summaryrefslogtreecommitdiff
path: root/drivers/hwmon/lis3lv02d.c
blob: 752b5c44df9c3ebb10cfc73e6df00b7d1641fb45 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
/*
 *  lis3lv02d.c - ST LIS3LV02DL accelerometer driver
 *
 *  Copyright (C) 2007-2008 Yan Burman
 *  Copyright (C) 2008 Eric Piel
 *
 *  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.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/kthread.h>
#include <linux/semaphore.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/poll.h>
#include <linux/freezer.h>
#include <linux/version.h>
#include <linux/uaccess.h>
#include <acpi/acpi_drivers.h>
#include <asm/atomic.h>
#include "lis3lv02d.h"

#define DRIVER_NAME     "lis3lv02d"
#define ACPI_MDPS_CLASS "accelerometer"

/* joystick device poll interval in milliseconds */
#define MDPS_POLL_INTERVAL 50
/*
 * The sensor can also generate interrupts (DRDY) but it's pretty pointless
 * because their are generated even if the data do not change. So it's better
 * to keep the interrupt for the free-fall event. The values are updated at
 * 40Hz (at the lowest frequency), but as it can be pretty time consuming on
 * some low processor, we poll the sensor only at 20Hz... enough for the
 * joystick.
 */

/* Maximum value our axis may get for the input device (signed 12 bits) */
#define MDPS_MAX_VAL 2048

struct axis_conversion {
	s8	x;
	s8	y;
	s8	z;
};

struct acpi_lis3lv02d {
	struct acpi_device	*device;   /* The ACPI device */
	struct input_dev	*idev;     /* input device */
	struct task_struct	*kthread;  /* kthread for input */
	struct mutex            lock;
	struct platform_device	*pdev;     /* platform device */
	atomic_t		count;     /* interrupt count after last read */
	int			xcalib;    /* calibrated null value for x */
	int			ycalib;    /* calibrated null value for y */
	int			zcalib;    /* calibrated null value for z */
	unsigned char		is_on;     /* whether the device is on or off */
	unsigned char		usage;     /* usage counter */
	struct axis_conversion	ac;        /* hw -> logical axis */
};

static struct acpi_lis3lv02d adev;

static int lis3lv02d_remove_fs(void);
static int lis3lv02d_add_fs(struct acpi_device *device);

/* For automatic insertion of the module */
static struct acpi_device_id lis3lv02d_device_ids[] = {
	{"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, lis3lv02d_device_ids);

/**
 * lis3lv02d_acpi_init - ACPI _INI method: initialize the device.
 * @handle: the handle of the device
 *
 * Returns AE_OK on success.
 */
static inline acpi_status lis3lv02d_acpi_init(acpi_handle handle)
{
	return acpi_evaluate_object(handle, METHOD_NAME__INI, NULL, NULL);
}

/**
 * lis3lv02d_acpi_read - ACPI ALRD method: read a register
 * @handle: the handle of the device
 * @reg:    the register to read
 * @ret:    result of the operation
 *
 * Returns AE_OK on success.
 */
static acpi_status lis3lv02d_acpi_read(acpi_handle handle, int reg, u8 *ret)
{
	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
	struct acpi_object_list args = { 1, &arg0 };
	unsigned long long lret;
	acpi_status status;

	arg0.integer.value = reg;

	status = acpi_evaluate_integer(handle, "ALRD", &args, &lret);
	*ret = lret;
	return status;
}

/**
 * lis3lv02d_acpi_write - ACPI ALWR method: write to a register
 * @handle: the handle of the device
 * @reg:    the register to write to
 * @val:    the value to write
 *
 * Returns AE_OK on success.
 */
static acpi_status lis3lv02d_acpi_write(acpi_handle handle, int reg, u8 val)
{
	unsigned long long ret; /* Not used when writting */
	union acpi_object in_obj[2];
	struct acpi_object_list args = { 2, in_obj };

	in_obj[0].type          = ACPI_TYPE_INTEGER;
	in_obj[0].integer.value = reg;
	in_obj[1].type          = ACPI_TYPE_INTEGER;
	in_obj[1].integer.value = val;

	return acpi_evaluate_integer(handle, "ALWR", &args, &ret);
}

static s16 lis3lv02d_read_16(acpi_handle handle, int reg)
{
	u8 lo, hi;

	lis3lv02d_acpi_read(handle, reg, &lo);
	lis3lv02d_acpi_read(handle, reg + 1, &hi);
	/* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
	return (s16)((hi << 8) | lo);
}

