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
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 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 mutex_lock(&st->buf_lock);
101 st->tx[0] = ADE7759_WRITE_REG(reg_address);
102 st->tx[1] = (value >> 8) & 0xFF;
103 st->tx[2] = value & 0xFF;
104 ret = spi_write(st->us, st->tx, 3);
105 mutex_unlock(&st->buf_lock);
110 static int ade7759_spi_read_reg_8(struct device *dev,
114 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
115 struct ade7759_state *st = iio_priv(indio_dev);
118 ret = spi_w8r8(st->us, ADE7759_READ_REG(reg_address));
120 dev_err(&st->us->dev, "problem when reading 8 bit register 0x%02X",
129 static int ade7759_spi_read_reg_16(struct device *dev,
133 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
134 struct ade7759_state *st = iio_priv(indio_dev);
137 ret = spi_w8r16be(st->us, ADE7759_READ_REG(reg_address));
139 dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
149 static int ade7759_spi_read_reg_40(struct device *dev,
153 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
154 struct ade7759_state *st = iio_priv(indio_dev);
156 struct spi_transfer xfers[] = {
165 mutex_lock(&st->buf_lock);
166 st->tx[0] = ADE7759_READ_REG(reg_address);
167 memset(&st->tx[1], 0, 5);
169 ret = spi_sync_transfer(st->us, xfers, ARRAY_SIZE(xfers));
171 dev_err(&st->us->dev, "problem when reading 40 bit register 0x%02X",
175 *val = ((u64)st->rx[1] << 32) | (st->rx[2] << 24) |
176 (st->rx[3] << 16) | (st->rx[4] << 8) | st->rx[5];
179 mutex_unlock(&st->buf_lock);
183 static ssize_t ade7759_read_8bit(struct device *dev,
184 struct device_attribute *attr,
189 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
191 ret = ade7759_spi_read_reg_8(dev, this_attr->address, &val);
195 return sprintf(buf, "%u\n", val);
198 static ssize_t ade7759_read_16bit(struct device *dev,
199 struct device_attribute *attr,
204 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
206 ret = ade7759_spi_read_reg_16(dev, this_attr->address, &val);
210 return sprintf(buf, "%u\n", val);
213 static ssize_t ade7759_read_40bit(struct device *dev,
214 struct device_attribute *attr,
219 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
221 ret = ade7759_spi_read_reg_40(dev, this_attr->address, &val);
225 return sprintf(buf, "%llu\n", val);
228 static ssize_t ade7759_write_8bit(struct device *dev,
229 struct device_attribute *attr,
233 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
237 ret = kstrtou8(buf, 10, &val);
240 ret = ade7759_spi_write_reg_8(dev, this_attr->address, val);
243 return ret ? ret : len;
246 static ssize_t ade7759_write_16bit(struct device *dev,
247 struct device_attribute *attr,
251 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
255 ret = kstrtou16(buf, 10, &val);
258 ret = ade7759_spi_write_reg_16(dev, this_attr->address, val);
261 return ret ? ret : len;
264 static int ade7759_reset(struct device *dev)
269 ret = ade7759_spi_read_reg_16(dev,
275 val |= BIT(6); /* Software Chip Reset */
276 return ade7759_spi_write_reg_16(dev,
281 static IIO_DEV_ATTR_AENERGY(ade7759_read_40bit, ADE7759_AENERGY);
282 static IIO_DEV_ATTR_CFDEN(0644,
286 static IIO_DEV_ATTR_CFNUM(0644,
290 static IIO_DEV_ATTR_CHKSUM(ade7759_read_8bit, ADE7759_CHKSUM);
291 static IIO_DEV_ATTR_PHCAL(0644,
295 static IIO_DEV_ATTR_APOS(0644,
299 static IIO_DEV_ATTR_SAGCYC(0644,
303 static IIO_DEV_ATTR_SAGLVL(0644,
307 static IIO_DEV_ATTR_LINECYC(0644,
311 static IIO_DEV_ATTR_LENERGY(ade7759_read_40bit, ADE7759_LENERGY);
312 static IIO_DEV_ATTR_PGA_GAIN(0644,
316 static IIO_DEV_ATTR_ACTIVE_POWER_GAIN(0644,
320 static IIO_DEV_ATTR_CH_OFF(1, 0644,
324 static IIO_DEV_ATTR_CH_OFF(2, 0644,
329 static int ade7759_set_irq(struct device *dev, bool enable)
334 ret = ade7759_spi_read_reg_8(dev, ADE7759_IRQEN, &irqen);
339 irqen |= BIT(3); /* Enables an interrupt when a data is
340 * present in the waveform register
345 ret = ade7759_spi_write_reg_8(dev, ADE7759_IRQEN, irqen);
351 /* Power down the device */
