[linux-2.6-block.git] / drivers / hid / hid-wiimote-debug.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Debug support for HID Nintendo Wii / Wii U peripherals
 * Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
 */

/*
 */

#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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
43e5e7c6	2	/*
92eda7e4 DH	3	* Debug support for HID Nintendo Wii / Wii U peripherals
92eda7e4 DH	4	* Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
43e5e7c6 DH	5	*/
	6
	7	/*
43e5e7c6 DH	8	*/
43e5e7c6 DH	9
1d3452c6	10	#include <linux/debugfs.h>
43e5e7c6	11	#include <linux/module.h>
43d782ae	12	#include <linux/seq_file.h>
43e5e7c6	13	#include <linux/spinlock.h>
1d3452c6	14	#include <linux/uaccess.h>
43e5e7c6 DH	15	#include "hid-wiimote.h"
	16
	17	struct wiimote_debug {
	18	struct wiimote_data *wdata;
1d3452c6	19	struct dentry *eeprom;
43d782ae	20	struct dentry *drm;
1d3452c6 DH	21	};
1d3452c6 DH	22
1d3452c6 DH	23	static ssize_t wiidebug_eeprom_read(struct file f, char __user u, size_t s,
	24	loff_t *off)
	25	{
	26	struct wiimote_debug *dbg = f->private_data;
	27	struct wiimote_data *wdata = dbg->wdata;
	28	unsigned long flags;
	29	ssize_t ret;
	30	char buf[16];
b77a989a	31	__u16 size = 0;
1d3452c6 DH	32
	33	if (s == 0)
	34	return -EINVAL;
	35	if (*off > 0xffffff)
	36	return 0;
	37	if (s > 16)
	38	s = 16;
	39
	40	ret = wiimote_cmd_acquire(wdata);
	41	if (ret)
	42	return ret;
	43
	44	spin_lock_irqsave(&wdata->state.lock, flags);
	45	wdata->state.cmd_read_size = s;
	46	wdata->state.cmd_read_buf = buf;
	47	wiimote_cmd_set(wdata, WIIPROTO_REQ_RMEM, *off & 0xffff);
	48	wiiproto_req_reeprom(wdata, *off, s);
	49	spin_unlock_irqrestore(&wdata->state.lock, flags);
	50
	51	ret = wiimote_cmd_wait(wdata);
	52	if (!ret)
	53	size = wdata->state.cmd_read_size;
	54
	55	spin_lock_irqsave(&wdata->state.lock, flags);
	56	wdata->state.cmd_read_buf = NULL;
	57	spin_unlock_irqrestore(&wdata->state.lock, flags);
	58
	59	wiimote_cmd_release(wdata);
	60
	61	if (ret)
	62	return ret;
	63	else if (size == 0)
	64	return -EIO;
	65
	66	if (copy_to_user(u, buf, size))
	67	return -EFAULT;
	68
	69	*off += size;
	70	ret = size;
	71
	72	return ret;
	73	}
	74
	75	static const struct file_operations wiidebug_eeprom_fops = {
	76	.owner = THIS_MODULE,
234e3405	77	.open = simple_open,
1d3452c6 DH	78	.read = wiidebug_eeprom_read,
1d3452c6 DH	79	.llseek = generic_file_llseek,
43e5e7c6 DH	80	};
43e5e7c6 DH	81
43d782ae DH	82	static const char *wiidebug_drmmap[] = {
	83	[WIIPROTO_REQ_NULL] = "NULL",
	84	[WIIPROTO_REQ_DRM_K] = "K",
	85	[WIIPROTO_REQ_DRM_KA] = "KA",
	86	[WIIPROTO_REQ_DRM_KE] = "KE",
	87	[WIIPROTO_REQ_DRM_KAI] = "KAI",
	88	[WIIPROTO_REQ_DRM_KEE] = "KEE",
	89	[WIIPROTO_REQ_DRM_KAE] = "KAE",
	90	[WIIPROTO_REQ_DRM_KIE] = "KIE",
	91	[WIIPROTO_REQ_DRM_KAIE] = "KAIE",
	92	[WIIPROTO_REQ_DRM_E] = "E",
	93	[WIIPROTO_REQ_DRM_SKAI1] = "SKAI1",
	94	[WIIPROTO_REQ_DRM_SKAI2] = "SKAI2",
	95	[WIIPROTO_REQ_MAX] = NULL
	96	};
	97
	98	static int wiidebug_drm_show(struct seq_file f, void p)
	99	{
	100	struct wiimote_debug *dbg = f->private;
	101	const char *str = NULL;
	102	unsigned long flags;
	103	__u8 drm;
	104
	105	spin_lock_irqsave(&dbg->wdata->state.lock, flags);
