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) 2018-2024 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         const struct ksz_chip_data *chip;
  20         struct device *ddev = &i2c->dev;
  21         struct regmap_config rc;
  22         struct ksz_device *dev;
  23         int i, ret;
  24
  25         dev = ksz_switch_alloc(&i2c->dev, i2c);
  26         if (!dev)
  27                 return -ENOMEM;
  28
  29         chip = device_get_match_data(ddev);
  30         if (!chip)
  31                 return -EINVAL;
  32
  33         /* Save chip id to do special initialization when probing. */
  34         dev->chip_id = chip->chip_id;
  35         for (i = 0; i < __KSZ_NUM_REGMAPS; i++) {
  36                 rc = ksz9477_regmap_config[i];
  37                 rc.lock_arg = &dev->regmap_mutex;
  38                 dev->regmap[i] = devm_regmap_init_i2c(i2c, &rc);
  39                 if (IS_ERR(dev->regmap[i])) {
  40                         return dev_err_probe(&i2c->dev, PTR_ERR(dev->regmap[i]),
  41                                              "Failed to initialize regmap%i\n",
  42                                              ksz9477_regmap_config[i].val_bits);
  43                 }
  44         }
  45
  46         if (i2c->dev.platform_data)
  47                 dev->pdata = i2c->dev.platform_data;
  48
  49         dev->irq = i2c->irq;
  50
  51         ret = ksz_switch_register(dev);
  52
  53         /* Main DSA driver may not be started yet. */
  54         if (ret)
  55                 return ret;
  56
  57         i2c_set_clientdata(i2c, dev);
  58
  59         return 0;
  60 }
  61
  62 static void ksz9477_i2c_remove(struct i2c_client *i2c)
  63 {
  64         struct ksz_device *dev = i2c_get_clientdata(i2c);
  65
  66         if (dev)
  67                 ksz_switch_remove(dev);
  68 }
  69
  70 static void ksz9477_i2c_shutdown(struct i2c_client *i2c)
  71 {
  72         struct ksz_device *dev = i2c_get_clientdata(i2c);
  73
  74         if (!dev)
  75                 return;
  76
  77         ksz_switch_shutdown(dev);
  78
  79         i2c_set_clientdata(i2c, NULL);
  80 }
  81
  82 static const struct i2c_device_id ksz9477_i2c_id[] = {
  83         { "ksz9477-switch" },
  84         {}
  85 };
  86
  87 MODULE_DEVICE_TABLE(i2c, ksz9477_i2c_id);
  88
  89 static const struct of_device_id ksz9477_dt_ids[] = {
  90         {
  91                 .compatible = "microchip,ksz9477",
  92                 .data = &ksz_switch_chips[KSZ9477]
  93         },
  94         {
  95                 .compatible = "microchip,ksz9896",
  96                 .data = &ksz_switch_chips[KSZ9896]
  97         },
  98         {
  99                 .compatible = "microchip,ksz9897",
 100                 .data = &ksz_switch_chips[KSZ9897]
 101         },
 102         {
 103                 .compatible = "microchip,ksz9893",
 104                 .data = &ksz_switch_chips[KSZ9893]
 105         },
 106         {
 107                 .compatible = "microchip,ksz9563",
 108                 .data = &ksz_switch_chips[KSZ9563]
 109         },
 110         {
 111                 .compatible = "microchip,ksz8563",
 112                 .data = &ksz_switch_chips[KSZ8563]
 113         },
 114         {
 115                 .compatible = "microchip,ksz8567",
 116                 .data = &ksz_switch_chips[KSZ8567]
 117         },
 118         {
 119                 .compatible = "microchip,ksz9567",
 120                 .data = &ksz_switch_chips[KSZ9567]
 121         },
 122         {
 123                 .compatible = "microchip,lan9646",
 124                 .data = &ksz_switch_chips[LAN9646]
 125         },
 126         {},
 127 };
 128 MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
 129
 130 static DEFINE_SIMPLE_DEV_PM_OPS(ksz_i2c_pm_ops,
 131                                 ksz_switch_suspend, ksz_switch_resume);
 132
 133 static struct i2c_driver ksz9477_i2c_driver = {
 134         .driver = {
 135                 .name   = "ksz9477-switch",
 136                 .of_match_table = ksz9477_dt_ids,
 137                 .pm = &ksz_i2c_pm_ops,
 138         },
 139         .probe = ksz9477_i2c_probe,
 140         .remove = ksz9477_i2c_remove,
 141         .shutdown = ksz9477_i2c_shutdown,
 142         .id_table = ksz9477_i2c_id,
 143 };
 144
 145 module_i2c_driver(ksz9477_i2c_driver);
 146
 147 MODULE_AUTHOR("Tristram Ha <[email protected]>");
 148 MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch I2C access Driver");
 149 MODULE_LICENSE("GPL v2");