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_w8r16(st->us, ADE7759_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 ade7759_spi_read_reg_40(struct device *dev,
106 struct spi_message msg;
107 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
108 struct ade7759_state *st = iio_priv(indio_dev);
110 struct spi_transfer xfers[] = {
119 mutex_lock(&st->buf_lock);
120 st->tx[0] = ADE7759_READ_REG(reg_address);
121 memset(&st->tx[1], 0 , 5);
123 spi_message_init(&msg);
124 spi_message_add_tail(xfers, &msg);
125 ret = spi_sync(st->us, &msg);
127 dev_err(&st->us->dev, "problem when reading 40 bit register 0x%02X",
131 *val = ((u64)st->rx[1] << 32) | (st->rx[2] << 24) |
132 (st->rx[3] << 16) | (st->rx[4] << 8) | st->rx[5];
135 mutex_unlock(&st->buf_lock);
139 static ssize_t ade7759_read_8bit(struct device *dev,
140 struct device_attribute *attr,
145 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
147 ret = ade7759_spi_read_reg_8(dev, this_attr->address, &val);
151 return sprintf(buf, "%u\n", val);
154 static ssize_t ade7759_read_16bit(struct device *dev,
155 struct device_attribute *attr,
160 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
162 ret = ade7759_spi_read_reg_16(dev, this_attr->address, &val);
166 return sprintf(buf, "%u\n", val);
169 static ssize_t ade7759_read_40bit(struct device *dev,
170 struct device_attribute *attr,
175 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
177 ret = ade7759_spi_read_reg_40(dev, this_attr->address, &val);
181 return sprintf(buf, "%llu\n", val);
184 static ssize_t ade7759_write_8bit(struct device *dev,
185 struct device_attribute *attr,
189 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
193 ret = strict_strtol(buf, 10, &val);
196 ret = ade7759_spi_write_reg_8(dev, this_attr->address, val);
199 return ret ? ret : len;
202 static ssize_t ade7759_write_16bit(struct device *dev,
203 struct device_attribute *attr,
207 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
211 ret = strict_strtol(buf, 10, &val);
214 ret = ade7759_spi_write_reg_16(dev, this_attr->address, val);
217 return ret ? ret : len;
220 static int ade7759_reset(struct device *dev)
224 ade7759_spi_read_reg_16(dev,
227 val |= 1 << 6; /* Software Chip Reset */
228 ret = ade7759_spi_write_reg_16(dev,
235 static ssize_t ade7759_write_reset(struct device *dev,
236 struct device_attribute *attr,
237 const char *buf, size_t len)
245 return ade7759_reset(dev);
250 static IIO_DEV_ATTR_AENERGY(ade7759_read_40bit, ADE7759_AENERGY);
251 static IIO_DEV_ATTR_CFDEN(S_IWUSR | S_IRUGO,
255 static IIO_DEV_ATTR_CFNUM(S_IWUSR | S_IRUGO,
259 static IIO_DEV_ATTR_CHKSUM(ade7759_read_8bit, ADE7759_CHKSUM);
260 static IIO_DEV_ATTR_PHCAL(S_IWUSR | S_IRUGO,
264 static IIO_DEV_ATTR_APOS(S_IWUSR | S_IRUGO,
268 static IIO_DEV_ATTR_SAGCYC(S_IWUSR | S_IRUGO,
272 static IIO_DEV_ATTR_SAGLVL(S_IWUSR | S_IRUGO,
276 static IIO_DEV_ATTR_LINECYC(S_IWUSR | S_IRUGO,
280 static IIO_DEV_ATTR_LENERGY(ade7759_read_40bit, ADE7759_LENERGY);
281 static IIO_DEV_ATTR_PGA_GAIN(S_IWUSR | S_IRUGO,
285 static IIO_DEV_ATTR_ACTIVE_POWER_GAIN(S_IWUSR | S_IRUGO,
289 static IIO_DEV_ATTR_CH_OFF(1, S_IWUSR | S_IRUGO,
293 static IIO_DEV_ATTR_CH_OFF(2, S_IWUSR | S_IRUGO,
298 static int ade7759_set_irq(struct device *dev, bool enable)
302 ret = ade7759_spi_read_reg_8(dev, ADE7759_IRQEN, &irqen);
307 irqen |= 1 << 3; /* Enables an interrupt when a data is
308 present in the waveform register */
312 ret = ade7759_spi_write_reg_8(dev, ADE7759_IRQEN, irqen);
318 /* Power down the device */
319 static int ade7759_stop_device(struct device *dev)
323 ade7759_spi_read_reg_16(dev,
326 val |= 1 << 4; /* AD converters can be turned off */
328 return ade7759_spi_write_reg_16(dev, ADE7759_MODE, val);
331 static int ade7759_initial_setup(struct iio_dev *indio_dev)
334 struct ade7759_state *st = iio_priv(indio_dev);
335 struct device *dev = &indio_dev->dev;
