net/atm/atm_sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* ATM driver model support. */
   3
   4 #include <linux/kernel.h>
   5 #include <linux/slab.h>
   6 #include <linux/init.h>
   7 #include <linux/kobject.h>
   8 #include <linux/atmdev.h>
   9 #include "common.h"
  10 #include "resources.h"
  11
  12 #define to_atm_dev(cldev) container_of(cldev, struct atm_dev, class_dev)
  13
  14 static ssize_t show_type(struct device *cdev,
  15                          struct device_attribute *attr, char *buf)
  16 {
  17         struct atm_dev *adev = to_atm_dev(cdev);
  18
  19         return scnprintf(buf, PAGE_SIZE, "%s\n", adev->type);
  20 }
  21
  22 static ssize_t show_address(struct device *cdev,
  23                             struct device_attribute *attr, char *buf)
  24 {
  25         struct atm_dev *adev = to_atm_dev(cdev);
  26
  27         return scnprintf(buf, PAGE_SIZE, "%pM\n", adev->esi);
  28 }
  29
  30 static ssize_t show_atmaddress(struct device *cdev,
  31                                struct device_attribute *attr, char *buf)
  32 {
  33         unsigned long flags;
  34         struct atm_dev *adev = to_atm_dev(cdev);
  35         struct atm_dev_addr *aaddr;
  36         int bin[] = { 1, 2, 10, 6, 1 }, *fmt = bin;
  37         int i, j, count = 0;
  38
  39         spin_lock_irqsave(&adev->lock, flags);
  40         list_for_each_entry(aaddr, &adev->local, entry) {
  41                 for (i = 0, j = 0; i < ATM_ESA_LEN; ++i, ++j) {
  42                         if (j == *fmt) {
  43                                 count += scnprintf(buf + count,
  44                                                    PAGE_SIZE - count, ".");
  45                                 ++fmt;
  46                                 j = 0;
  47                         }
  48                         count += scnprintf(buf + count,
  49                                            PAGE_SIZE - count, "%02x",
  50                                            aaddr->addr.sas_addr.prv[i]);
  51                 }
  52                 count += scnprintf(buf + count, PAGE_SIZE - count, "\n");
  53         }
  54         spin_unlock_irqrestore(&adev->lock, flags);
  55
  56         return count;
  57 }
  58
  59 static ssize_t show_atmindex(struct device *cdev,
  60                              struct device_attribute *attr, char *buf)
  61 {
  62         struct atm_dev *adev = to_atm_dev(cdev);
  63
  64         return scnprintf(buf, PAGE_SIZE, "%d\n", adev->number);
  65 }
  66
  67 static ssize_t show_carrier(struct device *cdev,
  68                             struct device_attribute *attr, char *buf)
  69 {
  70         struct atm_dev *adev = to_atm_dev(cdev);
  71
  72         return scnprintf(buf, PAGE_SIZE, "%d\n",
  73                          adev->signal == ATM_PHY_SIG_LOST ? 0 : 1);
  74 }
  75
  76 static ssize_t show_link_rate(struct device *cdev,
  77                               struct device_attribute *attr, char *buf)
  78 {
  79         struct atm_dev *adev = to_atm_dev(cdev);
  80         int link_rate;
  81
  82         /* show the link rate, not the data rate */
  83         switch (adev->link_rate) {
  84         case ATM_OC3_PCR:
  85                 link_rate = 155520000;
  86                 break;
  87         case ATM_OC12_PCR:
  88                 link_rate = 622080000;
  89                 break;
  90         case ATM_25_PCR:
  91                 link_rate = 25600000;
  92                 break;
  93         default:
  94                 link_rate = adev->link_rate * 8 * 53;
  95         }
  96         return scnprintf(buf, PAGE_SIZE, "%d\n", link_rate);
  97 }
  98
  99 static DEVICE_ATTR(address, 0444, show_address, NULL);
 100 static DEVICE_ATTR(atmaddress, 0444, show_atmaddress, NULL);
 101 static DEVICE_ATTR(atmindex, 0444, show_atmindex, NULL);
 102 static DEVICE_ATTR(carrier, 0444, show_carrier, NULL);
 103 static DEVICE_ATTR(type, 0444, show_type, NULL);
 104 static DEVICE_ATTR(link_rate, 0444, show_link_rate, NULL);
 105
 106 static struct device_attribute *atm_attrs[] = {
 107         &dev_attr_atmaddress,
 108         &dev_attr_address,
 109         &dev_attr_atmindex,
 110         &dev_attr_carrier,
 111         &dev_attr_type,
 112         &dev_attr_link_rate,
 113         NULL
 114 };
 115
 116
 117 static int atm_uevent(struct device *cdev, struct kobj_uevent_env *env)
 118 {
 119         struct atm_dev *adev;
 120
 121         if (!cdev)
 122                 return -ENODEV;
 123
 124         adev = to_atm_dev(cdev);
 125         if (!adev)
 126                 return -ENODEV;
 127
 128         if (add_uevent_var(env, "NAME=%s%d", adev->type, adev->number))
 129                 return -ENOMEM;
 130
 131         return 0;
 132 }
 133
 134 static void atm_release(struct device *cdev)
 135 {
 136         struct atm_dev *adev = to_atm_dev(cdev);
 137
 138         kfree(adev);
 139 }
 140
 141 static struct class atm_class = {
 142         .name           = "atm",
 143         .dev_release    = atm_release,
 144         .dev_uevent             = atm_uevent,
 145 };
 146
 147 int atm_register_sysfs(struct atm_dev *adev, struct device *parent)
 148 {
 149         struct device *cdev = &adev->class_dev;
 150         int i, j, err;
 151
 152         cdev->class = &atm_class;
 153         cdev->parent = parent;
 154         dev_set_drvdata(cdev, adev);
 155
 156         dev_set_name(cdev, "%s%d", adev->type, adev->number);
 157         err = device_register(cdev);
 158         if (err < 0)
 159                 return err;
 160
 161         for (i = 0; atm_attrs[i]; i++) {
 162                 err = device_create_file(cdev, atm_attrs[i]);
 163                 if (err)
 164                         goto err_out;
 165         }
 166
 167         return 0;
 168
 169 err_out:
 170         for (j = 0; j < i; j++)
 171                 device_remove_file(cdev, atm_attrs[j]);
 172         device_del(cdev);
 173         return err;
 174 }
 175
 176 void atm_unregister_sysfs(struct atm_dev *adev)
 177 {
 178         struct device *cdev = &adev->class_dev;
 179
 180         device_del(cdev);
 181 }
 182
 183 int __init atm_sysfs_init(void)
 184 {
 185         return class_register(&atm_class);
 186 }
 187
 188 void __exit atm_sysfs_exit(void)
 189 {
 190         class_unregister(&atm_class);
 191 }