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Commit 43d782ae authored by David Herrmann's avatar David Herrmann Committed by Jiri Kosina
Browse files

HID: wiimote: Allow direct DRM debug access 



Keep track of current drm and add new debugfs file which reads or writes the
current DRM.

Signed-off-by: default avatarDavid Herrmann <dh.herrmann@googlemail.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 1d3452c6

drivers/hid/hid-wiimote-core.c

+2 −0
Original line number Diff line number Diff line
@@ -238,6 +238,7 @@ void wiiproto_req_drm(struct wiimote_data *wdata, __u8 drm) 
	cmd[1] = 0;

	cmd[2] = drm;



	wdata->state.drm = drm;

	wiiproto_keep_rumble(wdata, &cmd[1]);

	wiimote_queue(wdata, cmd, sizeof(cmd));

}
@@ -1141,6 +1142,7 @@ static struct wiimote_data *wiimote_create(struct hid_device *hdev) 
	spin_lock_init(&wdata->state.lock);

	init_completion(&wdata->state.ready);

	mutex_init(&wdata->state.sync);

	wdata->state.drm = WIIPROTO_REQ_DRM_K;



	return wdata;

drivers/hid/hid-wiimote-debug.c

+103 −4
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 


#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"
@@ -19,6 +20,7 @@ 
struct wiimote_debug {

	struct wiimote_data *wdata;

	struct dentry *eeprom;

	struct dentry *drm;

};



static int wiidebug_eeprom_open(struct inode *i, struct file *f)
@@ -86,10 +88,97 @@ static const struct file_operations wiidebug_eeprom_fops = { 
	.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 wiimote_debug *dbg = f->private_data;

	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[15] = 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, 10);



	spin_lock_irqsave(&dbg->wdata->state.lock, flags);

	wiiproto_req_drm(dbg->wdata, (__u8) i);

	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)
@@ -99,16 +188,25 @@ int wiidebug_init(struct wiimote_data *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;

	}

	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)
@@ -123,6 +221,7 @@ void wiidebug_deinit(struct wiimote_data *wdata) 
	wdata->debug = NULL;

	spin_unlock_irqrestore(&wdata->state.lock, flags);



	debugfs_remove(dbg->drm);

	debugfs_remove(dbg->eeprom);

	kfree(dbg);

}

drivers/hid/hid-wiimote.h

+2 −0
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ struct wiimote_state { 
	spinlock_t lock;

	__u8 flags;

	__u8 accel_split[2];

	__u8 drm;



	/* synchronous cmd requests */

	struct mutex sync;
@@ -109,6 +110,7 @@ enum wiiproto_reqs { 
	WIIPROTO_REQ_DRM_E = 0x3d,

	WIIPROTO_REQ_DRM_SKAI1 = 0x3e,

	WIIPROTO_REQ_DRM_SKAI2 = 0x3f,

	WIIPROTO_REQ_MAX

};



#define dev_to_wii(pdev) hid_get_drvdata(container_of(pdev, struct hid_device, \