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authorDavid Herrmann <dh.herrmann@googlemail.com>2011-11-17 14:12:12 +0100
committerJiri Kosina <jkosina@suse.cz>2011-11-22 23:11:10 +0100
commit43d782ae80b82667d66010d0d82aa80893a48d12 (patch)
treed757170b529aed0068bd987522b5c3e1aa32babe /drivers/hid/hid-wiimote-debug.c
parent1d3452c63d4b62329d34d7634f67a3dbec21ca87 (diff)
downloadlinux-43d782ae80b82667d66010d0d82aa80893a48d12.tar.bz2
HID: wiimote: Allow direct DRM debug access
Keep track of current drm and add new debugfs file which reads or writes the current DRM. Signed-off-by: David Herrmann <dh.herrmann@googlemail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-wiimote-debug.c')
-rw-r--r--drivers/hid/hid-wiimote-debug.c107
1 files changed, 103 insertions, 4 deletions
diff --git a/drivers/hid/hid-wiimote-debug.c b/drivers/hid/hid-wiimote-debug.c
index f81243c86790..17dabc1f339e 100644
--- a/drivers/hid/hid-wiimote-debug.c
+++ b/drivers/hid/hid-wiimote-debug.c
@@ -12,6 +12,7 @@
#include <linux/debugfs.h>
#include <linux/module.h>
+#include <linux/seq_file.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include "hid-wiimote.h"
@@ -19,6 +20,7 @@
struct wiimote_debug {
struct wiimote_data *wdata;
struct dentry *eeprom;
+ struct dentry *drm;
};
static int wiidebug_eeprom_open(struct inode *i, struct file *f)
@@ -86,10 +88,97 @@ static const struct file_operations wiidebug_eeprom_fops = {
.llseek = generic_file_llseek,
};
+static const char *wiidebug_drmmap[] = {
+ [WIIPROTO_REQ_NULL] = "NULL",
+ [WIIPROTO_REQ_DRM_K] = "K",
+ [WIIPROTO_REQ_DRM_KA] = "KA",
+ [WIIPROTO_REQ_DRM_KE] = "KE",
+ [WIIPROTO_REQ_DRM_KAI] = "KAI",
+ [WIIPROTO_REQ_DRM_KEE] = "KEE",
+ [WIIPROTO_REQ_DRM_KAE] = "KAE",
+ [WIIPROTO_REQ_DRM_KIE] = "KIE",
+ [WIIPROTO_REQ_DRM_KAIE] = "KAIE",
+ [WIIPROTO_REQ_DRM_E] = "E",
+ [WIIPROTO_REQ_DRM_SKAI1] = "SKAI1",
+ [WIIPROTO_REQ_DRM_SKAI2] = "SKAI2",
+ [WIIPROTO_REQ_MAX] = NULL
+};
+
+static int wiidebug_drm_show(struct seq_file *f, void *p)
+{
+ struct wiimote_debug *dbg = f->private;
+ const char *str = NULL;
+ unsigned long flags;
+ __u8 drm;
+
+ spin_lock_irqsave(&dbg->wdata->state.lock, flags);
+ drm = dbg->wdata->state.drm;
+ spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
+
+ if (drm < WIIPROTO_REQ_MAX)
+ str = wiidebug_drmmap[drm];
+ if (!str)
+ str = "unknown";
+
+ seq_printf(f, "%s\n", str);
+
+ return 0;
+}
+
+static int wiidebug_drm_open(struct inode *i, struct file *f)
+{
+ return single_open(f, wiidebug_drm_show, i->i_private);
+}
+
+static ssize_t wiidebug_drm_write(struct file *f, const char __user *u,
+ size_t s, loff_t *off)
+{
+ struct wiimote_debug *dbg = f->private_data;
+ unsigned long flags;
+ char buf[16];
+ ssize_t len;
+ int i;
+
+ if (s == 0)
+ return -EINVAL;
+
+ len = min((size_t) 15, s);
+ if (copy_from_user(buf, u, len))
+ return -EFAULT;
+
+ buf[15] = 0;
+
+ for (i = 0; i < WIIPROTO_REQ_MAX; ++i) {
+ if (!wiidebug_drmmap[i])
+ continue;
+ if (!strcasecmp(buf, wiidebug_drmmap[i]))
+ break;
+ }
+
+ if (i == WIIPROTO_REQ_MAX)
+ i = simple_strtoul(buf, NULL, 10);
+
+ spin_lock_irqsave(&dbg->wdata->state.lock, flags);
+ wiiproto_req_drm(dbg->wdata, (__u8) i);
+ spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
+
+ return len;
+}
+
+static const struct file_operations wiidebug_drm_fops = {
+ .owner = THIS_MODULE,
+ .open = wiidebug_drm_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = wiidebug_drm_write,
+ .release = single_release,
+};
+
int wiidebug_init(struct wiimote_data *wdata)
{
struct wiimote_debug *dbg;
unsigned long flags;
+ int ret = -ENOMEM;
dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
if (!dbg)
@@ -99,16 +188,25 @@ int wiidebug_init(struct wiimote_data *wdata)
dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
- if (!dbg->eeprom) {
- kfree(dbg);
- return -ENOMEM;
- }
+ if (!dbg->eeprom)
+ goto err;
+
+ dbg->drm = debugfs_create_file("drm", S_IRUSR,
+ dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
+ if (!dbg->drm)
+ goto err_drm;
spin_lock_irqsave(&wdata->state.lock, flags);
wdata->debug = dbg;
spin_unlock_irqrestore(&wdata->state.lock, flags);
return 0;
+
+err_drm:
+ debugfs_remove(dbg->eeprom);
+err:
+ kfree(dbg);
+ return ret;
}
void wiidebug_deinit(struct wiimote_data *wdata)
@@ -123,6 +221,7 @@ void wiidebug_deinit(struct wiimote_data *wdata)
wdata->debug = NULL;
spin_unlock_irqrestore(&wdata->state.lock, flags);
+ debugfs_remove(dbg->drm);
debugfs_remove(dbg->eeprom);
kfree(dbg);
}