2 * ADE7759 Active Energy Metering IC with di/dt Sensor Interface Driver
4 * Copyright 2010 Analog Devices Inc.
6 * Licensed under the GPL-2 or later.
9 #include <linux/interrupt.h>
10 #include <linux/irq.h>
11 #include <linux/delay.h>
12 #include <linux/mutex.h>
13 #include <linux/device.h>
14 #include <linux/kernel.h>
15 #include <linux/spi/spi.h>
16 #include <linux/slab.h>
17 #include <linux/sysfs.h>
18 #include <linux/list.h>
19 #include <linux/module.h>
21 #include <linux/iio/iio.h>
22 #include <linux/iio/sysfs.h>
26 static int ade7759_spi_write_reg_8(struct device *dev,
31 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
32 struct ade7759_state *st = iio_priv(indio_dev);
34 mutex_lock(&st->buf_lock);
35 st->tx[0] = ADE7759_WRITE_REG(reg_address);
38 ret = spi_write(st->us, st->tx, 2);
39 mutex_unlock(&st->buf_lock);
44 static int ade7759_spi_write_reg_16(struct device *dev,
49 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
50 struct ade7759_state *st = iio_priv(indio_dev);
52 mutex_lock(&st->buf_lock);
53 st->tx[0] = ADE7759_WRITE_REG(reg_address);
54 st->tx[1] = (value >> 8) & 0xFF;
55 st->tx[2] = value & 0xFF;
56 ret = spi_write(st->us, st->tx, 3);
57 mutex_unlock(&st->buf_lock);
62 static int ade7759_spi_read_reg_8(struct device *dev,
66 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
67 struct ade7759_state *st = iio_priv(indio_dev);
70 ret = spi_w8r8(st->us, ADE7759_READ_REG(reg_address));
72 dev_err(&st->us->dev, "problem when reading 8 bit register 0x%02X",
81 static int ade7759_spi_read_reg_16(struct device *dev,
85 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
86 struct ade7759_state *st = iio_priv(indio_dev);
89 ret = spi_w8r16be(st->us, ADE7759_READ_REG(reg_address));
91 dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
101 static int ade7759_spi_read_reg_40(struct device *dev,
105 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
106 struct ade7759_state *st = iio_priv(indio_dev);
108 struct spi_transfer xfers[] = {
117 mutex_lock(&st->buf_lock);
118 st->tx[0] = ADE7759_READ_REG(reg_address);
119 memset(&st->tx[1], 0 , 5);
121 ret = spi_sync_transfer(st->us, xfers, ARRAY_SIZE(xfers));
123 dev_err(&st->us->dev, "problem when reading 40 bit register 0x%02X",
127 *val = ((u64)st->rx[1] << 32) | (st->rx[2] << 24) |
128 (st->rx[3] << 16) | (st->rx[4] << 8) | st->rx[5];
131 mutex_unlock(&st->buf_lock);
135 static ssize_t ade7759_read_8bit(struct device *dev,
136 struct device_attribute *attr,
141 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
143 ret = ade7759_spi_read_reg_8(dev, this_attr->address, &val);
147 return sprintf(buf, "%u\n", val);
150 static ssize_t ade7759_read_16bit(struct device *dev,
151 struct device_attribute *attr,
156 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
158 ret = ade7759_spi_read_reg_16(dev, this_attr->address, &val);
162 return sprintf(buf, "%u\n", val);
165 static ssize_t ade7759_read_40bit(struct device *dev,
166 struct device_attribute *attr,
171 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
173 ret = ade7759_spi_read_reg_40(dev, this_attr->address, &val);
177 return sprintf(buf, "%llu\n", val);
180 static ssize_t ade7759_write_8bit(struct device *dev,
181 struct device_attribute *attr,
185 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
189 ret = kstrtou8(buf, 10, &val);
192 ret = ade7759_spi_write_reg_8(dev, this_attr->address, val);
195 return ret ? ret : len;
198 static ssize_t ade7759_write_16bit(struct device *dev,
199 struct device_attribute *attr,
203 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
207 ret = kstrtou16(buf, 10, &val);
210 ret = ade7759_spi_write_reg_16(dev, this_attr->address, val);
213 return ret ? ret : len;
216 static int ade7759_reset(struct device *dev)
221 ade7759_spi_read_reg_16(dev,
224 val |= 1 << 6; /* Software Chip Reset */
225 ret = ade7759_spi_write_reg_16(dev,
232 static IIO_DEV_ATTR_AENERGY(ade7759_read_40bit, ADE7759_AENERGY);
233 static IIO_DEV_ATTR_CFDEN(S_IWUSR | S_IRUGO,
237 static IIO_DEV_ATTR_CFNUM(S_IWUSR | S_IRUGO,
241 static IIO_DEV_ATTR_CHKSUM(ade7759_read_8bit, ADE7759_CHKSUM);
242 static IIO_DEV_ATTR_PHCAL(S_IWUSR | S_IRUGO,
246 static IIO_DEV_ATTR_APOS(S_IWUSR | S_IRUGO,
250 static IIO_DEV_ATTR_SAGCYC(S_IWUSR | S_IRUGO,
254 static IIO_DEV_ATTR_SAGLVL(S_IWUSR | S_IRUGO,
258 static IIO_DEV_ATTR_LINECYC(S_IWUSR | S_IRUGO,
262 static IIO_DEV_ATTR_LENERGY(ade7759_read_40bit, ADE7759_LENERGY);
263 static IIO_DEV_ATTR_PGA_GAIN(S_IWUSR | S_IRUGO,
