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[PATCH] Input: export input_dev data via sysfs attributes
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Input: export various input device attributes via sysfs

The following structure is exported:

  input0/
	|-- name
	|-- phys
	|-- uniq
	|-- id/{bustype|vendor|product|version}
	`-- capabilities/{ev|abs|rel|key|led|msc|ff|sw}

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Dmitry Torokhov authored and Greg Kroah-Hartman committed Oct 28, 2005
1 parent 051b2fe commit 5c1e9a6
Showing 1 changed file with 133 additions and 23 deletions.
156 changes: 133 additions & 23 deletions drivers/input/input.c
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Original file line number Diff line number Diff line change
Expand Up @@ -434,6 +434,23 @@ static void input_call_hotplug(char *verb, struct input_dev *dev)

#endif

static int input_print_bitmap(char *buf, unsigned long *bitmap, int max)
{
int i;
int len = 0;

for (i = NBITS(max) - 1; i > 0; i--)
if (bitmap[i])
break;

for (; i >= 0; i--)
len += sprintf(buf + len, "%lx%s", bitmap[i], i > 0 ? " " : "");

len += sprintf(buf + len, "\n");

return len;
}

#ifdef CONFIG_PROC_FS

static struct proc_dir_entry *proc_bus_input_dir;
Expand All @@ -455,20 +472,17 @@ static unsigned int input_devices_poll(struct file *file, poll_table *wait)
return 0;
}

#define SPRINTF_BIT_B(bit, name, max) \
do { \
len += sprintf(buf + len, "B: %s", name); \
for (i = NBITS(max) - 1; i >= 0; i--) \
if (dev->bit[i]) break; \
for (; i >= 0; i--) \
len += sprintf(buf + len, "%lx ", dev->bit[i]); \
len += sprintf(buf + len, "\n"); \
#define SPRINTF_BIT_B(ev, bm) \
do { \
len += sprintf(buf + len, "B: %s=", #ev); \
len += input_print_bitmap(buf + len, \
dev->bm##bit, ev##_MAX); \
} while (0)

#define SPRINTF_BIT_B2(bit, name, max, ev) \
do { \
if (test_bit(ev, dev->evbit)) \
SPRINTF_BIT_B(bit, name, max); \
#define SPRINTF_BIT_B2(ev, bm) \
do { \
if (test_bit(EV_##ev, dev->evbit)) \
SPRINTF_BIT_B(ev, bm); \
} while (0)

static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
Expand All @@ -478,7 +492,7 @@ static int input_devices_read(char *buf, char **start, off_t pos, int count, int
const char *path;

off_t at = 0;
int i, len, cnt = 0;
int len, cnt = 0;

list_for_each_entry(dev, &input_dev_list, node) {

Expand All @@ -497,15 +511,15 @@ static int input_devices_read(char *buf, char **start, off_t pos, int count, int

len += sprintf(buf + len, "\n");

SPRINTF_BIT_B(evbit, "EV=", EV_MAX);
SPRINTF_BIT_B2(keybit, "KEY=", KEY_MAX, EV_KEY);
SPRINTF_BIT_B2(relbit, "REL=", REL_MAX, EV_REL);
SPRINTF_BIT_B2(absbit, "ABS=", ABS_MAX, EV_ABS);
SPRINTF_BIT_B2(mscbit, "MSC=", MSC_MAX, EV_MSC);
SPRINTF_BIT_B2(ledbit, "LED=", LED_MAX, EV_LED);
SPRINTF_BIT_B2(sndbit, "SND=", SND_MAX, EV_SND);
SPRINTF_BIT_B2(ffbit, "FF=", FF_MAX, EV_FF);
SPRINTF_BIT_B2(swbit, "SW=", SW_MAX, EV_SW);
SPRINTF_BIT_B(EV, ev);
SPRINTF_BIT_B2(KEY, key);
SPRINTF_BIT_B2(REL, rel);
SPRINTF_BIT_B2(ABS, abs);
SPRINTF_BIT_B2(MSC, msc);
SPRINTF_BIT_B2(LED, led);
SPRINTF_BIT_B2(SND, snd);
SPRINTF_BIT_B2(FF, ff);
SPRINTF_BIT_B2(SW, sw);

len += sprintf(buf + len, "\n");

Expand Down Expand Up @@ -612,6 +626,96 @@ static inline int input_proc_init(void) { return 0; }
static inline void input_proc_exit(void) { }
#endif

