summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/input/misc/mpu3050.c
blob: 5e5051351c3a87f71b2d1b047149810c43f280b4 (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
/*
 * MPU3050 Tri-axis gyroscope driver
 *
 * Copyright (C) 2011 Wistron Co.Ltd
 * Joseph Lai <joseph_lai@wistron.com>
 *
 * Trimmed down by Alan Cox <alan@linux.intel.com> to produce this version
 *
 * This is a 'lite' version of the driver, while we consider the right way
 * to present the other features to user space. In particular it requires the
 * device has an IRQ, and it only provides an input interface, so is not much
 * use for device orientation. A fuller version is available from the Meego
 * tree.
 *
 * This program is based on bma023.c.
 *
 * 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; version 2 of the License.
 *
 * 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/module.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>

#define MPU3050_CHIP_ID		0x69

#define MPU3050_AUTO_DELAY	1000

#define MPU3050_MIN_VALUE	-32768
#define MPU3050_MAX_VALUE	32767

#define MPU3050_DEFAULT_POLL_INTERVAL	200
#define MPU3050_DEFAULT_FS_RANGE	3

/* Register map */
#define MPU3050_CHIP_ID_REG	0x00
#define MPU3050_SMPLRT_DIV	0x15
#define MPU3050_DLPF_FS_SYNC	0x16
#define MPU3050_INT_CFG		0x17
#define MPU3050_XOUT_H		0x1D
#define MPU3050_PWR_MGM		0x3E
#define MPU3050_PWR_MGM_POS	6

/* Register bits */

/* DLPF_FS_SYNC */
#define MPU3050_EXT_SYNC_NONE		0x00
#define MPU3050_EXT_SYNC_TEMP		0x20
#define MPU3050_EXT_SYNC_GYROX		0x40
#define MPU3050_EXT_SYNC_GYROY		0x60
#define MPU3050_EXT_SYNC_GYROZ		0x80
#define MPU3050_EXT_SYNC_ACCELX	0xA0
#define MPU3050_EXT_SYNC_ACCELY	0xC0
#define MPU3050_EXT_SYNC_ACCELZ	0xE0
#define MPU3050_EXT_SYNC_MASK		0xE0
#define MPU3050_FS_250DPS		0x00
#define MPU3050_FS_500DPS		0x08
#define MPU3050_FS_1000DPS		0x10
#define MPU3050_FS_2000DPS		0x18
#define MPU3050_FS_MASK		0x18
#define MPU3050_DLPF_CFG_256HZ_NOLPF2	0x00
#define MPU3050_DLPF_CFG_188HZ		0x01
#define MPU3050_DLPF_CFG_98HZ		0x02
#define MPU3050_DLPF_CFG_42HZ		0x03
#define MPU3050_DLPF_CFG_20HZ		0x04
#define MPU3050_DLPF_CFG_10HZ		0x05
#define MPU3050_DLPF_CFG_5HZ		0x06
#define MPU3050_DLPF_CFG_2100HZ_NOLPF	0x07
#define MPU3050_DLPF_CFG_MASK		0x07
/* INT_CFG */
#define MPU3050_RAW_RDY_EN		0x01
#define MPU3050_MPU_RDY_EN		0x02
#define MPU3050_LATCH_INT_EN		0x04
/* PWR_MGM */
#define MPU3050_PWR_MGM_PLL_X		0x01
#define MPU3050_PWR_MGM_PLL_Y		0x02
#define MPU3050_PWR_MGM_PLL_Z		0x03
#define MPU3050_PWR_MGM_CLKSEL		0x07
#define MPU3050_PWR_MGM_STBY_ZG	0x08
#define MPU3050_PWR_MGM_STBY_YG	0x10
#define MPU3050_PWR_MGM_STBY_XG	0x20
#define MPU3050_PWR_MGM_SLEEP		0x40
#define MPU3050_PWR_MGM_RESET		0x80
#define MPU3050_PWR_MGM_MASK		0x40

struct axis_data {
	s16 x;
	s16 y;
	s16 z;
};

struct mpu3050_sensor {
	struct i2c_client *client;
	struct device *dev;
	struct input_dev *idev;
};

