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[PATCH] input core: remove custom-made hotplug handler
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Input: remove custom-made hotplug handler

Now that all input devices are registered with sysfs we can remove
old custom-made hotplug handler and crate a standard one.

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 c9bcd58 commit a7fadbe
Showing 1 changed file with 104 additions and 145 deletions.
249 changes: 104 additions & 145 deletions drivers/input/input.c
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Original file line number Diff line number Diff line change
Expand Up @@ -316,125 +316,7 @@ static struct input_device_id *input_match_device(struct input_device_id *id, st
return NULL;
}


/*
* Input hotplugging interface - loading event handlers based on
* device bitfields.
*/

#ifdef CONFIG_HOTPLUG

/*
* Input hotplugging invokes what /proc/sys/kernel/hotplug says
* (normally /sbin/hotplug) when input devices get added or removed.
*
* This invokes a user mode policy agent, typically helping to load driver
* or other modules, configure the device, and more. Drivers can provide
* a MODULE_DEVICE_TABLE to help with module loading subtasks.
*
*/

#define SPRINTF_BIT_A(bit, name, max) \
do { \
envp[i++] = scratch; \
scratch += sprintf(scratch, name); \
for (j = NBITS(max) - 1; j >= 0; j--) \
if (dev->bit[j]) break; \
for (; j >= 0; j--) \
scratch += sprintf(scratch, "%lx ", dev->bit[j]); \
scratch++; \
} while (0)

#define SPRINTF_BIT_A2(bit, name, max, ev) \
do { \
if (test_bit(ev, dev->evbit)) \
SPRINTF_BIT_A(bit, name, max); \
} while (0)

static void input_call_hotplug(char *verb, struct input_dev *dev)
{
char *argv[3], **envp, *buf, *scratch;
int i = 0, j, value;

if (!hotplug_path[0]) {
printk(KERN_ERR "input.c: calling hotplug without a hotplug agent defined\n");
return;
}
if (in_interrupt()) {
printk(KERN_ERR "input.c: calling hotplug from interrupt\n");
return;
}
if (!current->fs->root) {
printk(KERN_WARNING "input.c: calling hotplug without valid filesystem\n");
return;
}
if (!(envp = (char **) kmalloc(20 * sizeof(char *), GFP_KERNEL))) {
printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
return;
}
if (!(buf = kmalloc(1024, GFP_KERNEL))) {
kfree (envp);
printk(KERN_ERR "input.c: not enough memory allocating hotplug environment\n");
return;
}

argv[0] = hotplug_path;
argv[1] = "input";
argv[2] = NULL;

envp[i++] = "HOME=/";
envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";

scratch = buf;

envp[i++] = scratch;
scratch += sprintf(scratch, "ACTION=%s", verb) + 1;

envp[i++] = scratch;
scratch += sprintf(scratch, "PRODUCT=%x/%x/%x/%x",
dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version) + 1;

if (dev->name) {
envp[i++] = scratch;
scratch += sprintf(scratch, "NAME=%s", dev->name) + 1;
}

if (dev->phys) {
envp[i++] = scratch;
scratch += sprintf(scratch, "PHYS=%s", dev->phys) + 1;
}

SPRINTF_BIT_A(evbit, "EV=", EV_MAX);
SPRINTF_BIT_A2(keybit, "KEY=", KEY_MAX, EV_KEY);
SPRINTF_BIT_A2(relbit, "REL=", REL_MAX, EV_REL);
SPRINTF_BIT_A2(absbit, "ABS=", ABS_MAX, EV_ABS);
SPRINTF_BIT_A2(mscbit, "MSC=", MSC_MAX, EV_MSC);
SPRINTF_BIT_A2(ledbit, "LED=", LED_MAX, EV_LED);
SPRINTF_BIT_A2(sndbit, "SND=", SND_MAX, EV_SND);
SPRINTF_BIT_A2(ffbit, "FF=", FF_MAX, EV_FF);
SPRINTF_BIT_A2(swbit, "SW=", SW_MAX, EV_SW);

envp[i++] = NULL;

#ifdef INPUT_DEBUG
printk(KERN_DEBUG "input.c: calling %s %s [%s %s %s %s %s]\n",
argv[0], argv[1], envp[0], envp[1], envp[2], envp[3], envp[4]);
#endif

value = call_usermodehelper(argv [0], argv, envp, 0);

kfree(buf);
kfree(envp);

