[mirror_ubuntu-zesty-kernel.git] / drivers / input / misc / ideapad_slidebar.c

/*
 * Input driver for slidebars on some Lenovo IdeaPad laptops
 *
 * Copyright (C) 2013 Andrey Moiseev <o2g.org.ru@gmail.com>
 *
 * Reverse-engineered from Lenovo SlideNav software (SBarHook.dll).
 *
 * 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.
 *
 * Trademarks are the property of their respective owners.
 */

/*
 * Currently tested and works on:
 *	Lenovo IdeaPad Y550
 *	Lenovo IdeaPad Y550P
 *
 * Other models can be added easily. To test,
 * load with 'force' parameter set 'true'.
 *
 * LEDs blinking and input mode are managed via sysfs,
 * (hex, unsigned byte value):
 * /sys/devices/platform/ideapad_slidebar/slidebar_mode
 *
 * The value is in byte range, however, I only figured out
 * how bits 0b10011001 work. Some other bits, probably,
 * are meaningfull too.
 *
 * Possible states:
 *
 * STD_INT, ONMOV_INT, OFF_INT, LAST_POLL, OFF_POLL
 *
 * Meaning:
 *           released      touched
 * STD       'heartbeat'   lights follow the finger
 * ONMOV     no lights     lights follow the finger
 * LAST      at last pos   lights follow the finger
 * OFF       no lights     no lights
 *
 * INT       all input events are generated, interrupts are used
 * POLL      no input events by default, to get them,
 *	     send 0b10000000 (read below)
 *
 * Commands: write
 *
 * All      |  0b01001 -> STD_INT
 * possible |  0b10001 -> ONMOV_INT
 * states   |  0b01000 -> OFF_INT
 *
 *                      |  0b0 -> LAST_POLL
 * STD_INT or ONMOV_INT |
 *                      |  0b1 -> STD_INT
 *
 *                      |  0b0 -> OFF_POLL
 * OFF_INT or OFF_POLL  |
 *                      |  0b1 -> OFF_INT
 *
 * Any state |   0b10000000 ->  if the slidebar has updated data,
 *				produce one input event (last position),
 *				switch to respective POLL mode
 *				(like 0x0), if not in POLL mode yet.
 *
 * Get current state: read
 *
 * masked by 0x11 read value means:
 *
 * 0x00   LAST
 * 0x01   STD
 * 0x10   OFF
 * 0x11   ONMOV
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/dmi.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/i8042.h>
#include <linux/serio.h>

#define IDEAPAD_BASE	0xff29

static bool force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");

static DEFINE_SPINLOCK(io_lock);

static struct input_dev *slidebar_input_dev;
static struct platform_device *slidebar_platform_dev;

static u8 slidebar_pos_get(void)
{
	u8 res;
	unsigned long flags;

	spin_lock_irqsave(&io_lock, flags);
	outb(0xf4, 0xff29);
	outb(0xbf, 0xff2a);
	res = inb(0xff2b);
	spin_unlock_irqrestore(&io_lock, flags);

	return res;
}

static u8 slidebar_mode_get(void)
{
	u8 res;
	unsigned long flags;

	spin_lock_irqsave(&io_lock, flags);
	outb(0xf7, 0xff29);
	outb(0x8b, 0xff2a);
	res = inb(0xff2b);
	spin_unlock_irqrestore(&io_lock, flags);

	return res;
}

static void slidebar_mode_set(u8 mode)
{
	unsigned long flags;

	spin_lock_irqsave(&io_lock, flags);
	outb(0xf7, 0xff29);
	outb(0x8b, 0xff2a);
	outb(mode, 0xff2b);
	spin_unlock_irqrestore(&io_lock, flags);
}

static bool slidebar_i8042_filter(unsigned char data, unsigned char str,
				  struct serio *port)
{
	static bool extended = false;

	/* We are only interested in data coming form KBC port */
	if (str & I8042_STR_AUXDATA)
		return false;

