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			     const struct i2c_device_id *id)
34{
35	struct lan9303_i2c *sw_dev;
36	int ret;
37
38	sw_dev = devm_kzalloc(&client->dev, sizeof(struct lan9303_i2c),
39			      GFP_KERNEL);
40	if (!sw_dev)
41		return -ENOMEM;
42
43	sw_dev->chip.regmap = devm_regmap_init_i2c(client,
44						   &lan9303_i2c_regmap_config);
45	if (IS_ERR(sw_dev->chip.regmap)) {
46		ret = PTR_ERR(sw_dev->chip.regmap);
47		dev_err(&client->dev, "Failed to allocate register map: %d\n",
48			ret);
49		return ret;
50	}
51
52	/* link forward and backward */
53	sw_dev->device = client;
54	i2c_set_clientdata(client, sw_dev);
55	sw_dev->chip.dev = &client->dev;
56
57	sw_dev->chip.ops = &lan9303_indirect_phy_ops;
58
59	ret = lan9303_probe(&sw_dev->chip, client->dev.of_node);
60	if (ret != 0)
61		return ret;
62
63	dev_info(&client->dev, "LAN9303 I2C driver loaded successfully\n");
64
65	return 0;
66}
67
68static int lan9303_i2c_remove(struct i2c_client *client)
69{
70	struct lan9303_i2c *sw_dev;
71
72	sw_dev = i2c_get_clientdata(client);
73	if (!sw_dev)
74		return -ENODEV;
75
76	return lan9303_remove(&sw_dev->chip);
77}
78
79/*-------------------------------------------------------------------------*/
80
81static const struct i2c_device_id lan9303_i2c_id[] = {
82	{ "lan9303", 0 },
83	{ /* sentinel */ }
84};
85MODULE_DEVICE_TABLE(i2c, lan9303_i2c_id);
86
87static const struct of_device_id lan9303_i2c_of_match[] = {
88	{ .compatible = "smsc,lan9303-i2c", },
89	{ /* sentinel */ },
90};
91MODULE_DEVICE_TABLE(of, lan9303_i2c_of_match);
92
93static struct i2c_driver lan9303_i2c_driver = {
94	.driver = {
95		.name = "LAN9303_I2C",
96		.of_match_table = of_match_ptr(lan9303_i2c_of_match),
97	},
98	.probe = lan9303_i2c_probe,
99	.remove = lan9303_i2c_remove,
100	.id_table = lan9303_i2c_id,
101};
102module_i2c_driver(lan9303_i2c_driver);
103
104MODULE_AUTHOR("Juergen Borleis <kernel@pengutronix.de>");
105MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in I2C managed mode");
106MODULE_LICENSE("GPL v2");
107