1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2011 Kionix, Inc.
4 * Written by Chris Hudson <chudson@kionix.com>
7 #include <linux/delay.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 #include <linux/input-polldev.h>
18 /* OUTPUT REGISTERS */
21 /* CONTROL REGISTERS */
23 #define CTRL_REG1 0x1B
24 #define INT_CTRL1 0x1E
25 #define DATA_CTRL 0x21
26 /* CONTROL REGISTER 1 BITS */
28 #define PC1_ON (1 << 7)
29 /* Data ready funtion enable bit: set during probe if using irq mode */
30 #define DRDYE (1 << 5)
31 /* DATA CONTROL REGISTER BITS */
39 /* INTERRUPT CONTROL REGISTER 1 BITS */
40 /* Set these during probe if using irq mode */
41 #define KXTJ9_IEL (1 << 3)
42 #define KXTJ9_IEA (1 << 4)
43 #define KXTJ9_IEN (1 << 5)
44 /* INPUT_ABS CONSTANTS */
47 /* RESUME STATE INDICES */
48 #define RES_DATA_CTRL 0
49 #define RES_CTRL_REG1 1
50 #define RES_INT_CTRL1 2
51 #define RESUME_ENTRIES 3
54 * The following table lists the maximum appropriate poll interval for each
55 * available output data rate.
60 } kxtj9_odr_table[] = {
71 struct i2c_client *client;
72 struct kxtj9_platform_data pdata;
73 struct input_dev *input_dev;
74 #ifdef CONFIG_INPUT_KXTJ9_POLLED_MODE
75 struct input_polled_dev *poll_dev;
77 unsigned int last_poll_interval;
84 static int kxtj9_i2c_read(struct kxtj9_data *tj9, u8 addr, u8 *data, int len)
86 struct i2c_msg msgs[] = {
88 .addr = tj9->client->addr,
89 .flags = tj9->client->flags,
94 .addr = tj9->client->addr,
95 .flags = tj9->client->flags | I2C_M_RD,
101 return i2c_transfer(tj9->client->adapter, msgs, 2);
104 static void kxtj9_report_acceleration_data(struct kxtj9_data *tj9)
106 s16 acc_data[3]; /* Data bytes from hardware xL, xH, yL, yH, zL, zH */
110 err = kxtj9_i2c_read(tj9, XOUT_L, (u8 *)acc_data, 6);
112 dev_err(&tj9->client->dev, "accelerometer data read failed\n");
114 x = le16_to_cpu(acc_data[tj9->pdata.axis_map_x]);
115 y = le16_to_cpu(acc_data[tj9->pdata.axis_map_y]);
116 z = le16_to_cpu(acc_data[tj9->pdata.axis_map_z]);
122 input_report_abs(tj9->input_dev, ABS_X, tj9->pdata.negate_x ? -x : x);
123 input_report_abs(tj9->input_dev, ABS_Y, tj9->pdata.negate_y ? -y : y);
124 input_report_abs(tj9->input_dev, ABS_Z, tj9->pdata.negate_z ? -z : z);
125 input_sync(tj9->input_dev);
128 static irqreturn_t kxtj9_isr(int irq, void *dev)
130 struct kxtj9_data *tj9 = dev;
133 /* data ready is the only possible interrupt type */
134 kxtj9_report_acceleration_data(tj9);
136 err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
138 dev_err(&tj9->client->dev,
139 "error clearing interrupt status: %d\n", err);
144 static int kxtj9_update_g_range(struct kxtj9_data *tj9, u8 new_g_range)
146 switch (new_g_range) {
160 tj9->ctrl_reg1 &= 0xe7;
161 tj9->ctrl_reg1 |= new_g_range;
166 static int kxtj9_update_odr(struct kxtj9_data *tj9, unsigned int poll_interval)
171 /* Use the lowest ODR that can support the requested poll interval */
172 for (i = 0; i < ARRAY_SIZE(kxtj9_odr_table); i++) {
173 tj9->data_ctrl = kxtj9_odr_table[i].mask;
174 if (poll_interval < kxtj9_odr_table[i].cutoff)
178 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
182 err = i2c_smbus_write_byte_data(tj9->client, DATA_CTRL, tj9->data_ctrl);
186 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
193 static int kxtj9_device_power_on(struct kxtj9_data *tj9)
195 if (tj9->pdata.power_on)
196 return tj9->pdata.power_on();
201 static void kxtj9_device_power_off(struct kxtj9_data *tj9)
205 tj9->ctrl_reg1 &= PC1_OFF;
206 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
208 dev_err(&tj9->client->dev, "soft power off failed\n");
210 if (tj9->pdata.power_off)
211 tj9->pdata.power_off();
214 static int kxtj9_enable(struct kxtj9_data *tj9)
218 err = kxtj9_device_power_on(tj9);
222 /* ensure that PC1 is cleared before updating control registers */
223 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, 0);
227 /* only write INT_CTRL_REG1 if in irq mode */
228 if (tj9->client->irq) {
229 err = i2c_smbus_write_byte_data(tj9->client,
230 INT_CTRL1, tj9->int_ctrl);
235 err = kxtj9_update_g_range(tj9, tj9->pdata.g_range);
239 /* turn on outputs */
240 tj9->ctrl_reg1 |= PC1_ON;
