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	ksz_switch_remove(dev);
 60
 61	return 0;
 62}
 63
 64static void ksz9477_i2c_shutdown(struct i2c_client *i2c)
 65{
 66	struct ksz_device *dev = i2c_get_clientdata(i2c);
 67
 68	if (dev && dev->dev_ops->shutdown)
 69		dev->dev_ops->shutdown(dev);
 70}
 71
 72static const struct i2c_device_id ksz9477_i2c_id[] = {
 73	{ "ksz9477-switch", 0 },
 74	{},
 75};
 76
 77MODULE_DEVICE_TABLE(i2c, ksz9477_i2c_id);
 78
 79static const struct of_device_id ksz9477_dt_ids[] = {
 80	{ .compatible = "microchip,ksz9477" },
 81	{ .compatible = "microchip,ksz9897" },
 82	{ .compatible = "microchip,ksz9567" },
 83	{},
 84};
 85MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
 86
 87static struct i2c_driver ksz9477_i2c_driver = {
 88	.driver = {
 89		.name	= "ksz9477-switch",
 90		.owner	= THIS_MODULE,
 91		.of_match_table = of_match_ptr(ksz9477_dt_ids),
 92	},
 93	.probe	= ksz9477_i2c_probe,
 94	.remove	= ksz9477_i2c_remove,
 95	.shutdown = ksz9477_i2c_shutdown,
 96	.id_table = ksz9477_i2c_id,
 97};
 98
 99module_i2c_driver(ksz9477_i2c_driver);
100
101MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
102MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch I2C access Driver");
103MODULE_LICENSE("GPL v2");