2 * atlas-ph-sensor.c - Support for Atlas Scientific OEM pH-SM sensor
4 * Copyright (C) 2015 Matt Ranostay <mranostay@gmail.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/delay.h>
21 #include <linux/mutex.h>
22 #include <linux/err.h>
23 #include <linux/irq.h>
24 #include <linux/irq_work.h>
25 #include <linux/gpio.h>
26 #include <linux/i2c.h>
27 #include <linux/regmap.h>
28 #include <linux/iio/iio.h>
29 #include <linux/iio/buffer.h>
30 #include <linux/iio/trigger.h>
31 #include <linux/iio/trigger_consumer.h>
32 #include <linux/iio/triggered_buffer.h>
33 #include <linux/pm_runtime.h>
35 #define ATLAS_REGMAP_NAME "atlas_ph_regmap"
36 #define ATLAS_DRV_NAME "atlas_ph"
38 #define ATLAS_REG_DEV_TYPE 0x00
39 #define ATLAS_REG_DEV_VERSION 0x01
41 #define ATLAS_REG_INT_CONTROL 0x04
42 #define ATLAS_REG_INT_CONTROL_EN BIT(3)
44 #define ATLAS_REG_PWR_CONTROL 0x06
46 #define ATLAS_REG_CALIB_STATUS 0x0d
47 #define ATLAS_REG_CALIB_STATUS_MASK 0x07
48 #define ATLAS_REG_CALIB_STATUS_LOW BIT(0)
49 #define ATLAS_REG_CALIB_STATUS_MID BIT(1)
50 #define ATLAS_REG_CALIB_STATUS_HIGH BIT(2)
52 #define ATLAS_REG_TEMP_DATA 0x0e
53 #define ATLAS_REG_PH_DATA 0x16
55 #define ATLAS_PH_INT_TIME_IN_US 450000
58 struct i2c_client *client;
59 struct iio_trigger *trig;
60 struct regmap *regmap;
63 __be32 buffer[4]; /* 32-bit pH data + 32-bit pad + 64-bit timestamp */
66 static const struct regmap_range atlas_volatile_ranges[] = {
67 regmap_reg_range(ATLAS_REG_INT_CONTROL, ATLAS_REG_INT_CONTROL),
68 regmap_reg_range(ATLAS_REG_CALIB_STATUS, ATLAS_REG_CALIB_STATUS),
69 regmap_reg_range(ATLAS_REG_TEMP_DATA, ATLAS_REG_TEMP_DATA + 4),
70 regmap_reg_range(ATLAS_REG_PH_DATA, ATLAS_REG_PH_DATA + 4),
73 static const struct regmap_access_table atlas_volatile_table = {
74 .yes_ranges = atlas_volatile_ranges,
75 .n_yes_ranges = ARRAY_SIZE(atlas_volatile_ranges),
78 static const struct regmap_config atlas_regmap_config = {
79 .name = ATLAS_REGMAP_NAME,
84 .volatile_table = &atlas_volatile_table,
85 .max_register = ATLAS_REG_PH_DATA + 4,
86 .cache_type = REGCACHE_FLAT,
89 static const struct iio_chan_spec atlas_channels[] = {
93 BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
102 IIO_CHAN_SOFT_TIMESTAMP(1),
105 .address = ATLAS_REG_TEMP_DATA,
106 .info_mask_separate =
107 BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
113 static int atlas_set_powermode(struct atlas_data *data, int on)
115 return regmap_write(data->regmap, ATLAS_REG_PWR_CONTROL, on);
118 static int atlas_set_interrupt(struct atlas_data *data, bool state)
120 return regmap_update_bits(data->regmap, ATLAS_REG_INT_CONTROL,
121 ATLAS_REG_INT_CONTROL_EN,
122 state ? ATLAS_REG_INT_CONTROL_EN : 0);
125 static int atlas_buffer_postenable(struct iio_dev *indio_dev)
127 struct atlas_data *data = iio_priv(indio_dev);
130 ret = iio_triggered_buffer_postenable(indio_dev);
134 ret = pm_runtime_get_sync(&data->client->dev);
136 pm_runtime_put_noidle(&data->client->dev);
140 return atlas_set_interrupt(data, true);
143 static int atlas_buffer_predisable(struct iio_dev *indio_dev)
145 struct atlas_data *data = iio_priv(indio_dev);
148 ret = iio_triggered_buffer_predisable(indio_dev);
152 ret = atlas_set_interrupt(data, false);
156 pm_runtime_mark_last_busy(&data->client->dev);
157 return pm_runtime_put_autosuspend(&data->client->dev);
160 static const struct iio_trigger_ops atlas_interrupt_trigger_ops = {
161 .owner = THIS_MODULE,
164 static const struct iio_buffer_setup_ops atlas_buffer_setup_ops = {
165 .postenable = atlas_buffer_postenable,
