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Diffstat (limited to 'drivers/hid/hid-debug.c')
-rw-r--r--drivers/hid/hid-debug.c439
1 files changed, 363 insertions, 76 deletions
diff --git a/drivers/hid/hid-debug.c b/drivers/hid/hid-debug.c
index 04359ed64b87..6abd0369aedb 100644
--- a/drivers/hid/hid-debug.c
+++ b/drivers/hid/hid-debug.c
@@ -1,9 +1,9 @@
/*
* (c) 1999 Andreas Gal <gal@cs.uni-magdeburg.de>
* (c) 2000-2001 Vojtech Pavlik <vojtech@ucw.cz>
- * (c) 2007 Jiri Kosina
+ * (c) 2007-2009 Jiri Kosina
*
- * Some debug stuff for the HID parser.
+ * HID debugging support
*/
/*
@@ -26,9 +26,17 @@
* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
*/
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/sched.h>
+#include <linux/uaccess.h>
+#include <linux/poll.h>
+
#include <linux/hid.h>
#include <linux/hid-debug.h>
+static struct dentry *hid_debug_root;
+
struct hid_usage_entry {
unsigned page;
unsigned usage;
@@ -339,72 +347,120 @@ static const struct hid_usage_entry hid_usage_table[] = {
{ 0, 0, NULL }
};
-static void resolv_usage_page(unsigned page) {
+/* Either output directly into simple seq_file, or (if f == NULL)
+ * allocate a separate buffer that will then be passed to the 'events'
+ * ringbuffer.
+ *
+ * This is because these functions can be called both for "one-shot"
+ * "rdesc" while resolving, or for blocking "events".
+ *
+ * This holds both for resolv_usage_page() and hid_resolv_usage().
+ */
+static char *resolv_usage_page(unsigned page, struct seq_file *f) {
const struct hid_usage_entry *p;
+ char *buf = NULL;
+
+ if (!f) {
+ buf = kzalloc(sizeof(char) * HID_DEBUG_BUFSIZE, GFP_ATOMIC);
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+ }
for (p = hid_usage_table; p->description; p++)
if (p->page == page) {
- printk("%s", p->description);
- return;
+ if (!f) {
+ snprintf(buf, HID_DEBUG_BUFSIZE, "%s",
+ p->description);
+ return buf;
+ }
+ else {
+ seq_printf(f, "%s", p->description);
+ return NULL;
+ }
}
- printk("%04x", page);
+ if (!f)
+ snprintf(buf, HID_DEBUG_BUFSIZE, "%04x", page);
+ else
+ seq_printf(f, "%04x", page);
+ return buf;
}
-void hid_resolv_usage(unsigned usage) {
+char *hid_resolv_usage(unsigned usage, struct seq_file *f) {
const struct hid_usage_entry *p;
+ char *buf = NULL;
+ int len = 0;
+
+ buf = resolv_usage_page(usage >> 16, f);
+ if (IS_ERR(buf)) {
+ printk(KERN_ERR "error allocating HID debug buffer\n");
+ return NULL;
+ }
- if (!hid_debug)
- return;
- resolv_usage_page(usage >> 16);
- printk(".");
+ if (!f) {
+ len = strlen(buf);
+ snprintf(buf+len, max(0, HID_DEBUG_BUFSIZE - len), ".");
+ len++;
+ }
+ else {
+ seq_printf(f, ".");
+ }
for (p = hid_usage_table; p->description; p++)
if (p->page == (usage >> 16)) {
for(++p; p->description && p->usage != 0; p++)
if (p->usage == (usage & 0xffff)) {
- printk("%s", p->description);
- return;
+ if (!f)
+ snprintf(buf + len,
+ max(0,HID_DEBUG_BUFSIZE - len - 1),
+ "%s", p->description);
+ else
+ seq_printf(f,
+ "%s",
+ p->description);
+ return buf;
}
break;
}
- printk("%04x", usage & 0xffff);
+ if (!f)
+ snprintf(buf + len, max(0, HID_DEBUG_BUFSIZE - len - 1),