	/* Scancodes: e03b on move, e0bb on release. */
	if (data == 0xe0) {
		extended = true;
		return true;
	}

	if (!extended)
		return false;

	extended = false;

	if (likely((data & 0x7f) != 0x3b)) {
		serio_interrupt(port, 0xe0, 0);
		return false;
	}

	if (data & 0x80) {
		input_report_key(slidebar_input_dev, BTN_TOUCH, 0);
	} else {
		input_report_key(slidebar_input_dev, BTN_TOUCH, 1);
		input_report_abs(slidebar_input_dev, ABS_X, slidebar_pos_get());
	}
	input_sync(slidebar_input_dev);

	return true;
}

static ssize_t show_slidebar_mode(struct device *dev,
				  struct device_attribute *attr,
				  char *buf)
{
	return sprintf(buf, "%x\n", slidebar_mode_get());
}

static ssize_t store_slidebar_mode(struct device *dev,
				   struct device_attribute *attr,
				   const char *buf, size_t count)
{
	u8 mode;
	int error;

	error = kstrtou8(buf, 0, &mode);
	if (error)
		return error;

	slidebar_mode_set(mode);

	return count;
}

static DEVICE_ATTR(slidebar_mode, S_IWUSR | S_IRUGO,
		   show_slidebar_mode, store_slidebar_mode);

static struct attribute *ideapad_attrs[] = {
	&dev_attr_slidebar_mode.attr,
	NULL
};

static struct attribute_group ideapad_attr_group = {
	.attrs = ideapad_attrs
};

static const struct attribute_group *ideapad_attr_groups[] = {
	&ideapad_attr_group,
	NULL
};

static int __init ideapad_probe(struct platform_device* pdev)
{
	int err;

	if (!request_region(IDEAPAD_BASE, 3, "ideapad_slidebar")) {
		dev_err(&pdev->dev, "IO ports are busy\n");
		return -EBUSY;
	}

	slidebar_input_dev = input_allocate_device();
	if (!slidebar_input_dev) {
		dev_err(&pdev->dev, "Failed to allocate input device\n");
		err = -ENOMEM;
		goto err_release_ports;
	}

	slidebar_input_dev->name = "IdeaPad Slidebar";
	slidebar_input_dev->id.bustype = BUS_HOST;
	slidebar_input_dev->dev.parent = &pdev->dev;
	input_set_capability(slidebar_input_dev, EV_KEY, BTN_TOUCH);
	input_set_capability(slidebar_input_dev, EV_ABS, ABS_X);
	input_set_abs_params(slidebar_input_dev, ABS_X, 0, 0xff, 0, 0);

	err = i8042_install_filter(slidebar_i8042_filter);
	if (err) {
		dev_err(&pdev->dev,
			"Failed to install i8042 filter: %d\n", err);
		goto err_free_dev;
	}

	err = input_register_device(slidebar_input_dev);
	if (err) {
		dev_err(&pdev->dev,
			"Failed to register input device: %d\n", err);
		goto err_remove_filter;
	}

	return 0;

err_remove_filter:
	i8042_remove_filter(slidebar_i8042_filter);
err_free_dev:
	input_free_device(slidebar_input_dev);
err_release_ports:
	release_region(IDEAPAD_BASE, 3);
	return err;
}

static int ideapad_remove(struct platform_device *pdev)
{
	i8042_remove_filter(slidebar_i8042_filter);
	input_unregister_device(slidebar_input_dev);
	release_region(IDEAPAD_BASE, 3);

	return 0;
}

static struct platform_driver slidebar_drv = {
	.driver = {
		.name = "ideapad_slidebar",
	},
	.remove = ideapad_remove,
};

static int __init ideapad_dmi_check(const struct dmi_system_id *id)
{
	pr_info("Laptop model '%s'\n", id->ident);
	return 1;
}

static const struct dmi_system_id ideapad_dmi[] __initconst = {
	{
		.ident = "Lenovo IdeaPad Y550",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
			DMI_MATCH(DMI_PRODUCT_NAME, "20017"),
			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Y550")
		},
		.callback = ideapad_dmi_check
	},
	{
		.ident = "Lenovo IdeaPad Y550P",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
			DMI_MATCH(DMI_PRODUCT_NAME, "20035"),
			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Y550P")
		},
		.callback = ideapad_dmi_check
	},
	{ NULL, }
};
MODULE_DEVICE_TABLE(dmi, ideapad_dmi);

static int __init slidebar_init(void)
{
	int err;

	if (!force && !dmi_check_system(ideapad_dmi)) {
		pr_err("DMI does not match\n");
		return -ENODEV;
	}

