Skip to content

Commit

Permalink
[PATCH] pcmcia: hotplug event for PCMCIA devices
Browse files Browse the repository at this point in the history
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>
  • Loading branch information
Dominik Brodowski authored and Linus Torvalds committed Jun 28, 2005
1 parent 7925407 commit 840c2ac
Showing 1 changed file with 67 additions and 0 deletions.
67 changes: 67 additions & 0 deletions drivers/pcmcia/ds.c
Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,7 @@
#include <linux/delay.h>
#include <linux/kref.h>
#include <linux/workqueue.h>
#include <linux/crc32.h>

#include <asm/atomic.h>

Expand Down Expand Up @@ -601,6 +602,71 @@ static int pcmcia_bus_match(struct device * dev, struct device_driver * drv) {
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) \
Expand Down Expand Up @@ -1575,6 +1641,7 @@ static struct class_interface pcmcia_bus_interface = {

struct bus_type pcmcia_bus_type = {
.name = "pcmcia",
.hotplug = pcmcia_bus_hotplug,
.match = pcmcia_bus_match,
.dev_attrs = pcmcia_dev_attrs,
};
Expand Down

0 comments on commit 840c2ac

Please sign in to comment.