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Linux/drivers/input/misc/ideapad_slidebar.c

  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",
275                 .owner = THIS_MODULE,
276         },
277         .remove = ideapad_remove,
278 };
279 
280 static int __init ideapad_dmi_check(const struct dmi_system_id *id)
281 {
282         pr_info("Laptop model '%s'\n", id->ident);
283         return 1;
284 }
285 
286 static const struct dmi_system_id ideapad_dmi[] __initconst = {
287         {
288                 .ident = "Lenovo IdeaPad Y550",
289                 .matches = {
290                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
291                         DMI_MATCH(DMI_PRODUCT_NAME, "20017"),
292                         DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Y550")
293                 },
294                 .callback = ideapad_dmi_check
295         },
296         {
297                 .ident = "Lenovo IdeaPad Y550P",
298                 .matches = {
299                         DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
300                         DMI_MATCH(DMI_PRODUCT_NAME, "20035"),
301                         DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo IdeaPad Y550P")
302                 },
303                 .callback = ideapad_dmi_check
304         },
305         { NULL, }
306 };
307 MODULE_DEVICE_TABLE(dmi, ideapad_dmi);
308 
309 static int __init slidebar_init(void)
310 {
311         int err;
312 
313         if (!force && !dmi_check_system(ideapad_dmi)) {
314                 pr_err("DMI does not match\n");
315                 return -ENODEV;
316         }
317 
318         slidebar_platform_dev = platform_device_alloc("ideapad_slidebar", -1);
319         if (!slidebar_platform_dev) {
320                 pr_err("Not enough memory\n");
321                 return -ENOMEM;
322         }
323 
324         slidebar_platform_dev->dev.groups = ideapad_attr_groups;
325 
326         err = platform_device_add(slidebar_platform_dev);
327         if (err) {
328                 pr_err("Failed to register platform device\n");
329                 goto err_free_dev;
330         }
331 
332         err = platform_driver_probe(&slidebar_drv, ideapad_probe);
333         if (err) {
334                 pr_err("Failed to register platform driver\n");
335                 goto err_delete_dev;
336         }
337 
338         return 0;
339 
340 err_delete_dev:
341         platform_device_del(slidebar_platform_dev);
342 err_free_dev:
343         platform_device_put(slidebar_platform_dev);
344         return err;
345 }
346 
347 static void __exit slidebar_exit(void)
348 {
349         platform_device_unregister(slidebar_platform_dev);
350         platform_driver_unregister(&slidebar_drv);
351 }
352 
353 module_init(slidebar_init);
354 module_exit(slidebar_exit);
355 
356 MODULE_AUTHOR("Andrey Moiseev <o2g.org.ru@gmail.com>");
357 MODULE_DESCRIPTION("Slidebar input support for some Lenovo IdeaPad laptops");
358 MODULE_LICENSE("GPL");
359 

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