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authorDavid Herrmann <dh.herrmann@googlemail.com>2011-11-17 14:12:11 +0100
committerJiri Kosina <jkosina@suse.cz>2011-11-22 23:10:58 +0100
commit1d3452c63d4b62329d34d7634f67a3dbec21ca87 (patch)
tree5538195cda1a066e83aa5bee1da479fed004281b
parent43e5e7c60ee7039f538ccfaaa4e99829719d9bea (diff)
HID: wiimote: Allow direct eeprom access
The wiimote provides direct access to parts of its eeprom. This implements read support for small chunks of the eeprom. This isn't very fast but prevents the reader from blocking the wiimote stream for too long. Write support is not yet supported as the wiimote breaks if we overwrite its memory. Use hidraw to reverse-engineer the eeprom before implementing write support here. Signed-off-by: David Herrmann <dh.herrmann@googlemail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
-rw-r--r--drivers/hid/hid-wiimote-core.c10
-rw-r--r--drivers/hid/hid-wiimote-debug.c76
-rw-r--r--drivers/hid/hid-wiimote.h7
3 files changed, 85 insertions, 8 deletions
diff --git a/drivers/hid/hid-wiimote-core.c b/drivers/hid/hid-wiimote-core.c
index 919abbaba840..2fd2f0337b8d 100644
--- a/drivers/hid/hid-wiimote-core.c
+++ b/drivers/hid/hid-wiimote-core.c
@@ -320,14 +320,8 @@ static void wiiproto_req_wmem(struct wiimote_data *wdata, bool eeprom,
wiimote_queue(wdata, cmd, sizeof(cmd));
}
-#define wiiproto_req_rreg(wdata, os, sz) \
- wiiproto_req_rmem((wdata), false, (os), (sz))
-
-#define wiiproto_req_reeprom(wdata, os, sz) \
- wiiproto_req_rmem((wdata), true, (os), (sz))
-
-static void wiiproto_req_rmem(struct wiimote_data *wdata, bool eeprom,
- __u32 offset, __u16 size)
+void wiiproto_req_rmem(struct wiimote_data *wdata, bool eeprom, __u32 offset,
+ __u16 size)
{
__u8 cmd[7];
diff --git a/drivers/hid/hid-wiimote-debug.c b/drivers/hid/hid-wiimote-debug.c
index 6282e3c1a362..f81243c86790 100644
--- a/drivers/hid/hid-wiimote-debug.c
+++ b/drivers/hid/hid-wiimote-debug.c
@@ -10,12 +10,80 @@
* any later version.
*/
+#include <linux/debugfs.h>
#include <linux/module.h>
#include <linux/spinlock.h>
+#include <linux/uaccess.h>
#include "hid-wiimote.h"
struct wiimote_debug {
struct wiimote_data *wdata;
+ struct dentry *eeprom;
+};
+
+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,
};
int wiidebug_init(struct wiimote_data *wdata)
@@ -29,6 +97,13 @@ int wiidebug_init(struct wiimote_data *wdata)
dbg->wdata = 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;
+ }
+
spin_lock_irqsave(&wdata->state.lock, flags);
wdata->debug = dbg;
spin_unlock_irqrestore(&wdata->state.lock, flags);
@@ -48,5 +123,6 @@ void wiidebug_deinit(struct wiimote_data *wdata)
wdata->debug = NULL;
spin_unlock_irqrestore(&wdata->state.lock, flags);
+ debugfs_remove(dbg->eeprom);
kfree(dbg);
}
diff --git a/drivers/hid/hid-wiimote.h b/drivers/hid/hid-wiimote.h
index 89b8851dbf1f..7b6765797f81 100644
--- a/drivers/hid/hid-wiimote.h
+++ b/drivers/hid/hid-wiimote.h
@@ -120,6 +120,13 @@ extern int wiimote_cmd_write(struct wiimote_data *wdata, __u32 offset,
extern ssize_t wiimote_cmd_read(struct wiimote_data *wdata, __u32 offset,
__u8 *rmem, __u8 size);
+#define wiiproto_req_rreg(wdata, os, sz) \
+ wiiproto_req_rmem((wdata), false, (os), (sz))
+#define wiiproto_req_reeprom(wdata, os, sz) \
+ wiiproto_req_rmem((wdata), true, (os), (sz))
+extern void wiiproto_req_rmem(struct wiimote_data *wdata, bool eeprom,
+ __u32 offset, __u16 size);
+
#ifdef CONFIG_HID_WIIMOTE_EXT
extern int wiiext_init(struct wiimote_data *wdata);