/**
 *	mpu3050_xyz_read_reg	-	read the axes values
 *	@buffer: provide register addr and get register
 *	@length: length of register
 *
 *	Reads the register values in one transaction or returns a negative
 *	error code on failure.
 */
static int mpu3050_xyz_read_reg(struct i2c_client *client,
			       u8 *buffer, int length)
{
	/*
	 * Annoying we can't make this const because the i2c layer doesn't
	 * declare input buffers const.
	 */
	char cmd = MPU3050_XOUT_H;
	struct i2c_msg msg[] = {
		{
			.addr = client->addr,
			.flags = 0,
			.len = 1,
			.buf = &cmd,
		},
		{
			.addr = client->addr,
			.flags = I2C_M_RD,
			.len = length,
			.buf = buffer,
		},
	};

	return i2c_transfer(client->adapter, msg, 2);
}

/**
 *	mpu3050_read_xyz	-	get co-ordinates from device
 *	@client: i2c address of sensor
 *	@coords: co-ordinates to update
 *
 *	Return the converted X Y and Z co-ordinates from the sensor device
 */
static void mpu3050_read_xyz(struct i2c_client *client,
			     struct axis_data *coords)
{
	u16 buffer[3];

	mpu3050_xyz_read_reg(client, (u8 *)buffer, 6);
	coords->x = be16_to_cpu(buffer[0]);
	coords->y = be16_to_cpu(buffer[1]);
	coords->z = be16_to_cpu(buffer[2]);
	dev_dbg(&client->dev, "%s: x %d, y %d, z %d\n", __func__,
					coords->x, coords->y, coords->z);
}

/**
 *	mpu3050_set_power_mode	-	set the power mode
 *	@client: i2c client for the sensor
 *	@val: value to switch on/off of power, 1: normal power, 0: low power
 *
 *	Put device to normal-power mode or low-power mode.
 */
static void mpu3050_set_power_mode(struct i2c_client *client, u8 val)
{
	u8 value;

	value = i2c_smbus_read_byte_data(client, MPU3050_PWR_MGM);
	value = (value & ~MPU3050_PWR_MGM_MASK) |
		(((val << MPU3050_PWR_MGM_POS) & MPU3050_PWR_MGM_MASK) ^
		 MPU3050_PWR_MGM_MASK);
	i2c_smbus_write_byte_data(client, MPU3050_PWR_MGM, value);
}

/**
 *	mpu3050_input_open	-	called on input event open
 *	@input: input dev of opened device
 *
 *	The input layer calls this function when input event is opened. The
 *	function will push the device to resume. Then, the device is ready
 *	to provide data.
 */
static int mpu3050_input_open(struct input_dev *input)
{
	struct mpu3050_sensor *sensor = input_get_drvdata(input);
	int error;

	pm_runtime_get(sensor->dev);

	/* Enable interrupts */
	error = i2c_smbus_write_byte_data(sensor->client, MPU3050_INT_CFG,
					  MPU3050_LATCH_INT_EN |
					  MPU3050_RAW_RDY_EN |
					  MPU3050_MPU_RDY_EN);
	if (error < 0) {
		pm_runtime_put(sensor->dev);
		return error;
	}

	return 0;
}

/**
 *	mpu3050_input_close	-	called on input event close
 *	@input: input dev of closed device
 *
 *	The input layer calls this function when input event is closed. The
 *	function will push the device to suspend.
 */
static void mpu3050_input_close(struct input_dev *input)
{
	struct mpu3050_sensor *sensor = input_get_drvdata(input);

