summaryrefslogtreecommitdiff
path: root/drivers/staging/greybus/spi.c
blob: 68e8d272db6dc8b22cfa66e6b28fec57a0ebf5a3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
// SPDX-License-Identifier: GPL-2.0
/*
 * SPI bridge PHY driver.
 *
 * Copyright 2014-2016 Google Inc.
 * Copyright 2014-2016 Linaro Ltd.
 */

#include <linux/module.h>
#include <linux/greybus.h>

#include "gbphy.h"
#include "spilib.h"

static struct spilib_ops *spilib_ops;

static int gb_spi_probe(struct gbphy_device *gbphy_dev,
			const struct gbphy_device_id *id)
{
	struct gb_connection *connection;
	int ret;

	connection = gb_connection_create(gbphy_dev->bundle,
					  le16_to_cpu(gbphy_dev->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_spilib_master_init(connection, &gbphy_dev->dev, spilib_ops);
	if (ret)
		goto exit_connection_disable;

	gb_gbphy_set_data(gbphy_dev, connection);

	gbphy_runtime_put_autosuspend(gbphy_dev);
	return 0;

exit_connection_disable:
	gb_connection_disable(connection);
exit_connection_destroy:
	gb_connection_destroy(connection);

	return ret;
}

static void gb_spi_remove(struct gbphy_device *gbphy_dev)
{
	struct gb_connection *connection = gb_gbphy_get_data(gbphy_dev);
	int ret;

	ret = gbphy_runtime_get_sync(gbphy_dev);
	if (ret)
		gbphy_runtime_get_noresume(gbphy_dev);

	gb_spilib_master_exit(connection);
	gb_connection_disable(connection);
	gb_connection_destroy(connection);
}

static const struct gbphy_device_id gb_spi_id_table[] = {
	{ GBPHY_PROTOCOL(GREYBUS_PROTOCOL_SPI) },
	{ },
};
MODULE_DEVICE_TABLE(gbphy, gb_spi_id_table);

static struct gbphy_driver spi_driver = {
	.name		= "spi",
	.probe		= gb_spi_probe,
	.remove		= gb_spi_remove,
	.id_table	= gb_spi_id_table,
};

module_gbphy_driver(spi_driver);
MODULE_LICENSE("GPL v2");