tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
15KSZ_REGMAP_TABLE(ksz9477, not_used, 16, 0, 0);
16
17static int ksz9477_i2c_probe(struct i2c_client *i2c,
18 const struct i2c_device_id *i2c_id)
19{
20 struct regmap_config rc;
21 struct ksz_device *dev;
22 int i, ret;
23
24 dev = ksz_switch_alloc(&i2c->dev, i2c);
25 if (!dev)
26 return -ENOMEM;
27
28 for (i = 0; i < ARRAY_SIZE(ksz9477_regmap_config); i++) {
29 rc = ksz9477_regmap_config[i];
30 rc.lock_arg = &dev->regmap_mutex;
31 dev->regmap[i] = devm_regmap_init_i2c(i2c, &rc);
32 if (IS_ERR(dev->regmap[i])) {
33 ret = PTR_ERR(dev->regmap[i]);
34 dev_err(&i2c->dev,
35 "Failed to initialize regmap%i: %d\n",
36 ksz9477_regmap_config[i].val_bits, ret);
37 return ret;
38 }
39 }
40
41 if (i2c->dev.platform_data)
42 dev->pdata = i2c->dev.platform_data;
43
44 ret = ksz9477_switch_register(dev);
45
46 /* Main DSA driver may not be started yet. */
47 if (ret)
48 return ret;
49
50 i2c_set_clientdata(i2c, dev);
51
52 return 0;
53}
54
55static int ksz9477_i2c_remove(struct i2c_client *i2c)
56{
57 struct ksz_device *dev = i2c_get_clientdata(i2c);
58
59 if (dev)
60 ksz_switch_remove(dev);
61
62 i2c_set_clientdata(i2c, NULL);
63
64 return 0;
65}
66
67static void ksz9477_i2c_shutdown(struct i2c_client *i2c)
68{
69 struct ksz_device *dev = i2c_get_clientdata(i2c);
70
71 if (!dev)
72 return;
73
74 if (dev->dev_ops->shutdown)
75 dev->dev_ops->shutdown(dev);
76
77 dsa_switch_shutdown(dev->ds);
78
79 i2c_set_clientdata(i2c, NULL);
80}
81
82static const struct i2c_device_id ksz9477_i2c_id[] = {
83 { "ksz9477-switch", 0 },
84 {},
85};
86
87MODULE_DEVICE_TABLE(i2c, ksz9477_i2c_id);
88
89static const struct of_device_id ksz9477_dt_ids[] = {
90 { .compatible = "microchip,ksz9477" },
91 { .compatible = "microchip,ksz9897" },
92 { .compatible = "microchip,ksz9893" },
93 { .compatible = "microchip,ksz9563" },
94 { .compatible = "microchip,ksz9567" },
95 {},
96};
97MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
98
99static struct i2c_driver ksz9477_i2c_driver = {
100 .driver = {
101 .name = "ksz9477-switch",
102 .of_match_table = of_match_ptr(ksz9477_dt_ids),
103 },
104 .probe = ksz9477_i2c_probe,
105 .remove = ksz9477_i2c_remove,
106 .shutdown = ksz9477_i2c_shutdown,
107 .id_table = ksz9477_i2c_id,
108};
109
110module_i2c_driver(ksz9477_i2c_driver);
111
112MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
113MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch I2C access Driver");
114MODULE_LICENSE("GPL v2");