241 err = i2c_smbus_write_byte_data(tj9->client, CTRL_REG1, tj9->ctrl_reg1);
245 err = kxtj9_update_odr(tj9, tj9->last_poll_interval);
249 /* clear initial interrupt if in irq mode */
250 if (tj9->client->irq) {
251 err = i2c_smbus_read_byte_data(tj9->client, INT_REL);
253 dev_err(&tj9->client->dev,
254 "error clearing interrupt: %d\n", err);
262 kxtj9_device_power_off(tj9);
266 static void kxtj9_disable(struct kxtj9_data *tj9)
268 kxtj9_device_power_off(tj9);
271 static int kxtj9_input_open(struct input_dev *input)
273 struct kxtj9_data *tj9 = input_get_drvdata(input);
275 return kxtj9_enable(tj9);
278 static void kxtj9_input_close(struct input_dev *dev)
280 struct kxtj9_data *tj9 = input_get_drvdata(dev);
285 static void kxtj9_init_input_device(struct kxtj9_data *tj9,
286 struct input_dev *input_dev)
288 __set_bit(EV_ABS, input_dev->evbit);
289 input_set_abs_params(input_dev, ABS_X, -G_MAX, G_MAX, FUZZ, FLAT);
290 input_set_abs_params(input_dev, ABS_Y, -G_MAX, G_MAX, FUZZ, FLAT);
291 input_set_abs_params(input_dev, ABS_Z, -G_MAX, G_MAX, FUZZ, FLAT);
293 input_dev->name = "kxtj9_accel";
294 input_dev->id.bustype = BUS_I2C;
295 input_dev->dev.parent = &tj9->client->dev;
298 static int kxtj9_setup_input_device(struct kxtj9_data *tj9)
300 struct input_dev *input_dev;
303 input_dev = input_allocate_device();
305 dev_err(&tj9->client->dev, "input device allocate failed\n");
309 tj9->input_dev = input_dev;
311 input_dev->open = kxtj9_input_open;
312 input_dev->close = kxtj9_input_close;
313 input_set_drvdata(input_dev, tj9);
315 kxtj9_init_input_device(tj9, input_dev);
317 err = input_register_device(tj9->input_dev);
319 dev_err(&tj9->client->dev,
320 "unable to register input polled device %s: %d\n",
321 tj9->input_dev->name, err);
322 input_free_device(tj9->input_dev);
330 * When IRQ mode is selected, we need to provide an interface to allow the user
331 * to change the output data rate of the part. For consistency, we are using
332 * the set_poll method, which accepts a poll interval in milliseconds, and then
333 * calls update_odr() while passing this value as an argument. In IRQ mode, the
334 * data outputs will not be read AT the requested poll interval, rather, the
335 * lowest ODR that can support the requested interval. The client application
336 * will be responsible for retrieving data from the input node at the desired
340 /* Returns currently selected poll interval (in ms) */
341 static ssize_t kxtj9_get_poll(struct device *dev,
342 struct device_attribute *attr, char *buf)
344 struct i2c_client *client = to_i2c_client(dev);
345 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
347 return sprintf(buf, "%d\n", tj9->last_poll_interval);
350 /* Allow users to select a new poll interval (in ms) */
351 static ssize_t kxtj9_set_poll(struct device *dev, struct device_attribute *attr,
352 const char *buf, size_t count)
354 struct i2c_client *client = to_i2c_client(dev);
355 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
356 struct input_dev *input_dev = tj9->input_dev;
357 unsigned int interval;
360 error = kstrtouint(buf, 10, &interval);
364 /* Lock the device to prevent races with open/close (and itself) */
365 mutex_lock(&input_dev->mutex);
367 disable_irq(client->irq);
370 * Set current interval to the greater of the minimum interval or
371 * the requested interval
373 tj9->last_poll_interval = max(interval, tj9->pdata.min_interval);
375 kxtj9_update_odr(tj9, tj9->last_poll_interval);
377 enable_irq(client->irq);
378 mutex_unlock(&input_dev->mutex);
383 static DEVICE_ATTR(poll, S_IRUGO|S_IWUSR, kxtj9_get_poll, kxtj9_set_poll);
385 static struct attribute *kxtj9_attributes[] = {
390 static struct attribute_group kxtj9_attribute_group = {
391 .attrs = kxtj9_attributes
395 #ifdef CONFIG_INPUT_KXTJ9_POLLED_MODE
396 static void kxtj9_poll(struct input_polled_dev *dev)
398 struct kxtj9_data *tj9 = dev->private;
399 unsigned int poll_interval = dev->poll_interval;
401 kxtj9_report_acceleration_data(tj9);
403 if (poll_interval != tj9->last_poll_interval) {
404 kxtj9_update_odr(tj9, poll_interval);
405 tj9->last_poll_interval = poll_interval;
409 static void kxtj9_polled_input_open(struct input_polled_dev *dev)
