greybus: spi: Separate out spilib from spi bridged PHY bundle driver

spilib can be used by multiple bridge drivers implementing different
bundle classes. Separate out bridged PHY bundle drivers parts.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

1 files changed, 75 insertions, 0 deletions

diff --git a/drivers/staging/greybus/spi.c b/drivers/staging/greybus/spi.c
new file mode 100644
index 000000000000..1cf5f509363c
--- /dev/null
+++ b/drivers/staging/greybus/spi.c
@@ -0,0 +1,75 @@
+/*
+ * SPI bridge PHY driver.
+ *
+ * Copyright 2014-2016 Google Inc.
+ * Copyright 2014-2016 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include <linux/module.h>
+
+#include "greybus.h"
+#include "gpbridge.h"
+#include "spilib.h"
+
+static int gb_spi_probe(struct gpbridge_device *gpbdev,
+			const struct gpbridge_device_id *id)
+{
+	struct gb_connection *connection;
+	int ret;
+
+	connection = gb_connection_create(gpbdev->bundle,
+					  le16_to_cpu(gpbdev->cport_desc->id),
+					  NULL);
+	if (IS_ERR(connection))
+		return PTR_ERR(connection);
+
+	ret = gb_connection_enable(connection);
+	if (ret)
+		goto exit_connection_destroy;
+
+	ret = gb_gpbridge_get_version(connection);
+	if (ret)
+		goto exit_connection_disable;
+
+	ret = gb_spilib_master_init(connection, &gpbdev->dev);
+	if (ret)
+		goto exit_connection_disable;
+
+	gb_gpbridge_set_data(gpbdev, connection);
+
+	return 0;
+
+exit_connection_disable:
+	gb_connection_disable(connection);
+exit_connection_destroy:
+	gb_connection_destroy(connection);
+
+	return ret;
+}
+
+static void gb_spi_remove(struct gpbridge_device *gpbdev)
+{
+	struct gb_connection *connection = gb_gpbridge_get_data(gpbdev);
+
+	gb_spilib_master_exit(connection);
+	gb_connection_disable(connection);
+	gb_connection_destroy(connection);
+}
+
+static const struct gpbridge_device_id gb_spi_id_table[] = {
+	{ GPBRIDGE_PROTOCOL(GREYBUS_PROTOCOL_SPI) },
+	{ },
+};
+MODULE_DEVICE_TABLE(gpbridge, gb_spi_id_table);
+
+static struct gpbridge_driver spi_driver = {
+	.name		= "spi",
+	.probe		= gb_spi_probe,
+	.remove		= gb_spi_remove,
+	.id_table	= gb_spi_id_table,
+};
+
+module_gpbridge_driver(spi_driver);
+MODULE_LICENSE("GPL v2");