[mirror_ubuntu-artful-kernel.git] / drivers / hid / hid-wiimote-debug.c

/*
 * Debug support for HID Nintendo Wii / Wii U peripherals
 * Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
 */

/*
 * 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 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 = 0;

	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 = simple_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 seq_file *sf = f->private_data;
	struct wiimote_debug *dbg = sf->private;
	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[len] = 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, 16);

	spin_lock_irqsave(&dbg->wdata->state.lock, flags);
	dbg->wdata->state.flags &= ~WIIPROTO_FLAG_DRM_LOCKED;
	wiiproto_req_drm(dbg->wdata, (__u8) i);
	if (i != WIIPROTO_REQ_NULL)
		dbg->wdata->state.flags |= WIIPROTO_FLAG_DRM_LOCKED;
	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);
}
Commit	Line	Data
43e5e7c6	1	/*
92eda7e4 DH	2	* Debug support for HID Nintendo Wii / Wii U peripherals
92eda7e4 DH	3	* Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
43e5e7c6 DH	4	*/
	5
	6	/*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the Free
	9	* Software Foundation; either version 2 of the License, or (at your option)
	10	* any later version.
	11	*/
	12
1d3452c6	13	#include <linux/debugfs.h>
43e5e7c6	14	#include <linux/module.h>
43d782ae	15	#include <linux/seq_file.h>
43e5e7c6	16	#include <linux/spinlock.h>
1d3452c6	17	#include <linux/uaccess.h>
43e5e7c6 DH	18	#include "hid-wiimote.h"
	19
	20	struct wiimote_debug {
	21	struct wiimote_data *wdata;
1d3452c6	22	struct dentry *eeprom;
43d782ae	23	struct dentry *drm;
1d3452c6 DH	24	};
1d3452c6 DH	25
1d3452c6 DH	26	static ssize_t wiidebug_eeprom_read(struct file f, char __user u, size_t s,
	27	loff_t *off)
	28	{
	29	struct wiimote_debug *dbg = f->private_data;
	30	struct wiimote_data *wdata = dbg->wdata;
	31	unsigned long flags;
	32	ssize_t ret;
	33	char buf[16];
b77a989a	34	__u16 size = 0;
1d3452c6 DH	35
	36	if (s == 0)
	37	return -EINVAL;
	38	if (*off > 0xffffff)
	39	return 0;
	40	if (s > 16)
	41	s = 16;
	42
	43	ret = wiimote_cmd_acquire(wdata);
	44	if (ret)
	45	return ret;
	46
	47	spin_lock_irqsave(&wdata->state.lock, flags);
	48	wdata->state.cmd_read_size = s;
	49	wdata->state.cmd_read_buf = buf;
	50	wiimote_cmd_set(wdata, WIIPROTO_REQ_RMEM, *off & 0xffff);
	51	wiiproto_req_reeprom(wdata, *off, s);
	52	spin_unlock_irqrestore(&wdata->state.lock, flags);
	53
	54	ret = wiimote_cmd_wait(wdata);
	55	if (!ret)
	56	size = wdata->state.cmd_read_size;
	57
	58	spin_lock_irqsave(&wdata->state.lock, flags);
	59	wdata->state.cmd_read_buf = NULL;
	60	spin_unlock_irqrestore(&wdata->state.lock, flags);
	61
	62	wiimote_cmd_release(wdata);
	63
	64	if (ret)
	65	return ret;
	66	else if (size == 0)
	67	return -EIO;
	68
	69	if (copy_to_user(u, buf, size))
	70	return -EFAULT;
	71
	72	*off += size;
	73	ret = size;
	74
	75	return ret;
	76	}
	77
	78	static const struct file_operations wiidebug_eeprom_fops = {
	79	.owner = THIS_MODULE,
234e3405	80	.open = simple_open,
1d3452c6 DH	81	.read = wiidebug_eeprom_read,
1d3452c6 DH	82	.llseek = generic_file_llseek,
43e5e7c6 DH	83	};
43e5e7c6 DH	84
43d782ae DH	85	static const char *wiidebug_drmmap[] = {
	86	[WIIPROTO_REQ_NULL] = "NULL",
	87	[WIIPROTO_REQ_DRM_K] = "K",
	88	[WIIPROTO_REQ_DRM_KA] = "KA",
	89	[WIIPROTO_REQ_DRM_KE] = "KE",
	90	[WIIPROTO_REQ_DRM_KAI] = "KAI",
	91	[WIIPROTO_REQ_DRM_KEE] = "KEE",
	92	[WIIPROTO_REQ_DRM_KAE] = "KAE",
	93	[WIIPROTO_REQ_DRM_KIE] = "KIE",
	94	[WIIPROTO_REQ_DRM_KAIE] = "KAIE",
	95	[WIIPROTO_REQ_DRM_E] = "E",
