1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * SPI bridge PHY driver.
4  *
5  * Copyright 2014-2016 Google Inc.
6  * Copyright 2014-2016 Linaro Ltd.
7  */
8 
9 #include <linux/module.h>
10 #include <linux/greybus.h>
11 
12 #include "gbphy.h"
13 #include "spilib.h"
14 
15 static struct spilib_ops *spilib_ops;
16 
gb_spi_probe(struct gbphy_device * gbphy_dev,const struct gbphy_device_id * id)17 static int gb_spi_probe(struct gbphy_device *gbphy_dev,
18 			const struct gbphy_device_id *id)
19 {
20 	struct gb_connection *connection;
21 	int ret;
22 
23 	connection = gb_connection_create(gbphy_dev->bundle,
24 					  le16_to_cpu(gbphy_dev->cport_desc->id),
25 					  NULL);
26 	if (IS_ERR(connection))
27 		return PTR_ERR(connection);
28 
29 	ret = gb_connection_enable(connection);
30 	if (ret)
31 		goto exit_connection_destroy;
32 
33 	ret = gb_spilib_master_init(connection, &gbphy_dev->dev, spilib_ops);
34 	if (ret)
35 		goto exit_connection_disable;
36 
37 	gb_gbphy_set_data(gbphy_dev, connection);
38 
39 	gbphy_runtime_put_autosuspend(gbphy_dev);
40 	return 0;
41 
42 exit_connection_disable:
43 	gb_connection_disable(connection);
44 exit_connection_destroy:
45 	gb_connection_destroy(connection);
46 
47 	return ret;
48 }
49 
gb_spi_remove(struct gbphy_device * gbphy_dev)50 static void gb_spi_remove(struct gbphy_device *gbphy_dev)
51 {
52 	struct gb_connection *connection = gb_gbphy_get_data(gbphy_dev);
53 	int ret;
54 
55 	ret = gbphy_runtime_get_sync(gbphy_dev);
56 	if (ret)
57 		gbphy_runtime_get_noresume(gbphy_dev);
58 
59 	gb_spilib_master_exit(connection);
60 	gb_connection_disable(connection);
61 	gb_connection_destroy(connection);
62 }
63 
64 static const struct gbphy_device_id gb_spi_id_table[] = {
65 	{ GBPHY_PROTOCOL(GREYBUS_PROTOCOL_SPI) },
66 	{ },
67 };
68 MODULE_DEVICE_TABLE(gbphy, gb_spi_id_table);
69 
70 static struct gbphy_driver spi_driver = {
71 	.name		= "spi",
72 	.probe		= gb_spi_probe,
73 	.remove		= gb_spi_remove,
74 	.id_table	= gb_spi_id_table,
75 };
76 
77 module_gbphy_driver(spi_driver);
78 MODULE_LICENSE("GPL v2");
79