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 ret
= ade7759_spi_read_reg_16(dev
,
227 val
|= BIT(6); /* Software Chip Reset */
228 return ade7759_spi_write_reg_16(dev
,
233 static IIO_DEV_ATTR_AENERGY(ade7759_read_40bit
, ADE7759_AENERGY
);
234 static IIO_DEV_ATTR_CFDEN(S_IWUSR
| S_IRUGO
,
238 static IIO_DEV_ATTR_CFNUM(S_IWUSR
| S_IRUGO
,
242 static IIO_DEV_ATTR_CHKSUM(ade7759_read_8bit
, ADE7759_CHKSUM
);
243 static IIO_DEV_ATTR_PHCAL(S_IWUSR
| S_IRUGO
,
247 static IIO_DEV_ATTR_APOS(S_IWUSR
| S_IRUGO
,
251 static IIO_DEV_ATTR_SAGCYC(S_IWUSR
| S_IRUGO
,
255 static IIO_DEV_ATTR_SAGLVL(S_IWUSR
| S_IRUGO
,
259 static IIO_DEV_ATTR_LINECYC(S_IWUSR
| S_IRUGO
,
263 static IIO_DEV_ATTR_LENERGY(ade7759_read_40bit
, ADE7759_LENERGY
);
264 static IIO_DEV_ATTR_PGA_GAIN(S_IWUSR
| S_IRUGO
,
268 static IIO_DEV_ATTR_ACTIVE_POWER_GAIN(S_IWUSR
| S_IRUGO
,
272 static IIO_DEV_ATTR_CH_OFF(1, S_IWUSR
| S_IRUGO
,
276 static IIO_DEV_ATTR_CH_OFF(2, S_IWUSR
| S_IRUGO
,
281 static int ade7759_set_irq(struct device
*dev
, bool enable
)
286 ret
= ade7759_spi_read_reg_8(dev
, ADE7759_IRQEN
, &irqen
);
291 irqen
|= BIT(3); /* Enables an interrupt when a data is
292 present in the waveform register */
296 ret
= ade7759_spi_write_reg_8(dev
, ADE7759_IRQEN
, irqen
);
302 /* Power down the device */
303 static int ade7759_stop_device(struct device
*dev
)
308 ret
= ade7759_spi_read_reg_16(dev
,
312 dev_err(dev
, "unable to power down the device, error: %d\n",
317 val
|= BIT(4); /* AD converters can be turned off */
319 return ade7759_spi_write_reg_16(dev
, ADE7759_MODE
, val
);
322 static int ade7759_initial_setup(struct iio_dev
*indio_dev
)
325 struct ade7759_state
*st
= iio_priv(indio_dev
);
326 struct device
*dev
= &indio_dev
->dev
;
328 /* use low spi speed for init */
329 st
->us
->mode
= SPI_MODE_3
;
333 ret
= ade7759_set_irq(dev
, false);
335 dev_err(dev
, "disable irq failed");
340 msleep(ADE7759_STARTUP_DELAY
);
346 static ssize_t
ade7759_read_frequency(struct device
*dev
,
347 struct device_attribute
*attr
,
354 ret
= ade7759_spi_read_reg_16(dev
,
361 sps
= 27900 / (1 + t
);
363 return sprintf(buf
, "%d\n", sps
);
366 static ssize_t
ade7759_write_frequency(struct device
*dev
,
367 struct device_attribute
*attr
,
371 struct iio_dev
*indio_dev
= dev_to_iio_dev(dev
);
372 struct ade7759_state
*st
= iio_priv(indio_dev
);
377 ret
= kstrtou16(buf
, 10, &val
);
383 mutex_lock(&indio_dev
->mlock
);
390 st
->us
->max_speed_hz
= ADE7759_SPI_SLOW
;
392 st
->us
->max_speed_hz
= ADE7759_SPI_FAST
;
394 ret
= ade7759_spi_read_reg_16(dev
, ADE7759_MODE
, ®
);
401 ret
= ade7759_spi_write_reg_16(dev
, ADE7759_MODE
, reg
);
404 mutex_unlock(&indio_dev
->mlock
);
406 return ret
? ret
: len
;
408 static IIO_DEV_ATTR_TEMP_RAW(ade7759_read_8bit
);
409 static IIO_CONST_ATTR(in_temp_offset
