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[PATCH] pcmcia: hotplug event for PCMCIA devices

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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>
This commit is contained in:
Dominik Brodowski 2005-06-27 16:28:04 -07:00 committed by Linus Torvalds
parent 7925407aa0
commit 840c2ac5d3
1 changed files with 67 additions and 0 deletions
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67
drivers/pcmcia/ds.c
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@ -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 @@ 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) \
@ -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,
};