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Date
From
Greg KH <gregkh@suse.de>,
Kay Sievers <kay.sievers@vrfy.org>,
Vojtech Pavlik <vojtech@suse.cz>,
Hannes Reinecke <hare@suse.de>
Subject: [patch 27/28] Input: convert input handlers to class interfaces
Content-Disposition: inline; filename=input-handlers-as-interfaces.patch
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit

Input: convert input handlers to class interfaces

Thit is exactly why class interfaces were created - to provide
several different 'views' for the same hardware.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---
drivers/input/input.c | 455 +++++++++++++++++++++++++-------------------------
include/linux/input.h | 8
2 files changed, 232 insertions(+), 231 deletions(-)
Index: work/drivers/input/input.c
===================================================================
--- work.orig/drivers/input/input.c
+++ work/drivers/input/input.c
@@ -49,9 +49,6 @@ static struct class input_class = {
.name = "input",
};

-static LIST_HEAD(input_dev_list);
-static LIST_HEAD(input_handler_list);
-
static struct input_handler *input_table[8];

void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
@@ -271,12 +268,6 @@ void input_close_device(struct input_han
up(&dev->sem);
}

-static void input_link_handle(struct input_handle *handle)
-{
- list_add_tail(&handle->d_node, &handle->dev->h_list);
- list_add_tail(&handle->h_node, &handle->handler->h_list);
-}
-
#define MATCH_BIT(bit, max) \
for (i = 0; i < NBITS(max); i++) \
if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
@@ -337,182 +328,6 @@ static int input_print_bitmap(char *buf,
return len;
}

-#ifdef CONFIG_PROC_FS
-
-static struct proc_dir_entry *proc_bus_input_dir;
-static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
-static int input_devices_state;
-
-static inline void input_wakeup_procfs_readers(void)
-{
- input_devices_state++;
- wake_up(&input_devices_poll_wait);
-}
-
-static unsigned int input_devices_poll(struct file *file, poll_table *wait)
-{
- int state = input_devices_state;
- poll_wait(file, &input_devices_poll_wait, wait);
- if (state != input_devices_state)
- return POLLIN | POLLRDNORM;
- return 0;
-}
-
-#define SPRINTF_BIT(ev, bm) \
- do { \
- len += sprintf(buf + len, "B: %s=", #ev); \
- len += input_print_bitmap(buf + len, INT_MAX, \
- dev->bm##bit, ev##_MAX); \
- len += sprintf(buf + len, "\n"); \
- } while (0)
-
-#define TEST_AND_SPRINTF_BIT(ev, bm) \
- do { \
- if (test_bit(EV_##ev, dev->evbit)) \
- SPRINTF_BIT(ev, bm); \
- } while (0)
-
-static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
-{
- struct input_dev *dev;
- struct input_handle *handle;
- const char *path;
-
- off_t at = 0;
- int len, cnt = 0;
-
- list_for_each_entry(dev, &input_dev_list, node) {
-
- path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
-
- len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
- dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
-
- len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
- len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : "");
- len += sprintf(buf + len, "S: Sysfs=%s\n", path ? path : "");
- len += sprintf(buf + len, "H: Handlers=");
-
- list_for_each_entry(handle, &dev->h_list, d_node)
- len += sprintf(buf + len, "%s ", handle->name);
-
- len += sprintf(buf + len, "\n");
-
- 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");
-
- at += len;
-
- if (at >= pos) {
- if (!*start) {
- *start = buf + (pos - (at - len));
- cnt = at - pos;
- } else cnt += len;
- buf += len;
- if (cnt >= count)
- break;
- }
-
- kfree(path);
- }
-
- if (&dev->node == &input_dev_list)
- *eof = 1;
-
- return (count > cnt) ? cnt : count;
-}
-
-static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
-{
- struct input_handler *handler;
-
- off_t at = 0;
- int len = 0, cnt = 0;
- int i = 0;
-
- list_for_each_entry(handler, &input_handler_list, node) {
-
- if (handler->fops)
- len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n",
- i++, handler->name, handler->minor);
- else
- len = sprintf(buf, "N: Number=%d Name=%s\n",
- i++, handler->name);
-
- at += len;
-
- if (at >= pos) {
- if (!*start) {
- *start = buf + (pos - (at - len));
- cnt = at - pos;
- } else cnt += len;
- buf += len;
- if (cnt >= count)
- break;
- }
- }
- if (&handler->node == &input_handler_list)
- *eof = 1;
-
- return (count > cnt) ? cnt : count;
-}
-
-static struct file_operations input_fileops;
-
-static int __init input_proc_init(void)
-{
- struct proc_dir_entry *entry;
-
- proc_bus_input_dir = proc_mkdir("input", proc_bus);
- if (!proc_bus_input_dir)
- return -ENOMEM;
-
- proc_bus_input_dir->owner = THIS_MODULE;
-
- entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL);
- if (!entry)
- goto fail1;
-
- entry->owner = THIS_MODULE;
- input_fileops = *entry->proc_fops;
- entry->proc_fops = &input_fileops;
- entry->proc_fops->poll = input_devices_poll;
-
- entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
- if (!entry)
- goto fail2;
-
- entry->owner = THIS_MODULE;
-
- return 0;
-
- fail2: remove_proc_entry("devices", proc_bus_input_dir);
- fail1: remove_proc_entry("input", proc_bus);
- return -ENOMEM;
-}
-
-static void input_proc_exit(void)
-{
- remove_proc_entry("devices", proc_bus_input_dir);
- remove_proc_entry("handlers", proc_bus_input_dir);
- remove_proc_entry("input", proc_bus);
-}
-
-#else /* !CONFIG_PROC_FS */
-static inline void input_wakeup_procfs_readers(void) { }
-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) \
{ \
@@ -710,6 +525,188 @@ static struct class input_dev_class = {
.class_dev_attrs = input_dev_attrs,
};