, "70 C");
410 static IIO_CONST_ATTR(in_temp_scale
, "1 C");
412 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR
| S_IRUGO
,
413 ade7759_read_frequency
,
414 ade7759_write_frequency
);
416 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("27900 14000 7000 3500");
418 static struct attribute
*ade7759_attributes
[] = {
419 &iio_dev_attr_in_temp_raw
.dev_attr
.attr
,
420 &iio_const_attr_in_temp_offset
.dev_attr
.attr
,
421 &iio_const_attr_in_temp_scale
.dev_attr
.attr
,
422 &iio_dev_attr_sampling_frequency
.dev_attr
.attr
,
423 &iio_const_attr_sampling_frequency_available
.dev_attr
.attr
,
424 &iio_dev_attr_phcal
.dev_attr
.attr
,
425 &iio_dev_attr_cfden
.dev_attr
.attr
,
426 &iio_dev_attr_aenergy
.dev_attr
.attr
,
427 &iio_dev_attr_cfnum
.dev_attr
.attr
,
428 &iio_dev_attr_apos
.dev_attr
.attr
,
429 &iio_dev_attr_sagcyc
.dev_attr
.attr
,
430 &iio_dev_attr_saglvl
.dev_attr
.attr
,
431 &iio_dev_attr_linecyc
.dev_attr
.attr
,
432 &iio_dev_attr_lenergy
.dev_attr
.attr
,
433 &iio_dev_attr_chksum
.dev_attr
.attr
,
434 &iio_dev_attr_pga_gain
.dev_attr
.attr
,
435 &iio_dev_attr_active_power_gain
.dev_attr
.attr
,
436 &iio_dev_attr_choff_1
.dev_attr
.attr
,
437 &iio_dev_attr_choff_2
.dev_attr
.attr
,
441 static const struct attribute_group ade7759_attribute_group
= {
442 .attrs
= ade7759_attributes
,
445 static const struct iio_info ade7759_info
= {
446 .attrs
= &ade7759_attribute_group
,
447 .driver_module
= THIS_MODULE
,
450 static int ade7759_probe(struct spi_device
*spi
)
453 struct ade7759_state
*st
;
454 struct iio_dev
*indio_dev
;
456 /* setup the industrialio driver allocated elements */
457 indio_dev
= devm_iio_device_alloc(&spi
->dev
, sizeof(*st
));
460 /* this is only used for removal purposes */
461 spi_set_drvdata(spi
, indio_dev
);
463 st
= iio_priv(indio_dev
);
465 mutex_init(&st
->buf_lock
);
466 indio_dev
->name
= spi
->dev
.driver
->name
;
467 indio_dev
->dev
.parent
= &spi
->dev
;
468 indio_dev
->info
= &ade7759_info
;
469 indio_dev
->modes
= INDIO_DIRECT_MODE
;
471 /* Get the device into a sane initial state */
472 ret
= ade7759_initial_setup(indio_dev
);
476 return iio_device_register(indio_dev
);
479 /* fixme, confirm ordering in this function */
480 static int ade7759_remove(struct spi_device
*spi
)
482 struct iio_dev
*indio_dev
= spi_get_drvdata(spi
);
484 iio_device_unregister(indio_dev
);
485 ade7759_stop_device(&indio_dev
->dev
);
490 static struct spi_driver ade7759_driver
= {
493 .owner
= THIS_MODULE
,
495 .probe
= ade7759_probe
,
496 .remove
= ade7759_remove
,
498 module_spi_driver(ade7759_driver
);
500 MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
501 MODULE_DESCRIPTION("Analog Devices ADE7759 Active Energy Metering IC Driver");
502 MODULE_LICENSE("GPL v2");
503 MODULE_ALIAS("spi:ad7759");