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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2011 Kionix, Inc.
4 * Written by Chris Hudson <chudson@kionix.com>
5 */
6
7#include <linux/delay.h>
8#include <linux/i2c.h>
9#include <linux/input.h>
10#include <linux/interrupt.h>
11#include <linux/module.h>
12#include <linux/slab.h>
13#include <linux/input/kxtj9.h>
14
15#define NAME "kxtj9"
16#define G_MAX 8000
17/* OUTPUT REGISTERS */
18#define XOUT_L 0x06
19#define WHO_AM_I 0x0F
20/* CONTROL REGISTERS */
21#define INT_REL 0x1A
22#define CTRL_REG1 0x1B
23#define INT_CTRL1 0x1E
24#define DATA_CTRL 0x21
25/* CONTROL REGISTER 1 BITS */
26#define PC1_OFF 0x7F
27#define PC1_ON (1 << 7)
28/* Data ready funtion enable bit: set during probe if using irq mode */
29#define DRDYE (1 << 5)
30/* DATA CONTROL REGISTER BITS */
31#define ODR12_5F 0
32#define ODR25F 1
33#define ODR50F 2
34#define ODR100F 3
35#define ODR200F 4
36#define ODR400F 5
37#define ODR800F 6
38/* INTERRUPT CONTROL REGISTER 1 BITS */
39/* Set these during probe if using irq mode */
40#define KXTJ9_IEL (1 << 3)
41#define KXTJ9_IEA (1 << 4)
42#define KXTJ9_IEN (1 << 5)
43/* INPUT_ABS CONSTANTS */
44#define FUZZ 3
45#define FLAT 3
46/* RESUME STATE INDICES */
47#define RES_DATA_CTRL 0
48#define RES_CTRL_REG1 1
49#define RES_INT_CTRL1 2
50#define RESUME_ENTRIES 3
51
52/*
53 * The following table lists the maximum appropriate poll interval for each
54 * available output data rate.
55 */
56static const struct {
57 unsigned int cutoff;
58 u8 mask;
59} kxtj9_odr_table[] = {
60 { 3, ODR800F },
61 { 5, ODR400F },
62 { 10, ODR200F },
63 { 20, ODR100F },
64 { 40, ODR50F },
65 { 80, ODR25F },
66 { 0, ODR12_5F},
67};
68
69struct kxtj9_data {
70 struct i2c_client *client;
71 struct kxtj9_platform_data pdata;
72 struct input_dev *input_dev;
73 unsigned int last_poll_interval;
74 u8 shift;
75 u8 ctrl_reg1;
76 u8 data_ctrl;
77 u8 int_ctrl;
78};
79
80static int kxtj9_i2c_read(struct kxtj9_data *tj9, u8 addr, u8 *data, int len)
81{
82 struct i2c_msg msgs[] = {
83 {
84 .addr = tj9->client->addr,
85 .flags = tj9->client->flags,
86 .len = 1,
87 .buf = &addr,
88 },
89 {
90 .addr = tj9->client->addr,
91 .flags = tj9->client->flags | I2C_M_RD,
92 .len = len,
93 .buf = data,
94 },
95 };
96
97 return i2c_transfer(tj9->client->adapter, msgs, 2);
98}
99
100static void kxtj9_report_acceleration_data(struct kxtj9_data *tj9)
101{
102 s16 acc_data[3]; /* Data bytes from hardware xL, xH, yL, yH, zL, zH */
103 s16 x, y, z;
104 int err;
105
106 err = kxtj9_i2c_read(tj9, XOUT_L, (u8 *)acc_data, 6);
107 if (err < 0)
108 dev_err(&tj9->client->dev, "accelerometer data read failed\n");
109
110 x = le16_to_cpu(acc_data[tj9->pdata.axis_map_x]);
111 y = le16_to_cpu(acc_data[tj9->pdata.axis_map_y]);
112 z = le16_to_cpu(acc_data[tj9->pdata.axis_map_z]);
113
114 x >>= tj9->shift;
115 y >>= tj9->shift;
116 z >>= tj9->shift;
117
118 input_report_abs(tj9->input_dev, ABS_X, tj9->pdata.negate_x ? -x : x);
119 input_report_abs(tj9->input_dev, ABS_Y, tj9->pdata.negate_y ? -y : y);
120 input_report_abs(tj9->input_dev, ABS_Z, tj9->pdata.negate_z ? -z : z);
121 input_sync(tj9->input_dev);
122}
123
124static irqreturn_t kxtj9_isr(int irq, void *dev)
125{
126 struct kxtj9_data *tj9 = dev;
127 int err;
128
129 /* data ready is the only possible interrupt type */
130 kxtj9_report_acceleration_data(tj9);
131
132 err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
133 if (err < 0)
134 dev_err(&tj9->client->dev,
135 "error clearing interrupt status: %d\n", err);
136
137 return IRQ_HANDLED;
138}
139
140static int kxtj9_update_g_range(struct kxtj9_data *tj9, u8 new_g_range)
141{
142 switch (new_g_range) {
