[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / macintosh / mac_hid.c

/*
 * drivers/macintosh/mac_hid.c
 *
 * HID support stuff for Macintosh computers.
 *
 * Copyright (C) 2000 Franz Sirl.
 *
 * This file will soon be removed in favor of an uinput userspace tool.
 */

#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/sysctl.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/slab.h>

MODULE_LICENSE("GPL");

static int mouse_emulate_buttons;
static int mouse_button2_keycode = KEY_RIGHTCTRL;	/* right control key */
static int mouse_button3_keycode = KEY_RIGHTALT;	/* right option key */

static struct input_dev *mac_hid_emumouse_dev;

static DEFINE_MUTEX(mac_hid_emumouse_mutex);

static int mac_hid_create_emumouse(void)
{
	static struct lock_class_key mac_hid_emumouse_dev_event_class;
	static struct lock_class_key mac_hid_emumouse_dev_mutex_class;
	int err;

	mac_hid_emumouse_dev = input_allocate_device();
	if (!mac_hid_emumouse_dev)
		return -ENOMEM;

	lockdep_set_class(&mac_hid_emumouse_dev->event_lock,
			  &mac_hid_emumouse_dev_event_class);
	lockdep_set_class(&mac_hid_emumouse_dev->mutex,
			  &mac_hid_emumouse_dev_mutex_class);

	mac_hid_emumouse_dev->name = "Macintosh mouse button emulation";
	mac_hid_emumouse_dev->id.bustype = BUS_ADB;
	mac_hid_emumouse_dev->id.vendor = 0x0001;
	mac_hid_emumouse_dev->id.product = 0x0001;
	mac_hid_emumouse_dev->id.version = 0x0100;

	mac_hid_emumouse_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
	mac_hid_emumouse_dev->keybit[BIT_WORD(BTN_MOUSE)] =
		BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
	mac_hid_emumouse_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);

	err = input_register_device(mac_hid_emumouse_dev);
	if (err) {
		input_free_device(mac_hid_emumouse_dev);
		mac_hid_emumouse_dev = NULL;
		return err;
	}

	return 0;
}

static void mac_hid_destroy_emumouse(void)
{
	input_unregister_device(mac_hid_emumouse_dev);
	mac_hid_emumouse_dev = NULL;
}

static bool mac_hid_emumouse_filter(struct input_handle *handle,
				    unsigned int type, unsigned int code,
				    int value)
{
	unsigned int btn;

	if (type != EV_KEY)
		return false;

	if (code == mouse_button2_keycode)
		btn = BTN_MIDDLE;
	else if (code == mouse_button3_keycode)
		btn = BTN_RIGHT;
	else
		return false;

	input_report_key(mac_hid_emumouse_dev, btn, value);
	input_sync(mac_hid_emumouse_dev);

	return true;
}

static int mac_hid_emumouse_connect(struct input_handler *handler,
				    struct input_dev *dev,
				    const struct input_device_id *id)
{
	struct input_handle *handle;
	int error;

	/* Don't bind to ourselves */
	if (dev == mac_hid_emumouse_dev)
		return -ENODEV;

	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
	if (!handle)
		return -ENOMEM;

	handle->dev = dev;
	handle->handler = handler;
	handle->name = "mac-button-emul";

	error = input_register_handle(handle);
	if (error) {
		printk(KERN_ERR
			"mac_hid: Failed to register button emulation handle, "
			"error %d\n", error);
		goto err_free;
	}

	error = input_open_device(handle);
	if (error) {
		printk(KERN_ERR
			"mac_hid: Failed to open input device, error %d\n",
			error);
		goto err_unregister;
	}

	return 0;

 err_unregister:
	input_unregister_handle(handle);
 err_free:
	kfree(handle);
	return error;
}

static void mac_hid_emumouse_disconnect(struct input_handle *handle)
{
	input_close_device(handle);
	input_unregister_handle(handle);
	kfree(handle);
}

static const struct input_device_id mac_hid_emumouse_ids[] = {
	{
		.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
		.evbit = { BIT_MASK(EV_KEY) },
	},
	{ },
};