	slidebar_platform_dev = platform_device_alloc("ideapad_slidebar", -1);
	if (!slidebar_platform_dev) {
		pr_err("Not enough memory\n");
		return -ENOMEM;
	}

	slidebar_platform_dev->dev.groups = ideapad_attr_groups;

	err = platform_device_add(slidebar_platform_dev);
	if (err) {
		pr_err("Failed to register platform device\n");
		goto err_free_dev;
	}

	err = platform_driver_probe(&slidebar_drv, ideapad_probe);
	if (err) {
		pr_err("Failed to register platform driver\n");
		goto err_delete_dev;
	}

	return 0;

err_delete_dev:
	platform_device_del(slidebar_platform_dev);
err_free_dev:
	platform_device_put(slidebar_platform_dev);
	return err;
}

static void __exit slidebar_exit(void)
{
	platform_device_unregister(slidebar_platform_dev);
	platform_driver_unregister(&slidebar_drv);
}

module_init(slidebar_init);
module_exit(slidebar_exit);

MODULE_AUTHOR("Andrey Moiseev <o2g.org.ru@gmail.com>");
MODULE_DESCRIPTION("Slidebar input support for some Lenovo IdeaPad laptops");
MODULE_LICENSE("GPL");
Commit	Line	Data
1ea4c161 AM	1	/*
	2	* Input driver for slidebars on some Lenovo IdeaPad laptops
	3	*
	4	* Copyright (C) 2013 Andrey Moiseev <o2g.org.ru@gmail.com>
	5	*
	6	* Reverse-engineered from Lenovo SlideNav software (SBarHook.dll).
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the Free
	10	* Software Foundation; either version 2 of the License, or (at your option)
	11	* any later version.
	12	*
	13	* Trademarks are the property of their respective owners.
	14	*/
	15
	16	/*
	17	* Currently tested and works on:
	18	* Lenovo IdeaPad Y550
	19	* Lenovo IdeaPad Y550P
	20	*
	21	* Other models can be added easily. To test,
	22	* load with 'force' parameter set 'true'.
	23	*
	24	* LEDs blinking and input mode are managed via sysfs,
	25	* (hex, unsigned byte value):
	26	* /sys/devices/platform/ideapad_slidebar/slidebar_mode
	27	*
	28	* The value is in byte range, however, I only figured out
	29	* how bits 0b10011001 work. Some other bits, probably,
	30	* are meaningfull too.
	31	*
	32	* Possible states:
	33	*
	34	* STD_INT, ONMOV_INT, OFF_INT, LAST_POLL, OFF_POLL
	35	*
	36	* Meaning:
	37	* released touched
	38	* STD 'heartbeat' lights follow the finger
	39	* ONMOV no lights lights follow the finger
	40	* LAST at last pos lights follow the finger
	41	* OFF no lights no lights
	42	*
	43	* INT all input events are generated, interrupts are used
	44	* POLL no input events by default, to get them,
	45	* send 0b10000000 (read below)
	46	*
	47	* Commands: write
	48	*
	49	* All \| 0b01001 -> STD_INT
	50	* possible \| 0b10001 -> ONMOV_INT
	51	* states \| 0b01000 -> OFF_INT
	52	*
	53	* \| 0b0 -> LAST_POLL
	54	* STD_INT or ONMOV_INT \|
	55	* \| 0b1 -> STD_INT
	56	*
	57	* \| 0b0 -> OFF_POLL
	58	* OFF_INT or OFF_POLL \|
	59	* \| 0b1 -> OFF_INT
	60	*
	61	* Any state \| 0b10000000 -> if the slidebar has updated data,
	62	* produce one input event (last position),
	63	* switch to respective POLL mode
	64	* (like 0x0), if not in POLL mode yet.
65	*
66	* Get current state: read
67	*
68	* masked by 0x11 read value means:
69	*
70	* 0x00 LAST
71	* 0x01 STD
72	* 0x10 OFF
73	* 0x11 ONMOV
74	*/
75
76	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
77
78	#include <linux/module.h>
79	#include <linux/kernel.h>
80	#include <linux/dmi.h>
81	#include <linux/spinlock.h>
82	#include <linux/platform_device.h>
83	#include <linux/input.h>
84	#include <linux/io.h>
85	#include <linux/ioport.h>