/**
 * lis3lv02d_get_axis - For the given axis, give the value converted
 * @axis:      1,2,3 - can also be negative
 * @hw_values: raw values returned by the hardware
 *
 * Returns the converted value.
 */
static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
{
	if (axis > 0)
		return hw_values[axis - 1];
	else
		return -hw_values[-axis - 1];
}

/**
 * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
 * @handle: the handle to the device
 * @x:      where to store the X axis value
 * @y:      where to store the Y axis value
 * @z:      where to store the Z axis value
 *
 * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
 */
static void lis3lv02d_get_xyz(acpi_handle handle, int *x, int *y, int *z)
{
	int position[3];

	position[0] = lis3lv02d_read_16(handle, OUTX_L);
	position[1] = lis3lv02d_read_16(handle, OUTY_L);
	position[2] = lis3lv02d_read_16(handle, OUTZ_L);

	*x = lis3lv02d_get_axis(adev.ac.x, position);
	*y = lis3lv02d_get_axis(adev.ac.y, position);
	*z = lis3lv02d_get_axis(adev.ac.z, position);
}

static inline void lis3lv02d_poweroff(acpi_handle handle)
{
	adev.is_on = 0;
	/* disable X,Y,Z axis and power down */
	lis3lv02d_acpi_write(handle, CTRL_REG1, 0x00);
}

static void lis3lv02d_poweron(acpi_handle handle)
{
	u8 val;

	adev.is_on = 1;
	lis3lv02d_acpi_init(handle);
	lis3lv02d_acpi_write(handle, FF_WU_CFG, 0);
	/*
	 * BDU: LSB and MSB values are not updated until both have been read.
	 *      So the value read will always be correct.
	 * IEN: Interrupt for free-fall and DD, not for data-ready.
	 */
	lis3lv02d_acpi_read(handle, CTRL_REG2, &val);
	val |= CTRL2_BDU | CTRL2_IEN;
	lis3lv02d_acpi_write(handle, CTRL_REG2, val);
}

#ifdef CONFIG_PM
static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
{
	/* make sure the device is off when we suspend */
	lis3lv02d_poweroff(device->handle);
	return 0;
}

static int lis3lv02d_resume(struct acpi_device *device)
{
	/* put back the device in the right state (ACPI might turn it on) */
	mutex_lock(&adev.lock);
	if (adev.usage > 0)
		lis3lv02d_poweron(device->handle);
	else
		lis3lv02d_poweroff(device->handle);
	mutex_unlock(&adev.lock);
	return 0;
}
#else
#define lis3lv02d_suspend NULL
#define lis3lv02d_resume NULL
#endif


/*
 * To be called before starting to use the device. It makes sure that the
 * device will always be on until a call to lis3lv02d_decrease_use(). Not to be
 * used from interrupt context.
 */
static void lis3lv02d_increase_use(struct acpi_lis3lv02d *dev)
{
	mutex_lock(&dev->lock);
	dev->usage++;
	if (dev->usage == 1) {
		if (!dev->is_on)
			lis3lv02d_poweron(dev->device->handle);
	}
	mutex_unlock(&dev->lock);
}

/*
 * To be called whenever a usage of the device is stopped.
 * It will make sure to turn off the device when there is not usage.
 */
static void lis3lv02d_decrease_use(struct acpi_lis3lv02d *dev)
{
	mutex_lock(&dev->lock);
	dev->usage--;
	if (dev->usage == 0)
		lis3lv02d_poweroff(dev->device->handle);
	mutex_unlock(&dev->lock);
}

/**
 * lis3lv02d_joystick_kthread - Kthread polling function
 * @data: unused - here to conform to threadfn prototype
 */
static int lis3lv02d_joystick_kthread(void *data)
{
	int x, y, z;

	while (!kthread_should_stop()) {
		lis3lv02d_get_xyz(adev.device->handle, &x, &y, &z);
		input_report_abs(adev.idev, ABS_X, x - adev.xcalib);
		input_report_abs(adev.idev, ABS_Y, y - adev.ycalib);
		input_report_abs(adev.idev, ABS_Z, z - adev.zcalib);

		input_sync(adev.idev);

		try_to_freeze();
		msleep_interruptible(MDPS_POLL_INTERVAL);
	}

	return 0;
}

static int lis3lv02d_joystick_open(struct input_dev *input)
{
	lis3lv02d_increase_use(&adev);
	adev.kthread = kthread_run(lis3lv02d_joystick_kthread, NULL, "klis3lv02d");
	if (IS_ERR(adev.kthread)) {
		lis3lv02d_decrease_use(&adev);
		return PTR_ERR(adev.kthread);
	}

	return 0;
}

static void lis3lv02d_joystick_close(struct input_dev *input)
{
	kthread_stop(adev.kthread);
	lis3lv02d_decrease_use(&adev);
}