+ "%04x", usage & 0xffff);
+ else
+ seq_printf(f, "%04x", usage & 0xffff);
+ return buf;
}
EXPORT_SYMBOL_GPL(hid_resolv_usage);
-static void tab(int n) {
- printk(KERN_DEBUG "%*s", n, "");
+static void tab(int n, struct seq_file *f) {
+ seq_printf(f, "%*s", n, "");
}
-void hid_dump_field(struct hid_field *field, int n) {
+void hid_dump_field(struct hid_field *field, int n, struct seq_file *f) {
int j;
- if (!hid_debug)
- return;
-
if (field->physical) {
- tab(n);
- printk("Physical(");
- hid_resolv_usage(field->physical); printk(")\n");
+ tab(n, f);
+ seq_printf(f, "Physical(");
+ hid_resolv_usage(field->physical, f); seq_printf(f, ")\n");
}
if (field->logical) {
- tab(n);
- printk("Logical(");
- hid_resolv_usage(field->logical); printk(")\n");
+ tab(n, f);
+ seq_printf(f, "Logical(");
+ hid_resolv_usage(field->logical, f); seq_printf(f, ")\n");
}
- tab(n); printk("Usage(%d)\n", field->maxusage);
+ tab(n, f); seq_printf(f, "Usage(%d)\n", field->maxusage);
for (j = 0; j < field->maxusage; j++) {
- tab(n+2); hid_resolv_usage(field->usage[j].hid); printk("\n");
+ tab(n+2, f); hid_resolv_usage(field->usage[j].hid, f); seq_printf(f, "\n");
}
if (field->logical_minimum != field->logical_maximum) {
- tab(n); printk("Logical Minimum(%d)\n", field->logical_minimum);
- tab(n); printk("Logical Maximum(%d)\n", field->logical_maximum);
+ tab(n, f); seq_printf(f, "Logical Minimum(%d)\n", field->logical_minimum);
+ tab(n, f); seq_printf(f, "Logical Maximum(%d)\n", field->logical_maximum);
}
if (field->physical_minimum != field->physical_maximum) {
- tab(n); printk("Physical Minimum(%d)\n", field->physical_minimum);
- tab(n); printk("Physical Maximum(%d)\n", field->physical_maximum);
+ tab(n, f); seq_printf(f, "Physical Minimum(%d)\n", field->physical_minimum);
+ tab(n, f); seq_printf(f, "Physical Maximum(%d)\n", field->physical_maximum);
}
if (field->unit_exponent) {
- tab(n); printk("Unit Exponent(%d)\n", field->unit_exponent);
+ tab(n, f); seq_printf(f, "Unit Exponent(%d)\n", field->unit_exponent);
}
if (field->unit) {
static const char *systems[5] = { "None", "SI Linear", "SI Rotation", "English Linear", "English Rotation" };
@@ -425,77 +481,75 @@ void hid_dump_field(struct hid_field *field, int n) {
data >>= 4;
if(sys > 4) {
- tab(n); printk("Unit(Invalid)\n");
+ tab(n, f); seq_printf(f, "Unit(Invalid)\n");
}
else {
int earlier_unit = 0;
- tab(n); printk("Unit(%s : ", systems[sys]);
+ tab(n, f); seq_printf(f, "Unit(%s : ", systems[sys]);
for (i=1 ; i<sizeof(__u32)*2 ; i++) {
char nibble = data & 0xf;
data >>= 4;
if (nibble != 0) {
if(earlier_unit++ > 0)
- printk("*");
- printk("%s", units[sys][i]);
+ seq_printf(f, "*");
+ seq_printf(f, "%s", units[sys][i]);
if(nibble != 1) {
/* This is a _signed_ nibble(!) */
int val = nibble & 0x7;
if(nibble & 0x08)
val = -((0x7 & ~val) +1);
- printk("^%d", val);
+ seq_printf(f, "^%d", val);
}
}
}
- printk(")\n");
+ seq_printf(f, ")\n");
}
}
- tab(n); printk("Report Size(%u)\n", field->report_size);
- tab(n); printk("Report Count(%u)\n", field->report_count);