337 /* use low spi speed for init */
338 st->us->mode = SPI_MODE_3;
342 ret = ade7759_set_irq(dev, false);
344 dev_err(dev, "disable irq failed");
349 msleep(ADE7759_STARTUP_DELAY);
355 static ssize_t ade7759_read_frequency(struct device *dev,
356 struct device_attribute *attr,
362 ret = ade7759_spi_read_reg_16(dev,
369 sps = 27900 / (1 + t);
371 return sprintf(buf, "%d\n", sps);
374 static ssize_t ade7759_write_frequency(struct device *dev,
375 struct device_attribute *attr,
379 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
380 struct ade7759_state *st = iio_priv(indio_dev);
385 ret = strict_strtol(buf, 10, &val);
391 mutex_lock(&indio_dev->mlock);
398 st->us->max_speed_hz = ADE7759_SPI_SLOW;
400 st->us->max_speed_hz = ADE7759_SPI_FAST;
402 ret = ade7759_spi_read_reg_16(dev, ADE7759_MODE, ®);
409 ret = ade7759_spi_write_reg_16(dev, ADE7759_MODE, reg);
412 mutex_unlock(&indio_dev->mlock);
414 return ret ? ret : len;
416 static IIO_DEV_ATTR_TEMP_RAW(ade7759_read_8bit);
417 static IIO_CONST_ATTR(in_temp_offset, "70 C");
418 static IIO_CONST_ATTR(in_temp_scale, "1 C");
420 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
421 ade7759_read_frequency,
422 ade7759_write_frequency);
424 static IIO_DEV_ATTR_RESET(ade7759_write_reset);
426 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("27900 14000 7000 3500");
428 static struct attribute *ade7759_attributes[] = {
429 &iio_dev_attr_in_temp_raw.dev_attr.attr,
430 &iio_const_attr_in_temp_offset.dev_attr.attr,
431 &iio_const_attr_in_temp_scale.dev_attr.attr,
432 &iio_dev_attr_sampling_frequency.dev_attr.attr,
433 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
434 &iio_dev_attr_reset.dev_attr.attr,
435 &iio_dev_attr_phcal.dev_attr.attr,
436 &iio_dev_attr_cfden.dev_attr.attr,
437 &iio_dev_attr_aenergy.dev_attr.attr,
438 &iio_dev_attr_cfnum.dev_attr.attr,
439 &iio_dev_attr_apos.dev_attr.attr,
440 &iio_dev_attr_sagcyc.dev_attr.attr,
441 &iio_dev_attr_saglvl.dev_attr.attr,
442 &iio_dev_attr_linecyc.dev_attr.attr,
443 &iio_dev_attr_lenergy.dev_attr.attr,
444 &iio_dev_attr_chksum.dev_attr.attr,
445 &iio_dev_attr_pga_gain.dev_attr.attr,
446 &iio_dev_attr_active_power_gain.dev_attr.attr,
447 &iio_dev_attr_choff_1.dev_attr.attr,
448 &iio_dev_attr_choff_2.dev_attr.attr,
452 static const struct attribute_group ade7759_attribute_group = {
453 .attrs = ade7759_attributes,
456 static const struct iio_info ade7759_info = {
457 .attrs = &ade7759_attribute_group,
458 .driver_module = THIS_MODULE,
461 static int __devinit ade7759_probe(struct spi_device *spi)
464 struct ade7759_state *st;
465 struct iio_dev *indio_dev;
467 /* setup the industrialio driver allocated elements */
468 indio_dev = iio_device_alloc(sizeof(*st));
469 if (indio_dev == NULL) {
473 /* this is only used for removal purposes */
474 spi_set_drvdata(spi, indio_dev);
476 st = iio_priv(indio_dev);
478 mutex_init(&st->buf_lock);
479 indio_dev->name = spi->dev.driver->name;
480 indio_dev->dev.parent = &spi->dev;
481 indio_dev->info = &ade7759_info;
482 indio_dev->modes = INDIO_DIRECT_MODE;
484 /* Get the device into a sane initial state */
485 ret = ade7759_initial_setup(indio_dev);
489 ret = iio_device_register(indio_dev);
496 iio_device_free(indio_dev);
501 /* fixme, confirm ordering in this function */
502 static int ade7759_remove(struct spi_device *spi)
505 struct iio_dev *indio_dev = spi_get_drvdata(spi);
507 iio_device_unregister(indio_dev);
508 ret = ade7759_stop_device(&(indio_dev->dev));
512 iio_device_free(indio_dev);
518 static struct spi_driver ade7759_driver = {
521 .owner = THIS_MODULE,
523 .probe = ade7759_probe,
524 .remove = __devexit_p(ade7759_remove),
526 module_spi_driver(ade7759_driver);
528 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
529 MODULE_DESCRIPTION("Analog Devices ADE7759 Active Energy Metering IC Driver");
530 MODULE_LICENSE("GPL v2");
531 MODULE_ALIAS("spi:ad7759");