x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / input / misc / kxtj9.c
bloba993b67a8a5b34a956272f2007c26d1c1da85022
1 /*
2 * Copyright (C) 2011 Kionix, Inc.
3 * Written by Chris Hudson <chudson@kionix.com>
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.
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.
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
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>
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 /* DATA CONTROL REGISTER BITS */
45 #define ODR12_5F 0
46 #define ODR25F 1
47 #define ODR50F 2
48 #define ODR100F 3
49 #define ODR200F 4
50 #define ODR400F 5
51 #define ODR800F 6
52 /* INTERRUPT CONTROL REGISTER 1 BITS */
53 /* Set these during probe if using irq mode */
54 #define KXTJ9_IEL (1 << 3)
55 #define KXTJ9_IEA (1 << 4)
56 #define KXTJ9_IEN (1 << 5)
57 /* INPUT_ABS CONSTANTS */
58 #define FUZZ 3
59 #define FLAT 3
60 /* RESUME STATE INDICES */
61 #define RES_DATA_CTRL 0
62 #define RES_CTRL_REG1 1
63 #define RES_INT_CTRL1 2
64 #define RESUME_ENTRIES 3
67 * The following table lists the maximum appropriate poll interval for each
68 * available output data rate.
70 static const struct {
71 unsigned int cutoff;
72 u8 mask;
73 } kxtj9_odr_table[] = {
74 { 3, ODR800F },
75 { 5, ODR400F },
76 { 10, ODR200F },
77 { 20, ODR100F },
78 { 40, ODR50F },
79 { 80, ODR25F },
80 { 0, ODR12_5F},
83 struct kxtj9_data {
84 struct i2c_client *client;
85 struct kxtj9_platform_data pdata;
86 struct input_dev *input_dev;
87 #ifdef CONFIG_INPUT_KXTJ9_POLLED_MODE
88 struct input_polled_dev *poll_dev;
89 #endif
90 unsigned int last_poll_interval;
91 u8 shift;
92 u8 ctrl_reg1;
93 u8 data_ctrl;
94 u8 int_ctrl;
97 static int kxtj9_i2c_read(struct kxtj9_data *tj9, u8 addr, u8 *data, int len)
99 struct i2c_msg msgs[] = {
101 .addr = tj9->client->addr,
102 .flags = tj9->client->flags,
103 .len = 1,
104 .buf = &addr,
107 .addr = tj9->client->addr,
108 .flags = tj9->client->flags | I2C_M_RD,
109 .len = len,
110 .buf = data,
114 return i2c_transfer(tj9->client->adapter, msgs, 2);
117 static void kxtj9_report_acceleration_data(struct kxtj9_data *tj9)
119 s16 acc_data[3]; /* Data bytes from hardware xL, xH, yL, yH, zL, zH */
120 s16 x, y, z;
121 int err;
123 err = kxtj9_i2c_read(tj9, XOUT_L, (u8 *)acc_data, 6);
124 if (err < 0)
125 dev_err(&tj9->client->dev, "accelerometer data read failed\n");
127 x = le16_to_cpu(acc_data[tj9->pdata.axis_map_x]);
128 y = le16_to_cpu(acc_data[tj9->pdata.axis_map_y]);
129 z = le16_to_cpu(acc_data[tj9->pdata.axis_map_z]);
131 x >>= tj9->shift;
132 y >>= tj9->shift;
133 z >>= tj9->shift;
135 input_report_abs(tj9->input_dev, ABS_X, tj9->pdata.negate_x ? -x : x);
136 input_report_abs(tj9->input_dev, ABS_Y, tj9->pdata.negate_y ? -y : y);
137 input_report_abs(tj9->input_dev, ABS_Z, tj9->pdata.negate_z ? -z : z);
138 input_sync(tj9->input_dev);
141 static irqreturn_t kxtj9_isr(int irq, void *dev)
143 struct kxtj9_data *tj9 = dev;
144 int err;
146 /* data ready is the only possible interrupt type */
147 kxtj9_report_acceleration_data(tj9);
149 err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
150 if (err < 0)
151 dev_err(&tj9->client->dev,
152 "error clearing interrupt status: %d\n", err);
154 return IRQ_HANDLED;
157 static int kxtj9_update_g_range(struct kxtj9_data *tj9, u8 new_g_range)
159 switch (new_g_range) {
160 case KXTJ9_G_2G:
161 tj9->shift = 4;
162 break;
163 case KXTJ9_G_4G:
164 tj9->shift = 3;
165 break;
166 case KXTJ9_G_8G:
167 tj9->shift = 2;
168 break;
169 default:
170 return -EINVAL;
173 tj9->ctrl_reg1 &= 0xe7;
174 tj9->ctrl_reg1 |= new_g_range;
176 return 0;
179 static int kxtj9_update_odr(struct kxtj9_data *tj9, unsigned int poll_interval)
181 int err;
182 int i;
184 /* Use the lowest ODR that can support the requested poll interval */
185 for (i = 0; i < ARRAY_SIZE(kxtj9_odr_table); i++) {
186 tj9->data_ctrl = kxtj9_odr_table[i].mask;
187 if (poll_interval < kxtj9_odr_table[i].cutoff)
188 break;