143 case KXTJ9_G_2G:
144 tj9->shift = 4;
145 break;
146 case KXTJ9_G_4G:
147 tj9->shift = 3;
148 break;
149 case KXTJ9_G_8G:
150 tj9->shift = 2;
151 break;
152 default:
153 return -EINVAL;
154 }
155
156 tj9->ctrl_reg1 &= 0xe7;
157 tj9->ctrl_reg1 |= new_g_range;
158
159 return 0;
160}
161
162static int kxtj9_update_odr(struct kxtj9_data *tj9, unsigned int poll_interval)
163{
164 int err;
165 int i;
166
167 /* Use the lowest ODR that can support the requested poll interval */
168 for (i = 0; i < ARRAY_SIZE(kxtj9_odr_table); i++) {
169 tj9->data_ctrl = kxtj9_odr_table[i].mask;
170 if (poll_interval < kxtj9_odr_table[i].cutoff)
171 break;
172 }
173
174 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
175 if (err < 0)
176 return err;
177
178 err = i2c_smbus_write_byte_data(tj9->client, DATA_CTRL, tj9->data_ctrl);
179 if (err < 0)
180 return err;
181
182 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
183 if (err < 0)
184 return err;
185
186 return 0;
187}
188
189static int kxtj9_device_power_on(struct kxtj9_data *tj9)
190{
191 if (tj9->pdata.power_on)
192 return tj9->pdata.power_on();
193
194 return 0;
195}
196
197static void kxtj9_device_power_off(struct kxtj9_data *tj9)
198{
199 int err;
200
201 tj9->ctrl_reg1 &= PC1_OFF;
202 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
203 if (err < 0)
204 dev_err(&tj9->client->dev, "soft power off failed\n");
205
206 if (tj9->pdata.power_off)
207 tj9->pdata.power_off();
208}
209
210static int kxtj9_enable(struct kxtj9_data *tj9)
211{
212 int err;
213
214 err = kxtj9_device_power_on(tj9);
215 if (err < 0)
216 return err;
217
218 /* ensure that PC1 is cleared before updating control registers */
219 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
220 if (err < 0)
221 return err;
222
223 /* only write INT_CTRL_REG1 if in irq mode */
224 if (tj9->client->irq) {
225 err = i2c_smbus_write_byte_data(tj9->client,
226 INT_CTRL1, tj9->int_ctrl);
227 if (err < 0)
228 return err;
229 }
230
231 err = kxtj9_update_g_range(tj9, tj9->pdata.g_range);
232 if (err < 0)
233 return err;
234
235 /* turn on outputs */
236 tj9->ctrl_reg1 |= PC1_ON;
237 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
238 if (err < 0)
239 return err;
240
241 err = kxtj9_update_odr(tj9, tj9->last_poll_interval);
242 if (err < 0)
243 return err;
244
245 /* clear initial interrupt if in irq mode */
246 if (tj9->client->irq) {
247 err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
248 if (err < 0) {
249 dev_err(&tj9->client->dev,
250 "error clearing interrupt: %d\n", err);
251 goto fail;
252 }
253 }
254
255 return 0;
256
257fail:
258 kxtj9_device_power_off(tj9);
259 return err;
260}
261
262static void kxtj9_disable(struct kxtj9_data *tj9)
263{
264 kxtj9_device_power_off(tj9);
265}
266
267static int kxtj9_input_open(struct input_dev *input)
268{
269 struct kxtj9_data *tj9 = input_get_drvdata(input);
270
271 return kxtj9_enable(tj9);
272}
273
274static void kxtj9_input_close(struct input_dev *dev)
275{
276 struct kxtj9_data *tj9 = input_get_drvdata(dev);
277
278 kxtj9_disable(tj9);
279}
280
281/*
282 * When IRQ mode is selected, we need to provide an interface to allow the user
283 * to change the output data rate of the part. For consistency, we are using
284 * the set_poll method, which accepts a poll interval in milliseconds, and then
285 * calls update_odr() while passing this value as an argument. In IRQ mode, the
286 * data outputs will not be read AT the requested poll interval, rather, the
287 * lowest ODR that can support the requested interval. The client application
288 * will be responsible for retrieving data from the input node at the desired
289 * interval.