411 struct kxtj9_data *tj9 = dev->private;
416 static void kxtj9_polled_input_close(struct input_polled_dev *dev)
418 struct kxtj9_data *tj9 = dev->private;
423 static int kxtj9_setup_polled_device(struct kxtj9_data *tj9)
426 struct input_polled_dev *poll_dev;
427 poll_dev = input_allocate_polled_device();
430 dev_err(&tj9->client->dev,
431 "Failed to allocate polled device\n");
435 tj9->poll_dev = poll_dev;
436 tj9->input_dev = poll_dev->input;
438 poll_dev->private = tj9;
439 poll_dev->poll = kxtj9_poll;
440 poll_dev->open = kxtj9_polled_input_open;
441 poll_dev->close = kxtj9_polled_input_close;
443 kxtj9_init_input_device(tj9, poll_dev->input);
445 err = input_register_polled_device(poll_dev);
447 dev_err(&tj9->client->dev,
448 "Unable to register polled device, err=%d\n", err);
449 input_free_polled_device(poll_dev);
456 static void kxtj9_teardown_polled_device(struct kxtj9_data *tj9)
458 input_unregister_polled_device(tj9->poll_dev);
459 input_free_polled_device(tj9->poll_dev);
464 static inline int kxtj9_setup_polled_device(struct kxtj9_data *tj9)
469 static inline void kxtj9_teardown_polled_device(struct kxtj9_data *tj9)
475 static int kxtj9_verify(struct kxtj9_data *tj9)
479 retval = kxtj9_device_power_on(tj9);
483 retval = i2c_smbus_read_byte_data(tj9->client, WHO_AM_I);
485 dev_err(&tj9->client->dev, "read err int source\n");
489 retval = (retval != 0x07 && retval != 0x08) ? -EIO : 0;
492 kxtj9_device_power_off(tj9);
496 static int kxtj9_probe(struct i2c_client *client,
497 const struct i2c_device_id *id)
499 const struct kxtj9_platform_data *pdata =
500 dev_get_platdata(&client->dev);
501 struct kxtj9_data *tj9;
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");
511 dev_err(&client->dev, "platform data is NULL; exiting\n");
515 tj9 = kzalloc(sizeof(*tj9), GFP_KERNEL);
517 dev_err(&client->dev,
518 "failed to allocate memory for module data\n");
522 tj9->client = client;
531 err = kxtj9_verify(tj9);
533 dev_err(&client->dev, "device not recognized\n");
537 i2c_set_clientdata(client, tj9);
539 tj9->ctrl_reg1 = tj9->pdata.res_12bit | tj9->pdata.g_range;
540 tj9->last_poll_interval = tj9->pdata.init_interval;
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;
547 err = kxtj9_setup_input_device(tj9);
551 err = request_threaded_irq(client->irq, NULL, kxtj9_isr,
552 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
555 dev_err(&client->dev, "request irq failed: %d\n", err);
556 goto err_destroy_input;
559 err = sysfs_create_group(&client->dev.kobj, &kxtj9_attribute_group);
561 dev_err(&client->dev, "sysfs create failed: %d\n", err);
566 err = kxtj9_setup_polled_device(tj9);
574 free_irq(client->irq, tj9);
576 input_unregister_device(tj9->input_dev);
585 static int kxtj9_remove(struct i2c_client *client)
587 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
590 sysfs_remove_group(&client->dev.kobj, &kxtj9_attribute_group);
591 free_irq(client->irq, tj9);
592 input_unregister_device(tj9->input_dev);
594 kxtj9_teardown_polled_device(tj9);
605 static int __maybe_unused kxtj9_suspend(struct device *dev)
607 struct i2c_client *client = to_i2c_client(dev);
608 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
609 struct input_dev *input_dev = tj9->input_dev;
611 mutex_lock(&input_dev->mutex);
613 if (input_dev->users)
616 mutex_unlock(&input_dev->mutex);
620 static int __maybe_unused kxtj9_resume(struct device *dev)
622 struct i2c_client *client = to_i2c_client(dev);
623 struct kxtj9_data *tj9 = i2c_get_clientdata(client);
624 struct input_dev *input_dev = tj9->input_dev;
626 mutex_lock(&input_dev->mutex);
628 if (input_dev->users)
631 mutex_unlock(&input_dev->mutex);
635 static SIMPLE_DEV_PM_OPS(kxtj9_pm_ops, kxtj9_suspend, kxtj9_resume);
637 static const struct i2c_device_id kxtj9_id[] = {
642 MODULE_DEVICE_TABLE(i2c, kxtj9_id);
644 static struct i2c_driver kxtj9_driver = {
649 .probe = kxtj9_probe,
650 .remove = kxtj9_remove,
651 .id_table = kxtj9_id,
654 module_i2c_driver(kxtj9_driver);
656 MODULE_DESCRIPTION("KXTJ9 accelerometer driver");
657 MODULE_AUTHOR("Chris Hudson <chudson@kionix.com>");
658 MODULE_LICENSE("GPL");