86	#include <linux/i8042.h>
87	#include <linux/serio.h>
88
89	#define IDEAPAD_BASE 0xff29
90
91	static bool force;
92	module_param(force, bool, 0);
93	MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
94
95	static DEFINE_SPINLOCK(io_lock);
96
97	static struct input_dev *slidebar_input_dev;
98	static struct platform_device *slidebar_platform_dev;
99
100	static u8 slidebar_pos_get(void)
101	{
102	u8 res;
103	unsigned long flags;
104
105	spin_lock_irqsave(&io_lock, flags);
106	outb(0xf4, 0xff29);
107	outb(0xbf, 0xff2a);
108	res = inb(0xff2b);
109	spin_unlock_irqrestore(&io_lock, flags);
110
111	return res;
112	}
113
114	static u8 slidebar_mode_get(void)
115	{
116	u8 res;
117	unsigned long flags;
118
119	spin_lock_irqsave(&io_lock, flags);
120	outb(0xf7, 0xff29);
121	outb(0x8b, 0xff2a);
122	res = inb(0xff2b);
123	spin_unlock_irqrestore(&io_lock, flags);
124
125	return res;
126	}
127
128	static void slidebar_mode_set(u8 mode)
129	{
130	unsigned long flags;
131
132	spin_lock_irqsave(&io_lock, flags);
133	outb(0xf7, 0xff29);
134	outb(0x8b, 0xff2a);
135	outb(mode, 0xff2b);
136	spin_unlock_irqrestore(&io_lock, flags);
137	}
138
139	static bool slidebar_i8042_filter(unsigned char data, unsigned char str,
140	struct serio *port)
141	{
142	static bool extended = false;
143
144	/* We are only interested in data coming form KBC port */
145	if (str & I8042_STR_AUXDATA)
146	return false;
147
148	/* Scancodes: e03b on move, e0bb on release. */
149	if (data == 0xe0) {
150	extended = true;
151	return true;
152	}
153
154	if (!extended)
155	return false;
156
157	extended = false;
158
159	if (likely((data & 0x7f) != 0x3b)) {
160	serio_interrupt(port, 0xe0, 0);
161	return false;
162	}
163
164	if (data & 0x80) {
165	input_report_key(slidebar_input_dev, BTN_TOUCH, 0);
166	} else {
167	input_report_key(slidebar_input_dev, BTN_TOUCH, 1);
168	input_report_abs(slidebar_input_dev, ABS_X, slidebar_pos_get());
169	}
170	input_sync(slidebar_input_dev);
171
172	return true;
173	}
174
175	static ssize_t show_slidebar_mode(struct device *dev,
176	struct device_attribute *attr,
177	char *buf)
178	{
179	return sprintf(buf, "%x\n", slidebar_mode_get());
180	}
181
182	static ssize_t store_slidebar_mode(struct device *dev,
183	struct device_attribute *attr,
184	const char *buf, size_t count)
185	{
186	u8 mode;
187	int error;
188
189	error = kstrtou8(buf, 0, &mode);
190	if (error)
191	return error;
192
193	slidebar_mode_set(mode);
194
195	return count;
196	}
197
198	static DEVICE_ATTR(slidebar_mode, S_IWUSR \| S_IRUGO,
199	show_slidebar_mode, store_slidebar_mode);
200
201	static struct attribute *ideapad_attrs[] = {
202	&dev_attr_slidebar_mode.attr,
203	NULL
204	};
205
206	static struct attribute_group ideapad_attr_group = {
207	.attrs = ideapad_attrs
208	};
209
210	static const struct attribute_group *ideapad_attr_groups[] = {
211	&ideapad_attr_group,
212	NULL
213	};
214
215	static int __init ideapad_probe(struct platform_device* pdev)
216	{
217	int err;
218
219	if (!request_region(IDEAPAD_BASE, 3, "ideapad_slidebar")) {
220	dev_err(&pdev->dev, "IO ports are busy\n");
221	return -EBUSY;
222	}
223
224	slidebar_input_dev = input_allocate_device();
225	if (!slidebar_input_dev) {
226	dev_err(&pdev->dev, "Failed to allocate input device\n");
227	err = -ENOMEM;
228	goto err_release_ports;
229	}
230
231	slidebar_input_dev->name = "IdeaPad Slidebar";
232	slidebar_input_dev->id.bustype = BUS_HOST;