+#ifdef CONFIG_PROC_FS
+
+static struct proc_dir_entry *proc_bus_input_dir;
+static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
+static int input_devices_state;
+
+static inline void input_wakeup_procfs_readers(void)
+{
+ input_devices_state++;
+ wake_up(&input_devices_poll_wait);
+}
+
+static unsigned int input_devices_poll(struct file *file, poll_table *wait)
+{
+ int state = input_devices_state;
+ poll_wait(file, &input_devices_poll_wait, wait);
+ if (state != input_devices_state)
+ return POLLIN | POLLRDNORM;
+ return 0;
+}
+
+#define SPRINTF_BIT(ev, bm) \
+ do { \
+ len += sprintf(buf + len, "B: %s=", #ev); \
+ len += input_print_bitmap(buf + len, INT_MAX, \
+ dev->bm##bit, ev##_MAX); \
+ len += sprintf(buf + len, "\n"); \
+ } while (0)
+
+#define TEST_AND_SPRINTF_BIT(ev, bm) \
+ do { \
+ if (test_bit(EV_##ev, dev->evbit)) \
+ SPRINTF_BIT(ev, bm); \
+ } while (0)
+
+static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
+{
+ struct list_head *node;
+ struct input_dev *dev;
+ struct input_handle *handle;
+ const char *path;
+
+ off_t at = 0;
+ int len, cnt = 0;
+
+ list_for_each(node, &input_dev_class.children) {
+
+ dev = to_input_dev(container_of(node, struct class_device, node));
+ path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
+
+ len = sprintf(buf, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
+ dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
+
+ len += sprintf(buf + len, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
+ len += sprintf(buf + len, "P: Phys=%s\n", dev->phys ? dev->phys : "");
+ len += sprintf(buf + len, "S: Sysfs=%s\n", path ? path : "");
+ len += sprintf(buf + len, "H: Handlers=");
+
+ list_for_each_entry(handle, &dev->h_list, d_node)
+ len += sprintf(buf + len, "%s ", handle->name);
+
+ len += sprintf(buf + len, "\n");
+
+ 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");
+
+ at += len;
+
+ if (at >= pos) {
+ if (!*start) {
+ *start = buf + (pos - (at - len));
+ cnt = at - pos;
+ } else cnt += len;
+ buf += len;
+ if (cnt >= count)
+ break;
+ }
+
+ kfree(path);
+ }
+
+ if (node == &input_dev_class.children)
+ *eof = 1;
+
+ return (count > cnt) ? cnt : count;
+}
+
+static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
+{
+ struct list_head *node;
+ struct input_handler *handler;
+
+ off_t at = 0;
+ int len = 0, cnt = 0;
+ int i = 0;
+
+ list_for_each(node, &input_dev_class.interfaces) {
+
+ handler = to_input_handler(container_of(node, struct class_interface, node));
+
+ if (handler->fops)
+ len = sprintf(buf, "N: Number=%d Name=%s Minor=%d\n",
+ i++, handler->name, handler->minor);
+ else
+ len = sprintf(buf, "N: Number=%d Name=%s\n",
+ i++, handler->name);
+
+ at += len;
+
+ if (at >= pos) {
+ if (!*start) {
+ *start = buf + (pos - (at - len));
+ cnt = at - pos;
+ } else cnt += len;
+ buf += len;
+ if (cnt >= count)
+ break;
+ }
+ }
+
+ if (node == &input_dev_class.interfaces)
+ *eof = 1;
+
+ return (count > cnt) ? cnt : count;
+}
+
+static struct file_operations input_fileops;
+
+static int __init input_proc_init(void)
+{
+ struct proc_dir_entry *entry;
+
+ proc_bus_input_dir = proc_mkdir("input", proc_bus);
+ if (!proc_bus_input_dir)
+ return -ENOMEM;
+
+ proc_bus_input_dir->owner = THIS_MODULE;
+
+ entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL);
+ if (!entry)
+ goto fail1;
+
+ entry->owner = THIS_MODULE;
+ input_fileops = *entry->proc_fops;
+ entry->proc_fops = &input_fileops;
+ entry->proc_fops->poll = input_devices_poll;
+
+ entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
+ if (!entry)
+ goto fail2;
+
+ entry->owner = THIS_MODULE;
+
+ return 0;
+
+ fail2: remove_proc_entry("devices", proc_bus_input_dir);
+ fail1: remove_proc_entry("input", proc_bus);
+ return -ENOMEM;
+}
+
+static void input_proc_exit(void)
+{
+ remove_proc_entry("devices", proc_bus_input_dir);
+ remove_proc_entry("handlers", proc_bus_input_dir);
+ remove_proc_entry("input", proc_bus);
+}
+
+#else /* !CONFIG_PROC_FS */
+static inline void input_wakeup_procfs_readers(void) { }
+static inline int input_proc_init(void) { return 0; }
+static inline void input_proc_exit(void) { }
+#endif
+
struct input_dev *input_allocate_device(void)
{
struct input_dev *dev;
@@ -718,7 +715,6 @@ struct input_dev *input_allocate_device(
if (dev) {
dev->dynalloc = 1;
INIT_LIST_HEAD(&dev->h_list);
- INIT_LIST_HEAD(&dev->node);
}

