drivers/net/dsa/microchip/ksz9477_i2c.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Microchip KSZ9477 series register access through I2C
   4  *
   5  * Copyright (C) 2018-2019 Microchip Technology Inc.
   6  */
   7
   8 #include <linux/i2c.h>
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/regmap.h>
  12
  13 #include "ksz_common.h"
  14
  15 KSZ_REGMAP_TABLE(ksz9477, not_used, 16, 0, 0);
  16
  17 static int ksz9477_i2c_probe(struct i2c_client *i2c)
  18 {
  19         struct regmap_config rc;
  20         struct ksz_device *dev;
  21         int i, ret;
  22
  23         dev = ksz_switch_alloc(&i2c->dev, i2c);
  24         if (!dev)
  25                 return -ENOMEM;
  26
  27         for (i = 0; i < __KSZ_NUM_REGMAPS; i++) {
  28                 rc = ksz9477_regmap_config[i];
  29                 rc.lock_arg = &dev->regmap_mutex;
  30                 dev->regmap[i] = devm_regmap_init_i2c(i2c, &rc);
  31                 if (IS_ERR(dev->regmap[i])) {
  32                         return dev_err_probe(&i2c->dev, PTR_ERR(dev->regmap[i]),
  33                                              "Failed to initialize regmap%i\n",
  34                                              ksz9477_regmap_config[i].val_bits);
  35                 }
  36         }
  37
  38         if (i2c->dev.platform_data)
  39                 dev->pdata = i2c->dev.platform_data;
  40
  41         dev->irq = i2c->irq;
  42
  43         ret = ksz_switch_register(dev);
  44
  45         /* Main DSA driver may not be started yet. */
  46         if (ret)
  47                 return ret;
  48
  49         i2c_set_clientdata(i2c, dev);
  50
  51         return 0;
  52 }
  53
  54 static void ksz9477_i2c_remove(struct i2c_client *i2c)
  55 {
  56         struct ksz_device *dev = i2c_get_clientdata(i2c);
  57
  58         if (dev)
  59                 ksz_switch_remove(dev);
  60 }
  61
  62 static void ksz9477_i2c_shutdown(struct i2c_client *i2c)
  63 {
  64         struct ksz_device *dev = i2c_get_clientdata(i2c);
  65
  66         if (!dev)
  67                 return;
  68
  69         if (dev->dev_ops->reset)
  70                 dev->dev_ops->reset(dev);
  71
  72         dsa_switch_shutdown(dev->ds);
  73
  74         i2c_set_clientdata(i2c, NULL);
  75 }
  76
  77 static const struct i2c_device_id ksz9477_i2c_id[] = {
  78         { "ksz9477-switch", 0 },
  79         {},
  80 };
  81
  82 MODULE_DEVICE_TABLE(i2c, ksz9477_i2c_id);
  83
  84 static const struct of_device_id ksz9477_dt_ids[] = {
  85         {
  86                 .compatible = "microchip,ksz9477",
  87                 .data = &ksz_switch_chips[KSZ9477]
  88         },
  89         {
  90                 .compatible = "microchip,ksz9896",
  91                 .data = &ksz_switch_chips[KSZ9896]
  92         },
  93         {
  94                 .compatible = "microchip,ksz9897",
  95                 .data = &ksz_switch_chips[KSZ9897]
  96         },
  97         {
  98                 .compatible = "microchip,ksz9893",
  99                 .data = &ksz_switch_chips[KSZ9893]
 100         },
 101         {
 102                 .compatible = "microchip,ksz9563",
 103                 .data = &ksz_switch_chips[KSZ9563]
 104         },
 105         {
 106                 .compatible = "microchip,ksz8563",
 107                 .data = &ksz_switch_chips[KSZ8563]
 108         },
 109         {
 110                 .compatible = "microchip,ksz9567",
 111                 .data = &ksz_switch_chips[KSZ9567]
 112         },
 113         {},
 114 };
 115 MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
 116
 117 static struct i2c_driver ksz9477_i2c_driver = {
 118         .driver = {
 119                 .name   = "ksz9477-switch",
 120                 .of_match_table = ksz9477_dt_ids,
 121         },
 122         .probe = ksz9477_i2c_probe,
 123         .remove = ksz9477_i2c_remove,
 124         .shutdown = ksz9477_i2c_shutdown,
 125         .id_table = ksz9477_i2c_id,
 126 };
 127
 128 module_i2c_driver(ksz9477_i2c_driver);
 129
 130 MODULE_AUTHOR("Tristram Ha <[email protected]>");
 131 MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch I2C access Driver");
 132 MODULE_LICENSE("GPL v2");