267 static IIO_DEV_ATTR_ACTIVE_POWER_GAIN(S_IWUSR | S_IRUGO,
271 static IIO_DEV_ATTR_CH_OFF(1, S_IWUSR | S_IRUGO,
275 static IIO_DEV_ATTR_CH_OFF(2, S_IWUSR | S_IRUGO,
280 static int ade7759_set_irq(struct device *dev, bool enable)
285 ret = ade7759_spi_read_reg_8(dev, ADE7759_IRQEN, &irqen);
290 irqen |= 1 << 3; /* Enables an interrupt when a data is
291 present in the waveform register */
295 ret = ade7759_spi_write_reg_8(dev, ADE7759_IRQEN, irqen);
301 /* Power down the device */
302 static int ade7759_stop_device(struct device *dev)
306 ade7759_spi_read_reg_16(dev,
309 val |= 1 << 4; /* AD converters can be turned off */
311 return ade7759_spi_write_reg_16(dev, ADE7759_MODE, val);
314 static int ade7759_initial_setup(struct iio_dev *indio_dev)
317 struct ade7759_state *st = iio_priv(indio_dev);
318 struct device *dev = &indio_dev->dev;
320 /* use low spi speed for init */
321 st->us->mode = SPI_MODE_3;
325 ret = ade7759_set_irq(dev, false);
327 dev_err(dev, "disable irq failed");
332 msleep(ADE7759_STARTUP_DELAY);
338 static ssize_t ade7759_read_frequency(struct device *dev,
339 struct device_attribute *attr,
346 ret = ade7759_spi_read_reg_16(dev,
353 sps = 27900 / (1 + t);
355 return sprintf(buf, "%d\n", sps);
358 static ssize_t ade7759_write_frequency(struct device *dev,
359 struct device_attribute *attr,
363 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
364 struct ade7759_state *st = iio_priv(indio_dev);
369 ret = kstrtou16(buf, 10, &val);
375 mutex_lock(&indio_dev->mlock);
382 st->us->max_speed_hz = ADE7759_SPI_SLOW;
384 st->us->max_speed_hz = ADE7759_SPI_FAST;
386 ret = ade7759_spi_read_reg_16(dev, ADE7759_MODE, ®);
393 ret = ade7759_spi_write_reg_16(dev, ADE7759_MODE, reg);
396 mutex_unlock(&indio_dev->mlock);
398 return ret ? ret : len;
400 static IIO_DEV_ATTR_TEMP_RAW(ade7759_read_8bit);
401 static IIO_CONST_ATTR(in_temp_offset, "70 C");
402 static IIO_CONST_ATTR(in_temp_scale, "1 C");
404 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
405 ade7759_read_frequency,
406 ade7759_write_frequency);
408 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("27900 14000 7000 3500");
410 static struct attribute *ade7759_attributes[] = {
411 &iio_dev_attr_in_temp_raw.dev_attr.attr,
412 &iio_const_attr_in_temp_offset.dev_attr.attr,
413 &iio_const_attr_in_temp_scale.dev_attr.attr,
414 &iio_dev_attr_sampling_frequency.dev_attr.attr,
415 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
416 &iio_dev_attr_phcal.dev_attr.attr,
417 &iio_dev_attr_cfden.dev_attr.attr,
418 &iio_dev_attr_aenergy.dev_attr.attr,
419 &iio_dev_attr_cfnum.dev_attr.attr,
420 &iio_dev_attr_apos.dev_attr.attr,
421 &iio_dev_attr_sagcyc.dev_attr.attr,
422 &iio_dev_attr_saglvl.dev_attr.attr,
423 &iio_dev_attr_linecyc.dev_attr.attr,
424 &iio_dev_attr_lenergy.dev_attr.attr,
425 &iio_dev_attr_chksum.dev_attr.attr,
426 &iio_dev_attr_pga_gain.dev_attr.attr,
427 &iio_dev_attr_active_power_gain.dev_attr.attr,
428 &iio_dev_attr_choff_1.dev_attr.attr,
429 &iio_dev_attr_choff_2.dev_attr.attr,
433 static const struct attribute_group ade7759_attribute_group = {
434 .attrs = ade7759_attributes,
437 static const struct iio_info ade7759_info = {
438 .attrs = &ade7759_attribute_group,
439 .driver_module = THIS_MODULE,
442 static int ade7759_probe(struct spi_device *spi)
445 struct ade7759_state *st;
446 struct iio_dev *indio_dev;
448 /* setup the industrialio driver allocated elements */
449 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
452 /* this is only used for removal purposes */
453 spi_set_drvdata(spi, indio_dev);
455 st = iio_priv(indio_dev);
457 mutex_init(&st->buf_lock);
458 indio_dev->name = spi->dev.driver->name;
459 indio_dev->dev.parent = &spi->dev;
460 indio_dev->info = &ade7759_info;
461 indio_dev->modes = INDIO_DIRECT_MODE;
463 /* Get the device into a sane initial state */
464 ret = ade7759_initial_setup(indio_dev);
468 ret = iio_device_register(indio_dev);
475 /* fixme, confirm ordering in this function */
476 static int ade7759_remove(struct spi_device *spi)
478 struct iio_dev *indio_dev = spi_get_drvdata(spi);
480 iio_device_unregister(indio_dev);
481 ade7759_stop_device(&indio_dev->dev);
486 static struct spi_driver ade7759_driver = {
489 .owner = THIS_MODULE,
491 .probe = ade7759_probe,
492 .remove = ade7759_remove,
494 module_spi_driver(ade7759_driver);
496 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
497 MODULE_DESCRIPTION("Analog Devices ADE7759 Active Energy Metering IC Driver");
498 MODULE_LICENSE("GPL v2");
499 MODULE_ALIAS("spi:ad7759");