static inline void lis3lv02d_calibrate_joystick(void)
{
	lis3lv02d_get_xyz(adev.device->handle, &adev.xcalib, &adev.ycalib, &adev.zcalib);
}

static int lis3lv02d_joystick_enable(void)
{
	int err;

	if (adev.idev)
		return -EINVAL;

	adev.idev = input_allocate_device();
	if (!adev.idev)
		return -ENOMEM;

	lis3lv02d_calibrate_joystick();

	adev.idev->name       = "ST LIS3LV02DL Accelerometer";
	adev.idev->phys       = DRIVER_NAME "/input0";
	adev.idev->id.bustype = BUS_HOST;
	adev.idev->id.vendor  = 0;
	adev.idev->dev.parent = &adev.pdev->dev;
	adev.idev->open       = lis3lv02d_joystick_open;
	adev.idev->close      = lis3lv02d_joystick_close;

	set_bit(EV_ABS, adev.idev->evbit);
	input_set_abs_params(adev.idev, ABS_X, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
	input_set_abs_params(adev.idev, ABS_Y, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
	input_set_abs_params(adev.idev, ABS_Z, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);

	err = input_register_device(adev.idev);
	if (err) {
		input_free_device(adev.idev);
		adev.idev = NULL;
	}

	return err;
}

static void lis3lv02d_joystick_disable(void)
{
	if (!adev.idev)
		return;

	input_unregister_device(adev.idev);
	adev.idev = NULL;
}


/*
 * Initialise the accelerometer and the various subsystems.
 * Should be rather independant of the bus system.
 */
static int lis3lv02d_init_device(struct acpi_lis3lv02d *dev)
{
	mutex_init(&dev->lock);
	lis3lv02d_add_fs(dev->device);
	lis3lv02d_increase_use(dev);

	if (lis3lv02d_joystick_enable())
		printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n");

	lis3lv02d_decrease_use(dev);
	return 0;
}

static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi)
{
	adev.ac = *((struct axis_conversion *)dmi->driver_data);
	printk(KERN_INFO DRIVER_NAME ": hardware type %s found.\n", dmi->ident);

	return 1;
}

/* Represents, for each axis seen by userspace, the corresponding hw axis (+1).
 * If the value is negative, the opposite of the hw value is used. */
static struct axis_conversion lis3lv02d_axis_normal = {1, 2, 3};
static struct axis_conversion lis3lv02d_axis_y_inverted = {1, -2, 3};
static struct axis_conversion lis3lv02d_axis_x_inverted = {-1, 2, 3};
static struct axis_conversion lis3lv02d_axis_z_inverted = {1, 2, -3};
static struct axis_conversion lis3lv02d_axis_xy_rotated_left = {-2, 1, 3};
static struct axis_conversion lis3lv02d_axis_xy_swap_inverted = {-2, -1, 3};

#define AXIS_DMI_MATCH(_ident, _name, _axis) {		\
	.ident = _ident,				\
	.callback = lis3lv02d_dmi_matched,		\
	.matches = {					\
		DMI_MATCH(DMI_PRODUCT_NAME, _name)	\
	},						\
	.driver_data = &lis3lv02d_axis_##_axis		\
}
static struct dmi_system_id lis3lv02d_dmi_ids[] = {
	/* product names are truncated to match all kinds of a same model */
	AXIS_DMI_MATCH("NC64x0", "HP Compaq nc64", x_inverted),
	AXIS_DMI_MATCH("NC84x0", "HP Compaq nc84", z_inverted),
	AXIS_DMI_MATCH("NX9420", "HP Compaq nx9420", x_inverted),
	AXIS_DMI_MATCH("NW9440", "HP Compaq nw9440", x_inverted),
	AXIS_DMI_MATCH("NC2510", "HP Compaq 2510", y_inverted),
	AXIS_DMI_MATCH("NC8510", "HP Compaq 8510", xy_swap_inverted),
	AXIS_DMI_MATCH("HP2133", "HP 2133", xy_rotated_left),
	{ NULL, }
/* Laptop models without axis info (yet):
 * "NC651xx" "HP Compaq 651"
 * "NC671xx" "HP Compaq 671"
 * "NC6910" "HP Compaq 6910"
 * HP Compaq 8710x Notebook PC / Mobile Workstation
 * "NC2400" "HP Compaq nc2400"
 * "NX74x0" "HP Compaq nx74"
 * "NX6325" "HP Compaq nx6325"
 * "NC4400" "HP Compaq nc4400"
 */
};

static int lis3lv02d_add(struct acpi_device *device)
{
	u8 val;

	if (!device)
		return -EINVAL;

	adev.device = device;
	strcpy(acpi_device_name(device), DRIVER_NAME);
	strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
	device->driver_data = &adev;

	lis3lv02d_acpi_read(device->handle, WHO_AM_I, &val);
	if ((val != LIS3LV02DL_ID) && (val != LIS302DL_ID)) {
		printk(KERN_ERR DRIVER_NAME
				": Accelerometer chip not LIS3LV02D{L,Q}\n");
	}

