drivers/net/dsa/lan9303_i2c.c

   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
  21 struct lan9303_i2c {
  22         struct i2c_client *device;
  23         struct lan9303 chip;
  24 };
  25
  26 static 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
  41 static 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         ret = lan9303_probe(&sw_dev->chip, client->dev.of_node);
  67         if (ret != 0)
  68                 return ret;
  69
  70         dev_info(&client->dev, "LAN9303 I2C driver loaded successfully\n");
  71
  72         return 0;
  73 }
  74
  75 static int lan9303_i2c_remove(struct i2c_client *client)
  76 {
  77         struct lan9303_i2c *sw_dev;
  78
  79         sw_dev = i2c_get_clientdata(client);
  80         if (!sw_dev)
  81                 return -ENODEV;
  82
  83         return lan9303_remove(&sw_dev->chip);
  84 }
  85
  86 /*-------------------------------------------------------------------------*/
  87
  88 static const struct i2c_device_id lan9303_i2c_id[] = {
  89         { "lan9303", 0 },
  90         { /* sentinel */ }
  91 };
  92 MODULE_DEVICE_TABLE(i2c, lan9303_i2c_id);
  93
  94 static const struct of_device_id lan9303_i2c_of_match[] = {
  95         { .compatible = "smsc,lan9303-i2c", },
  96         { /* sentinel */ },
  97 };
  98 MODULE_DEVICE_TABLE(of, lan9303_i2c_of_match);
  99
 100 static struct i2c_driver lan9303_i2c_driver = {
 101         .driver = {
 102                 .name = "LAN9303_I2C",
 103                 .of_match_table = of_match_ptr(lan9303_i2c_of_match),
 104         },
 105         .probe = lan9303_i2c_probe,
 106         .remove = lan9303_i2c_remove,
 107         .id_table = lan9303_i2c_id,
 108 };
 109 module_i2c_driver(lan9303_i2c_driver);
 110
 111 MODULE_AUTHOR("Juergen Borleis <kernel@pengutronix.de>");
 112 MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in I2C managed mode");
 113 MODULE_LICENSE("GPL v2");