	pm_runtime_put(sensor->dev);
}

/**
 *	mpu3050_interrupt_thread	-	handle an IRQ
 *	@irq: interrupt numner
 *	@data: the sensor
 *
 *	Called by the kernel single threaded after an interrupt occurs. Read
 *	the sensor data and generate an input event for it.
 */
static irqreturn_t mpu3050_interrupt_thread(int irq, void *data)
{
	struct mpu3050_sensor *sensor = data;
	struct axis_data axis;

	mpu3050_read_xyz(sensor->client, &axis);

	input_report_abs(sensor->idev, ABS_X, axis.x);
	input_report_abs(sensor->idev, ABS_Y, axis.y);
	input_report_abs(sensor->idev, ABS_Z, axis.z);
	input_sync(sensor->idev);

	return IRQ_HANDLED;
}

/**
 *	mpu3050_hw_init	-	initialize hardware
 *	@sensor: the sensor
 *
 *	Called during device probe; configures the sampling method.
 */
static int mpu3050_hw_init(struct mpu3050_sensor *sensor)
{
	struct i2c_client *client = sensor->client;
	int ret;
	u8 reg;

	/* Reset */
	ret = i2c_smbus_write_byte_data(client, MPU3050_PWR_MGM,
					MPU3050_PWR_MGM_RESET);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_read_byte_data(client, MPU3050_PWR_MGM);
	if (ret < 0)
		return ret;

	ret &= ~MPU3050_PWR_MGM_CLKSEL;
	ret |= MPU3050_PWR_MGM_PLL_Z;
	ret = i2c_smbus_write_byte_data(client, MPU3050_PWR_MGM, ret);
	if (ret < 0)
		return ret;

	/* Output frequency divider. The poll interval */
	ret = i2c_smbus_write_byte_data(client, MPU3050_SMPLRT_DIV,
					MPU3050_DEFAULT_POLL_INTERVAL - 1);
	if (ret < 0)
		return ret;

	/* Set low pass filter and full scale */
	reg = MPU3050_DEFAULT_FS_RANGE;
	reg |= MPU3050_DLPF_CFG_42HZ << 3;
	reg |= MPU3050_EXT_SYNC_NONE << 5;
	ret = i2c_smbus_write_byte_data(client, MPU3050_DLPF_FS_SYNC, reg);
	if (ret < 0)
		return ret;

	return 0;
}

/**
 *	mpu3050_probe	-	device detection callback
 *	@client: i2c client of found device
 *	@id: id match information
 *
 *	The I2C layer calls us when it believes a sensor is present at this
 *	address. Probe to see if this is correct and to validate the device.
 *
 *	If present install the relevant sysfs interfaces and input device.
 */
static int mpu3050_probe(struct i2c_client *client,
				   const struct i2c_device_id *id)
{
	struct mpu3050_sensor *sensor;
	struct input_dev *idev;
	int ret;
	int error;

	sensor = kzalloc(sizeof(struct mpu3050_sensor), GFP_KERNEL);
	idev = input_allocate_device();
	if (!sensor || !idev) {
		dev_err(&client->dev, "failed to allocate driver data\n");
		error = -ENOMEM;
		goto err_free_mem;
	}

	sensor->client = client;
	sensor->dev = &client->dev;
	sensor->idev = idev;

	mpu3050_set_power_mode(client, 1);
	msleep(10);

	ret = i2c_smbus_read_byte_data(client, MPU3050_CHIP_ID_REG);
	if (ret < 0) {
		dev_err(&client->dev, "failed to detect device\n");
		error = -ENXIO;
		goto err_free_mem;
	}

	if (ret != MPU3050_CHIP_ID) {
		dev_err(&client->dev, "unsupported chip id\n");
		error = -ENXIO;
		goto err_free_mem;
	}

	idev->name = "MPU3050";
	idev->id.bustype = BUS_I2C;
	idev->dev.parent = &client->dev;

	idev->open = mpu3050_input_open;
	idev->close = mpu3050_input_close;