return dev;
@@ -727,9 +723,6 @@ struct input_dev *input_allocate_device(
int input_register_device(struct input_dev *dev)
{
static atomic_t input_no = ATOMIC_INIT(0);
- struct input_handle *handle;
- struct input_handler *handler;
- struct input_device_id *id;
const char *path;
int error;

@@ -757,13 +750,6 @@ int input_register_device(struct input_d
}

INIT_LIST_HEAD(&dev->h_list);
- list_add_tail(&dev->node, &input_dev_list);
-
- list_for_each_entry(handler, &input_handler_list, node)
- if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
- if ((id = input_match_device(handler->id_table, dev)))
- if ((handle = handler->connect(handler, dev, id)))
- input_link_handle(handle);

dev->cdev.class = &input_dev_class;
snprintf(dev->cdev.class_id, sizeof(dev->cdev.class_id),
@@ -799,19 +785,8 @@ int input_register_device(struct input_d

void input_unregister_device(struct input_dev *dev)
{
- struct list_head * node, * next;
-
del_timer_sync(&dev->timer);

- list_for_each_safe(node, next, &dev->h_list) {
- struct input_handle * handle = to_handle(node);
- list_del_init(&handle->d_node);
- list_del_init(&handle->h_node);
- handle->handler->disconnect(handle);
- }
-
- list_del_init(&dev->node);
-
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);
@@ -819,46 +794,72 @@ void input_unregister_device(struct inpu
input_wakeup_procfs_readers();
}

