2 * ADE7754 Polyphase Multifunction Energy Metering IC 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 ade7754_spi_write_reg_8(struct device *dev,
31 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
32 struct ade7754_state *st = iio_priv(indio_dev);
34 mutex_lock(&st->buf_lock);
35 st->tx[0] = ADE7754_WRITE_REG(reg_address);
38 ret = spi_write(st->us, st->tx, 2);
39 mutex_unlock(&st->buf_lock);
44 static int ade7754_spi_write_reg_16(struct device *dev,
49 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
50 struct ade7754_state *st = iio_priv(indio_dev);
52 mutex_lock(&st->buf_lock);
53 st->tx[0] = ADE7754_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 ade7754_spi_read_reg_8(struct device *dev,
66 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
67 struct ade7754_state *st = iio_priv(indio_dev);
70 ret = spi_w8r8(st->us, ADE7754_READ_REG(reg_address));
72 dev_err(&st->us->dev, "problem when reading 8 bit register 0x%02X",
81 static int ade7754_spi_read_reg_16(struct device *dev,
85 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
86 struct ade7754_state *st = iio_priv(indio_dev);
89 ret = spi_w8r16(st->us, ADE7754_READ_REG(reg_address));
91 dev_err(&st->us->dev, "problem when reading 16 bit register 0x%02X",
97 *val = be16_to_cpup(val);
102 static int ade7754_spi_read_reg_24(struct device *dev,
106 struct spi_message msg;
107 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
108 struct ade7754_state *st = iio_priv(indio_dev);
110 struct spi_transfer xfers[] = {
119 mutex_lock(&st->buf_lock);
120 st->tx[0] = ADE7754_READ_REG(reg_address);
125 spi_message_init(&msg);
126 spi_message_add_tail(xfers, &msg);
127 ret = spi_sync(st->us, &msg);
129 dev_err(&st->us->dev, "problem when reading 24 bit register 0x%02X",
133 *val = (st->rx[1] << 16) | (st->rx[2] << 8) | st->rx[3];
136 mutex_unlock(&st->buf_lock);
140 static ssize_t ade7754_read_8bit(struct device *dev,
141 struct device_attribute *attr,
146 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
148 ret = ade7754_spi_read_reg_8(dev, this_attr->address, &val);
152 return sprintf(buf, "%u\n", val);
155 static ssize_t ade7754_read_16bit(struct device *dev,
156 struct device_attribute *attr,
161 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
163 ret = ade7754_spi_read_reg_16(dev, this_attr->address, &val);
167 return sprintf(buf, "%u\n", val);
170 static ssize_t ade7754_read_24bit(struct device *dev,
171 struct device_attribute *attr,
176 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
178 ret = ade7754_spi_read_reg_24(dev, this_attr->address, &val);
182 return sprintf(buf, "%u\n", val & 0xFFFFFF);
185 static ssize_t ade7754_write_8bit(struct device *dev,
186 struct device_attribute *attr,
190 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
194 ret = strict_strtol(buf, 10, &val);
197 ret = ade7754_spi_write_reg_8(dev, this_attr->address, val);
200 return ret ? ret : len;
203 static ssize_t ade7754_write_16bit(struct device *dev,
204 struct device_attribute *attr,
208 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
212 ret = strict_strtol(buf, 10, &val);
215 ret = ade7754_spi_write_reg_16(dev, this_attr->address, val);
218 return ret ? ret : len;
221 static int ade7754_reset(struct device *dev)
225 ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val);
226 val |= 1 << 6; /* Software Chip Reset */
227 return ade7754_spi_write_reg_8(dev, ADE7754_OPMODE, val);
231 static ssize_t ade7754_write_reset(struct device *dev,