191 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
192 if (err < 0)
193 return err;
195 err = i2c_smbus_write_byte_data(tj9->client, DATA_CTRL, tj9->data_ctrl);
196 if (err < 0)
197 return err;
199 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
200 if (err < 0)
201 return err;
203 return 0;
206 static int kxtj9_device_power_on(struct kxtj9_data *tj9)
208 if (tj9->pdata.power_on)
209 return tj9->pdata.power_on();
211 return 0;
214 static void kxtj9_device_power_off(struct kxtj9_data *tj9)
216 int err;
218 tj9->ctrl_reg1 &= PC1_OFF;
219 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
220 if (err < 0)
221 dev_err(&tj9->client->dev, "soft power off failed\n");
223 if (tj9->pdata.power_off)
224 tj9->pdata.power_off();
227 static int kxtj9_enable(struct kxtj9_data *tj9)
229 int err;
231 err = kxtj9_device_power_on(tj9);
232 if (err < 0)
233 return err;
235 /* ensure that PC1 is cleared before updating control registers */
236 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
237 if (err < 0)
238 return err;
240 /* only write INT_CTRL_REG1 if in irq mode */
241 if (tj9->client->irq) {
242 err = i2c_smbus_write_byte_data(tj9->client,
243 INT_CTRL1, tj9->int_ctrl);
244 if (err < 0)
245 return err;
248 err = kxtj9_update_g_range(tj9, tj9->pdata.g_range);
249 if (err < 0)
250 return err;
252 /* turn on outputs */
253 tj9->ctrl_reg1 |= PC1_ON;
254 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
255 if (err < 0)
256 return err;
258 err = kxtj9_update_odr(tj9, tj9->last_poll_interval);
259 if (err < 0)
260 return err;
262 /* clear initial interrupt if in irq mode */
263 if (tj9->client->irq) {
264 err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
265 if (err < 0) {
266 dev_err(&tj9->client->dev,
267 "error clearing interrupt: %d\n", err);
268 goto fail;
272 return 0;
274 fail:
275 kxtj9_device_power_off(tj9);
276 return err;
279 static void kxtj9_disable(struct kxtj9_data *tj9)
281 kxtj9_device_power_off(tj9);
284 static int kxtj9_input_open(struct input_dev *input)
286 struct kxtj9_data *tj9 = input_get_drvdata(input);
288 return kxtj9_enable(tj9);
291 static void kxtj9_input_close(struct input_dev *dev)
293 struct kxtj9_data *tj9 = input_get_drvdata(dev);
295 kxtj9_disable(tj9);
298 static void kxtj9_init_input_device(struct kxtj9_data *tj9,
299 struct input_dev *input_dev)
301 __set_bit(EV_ABS, input_dev->evbit);
302 input_set_abs_params(input_dev, ABS_X, -G_MAX, G_MAX, FUZZ, FLAT);
303 input_set_abs_params(input_dev, ABS_Y, -G_MAX, G_MAX, FUZZ, FLAT);
304 input_set_abs_params(input_dev, ABS_Z, -G_MAX, G_MAX, FUZZ, FLAT);
306 input_dev->name = "kxtj9_accel";
307 input_dev->id.bustype = BUS_I2C;
308 input_dev->dev.parent = &tj9->client->dev;
311 static int kxtj9_setup_input_device(struct kxtj9_data *tj9)
313 struct input_dev *input_dev;
314 int err;
316 input_dev = input_allocate_device();
317 if (!input_dev) {
318 dev_err(&tj9->client->dev, "input device allocate failed\n");
319 return -ENOMEM;
322 tj9->input_dev = input_dev;
324 input_dev->open = kxtj9_input_open;
325 input_dev->close = kxtj9_input_close;
326 input_set_drvdata(input_dev, tj9);
328 kxtj9_init_input_device(tj9, input_dev);
330 err = input_register_device(tj9->input_dev);
331 if (err) {
332 dev_err(&tj9->client->dev,
333 "unable to register input polled device %s: %d\n",
334 tj9->input_dev->name, err);
335 input_free_device(tj9->input_dev);
336 return err;
339 return 0;
343 * When IRQ mode is selected, we need to provide an interface to allow the user
344 * to change the output data rate of the part. For consistency, we are using
345 * the set_poll method, which accepts a poll interval in milliseconds, and then
346 * calls update_odr() while passing this value as an argument. In IRQ mode, the
347 * data outputs will not be read AT the requested poll interval, rather, the
348 * lowest ODR that can support the requested interval. The client application
349 * will be responsible for retrieving data from the input node at the desired
350 * interval.
