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Use DEVICE_ATTR_RO helper instead of plain DEVICE_ATTR, which makes the code a bit shorter and easier to read. Signed-off-by: YueHaibing <yuehaibing@huawei.com> Signed-off-by: David S. Miller <davem@davemloft.net>
185 lines
3.9 KiB
C
185 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* ATM driver model support. */
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/kobject.h>
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#include <linux/atmdev.h>
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#include "common.h"
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#include "resources.h"
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#define to_atm_dev(cldev) container_of(cldev, struct atm_dev, class_dev)
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static ssize_t type_show(struct device *cdev,
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struct device_attribute *attr, char *buf)
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{
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struct atm_dev *adev = to_atm_dev(cdev);
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return scnprintf(buf, PAGE_SIZE, "%s\n", adev->type);
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}
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static ssize_t address_show(struct device *cdev,
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struct device_attribute *attr, char *buf)
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{
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struct atm_dev *adev = to_atm_dev(cdev);
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return scnprintf(buf, PAGE_SIZE, "%pM\n", adev->esi);
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}
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static ssize_t atmaddress_show(struct device *cdev,
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struct device_attribute *attr, char *buf)
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{
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unsigned long flags;
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struct atm_dev *adev = to_atm_dev(cdev);
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struct atm_dev_addr *aaddr;
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int count = 0;
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spin_lock_irqsave(&adev->lock, flags);
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list_for_each_entry(aaddr, &adev->local, entry) {
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"%1phN.%2phN.%10phN.%6phN.%1phN\n",
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&aaddr->addr.sas_addr.prv[0],
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&aaddr->addr.sas_addr.prv[1],
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&aaddr->addr.sas_addr.prv[3],
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&aaddr->addr.sas_addr.prv[13],
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&aaddr->addr.sas_addr.prv[19]);
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}
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spin_unlock_irqrestore(&adev->lock, flags);
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return count;
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}
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static ssize_t atmindex_show(struct device *cdev,
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struct device_attribute *attr, char *buf)
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{
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struct atm_dev *adev = to_atm_dev(cdev);
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return scnprintf(buf, PAGE_SIZE, "%d\n", adev->number);
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}
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static ssize_t carrier_show(struct device *cdev,
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struct device_attribute *attr, char *buf)
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{
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struct atm_dev *adev = to_atm_dev(cdev);
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return scnprintf(buf, PAGE_SIZE, "%d\n",
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adev->signal == ATM_PHY_SIG_LOST ? 0 : 1);
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}
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static ssize_t link_rate_show(struct device *cdev,
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struct device_attribute *attr, char *buf)
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{
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struct atm_dev *adev = to_atm_dev(cdev);
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int link_rate;
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/* show the link rate, not the data rate */
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switch (adev->link_rate) {
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case ATM_OC3_PCR:
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link_rate = 155520000;
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break;
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case ATM_OC12_PCR:
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link_rate = 622080000;
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break;
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case ATM_25_PCR:
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link_rate = 25600000;
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break;
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default:
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link_rate = adev->link_rate * 8 * 53;
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}
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return scnprintf(buf, PAGE_SIZE, "%d\n", link_rate);
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}
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static DEVICE_ATTR_RO(address);
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static DEVICE_ATTR_RO(atmaddress);
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static DEVICE_ATTR_RO(atmindex);
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static DEVICE_ATTR_RO(carrier);
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static DEVICE_ATTR_RO(type);
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static DEVICE_ATTR_RO(link_rate);
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static struct device_attribute *atm_attrs[] = {
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&dev_attr_atmaddress,
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&dev_attr_address,
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&dev_attr_atmindex,
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&dev_attr_carrier,
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&dev_attr_type,
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&dev_attr_link_rate,
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NULL
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};
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static int atm_uevent(struct device *cdev, struct kobj_uevent_env *env)
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{
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struct atm_dev *adev;
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if (!cdev)
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return -ENODEV;
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adev = to_atm_dev(cdev);
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if (!adev)
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return -ENODEV;
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if (add_uevent_var(env, "NAME=%s%d", adev->type, adev->number))
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return -ENOMEM;
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return 0;
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}
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static void atm_release(struct device *cdev)
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{
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struct atm_dev *adev = to_atm_dev(cdev);
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kfree(adev);
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}
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static struct class atm_class = {
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.name = "atm",
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.dev_release = atm_release,
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.dev_uevent = atm_uevent,
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};
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int atm_register_sysfs(struct atm_dev *adev, struct device *parent)
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{
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struct device *cdev = &adev->class_dev;
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int i, j, err;
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cdev->class = &atm_class;
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cdev->parent = parent;
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dev_set_drvdata(cdev, adev);
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dev_set_name(cdev, "%s%d", adev->type, adev->number);
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err = device_register(cdev);
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if (err < 0)
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return err;
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for (i = 0; atm_attrs[i]; i++) {
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err = device_create_file(cdev, atm_attrs[i]);
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if (err)
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goto err_out;
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}
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return 0;
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err_out:
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for (j = 0; j < i; j++)
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device_remove_file(cdev, atm_attrs[j]);
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device_del(cdev);
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return err;
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}
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void atm_unregister_sysfs(struct atm_dev *adev)
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{
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struct device *cdev = &adev->class_dev;
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device_del(cdev);
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}
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int __init atm_sysfs_init(void)
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{
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return class_register(&atm_class);
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}
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void __exit atm_sysfs_exit(void)
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{
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class_unregister(&atm_class);
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}
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