1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Microchip KSZ9477 series register access through I2C
4 *
5 * Copyright (C) 2018-2019 Microchip Technology Inc.
6 */
7
8 #include <linux/i2c.h>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/regmap.h>
12
13 #include "ksz_common.h"
14
15 KSZ_REGMAP_TABLE(ksz9477, not_used, 16, 0, 0);
16
ksz9477_i2c_probe(struct i2c_client * i2c)17 static int ksz9477_i2c_probe(struct i2c_client *i2c)
18 {
19 struct regmap_config rc;
20 struct ksz_device *dev;
21 int i, ret;
22
23 dev = ksz_switch_alloc(&i2c->dev, i2c);
24 if (!dev)
25 return -ENOMEM;
26
27 for (i = 0; i < ARRAY_SIZE(ksz9477_regmap_config); i++) {
28 rc = ksz9477_regmap_config[i];
29 rc.lock_arg = &dev->regmap_mutex;
30 dev->regmap[i] = devm_regmap_init_i2c(i2c, &rc);
31 if (IS_ERR(dev->regmap[i])) {
32 return dev_err_probe(&i2c->dev, PTR_ERR(dev->regmap[i]),
33 "Failed to initialize regmap%i\n",
34 ksz9477_regmap_config[i].val_bits);
35 }
36 }
37
38 if (i2c->dev.platform_data)
39 dev->pdata = i2c->dev.platform_data;
40
41 dev->irq = i2c->irq;
42
43 ret = ksz_switch_register(dev);
44
45 /* Main DSA driver may not be started yet. */
46 if (ret)
47 return ret;
48
49 i2c_set_clientdata(i2c, dev);
50
51 return 0;
52 }
53
ksz9477_i2c_remove(struct i2c_client * i2c)54 static void ksz9477_i2c_remove(struct i2c_client *i2c)
55 {
56 struct ksz_device *dev = i2c_get_clientdata(i2c);
57
58 if (dev)
59 ksz_switch_remove(dev);
60 }
61
ksz9477_i2c_shutdown(struct i2c_client * i2c)62 static void ksz9477_i2c_shutdown(struct i2c_client *i2c)
63 {
64 struct ksz_device *dev = i2c_get_clientdata(i2c);
65
66 if (!dev)
67 return;
68
69 if (dev->dev_ops->reset)
70 dev->dev_ops->reset(dev);
71
72 dsa_switch_shutdown(dev->ds);
73
74 i2c_set_clientdata(i2c, NULL);
75 }
76
77 static const struct i2c_device_id ksz9477_i2c_id[] = {
78 { "ksz9477-switch", 0 },
79 {},
80 };
81
82 MODULE_DEVICE_TABLE(i2c, ksz9477_i2c_id);
83
84 static const struct of_device_id ksz9477_dt_ids[] = {
85 {
86 .compatible = "microchip,ksz9477",
87 .data = &ksz_switch_chips[KSZ9477]
88 },
89 {
90 .compatible = "microchip,ksz9896",
91 .data = &ksz_switch_chips[KSZ9896]
92 },
93 {
94 .compatible = "microchip,ksz9897",
95 .data = &ksz_switch_chips[KSZ9897]
96 },
97 {
98 .compatible = "microchip,ksz9893",
99 .data = &ksz_switch_chips[KSZ9893]
100 },
101 {
102 .compatible = "microchip,ksz9563",
103 .data = &ksz_switch_chips[KSZ9563]
104 },
105 {
106 .compatible = "microchip,ksz8563",
107 .data = &ksz_switch_chips[KSZ8563]
108 },
109 {
110 .compatible = "microchip,ksz9567",
111 .data = &ksz_switch_chips[KSZ9567]
112 },
113 {},
114 };
115 MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
116
117 static struct i2c_driver ksz9477_i2c_driver = {
118 .driver = {
119 .name = "ksz9477-switch",
120 .of_match_table = of_match_ptr(ksz9477_dt_ids),
121 },
122 .probe_new = ksz9477_i2c_probe,
123 .remove = ksz9477_i2c_remove,
124 .shutdown = ksz9477_i2c_shutdown,
125 .id_table = ksz9477_i2c_id,
126 };
127
128 module_i2c_driver(ksz9477_i2c_driver);
129
130 MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
131 MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch I2C access Driver");
132 MODULE_LICENSE("GPL v2");
133