290 */
291
292/* Returns currently selected poll interval (in ms) */
293static ssize_t kxtj9_get_poll(struct device *dev,
294 struct device_attribute *attr, char *buf)
295{
296 struct i2c_client *client = to_i2c_client(dev);
297 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
298
299 return sprintf(buf, "%d\n", tj9->last_poll_interval);
300}
301
302/* Allow users to select a new poll interval (in ms) */
303static ssize_t kxtj9_set_poll(struct device *dev, struct device_attribute *attr,
304 const char *buf, size_t count)
305{
306 struct i2c_client *client = to_i2c_client(dev);
307 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
308 struct input_dev *input_dev = tj9->input_dev;
309 unsigned int interval;
310 int error;
311
312 error = kstrtouint(buf, 10, &interval);
313 if (error < 0)
314 return error;
315
316 /* Lock the device to prevent races with open/close (and itself) */
317 mutex_lock(&input_dev->mutex);
318
319 disable_irq(client->irq);
320
321 /*
322 * Set current interval to the greater of the minimum interval or
323 * the requested interval
324 */
325 tj9->last_poll_interval = max(interval, tj9->pdata.min_interval);
326
327 kxtj9_update_odr(tj9, tj9->last_poll_interval);
328
329 enable_irq(client->irq);
330 mutex_unlock(&input_dev->mutex);
331
332 return count;
333}
334
335static DEVICE_ATTR(poll, S_IRUGO|S_IWUSR, kxtj9_get_poll, kxtj9_set_poll);
336
337static struct attribute *kxtj9_attrs[] = {
338 &dev_attr_poll.attr,
339 NULL
340};
341
342static umode_t kxtj9_attr_is_visible(struct kobject *kobj,
343 struct attribute *attr, int n)
344{
345 struct device *dev = kobj_to_dev(kobj);
346 struct i2c_client *client = to_i2c_client(dev);
347
348 return client->irq ? attr->mode : 0;
349}
350
351static struct attribute_group kxtj9_group = {
352 .attrs = kxtj9_attrs,
353 .is_visible = kxtj9_attr_is_visible,
354};
355__ATTRIBUTE_GROUPS(kxtj9);
356
357static void kxtj9_poll(struct input_dev *input)
358{
359 struct kxtj9_data *tj9 = input_get_drvdata(input);
360 unsigned int poll_interval = input_get_poll_interval(input);
361
362 kxtj9_report_acceleration_data(tj9);
363
364 if (poll_interval != tj9->last_poll_interval) {
365 kxtj9_update_odr(tj9, poll_interval);
366 tj9->last_poll_interval = poll_interval;
367 }
368}
369
370static void kxtj9_platform_exit(void *data)
371{
372 struct kxtj9_data *tj9 = data;
373
374 if (tj9->pdata.exit)
375 tj9->pdata.exit();
376}
377
378static int kxtj9_verify(struct kxtj9_data *tj9)
379{
380 int retval;
381
382 retval = kxtj9_device_power_on(tj9);
383 if (retval < 0)
384 return retval;
385
386 retval = i2c_smbus_read_byte_data(tj9->client, WHO_AM_I);
387 if (retval < 0) {
388 dev_err(&tj9->client->dev, "read err int source\n");
389 goto out;
390 }
391
392 retval = (retval != 0x07 && retval != 0x08) ? -EIO : 0;
393
394out:
395 kxtj9_device_power_off(tj9);
396 return retval;
397}
398
399static int kxtj9_probe(struct i2c_client *client)
400{
401 const struct kxtj9_platform_data *pdata =
402 dev_get_platdata(&client->dev);
403 struct kxtj9_data *tj9;
404 struct input_dev *input_dev;
405 int err;
406
407 if (!i2c_check_functionality(client->adapter,
408 I2C_FUNC_I2C | I2C_FUNC_SMBUS_BYTE_DATA)) {
409 dev_err(&client->dev, "client is not i2c capable\n");
410 return -ENXIO;
411 }
412
413 if (!pdata) {
414 dev_err(&client->dev, "platform data is NULL; exiting\n");
415 return -EINVAL;
416 }
417
418 tj9 = devm_kzalloc(&client->dev, sizeof(*tj9), GFP_KERNEL);
419 if (!tj9) {
420 dev_err(&client->dev,
421 "failed to allocate memory for module data\n");
422 return -ENOMEM;
423 }
424
425 tj9->client = client;
426 tj9->pdata = *pdata;
427
428 if (pdata->init) {
429 err = pdata->init();
430 if (err < 0)
431 return err;
432 }
433
434 err = devm_add_action_or_reset(&client->dev, kxtj9_platform_exit, tj9);
435 if (err)
436 return err;
437
438 err = kxtj9_verify(tj9);
439 if (err < 0) {
440 dev_err(&client->dev, "device not recognized\n");
441 return err;
442 }
443
444 i2c_set_clientdata(client, tj9);
445
446 tj9->ctrl_reg1 = tj9->pdata.res_12bit | tj9->pdata.g_range;
447 tj9->last_poll_interval = tj9->pdata.init_interval;
