path: root/drivers/hid/hid-picolcd_debugfs.c

/***************************************************************************
 *   Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org>  *
 *                                                                         *
 *   Based on Logitech G13 driver (v0.4)                                   *
 *     Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu>   *
 *                                                                         *
 *   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, version 2 of the License.               *
 *                                                                         *
 *   This driver is distributed in the hope that it will be useful, but    *
 *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      *
 *   General Public License for more details.                              *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this software. If not see <http://www.gnu.org/licenses/>.  *
 ***************************************************************************/

#include <linux/hid.h>
#include <linux/hid-debug.h>

#include <linux/fb.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>

#include <linux/module.h>
#include <linux/uaccess.h>

#include "hid-picolcd.h"


static int picolcd_debug_reset_show(struct seq_file *f, void *p)
{
	if (picolcd_fbinfo((struct picolcd_data *)f->private))
		seq_printf(f, "all fb\n");
	else
		seq_printf(f, "all\n");
	return 0;
}

static int picolcd_debug_reset_open(struct inode *inode, struct file *f)
{
	return single_open(f, picolcd_debug_reset_show, inode->i_private);
}

static ssize_t picolcd_debug_reset_write(struct file *f, const char __user *user_buf,
		size_t count, loff_t *ppos)
{
	struct picolcd_data *data = ((struct seq_file *)f->private_data)->private;
	char buf[32];
	size_t cnt = min(count, sizeof(buf)-1);
	if (copy_from_user(buf, user_buf, cnt))
		return -EFAULT;

	while (cnt > 0 && (buf[cnt-1] == ' ' || buf[cnt-1] == '\n'))
		cnt--;
	buf[cnt] = '\0';
	if (strcmp(buf, "all") == 0) {
		picolcd_reset(data->hdev);
		picolcd_fb_reset(data, 1);
	} else if (strcmp(buf, "fb") == 0) {
		picolcd_fb_reset(data, 1);
	} else {
		return -EINVAL;
	}
	return count;
}

static const struct file_operations picolcd_debug_reset_fops = {
	.owner    = THIS_MODULE,
	.open     = picolcd_debug_reset_open,
	.read     = seq_read,
	.llseek   = seq_lseek,
	.write    = picolcd_debug_reset_write,
	.release  = single_release,
};

/*
 * The "eeprom" file
 */
static ssize_t picolcd_debug_eeprom_read(struct file *f, char __user *u,
		size_t s, loff_t *off)
{
	struct picolcd_data *data = f->private_data;
	struct picolcd_pending *resp;
	u8 raw_data[3];
	ssize_t ret = -EIO;

	if (s == 0)
		return -EINVAL;
	if (*off > 0x0ff)
		return 0;

	/* prepare buffer with info about what we want to read (addr & len) */
	raw_data[0] = *off & 0xff;
	raw_data[1] = (*off >> 8) & 0xff;
	raw_data[2] = s < 20 ? s : 20;
	if (*off + raw_data[2] > 0xff)
		raw_data[2] = 0x100 - *off;
	resp = picolcd_send_and_wait(data->hdev, REPORT_EE_READ, raw_data,
			sizeof(raw_data));
	if (!resp)
		return -EIO;

	if (resp->in_report && resp->in_report->id == REPORT_EE_DATA) {
		/* successful read :) */
		ret = resp->raw_data[2];
		if (ret > s)
			ret = s;
		if (copy_to_user(u, resp->raw_data+3, ret))
			ret = -EFAULT;
		else
			*off += ret;
	} /* anything else is some kind of IO error */

	kfree(resp);
	return ret;
}

static ssize_t picolcd_debug_eeprom_write(struct file *f, const char __user *u,
		size_t s, loff_t *off)
{
	struct picolcd_data *data = f->private_data;
	struct picolcd_pending *resp;
	ssize_t ret = -EIO;
	u8 raw_data[23];

	if (s == 0)
		return -EINVAL;
	if (*off > 0x0ff)
		return -ENOSPC;

	memset(raw_data, 0, sizeof(raw_data));
	raw_data[0] = *off & 0xff;
	raw_data[1] = (*off >> 8) & 0xff;
	raw_data[2] = min_t(size_t, 20, s);
	if