1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de>
4 */
5#include <linux/kernel.h>
6#include <linux/module.h>
7#include <linux/i2c.h>
8#include <linux/of.h>
9
10#include "lan9303.h"
11
12struct lan9303_i2c {
13	struct i2c_client *device;
14	struct lan9303 chip;
15};
16
17static const struct regmap_config lan9303_i2c_regmap_config = {
18	.reg_bits = 8,
19	.val_bits = 32,
20	.reg_stride = 1,
21	.can_multi_write = true,
22	.max_register = 0x0ff, /* address bits 0..1 are not used */
23	.reg_format_endian = REGMAP_ENDIAN_LITTLE,
24
25	.volatile_table = &lan9303_register_set,
26	.wr_table = &lan9303_register_set,
27	.rd_table = &lan9303_register_set,
28
29	.cache_type = REGCACHE_NONE,
30};
31
32static int lan9303_i2c_probe(struct i2c_client *client)
33{
34	struct lan9303_i2c *sw_dev;
35	int ret;
36
37	sw_dev = devm_kzalloc(&client->dev, sizeof(struct lan9303_i2c),
38			      GFP_KERNEL);
39	if (!sw_dev)
40		return -ENOMEM;
41
42	sw_dev->chip.regmap = devm_regmap_init_i2c(client,
43						   &lan9303_i2c_regmap_config);
44	if (IS_ERR(sw_dev->chip.regmap)) {
45		ret = PTR_ERR(sw_dev->chip.regmap);
46		dev_err(&client->dev, "Failed to allocate register map: %d\n",
47			ret);
48		return ret;
49	}
50
51	/* link forward and backward */
52	sw_dev->device = client;
53	i2c_set_clientdata(client, sw_dev);
54	sw_dev->chip.dev = &client->dev;
55
56	sw_dev->chip.ops = &lan9303_indirect_phy_ops;
57
58	ret = lan9303_probe(&sw_dev->chip, client->dev.of_node);
59	if (ret != 0)
60		return ret;
61
62	dev_info(&client->dev, "LAN9303 I2C driver loaded successfully\n");
63
64	return 0;
65}
66
67static void lan9303_i2c_remove(struct i2c_client *client)
68{
69	struct lan9303_i2c *sw_dev = i2c_get_clientdata(client);
70
71	if (!sw_dev)
72		return;
73
74	lan9303_remove(&sw_dev->chip);
75}
76
77static void lan9303_i2c_shutdown(struct i2c_client *client)
78{
79	struct lan9303_i2c *sw_dev = i2c_get_clientdata(client);
80
81	if (!sw_dev)
82		return;
83
84	lan9303_shutdown(&sw_dev->chip);
85
86	i2c_set_clientdata(client, NULL);
87}
88
89/*-------------------------------------------------------------------------*/
90
91static const struct i2c_device_id lan9303_i2c_id[] = {
92	{ "lan9303", 0 },
93	{ /* sentinel */ }
94};
95MODULE_DEVICE_TABLE(i2c, lan9303_i2c_id);
96
97static const struct of_device_id lan9303_i2c_of_match[] = {
98	{ .compatible = "smsc,lan9303-i2c", },
99	{ /* sentinel */ },
100};
101MODULE_DEVICE_TABLE(of, lan9303_i2c_of_match);
102
103static struct i2c_driver lan9303_i2c_driver = {
104	.driver = {
105		.name = "LAN9303_I2C",
106		.of_match_table = lan9303_i2c_of_match,
107	},
108	.probe = lan9303_i2c_probe,
109	.remove = lan9303_i2c_remove,
110	.shutdown = lan9303_i2c_shutdown,
111	.id_table = lan9303_i2c_id,
112};
113module_i2c_driver(lan9303_i2c_driver);
114
115MODULE_AUTHOR("Juergen Borleis <kernel@pengutronix.de>");
116MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in I2C managed mode");
117MODULE_LICENSE("GPL v2");
118