448
449 input_dev = devm_input_allocate_device(&client->dev);
450 if (!input_dev) {
451 dev_err(&client->dev, "input device allocate failed\n");
452 return -ENOMEM;
453 }
454
455 input_set_drvdata(input_dev, tj9);
456 tj9->input_dev = input_dev;
457
458 input_dev->name = "kxtj9_accel";
459 input_dev->id.bustype = BUS_I2C;
460
461 input_dev->open = kxtj9_input_open;
462 input_dev->close = kxtj9_input_close;
463
464 input_set_abs_params(input_dev, ABS_X, -G_MAX, G_MAX, FUZZ, FLAT);
465 input_set_abs_params(input_dev, ABS_Y, -G_MAX, G_MAX, FUZZ, FLAT);
466 input_set_abs_params(input_dev, ABS_Z, -G_MAX, G_MAX, FUZZ, FLAT);
467
468 if (client->irq <= 0) {
469 err = input_setup_polling(input_dev, kxtj9_poll);
470 if (err)
471 return err;
472 }
473
474 err = input_register_device(input_dev);
475 if (err) {
476 dev_err(&client->dev,
477 "unable to register input polled device %s: %d\n",
478 input_dev->name, err);
479 return err;
480 }
481
482 if (client->irq) {
483 /* If in irq mode, populate INT_CTRL_REG1 and enable DRDY. */
484 tj9->int_ctrl |= KXTJ9_IEN | KXTJ9_IEA | KXTJ9_IEL;
485 tj9->ctrl_reg1 |= DRDYE;
486
487 err = devm_request_threaded_irq(&client->dev, client->irq,
488 NULL, kxtj9_isr,
489 IRQF_TRIGGER_RISING |
490 IRQF_ONESHOT,
491 "kxtj9-irq", tj9);
492 if (err) {
493 dev_err(&client->dev, "request irq failed: %d\n", err);
494 return err;
495 }
496 }
497
498 return 0;
499}
500
501static int kxtj9_suspend(struct device *dev)
502{
503 struct i2c_client *client = to_i2c_client(dev);
504 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
505 struct input_dev *input_dev = tj9->input_dev;
506
507 mutex_lock(&input_dev->mutex);
508
509 if (input_device_enabled(input_dev))
510 kxtj9_disable(tj9);
511
512 mutex_unlock(&input_dev->mutex);
513 return 0;
514}
515
516static int kxtj9_resume(struct device *dev)
517{
518 struct i2c_client *client = to_i2c_client(dev);
519 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
520 struct input_dev *input_dev = tj9->input_dev;
521
522 mutex_lock(&input_dev->mutex);
523
524 if (input_device_enabled(input_dev))
525 kxtj9_enable(tj9);
526
527 mutex_unlock(&input_dev->mutex);
528 return 0;
529}
530
531static DEFINE_SIMPLE_DEV_PM_OPS(kxtj9_pm_ops, kxtj9_suspend, kxtj9_resume);
532
533static const struct i2c_device_id kxtj9_id[] = {
534 { NAME, 0 },
535 { },
536};
537
538MODULE_DEVICE_TABLE(i2c, kxtj9_id);
539
540static struct i2c_driver kxtj9_driver = {
541 .driver = {
542 .name = NAME,
543 .dev_groups = kxtj9_groups,
544 .pm = pm_sleep_ptr(&kxtj9_pm_ops),
545 },
546 .probe = kxtj9_probe,
547 .id_table = kxtj9_id,
548};
549
550module_i2c_driver(kxtj9_driver);
551
552MODULE_DESCRIPTION("KXTJ9 accelerometer driver");
553MODULE_AUTHOR("Chris Hudson <chudson@kionix.com>");
554MODULE_LICENSE("GPL");
1/*
2 * Copyright (C) 2011 Kionix, Inc.
3 * Written by Chris Hudson <chudson@kionix.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 * 02111-1307, USA
18 */
19
20#include <linux/delay.h>
21#include <linux/i2c.h>
22#include <linux/input.h>
23#include <linux/interrupt.h>
24#include <linux/module.h>
25#include <linux/slab.h>
26#include <linux/input/kxtj9.h>
27#include <linux/input-polldev.h>
28
29#define NAME "kxtj9"
30#define G_MAX 8000
31/* OUTPUT REGISTERS */
32#define XOUT_L 0x06
33#define WHO_AM_I 0x0F
34/* CONTROL REGISTERS */
35#define INT_REL 0x1A
36#define CTRL_REG1 0x1B
37#define INT_CTRL1 0x1E
38#define DATA_CTRL 0x21
39/* CONTROL REGISTER 1 BITS */
40#define PC1_OFF 0x7F
41#define PC1_ON (1 << 7)
42/* Data ready funtion enable bit: set during probe if using irq mode */
43#define DRDYE (1 << 5)
44/* INTERRUPT CONTROL REGISTER 1 BITS */
45/* Set these during probe if using irq mode */
46#define KXTJ9_IEL (1 << 3)
47#define KXTJ9_IEA (1 << 4)
48#define KXTJ9_IEN (1 << 5)
49/* INPUT_ABS CONSTANTS */
50#define FUZZ 3
51#define FLAT 3
52/* RESUME STATE INDICES */
53#define RES_DATA_CTRL 0
54#define RES_CTRL_REG1 1
55#define RES_INT_CTRL1 2
56#define RESUME_ENTRIES 3
57
58/*
59 * The following table lists the maximum appropriate poll interval for each
60 * available output data rate.
