aboutsummaryrefslogtreecommitdiff
path: root/drivers/input/misc/cma3000_d0x.c
blob: a3735a01e9fd430820037872e5050e8203661a20 (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
/*
 * VTI CMA3000_D0x Accelerometer driver
 *
 * Copyright (C) 2010 Texas Instruments
 * Author: Hemanth V <hemanthv@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/input/cma3000.h>
#include <linux/module.h>

#include "cma3000_d0x.h"

#define CMA3000_WHOAMI      0x00
#define CMA3000_REVID       0x01
#define CMA3000_CTRL        0x02
#define CMA3000_STATUS      0x03
#define CMA3000_RSTR        0x04
#define CMA3000_INTSTATUS   0x05
#define CMA3000_DOUTX       0x06
#define CMA3000_DOUTY       0x07
#define CMA3000_DOUTZ       0x08
#define CMA3000_MDTHR       0x09
#define CMA3000_MDFFTMR     0x0A
#define CMA3000_FFTHR       0x0B

#define CMA3000_RANGE2G    (1 << 7)
#define CMA3000_RANGE8G    (0 << 7)
#define CMA3000_BUSI2C     (0 << 4)
#define CMA3000_MODEMASK   (7 << 1)
#define CMA3000_GRANGEMASK (1 << 7)

#define CMA3000_STATUS_PERR    1
#define CMA3000_INTSTATUS_FFDET (1 << 2)

/* Settling time delay in ms */
#define CMA3000_SETDELAY    30

/* Delay for clearing interrupt in us */
#define CMA3000_INTDELAY    44


/*
 * Bit weights in mg for bit 0, other bits need
 * multipy factor 2^n. Eight bit is the sign bit.
 */
#define BIT_TO_2G  18
#define BIT_TO_8G  71

struct cma3000_accl_data {
	const struct cma3000_bus_ops *bus_ops;
	const struct cma3000_platform_data *pdata;

	struct device *dev;
	struct input_dev *input_dev;

	int bit_to_mg;
	int irq;

	int g_range;
	u8 mode;

	struct mutex mutex;
	bool opened;
	bool suspended;
};

#define CMA3000_READ(data, reg, msg) \
	(data->bus_ops->read(data->dev, reg, msg))
#define CMA3000_SET(data, reg, val, msg) \
	((data)->bus_ops->write(data->dev, reg, val, msg))

/*
 * Conversion for each of the eight modes to g, depending
 * on G range i.e 2G or 8G. Some modes always operate in
 * 8G.
 */

static int mode_to_mg[8][2] = {
	{ 0, 0 },
	{ BIT_TO_8G, BIT_TO_2G },
	{ BIT_TO_8G, BIT_TO_2G },
	{ BIT_TO_8G, BIT_TO_8G },
	{ BIT_TO_8G, BIT_TO_8G },
	{ BIT_TO_8G, BIT_TO_2G },
	{ BIT_TO_8G, BIT_TO_2G },
	{ 0, 0},
};

static void decode_mg(struct cma3000_accl_data *data, int *datax,
				int *datay, int *dataz)
{
	/* Data in 2's complement, convert to mg */
	*datax = ((s8)*datax) * data->bit_to_mg;
	*datay = ((s8)*datay) * data->bit_to_mg;
	*dataz = ((s8)*dataz) * data->bit_to_mg;
}

static irqreturn_t cma3000_thread_irq(int irq, void *dev_id)
{
	struct cma3000_accl_data *data = dev_id;
	int datax, datay, dataz, intr_status;
	u8 ctrl, mode, range;

	intr_status = CMA3000_READ(data, CMA3000_INTSTATUS, "interrupt status");
	if (intr_status < 0)
		return IRQ_NONE;

