drivers/net/dsa/lan9303_i2c.c

   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
  12 struct lan9303_i2c {
  13         struct i2c_client *device;
  14         struct lan9303 chip;
  15 };
  16
  17 static 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
  32 static 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
  68 static 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
  81 static const struct i2c_device_id lan9303_i2c_id[] = {
  82         { "lan9303", 0 },
  83         { /* sentinel */ }
  84 };
  85 MODULE_DEVICE_TABLE(i2c, lan9303_i2c_id);
  86
  87 static const struct of_device_id lan9303_i2c_of_match[] = {
  88         { .compatible = "smsc,lan9303-i2c", },
  89         { /* sentinel */ },
  90 };
  91 MODULE_DEVICE_TABLE(of, lan9303_i2c_of_match);
  92
  93 static 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 };
 102 module_i2c_driver(lan9303_i2c_driver);
 103
 104 MODULE_AUTHOR("Juergen Borleis <kernel@pengutronix.de>");
 105 MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in I2C managed mode");
 106 MODULE_LICENSE("GPL v2");