-void input_register_handler(struct input_handler *handler)
+static int input_handler_add_device(struct class_device *cdev, struct class_interface *intf)
{
- struct input_dev *dev;
+ struct input_dev *dev = to_input_dev(cdev);
+ struct input_handler *handler = to_input_handler(intf);
struct input_handle *handle;
struct input_device_id *id;

- if (!handler) return;
+ if (!handler->blacklist || !input_match_device(handler->blacklist, dev)) {
+ id = input_match_device(handler->id_table, dev);
+ if (id) {
+ handle = handler->connect(handler, dev, id);
+ if (handle) {
+ list_add_tail(&handle->d_node, &dev->h_list);
+ list_add_tail(&handle->h_node, &handler->h_list);
+ return 0;
+ }
+ }
+ }
+
+ return -ENODEV;
+}
+
+static void input_handler_remove_device(struct class_device *cdev, struct class_interface *intf)
+{
+ struct input_dev *dev = to_input_dev(cdev);
+ struct input_handler *handler = to_input_handler(intf);
+ struct input_handle *handle, *next;
+
+ list_for_each_entry_safe(handle, next, &dev->h_list, d_node) {
+ if (handle->handler == handler) {
+ list_del_init(&handle->h_node);
+ list_del_init(&handle->d_node);
+ handler->disconnect(handle);
+ }
+ }
+}
+
+int input_register_handler(struct input_handler *handler)
+{
+ int error;

INIT_LIST_HEAD(&handler->h_list);

if (handler->fops != NULL)
input_table[handler->minor >> 5] = handler;

- list_add_tail(&handler->node, &input_handler_list);
+ handler->intf.class = &input_dev_class;
+ handler->intf.add = input_handler_add_device;
+ handler->intf.remove = input_handler_remove_device;

- list_for_each_entry(dev, &input_dev_list, node)
- if (!handler->blacklist || !input_match_device(handler->blacklist, dev))
- if ((id = input_match_device(handler->id_table, dev)))
- if ((handle = handler->connect(handler, dev, id)))
- input_link_handle(handle);
+ error = class_interface_register(&handler->intf);
+ if (error)
+ return error;

input_wakeup_procfs_readers();
+
+ return 0;
}

void input_unregister_handler(struct input_handler *handler)
{
- struct list_head * node, * next;
-
- list_for_each_safe(node, next, &handler->h_list) {
- struct input_handle * handle = to_handle_h(node);
- list_del_init(&handle->h_node);
- list_del_init(&handle->d_node);
- handler->disconnect(handle);
- }
-
- list_del_init(&handler->node);
-
if (handler->fops != NULL)
input_table[handler->minor >> 5] = NULL;

+ class_interface_unregister(&handler->intf);
+
input_wakeup_procfs_readers();
}

Index: work/include/linux/input.h
===================================================================
--- work.orig/include/linux/input.h
+++ work/include/linux/input.h
@@ -895,7 +895,6 @@ struct input_dev {
int dynalloc; /* temporarily */

struct list_head h_list;
- struct list_head node;
};
#define to_input_dev(d) container_of(d, struct input_dev, cdev)

@@ -960,8 +959,10 @@ struct input_handler {
struct input_device_id *blacklist;

struct list_head h_list;
- struct list_head node;
+
+ struct class_interface intf;
};
+#define to_input_handler(h) container_of(h, struct input_handler, intf)

struct input_handle {

@@ -986,7 +987,6 @@ struct input_handle {
static inline void init_input_dev(struct input_dev *dev)
{
INIT_LIST_HEAD(&dev->h_list);
- INIT_LIST_HEAD(&dev->node);
}

struct input_dev *input_allocate_device(void);
@@ -1009,7 +1009,7 @@ static inline void input_put_device(stru
int input_register_device(struct input_dev *);
void input_unregister_device(struct input_dev *);

-void input_register_handler(struct input_handler *);
+int input_register_handler(struct input_handler *);
void input_unregister_handler(struct input_handler *);

int input_create_interface_device(struct input_handle *, dev_t);
-
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