	/* If possible use a "standard" axes order */
	if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
		printk(KERN_INFO DRIVER_NAME ": laptop model unknown, "
				 "using default axes configuration\n");
		adev.ac = lis3lv02d_axis_normal;
	}

	return lis3lv02d_init_device(&adev);
}

static int lis3lv02d_remove(struct acpi_device *device, int type)
{
	if (!device)
		return -EINVAL;

	lis3lv02d_joystick_disable();
	lis3lv02d_poweroff(device->handle);

	return lis3lv02d_remove_fs();
}


/* Sysfs stuff */
static ssize_t lis3lv02d_position_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	int x, y, z;

	lis3lv02d_increase_use(&adev);
	lis3lv02d_get_xyz(adev.device->handle, &x, &y, &z);
	lis3lv02d_decrease_use(&adev);
	return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
}

static ssize_t lis3lv02d_calibrate_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "(%d,%d,%d)\n", adev.xcalib, adev.ycalib, adev.zcalib);
}

static ssize_t lis3lv02d_calibrate_store(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t count)
{
	lis3lv02d_increase_use(&adev);
	lis3lv02d_calibrate_joystick();
	lis3lv02d_decrease_use(&adev);
	return count;
}

/* conversion btw sampling rate and the register values */
static int lis3lv02dl_df_val[4] = {40, 160, 640, 2560};
static ssize_t lis3lv02d_rate_show(struct device *dev,
			struct device_attribute *attr, char *buf)
{
	u8 ctrl;
	int val;

	lis3lv02d_increase_use(&adev);
	lis3lv02d_acpi_read(adev.device->handle, CTRL_REG1, &ctrl);
	lis3lv02d_decrease_use(&adev);
	val = (ctrl & (CTRL1_DF0 | CTRL1_DF1)) >> 4;
	return sprintf(buf, "%d\n", lis3lv02dl_df_val[val]);
}

static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
static DEVICE_ATTR(calibrate, S_IRUGO|S_IWUSR, lis3lv02d_calibrate_show,
	lis3lv02d_calibrate_store);
static DEVICE_ATTR(rate, S_IRUGO, lis3lv02d_rate_show, NULL);

static struct attribute *lis3lv02d_attributes[] = {
	&dev_attr_position.attr,
	&dev_attr_calibrate.attr,
	&dev_attr_rate.attr,
	NULL
};

static struct attribute_group lis3lv02d_attribute_group = {
	.attrs = lis3lv02d_attributes
};

static int lis3lv02d_add_fs(struct acpi_device *device)
{
	adev.pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
	if (IS_ERR(adev.pdev))
		return PTR_ERR(adev.pdev);

	return sysfs_create_group(&adev.pdev->dev.kobj, &lis3lv02d_attribute_group);
}

static int lis3lv02d_remove_fs(void)
{
	sysfs_remove_group(&adev.pdev->dev.kobj, &lis3lv02d_attribute_group);
	platform_device_unregister(adev.pdev);
	return 0;
}

/* For the HP MDPS aka 3D Driveguard */
static struct acpi_driver lis3lv02d_driver = {
	.name  = DRIVER_NAME,
	.class = ACPI_MDPS_CLASS,
	.ids   = lis3lv02d_device_ids,
	.ops = {
		.add     = lis3lv02d_add,
		.remove  = lis3lv02d_remove,
		.suspend = lis3lv02d_suspend,
		.resume  = lis3lv02d_resume,
	}
};

static int __init lis3lv02d_init_module(void)
{
	int ret;

	if (acpi_disabled)
		return -ENODEV;

	ret = acpi_bus_register_driver(&lis3lv02d_driver);
	if (ret < 0)
		return ret;

	printk(KERN_INFO DRIVER_NAME " driver loaded.\n");

	return 0;
}

static void __exit lis3lv02d_exit_module(void)
{
	acpi_bus_unregister_driver(&lis3lv02d_driver);
}

MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
MODULE_AUTHOR("Yan Burman and Eric Piel");
MODULE_LICENSE("GPL");

module_init(lis3lv02d_init_module);
module_exit(lis3lv02d_exit_module);