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>
25 #define ADE7759_WAVEFORM 0x01
26 #define ADE7759_AENERGY 0x02
27 #define ADE7759_RSTENERGY 0x03
28 #define ADE7759_STATUS 0x04
29 #define ADE7759_RSTSTATUS 0x05
30 #define ADE7759_MODE 0x06
31 #define ADE7759_CFDEN 0x07
32 #define ADE7759_CH1OS 0x08
33 #define ADE7759_CH2OS 0x09
34 #define ADE7759_GAIN 0x0A
35 #define ADE7759_APGAIN 0x0B
36 #define ADE7759_PHCAL 0x0C
37 #define ADE7759_APOS 0x0D
38 #define ADE7759_ZXTOUT 0x0E
39 #define ADE7759_SAGCYC 0x0F
40 #define ADE7759_IRQEN 0x10
41 #define ADE7759_SAGLVL 0x11
42 #define ADE7759_TEMP 0x12
43 #define ADE7759_LINECYC 0x13
44 #define ADE7759_LENERGY 0x14
45 #define ADE7759_CFNUM 0x15
46 #define ADE7759_CHKSUM 0x1E
47 #define ADE7759_DIEREV 0x1F
49 #define ADE7759_READ_REG(a) a
50 #define ADE7759_WRITE_REG(a) ((a) | 0x80)
52 #define ADE7759_MAX_TX 6
53 #define ADE7759_MAX_RX 6
54 #define ADE7759_STARTUP_DELAY 1000
56 #define ADE7759_SPI_SLOW (u32)(300 * 1000)
57 #define ADE7759_SPI_BURST (u32)(1000 * 1000)
58 #define ADE7759_SPI_FAST (u32)(2000 * 1000)
61 * struct ade7759_state - device instance specific data
62 * @us: actual spi_device
63 * @buf_lock: mutex to protect tx and rx and write frequency
64 * @tx: transmit buffer
67 struct ade7759_state {
68 struct spi_device *us;
69 struct mutex buf_lock;
70 u8 tx[ADE7759_MAX_TX] ____cacheline_aligned;
71 u8 rx[ADE7759_MAX_RX];
74 static int ade7759_spi_write_reg_8(struct device *dev,
79 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
80 struct ade7759_state *st = iio_priv(indio_dev);
82 mutex_lock(&st->buf_lock);
83 st->tx[0] = ADE7759_WRITE_REG(reg_address);
86 ret = spi_write(st->us, st->tx, 2);
87 mutex_unlock(&st->buf_lock);
92 /*Unlocked version of ade7759_spi_write_reg_16 function */
93 static int __ade7759_spi_write_reg_16(struct device *dev,
97 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
98 struct ade7759_state *st = iio_priv(indio_dev);
100 st->tx[0] = ADE7759_WRITE_REG(reg_address);
101 st->tx[1] = (value >> 8) & 0xFF;
102 st->tx[2] = value & 0xFF;
103 return spi_write(st->us, st->tx, 3);
106 static int ade7759_spi_write_reg_16(struct device *dev,
111 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
112 struct ade7759_state *st = iio_priv(indio_dev);
114 mutex_lock(&st->buf_lock);
115 ret = __ade7759_spi_write_reg_16(dev, reg_address, value);
116 mutex_unlock(&st->buf_lock);
121 static int ade7759_spi_read_reg_8(struct device *dev,
125 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
126 struct ade7759_state *st = iio_priv(indio_dev);
129 ret = spi_w8r8(st->us, ADE7759_READ_REG(reg_address));
131 dev_err(&st->us->dev,
132 "problem when reading 8 bit register 0x%02X",
141 static int ade7759_spi_read_reg_16(struct device *dev,
145 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
146 struct ade7759_state *st = iio_priv(indio_dev);
149 ret = spi_w8r16be(st->us, ADE7759_READ_REG(reg_address));
151 dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
161 static int ade7759_spi_read_reg_40(struct device *dev,
165 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
166 struct ade7759_state *st = iio_priv(indio_dev);
168 struct spi_transfer xfers[] = {
177 mutex_lock(&st->buf_lock);
178 st->tx[0] = ADE7759_READ_REG(reg_address);
179 memset(&st->tx[1], 0, 5);
181 ret = spi_sync_transfer(st->us, xfers, ARRAY_SIZE(xfers));
