ASoC: wcd938x: Add support for wcd938x codec

WCD938x codec is a soundwire based codec that supports AMICs, DMICs,
Headphones, Ear and Aux paths. Add support to enable all device
paths of wcd938x codec.

Change-Id: I81b5e603ef73afba74b8d2274012752f9ca5cb6f
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>

asoc/codecs/wcd938x/wcd938x-slave.c

@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/component.h>
+#include <soc/soundwire.h>
+
+struct wcd938x_slave_priv {
+	struct swr_device *swr_slave;
+};
+
+static int wcd938x_slave_bind(struct device *dev,
+				struct device *master, void *data)
+{
+	int ret = 0;
+	uint8_t devnum = 0;
+	struct swr_device *pdev = to_swr_device(dev);
+
+	ret = swr_get_logical_dev_num(pdev, pdev->addr, &devnum);
+	if (ret) {
+		dev_dbg(&pdev->dev,
+			"%s get devnum %d for dev addr %lx failed\n",
+			__func__, devnum, pdev->addr);
+		return ret;
+	}
+	pdev->dev_num = devnum;
+
+	return ret;
+}
+
+static void wcd938x_slave_unbind(struct device *dev,
+				struct device *master, void *data)
+{
+	struct wcd938x_slave_priv *wcd938x_slave = NULL;
+	struct swr_device *pdev = to_swr_device(dev);
+
+	wcd938x_slave = swr_get_dev_data(pdev);
+	if (!wcd938x_slave) {
+		dev_err(&pdev->dev, "%s: wcd938x_slave is NULL\n", __func__);
+		return;
+	}
+}
+
+static const struct swr_device_id wcd938x_swr_id[] = {
+	{"wcd938x-slave", 0},
+	{}
+};
+
+static const struct of_device_id wcd938x_swr_dt_match[] = {
+	{
+		.compatible = "qcom,wcd938x-slave",
+	},
+	{}
+};
+
+static const struct component_ops wcd938x_slave_comp_ops = {
+	.bind   = wcd938x_slave_bind,
+	.unbind = wcd938x_slave_unbind,
+};
+
+static int wcd938x_swr_probe(struct swr_device *pdev)
+{
+	struct wcd938x_slave_priv *wcd938x_slave = NULL;
+
+	wcd938x_slave = devm_kzalloc(&pdev->dev,
+				sizeof(struct wcd938x_slave_priv), GFP_KERNEL);
+	if (!wcd938x_slave)
+		return -ENOMEM;
+
+	swr_set_dev_data(pdev, wcd938x_slave);
+
+	wcd938x_slave->swr_slave = pdev;
+
+	return component_add(&pdev->dev, &wcd938x_slave_comp_ops);
+}
+
+static int wcd938x_swr_remove(struct swr_device *pdev)
+{
+	component_del(&pdev->dev, &wcd938x_slave_comp_ops);
+	swr_set_dev_data(pdev, NULL);
+	swr_remove_device(pdev);
+
+	return 0;
+}
+
+static struct swr_driver wcd938x_slave_driver = {
+	.driver = {
+		.name = "wcd938x-slave",
+		.owner = THIS_MODULE,
+		.of_match_table = wcd938x_swr_dt_match,
+	},
+	.probe = wcd938x_swr_probe,
+	.remove = wcd938x_swr_remove,
+	.id_table = wcd938x_swr_id,
+};
+
+static int __init wcd938x_slave_init(void)
+{
+	return swr_driver_register(&wcd938x_slave_driver);
+}
+
+static void __exit wcd938x_slave_exit(void)
+{
+	swr_driver_unregister(&wcd938x_slave_driver);
+}
+
+module_init(wcd938x_slave_init);
+module_exit(wcd938x_slave_exit);
+
+MODULE_DESCRIPTION("WCD938X Swr Slave driver");
+MODULE_LICENSE("GPL v2");