232 struct device_attribute *attr,
233 const char *buf, size_t len)
241 return ade7754_reset(dev);
246 static IIO_DEV_ATTR_AENERGY(ade7754_read_24bit, ADE7754_AENERGY);
247 static IIO_DEV_ATTR_LAENERGY(ade7754_read_24bit, ADE7754_LAENERGY);
248 static IIO_DEV_ATTR_VAENERGY(ade7754_read_24bit, ADE7754_VAENERGY);
249 static IIO_DEV_ATTR_LVAENERGY(ade7754_read_24bit, ADE7754_LVAENERGY);
250 static IIO_DEV_ATTR_VPEAK(S_IWUSR | S_IRUGO,
254 static IIO_DEV_ATTR_IPEAK(S_IWUSR | S_IRUGO,
258 static IIO_DEV_ATTR_APHCAL(S_IWUSR | S_IRUGO,
262 static IIO_DEV_ATTR_BPHCAL(S_IWUSR | S_IRUGO,
266 static IIO_DEV_ATTR_CPHCAL(S_IWUSR | S_IRUGO,
270 static IIO_DEV_ATTR_AAPOS(S_IWUSR | S_IRUGO,
274 static IIO_DEV_ATTR_BAPOS(S_IWUSR | S_IRUGO,
278 static IIO_DEV_ATTR_CAPOS(S_IWUSR | S_IRUGO,
282 static IIO_DEV_ATTR_WDIV(S_IWUSR | S_IRUGO,
286 static IIO_DEV_ATTR_VADIV(S_IWUSR | S_IRUGO,
290 static IIO_DEV_ATTR_CFNUM(S_IWUSR | S_IRUGO,
294 static IIO_DEV_ATTR_CFDEN(S_IWUSR | S_IRUGO,
298 static IIO_DEV_ATTR_ACTIVE_POWER_A_GAIN(S_IWUSR | S_IRUGO,
302 static IIO_DEV_ATTR_ACTIVE_POWER_B_GAIN(S_IWUSR | S_IRUGO,
306 static IIO_DEV_ATTR_ACTIVE_POWER_C_GAIN(S_IWUSR | S_IRUGO,
310 static IIO_DEV_ATTR_AIRMS(S_IRUGO,
314 static IIO_DEV_ATTR_BIRMS(S_IRUGO,
318 static IIO_DEV_ATTR_CIRMS(S_IRUGO,
322 static IIO_DEV_ATTR_AVRMS(S_IRUGO,
326 static IIO_DEV_ATTR_BVRMS(S_IRUGO,
330 static IIO_DEV_ATTR_CVRMS(S_IRUGO,
334 static IIO_DEV_ATTR_AIRMSOS(S_IRUGO,
338 static IIO_DEV_ATTR_BIRMSOS(S_IRUGO,
342 static IIO_DEV_ATTR_CIRMSOS(S_IRUGO,
346 static IIO_DEV_ATTR_AVRMSOS(S_IRUGO,
350 static IIO_DEV_ATTR_BVRMSOS(S_IRUGO,
354 static IIO_DEV_ATTR_CVRMSOS(S_IRUGO,
359 static int ade7754_set_irq(struct device *dev, bool enable)
363 ret = ade7754_spi_read_reg_16(dev, ADE7754_IRQEN, &irqen);
368 irqen |= 1 << 14; /* Enables an interrupt when a data is
369 present in the waveform register */
373 ret = ade7754_spi_write_reg_16(dev, ADE7754_IRQEN, irqen);
381 /* Power down the device */
382 static int ade7754_stop_device(struct device *dev)
386 ade7754_spi_read_reg_8(dev, ADE7754_OPMODE, &val);
387 val |= 7 << 3; /* ADE7754 powered down */
388 return ade7754_spi_write_reg_8(dev, ADE7754_OPMODE, val);
391 static int ade7754_initial_setup(struct iio_dev *indio_dev)
394 struct ade7754_state *st = iio_priv(indio_dev);
395 struct device *dev = &indio_dev->dev;
397 /* use low spi speed for init */
398 st->us->mode = SPI_MODE_3;
402 ret = ade7754_set_irq(dev, false);
404 dev_err(dev, "disable irq failed");
409 msleep(ADE7754_STARTUP_DELAY);
415 static ssize_t ade7754_read_frequency(struct device *dev,
416 struct device_attribute *attr,
422 ret = ade7754_spi_read_reg_8(dev,
429 sps = 26000 / (1 + t);
431 return sprintf(buf, "%d\n", sps);
434 static ssize_t ade7754_write_frequency(struct device *dev,
435 struct device_attribute *attr,
439 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
440 struct ade7754_state *st = iio_priv(indio_dev);
445 ret = strict_strtol(buf, 10, &val);
449 mutex_lock(&indio_dev->mlock);
456 st->us->max_speed_hz = ADE7754_SPI_SLOW;
458 st->us->max_speed_hz = ADE7754_SPI_FAST;
460 ret = ade7754_spi_read_reg_8(dev, ADE7754_WAVMODE, ®);
467 ret = ade7754_spi_write_reg_8(dev, ADE7754_WAVMODE, reg);
470 mutex_unlock(&indio_dev->mlock);
472 return ret ? ret : len;
474 static IIO_DEV_ATTR_TEMP_RAW(ade7754_read_8bit);
475 static IIO_CONST_ATTR(in_temp_offset, "129 C");
476 static IIO_CONST_ATTR(in_temp_scale, "4 C");
478 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