- tab(n); printk("Report Offset(%u)\n", field->report_offset);
+ tab(n, f); seq_printf(f, "Report Size(%u)\n", field->report_size);
+ tab(n, f); seq_printf(f, "Report Count(%u)\n", field->report_count);
+ tab(n, f); seq_printf(f, "Report Offset(%u)\n", field->report_offset);
- tab(n); printk("Flags( ");
+ tab(n, f); seq_printf(f, "Flags( ");
j = field->flags;
- printk("%s", HID_MAIN_ITEM_CONSTANT & j ? "Constant " : "");
- printk("%s", HID_MAIN_ITEM_VARIABLE & j ? "Variable " : "Array ");
- printk("%s", HID_MAIN_ITEM_RELATIVE & j ? "Relative " : "Absolute ");
- printk("%s", HID_MAIN_ITEM_WRAP & j ? "Wrap " : "");
- printk("%s", HID_MAIN_ITEM_NONLINEAR & j ? "NonLinear " : "");
- printk("%s", HID_MAIN_ITEM_NO_PREFERRED & j ? "NoPreferredState " : "");
- printk("%s", HID_MAIN_ITEM_NULL_STATE & j ? "NullState " : "");
- printk("%s", HID_MAIN_ITEM_VOLATILE & j ? "Volatile " : "");
- printk("%s", HID_MAIN_ITEM_BUFFERED_BYTE & j ? "BufferedByte " : "");
- printk(")\n");
+ seq_printf(f, "%s", HID_MAIN_ITEM_CONSTANT & j ? "Constant " : "");
+ seq_printf(f, "%s", HID_MAIN_ITEM_VARIABLE & j ? "Variable " : "Array ");
+ seq_printf(f, "%s", HID_MAIN_ITEM_RELATIVE & j ? "Relative " : "Absolute ");
+ seq_printf(f, "%s", HID_MAIN_ITEM_WRAP & j ? "Wrap " : "");
+ seq_printf(f, "%s", HID_MAIN_ITEM_NONLINEAR & j ? "NonLinear " : "");
+ seq_printf(f, "%s", HID_MAIN_ITEM_NO_PREFERRED & j ? "NoPreferredState " : "");
+ seq_printf(f, "%s", HID_MAIN_ITEM_NULL_STATE & j ? "NullState " : "");
+ seq_printf(f, "%s", HID_MAIN_ITEM_VOLATILE & j ? "Volatile " : "");
+ seq_printf(f, "%s", HID_MAIN_ITEM_BUFFERED_BYTE & j ? "BufferedByte " : "");
+ seq_printf(f, ")\n");
}
EXPORT_SYMBOL_GPL(hid_dump_field);
-void hid_dump_device(struct hid_device *device) {
+void hid_dump_device(struct hid_device *device, struct seq_file *f)
+{
struct hid_report_enum *report_enum;
struct hid_report *report;
struct list_head *list;
unsigned i,k;
static const char *table[] = {"INPUT", "OUTPUT", "FEATURE"};
- if (!hid_debug)
- return;
-
for (i = 0; i < HID_REPORT_TYPES; i++) {
report_enum = device->report_enum + i;
list = report_enum->report_list.next;
while (list != &report_enum->report_list) {
report = (struct hid_report *) list;
- tab(2);
- printk("%s", table[i]);
+ tab(2, f);
+ seq_printf(f, "%s", table[i]);
if (report->id)
- printk("(%d)", report->id);
- printk("[%s]", table[report->type]);
- printk("\n");
+ seq_printf(f, "(%d)", report->id);
+ seq_printf(f, "[%s]", table[report->type]);
+ seq_printf(f, "\n");
for (k = 0; k < report->maxfield; k++) {
- tab(4);
- printk("Field(%d)\n", k);
- hid_dump_field(report->field[k], 6);
+ tab(4, f);
+ seq_printf(f, "Field(%d)\n", k);
+ hid_dump_field(report->field[k], 6, f);
}
list = list->next;
}
@@ -503,13 +557,37 @@ void hid_dump_device(struct hid_device *device) {
}
EXPORT_SYMBOL_GPL(hid_dump_device);
-void hid_dump_input(struct hid_usage *usage, __s32 value) {
- if (hid_debug < 2)
+/* enqueue string to 'events' ring buffer */
+void hid_debug_event(struct hid_device *hdev, char *buf)
+{
+ int i;
+ struct hid_debug_list *list;
+
+ list_for_each_entry(list, &hdev->debug_list, node) {
