diff options
Diffstat (limited to 'drivers/hid/hid-wiimote-debug.c')
| -rw-r--r-- | drivers/hid/hid-wiimote-debug.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/drivers/hid/hid-wiimote-debug.c b/drivers/hid/hid-wiimote-debug.c index 6282e3c1a36..f81243c8679 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); } |