MODULE_DEVICE_TABLE(input, mac_hid_emumouse_ids);

static struct input_handler mac_hid_emumouse_handler = {
	.filter		= mac_hid_emumouse_filter,
	.connect	= mac_hid_emumouse_connect,
	.disconnect	= mac_hid_emumouse_disconnect,
	.name		= "mac-button-emul",
	.id_table	= mac_hid_emumouse_ids,
};

static int mac_hid_start_emulation(void)
{
	int err;

	err = mac_hid_create_emumouse();
	if (err)
		return err;

	err = input_register_handler(&mac_hid_emumouse_handler);
	if (err) {
		mac_hid_destroy_emumouse();
		return err;
	}

	return 0;
}

static void mac_hid_stop_emulation(void)
{
	input_unregister_handler(&mac_hid_emumouse_handler);
	mac_hid_destroy_emumouse();
}

static int mac_hid_toggle_emumouse(ctl_table *table, int write,
				   void __user *buffer, size_t *lenp,
				   loff_t *ppos)
{
	int *valp = table->data;
	int old_val = *valp;
	int rc;

	rc = mutex_lock_killable(&mac_hid_emumouse_mutex);
	if (rc)
		return rc;

	rc = proc_dointvec(table, write, buffer, lenp, ppos);

	if (rc == 0 && write && *valp != old_val) {
		if (*valp == 1)
			rc = mac_hid_start_emulation();
		else if (*valp == 0)
			mac_hid_stop_emulation();
		else
			rc = -EINVAL;
	}

	/* Restore the old value in case of error */
	if (rc)
		*valp = old_val;

	mutex_unlock(&mac_hid_emumouse_mutex);

	return rc;
}

/* file(s) in /proc/sys/dev/mac_hid */
static ctl_table mac_hid_files[] = {
	{
		.procname	= "mouse_button_emulation",
		.data		= &mouse_emulate_buttons,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= mac_hid_toggle_emumouse,
	},
	{
		.procname	= "mouse_button2_keycode",
		.data		= &mouse_button2_keycode,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{
		.procname	= "mouse_button3_keycode",
		.data		= &mouse_button3_keycode,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{ }
};

/* dir in /proc/sys/dev */
static ctl_table mac_hid_dir[] = {
	{
		.procname	= "mac_hid",
		.maxlen		= 0,
		.mode		= 0555,
		.child		= mac_hid_files,
	},
	{ }
};

/* /proc/sys/dev itself, in case that is not there yet */
static ctl_table mac_hid_root_dir[] = {
	{
		.procname	= "dev",
		.maxlen		= 0,
		.mode		= 0555,
		.child		= mac_hid_dir,
	},
	{ }
};

static struct ctl_table_header *mac_hid_sysctl_header;

static int __init mac_hid_init(void)
{
	mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir);
	if (!mac_hid_sysctl_header)
		return -ENOMEM;

	return 0;
}
module_init(mac_hid_init);

static void __exit mac_hid_exit(void)
{
	unregister_sysctl_table(mac_hid_sysctl_header);

