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 
17 static 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 
55 static 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 
67 static 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 
82 static const struct i2c_device_id ksz9477_i2c_id[] = {
83 	{ "ksz9477-switch", 0 },
84 	{},
85 };
86 
87 MODULE_DEVICE_TABLE(i2c, ksz9477_i2c_id);
88 
89 static 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 	{ .compatible = "microchip,ksz8563" },
96 	{},
97 };
98 MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
99 
100 static struct i2c_driver ksz9477_i2c_driver = {
101 	.driver = {
102 		.name	= "ksz9477-switch",
103 		.of_match_table = of_match_ptr(ksz9477_dt_ids),
104 	},
105 	.probe	= ksz9477_i2c_probe,
106 	.remove	= ksz9477_i2c_remove,
107 	.shutdown = ksz9477_i2c_shutdown,
108 	.id_table = ksz9477_i2c_id,
109 };
110 
111 module_i2c_driver(ksz9477_i2c_driver);
112 
113 MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
114 MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch I2C access Driver");
115 MODULE_LICENSE("GPL v2");
116