353 /* Returns currently selected poll interval (in ms) */
354 static ssize_t kxtj9_get_poll(struct device *dev,
355 struct device_attribute *attr, char *buf)
357 struct i2c_client *client = to_i2c_client(dev);
358 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
360 return sprintf(buf, "%d\n", tj9->last_poll_interval);
363 /* Allow users to select a new poll interval (in ms) */
364 static ssize_t kxtj9_set_poll(struct device *dev, struct device_attribute *attr,
365 const char *buf, size_t count)
367 struct i2c_client *client = to_i2c_client(dev);
368 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
369 struct input_dev *input_dev = tj9->input_dev;
370 unsigned int interval;
371 int error;
373 error = kstrtouint(buf, 10, &interval);
374 if (error < 0)
375 return error;
377 /* Lock the device to prevent races with open/close (and itself) */
378 mutex_lock(&input_dev->mutex);
380 disable_irq(client->irq);
383 * Set current interval to the greater of the minimum interval or
384 * the requested interval
386 tj9->last_poll_interval = max(interval, tj9->pdata.min_interval);
388 kxtj9_update_odr(tj9, tj9->last_poll_interval);
390 enable_irq(client->irq);
391 mutex_unlock(&input_dev->mutex);
393 return count;
396 static DEVICE_ATTR(poll, S_IRUGO|S_IWUSR, kxtj9_get_poll, kxtj9_set_poll);
398 static struct attribute *kxtj9_attributes[] = {
399 &dev_attr_poll.attr,
400 NULL
403 static struct attribute_group kxtj9_attribute_group = {
404 .attrs = kxtj9_attributes
408 #ifdef CONFIG_INPUT_KXTJ9_POLLED_MODE
409 static void kxtj9_poll(struct input_polled_dev *dev)
411 struct kxtj9_data *tj9 = dev->private;
412 unsigned int poll_interval = dev->poll_interval;
414 kxtj9_report_acceleration_data(tj9);
416 if (poll_interval != tj9->last_poll_interval) {
417 kxtj9_update_odr(tj9, poll_interval);
418 tj9->last_poll_interval = poll_interval;
422 static void kxtj9_polled_input_open(struct input_polled_dev *dev)
424 struct kxtj9_data *tj9 = dev->private;
426 kxtj9_enable(tj9);
429 static void kxtj9_polled_input_close(struct input_polled_dev *dev)
431 struct kxtj9_data *tj9 = dev->private;
433 kxtj9_disable(tj9);
436 static int kxtj9_setup_polled_device(struct kxtj9_data *tj9)
438 int err;
439 struct input_polled_dev *poll_dev;
440 poll_dev = input_allocate_polled_device();
442 if (!poll_dev) {
443 dev_err(&tj9->client->dev,
444 "Failed to allocate polled device\n");
445 return -ENOMEM;
448 tj9->poll_dev = poll_dev;
449 tj9->input_dev = poll_dev->input;
451 poll_dev->private = tj9;
452 poll_dev->poll = kxtj9_poll;
453 poll_dev->open = kxtj9_polled_input_open;
454 poll_dev->close = kxtj9_polled_input_close;
456 kxtj9_init_input_device(tj9, poll_dev->input);
458 err = input_register_polled_device(poll_dev);
459 if (err) {
460 dev_err(&tj9->client->dev,
461 "Unable to register polled device, err=%d\n", err);
462 input_free_polled_device(poll_dev);
463 return err;
466 return 0;
469 static void kxtj9_teardown_polled_device(struct kxtj9_data *tj9)
471 input_unregister_polled_device(tj9->poll_dev);
472 input_free_polled_device(tj9->poll_dev);
475 #else
477 static inline int kxtj9_setup_polled_device(struct kxtj9_data *tj9)
479 return -ENOSYS;
482 static inline void kxtj9_teardown_polled_device(struct kxtj9_data *tj9)
486 #endif
488 static int kxtj9_verify(struct kxtj9_data *tj9)
490 int retval;
492 retval = kxtj9_device_power_on(tj9);
493 if (retval < 0)
494 return retval;
496 retval = i2c_smbus_read_byte_data(tj9->client, WHO_AM_I);
497 if (retval < 0) {
498 dev_err(&tj9->client->dev, "read err int source\n");
499 goto out;
502 retval = (retval != 0x07 && retval != 0x08) ? -EIO : 0;
504 out:
505 kxtj9_device_power_off(tj9);
506 return retval;
509 static int kxtj9_probe(struct i2c_client *client,
