
+	struct wm831x *wm831x = dev_get_drvdata(dev);
+
+	return wm831x_device_suspend(wm831x);
+}
+
+static int wm831x_i2c_poweroff(struct device *dev)
+{
+	struct wm831x *wm831x = dev_get_drvdata(dev);
+
+	wm831x_device_shutdown(wm831x);
+
+	return 0;
+}
+
+static const struct i2c_device_id wm831x_i2c_id[] = {
+	{ "wm8310", WM8310 },
+	{ "wm8311", WM8311 },
+	{ "wm8312", WM8312 },
+	{ "wm8320", WM8320 },
+	{ "wm8321", WM8321 },
+	{ "wm8325", WM8325 },
+	{ "wm8326", WM8326 },
+	{ }
+};
+
+static const struct dev_pm_ops wm831x_pm_ops = {
+	.suspend = wm831x_i2c_suspend,
+	.poweroff = wm831x_i2c_poweroff,
+};
+
+static struct i2c_driver wm831x_i2c_driver = {
+	.driver = {
+		.name = "wm831x",
+		.pm = &wm831x_pm_ops,
+		.of_match_table = of_match_ptr(wm831x_of_match),
+		.suppress_bind_attrs = true,
+	},
+	.probe = wm831x_i2c_probe,
+	.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);