#ifdef INPUT_DEBUG
if (value != 0)
printk(KERN_DEBUG "input.c: hotplug returned %d\n", value);
#endif
}

#endif

static int input_print_bitmap(char *buf, unsigned long *bitmap, int max)
static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap, int max)
{
int i;
int len = 0;
Expand All @@ -444,10 +326,8 @@ static int input_print_bitmap(char *buf, unsigned long *bitmap, int max)
break;

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

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

len += snprintf(buf + len, max(buf_size - len, 0),
"%lx%s", bitmap[i], i > 0 ? " " : "");
return len;
}

Expand All @@ -472,17 +352,18 @@ static unsigned int input_devices_poll(struct file *file, poll_table *wait)
return 0;
}

#define SPRINTF_BIT_B(ev, bm) \
#define SPRINTF_BIT(ev, bm) \
do { \
len += sprintf(buf + len, "B: %s=", #ev); \
len += input_print_bitmap(buf + len, \
len += input_print_bitmap(buf + len, INT_MAX, \
dev->bm##bit, ev##_MAX); \
len += sprintf(buf + len, "\n"); \
} while (0)

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

static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
Expand Down Expand Up @@ -511,15 +392,15 @@ static int input_devices_read(char *buf, char **start, off_t pos, int count, int

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

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

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

Expand Down Expand Up @@ -689,7 +570,7 @@ static struct attribute_group input_dev_id_attr_group = {
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); \
return input_print_bitmap(buf, PAGE_SIZE, input_dev->bm##bit, ev##_MAX);\
} \
static CLASS_DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL);

Expand Down Expand Up @@ -729,9 +610,95 @@ static void input_dev_release(struct class_device *class_dev)
module_put(THIS_MODULE);
}

/*
* Input hotplugging interface - loading event handlers based on
* device bitfields.
*/
static int input_add_hotplug_bm_var(char **envp, int num_envp, int *cur_index,
char *buffer, int buffer_size, int *cur_len,
const char *name, unsigned long *bitmap, int max)
{
if (*cur_index >= num_envp - 1)
return -ENOMEM;

envp[*cur_index] = buffer + *cur_len;

*cur_len += snprintf(buffer + *cur_len, max(buffer_size - *cur_len, 0), name);
if (*cur_len > buffer_size)
return -ENOMEM;

*cur_len += input_print_bitmap(buffer + *cur_len,
max(buffer_size - *cur_len, 0),
bitmap, max) + 1;
if (*cur_len > buffer_size)
return -ENOMEM;

(*cur_index)++;
return 0;
}

#define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
do { \
int err = add_hotplug_env_var(envp, num_envp, &i, \
buffer, buffer_size, &len, \
fmt, val); \
if (err) \
return err; \
} while (0)

#define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
do { \
int err = input_add_hotplug_bm_var(envp, num_envp, &i, \
buffer, buffer_size, &len, \
name, bm, max); \
if (err) \
return err; \
} while (0)

static int input_dev_hotplug(struct class_device *cdev, char **envp,
int num_envp, char *buffer, int buffer_size)
{
struct input_dev *dev = to_input_dev(cdev);
int i = 0;
int len = 0;

INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
dev->id.bustype, dev->id.vendor,
dev->id.product, dev->id.version);
if (dev->name)
INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
if (dev->phys)
INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
if (dev->phys)
INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);

INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
if (test_bit(EV_KEY, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
if (test_bit(EV_REL, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
if (test_bit(EV_ABS, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
if (test_bit(EV_MSC, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
if (test_bit(EV_LED, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
if (test_bit(EV_SND, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
if (test_bit(EV_FF, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
if (test_bit(EV_SW, dev->evbit))
INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);

envp[i] = NULL;

return 0;
}

struct class input_class = {
.name = "input",
.release = input_dev_release,
.hotplug = input_dev_hotplug,
};

struct input_dev *input_allocate_device(void)
Expand Down Expand Up @@ -810,10 +777,6 @@ void input_register_device(struct input_dev *dev)
input_link_handle(handle);


#ifdef CONFIG_HOTPLUG
input_call_hotplug("add", dev);
#endif

input_wakeup_procfs_readers();
}

Expand All @@ -832,10 +795,6 @@ void input_unregister_device(struct input_dev *dev)
handle->handler->disconnect(handle);
}

#ifdef CONFIG_HOTPLUG
input_call_hotplug("remove", dev);
#endif

list_del_init(&dev->node);

if (dev->dynalloc) {
Expand Down

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