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
12 struct lan9303_i2c {
13 struct i2c_client *device;
14 struct lan9303 chip;
15 };
16
17 static 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
lan9303_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)32 static 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
lan9303_i2c_remove(struct i2c_client * client)68 static void lan9303_i2c_remove(struct i2c_client *client)
69 {
70 struct lan9303_i2c *sw_dev = i2c_get_clientdata(client);
71
72 if (!sw_dev)
73 return;
74
75 lan9303_remove(&sw_dev->chip);
76 }
77
lan9303_i2c_shutdown(struct i2c_client * client)78 static void lan9303_i2c_shutdown(struct i2c_client *client)
79 {
80 struct lan9303_i2c *sw_dev = i2c_get_clientdata(client);
81
82 if (!sw_dev)
83 return;
84
85 lan9303_shutdown(&sw_dev->chip);
86
87 i2c_set_clientdata(client, NULL);
88 }
89
90 /*-------------------------------------------------------------------------*/
91
92 static const struct i2c_device_id lan9303_i2c_id[] = {
93 { "lan9303", 0 },
94 { /* sentinel */ }
95 };
96 MODULE_DEVICE_TABLE(i2c, lan9303_i2c_id);
97
98 static const struct of_device_id lan9303_i2c_of_match[] = {
99 { .compatible = "smsc,lan9303-i2c", },
100 { /* sentinel */ },
101 };
102 MODULE_DEVICE_TABLE(of, lan9303_i2c_of_match);
103
104 static struct i2c_driver lan9303_i2c_driver = {
105 .driver = {
106 .name = "LAN9303_I2C",
107 .of_match_table = of_match_ptr(lan9303_i2c_of_match),
108 },
109 .probe = lan9303_i2c_probe,
110 .remove = lan9303_i2c_remove,
111 .shutdown = lan9303_i2c_shutdown,
112 .id_table = lan9303_i2c_id,
113 };
114 module_i2c_driver(lan9303_i2c_driver);
115
116 MODULE_AUTHOR("Juergen Borleis <kernel@pengutronix.de>");
117 MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in I2C managed mode");
118 MODULE_LICENSE("GPL v2");
119