	if (mouse_emulate_buttons)
		mac_hid_stop_emulation();
}
module_exit(mac_hid_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* drivers/macintosh/mac_hid.c
	3	*
	4	* HID support stuff for Macintosh computers.
	5	*
	6	* Copyright (C) 2000 Franz Sirl.
	7	*
	8	* This file will soon be removed in favor of an uinput userspace tool.
	9	*/
	10
1da177e4 LT	11	#include <linux/init.h>
	12	#include <linux/proc_fs.h>
	13	#include <linux/sysctl.h>
	14	#include <linux/input.h>
	15	#include <linux/module.h>
5a0e3ad6	16	#include <linux/slab.h>
1da177e4	17
429722e1 DT	18	MODULE_LICENSE("GPL");
429722e1 DT	19
87275856	20	static int mouse_emulate_buttons;
1da177e4 LT	21	static int mouse_button2_keycode = KEY_RIGHTCTRL; /* right control key */
1da177e4 LT	22	static int mouse_button3_keycode = KEY_RIGHTALT; /* right option key */
1da177e4	23
99b089c3 DT	24	static struct input_dev *mac_hid_emumouse_dev;
99b089c3 DT	25
87abb6bb DT	26	static DEFINE_MUTEX(mac_hid_emumouse_mutex);
87abb6bb DT	27
99b089c3 DT	28	static int mac_hid_create_emumouse(void)
	29	{
	30	static struct lock_class_key mac_hid_emumouse_dev_event_class;
	31	static struct lock_class_key mac_hid_emumouse_dev_mutex_class;
	32	int err;
	33
	34	mac_hid_emumouse_dev = input_allocate_device();
	35	if (!mac_hid_emumouse_dev)
	36	return -ENOMEM;
	37
	38	lockdep_set_class(&mac_hid_emumouse_dev->event_lock,
	39	&mac_hid_emumouse_dev_event_class);
	40	lockdep_set_class(&mac_hid_emumouse_dev->mutex,
	41	&mac_hid_emumouse_dev_mutex_class);
	42
	43	mac_hid_emumouse_dev->name = "Macintosh mouse button emulation";
	44	mac_hid_emumouse_dev->id.bustype = BUS_ADB;
	45	mac_hid_emumouse_dev->id.vendor = 0x0001;
	46	mac_hid_emumouse_dev->id.product = 0x0001;
	47	mac_hid_emumouse_dev->id.version = 0x0100;
	48
	49	mac_hid_emumouse_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_REL);
	50	mac_hid_emumouse_dev->keybit[BIT_WORD(BTN_MOUSE)] =
	51	BIT_MASK(BTN_LEFT) \| BIT_MASK(BTN_MIDDLE) \| BIT_MASK(BTN_RIGHT);
	52	mac_hid_emumouse_dev->relbit[0] = BIT_MASK(REL_X) \| BIT_MASK(REL_Y);
	53
	54	err = input_register_device(mac_hid_emumouse_dev);
	55	if (err) {
	56	input_free_device(mac_hid_emumouse_dev);
	57	mac_hid_emumouse_dev = NULL;
	58	return err;
	59	}
	60
	61	return 0;
	62	}
	63
	64	static void mac_hid_destroy_emumouse(void)
	65	{
	66	input_unregister_device(mac_hid_emumouse_dev);
	67	mac_hid_emumouse_dev = NULL;
	68	}
	69
	70	static bool mac_hid_emumouse_filter(struct input_handle *handle,
	71	unsigned int type, unsigned int code,
	72	int value)
	73	{
	74	unsigned int btn;
	75
	76	if (type != EV_KEY)
	77	return false;
	78
	79	if (code == mouse_button2_keycode)
	80	btn = BTN_MIDDLE;
	81	else if (code == mouse_button3_keycode)
	82	btn = BTN_RIGHT;
	83	else
	84	return false;
	85
	86	input_report_key(mac_hid_emumouse_dev, btn, value);
	87	input_sync(mac_hid_emumouse_dev);
	88
	89	return true;
	90	}
	91
92	static int mac_hid_emumouse_connect(struct input_handler *handler,
93	struct input_dev *dev,
94	const struct input_device_id *id)
95	{
96	struct input_handle *handle;
97	int error;
98
99	/* Don't bind to ourselves */
100	if (dev == mac_hid_emumouse_dev)
101	return -ENODEV;
102
103	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
104	if (!handle)
105	return -ENOMEM;
106
107	handle->dev = dev;
108	handle->handler = handler;
109	handle->name = "mac-button-emul";
110
111	error = input_register_handle(handle);
112	if (error) {
113	printk(KERN_ERR
114	"mac_hid: Failed to register button emulation handle, "
115	"error %d\n", error);
116	goto err_free;
117	}
118
119	error = input_open_device(handle);
120	if (error) {
121	printk(KERN_ERR
122	"mac_hid: Failed to open input device, error %d\n",
123	error);
124	goto err_unregister;
125	}
126
127	return 0;
128
129	err_unregister:
130	input_unregister_handle(handle);
131	err_free:
132	kfree(handle);
133	return error;