	106	drm = dbg->wdata->state.drm;
	107	spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
	108
	109	if (drm < WIIPROTO_REQ_MAX)
	110	str = wiidebug_drmmap[drm];
	111	if (!str)
	112	str = "unknown";
	113
	114	seq_printf(f, "%s\n", str);
	115
	116	return 0;
	117	}
	118
	119	static int wiidebug_drm_open(struct inode i, struct file f)
	120	{
	121	return single_open(f, wiidebug_drm_show, i->i_private);
	122	}
	123
	124	static ssize_t wiidebug_drm_write(struct file f, const char __user u,
	125	size_t s, loff_t *off)
	126	{
51103c70 DH	127	struct seq_file *sf = f->private_data;
51103c70 DH	128	struct wiimote_debug *dbg = sf->private;
43d782ae DH	129	unsigned long flags;
	130	char buf[16];
	131	ssize_t len;
	132	int i;
	133
	134	if (s == 0)
	135	return -EINVAL;
	136
	137	len = min((size_t) 15, s);
	138	if (copy_from_user(buf, u, len))
	139	return -EFAULT;
	140
0d57eb87	141	buf[len] = 0;
43d782ae DH	142
	143	for (i = 0; i < WIIPROTO_REQ_MAX; ++i) {
	144	if (!wiidebug_drmmap[i])
	145	continue;
	146	if (!strcasecmp(buf, wiidebug_drmmap[i]))
	147	break;
	148	}
	149
	150	if (i == WIIPROTO_REQ_MAX)
0d57eb87	151	i = simple_strtoul(buf, NULL, 16);
43d782ae DH	152
43d782ae DH	153	spin_lock_irqsave(&dbg->wdata->state.lock, flags);
d76f89e1	154	dbg->wdata->state.flags &= ~WIIPROTO_FLAG_DRM_LOCKED;
43d782ae	155	wiiproto_req_drm(dbg->wdata, (__u8) i);
d76f89e1 DH	156	if (i != WIIPROTO_REQ_NULL)
d76f89e1 DH	157	dbg->wdata->state.flags \|= WIIPROTO_FLAG_DRM_LOCKED;
43d782ae DH	158	spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
	159
	160	return len;
	161	}
	162
	163	static const struct file_operations wiidebug_drm_fops = {
	164	.owner = THIS_MODULE,
	165	.open = wiidebug_drm_open,
	166	.read = seq_read,
	167	.llseek = seq_lseek,
	168	.write = wiidebug_drm_write,
	169	.release = single_release,
	170	};
	171
43e5e7c6 DH	172	int wiidebug_init(struct wiimote_data *wdata)
	173	{
	174	struct wiimote_debug *dbg;
	175	unsigned long flags;
43d782ae	176	int ret = -ENOMEM;
43e5e7c6 DH	177
	178	dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
	179	if (!dbg)
	180	return -ENOMEM;
	181
	182	dbg->wdata = wdata;
	183
1d3452c6 DH	184	dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
1d3452c6 DH	185	dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
43d782ae DH	186	if (!dbg->eeprom)
	187	goto err;
	188
	189	dbg->drm = debugfs_create_file("drm", S_IRUSR,
	190	dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
	191	if (!dbg->drm)
	192	goto err_drm;
1d3452c6	193
43e5e7c6 DH	194	spin_lock_irqsave(&wdata->state.lock, flags);
	195	wdata->debug = dbg;
	196	spin_unlock_irqrestore(&wdata->state.lock, flags);
	197
	198	return 0;
43d782ae DH	199
	200	err_drm:
	201	debugfs_remove(dbg->eeprom);
	202	err:
	203	kfree(dbg);
	204	return ret;
43e5e7c6 DH	205	}
	206
	207	void wiidebug_deinit(struct wiimote_data *wdata)
	208	{
	209	struct wiimote_debug *dbg = wdata->debug;
	210	unsigned long flags;
	211
	212	if (!dbg)
	213	return;
	214
	215	spin_lock_irqsave(&wdata->state.lock, flags);
	216	wdata->debug = NULL;
	217	spin_unlock_irqrestore(&wdata->state.lock, flags);
	218
43d782ae	219	debugfs_remove(dbg->drm);
1d3452c6	220	debugfs_remove(dbg->eeprom);
43e5e7c6 DH	221	kfree(dbg);
43e5e7c6 DH	222	}