61 */
62static const struct {
63 unsigned int cutoff;
64 u8 mask;
65} kxtj9_odr_table[] = {
66 { 3, ODR800F },
67 { 5, ODR400F },
68 { 10, ODR200F },
69 { 20, ODR100F },
70 { 40, ODR50F },
71 { 80, ODR25F },
72 { 0, ODR12_5F},
73};
74
75struct kxtj9_data {
76 struct i2c_client *client;
77 struct kxtj9_platform_data pdata;
78 struct input_dev *input_dev;
79#ifdef CONFIG_INPUT_KXTJ9_POLLED_MODE
80 struct input_polled_dev *poll_dev;
81#endif
82 unsigned int last_poll_interval;
83 u8 shift;
84 u8 ctrl_reg1;
85 u8 data_ctrl;
86 u8 int_ctrl;
87};
88
89static int kxtj9_i2c_read(struct kxtj9_data *tj9, u8 addr, u8 *data, int len)
90{
91 struct i2c_msg msgs[] = {
92 {
93 .addr = tj9->client->addr,
94 .flags = tj9->client->flags,
95 .len = 1,
96 .buf = &addr,
97 },
98 {
99 .addr = tj9->client->addr,
100 .flags = tj9->client->flags | I2C_M_RD,
101 .len = len,
102 .buf = data,
103 },
104 };
105
106 return i2c_transfer(tj9->client->adapter, msgs, 2);
107}
108
109static void kxtj9_report_acceleration_data(struct kxtj9_data *tj9)
110{
111 s16 acc_data[3]; /* Data bytes from hardware xL, xH, yL, yH, zL, zH */
112 s16 x, y, z;
113 int err;
114
115 err = kxtj9_i2c_read(tj9, XOUT_L, (u8 *)acc_data, 6);
116 if (err < 0)
117 dev_err(&tj9->client->dev, "accelerometer data read failed\n");
118
119 x = le16_to_cpu(acc_data[tj9->pdata.axis_map_x]) >> tj9->shift;
120 y = le16_to_cpu(acc_data[tj9->pdata.axis_map_y]) >> tj9->shift;
121 z = le16_to_cpu(acc_data[tj9->pdata.axis_map_z]) >> tj9->shift;
122
123 input_report_abs(tj9->input_dev, ABS_X, tj9->pdata.negate_x ? -x : x);
124 input_report_abs(tj9->input_dev, ABS_Y, tj9->pdata.negate_y ? -y : y);
125 input_report_abs(tj9->input_dev, ABS_Z, tj9->pdata.negate_z ? -z : z);
126 input_sync(tj9->input_dev);
127}
128
129static irqreturn_t kxtj9_isr(int irq, void *dev)
130{
131 struct kxtj9_data *tj9 = dev;
132 int err;
133
134 /* data ready is the only possible interrupt type */
135 kxtj9_report_acceleration_data(tj9);
136
137 err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
138 if (err < 0)
139 dev_err(&tj9->client->dev,
140 "error clearing interrupt status: %d\n", err);
141
142 return IRQ_HANDLED;
143}
144
145static int kxtj9_update_g_range(struct kxtj9_data *tj9, u8 new_g_range)
146{
147 switch (new_g_range) {
148 case KXTJ9_G_2G:
149 tj9->shift = 4;
150 break;
151 case KXTJ9_G_4G:
152 tj9->shift = 3;
153 break;
154 case KXTJ9_G_8G:
155 tj9->shift = 2;
156 break;
157 default:
158 return -EINVAL;
159 }
160
161 tj9->ctrl_reg1 &= 0xe7;
162 tj9->ctrl_reg1 |= new_g_range;
163
164 return 0;
165}
166
167static int kxtj9_update_odr(struct kxtj9_data *tj9, unsigned int poll_interval)
168{
169 int err;
170 int i;
171
172 /* Use the lowest ODR that can support the requested poll interval */
173 for (i = 0; i < ARRAY_SIZE(kxtj9_odr_table); i++) {
174 tj9->data_ctrl = kxtj9_odr_table[i].mask;
175 if (poll_interval < kxtj9_odr_table[i].cutoff)
176 break;
177 }
178
179 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
180 if (err < 0)
181 return err;
182
183 err = i2c_smbus_write_byte_data(tj9->client, DATA_CTRL, tj9->data_ctrl);
184 if (err < 0)
185 return err;
186
187 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
188 if (err < 0)
189 return err;
190
191 return 0;
192}
193
194static int kxtj9_device_power_on(struct kxtj9_data *tj9)
195{
196 if (tj9->pdata.power_on)
197 return tj9->pdata.power_on();
198
199 return 0;
200}
201
202static void kxtj9_device_power_off(struct kxtj9_data *tj9)
203{
204 int err;
205
206 tj9->ctrl_reg1 &= PC1_OFF;
207 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
208 if (err < 0)
