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[PATCH] Input: add modalias support
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Here's the patch for modalias support for input classes.  It uses
comma-separated numbers, and doesn't describe all the potential keys (no
module currently cares, and that would make the strings huge).  The
changes to input.h are to move the definitions needed by file2alias
outside __KERNEL__.  I chose not to move those definitions to
mod_devicetable.h, because there are so many that it might break compile
of something else in the kernel.

The rest is fairly straightforward.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
CC: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Rusty Russell authored and Greg Kroah-Hartman committed Jan 5, 2006
1 parent 263756e commit 1d8f430
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Showing 3 changed files with 141 additions and 39 deletions.
39 changes: 39 additions & 0 deletions drivers/input/input.c
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Original file line number Diff line number Diff line change
Expand Up @@ -528,10 +528,49 @@ INPUT_DEV_STRING_ATTR_SHOW(name);
INPUT_DEV_STRING_ATTR_SHOW(phys);
INPUT_DEV_STRING_ATTR_SHOW(uniq);

static int print_modalias_bits(char *buf, char prefix, unsigned long *arr,
unsigned int min, unsigned int max)
{
int len, i;

len = sprintf(buf, "%c", prefix);
for (i = min; i < max; i++)
if (arr[LONG(i)] & BIT(i))
len += sprintf(buf+len, "%X,", i);
return len;
}

static ssize_t input_dev_show_modalias(struct class_device *dev, char *buf)
{
struct input_dev *id = to_input_dev(dev);
ssize_t len = 0;

len += sprintf(buf+len, "input:b%04Xv%04Xp%04Xe%04X-",
id->id.bustype,
id->id.vendor,
id->id.product,
id->id.version);

len += print_modalias_bits(buf+len, 'e', id->evbit, 0, EV_MAX);
len += print_modalias_bits(buf+len, 'k', id->keybit,
KEY_MIN_INTERESTING, KEY_MAX);
len += print_modalias_bits(buf+len, 'r', id->relbit, 0, REL_MAX);
len += print_modalias_bits(buf+len, 'a', id->absbit, 0, ABS_MAX);
len += print_modalias_bits(buf+len, 'm', id->mscbit, 0, MSC_MAX);
len += print_modalias_bits(buf+len, 'l', id->ledbit, 0, LED_MAX);
len += print_modalias_bits(buf+len, 's', id->sndbit, 0, SND_MAX);
len += print_modalias_bits(buf+len, 'f', id->ffbit, 0, FF_MAX);
len += print_modalias_bits(buf+len, 'w', id->swbit, 0, SW_MAX);
len += sprintf(buf+len, "\n");
return len;
}
static CLASS_DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);

static struct attribute *input_dev_attrs[] = {
&class_device_attr_name.attr,
&class_device_attr_phys.attr,
&class_device_attr_uniq.attr,
&class_device_attr_modalias.attr,
NULL
};

Expand Down
79 changes: 41 additions & 38 deletions include/linux/input.h
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
#include <sys/ioctl.h>
#include <asm/types.h>
#endif
#include <linux/mod_devicetable.h>

/*
* The event structure itself
Expand Down Expand Up @@ -511,6 +512,8 @@ struct input_absinfo {
#define KEY_FN_S 0x1e3
#define KEY_FN_B 0x1e4

/* We avoid low common keys in module aliases so they don't get huge. */
#define KEY_MIN_INTERESTING KEY_MUTE
#define KEY_MAX 0x1ff

/*
Expand Down Expand Up @@ -793,6 +796,44 @@ struct ff_effect {

#define FF_MAX 0x7f

struct input_device_id {

kernel_ulong_t flags;

struct input_id id;

kernel_ulong_t evbit[EV_MAX/BITS_PER_LONG+1];
kernel_ulong_t keybit[KEY_MAX/BITS_PER_LONG+1];
kernel_ulong_t relbit[REL_MAX/BITS_PER_LONG+1];
kernel_ulong_t absbit[ABS_MAX/BITS_PER_LONG+1];
kernel_ulong_t mscbit[MSC_MAX/BITS_PER_LONG+1];
kernel_ulong_t ledbit[LED_MAX/BITS_PER_LONG+1];
kernel_ulong_t sndbit[SND_MAX/BITS_PER_LONG+1];
kernel_ulong_t ffbit[FF_MAX/BITS_PER_LONG+1];
kernel_ulong_t swbit[SW_MAX/BITS_PER_LONG+1];

kernel_ulong_t driver_info;
};