+ for (i = 0; i <= strlen(buf); i++)
+ list->hid_debug_buf[(list->tail + i) % (HID_DEBUG_BUFSIZE - 1)] =
+ buf[i];
+ list->tail = (list->tail + i) % (HID_DEBUG_BUFSIZE - 1);
+ }
+}
+EXPORT_SYMBOL_GPL(hid_debug_event);
+
+void hid_dump_input(struct hid_device *hdev, struct hid_usage *usage, __s32 value)
+{
+ char *buf;
+ int len;
+
+ buf = hid_resolv_usage(usage->hid, NULL);
+ if (!buf)
return;
+ len = strlen(buf);
+ snprintf(buf + len, HID_DEBUG_BUFSIZE - len - 1, " = %d\n", value);
+
+ hid_debug_event(hdev, buf);
+
+ kfree(buf);
+ wake_up_interruptible(&hdev->debug_wait);
- printk(KERN_DEBUG "hid-debug: input ");
- hid_resolv_usage(usage->hid);
- printk(" = %d\n", value);
}
EXPORT_SYMBOL_GPL(hid_dump_input);
@@ -786,12 +864,221 @@ static const char **names[EV_MAX + 1] = {
[EV_SND] = sounds, [EV_REP] = repeats,
};
-void hid_resolv_event(__u8 type, __u16 code) {
+void hid_resolv_event(__u8 type, __u16 code, struct seq_file *f) {
- if (!hid_debug)
- return;
-
- printk("%s.%s", events[type] ? events[type] : "?",
+ seq_printf(f, "%s.%s", events[type] ? events[type] : "?",
names[type] ? (names[type][code] ? names[type][code] : "?") : "?");
}
-EXPORT_SYMBOL_GPL(hid_resolv_event);
+
+void hid_dump_input_mapping(struct hid_device *hid, struct seq_file *f)
+{
+ int i, j, k;
+ struct hid_report *report;
+ struct hid_usage *usage;
+
+ for (k = HID_INPUT_REPORT; k <= HID_OUTPUT_REPORT; k++) {
+ list_for_each_entry(report, &hid->report_enum[k].report_list, list) {
+ for (i = 0; i < report->maxfield; i++) {
+ for ( j = 0; j < report->field[i]->maxusage; j++) {
+ usage = report->field[i]->usage + j;
+ hid_resolv_usage(usage->hid, f);
+ seq_printf(f, " ---> ");
+ hid_resolv_event(usage->type, usage->code, f);
+ seq_printf(f, "\n");
+ }
+ }
+ }
+ }
+
+}
+
+
+static int hid_debug_rdesc_show(struct seq_file *f, void *p)
+{
+ struct hid_device *hdev = f->private;
+ int i;
+
+ /* dump HID report descriptor */
+ for (i = 0; i < hdev->rsize; i++)
+ seq_printf(f, "%02x ", hdev->rdesc[i]);
+ seq_printf(f, "\n\n");
+
+ /* dump parsed data and input mappings */
+ hid_dump_device(hdev, f);
+ seq_printf(f, "\n");
+ hid_dump_input_mapping(hdev, f);
+
+ return 0;
+}
+
+static int hid_debug_rdesc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, hid_debug_rdesc_show, inode->i_private);
+}
+
+static int hid_debug_events_open(struct inode *inode, struct file *file)
+{
+ int err = 0;
+ struct hid_debug_list *list;
+
+ if (!(list = kzalloc(sizeof(struct hid_debug_list), GFP_KERNEL))) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ if (!(list->hid_debug_buf = kzalloc(sizeof(char) * HID_DEBUG_BUFSIZE, GFP_KERNEL))) {
+ err = -ENOMEM;
+ kfree(list);
+ goto out;
+ }
+ list->hdev = (struct hid_device *) inode->i_private;
+ file->private_data = list;
+ mutex_init(&list->read_mutex);
+
+ list_add_tail(&list->node, &list->hdev->debug_list);
+
+out:
+ return err;
+}
+
+static ssize_t hid_debug_events_read(struct file *file, char __user *buffer,
+ size_t count, loff_t *ppos)
+{
+ struct hid_debug_list *list = file->private_data;
+ int ret = 0, len;
