net: cnss platform driver for SDIO WLAN module

This platform driver adds support for the CNSS connectivity
subsystem used for SDIO based WiFi devices.

CRs-Fixed: 944601
Change-Id: I8193b73815a8667c9ef4b7d2a87f61f7f3c090fe
Signed-off-by: Komal Seelam <kseelam@codeaurora.org>
Signed-off-by: Sarada Prasanna Garnayak <sgarna@codeaurora.org>

Documentation/devicetree/bindings/cnss/cnss-sdio-wlan.txt

@@ -0,0 +1,13 @@
+* Qualcomm Technologies Inc Connectivity SubSystem Platform Driver
+
+This platform driver adds support for the CNSS subsystem used for SDIO
+based Wi-Fi devices. The main purpose of this device tree entry below
+is to invoke the CNSS SDIO platform driver.
+
+Required properties:
+- compatible	: "qcom,cnss_sdio"
+
+Example:
+	qcom,cnss-sdio {
+		compatible = "qcom,cnss_sdio";
+	};

drivers/net/wireless/Kconfig

@@ -311,6 +311,17 @@ config CNSS
 	  This driver also adds support to integrate PCIe WLAN module to subsystem
 	  restart framework.
 
+config CNSS_SDIO
+	tristate "Flag to enable platform driver for SIDO based wifi device"
+	depends on MMC_SDHCI
+	depends on MMC_SDHCI_MSM
+	---help---
+	  This module specifies whether CNSS Platform Driver supports SDIO.
+	  This flag needs to be disabled if CNSS platform Driver need to be
+	  supported for other buses.
+	  This Flag is used by CLD Driver to use the SDIO GPL API's through
+	  CNSS Platform Driver.
+
 config CNSS_SECURE_FW
 	bool "Enable/Disable Memory Allocation for Secure Firmware Feature"
 	depends on CNSS

drivers/net/wireless/Makefile

@@ -60,5 +60,6 @@ obj-$(CONFIG_BRCMSMAC)	+= brcm80211/
 
 obj-$(CONFIG_LIBRA_SDIOIF)	+= libra/
 obj-$(CONFIG_WCNSS_CORE)	+= wcnss/
+obj-$(CONFIG_CNSS_SDIO)		+= cnss/cnss_sdio.o
 obj-$(CONFIG_CNSS)		+= cnss/
 obj-$(CONFIG_WCNSS_MEM_PRE_ALLOC) += cnss_prealloc/

drivers/net/wireless/cnss/cnss_sdio.c

@@ -0,0 +1,59 @@
+/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+static int cnss_sdio_probe(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static int cnss_sdio_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static const struct of_device_id cnss_sdio_dt_match[] = {
+	{.compatible = "qcom,cnss_sdio"},
+	{}
+};
+MODULE_DEVICE_TABLE(of, cnss_sdio_dt_match);
+
+static struct platform_driver cnss_sdio_driver = {
+	.probe  = cnss_sdio_probe,
+	.remove = cnss_sdio_remove,
+	.driver = {
+		.name = "cnss_sdio",
+		.owner = THIS_MODULE,
+		.of_match_table = cnss_sdio_dt_match,
+	},
+};
+
+static int __init cnss_sdio_init(void)
+{
+	return platform_driver_register(&cnss_sdio_driver);
+}
+
+static void __exit cnss_sdio_exit(void)
+{
+	platform_driver_unregister(&cnss_sdio_driver);
+}
+
+module_init(cnss_sdio_init);
+module_exit(cnss_sdio_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION(DEVICE "CNSS SDIO Driver");