1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de>
  4 */
  5#include <linux/kernel.h>
  6#include <linux/module.h>
  7#include <linux/i2c.h>
  8#include <linux/of.h>
  9
 10#include "lan9303.h"
 11
 12struct lan9303_i2c {
 13	struct i2c_client *device;
 14	struct lan9303 chip;
 15};
 16
 17static const struct regmap_config lan9303_i2c_regmap_config = {
 18	.reg_bits = 8,
 19	.val_bits = 32,
 20	.reg_stride = 1,
 21	.can_multi_write = true,
 22	.max_register = 0x0ff, /* address bits 0..1 are not used */
 23	.reg_format_endian = REGMAP_ENDIAN_LITTLE,
 24
 25	.volatile_table = &lan9303_register_set,
 26	.wr_table = &lan9303_register_set,
 27	.rd_table = &lan9303_register_set,
 28
 29	.cache_type = REGCACHE_NONE,
 30};
 31
 32static int lan9303_i2c_probe(struct i2c_client *client,
 33			     const struct i2c_device_id *id)
 34{
 35	struct lan9303_i2c *sw_dev;
 36	int ret;
 37
 38	sw_dev = devm_kzalloc(&client->dev, sizeof(struct lan9303_i2c),
 39			      GFP_KERNEL);
 40	if (!sw_dev)
 41		return -ENOMEM;
 42
 43	sw_dev->chip.regmap = devm_regmap_init_i2c(client,
 44						   &lan9303_i2c_regmap_config);
 45	if (IS_ERR(sw_dev->chip.regmap)) {
 46		ret = PTR_ERR(sw_dev->chip.regmap);
 47		dev_err(&client->dev, "Failed to allocate register map: %d\n",
 48			ret);
 49		return ret;
 50	}
 51
 52	/* link forward and backward */
 53	sw_dev->device = client;
 54	i2c_set_clientdata(client, sw_dev);
 55	sw_dev->chip.dev = &client->dev;
 56
 57	sw_dev->chip.ops = &lan9303_indirect_phy_ops;
 58
 59	ret = lan9303_probe(&sw_dev->chip, client->dev.of_node);
 60	if (ret != 0)
 61		return ret;
 62
 63	dev_info(&client->dev, "LAN9303 I2C driver loaded successfully\n");
 64
 65	return 0;
 66}
 67
 68static int lan9303_i2c_remove(struct i2c_client *client)
 69{
 70	struct lan9303_i2c *sw_dev;
 71
 72	sw_dev = i2c_get_clientdata(client);
 73	if (!sw_dev)
 74		return -ENODEV;
 75
 76	return lan9303_remove(&sw_dev->chip);
 77}
 78
 79/*-------------------------------------------------------------------------*/
 80
 81static const struct i2c_device_id lan9303_i2c_id[] = {
 82	{ "lan9303", 0 },
 83	{ /* sentinel */ }
 84};
 85MODULE_DEVICE_TABLE(i2c, lan9303_i2c_id);
 86
 87static const struct of_device_id lan9303_i2c_of_match[] = {
 88	{ .compatible = "smsc,lan9303-i2c", },
 89	{ /* sentinel */ },
 90};
 91MODULE_DEVICE_TABLE(of, lan9303_i2c_of_match);
 92
 93static struct i2c_driver lan9303_i2c_driver = {
 94	.driver = {
 95		.name = "LAN9303_I2C",
 96		.of_match_table = of_match_ptr(lan9303_i2c_of_match),
 97	},
 98	.probe = lan9303_i2c_probe,
 99	.remove = lan9303_i2c_remove,
100	.id_table = lan9303_i2c_id,
101};
102module_i2c_driver(lan9303_i2c_driver);
103
104MODULE_AUTHOR("Juergen Borleis <kernel@pengutronix.de>");
105MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in I2C managed mode");
106MODULE_LICENSE("GPL v2");