net/dsa/lan9303_i2c.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de>
0004  */
0005 #include <linux/kernel.h>
0006 #include <linux/module.h>
0007 #include <linux/i2c.h>
0008 #include <linux/of.h>
0009
0010 #include "lan9303.h"
0011
0012 struct lan9303_i2c {
0013     struct i2c_client *device;
0014     struct lan9303 chip;
0015 };
0016
0017 static const struct regmap_config lan9303_i2c_regmap_config = {
0018     .reg_bits = 8,
0019     .val_bits = 32,
0020     .reg_stride = 1,
0021     .can_multi_write = true,
0022     .max_register = 0x0ff, /* address bits 0..1 are not used */
0023     .reg_format_endian = REGMAP_ENDIAN_LITTLE,
0024
0025     .volatile_table = &lan9303_register_set,
0026     .wr_table = &lan9303_register_set,
0027     .rd_table = &lan9303_register_set,
0028
0029     .cache_type = REGCACHE_NONE,
0030 };
0031
0032 static int lan9303_i2c_probe(struct i2c_client *client,
0033                  const struct i2c_device_id *id)
0034 {
0035     struct lan9303_i2c *sw_dev;
0036     int ret;
0037
0038     sw_dev = devm_kzalloc(&client->dev, sizeof(struct lan9303_i2c),
0039                   GFP_KERNEL);
0040     if (!sw_dev)
0041         return -ENOMEM;
0042
0043     sw_dev->chip.regmap = devm_regmap_init_i2c(client,
0044                            &lan9303_i2c_regmap_config);
0045     if (IS_ERR(sw_dev->chip.regmap)) {
0046         ret = PTR_ERR(sw_dev->chip.regmap);
0047         dev_err(&client->dev, "Failed to allocate register map: %d\n",
0048             ret);
0049         return ret;
0050     }
0051
0052     /* link forward and backward */
0053     sw_dev->device = client;
0054     i2c_set_clientdata(client, sw_dev);
0055     sw_dev->chip.dev = &client->dev;
0056
0057     sw_dev->chip.ops = &lan9303_indirect_phy_ops;
0058
0059     ret = lan9303_probe(&sw_dev->chip, client->dev.of_node);
0060     if (ret != 0)
0061         return ret;
0062
0063     dev_info(&client->dev, "LAN9303 I2C driver loaded successfully\n");
0064
0065     return 0;
0066 }
0067
0068 static int lan9303_i2c_remove(struct i2c_client *client)
0069 {
0070     struct lan9303_i2c *sw_dev = i2c_get_clientdata(client);
0071
0072     if (!sw_dev)
0073         return 0;
0074
0075     lan9303_remove(&sw_dev->chip);
0076
0077     i2c_set_clientdata(client, NULL);
0078
0079     return 0;
0080 }
0081
0082 static void lan9303_i2c_shutdown(struct i2c_client *client)
0083 {
0084     struct lan9303_i2c *sw_dev = i2c_get_clientdata(client);
0085
0086     if (!sw_dev)
0087         return;
0088
0089     lan9303_shutdown(&sw_dev->chip);
0090
0091     i2c_set_clientdata(client, NULL);
0092 }
0093
0094 /*-------------------------------------------------------------------------*/
0095
0096 static const struct i2c_device_id lan9303_i2c_id[] = {
0097     { "lan9303", 0 },
0098     { /* sentinel */ }
0099 };
0100 MODULE_DEVICE_TABLE(i2c, lan9303_i2c_id);
0101
0102 static const struct of_device_id lan9303_i2c_of_match[] = {
0103     { .compatible = "smsc,lan9303-i2c", },
0104     { /* sentinel */ },
0105 };
0106 MODULE_DEVICE_TABLE(of, lan9303_i2c_of_match);
0107
0108 static struct i2c_driver lan9303_i2c_driver = {
0109     .driver = {
0110         .name = "LAN9303_I2C",
0111         .of_match_table = of_match_ptr(lan9303_i2c_of_match),
0112     },
0113     .probe = lan9303_i2c_probe,
0114     .remove = lan9303_i2c_remove,
0115     .shutdown = lan9303_i2c_shutdown,
0116     .id_table = lan9303_i2c_id,
0117 };
0118 module_i2c_driver(lan9303_i2c_driver);
0119
0120 MODULE_AUTHOR("Juergen Borleis <kernel@pengutronix.de>");
0121 MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in I2C managed mode");
0122 MODULE_LICENSE("GPL v2");