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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 28/28] Input: convert to seq_file
Content-Disposition: inline; filename=input-proc-seq-file.patch
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit

Input: convert /proc handling to seq_file

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---
drivers/input/input.c | 239 +++++++++++++++++++++++++++++++-------------------
1 files changed, 150 insertions(+), 89 deletions(-)
Index: work/drivers/input/input.c
===================================================================
--- work.orig/drivers/input/input.c
+++ work/drivers/input/input.c
@@ -18,6 +18,7 @@
#include <linux/random.h>
#include <linux/major.h>
#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
#include <linux/kobject_uevent.h>
#include <linux/interrupt.h>
#include <linux/poll.h>
@@ -537,7 +538,7 @@ static inline void input_wakeup_procfs_r
wake_up(&input_devices_poll_wait);
}

-static unsigned int input_devices_poll(struct file *file, poll_table *wait)
+static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
{
int state = input_devices_state;
poll_wait(file, &input_devices_poll_wait, wait);
@@ -546,121 +547,182 @@ static unsigned int input_devices_poll(s
return 0;
}

-#define SPRINTF_BIT(ev, bm) \
+static struct list_head *list_get_nth_element(struct list_head *list, loff_t *pos)
+{
+ struct list_head *node;
+ loff_t i = 0;
+
+ list_for_each(node, list)
+ if (i++ == *pos)
+ return node;
+
+ return NULL;
+}
+
+static struct list_head *list_get_next_element(struct list_head *list, struct list_head *element, loff_t *pos)
+{
+ if (element->next == list)
+ return NULL;
+
+ ++(*pos);
+ return element->next;
+}
+
+static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ down(&input_dev_class.sem);
+ return list_get_nth_element(&input_dev_class.children, pos);
+}
+
+static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ return list_get_next_element(&input_dev_class.children, v, pos);
+}
+
+static void input_devices_seq_stop(struct seq_file *seq, void *v)
+{
+ up(&input_dev_class.sem);
+}
+
+static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
+ unsigned long *bitmap, int max)
+{
+ int i;
+
+ for (i = NBITS(max) - 1; i > 0; i--)
+ if (bitmap[i])
+ break;
+
+ seq_printf(seq, "B: %s=", name);
+ for (; i >= 0; i--)
+ seq_printf(seq, "%lx%s", bitmap[i], i > 0 ? " " : "");
+ seq_putc(seq, '\n');
+}
+
+#define SEQ_PRINTF_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"); \
+ input_seq_print_bitmap(seq, #ev, \
+ dev->bm##bit, ev##_MAX); \
} while (0)

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

-static int input_devices_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
+static int input_devices_seq_show(struct seq_file *seq, void *v)
{
- struct list_head *node;
- struct input_dev *dev;
+ struct class_device *cdev = container_of(v, struct class_device, node);
+ struct input_dev *dev = to_input_dev(cdev);
+ const char *path = kobject_get_path(&cdev->kobj, GFP_KERNEL);
struct input_handle *handle;
- const char *path;

- off_t at = 0;
- int len, cnt = 0;
+ seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
+ dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);

- list_for_each(node, &input_dev_class.children) {
+ seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
+ seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
+ seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
+ seq_printf(seq, "H: Handlers=");
+
+ list_for_each_entry(handle, &dev->h_list, d_node)
+ seq_printf(seq, "%s ", handle->name);
+ seq_putc(seq, '\n');
+
+ SEQ_PRINTF_BIT(EV, ev);
+ TEST_AND_SEQ_PRINTF_BIT(KEY, key);
+ TEST_AND_SEQ_PRINTF_BIT(REL, rel);
+ TEST_AND_SEQ_PRINTF_BIT(ABS, abs);
+ TEST_AND_SEQ_PRINTF_BIT(MSC, msc);
+ TEST_AND_SEQ_PRINTF_BIT(LED, led);
+ TEST_AND_SEQ_PRINTF_BIT(SND, snd);
+ TEST_AND_SEQ_PRINTF_BIT(FF, ff);
+ TEST_AND_SEQ_PRINTF_BIT(SW, sw);

- dev = to_input_dev(container_of(node, struct class_device, node));
- path = kobject_get_path(&dev->cdev.kobj, GFP_KERNEL);
+ seq_putc(seq, '\n');

- 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=");
+ kfree(path);
+ return 0;
+}

- list_for_each_entry(handle, &dev->h_list, d_node)
- len += sprintf(buf + len, "%s ", handle->name);
+static struct seq_operations input_devices_seq_ops = {
+ .start = input_devices_seq_start,
+ .next = input_devices_seq_next,
+ .stop = input_devices_seq_stop,
+ .show = input_devices_seq_show,
+};

- len += sprintf(buf + len, "\n");
+static int input_proc_devices_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &input_devices_seq_ops);
+}

- 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;
- }
+static struct file_operations input_devices_fileops = {
+ .owner = THIS_MODULE,
+ .open = input_proc_devices_open,
+ .poll = input_proc_devices_poll,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};

- kfree(path);
- }
+static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ down(&input_dev_class.sem);
+ return list_get_nth_element(&input_dev_class.interfaces, pos);
+}

- if (node == &input_dev_class.children)
- *eof = 1;
+static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ return list_get_next_element(&input_dev_class.interfaces, v, pos);
+}

- return (count > cnt) ? cnt : count;
+static void input_handlers_seq_stop(struct seq_file *seq, void *v)
+{
+ up(&input_dev_class.sem);
}

-static int input_handlers_read(char *buf, char **start, off_t pos, int count, int *eof, void *data)
+static int input_handlers_seq_show(struct seq_file *seq, void *v)
{
+ struct class_interface *intf = container_of(v, struct class_interface, node);
+ struct input_handler *handler = to_input_handler(intf);
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) {
+ if (node == v)
+ break;
+ i++;
+ }

- handler = to_input_handler(container_of(node, struct class_interface, node));
+ seq_printf(seq, "N: Number=%d Name=%s", i, handler->name);
+ if (handler->fops)
+ seq_printf(seq, " Minor=%d", handler->minor);
+ seq_putc(seq, '\n');

- 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;
- }
- }
+ return 0;
+}

- if (node == &input_dev_class.interfaces)
- *eof = 1;
+static struct seq_operations input_handlers_seq_ops = {
+ .start = input_handlers_seq_start,
+ .next = input_handlers_seq_next,
+ .stop = input_handlers_seq_stop,
+ .show = input_handlers_seq_show,
+};

- return (count > cnt) ? cnt : count;
+static int input_proc_handlers_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &input_handlers_seq_ops);
}

-static struct file_operations input_fileops;
+static struct file_operations input_handlers_fileops = {
+ .owner = THIS_MODULE,
+ .open = input_proc_handlers_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};

static int __init input_proc_init(void)
{
@@ -672,20 +734,19 @@ static int __init input_proc_init(void)

proc_bus_input_dir->owner = THIS_MODULE;

- entry = create_proc_read_entry("devices", 0, proc_bus_input_dir, input_devices_read, NULL);
+ entry = create_proc_entry("devices", 0, proc_bus_input_dir);
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->proc_fops = &input_devices_fileops;

- entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
+ entry = create_proc_entry("handlers", 0, proc_bus_input_dir);
if (!entry)
goto fail2;

entry->owner = THIS_MODULE;
+ entry->proc_fops = &input_handlers_fileops;

return 0;

-
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