[PCMCIA] card voltage

Patch from Dominik Brodowski

Add an attribute "card_voltage" which returns the card's voltage
requirements:

"5.0V", "3.3V" or "X.XV".

diff --git a/drivers/pcmcia/socket_sysfs.c b/drivers/pcmcia/socket_sysfs.c
index 7550b6d981036fcd1d214f5818ba96d1598c0584..5db02fe52a2234d65a6d98b0df3221852529119a 100644 (file)
--- a/drivers/pcmcia/socket_sysfs.c
+++ b/drivers/pcmcia/socket_sysfs.c
@@ -58,8 +58,25 @@ static ssize_t pccard_show_type(struct class_device *dev, char *buf)
 }
 static CLASS_DEVICE_ATTR(card_type, 0400, pccard_show_type, NULL);
 
+static ssize_t pccard_show_voltage(struct class_device *dev, char *buf)
+{
+       int val;
+       struct pcmcia_socket *s = to_socket(dev);
+
+        if (!(s->state & SOCKET_PRESENT))
+                return -ENODEV;
+       s->ops->get_status(s, &val);
+       if (val & SS_3VCARD)
+               return sprintf(buf, "3.3V\n");
+       if (val & SS_XVCARD)
+               return sprintf(buf, "X.XV\n");
+       return sprintf(buf, "5.0V\n");
+}
+static CLASS_DEVICE_ATTR(card_voltage, 0400, pccard_show_voltage, NULL);
+
 static struct class_device_attribute *pccard_socket_attributes[] = {
        &class_device_attr_card_type,
+       &class_device_attr_card_voltage,
        NULL,
 };