[PATCH] pcmcia: export CIS in sysfs
Dominik Brodowski [Mon, 27 Jun 2005 23:28:08 +0000 (16:28 -0700)]
Export the CIS to userspace using a sysfs binary file in
/sys/class/pcmcia_socket/pcmcia_scoket%n/

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/pcmcia/socket_sysfs.c

index 8eed039..fd5a3b0 100644 (file)
@@ -187,6 +187,102 @@ static ssize_t pccard_store_resource(struct class_device *dev, const char *buf,
 static CLASS_DEVICE_ATTR(available_resources_setup_done, 0600, pccard_show_resource, pccard_store_resource);
 
 
+static ssize_t pccard_extract_cis(struct pcmcia_socket *s, char *buf, loff_t off, size_t count)
+{
+       tuple_t tuple;
+       int status, i;
+       loff_t pointer = 0;
+       ssize_t ret = 0;
+       u_char *tuplebuffer;
+       u_char *tempbuffer;
+
+       tuplebuffer = kmalloc(sizeof(u_char) * 256, GFP_KERNEL);
+       if (!tuplebuffer)
+               return -ENOMEM;
+
+       tempbuffer = kmalloc(sizeof(u_char) * 258, GFP_KERNEL);
+       if (!tempbuffer) {
+               ret = -ENOMEM;
+               goto free_tuple;
+       }
+
+       memset(&tuple, 0, sizeof(tuple_t));
+
+       tuple.Attributes = TUPLE_RETURN_LINK | TUPLE_RETURN_COMMON;
+       tuple.DesiredTuple = RETURN_FIRST_TUPLE;
+       tuple.TupleOffset = 0;
+
+       status = pccard_get_first_tuple(s, BIND_FN_ALL, &tuple);
+       while (!status) {
+               tuple.TupleData = tuplebuffer;
+               tuple.TupleDataMax = 255;
+               memset(tuplebuffer, 0, sizeof(u_char) * 255);
+
+               status = pccard_get_tuple_data(s, &tuple);
+               if (status)
+                       break;
+
+               if (off < (pointer + 2 + tuple.TupleDataLen)) {
+                       tempbuffer[0] = tuple.TupleCode & 0xff;
+                       tempbuffer[1] = tuple.TupleLink & 0xff;
+                       for (i = 0; i < tuple.TupleDataLen; i++)
+                               tempbuffer[i + 2] = tuplebuffer[i] & 0xff;
+
+                       for (i = 0; i < (2 + tuple.TupleDataLen); i++) {
+                               if (((i + pointer) >= off) &&
+                                   (i + pointer) < (off + count)) {
+                                       buf[ret] = tempbuffer[i];
+                                       ret++;
+                               }
+                       }
+               }
+
+               pointer += 2 + tuple.TupleDataLen;
+
+               if (pointer >= (off + count))
+                       break;
+
+               if (tuple.TupleCode == CISTPL_END)
+                       break;
+               status = pccard_get_next_tuple(s, BIND_FN_ALL, &tuple);
+       }
+
+       kfree(tempbuffer);
+ free_tuple:
+       kfree(tuplebuffer);
+
+       return (ret);
+}
+
+static ssize_t pccard_show_cis(struct kobject *kobj, char *buf, loff_t off, size_t count)
+{
+       unsigned int size = 0x200;
+
+       if (off >= size)
+               count = 0;
+       else {
+               struct pcmcia_socket *s;
+               cisinfo_t cisinfo;
+
+               if (off + count > size)
+                       count = size - off;
+
+               s = to_socket(container_of(kobj, struct class_device, kobj));
+
+               if (!(s->state & SOCKET_PRESENT))
+                       return -ENODEV;
+               if (pccard_validate_cis(s, BIND_FN_ALL, &cisinfo))
+                       return -EIO;
+               if (!cisinfo.Chains)
+                       return -ENODATA;
+
+               count = pccard_extract_cis(s, buf, off, count);
+       }
+
+       return (count);
+}
+
+
 static struct class_device_attribute *pccard_socket_attributes[] = {
        &class_device_attr_card_type,
        &class_device_attr_card_voltage,
@@ -199,6 +295,12 @@ static struct class_device_attribute *pccard_socket_attributes[] = {
        NULL,
 };
 
+static struct bin_attribute pccard_cis_attr = {
+       .attr = { .name = "cis", .mode = S_IRUGO, .owner = THIS_MODULE},
+       .size = 0x200,
+       .read = pccard_show_cis,
+};
+
 static int __devinit pccard_sysfs_add_socket(struct class_device *class_dev)
 {
        struct class_device_attribute **attr;
@@ -209,6 +311,8 @@ static int __devinit pccard_sysfs_add_socket(struct class_device *class_dev)
                if (ret)
                        break;
        }
+       if (!ret)
+               ret = sysfs_create_bin_file(&class_dev->kobj, &pccard_cis_attr);
 
        return ret;
 }
@@ -217,6 +321,7 @@ static void __devexit pccard_sysfs_remove_socket(struct class_device *class_dev)
 {
        struct class_device_attribute **attr;
 
+       sysfs_remove_bin_file(&class_dev->kobj, &pccard_cis_attr);
        for (attr = pccard_socket_attributes; *attr; attr++)
                class_device_remove_file(class_dev, *attr);
 }