#define INPUT_DEV_STRING_ATTR_SHOW(name) \
static ssize_t input_dev_show_##name(struct class_device *dev, char *buf) \
{ \
struct input_dev *input_dev = to_input_dev(dev); \
int retval; \
\
retval = down_interruptible(&input_dev->sem); \
if (retval) \
return retval; \
\
retval = sprintf(buf, "%s\n", input_dev->name ? input_dev->name : ""); \
\
up(&input_dev->sem); \
\
return retval; \
}

INPUT_DEV_STRING_ATTR_SHOW(name);
INPUT_DEV_STRING_ATTR_SHOW(phys);
INPUT_DEV_STRING_ATTR_SHOW(uniq);

static struct class_device_attribute input_dev_attrs[] = {
__ATTR(name, S_IRUGO, input_dev_show_name, NULL),
__ATTR(phys, S_IRUGO, input_dev_show_phys, NULL),
__ATTR(uniq, S_IRUGO, input_dev_show_uniq, NULL),
__ATTR_NULL
};

#define INPUT_DEV_ID_ATTR(name) \
static ssize_t input_dev_show_id_##name(struct class_device *dev, char *buf) \
{ \
struct input_dev *input_dev = to_input_dev(dev); \
return sprintf(buf, "%04x\n", input_dev->id.name); \
} \
static CLASS_DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL);

INPUT_DEV_ID_ATTR(bustype);
INPUT_DEV_ID_ATTR(vendor);
INPUT_DEV_ID_ATTR(product);
INPUT_DEV_ID_ATTR(version);

static struct attribute *input_dev_id_attrs[] = {
&class_device_attr_bustype.attr,
&class_device_attr_vendor.attr,
&class_device_attr_product.attr,
&class_device_attr_version.attr,
NULL
};

static struct attribute_group input_dev_id_attr_group = {
.name = "id",
.attrs = input_dev_id_attrs,
};

#define INPUT_DEV_CAP_ATTR(ev, bm) \
static ssize_t input_dev_show_cap_##bm(struct class_device *dev, char *buf) \
{ \
struct input_dev *input_dev = to_input_dev(dev); \
return input_print_bitmap(buf, input_dev->bm##bit, ev##_MAX); \
} \
static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);

INPUT_DEV_CAP_ATTR(EV, ev);
INPUT_DEV_CAP_ATTR(KEY, key);
INPUT_DEV_CAP_ATTR(REL, rel);
INPUT_DEV_CAP_ATTR(ABS, abs);
INPUT_DEV_CAP_ATTR(MSC, msc);
INPUT_DEV_CAP_ATTR(LED, led);
INPUT_DEV_CAP_ATTR(SND, snd);
INPUT_DEV_CAP_ATTR(FF, ff);
INPUT_DEV_CAP_ATTR(SW, sw);

static struct attribute *input_dev_caps_attrs[] = {
&class_device_attr_ev.attr,
&class_device_attr_key.attr,
&class_device_attr_rel.attr,
&class_device_attr_abs.attr,
&class_device_attr_msc.attr,
&class_device_attr_led.attr,
&class_device_attr_snd.attr,
&class_device_attr_ff.attr,
&class_device_attr_sw.attr,
NULL
};

static struct attribute_group input_dev_caps_attr_group = {
.name = "capabilities",
.attrs = input_dev_caps_attrs,
};

static void input_dev_release(struct class_device *class_dev)
{
struct input_dev *dev = to_input_dev(class_dev);
Expand All @@ -623,6 +727,7 @@ static void input_dev_release(struct class_device *class_dev)
static struct class input_dev_class = {
.name = "input_dev",
.release = input_dev_release,
.class_dev_attrs = input_dev_attrs,
};

struct input_dev *input_allocate_device(void)
Expand Down Expand Up @@ -660,6 +765,8 @@ static void input_register_classdevice(struct input_dev *dev)
kfree(path);

class_device_add(&dev->cdev);
sysfs_create_group(&dev->cdev.kobj, &input_dev_id_attr_group);
sysfs_create_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
}

void input_register_device(struct input_dev *dev)
Expand Down Expand Up @@ -726,8 +833,11 @@ void input_unregister_device(struct input_dev *dev)

list_del_init(&dev->node);

if (dev->dynalloc)
if (dev->dynalloc) {
sysfs_remove_group(&dev->cdev.kobj, &input_dev_caps_attr_group);
sysfs_remove_group(&dev->cdev.kobj, &input_dev_id_attr_group);
class_device_unregister(&dev->cdev);
}

input_wakeup_procfs_readers();
}
Expand Down

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