166 .predisable = atlas_buffer_predisable,
169 static void atlas_work_handler(struct irq_work *work)
171 struct atlas_data *data = container_of(work, struct atlas_data, work);
173 iio_trigger_poll(data->trig);
176 static irqreturn_t atlas_trigger_handler(int irq, void *private)
178 struct iio_poll_func *pf = private;
179 struct iio_dev *indio_dev = pf->indio_dev;
180 struct atlas_data *data = iio_priv(indio_dev);
183 ret = i2c_smbus_read_i2c_block_data(data->client, ATLAS_REG_PH_DATA,
184 sizeof(data->buffer[0]), (u8 *) &data->buffer);
187 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
190 iio_trigger_notify_done(indio_dev->trig);
195 static irqreturn_t atlas_interrupt_handler(int irq, void *private)
197 struct iio_dev *indio_dev = private;
198 struct atlas_data *data = iio_priv(indio_dev);
200 irq_work_queue(&data->work);
205 static int atlas_read_ph_measurement(struct atlas_data *data, __be32 *val)
207 struct device *dev = &data->client->dev;
208 int suspended = pm_runtime_suspended(dev);
211 ret = pm_runtime_get_sync(dev);
213 pm_runtime_put_noidle(dev);
218 usleep_range(ATLAS_PH_INT_TIME_IN_US,
219 ATLAS_PH_INT_TIME_IN_US + 100000);
221 ret = regmap_bulk_read(data->regmap, ATLAS_REG_PH_DATA,
222 (u8 *) val, sizeof(*val));
224 pm_runtime_mark_last_busy(dev);
225 pm_runtime_put_autosuspend(dev);
230 static int atlas_read_raw(struct iio_dev *indio_dev,
231 struct iio_chan_spec const *chan,
232 int *val, int *val2, long mask)
234 struct atlas_data *data = iio_priv(indio_dev);
237 case IIO_CHAN_INFO_RAW: {
241 switch (chan->type) {
243 ret = regmap_bulk_read(data->regmap, chan->address,
244 (u8 *) ®, sizeof(reg));
247 mutex_lock(&indio_dev->mlock);
249 if (iio_buffer_enabled(indio_dev))
252 ret = atlas_read_ph_measurement(data, ®);
254 mutex_unlock(&indio_dev->mlock);
261 *val = be32_to_cpu(reg);
266 case IIO_CHAN_INFO_SCALE:
267 switch (chan->type) {
273 *val = 1; /* 0.001 */
279 return IIO_VAL_FRACTIONAL;
285 static int atlas_write_raw(struct iio_dev *indio_dev,
286 struct iio_chan_spec const *chan,
287 int val, int val2, long mask)
289 struct atlas_data *data = iio_priv(indio_dev);
290 __be32 reg = cpu_to_be32(val);
292 if (val2 != 0 || val < 0 || val > 20000)
295 if (mask != IIO_CHAN_INFO_RAW || chan->type != IIO_TEMP)
298 return regmap_bulk_write(data->regmap, chan->address,
302 static const struct iio_info atlas_info = {
303 .driver_module = THIS_MODULE,
304 .read_raw = atlas_read_raw,
305 .write_raw = atlas_write_raw,
308 static int atlas_check_calibration(struct atlas_data *data)
310 struct device *dev = &data->client->dev;
314 ret = regmap_read(data->regmap, ATLAS_REG_CALIB_STATUS, &val);
318 if (!(val & ATLAS_REG_CALIB_STATUS_MASK)) {
319 dev_warn(dev, "device has not been calibrated\n");
323 if (!(val & ATLAS_REG_CALIB_STATUS_LOW))
324 dev_warn(dev, "device missing low point calibration\n");
326 if (!(val & ATLAS_REG_CALIB_STATUS_MID))
327 dev_warn(dev, "device missing mid point calibration\n");
329 if (!(val & ATLAS_REG_CALIB_STATUS_HIGH))
330 dev_warn(dev, "device missing high point calibration\n");
335 static int atlas_probe(struct i2c_client *client,
336 const struct i2c_device_id *id)
338 struct atlas_data *data;
339 struct iio_trigger *trig;
340 struct iio_dev *indio_dev;
343 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
347 indio_dev->info = &atlas_info;
348 indio_dev->name = ATLAS_DRV_NAME;
349 indio_dev->channels = atlas_channels;
350 indio_dev->num_channels = ARRAY_SIZE(atlas_channels);
351 indio_dev->modes = INDIO_BUFFER_SOFTWARE | INDIO_DIRECT_MODE;