209 dev_err(&tj9->client->dev, "soft power off failed\n");
210
211 if (tj9->pdata.power_off)
212 tj9->pdata.power_off();
213}
214
215static int kxtj9_enable(struct kxtj9_data *tj9)
216{
217 int err;
218
219 err = kxtj9_device_power_on(tj9);
220 if (err < 0)
221 return err;
222
223 /* ensure that PC1 is cleared before updating control registers */
224 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
225 if (err < 0)
226 return err;
227
228 /* only write INT_CTRL_REG1 if in irq mode */
229 if (tj9->client->irq) {
230 err = i2c_smbus_write_byte_data(tj9->client,
231 INT_CTRL1, tj9->int_ctrl);
232 if (err < 0)
233 return err;
234 }
235
236 err = kxtj9_update_g_range(tj9, tj9->pdata.g_range);
237 if (err < 0)
238 return err;
239
240 /* turn on outputs */
241 tj9->ctrl_reg1 |= PC1_ON;
242 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
243 if (err < 0)
244 return err;
245
246 err = kxtj9_update_odr(tj9, tj9->last_poll_interval);
247 if (err < 0)
248 return err;
249
250 /* clear initial interrupt if in irq mode */
251 if (tj9->client->irq) {
252 err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
253 if (err < 0) {
254 dev_err(&tj9->client->dev,
255 "error clearing interrupt: %d\n", err);
256 goto fail;
257 }
258 }
259
260 return 0;
261
262fail:
263 kxtj9_device_power_off(tj9);
264 return err;
265}
266
267static void kxtj9_disable(struct kxtj9_data *tj9)
268{
269 kxtj9_device_power_off(tj9);
270}
271
272static int kxtj9_input_open(struct input_dev *input)
273{
274 struct kxtj9_data *tj9 = input_get_drvdata(input);
275
276 return kxtj9_enable(tj9);
277}
278
279static void kxtj9_input_close(struct input_dev *dev)
280{
281 struct kxtj9_data *tj9 = input_get_drvdata(dev);
282
283 kxtj9_disable(tj9);
284}
285
286static void __devinit kxtj9_init_input_device(struct kxtj9_data *tj9,
287 struct input_dev *input_dev)
288{
289 __set_bit(EV_ABS, input_dev->evbit);
290 input_set_abs_params(input_dev, ABS_X, -G_MAX, G_MAX, FUZZ, FLAT);
291 input_set_abs_params(input_dev, ABS_Y, -G_MAX, G_MAX, FUZZ, FLAT);
292 input_set_abs_params(input_dev, ABS_Z, -G_MAX, G_MAX, FUZZ, FLAT);
293
294 input_dev->name = "kxtj9_accel";
295 input_dev->id.bustype = BUS_I2C;
296 input_dev->dev.parent = &tj9->client->dev;
297}
298
299static int __devinit kxtj9_setup_input_device(struct kxtj9_data *tj9)
300{
301 struct input_dev *input_dev;
302 int err;
303
304 input_dev = input_allocate_device();
305 if (!input_dev) {
306 dev_err(&tj9->client->dev, "input device allocate failed\n");
307 return -ENOMEM;
308 }
309
310 tj9->input_dev = input_dev;
311
312 input_dev->open = kxtj9_input_open;
313 input_dev->close = kxtj9_input_close;
314 input_set_drvdata(input_dev, tj9);
315
316 kxtj9_init_input_device(tj9, input_dev);
317
318 err = input_register_device(tj9->input_dev);
319 if (err) {
320 dev_err(&tj9->client->dev,
321 "unable to register input polled device %s: %d\n",
322 tj9->input_dev->name, err);
323 input_free_device(tj9->input_dev);
324 return err;
325 }
326
327 return 0;
328}
329
330/*
331 * When IRQ mode is selected, we need to provide an interface to allow the user
332 * to change the output data rate of the part. For consistency, we are using
333 * the set_poll method, which accepts a poll interval in milliseconds, and then
334 * calls update_odr() while passing this value as an argument. In IRQ mode, the
335 * data outputs will not be read AT the requested poll interval, rather, the
336 * lowest ODR that can support the requested interval. The client application
337 * will be responsible for retrieving data from the input node at the desired
338 * interval.