183 dev_err(&st->us->dev,
184 "problem when reading 40 bit register 0x%02X",
188 *val = ((u64)st->rx[1] << 32) | ((u64)st->rx[2] << 24) |
189 (st->rx[3] << 16) | (st->rx[4] << 8) | st->rx[5];
192 mutex_unlock(&st->buf_lock);
196 static ssize_t ade7759_read_8bit(struct device *dev,
197 struct device_attribute *attr,
202 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
204 ret = ade7759_spi_read_reg_8(dev, this_attr->address, &val);
208 return sprintf(buf, "%u\n", val);
211 static ssize_t ade7759_read_16bit(struct device *dev,
212 struct device_attribute *attr,
217 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
219 ret = ade7759_spi_read_reg_16(dev, this_attr->address, &val);
223 return sprintf(buf, "%u\n", val);
226 static ssize_t ade7759_read_40bit(struct device *dev,
227 struct device_attribute *attr,
232 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
234 ret = ade7759_spi_read_reg_40(dev, this_attr->address, &val);
238 return sprintf(buf, "%llu\n", val);
241 static ssize_t ade7759_write_8bit(struct device *dev,
242 struct device_attribute *attr,
246 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
250 ret = kstrtou8(buf, 10, &val);
253 ret = ade7759_spi_write_reg_8(dev, this_attr->address, val);
256 return ret ? ret : len;
259 static ssize_t ade7759_write_16bit(struct device *dev,
260 struct device_attribute *attr,
264 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
268 ret = kstrtou16(buf, 10, &val);
271 ret = ade7759_spi_write_reg_16(dev, this_attr->address, val);
274 return ret ? ret : len;
277 static int ade7759_reset(struct device *dev)
282 ret = ade7759_spi_read_reg_16(dev, ADE7759_MODE, &val);
286 val |= BIT(6); /* Software Chip Reset */
287 return ade7759_spi_write_reg_16(dev,
292 static IIO_DEV_ATTR_AENERGY(ade7759_read_40bit, ADE7759_AENERGY);
293 static IIO_DEV_ATTR_CFDEN(0644,
297 static IIO_DEV_ATTR_CFNUM(0644,
301 static IIO_DEV_ATTR_CHKSUM(ade7759_read_8bit, ADE7759_CHKSUM);
302 static IIO_DEV_ATTR_PHCAL(0644,
306 static IIO_DEV_ATTR_APOS(0644,
310 static IIO_DEV_ATTR_SAGCYC(0644,
314 static IIO_DEV_ATTR_SAGLVL(0644,
318 static IIO_DEV_ATTR_LINECYC(0644,
322 static IIO_DEV_ATTR_LENERGY(ade7759_read_40bit, ADE7759_LENERGY);
323 static IIO_DEV_ATTR_PGA_GAIN(0644,
327 static IIO_DEV_ATTR_ACTIVE_POWER_GAIN(0644,
331 static IIO_DEV_ATTR_CH_OFF(1, 0644,
335 static IIO_DEV_ATTR_CH_OFF(2, 0644,
340 static int ade7759_set_irq(struct device *dev, bool enable)
345 ret = ade7759_spi_read_reg_8(dev, ADE7759_IRQEN, &irqen);
350 irqen |= BIT(3); /* Enables an interrupt when a data is
351 * present in the waveform register
356 ret = ade7759_spi_write_reg_8(dev, ADE7759_IRQEN, irqen);
362 /* Power down the device */
363 static int ade7759_stop_device(struct device *dev)
368 ret = ade7759_spi_read_reg_16(dev, ADE7759_MODE, &val);
370 dev_err(dev, "unable to power down the device, error: %d\n",
375 val |= BIT(4); /* AD converters can be turned off */
377 return ade7759_spi_write_reg_16(dev, ADE7759_MODE, val);
380 static int ade7759_initial_setup(struct iio_dev *indio_dev)
383 struct ade7759_state *st = iio_priv(indio_dev);
384 struct device *dev = &indio_dev->dev;
386 /* use low spi speed for init */
387 st->us->mode = SPI_MODE_3;
391 ret = ade7759_set_irq(dev, false);
393 dev_err(dev, "disable irq failed");
398 usleep_range(ADE7759_STARTUP_DELAY, ADE7759_STARTUP_DELAY + 100);