	/* Check if free fall is detected, report immediately */
	if (intr_status & CMA3000_INTSTATUS_FFDET) {
		input_report_abs(data->input_dev, ABS_MISC, 1);
		input_sync(data->input_dev);
	} else {
		input_report_abs(data->input_dev, ABS_MISC, 0);
	}

	datax = CMA3000_READ(data, CMA3000_DOUTX, "X");
	datay = CMA3000_READ(data, CMA3000_DOUTY, "Y");
	dataz = CMA3000_READ(data, CMA3000_DOUTZ, "Z");

	ctrl = CMA3000_READ(data, CMA3000_CTRL, "ctrl");
	mode = (ctrl & CMA3000_MODEMASK) >> 1;
	range = (ctrl & CMA3000_GRANGEMASK) >> 7;

	data->bit_to_mg = mode_to_mg[mode][range];

	/* Interrupt not for this device */
	if (data->bit_to_mg == 0)
		return IRQ_NONE;

	/* Decode register values to milli g */
	decode_mg(data, &datax, &datay, &dataz);

	input_report_abs(data->input_dev, ABS_X, datax);
	input_report_abs(data->input_dev, ABS_Y, datay);
	input_report_abs(data->input_dev, ABS_Z, dataz);
	input_sync(data->input_dev);

	return IRQ_HANDLED;
}

static int cma3000_reset(struct cma3000_accl_data *data)
{
	int val;

	/* Reset sequence */
	CMA3000_SET(data, CMA3000_RSTR, 0x02, "Reset");
	CMA3000_SET(data, CMA3000_RSTR, 0x0A, "Reset");
	CMA3000_SET(data, CMA3000_RSTR, 0x04, "Reset");

	/* Settling time delay */
	mdelay(10);

	val = CMA3000_READ(data, CMA3000_STATUS, "Status");
	if (val < 0) {
		dev_err(data->dev, "Reset failed\n");
		return val;
	}

	if (val & CMA3000_STATUS_PERR) {
		dev_err(data->dev, "Parity Error\n");
		return -EIO;
	}

	return 0;
}

static int cma3000_poweron(struct cma3000_accl_data *data)
{
	const struct cma3000_platform_data *pdata = data->pdata;
	u8 ctrl = 0;
	int ret;

	if (data->g_range == CMARANGE_2G) {
		ctrl = (data->mode << 1) | CMA3000_RANGE2G;
	} else if (data->g_range == CMARANGE_8G) {
		ctrl = (data->mode << 1) | CMA3000_RANGE8G;
	} else {
		dev_info(data->dev,
			 "Invalid G range specified, assuming 8G\n");
		ctrl = (data->mode << 1) | CMA3000_RANGE8G;
	}

	ctrl |= data->bus_ops->ctrl_mod;

	CMA3000_SET(data, CMA3000_MDTHR, pdata->mdthr,
		    "Motion Detect Threshold");
	CMA3000_SET(data, CMA3000_MDFFTMR, pdata->mdfftmr,
		    "Time register");
	CMA3000_SET(data, CMA3000_FFTHR, pdata->ffthr,
		    "Free fall threshold");
	ret = CMA3000_SET(data, CMA3000_CTRL, ctrl, "Mode setting");
	if (ret < 0)
		return -EIO;

	msleep(CMA3000_SETDELAY);

	return 0;
}

static int cma3000_poweroff(struct cma3000_accl_data *data)
{
	int ret;

	ret = CMA3000_SET(data, CMA3000_CTRL, CMAMODE_POFF, "Mode setting");
	msleep(CMA3000_SETDELAY);

	return ret;
}

static int cma3000_open(struct input_dev *input_dev)
{
	struct cma3000_accl_data *data = input_get_drvdata(input_dev);

	mutex_lock(&data->mutex);

	if (!data->suspended)
		cma3000_poweron(data);

	data->opened = true;

	mutex_unlock(&data->mutex);

	return 0;
}

static void cma3000_close(struct input_dev *input_dev)
{
	struct cma3000_accl_data *data = input_get_drvdata(input_dev);

	mutex_lock(&data->mutex);

	if (!data->suspended)
		cma3000_poweroff(data);

	data->opened = false;

	mutex_unlock(&data->mutex);
}

void cma3000_suspend(struct cma3000_accl_data *data)
{
	mutex_lock(&data->mutex);