479 ade7754_read_frequency,
480 ade7754_write_frequency);
482 static IIO_DEV_ATTR_RESET(ade7754_write_reset);
484 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("26000 13000 65000 33000");
486 static struct attribute *ade7754_attributes[] = {
487 &iio_dev_attr_in_temp_raw.dev_attr.attr,
488 &iio_const_attr_in_temp_offset.dev_attr.attr,
489 &iio_const_attr_in_temp_scale.dev_attr.attr,
490 &iio_dev_attr_sampling_frequency.dev_attr.attr,
491 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
492 &iio_dev_attr_reset.dev_attr.attr,
493 &iio_dev_attr_aenergy.dev_attr.attr,
494 &iio_dev_attr_laenergy.dev_attr.attr,
495 &iio_dev_attr_vaenergy.dev_attr.attr,
496 &iio_dev_attr_lvaenergy.dev_attr.attr,
497 &iio_dev_attr_vpeak.dev_attr.attr,
498 &iio_dev_attr_ipeak.dev_attr.attr,
499 &iio_dev_attr_aphcal.dev_attr.attr,
500 &iio_dev_attr_bphcal.dev_attr.attr,
501 &iio_dev_attr_cphcal.dev_attr.attr,
502 &iio_dev_attr_aapos.dev_attr.attr,
503 &iio_dev_attr_bapos.dev_attr.attr,
504 &iio_dev_attr_capos.dev_attr.attr,
505 &iio_dev_attr_wdiv.dev_attr.attr,
506 &iio_dev_attr_vadiv.dev_attr.attr,
507 &iio_dev_attr_cfnum.dev_attr.attr,
508 &iio_dev_attr_cfden.dev_attr.attr,
509 &iio_dev_attr_active_power_a_gain.dev_attr.attr,
510 &iio_dev_attr_active_power_b_gain.dev_attr.attr,
511 &iio_dev_attr_active_power_c_gain.dev_attr.attr,
512 &iio_dev_attr_airms.dev_attr.attr,
513 &iio_dev_attr_birms.dev_attr.attr,
514 &iio_dev_attr_cirms.dev_attr.attr,
515 &iio_dev_attr_avrms.dev_attr.attr,
516 &iio_dev_attr_bvrms.dev_attr.attr,
517 &iio_dev_attr_cvrms.dev_attr.attr,
518 &iio_dev_attr_airmsos.dev_attr.attr,
519 &iio_dev_attr_birmsos.dev_attr.attr,
520 &iio_dev_attr_cirmsos.dev_attr.attr,
521 &iio_dev_attr_avrmsos.dev_attr.attr,
522 &iio_dev_attr_bvrmsos.dev_attr.attr,
523 &iio_dev_attr_cvrmsos.dev_attr.attr,
527 static const struct attribute_group ade7754_attribute_group = {
528 .attrs = ade7754_attributes,
531 static const struct iio_info ade7754_info = {
532 .attrs = &ade7754_attribute_group,
533 .driver_module = THIS_MODULE,
536 static int __devinit ade7754_probe(struct spi_device *spi)
539 struct ade7754_state *st;
540 struct iio_dev *indio_dev;
542 /* setup the industrialio driver allocated elements */
543 indio_dev = iio_device_alloc(sizeof(*st));
544 if (indio_dev == NULL) {
548 /* this is only used for removal purposes */
549 spi_set_drvdata(spi, indio_dev);
551 st = iio_priv(indio_dev);
553 mutex_init(&st->buf_lock);
555 indio_dev->name = spi->dev.driver->name;
556 indio_dev->dev.parent = &spi->dev;
557 indio_dev->info = &ade7754_info;
558 indio_dev->modes = INDIO_DIRECT_MODE;
560 /* Get the device into a sane initial state */
561 ret = ade7754_initial_setup(indio_dev);
564 ret = iio_device_register(indio_dev);
571 iio_device_free(indio_dev);
577 /* fixme, confirm ordering in this function */
578 static int ade7754_remove(struct spi_device *spi)
581 struct iio_dev *indio_dev = spi_get_drvdata(spi);
583 iio_device_unregister(indio_dev);
584 ret = ade7754_stop_device(&(indio_dev->dev));
588 iio_device_free(indio_dev);
595 static struct spi_driver ade7754_driver = {
598 .owner = THIS_MODULE,
600 .probe = ade7754_probe,
601 .remove = __devexit_p(ade7754_remove),
603 module_spi_driver(ade7754_driver);
605 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
606 MODULE_DESCRIPTION("Analog Devices ADE7754 Polyphase Multifunction Energy Metering IC Driver");
607 MODULE_LICENSE("GPL v2");
608 MODULE_ALIAS("spi:ad7754");