404 static ssize_t ade7759_read_frequency(struct device *dev,
405 struct device_attribute *attr,
412 ret = ade7759_spi_read_reg_16(dev, ADE7759_MODE, &t);
417 sps = 27900 / (1 + t);
419 return sprintf(buf, "%d\n", sps);
422 static ssize_t ade7759_write_frequency(struct device *dev,
423 struct device_attribute *attr,
427 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
428 struct ade7759_state *st = iio_priv(indio_dev);
433 ret = kstrtou16(buf, 10, &val);
439 mutex_lock(&st->buf_lock);
446 st->us->max_speed_hz = ADE7759_SPI_SLOW;
448 st->us->max_speed_hz = ADE7759_SPI_FAST;
450 ret = ade7759_spi_read_reg_16(dev, ADE7759_MODE, ®);
457 ret = __ade7759_spi_write_reg_16(dev, ADE7759_MODE, reg);
460 mutex_unlock(&st->buf_lock);
462 return ret ? ret : len;
464 static IIO_DEV_ATTR_TEMP_RAW(ade7759_read_8bit);
465 static IIO_CONST_ATTR(in_temp_offset, "70 C");
466 static IIO_CONST_ATTR(in_temp_scale, "1 C");
468 static IIO_DEV_ATTR_SAMP_FREQ(0644,
469 ade7759_read_frequency,
470 ade7759_write_frequency);
472 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("27900 14000 7000 3500");
474 static struct attribute *ade7759_attributes[] = {
475 &iio_dev_attr_in_temp_raw.dev_attr.attr,
476 &iio_const_attr_in_temp_offset.dev_attr.attr,
477 &iio_const_attr_in_temp_scale.dev_attr.attr,
478 &iio_dev_attr_sampling_frequency.dev_attr.attr,
479 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
480 &iio_dev_attr_phcal.dev_attr.attr,
481 &iio_dev_attr_cfden.dev_attr.attr,
482 &iio_dev_attr_aenergy.dev_attr.attr,
483 &iio_dev_attr_cfnum.dev_attr.attr,
484 &iio_dev_attr_apos.dev_attr.attr,
485 &iio_dev_attr_sagcyc.dev_attr.attr,
486 &iio_dev_attr_saglvl.dev_attr.attr,
487 &iio_dev_attr_linecyc.dev_attr.attr,
488 &iio_dev_attr_lenergy.dev_attr.attr,
489 &iio_dev_attr_chksum.dev_attr.attr,
490 &iio_dev_attr_pga_gain.dev_attr.attr,
491 &iio_dev_attr_active_power_gain.dev_attr.attr,
492 &iio_dev_attr_choff_1.dev_attr.attr,
493 &iio_dev_attr_choff_2.dev_attr.attr,
497 static const struct attribute_group ade7759_attribute_group = {
498 .attrs = ade7759_attributes,
501 static const struct iio_info ade7759_info = {
502 .attrs = &ade7759_attribute_group,
505 static int ade7759_probe(struct spi_device *spi)
508 struct ade7759_state *st;
509 struct iio_dev *indio_dev;
511 /* setup the industrialio driver allocated elements */
512 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
515 /* this is only used for removal purposes */
516 spi_set_drvdata(spi, indio_dev);
518 st = iio_priv(indio_dev);
520 mutex_init(&st->buf_lock);
521 indio_dev->name = spi->dev.driver->name;
522 indio_dev->dev.parent = &spi->dev;
523 indio_dev->info = &ade7759_info;
524 indio_dev->modes = INDIO_DIRECT_MODE;
526 /* Get the device into a sane initial state */
527 ret = ade7759_initial_setup(indio_dev);
531 return iio_device_register(indio_dev);
534 static int ade7759_remove(struct spi_device *spi)
536 struct iio_dev *indio_dev = spi_get_drvdata(spi);
538 iio_device_unregister(indio_dev);
539 ade7759_stop_device(&indio_dev->dev);
544 static struct spi_driver ade7759_driver = {
548 .probe = ade7759_probe,
549 .remove = ade7759_remove,
551 module_spi_driver(ade7759_driver);
553 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
554 MODULE_DESCRIPTION("Analog Devices ADE7759 Active Energy Metering IC Driver");
555 MODULE_LICENSE("GPL v2");
556 MODULE_ALIAS("spi:ad7759");