233	slidebar_input_dev->dev.parent = &pdev->dev;
234	input_set_capability(slidebar_input_dev, EV_KEY, BTN_TOUCH);
235	input_set_capability(slidebar_input_dev, EV_ABS, ABS_X);
236	input_set_abs_params(slidebar_input_dev, ABS_X, 0, 0xff, 0, 0);
237
238	err = i8042_install_filter(slidebar_i8042_filter);
239	if (err) {
240	dev_err(&pdev->dev,
241	"Failed to install i8042 filter: %d\n", err);
242	goto err_free_dev;
243	}
244
245	err = input_register_device(slidebar_input_dev);
246	if (err) {
247	dev_err(&pdev->dev,
248	"Failed to register input device: %d\n", err);
249	goto err_remove_filter;
250	}
251
252	return 0;
253
254	err_remove_filter:
255	i8042_remove_filter(slidebar_i8042_filter);
256	err_free_dev:
257	input_free_device(slidebar_input_dev);
258	err_release_ports:
259	release_region(IDEAPAD_BASE, 3);
260	return err;
261	}
262
263	static int ideapad_remove(struct platform_device *pdev)
264	{
265	i8042_remove_filter(slidebar_i8042_filter);
266	input_unregister_device(slidebar_input_dev);
267	release_region(IDEAPAD_BASE, 3);
268
269	return 0;
270	}
271
272	static struct platform_driver slidebar_drv = {
273	.driver = {
274	.name = "ideapad_slidebar",
1ea4c161 AM	275	},
	276	.remove = ideapad_remove,
	277	};
	278
	279	static int __init ideapad_dmi_check(const struct dmi_system_id *id)
	280	{
	281	pr_info("Laptop model '%s'\n", id->ident);
	282	return 1;
	283	}
	284
	285	static const struct dmi_system_id ideapad_dmi[] __initconst = {
	286	{
	287	.ident = "Lenovo IdeaPad Y550",
	288	.matches = {
	289	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	290	DMI_MATCH(DMI_PRODUCT_NAME, "20017"),
	291	DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Y550")
	292	},
	293	.callback = ideapad_dmi_check
	294	},
	295	{
	296	.ident = "Lenovo IdeaPad Y550P",
	297	.matches = {
	298	DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
	299	DMI_MATCH(DMI_PRODUCT_NAME, "20035"),
	300	DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Y550P")
	301	},
	302	.callback = ideapad_dmi_check
	303	},
	304	{ NULL, }
	305	};
	306	MODULE_DEVICE_TABLE(dmi, ideapad_dmi);
	307
	308	static int __init slidebar_init(void)
	309	{
	310	int err;
	311
	312	if (!force && !dmi_check_system(ideapad_dmi)) {
	313	pr_err("DMI does not match\n");
	314	return -ENODEV;
	315	}
	316
	317	slidebar_platform_dev = platform_device_alloc("ideapad_slidebar", -1);
	318	if (!slidebar_platform_dev) {
	319	pr_err("Not enough memory\n");
	320	return -ENOMEM;
	321	}
	322
	323	slidebar_platform_dev->dev.groups = ideapad_attr_groups;
	324
	325	err = platform_device_add(slidebar_platform_dev);
	326	if (err) {
	327	pr_err("Failed to register platform device\n");
	328	goto err_free_dev;
	329	}
	330
	331	err = platform_driver_probe(&slidebar_drv, ideapad_probe);
	332	if (err) {
	333	pr_err("Failed to register platform driver\n");
	334	goto err_delete_dev;
	335	}
	336
	337	return 0;
	338
339	err_delete_dev:
340	platform_device_del(slidebar_platform_dev);
341	err_free_dev:
342	platform_device_put(slidebar_platform_dev);
343	return err;
344	}
345
346	static void __exit slidebar_exit(void)
347	{
348	platform_device_unregister(slidebar_platform_dev);
349	platform_driver_unregister(&slidebar_drv);
350	}
351
352	module_init(slidebar_init);
353	module_exit(slidebar_exit);
354
355	MODULE_AUTHOR("Andrey Moiseev <o2g.org.ru@gmail.com>");
356	MODULE_DESCRIPTION("Slidebar input support for some Lenovo IdeaPad laptops");
357	MODULE_LICENSE("GPL");