Eric Lee / linux-smarc-t335x-v3.2

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Commit c69fb76e8f53b36b81fd7c8a1ed251aaf6bb0386

Authored by Karl Hiramoto
Committed by David S. Miller
1 parent 005066122b
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

atm/adummy: add syfs DEVICE_ATTR to change signal 

Signed-off-by: Karl Hiramoto <karl@hiramoto.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Showing 1 changed file with 39 additions and 0 deletions Side-by-side Diff

drivers/atm/adummy.c
Diff comments   View file @ c69fb76
... ... @@ -40,6 +40,42 @@
40 40  
41 41 static LIST_HEAD(adummy_devs);
42 42  
  43 +static ssize_t __set_signal(struct device *dev,
  44 + struct device_attribute *attr,
  45 + const char *buf, size_t len)
  46 +{
  47 + struct atm_dev *atm_dev = container_of(dev, struct atm_dev, class_dev);
  48 + int signal;
  49 +
  50 + if (sscanf(buf, "%d", &signal) == 1) {
  51 +
  52 + if (signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND)
  53 + signal = ATM_PHY_SIG_UNKNOWN;
  54 +
  55 + atm_dev_signal_change(atm_dev, signal);
  56 + return 1;
  57 + }
  58 + return -EINVAL;
  59 +}
  60 +
  61 +static ssize_t __show_signal(struct device *dev,
  62 + struct device_attribute *attr, char *buf)
  63 +{
  64 + struct atm_dev *atm_dev = container_of(dev, struct atm_dev, class_dev);
  65 + return sprintf(buf, "%d\n", atm_dev->signal);
  66 +}
  67 +static DEVICE_ATTR(signal, 0644, __show_signal, __set_signal);
  68 +
  69 +static struct attribute *adummy_attrs[] = {
  70 + &dev_attr_signal.attr,
  71 + NULL
  72 +};
  73 +
  74 +static struct attribute_group adummy_group_attrs = {
  75 + .name = NULL, /* We want them in dev's root folder */
  76 + .attrs = adummy_attrs
  77 +};
  78 +
43 79 static int __init
44 80 adummy_start(struct atm_dev *dev)
45 81 {
... ... @@ -127,6 +163,9 @@
127 163  
128 164 adummy_dev->atm_dev = atm_dev;
129 165 atm_dev->dev_data = adummy_dev;
  166 +
  167 + if (sysfs_create_group(&atm_dev->class_dev.kobj, &adummy_group_attrs))
  168 + dev_err(&atm_dev->class_dev, "Could not register attrs for adummy\n");
130 169  
131 170 if (adummy_start(atm_dev)) {
132 171 printk(KERN_ERR DEV_LABEL ": adummy_start() failed\n");