	__set_bit(EV_ABS, idev->evbit);
	input_set_abs_params(idev, ABS_X,
			     MPU3050_MIN_VALUE, MPU3050_MAX_VALUE, 0, 0);
	input_set_abs_params(idev, ABS_Y,
			     MPU3050_MIN_VALUE, MPU3050_MAX_VALUE, 0, 0);
	input_set_abs_params(idev, ABS_Z,
			     MPU3050_MIN_VALUE, MPU3050_MAX_VALUE, 0, 0);

	input_set_drvdata(idev, sensor);

	pm_runtime_set_active(&client->dev);

	error = mpu3050_hw_init(sensor);
	if (error)
		goto err_pm_set_suspended;

	error = request_threaded_irq(client->irq,
				     NULL, mpu3050_interrupt_thread,
				     IRQF_TRIGGER_RISING | IRQF_ONESHOT,
				     "mpu3050", sensor);
	if (error) {
		dev_err(&client->dev,
			"can't get IRQ %d, error %d\n", client->irq, error);
		goto err_pm_set_suspended;
	}

	error = input_register_device(idev);
	if (error) {
		dev_err(&client->dev, "failed to register input device\n");
		goto err_free_irq;
	}

	pm_runtime_enable(&client->dev);
	pm_runtime_set_autosuspend_delay(&client->dev, MPU3050_AUTO_DELAY);
	i2c_set_clientdata(client, sensor);

	return 0;

err_free_irq:
	free_irq(client->irq, sensor);
err_pm_set_suspended:
	pm_runtime_set_suspended(&client->dev);
err_free_mem:
	input_free_device(idev);
	kfree(sensor);
	return error;
}

/**
 *	mpu3050_remove	-	remove a sensor
 *	@client: i2c client of sensor being removed
 *
 *	Our sensor is going away, clean up the resources.
 */
static int mpu3050_remove(struct i2c_client *client)
{
	struct mpu3050_sensor *sensor = i2c_get_clientdata(client);

	pm_runtime_disable(&client->dev);
	pm_runtime_set_suspended(&client->dev);

	free_irq(client->irq, sensor);
	input_unregister_device(sensor->idev);
	kfree(sensor);

	return 0;
}

#ifdef CONFIG_PM
/**
 *	mpu3050_suspend		-	called on device suspend
 *	@dev: device being suspended
 *
 *	Put the device into sleep mode before we suspend the machine.
 */
static int mpu3050_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

	mpu3050_set_power_mode(client, 0);

	return 0;
}

/**
 *	mpu3050_resume		-	called on device resume
 *	@dev: device being resumed
 *
 *	Put the device into powered mode on resume.
 */
static int mpu3050_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);

	mpu3050_set_power_mode(client, 1);
	msleep(100);  /* wait for gyro chip resume */

	return 0;
}
#endif

static UNIVERSAL_DEV_PM_OPS(mpu3050_pm, mpu3050_suspend, mpu3050_resume, NULL);

static const struct i2c_device_id mpu3050_ids[] = {
	{ "mpu3050", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, mpu3050_ids);

static const struct of_device_id mpu3050_of_match[] = {
	{ .compatible = "invn,mpu3050", },
	{ },
};
MODULE_DEVICE_TABLE(of, mpu3050_of_match);

static struct i2c_driver mpu3050_i2c_driver = {
	.driver	= {
		.name	= "mpu3050",
		.owner	= THIS_MODULE,
		.pm	= &mpu3050_pm,
		.of_match_table = mpu3050_of_match,
	},
	.probe		= mpu3050_probe,
	.remove		= mpu3050_remove,
	.id_table	= mpu3050_ids,
};

module_i2c_driver(mpu3050_i2c_driver);

MODULE_AUTHOR("Wistron Corp.");
MODULE_DESCRIPTION("MPU3050 Tri-axis gyroscope driver");
MODULE_LICENSE("GPL");