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