+ DECLARE_WAITQUEUE(wait, current);
+
+ while (ret == 0) {
+ mutex_lock(&list->read_mutex);
+ if (list->head == list->tail) {
+ add_wait_queue(&list->hdev->debug_wait, &wait);
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ while (list->head == list->tail) {
+ if (file->f_flags & O_NONBLOCK) {
+ ret = -EAGAIN;
+ break;
+ }
+ if (signal_pending(current)) {
+ ret = -ERESTARTSYS;
+ break;
+ }
+
+ if (!list->hdev || !list->hdev->debug) {
+ ret = -EIO;
+ break;
+ }
+
+ /* allow O_NONBLOCK from other threads */
+ mutex_unlock(&list->read_mutex);
+ schedule();
+ mutex_lock(&list->read_mutex);
+ set_current_state(TASK_INTERRUPTIBLE);
+ }
+
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&list->hdev->debug_wait, &wait);
+ }
+
+ if (ret)
+ goto out;
+
+ /* pass the ringbuffer contents to userspace */
+copy_rest:
+ if (list->tail == list->head)
+ goto out;
+ if (list->tail > list->head) {
+ len = list->tail - list->head;
+
+ if (copy_to_user(buffer + ret, &list->hid_debug_buf[list->head], len)) {
+ ret = -EFAULT;
+ goto out;
+ }
+ ret += len;
+ list->head += len;
+ } else {
+ len = HID_DEBUG_BUFSIZE - list->head;
+
+ if (copy_to_user(buffer, &list->hid_debug_buf[list->head], len)) {
+ ret = -EFAULT;
+ goto out;
+ }
+ list->head = 0;
+ ret += len;
+ goto copy_rest;
+ }
+
+ }
+out:
+ mutex_unlock(&list->read_mutex);
+ return ret;
+}
+
+static unsigned int hid_debug_events_poll(struct file *file, poll_table *wait)
+{
+ struct hid_debug_list *list = file->private_data;
+
+ poll_wait(file, &list->hdev->debug_wait, wait);
+ if (list->head != list->tail)
+ return POLLIN | POLLRDNORM;
+ if (!list->hdev->debug)
+ return POLLERR | POLLHUP;
+ return 0;
+}
+
+static int hid_debug_events_release(struct inode *inode, struct file *file)
+{
+ struct hid_debug_list *list = file->private_data;
+
+ list_del(&list->node);
+ kfree(list->hid_debug_buf);
+ kfree(list);
+
+ return 0;
+}
+
+static const struct file_operations hid_debug_rdesc_fops = {
+ .open = hid_debug_rdesc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static const struct file_operations hid_debug_events_fops = {
+ .owner = THIS_MODULE,
+ .open = hid_debug_events_open,
+ .read = hid_debug_events_read,
+ .poll = hid_debug_events_poll,
+ .release = hid_debug_events_release,
+};
+
+
+void hid_debug_register(struct hid_device *hdev, const char *name)
+{
+ hdev->debug_dir = debugfs_create_dir(name, hid_debug_root);
+ hdev->debug_rdesc = debugfs_create_file("rdesc", 0400,
+ hdev->debug_dir, hdev, &hid_debug_rdesc_fops);
+ hdev->debug_events = debugfs_create_file("events", 0400,
+ hdev->debug_dir, hdev, &hid_debug_events_fops);
+ hdev->debug = 1;
+}
+
+void hid_debug_unregister(struct hid_device *hdev)
+{
+ hdev->debug = 0;
+ wake_up_interruptible(&hdev->debug_wait);
+ debugfs_remove(hdev->debug_rdesc);
+ debugfs_remove(hdev->debug_events);
+ debugfs_remove(hdev->debug_dir);
+}
+
+void hid_debug_init(void)
+{
+ hid_debug_root = debugfs_create_dir("hid", NULL);
+}
+
+void hid_debug_exit(void)
+{
+ debugfs_remove_recursive(hid_debug_root);
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 07:29:55 +0000