352 static int ade7759_stop_device(struct device *dev)
357 ret = ade7759_spi_read_reg_16(dev,
361 dev_err(dev, "unable to power down the device, error: %d\n",
366 val |= BIT(4); /* AD converters can be turned off */
368 return ade7759_spi_write_reg_16(dev, ADE7759_MODE, val);
371 static int ade7759_initial_setup(struct iio_dev *indio_dev)
374 struct ade7759_state *st = iio_priv(indio_dev);
375 struct device *dev = &indio_dev->dev;
377 /* use low spi speed for init */
378 st->us->mode = SPI_MODE_3;
382 ret = ade7759_set_irq(dev, false);
384 dev_err(dev, "disable irq failed");
389 usleep_range(ADE7759_STARTUP_DELAY, ADE7759_STARTUP_DELAY + 100);
395 static ssize_t ade7759_read_frequency(struct device *dev,
396 struct device_attribute *attr,
403 ret = ade7759_spi_read_reg_16(dev,
410 sps = 27900 / (1 + t);
412 return sprintf(buf, "%d\n", sps);
415 static ssize_t ade7759_write_frequency(struct device *dev,
416 struct device_attribute *attr,
420 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
421 struct ade7759_state *st = iio_priv(indio_dev);
426 ret = kstrtou16(buf, 10, &val);
432 mutex_lock(&indio_dev->mlock);
439 st->us->max_speed_hz = ADE7759_SPI_SLOW;
441 st->us->max_speed_hz = ADE7759_SPI_FAST;
443 ret = ade7759_spi_read_reg_16(dev, ADE7759_MODE, ®);
450 ret = ade7759_spi_write_reg_16(dev, ADE7759_MODE, reg);
453 mutex_unlock(&indio_dev->mlock);
455 return ret ? ret : len;
457 static IIO_DEV_ATTR_TEMP_RAW(ade7759_read_8bit);
458 static IIO_CONST_ATTR(in_temp_offset, "70 C");
459 static IIO_CONST_ATTR(in_temp_scale, "1 C");
461 static IIO_DEV_ATTR_SAMP_FREQ(0644,
462 ade7759_read_frequency,
463 ade7759_write_frequency);
465 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("27900 14000 7000 3500");
467 static struct attribute *ade7759_attributes[] = {
468 &iio_dev_attr_in_temp_raw.dev_attr.attr,
469 &iio_const_attr_in_temp_offset.dev_attr.attr,
470 &iio_const_attr_in_temp_scale.dev_attr.attr,
471 &iio_dev_attr_sampling_frequency.dev_attr.attr,
472 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
473 &iio_dev_attr_phcal.dev_attr.attr,
474 &iio_dev_attr_cfden.dev_attr.attr,
475 &iio_dev_attr_aenergy.dev_attr.attr,
476 &iio_dev_attr_cfnum.dev_attr.attr,
477 &iio_dev_attr_apos.dev_attr.attr,
478 &iio_dev_attr_sagcyc.dev_attr.attr,
479 &iio_dev_attr_saglvl.dev_attr.attr,
480 &iio_dev_attr_linecyc.dev_attr.attr,
481 &iio_dev_attr_lenergy.dev_attr.attr,
482 &iio_dev_attr_chksum.dev_attr.attr,
483 &iio_dev_attr_pga_gain.dev_attr.attr,
484 &iio_dev_attr_active_power_gain.dev_attr.attr,
485 &iio_dev_attr_choff_1.dev_attr.attr,
486 &iio_dev_attr_choff_2.dev_attr.attr,
490 static const struct attribute_group ade7759_attribute_group = {
491 .attrs = ade7759_attributes,
494 static const struct iio_info ade7759_info = {
495 .attrs = &ade7759_attribute_group,
496 .driver_module = THIS_MODULE,
499 static int ade7759_probe(struct spi_device *spi)
502 struct ade7759_state *st;
503 struct iio_dev *indio_dev;
505 /* setup the industrialio driver allocated elements */
506 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
509 /* this is only used for removal purposes */
510 spi_set_drvdata(spi, indio_dev);
512 st = iio_priv(indio_dev);
514 mutex_init(&st->buf_lock);
515 indio_dev->name = spi->dev.driver->name;
516 indio_dev->dev.parent = &spi->dev;
517 indio_dev->info = &ade7759_info;
518 indio_dev->modes = INDIO_DIRECT_MODE;
520 /* Get the device into a sane initial state */
521 ret = ade7759_initial_setup(indio_dev);
525 return iio_device_register(indio_dev);
528 static int ade7759_remove(struct spi_device *spi)
530 struct iio_dev *indio_dev = spi_get_drvdata(spi);
532 iio_device_unregister(indio_dev);
533 ade7759_stop_device(&indio_dev->dev);
538 static struct spi_driver ade7759_driver = {
542 .probe = ade7759_probe,
543 .remove = ade7759_remove,
545 module_spi_driver(ade7759_driver);
547 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
548 MODULE_DESCRIPTION("Analog Devices ADE7759 Active Energy Metering IC Driver");
549 MODULE_LICENSE("GPL v2");
550 MODULE_ALIAS("spi:ad7759");