1 files changed, 227 insertions, 0 deletions

diff --git a/drivers/hid/hid-wiimote-debug.c b/drivers/hid/hid-wiimote-debug.c
new file mode 100644
index 000000000000..17dabc1f339e
--- /dev/null
+++ b/drivers/hid/hid-wiimote-debug.c
@@ -0,0 +1,227 @@
+/*
+ * Debug support for HID Nintendo Wiimote devices
+ * Copyright (c) 2011 David Herrmann
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#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"
+
+struct wiimote_debug {
+        struct wiimote_data *wdata;
+        struct dentry *eeprom;
+        struct dentry *drm;
+};
+
+static int wiidebug_eeprom_open(struct inode *i, struct file *f)
+{
+        f->private_data = i->i_private;
+        return 0;
+}
+
+static ssize_t wiidebug_eeprom_read(struct file *f, char __user *u, size_t s,
+                                                                loff_t *off)
+{
+        struct wiimote_debug *dbg = f->private_data;
+        struct wiimote_data *wdata = dbg->wdata;
+        unsigned long flags;
+        ssize_t ret;
+        char buf[16];
+        __u16 size;
+
+        if (s == 0)
+                return -EINVAL;
+        if (*off > 0xffffff)
+                return 0;
+        if (s > 16)
+                s = 16;
+
+        ret = wiimote_cmd_acquire(wdata);
+        if (ret)
+                return ret;
+
+        spin_lock_irqsave(&wdata->state.lock, flags);
+        wdata->state.cmd_read_size = s;
+        wdata->state.cmd_read_buf = buf;
+        wiimote_cmd_set(wdata, WIIPROTO_REQ_RMEM, *off & 0xffff);
+        wiiproto_req_reeprom(wdata, *off, s);
+        spin_unlock_irqrestore(&wdata->state.lock, flags);
+
+        ret = wiimote_cmd_wait(wdata);
+        if (!ret)
+                size = wdata->state.cmd_read_size;
+
+        spin_lock_irqsave(&wdata->state.lock, flags);
+        wdata->state.cmd_read_buf = NULL;
+        spin_unlock_irqrestore(&wdata->state.lock, flags);
+
+        wiimote_cmd_release(wdata);
+
+        if (ret)
+                return ret;
+        else if (size == 0)
+                return -EIO;
+
+        if (copy_to_user(u, buf, size))
+                return -EFAULT;
+
+        *off += size;
+        ret = size;
+
+        return ret;
+}
+
+static const struct file_operations wiidebug_eeprom_fops = {
+        .owner = THIS_MODULE,
+        .open = wiidebug_eeprom_open,
+        .read = wiidebug_eeprom_read,
+        .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)
+                return -ENOMEM;
+
+        dbg->wdata = wdata;
+
+        dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
+                dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
+        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)
+{
+        struct wiimote_debug *dbg = wdata->debug;
+        unsigned long flags;
+
+        if (!dbg)
+                return;
+
+        spin_lock_irqsave(&wdata->state.lock, flags);
+        wdata->debug = NULL;
+        spin_unlock_irqrestore(&wdata->state.lock, flags);
+
+        debugfs_remove(dbg->drm);
+        debugfs_remove(dbg->eeprom);
+        kfree(dbg);
+}