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 {
  34         struct lan9303_i2c *sw_dev;
  35         int ret;
  36
  37         sw_dev = devm_kzalloc(&client->dev, sizeof(struct lan9303_i2c),
  38                               GFP_KERNEL);
  39         if (!sw_dev)
  40                 return -ENOMEM;
  41
  42         sw_dev->chip.regmap = devm_regmap_init_i2c(client,
  43                                                    &lan9303_i2c_regmap_config);
  44         if (IS_ERR(sw_dev->chip.regmap)) {
  45                 ret = PTR_ERR(sw_dev->chip.regmap);
  46                 dev_err(&client->dev, "Failed to allocate register map: %d\n",
  47                         ret);
  48                 return ret;
  49         }
  50
  51         /* link forward and backward */
  52         sw_dev->device = client;
  53         i2c_set_clientdata(client, sw_dev);
  54         sw_dev->chip.dev = &client->dev;
  55
  56         sw_dev->chip.ops = &lan9303_indirect_phy_ops;
  57
  58         ret = lan9303_probe(&sw_dev->chip, client->dev.of_node);
  59         if (ret != 0)
  60                 return ret;
  61
  62         dev_info(&client->dev, "LAN9303 I2C driver loaded successfully\n");
  63
  64         return 0;
  65 }
  66
  67 static void lan9303_i2c_remove(struct i2c_client *client)
  68 {
  69         struct lan9303_i2c *sw_dev = i2c_get_clientdata(client);
  70
  71         if (!sw_dev)
  72                 return;
  73
  74         lan9303_remove(&sw_dev->chip);
  75 }
  76
  77 static void lan9303_i2c_shutdown(struct i2c_client *client)
  78 {
  79         struct lan9303_i2c *sw_dev = i2c_get_clientdata(client);
  80
  81         if (!sw_dev)
  82                 return;
  83
  84         lan9303_shutdown(&sw_dev->chip);
  85
  86         i2c_set_clientdata(client, NULL);
  87 }
  88
  89 /*-------------------------------------------------------------------------*/
  90
  91 static const struct i2c_device_id lan9303_i2c_id[] = {
  92         { "lan9303", 0 },
  93         { /* sentinel */ }
  94 };
  95 MODULE_DEVICE_TABLE(i2c, lan9303_i2c_id);
  96
  97 static const struct of_device_id lan9303_i2c_of_match[] = {
  98         { .compatible = "smsc,lan9303-i2c", },
  99         { /* sentinel */ },
 100 };
 101 MODULE_DEVICE_TABLE(of, lan9303_i2c_of_match);
 102
 103 static struct i2c_driver lan9303_i2c_driver = {
 104         .driver = {
 105                 .name = "LAN9303_I2C",
 106                 .of_match_table = lan9303_i2c_of_match,
 107         },
 108         .probe = lan9303_i2c_probe,
 109         .remove = lan9303_i2c_remove,
 110         .shutdown = lan9303_i2c_shutdown,
 111         .id_table = lan9303_i2c_id,
 112 };
 113 module_i2c_driver(lan9303_i2c_driver);
 114
 115 MODULE_AUTHOR("Juergen Borleis <kernel@pengutronix.de>");
 116 MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in I2C managed mode");
 117 MODULE_LICENSE("GPL v2");