	if (!data->suspended && data->opened)
		cma3000_poweroff(data);

	data->suspended = true;

	mutex_unlock(&data->mutex);
}
EXPORT_SYMBOL(cma3000_suspend);


void cma3000_resume(struct cma3000_accl_data *data)
{
	mutex_lock(&data->mutex);

	if (data->suspended && data->opened)
		cma3000_poweron(data);

	data->suspended = false;

	mutex_unlock(&data->mutex);
}
EXPORT_SYMBOL(cma3000_resume);

struct cma3000_accl_data *cma3000_init(struct device *dev, int irq,
				       const struct cma3000_bus_ops *bops)
{
	const struct cma3000_platform_data *pdata = dev->platform_data;
	struct cma3000_accl_data *data;
	struct input_dev *input_dev;
	int rev;
	int error;

	if (!pdata) {
		dev_err(dev, "platform data not found\n");
		error = -EINVAL;
		goto err_out;
	}


	/* if no IRQ return error */
	if (irq == 0) {
		error = -EINVAL;
		goto err_out;
	}

	data = kzalloc(sizeof(struct cma3000_accl_data), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!data || !input_dev) {
		error = -ENOMEM;
		goto err_free_mem;
	}

	data->dev = dev;
	data->input_dev = input_dev;
	data->bus_ops = bops;
	data->pdata = pdata;
	data->irq = irq;
	mutex_init(&data->mutex);

	data->mode = pdata->mode;
	if (data->mode > CMAMODE_POFF) {
		data->mode = CMAMODE_MOTDET;
		dev_warn(dev,
			 "Invalid mode specified, assuming Motion Detect\n");
	}

	data->g_range = pdata->g_range;
	if (data->g_range != CMARANGE_2G && data->g_range != CMARANGE_8G) {
		dev_info(dev,
			 "Invalid G range specified, assuming 8G\n");
		data->g_range = CMARANGE_8G;
	}

	input_dev->name = "cma3000-accelerometer";
	input_dev->id.bustype = bops->bustype;
	input_dev->open = cma3000_open;
	input_dev->close = cma3000_close;

	 __set_bit(EV_ABS, input_dev->evbit);

	input_set_abs_params(input_dev, ABS_X,
			-data->g_range, data->g_range, pdata->fuzz_x, 0);
	input_set_abs_params(input_dev, ABS_Y,
			-data->g_range, data->g_range, pdata->fuzz_y, 0);
	input_set_abs_params(input_dev, ABS_Z,
			-data->g_range, data->g_range, pdata->fuzz_z, 0);
	input_set_abs_params(input_dev, ABS_MISC, 0, 1, 0, 0);

	input_set_drvdata(input_dev, data);

	error = cma3000_reset(data);
	if (error)
		goto err_free_mem;

	rev = CMA3000_READ(data, CMA3000_REVID, "Revid");
	if (rev < 0) {
		error = rev;
		goto err_free_mem;
	}

	pr_info("CMA3000 Accelerometer: Revision %x\n", rev);

	error = request_threaded_irq(irq, NULL, cma3000_thread_irq,
				     pdata->irqflags | IRQF_ONESHOT,
				     "cma3000_d0x", data);
	if (error) {
		dev_err(dev, "request_threaded_irq failed\n");
		goto err_free_mem;
	}

	error = input_register_device(data->input_dev);
	if (error) {
		dev_err(dev, "Unable to register input device\n");
		goto err_free_irq;
	}

	return data;

err_free_irq:
	free_irq(irq, data);
err_free_mem:
	input_free_device(input_dev);
	kfree(data);
err_out:
	return ERR_PTR(error);
}
EXPORT_SYMBOL(cma3000_init);

void cma3000_exit(struct cma3000_accl_data *data)
{
	free_irq(data->irq, data);
	input_unregister_device(data->input_dev);
	kfree(data);
}
EXPORT_SYMBOL(cma3000_exit);

MODULE_DESCRIPTION("CMA3000-D0x Accelerometer Driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Hemanth V <hemanthv@ti.com>");