134	}
135
136	static void mac_hid_emumouse_disconnect(struct input_handle *handle)
137	{
138	input_close_device(handle);
139	input_unregister_handle(handle);
140	kfree(handle);
141	}
142
143	static const struct input_device_id mac_hid_emumouse_ids[] = {
144	{
145	.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
146	.evbit = { BIT_MASK(EV_KEY) },
147	},
148	{ },
149	};
150
151	MODULE_DEVICE_TABLE(input, mac_hid_emumouse_ids);
152
153	static struct input_handler mac_hid_emumouse_handler = {
154	.filter = mac_hid_emumouse_filter,
155	.connect = mac_hid_emumouse_connect,
156	.disconnect = mac_hid_emumouse_disconnect,
157	.name = "mac-button-emul",
158	.id_table = mac_hid_emumouse_ids,
159	};
160
161	static int mac_hid_start_emulation(void)
162	{
163	int err;
164
165	err = mac_hid_create_emumouse();
166	if (err)
167	return err;
168
169	err = input_register_handler(&mac_hid_emumouse_handler);
170	if (err) {
171	mac_hid_destroy_emumouse();
172	return err;
173	}
174
175	return 0;
176	}
177
178	static void mac_hid_stop_emulation(void)
179	{
180	input_unregister_handler(&mac_hid_emumouse_handler);
181	mac_hid_destroy_emumouse();
182	}
183
184	static int mac_hid_toggle_emumouse(ctl_table *table, int write,
185	void __user buffer, size_t lenp,
186	loff_t *ppos)
187	{
188	int *valp = table->data;
189	int old_val = *valp;
190	int rc;
191
87abb6bb DT	192	rc = mutex_lock_killable(&mac_hid_emumouse_mutex);
	193	if (rc)
	194	return rc;
	195
99b089c3 DT	196	rc = proc_dointvec(table, write, buffer, lenp, ppos);
	197
	198	if (rc == 0 && write && *valp != old_val) {
	199	if (*valp == 1)
	200	rc = mac_hid_start_emulation();
	201	else if (*valp == 0)
	202	mac_hid_stop_emulation();
	203	else
	204	rc = -EINVAL;
	205	}
	206
	207	/* Restore the old value in case of error */
	208	if (rc)
	209	*valp = old_val;
	210
87abb6bb DT	211	mutex_unlock(&mac_hid_emumouse_mutex);
87abb6bb DT	212
99b089c3 DT	213	return rc;
	214	}
	215
1da177e4	216	/* file(s) in /proc/sys/dev/mac_hid */
f3e5d2bf	217	static ctl_table mac_hid_files[] = {
1da177e4	218	{
1da177e4 LT	219	.procname = "mouse_button_emulation",
	220	.data = &mouse_emulate_buttons,
	221	.maxlen = sizeof(int),
	222	.mode = 0644,
99b089c3	223	.proc_handler = mac_hid_toggle_emumouse,
1da177e4 LT	224	},
1da177e4 LT	225	{
1da177e4 LT	226	.procname = "mouse_button2_keycode",
	227	.data = &mouse_button2_keycode,
	228	.maxlen = sizeof(int),
	229	.mode = 0644,
6d456111	230	.proc_handler = proc_dointvec,
1da177e4 LT	231	},
1da177e4 LT	232	{
1da177e4 LT	233	.procname = "mouse_button3_keycode",
	234	.data = &mouse_button3_keycode,
	235	.maxlen = sizeof(int),
	236	.mode = 0644,
6d456111	237	.proc_handler = proc_dointvec,
1da177e4	238	},
894d2491	239	{ }
1da177e4 LT	240	};
	241
	242	/* dir in /proc/sys/dev */
f3e5d2bf	243	static ctl_table mac_hid_dir[] = {
1da177e4	244	{
1da177e4 LT	245	.procname = "mac_hid",
	246	.maxlen = 0,
	247	.mode = 0555,
	248	.child = mac_hid_files,
	249	},
894d2491	250	{ }
1da177e4 LT	251	};
	252
	253	/* /proc/sys/dev itself, in case that is not there yet */
f3e5d2bf	254	static ctl_table mac_hid_root_dir[] = {
1da177e4	255	{
1da177e4 LT	256	.procname = "dev",
	257	.maxlen = 0,
	258	.mode = 0555,
	259	.child = mac_hid_dir,
	260	},
894d2491	261	{ }
1da177e4 LT	262	};
	263
	264	static struct ctl_table_header *mac_hid_sysctl_header;
	265
f3e5d2bf	266	static int __init mac_hid_init(void)
1da177e4	267	{
0b4d4147	268	mac_hid_sysctl_header = register_sysctl_table(mac_hid_root_dir);
99b089c3 DT	269	if (!mac_hid_sysctl_header)
99b089c3 DT	270	return -ENOMEM;
1da177e4 LT	271
	272	return 0;
	273	}
429722e1	274	module_init(mac_hid_init);
1da177e4	275
429722e1 DT	276	static void __exit mac_hid_exit(void)
	277	{
	278	unregister_sysctl_table(mac_hid_sysctl_header);
	279
	280	if (mouse_emulate_buttons)
	281	mac_hid_stop_emulation();
	282	}
	283	module_exit(mac_hid_exit);