352 indio_dev->dev.parent = &client->dev;
354 trig = devm_iio_trigger_alloc(&client->dev, "%s-dev%d",
355 indio_dev->name, indio_dev->id);
360 data = iio_priv(indio_dev);
361 data->client = client;
363 trig->dev.parent = indio_dev->dev.parent;
364 trig->ops = &atlas_interrupt_trigger_ops;
365 iio_trigger_set_drvdata(trig, indio_dev);
367 i2c_set_clientdata(client, indio_dev);
369 data->regmap = devm_regmap_init_i2c(client, &atlas_regmap_config);
370 if (IS_ERR(data->regmap)) {
371 dev_err(&client->dev, "regmap initialization failed\n");
372 return PTR_ERR(data->regmap);
375 ret = pm_runtime_set_active(&client->dev);
379 if (client->irq <= 0) {
380 dev_err(&client->dev, "no valid irq defined\n");
384 ret = atlas_check_calibration(data);
388 ret = iio_trigger_register(trig);
390 dev_err(&client->dev, "failed to register trigger\n");
394 ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
395 &atlas_trigger_handler, &atlas_buffer_setup_ops);
397 dev_err(&client->dev, "cannot setup iio trigger\n");
398 goto unregister_trigger;
401 init_irq_work(&data->work, atlas_work_handler);
403 /* interrupt pin toggles on new conversion */
404 ret = devm_request_threaded_irq(&client->dev, client->irq,
405 NULL, atlas_interrupt_handler,
406 IRQF_TRIGGER_RISING |
407 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
411 dev_err(&client->dev, "request irq (%d) failed\n", client->irq);
412 goto unregister_buffer;
415 ret = atlas_set_powermode(data, 1);
417 dev_err(&client->dev, "cannot power device on");
418 goto unregister_buffer;
421 pm_runtime_enable(&client->dev);
422 pm_runtime_set_autosuspend_delay(&client->dev, 2500);
423 pm_runtime_use_autosuspend(&client->dev);
425 ret = iio_device_register(indio_dev);
427 dev_err(&client->dev, "unable to register device\n");
434 pm_runtime_disable(&client->dev);
435 atlas_set_powermode(data, 0);
438 iio_triggered_buffer_cleanup(indio_dev);
441 iio_trigger_unregister(data->trig);
446 static int atlas_remove(struct i2c_client *client)
448 struct iio_dev *indio_dev = i2c_get_clientdata(client);
449 struct atlas_data *data = iio_priv(indio_dev);
451 iio_device_unregister(indio_dev);
452 iio_triggered_buffer_cleanup(indio_dev);
453 iio_trigger_unregister(data->trig);
455 pm_runtime_disable(&client->dev);
456 pm_runtime_set_suspended(&client->dev);
457 pm_runtime_put_noidle(&client->dev);
459 return atlas_set_powermode(data, 0);
463 static int atlas_runtime_suspend(struct device *dev)
465 struct atlas_data *data =
466 iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
468 return atlas_set_powermode(data, 0);
471 static int atlas_runtime_resume(struct device *dev)
473 struct atlas_data *data =
474 iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
476 return atlas_set_powermode(data, 1);
480 static const struct dev_pm_ops atlas_pm_ops = {
481 SET_RUNTIME_PM_OPS(atlas_runtime_suspend,
482 atlas_runtime_resume, NULL)
485 static const struct i2c_device_id atlas_id[] = {
486 { "atlas-ph-sm", 0 },
489 MODULE_DEVICE_TABLE(i2c, atlas_id);
491 static const struct of_device_id atlas_dt_ids[] = {
492 { .compatible = "atlas,ph-sm" },
495 MODULE_DEVICE_TABLE(of, atlas_dt_ids);
497 static struct i2c_driver atlas_driver = {
499 .name = ATLAS_DRV_NAME,
500 .of_match_table = of_match_ptr(atlas_dt_ids),
503 .probe = atlas_probe,
504 .remove = atlas_remove,
505 .id_table = atlas_id,
507 module_i2c_driver(atlas_driver);
509 MODULE_AUTHOR("Matt Ranostay <mranostay@gmail.com>");
510 MODULE_DESCRIPTION("Atlas Scientific pH-SM sensor");
511 MODULE_LICENSE("GPL");