/*
* Structure for hotplug & device<->driver matching.
*/

#define INPUT_DEVICE_ID_MATCH_BUS 1
#define INPUT_DEVICE_ID_MATCH_VENDOR 2
#define INPUT_DEVICE_ID_MATCH_PRODUCT 4
#define INPUT_DEVICE_ID_MATCH_VERSION 8

#define INPUT_DEVICE_ID_MATCH_EVBIT 0x010
#define INPUT_DEVICE_ID_MATCH_KEYBIT 0x020
#define INPUT_DEVICE_ID_MATCH_RELBIT 0x040
#define INPUT_DEVICE_ID_MATCH_ABSBIT 0x080
#define INPUT_DEVICE_ID_MATCH_MSCIT 0x100
#define INPUT_DEVICE_ID_MATCH_LEDBIT 0x200
#define INPUT_DEVICE_ID_MATCH_SNDBIT 0x400
#define INPUT_DEVICE_ID_MATCH_FFBIT 0x800
#define INPUT_DEVICE_ID_MATCH_SWBIT 0x1000

#ifdef __KERNEL__

/*
Expand Down Expand Up @@ -901,49 +942,11 @@ struct input_dev {
};
#define to_input_dev(d) container_of(d, struct input_dev, cdev)

/*
* Structure for hotplug & device<->driver matching.
*/

#define INPUT_DEVICE_ID_MATCH_BUS 1
#define INPUT_DEVICE_ID_MATCH_VENDOR 2
#define INPUT_DEVICE_ID_MATCH_PRODUCT 4
#define INPUT_DEVICE_ID_MATCH_VERSION 8

#define INPUT_DEVICE_ID_MATCH_EVBIT 0x010
#define INPUT_DEVICE_ID_MATCH_KEYBIT 0x020
#define INPUT_DEVICE_ID_MATCH_RELBIT 0x040
#define INPUT_DEVICE_ID_MATCH_ABSBIT 0x080
#define INPUT_DEVICE_ID_MATCH_MSCIT 0x100
#define INPUT_DEVICE_ID_MATCH_LEDBIT 0x200
#define INPUT_DEVICE_ID_MATCH_SNDBIT 0x400
#define INPUT_DEVICE_ID_MATCH_FFBIT 0x800
#define INPUT_DEVICE_ID_MATCH_SWBIT 0x1000

#define INPUT_DEVICE_ID_MATCH_DEVICE\
(INPUT_DEVICE_ID_MATCH_BUS | INPUT_DEVICE_ID_MATCH_VENDOR | INPUT_DEVICE_ID_MATCH_PRODUCT)
#define INPUT_DEVICE_ID_MATCH_DEVICE_AND_VERSION\
(INPUT_DEVICE_ID_MATCH_DEVICE | INPUT_DEVICE_ID_MATCH_VERSION)

struct input_device_id {

unsigned long flags;

struct input_id id;

unsigned long evbit[NBITS(EV_MAX)];
unsigned long keybit[NBITS(KEY_MAX)];
unsigned long relbit[NBITS(REL_MAX)];
unsigned long absbit[NBITS(ABS_MAX)];
unsigned long mscbit[NBITS(MSC_MAX)];
unsigned long ledbit[NBITS(LED_MAX)];
unsigned long sndbit[NBITS(SND_MAX)];
unsigned long ffbit[NBITS(FF_MAX)];
unsigned long swbit[NBITS(SW_MAX)];

unsigned long driver_info;
};

struct input_handle;

struct input_handler {
Expand Down
62 changes: 61 additions & 1 deletion scripts/mod/file2alias.c
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Original file line number Diff line number Diff line change
Expand Up @@ -16,8 +16,10 @@
* use either stdint.h or inttypes.h for the rest. */
#if KERNEL_ELFCLASS == ELFCLASS32
typedef Elf32_Addr kernel_ulong_t;
#define BITS_PER_LONG 32
#else
typedef Elf64_Addr kernel_ulong_t;
#define BITS_PER_LONG 64
#endif
#ifdef __sun__
#include <inttypes.h>
Expand All @@ -35,6 +37,7 @@ typedef unsigned char __u8;
* even potentially has different endianness and word sizes, since
* we handle those differences explicitly below */
#include "../../include/linux/mod_devicetable.h"
#include "../../include/linux/input.h"