339 */
340
341/* Returns currently selected poll interval (in ms) */
342static ssize_t kxtj9_get_poll(struct device *dev,
343 struct device_attribute *attr, char *buf)
344{
345 struct i2c_client *client = to_i2c_client(dev);
346 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
347
348 return sprintf(buf, "%d\n", tj9->last_poll_interval);
349}
350
351/* Allow users to select a new poll interval (in ms) */
352static ssize_t kxtj9_set_poll(struct device *dev, struct device_attribute *attr,
353 const char *buf, size_t count)
354{
355 struct i2c_client *client = to_i2c_client(dev);
356 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
357 struct input_dev *input_dev = tj9->input_dev;
358 unsigned int interval;
359 int error;
360
361 error = kstrtouint(buf, 10, &interval);
362 if (error < 0)
363 return error;
364
365 /* Lock the device to prevent races with open/close (and itself) */
366 mutex_lock(&input_dev->mutex);
367
368 disable_irq(client->irq);
369
370 /*
371 * Set current interval to the greater of the minimum interval or
372 * the requested interval
373 */
374 tj9->last_poll_interval = max(interval, tj9->pdata.min_interval);
375
376 kxtj9_update_odr(tj9, tj9->last_poll_interval);
377
378 enable_irq(client->irq);
379 mutex_unlock(&input_dev->mutex);
380
381 return count;
382}
383
384static DEVICE_ATTR(poll, S_IRUGO|S_IWUSR, kxtj9_get_poll, kxtj9_set_poll);
385
386static struct attribute *kxtj9_attributes[] = {
387 &dev_attr_poll.attr,
388 NULL
389};
390
391static struct attribute_group kxtj9_attribute_group = {
392 .attrs = kxtj9_attributes
393};
394
395
396#ifdef CONFIG_INPUT_KXTJ9_POLLED_MODE
397static void kxtj9_poll(struct input_polled_dev *dev)
398{
399 struct kxtj9_data *tj9 = dev->private;
400 unsigned int poll_interval = dev->poll_interval;
401
402 kxtj9_report_acceleration_data(tj9);
403
404 if (poll_interval != tj9->last_poll_interval) {
405 kxtj9_update_odr(tj9, poll_interval);
406 tj9->last_poll_interval = poll_interval;
407 }
408}
409
410static void kxtj9_polled_input_open(struct input_polled_dev *dev)
411{
412 struct kxtj9_data *tj9 = dev->private;
413
414 kxtj9_enable(tj9);
415}
416
417static void kxtj9_polled_input_close(struct input_polled_dev *dev)
418{
419 struct kxtj9_data *tj9 = dev->private;
420
421 kxtj9_disable(tj9);
422}
423
424static int __devinit kxtj9_setup_polled_device(struct kxtj9_data *tj9)
425{
426 int err;
427 struct input_polled_dev *poll_dev;
428 poll_dev = input_allocate_polled_device();
429
430 if (!poll_dev) {
431 dev_err(&tj9->client->dev,
432 "Failed to allocate polled device\n");
433 return -ENOMEM;
434 }
435
436 tj9->poll_dev = poll_dev;
437 tj9->input_dev = poll_dev->input;
438
439 poll_dev->private = tj9;
440 poll_dev->poll = kxtj9_poll;
441 poll_dev->open = kxtj9_polled_input_open;
442 poll_dev->close = kxtj9_polled_input_close;
443
444 kxtj9_init_input_device(tj9, poll_dev->input);
445
446 err = input_register_polled_device(poll_dev);
447 if (err) {
448 dev_err(&tj9->client->dev,
449 "Unable to register polled device, err=%d\n", err);
450 input_free_polled_device(poll_dev);
451 return err;
452 }
453
454 return 0;
455}
456
457static void __devexit kxtj9_teardown_polled_device(struct kxtj9_data *tj9)
458{
459 input_unregister_polled_device(tj9->poll_dev);
460 input_free_polled_device(tj9->poll_dev);
461}
462
463#else
464
465static inline int kxtj9_setup_polled_device(struct kxtj9_data *tj9)
466{
467 return -ENOSYS;
468}
469
470static inline void kxtj9_teardown_polled_device(struct kxtj9_data *tj9)
471{
472}
473
474#endif
475
476static int __devinit kxtj9_verify(struct kxtj9_data *tj9)
477{
478 int retval;
479
480 retval = kxtj9_device_power_on(tj9);
481 if (retval < 0)
482 return retval;
483
484 retval = i2c_smbus_read_byte_data(tj9->client, WHO_AM_I);
485 if (retval < 0) {
486 dev_err(&tj9->client->dev, "read err int source\n");
487 goto out;
488 }
489
490 retval = retval != 0x06 ? -EIO : 0;
491
492out:
493 kxtj9_device_power_off(tj9);
494 return retval;
495}
496
497static int __devinit kxtj9_probe(struct i2c_client *client,
498 const struct i2c_device_id *id)
499{
