1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Microchip KSZ9477 series register access through I2C
  4 *
  5 * Copyright (C) 2018-2024 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{
 19	const struct ksz_chip_data *chip;
 20	struct device *ddev = &i2c->dev;
 21	struct regmap_config rc;
 22	struct ksz_device *dev;
 23	int i, ret;
 24
 25	dev = ksz_switch_alloc(&i2c->dev, i2c);
 26	if (!dev)
 27		return -ENOMEM;
 28
 29	chip = device_get_match_data(ddev);
 30	if (!chip)
 31		return -EINVAL;
 32
 33	/* Save chip id to do special initialization when probing. */
 34	dev->chip_id = chip->chip_id;
 35	for (i = 0; i < __KSZ_NUM_REGMAPS; i++) {
 36		rc = ksz9477_regmap_config[i];
 37		rc.lock_arg = &dev->regmap_mutex;
 38		dev->regmap[i] = devm_regmap_init_i2c(i2c, &rc);
 39		if (IS_ERR(dev->regmap[i])) {
 40			return dev_err_probe(&i2c->dev, PTR_ERR(dev->regmap[i]),
 41					     "Failed to initialize regmap%i\n",
 42					     ksz9477_regmap_config[i].val_bits);
 43		}
 44	}
 45
 46	if (i2c->dev.platform_data)
 47		dev->pdata = i2c->dev.platform_data;
 48
 49	dev->irq = i2c->irq;
 50
 51	ret = ksz_switch_register(dev);
 52
 53	/* Main DSA driver may not be started yet. */
 54	if (ret)
 55		return ret;
 56
 57	i2c_set_clientdata(i2c, dev);
 58
 59	return 0;
 60}
 61
 62static void ksz9477_i2c_remove(struct i2c_client *i2c)
 63{
 64	struct ksz_device *dev = i2c_get_clientdata(i2c);
 65
 66	if (dev)
 67		ksz_switch_remove(dev);
 68}
 69
 70static void ksz9477_i2c_shutdown(struct i2c_client *i2c)
 71{
 72	struct ksz_device *dev = i2c_get_clientdata(i2c);
 73
 74	if (!dev)
 75		return;
 76
 77	ksz_switch_shutdown(dev);
 78
 79	i2c_set_clientdata(i2c, NULL);
 80}
 81
 82static const struct i2c_device_id ksz9477_i2c_id[] = {
 83	{ "ksz9477-switch" },
 84	{}
 85};
 86
 87MODULE_DEVICE_TABLE(i2c, ksz9477_i2c_id);
 88
 89static const struct of_device_id ksz9477_dt_ids[] = {
 90	{
 91		.compatible = "microchip,ksz9477",
 92		.data = &ksz_switch_chips[KSZ9477]
 93	},
 94	{
 95		.compatible = "microchip,ksz9896",
 96		.data = &ksz_switch_chips[KSZ9896]
 97	},
 98	{
 99		.compatible = "microchip,ksz9897",
100		.data = &ksz_switch_chips[KSZ9897]
101	},
102	{
103		.compatible = "microchip,ksz9893",
104		.data = &ksz_switch_chips[KSZ9893]
105	},
106	{
107		.compatible = "microchip,ksz9563",
108		.data = &ksz_switch_chips[KSZ9563]
109	},
110	{
111		.compatible = "microchip,ksz8563",
112		.data = &ksz_switch_chips[KSZ8563]
113	},
114	{
115		.compatible = "microchip,ksz8567",
116		.data = &ksz_switch_chips[KSZ8567]
117	},
118	{
119		.compatible = "microchip,ksz9567",
120		.data = &ksz_switch_chips[KSZ9567]
121	},
122	{
123		.compatible = "microchip,lan9646",
124		.data = &ksz_switch_chips[LAN9646]
125	},
126	{},
127};
128MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
129
130static struct i2c_driver ksz9477_i2c_driver = {
131	.driver = {
132		.name	= "ksz9477-switch",
133		.of_match_table = ksz9477_dt_ids,
134	},
135	.probe = ksz9477_i2c_probe,
136	.remove	= ksz9477_i2c_remove,
137	.shutdown = ksz9477_i2c_shutdown,
138	.id_table = ksz9477_i2c_id,
139};
140
141module_i2c_driver(ksz9477_i2c_driver);
142
143MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
144MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch I2C access Driver");
145MODULE_LICENSE("GPL v2");