	96	[WIIPROTO_REQ_DRM_SKAI1] = "SKAI1",
	97	[WIIPROTO_REQ_DRM_SKAI2] = "SKAI2",
	98	[WIIPROTO_REQ_MAX] = NULL
	99	};
	100
	101	static int wiidebug_drm_show(struct seq_file f, void p)
	102	{
	103	struct wiimote_debug *dbg = f->private;
	104	const char *str = NULL;
	105	unsigned long flags;
	106	__u8 drm;
	107
	108	spin_lock_irqsave(&dbg->wdata->state.lock, flags);
	109	drm = dbg->wdata->state.drm;
	110	spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
	111
	112	if (drm < WIIPROTO_REQ_MAX)
	113	str = wiidebug_drmmap[drm];
	114	if (!str)
	115	str = "unknown";
	116
	117	seq_printf(f, "%s\n", str);
	118
	119	return 0;
	120	}
	121
	122	static int wiidebug_drm_open(struct inode i, struct file f)
	123	{
	124	return single_open(f, wiidebug_drm_show, i->i_private);
	125	}
	126
	127	static ssize_t wiidebug_drm_write(struct file f, const char __user u,
	128	size_t s, loff_t *off)
	129	{
51103c70 DH	130	struct seq_file *sf = f->private_data;
51103c70 DH	131	struct wiimote_debug *dbg = sf->private;
43d782ae DH	132	unsigned long flags;
	133	char buf[16];
	134	ssize_t len;
	135	int i;
	136
	137	if (s == 0)
	138	return -EINVAL;
	139
	140	len = min((size_t) 15, s);
	141	if (copy_from_user(buf, u, len))
	142	return -EFAULT;
	143
0d57eb87	144	buf[len] = 0;
43d782ae DH	145
	146	for (i = 0; i < WIIPROTO_REQ_MAX; ++i) {
	147	if (!wiidebug_drmmap[i])
	148	continue;
	149	if (!strcasecmp(buf, wiidebug_drmmap[i]))
	150	break;
	151	}
	152
	153	if (i == WIIPROTO_REQ_MAX)
0d57eb87	154	i = simple_strtoul(buf, NULL, 16);
43d782ae DH	155
43d782ae DH	156	spin_lock_irqsave(&dbg->wdata->state.lock, flags);
d76f89e1	157	dbg->wdata->state.flags &= ~WIIPROTO_FLAG_DRM_LOCKED;
43d782ae	158	wiiproto_req_drm(dbg->wdata, (__u8) i);
d76f89e1 DH	159	if (i != WIIPROTO_REQ_NULL)
d76f89e1 DH	160	dbg->wdata->state.flags \|= WIIPROTO_FLAG_DRM_LOCKED;
43d782ae DH	161	spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
	162
	163	return len;
	164	}
	165
	166	static const struct file_operations wiidebug_drm_fops = {
	167	.owner = THIS_MODULE,
	168	.open = wiidebug_drm_open,
	169	.read = seq_read,
	170	.llseek = seq_lseek,
	171	.write = wiidebug_drm_write,
	172	.release = single_release,
	173	};
	174
43e5e7c6 DH	175	int wiidebug_init(struct wiimote_data *wdata)
	176	{
	177	struct wiimote_debug *dbg;
	178	unsigned long flags;
43d782ae	179	int ret = -ENOMEM;
43e5e7c6 DH	180
	181	dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
	182	if (!dbg)
	183	return -ENOMEM;
	184
	185	dbg->wdata = wdata;
	186
1d3452c6 DH	187	dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
1d3452c6 DH	188	dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
43d782ae DH	189	if (!dbg->eeprom)
	190	goto err;
	191
	192	dbg->drm = debugfs_create_file("drm", S_IRUSR,
	193	dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
	194	if (!dbg->drm)
	195	goto err_drm;
1d3452c6	196
43e5e7c6 DH	197	spin_lock_irqsave(&wdata->state.lock, flags);
	198	wdata->debug = dbg;
	199	spin_unlock_irqrestore(&wdata->state.lock, flags);
	200
	201	return 0;
43d782ae DH	202
	203	err_drm:
	204	debugfs_remove(dbg->eeprom);
	205	err:
	206	kfree(dbg);
	207	return ret;
43e5e7c6 DH	208	}
	209
	210	void wiidebug_deinit(struct wiimote_data *wdata)
	211	{
	212	struct wiimote_debug *dbg = wdata->debug;
	213	unsigned long flags;
	214
	215	if (!dbg)
	216	return;
	217
	218	spin_lock_irqsave(&wdata->state.lock, flags);
	219	wdata->debug = NULL;
	220	spin_unlock_irqrestore(&wdata->state.lock, flags);
	221
43d782ae	222	debugfs_remove(dbg->drm);
1d3452c6	223	debugfs_remove(dbg->eeprom);
43e5e7c6 DH	224	kfree(dbg);
43e5e7c6 DH	225	}