[PATCH] pcmcia: hotplug event for PCMCIA devices
Export information to /sbin/hotplug for PCMCIA devices: card_id, manf_id,
func_id, bus_id (like pcmcia1.0) and crc32-hashes of the prod_id strings.
Why not the prod_id strings themselves?
a) They may contain all sorts of strange and difficult to handle characters,
like " ".
b) It's impossible to pass multiple strings to userspace.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c
index 569e55f..35d479b 100644
--- a/drivers/pcmcia/ds.c
+++ b/drivers/pcmcia/ds.c
@@ -35,6 +35,7 @@
#include <linux/delay.h>
#include <linux/kref.h>
#include <linux/workqueue.h>
+#include <linux/crc32.h>
#include <asm/atomic.h>
@@ -601,6 +602,71 @@
return 0;
}
+#ifdef CONFIG_HOTPLUG
+
+static int pcmcia_bus_hotplug(struct device *dev, char **envp, int num_envp,
+ char *buffer, int buffer_size)
+{
+ struct pcmcia_device *p_dev;
+ int i, length = 0;
+ u32 hash[4] = { 0, 0, 0, 0};
+
+ if (!dev)
+ return -ENODEV;
+
+ p_dev = to_pcmcia_dev(dev);
+
+ /* calculate hashes */
+ for (i=0; i<4; i++) {
+ if (!p_dev->prod_id[i])
+ continue;
+ hash[i] = crc32(0, p_dev->prod_id[i], strlen(p_dev->prod_id[i]));
+ }
+
+ i = 0;
+
+ if (add_hotplug_env_var(envp, num_envp, &i,
+ buffer, buffer_size, &length,
+ "SOCKET_NO=%u",
+ p_dev->socket->sock))
+ return -ENOMEM;
+
+ if (add_hotplug_env_var(envp, num_envp, &i,
+ buffer, buffer_size, &length,
+ "DEVICE_NO=%02X",
+ p_dev->device_no))
+ return -ENOMEM;
+
+ if (add_hotplug_env_var(envp, num_envp, &i,
+ buffer, buffer_size, &length,
+ "MODALIAS=pcmcia:m%04Xc%04Xf%02Xfn%02Xpfn%02X"
+ "pa%08Xpb%08Xpc%08Xpd%08X",
+ p_dev->has_manf_id ? p_dev->manf_id : 0,
+ p_dev->has_card_id ? p_dev->card_id : 0,
+ p_dev->has_func_id ? p_dev->func_id : 0,
+ p_dev->func,
+ p_dev->device_no,
+ hash[0],
+ hash[1],
+ hash[2],
+ hash[3]))
+ return -ENOMEM;
+
+ envp[i] = NULL;
+
+ return 0;
+}
+
+#else
+
+static int pcmcia_bus_hotplug(struct device *dev, char **envp, int num_envp,
+ char *buffer, int buffer_size)
+{
+ return -ENODEV;
+}
+
+#endif
+
/************************ per-device sysfs output ***************************/
#define pcmcia_device_attr(field, test, format) \
@@ -1575,6 +1641,7 @@
struct bus_type pcmcia_bus_type = {
.name = "pcmcia",
+ .hotplug = pcmcia_bus_hotplug,
.match = pcmcia_bus_match,
.dev_attrs = pcmcia_dev_attrs,
};