510 const struct i2c_device_id *id)
512 const struct kxtj9_platform_data *pdata = client->dev.platform_data;
513 struct kxtj9_data *tj9;
514 int err;
516 if (!i2c_check_functionality(client->adapter,
517 I2C_FUNC_I2C | I2C_FUNC_SMBUS_BYTE_DATA)) {
518 dev_err(&client->dev, "client is not i2c capable\n");
519 return -ENXIO;
522 if (!pdata) {
523 dev_err(&client->dev, "platform data is NULL; exiting\n");
524 return -EINVAL;
527 tj9 = kzalloc(sizeof(*tj9), GFP_KERNEL);
528 if (!tj9) {
529 dev_err(&client->dev,
530 "failed to allocate memory for module data\n");
531 return -ENOMEM;
534 tj9->client = client;
535 tj9->pdata = *pdata;
537 if (pdata->init) {
538 err = pdata->init();
539 if (err < 0)
540 goto err_free_mem;
543 err = kxtj9_verify(tj9);
544 if (err < 0) {
545 dev_err(&client->dev, "device not recognized\n");
546 goto err_pdata_exit;
549 i2c_set_clientdata(client, tj9);
551 tj9->ctrl_reg1 = tj9->pdata.res_12bit | tj9->pdata.g_range;
552 tj9->last_poll_interval = tj9->pdata.init_interval;
554 if (client->irq) {
555 /* If in irq mode, populate INT_CTRL_REG1 and enable DRDY. */
556 tj9->int_ctrl |= KXTJ9_IEN | KXTJ9_IEA | KXTJ9_IEL;
557 tj9->ctrl_reg1 |= DRDYE;
559 err = kxtj9_setup_input_device(tj9);
560 if (err)
561 goto err_pdata_exit;
563 err = request_threaded_irq(client->irq, NULL, kxtj9_isr,
564 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
565 "kxtj9-irq", tj9);
566 if (err) {
567 dev_err(&client->dev, "request irq failed: %d\n", err);
568 goto err_destroy_input;
571 err = sysfs_create_group(&client->dev.kobj, &kxtj9_attribute_group);
572 if (err) {
573 dev_err(&client->dev, "sysfs create failed: %d\n", err);
574 goto err_free_irq;
577 } else {
578 err = kxtj9_setup_polled_device(tj9);
579 if (err)
580 goto err_pdata_exit;
583 return 0;
585 err_free_irq:
586 free_irq(client->irq, tj9);
587 err_destroy_input:
588 input_unregister_device(tj9->input_dev);
589 err_pdata_exit:
590 if (tj9->pdata.exit)
591 tj9->pdata.exit();
592 err_free_mem:
593 kfree(tj9);
594 return err;
597 static int kxtj9_remove(struct i2c_client *client)
599 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
601 if (client->irq) {
602 sysfs_remove_group(&client->dev.kobj, &kxtj9_attribute_group);
603 free_irq(client->irq, tj9);
604 input_unregister_device(tj9->input_dev);
605 } else {
606 kxtj9_teardown_polled_device(tj9);
609 if (tj9->pdata.exit)
610 tj9->pdata.exit();
612 kfree(tj9);
614 return 0;
617 #ifdef CONFIG_PM_SLEEP
618 static int kxtj9_suspend(struct device *dev)
620 struct i2c_client *client = to_i2c_client(dev);
621 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
622 struct input_dev *input_dev = tj9->input_dev;
624 mutex_lock(&input_dev->mutex);
626 if (input_dev->users)
627 kxtj9_disable(tj9);
629 mutex_unlock(&input_dev->mutex);
630 return 0;
633 static int kxtj9_resume(struct device *dev)
635 struct i2c_client *client = to_i2c_client(dev);
636 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
637 struct input_dev *input_dev = tj9->input_dev;
638 int retval = 0;
640 mutex_lock(&input_dev->mutex);
642 if (input_dev->users)
643 kxtj9_enable(tj9);
645 mutex_unlock(&input_dev->mutex);
646 return retval;
648 #endif
650 static SIMPLE_DEV_PM_OPS(kxtj9_pm_ops, kxtj9_suspend, kxtj9_resume);
652 static const struct i2c_device_id kxtj9_id[] = {
653 { NAME, 0 },
654 { },
657 MODULE_DEVICE_TABLE(i2c, kxtj9_id);
659 static struct i2c_driver kxtj9_driver = {
660 .driver = {
661 .name = NAME,
662 .owner = THIS_MODULE,
663 .pm = &kxtj9_pm_ops,
665 .probe = kxtj9_probe,
666 .remove = kxtj9_remove,
667 .id_table = kxtj9_id,
670 module_i2c_driver(kxtj9_driver);
672 MODULE_DESCRIPTION("KXTJ9 accelerometer driver");
673 MODULE_AUTHOR("Chris Hudson <chudson@kionix.com>");
674 MODULE_LICENSE("GPL");