LXR linux/drivers/net/dsa/lan9303

   1/*
   2 * Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de>
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of the GNU General Public License
   6 * version 2, as published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 *
  13 */
  14#include <linux/kernel.h>
  15#include <linux/module.h>
  16#include <linux/i2c.h>
  17#include <linux/of.h>
  18
  19#include "lan9303.h"
  20
  21struct lan9303_i2c {
  22        struct i2c_client *device;
  23        struct lan9303 chip;
  24};
  25
  26static const struct regmap_config lan9303_i2c_regmap_config = {
  27        .reg_bits = 8,
  28        .val_bits = 32,
  29        .reg_stride = 1,
  30        .can_multi_write = true,
  31        .max_register = 0x0ff, /* address bits 0..1 are not used */
  32        .reg_format_endian = REGMAP_ENDIAN_LITTLE,
  33
  34        .volatile_table = &lan9303_register_set,
  35        .wr_table = &lan9303_register_set,
  36        .rd_table = &lan9303_register_set,
  37
  38        .cache_type = REGCACHE_NONE,
  39};
  40
  41static int lan9303_i2c_probe(struct i2c_client *client,
  42                             const struct i2c_device_id *id)
  43{
  44        struct lan9303_i2c *sw_dev;
  45        int ret;
  46
  47        sw_dev = devm_kzalloc(&client->dev, sizeof(struct lan9303_i2c),
  48                              GFP_KERNEL);
  49        if (!sw_dev)
  50                return -ENOMEM;
  51
  52        sw_dev->chip.regmap = devm_regmap_init_i2c(client,
  53                                                   &lan9303_i2c_regmap_config);
  54        if (IS_ERR(sw_dev->chip.regmap)) {
  55                ret = PTR_ERR(sw_dev->chip.regmap);
  56                dev_err(&client->dev, "Failed to allocate register map: %d\n",
  57                        ret);
  58                return ret;
  59        }
  60
  61        /* link forward and backward */
  62        sw_dev->device = client;
  63        i2c_set_clientdata(client, sw_dev);
  64        sw_dev->chip.dev = &client->dev;
  65
  66        sw_dev->chip.ops = &lan9303_indirect_phy_ops;
  67
  68        ret = lan9303_probe(&sw_dev->chip, client->dev.of_node);
  69        if (ret != 0)
  70                return ret;
  71
  72        dev_info(&client->dev, "LAN9303 I2C driver loaded successfully\n");
  73
  74        return 0;
  75}
  76
  77static int lan9303_i2c_remove(struct i2c_client *client)
  78{
  79        struct lan9303_i2c *sw_dev;
  80
  81        sw_dev = i2c_get_clientdata(client);
  82        if (!sw_dev)
  83                return -ENODEV;
  84
  85        return lan9303_remove(&sw_dev->chip);
  86}
  87
  88/*-------------------------------------------------------------------------*/
  89
  90static const struct i2c_device_id lan9303_i2c_id[] = {
  91        { "lan9303", 0 },
  92        { /* sentinel */ }
  93};
  94MODULE_DEVICE_TABLE(i2c, lan9303_i2c_id);
  95
  96static const struct of_device_id lan9303_i2c_of_match[] = {
  97        { .compatible = "smsc,lan9303-i2c", },
  98        { /* sentinel */ },
  99};
 100MODULE_DEVICE_TABLE(of, lan9303_i2c_of_match);
 101
 102static struct i2c_driver lan9303_i2c_driver = {
 103        .driver = {
 104                .name = "LAN9303_I2C",
 105                .of_match_table = of_match_ptr(lan9303_i2c_of_match),
 106        },
 107        .probe = lan9303_i2c_probe,
 108        .remove = lan9303_i2c_remove,
 109        .id_table = lan9303_i2c_id,
 110};
 111module_i2c_driver(lan9303_i2c_driver);
 112
 113MODULE_AUTHOR("Juergen Borleis <kernel@pengutronix.de>");
 114MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in I2C managed mode");
 115MODULE_LICENSE("GPL v2");
 116