#define ADD(str, sep, cond, field) \
do { \
Expand Down Expand Up @@ -366,6 +369,61 @@ static int do_i2c_entry(const char *filename, struct i2c_device_id *i2c, char *a
return 1;
}

#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))

static void do_input(char *alias,
kernel_ulong_t *arr, unsigned int min, unsigned int max)
{
unsigned int i;
for (i = min; i < max; i++) {
if (arr[i/BITS_PER_LONG] & (1 << (i%BITS_PER_LONG)))
sprintf(alias+strlen(alias), "%X,*", i);
}
}

/* input:b0v0p0e0-eXkXrXaXmXlXsXfXwX where X is comma-separated %02X. */
static int do_input_entry(const char *filename, struct input_device_id *id,
char *alias)
{
sprintf(alias, "input:");

ADD(alias, "b", id->flags&INPUT_DEVICE_ID_MATCH_BUS, id->id.bustype);
ADD(alias, "v", id->flags&INPUT_DEVICE_ID_MATCH_VENDOR, id->id.vendor);
ADD(alias, "p", id->flags&INPUT_DEVICE_ID_MATCH_PRODUCT,
id->id.product);
ADD(alias, "e", id->flags&INPUT_DEVICE_ID_MATCH_VERSION,
id->id.version);

sprintf(alias + strlen(alias), "-e*");
if (id->flags&INPUT_DEVICE_ID_MATCH_EVBIT)
do_input(alias, id->evbit, 0, EV_MAX);
sprintf(alias + strlen(alias), "k*");
if (id->flags&INPUT_DEVICE_ID_MATCH_KEYBIT)
do_input(alias, id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
sprintf(alias + strlen(alias), "r*");
if (id->flags&INPUT_DEVICE_ID_MATCH_RELBIT)
do_input(alias, id->relbit, 0, REL_MAX);
sprintf(alias + strlen(alias), "a*");
if (id->flags&INPUT_DEVICE_ID_MATCH_ABSBIT)
do_input(alias, id->absbit, 0, ABS_MAX);
sprintf(alias + strlen(alias), "m*");
if (id->flags&INPUT_DEVICE_ID_MATCH_MSCIT)
do_input(alias, id->mscbit, 0, MSC_MAX);
sprintf(alias + strlen(alias), "l*");
if (id->flags&INPUT_DEVICE_ID_MATCH_LEDBIT)
do_input(alias, id->ledbit, 0, LED_MAX);
sprintf(alias + strlen(alias), "s*");
if (id->flags&INPUT_DEVICE_ID_MATCH_SNDBIT)
do_input(alias, id->sndbit, 0, SND_MAX);
sprintf(alias + strlen(alias), "f*");
if (id->flags&INPUT_DEVICE_ID_MATCH_FFBIT)
do_input(alias, id->ffbit, 0, SND_MAX);
sprintf(alias + strlen(alias), "w*");
if (id->flags&INPUT_DEVICE_ID_MATCH_SWBIT)
do_input(alias, id->swbit, 0, SW_MAX);
return 1;
}

/* Ignore any prefix, eg. v850 prepends _ */
static inline int sym_is(const char *symbol, const char *name)
{
Expand Down Expand Up @@ -453,7 +511,9 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
else if (sym_is(symname, "__mod_i2c_device_table"))
do_table(symval, sym->st_size, sizeof(struct i2c_device_id),
do_i2c_entry, mod);

else if (sym_is(symname, "__mod_input_device_table"))
do_table(symval, sym->st_size, sizeof(struct input_device_id),
do_input_entry, mod);
}

/* Now add out buffered information to the generated C source */
Expand Down

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