500 const struct kxtj9_platform_data *pdata = client->dev.platform_data;
501 struct kxtj9_data *tj9;
502 int err;
503
504 if (!i2c_check_functionality(client->adapter,
505 I2C_FUNC_I2C | I2C_FUNC_SMBUS_BYTE_DATA)) {
506 dev_err(&client->dev, "client is not i2c capable\n");
507 return -ENXIO;
508 }
509
510 if (!pdata) {
511 dev_err(&client->dev, "platform data is NULL; exiting\n");
512 return -EINVAL;
513 }
514
515 tj9 = kzalloc(sizeof(*tj9), GFP_KERNEL);
516 if (!tj9) {
517 dev_err(&client->dev,
518 "failed to allocate memory for module data\n");
519 return -ENOMEM;
520 }
521
522 tj9->client = client;
523 tj9->pdata = *pdata;
524
525 if (pdata->init) {
526 err = pdata->init();
527 if (err < 0)
528 goto err_free_mem;
529 }
530
531 err = kxtj9_verify(tj9);
532 if (err < 0) {
533 dev_err(&client->dev, "device not recognized\n");
534 goto err_pdata_exit;
535 }
536
537 i2c_set_clientdata(client, tj9);
538
539 tj9->ctrl_reg1 = tj9->pdata.res_12bit | tj9->pdata.g_range;
540 tj9->data_ctrl = tj9->pdata.data_odr_init;
541
542 if (client->irq) {
543 /* If in irq mode, populate INT_CTRL_REG1 and enable DRDY. */
544 tj9->int_ctrl |= KXTJ9_IEN | KXTJ9_IEA | KXTJ9_IEL;
545 tj9->ctrl_reg1 |= DRDYE;
546
547 err = kxtj9_setup_input_device(tj9);
548 if (err)
549 goto err_pdata_exit;
550
551 err = request_threaded_irq(client->irq, NULL, kxtj9_isr,
552 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
553 "kxtj9-irq", tj9);
554 if (err) {
555 dev_err(&client->dev, "request irq failed: %d\n", err);
556 goto err_destroy_input;
557 }
558
559 err = sysfs_create_group(&client->dev.kobj, &kxtj9_attribute_group);
560 if (err) {
561 dev_err(&client->dev, "sysfs create failed: %d\n", err);
562 goto err_free_irq;
563 }
564
565 } else {
566 err = kxtj9_setup_polled_device(tj9);
567 if (err)
568 goto err_pdata_exit;
569 }
570
571 return 0;
572
573err_free_irq:
574 free_irq(client->irq, tj9);
575err_destroy_input:
576 input_unregister_device(tj9->input_dev);
577err_pdata_exit:
578 if (tj9->pdata.exit)
579 tj9->pdata.exit();
580err_free_mem:
581 kfree(tj9);
582 return err;
583}
584
585static int __devexit kxtj9_remove(struct i2c_client *client)
586{
587 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
588
589 if (client->irq) {
590 sysfs_remove_group(&client->dev.kobj, &kxtj9_attribute_group);
591 free_irq(client->irq, tj9);
592 input_unregister_device(tj9->input_dev);
593 } else {
594 kxtj9_teardown_polled_device(tj9);
595 }
596
597 if (tj9->pdata.exit)
598 tj9->pdata.exit();
599
600 kfree(tj9);
601
602 return 0;
603}
604
605#ifdef CONFIG_PM_SLEEP
606static int kxtj9_suspend(struct device *dev)
607{
608 struct i2c_client *client = to_i2c_client(dev);
609 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
610 struct input_dev *input_dev = tj9->input_dev;
611
612 mutex_lock(&input_dev->mutex);
613
614 if (input_dev->users)
615 kxtj9_disable(tj9);
616
617 mutex_unlock(&input_dev->mutex);
618 return 0;
619}
620
621static int kxtj9_resume(struct device *dev)
622{
623 struct i2c_client *client = to_i2c_client(dev);
624 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
625 struct input_dev *input_dev = tj9->input_dev;
626 int retval = 0;
627
628 mutex_lock(&input_dev->mutex);
629
630 if (input_dev->users)
631 kxtj9_enable(tj9);
632
633 mutex_unlock(&input_dev->mutex);
634 return retval;
635}
636#endif
637
638static SIMPLE_DEV_PM_OPS(kxtj9_pm_ops, kxtj9_suspend, kxtj9_resume);
639
640static const struct i2c_device_id kxtj9_id[] = {
641 { NAME, 0 },
642 { },
643};
644
645MODULE_DEVICE_TABLE(i2c, kxtj9_id);
646
647static struct i2c_driver kxtj9_driver = {
648 .driver = {
649 .name = NAME,
650 .owner = THIS_MODULE,
651 .pm = &kxtj9_pm_ops,
652 },
653 .probe = kxtj9_probe,
654 .remove = __devexit_p(kxtj9_remove),
655 .id_table = kxtj9_id,
656};
657
658static int __init kxtj9_init(void)
659{
660 return i2c_add_driver(&kxtj9_driver);
661}
662module_init(kxtj9_init);
663
664static void __exit kxtj9_exit(void)
665{
666 i2c_del_driver(&kxtj9_driver);
667}
668module_exit(kxtj9_exit);
669
670MODULE_DESCRIPTION("KXTJ9 accelerometer driver");
671MODULE_AUTHOR("Chris Hudson <chudson@kionix.com>");
672MODULE_LICENSE("GPL");