3 * Copyright (C) 2010-1011 Michael Hennerich, Analog Devices Inc.
5 * based on iio/adc/max1363
6 * Copyright (C) 2008-2010 Jonathan Cameron
8 * based on linux/drivers/i2c/chips/max123x
9 * Copyright (C) 2002-2004 Stefan Eletzhofer
11 * based on linux/drivers/acron/char/pcf8583.c
12 * Copyright (C) 2000 Russell King
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
20 * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
21 * ad7998 and similar chips.
25 #include <linux/interrupt.h>
26 #include <linux/device.h>
27 #include <linux/kernel.h>
28 #include <linux/sysfs.h>
29 #include <linux/i2c.h>
30 #include <linux/regulator/consumer.h>
31 #include <linux/slab.h>
32 #include <linux/types.h>
33 #include <linux/err.h>
34 #include <linux/module.h>
36 #include <linux/iio/iio.h>
37 #include <linux/iio/sysfs.h>
38 #include <linux/iio/events.h>
39 #include <linux/iio/buffer.h>
44 * ad799x register access by I2C
46 static int ad799x_i2c_read16(struct ad799x_state *st, u8 reg, u16 *data)
48 struct i2c_client *client = st->client;
51 ret = i2c_smbus_read_word_data(client, reg);
53 dev_err(&client->dev, "I2C read error\n");
57 *data = swab16((u16)ret);
62 static int ad799x_i2c_read8(struct ad799x_state *st, u8 reg, u8 *data)
64 struct i2c_client *client = st->client;
67 ret = i2c_smbus_read_byte_data(client, reg);
69 dev_err(&client->dev, "I2C read error\n");
78 static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data)
80 struct i2c_client *client = st->client;
83 ret = i2c_smbus_write_word_data(client, reg, swab16(data));
85 dev_err(&client->dev, "I2C write error\n");
90 static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data)
92 struct i2c_client *client = st->client;
95 ret = i2c_smbus_write_byte_data(client, reg, data);
97 dev_err(&client->dev, "I2C write error\n");
102 int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask)
104 return ad799x_i2c_write16(st, AD7998_CONF_REG,
105 st->config | (mask << AD799X_CHANNEL_SHIFT));
108 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
118 cmd = st->config | ((1 << ch) << AD799X_CHANNEL_SHIFT);
123 cmd = (1 << ch) << AD799X_CHANNEL_SHIFT;
127 cmd = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
133 ret = ad799x_i2c_read16(st, cmd, &rxbuf);
140 static int ad799x_read_raw(struct iio_dev *indio_dev,
141 struct iio_chan_spec const *chan,
147 struct ad799x_state *st = iio_priv(indio_dev);
148 unsigned int scale_uv;
151 case IIO_CHAN_INFO_RAW:
152 mutex_lock(&indio_dev->mlock);
153 if (iio_buffer_enabled(indio_dev))
156 ret = ad799x_scan_direct(st, chan->scan_index);
157 mutex_unlock(&indio_dev->mlock);
161 *val = (ret >> chan->scan_type.shift) &
162 RES_MASK(chan->scan_type.realbits);
164 case IIO_CHAN_INFO_SCALE:
165 scale_uv = (st->int_vref_mv * 1000) >> chan->scan_type.realbits;
166 *val = scale_uv / 1000;
167 *val2 = (scale_uv % 1000) * 1000;
168 return IIO_VAL_INT_PLUS_MICRO;
172 static const unsigned int ad7998_frequencies[] = {
173 [AD7998_CYC_DIS] = 0,
174 [AD7998_CYC_TCONF_32] = 15625,
175 [AD7998_CYC_TCONF_64] = 7812,
176 [AD7998_CYC_TCONF_128] = 3906,
177 [AD7998_CYC_TCONF_512] = 976,
178 [AD7998_CYC_TCONF_1024] = 488,
179 [AD7998_CYC_TCONF_2048] = 244,
181 static ssize_t ad799x_read_frequency(struct device *dev,
182 struct device_attribute *attr,
185 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
186 struct ad799x_state *st = iio_priv(indio_dev);
190 ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
194 val &= AD7998_CYC_MASK;
196 return sprintf(buf, "%u\n", ad7998_frequencies[val]);
199 static ssize_t ad799x_write_frequency(struct device *dev,
200 struct device_attribute *attr,
204 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
205 struct ad799x_state *st = iio_priv(indio_dev);
211 ret = strict_strtol(buf, 10, &val);
215 mutex_lock(&indio_dev->mlock);
216 ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
218 goto error_ret_mutex;
219 /* Wipe the bits clean */
220 t &= ~AD7998_CYC_MASK;
222 for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
223 if (val == ad7998_frequencies[i])
225 if (i == ARRAY_SIZE(ad7998_frequencies)) {
227 goto error_ret_mutex;
230 ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
233 mutex_unlock(&indio_dev->mlock);
235 return ret ? ret : len;
238 static int ad799x_read_event_config(struct iio_dev *indio_dev,
244 static const u8 ad799x_threshold_addresses[][2] = {
245 { AD7998_DATALOW_CH1_REG, AD7998_DATAHIGH_CH1_REG },
246 { AD7998_DATALOW_CH2_REG, AD7998_DATAHIGH_CH2_REG },
247 { AD7998_DATALOW_CH3_REG, AD7998_DATAHIGH_CH3_REG },
248 { AD7998_DATALOW_CH4_REG, AD7998_DATAHIGH_CH4_REG },
251 static int ad799x_write_event_value(struct iio_dev *indio_dev,
256 struct ad799x_state *st = iio_priv(indio_dev);
257 int direction = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
259 int number = IIO_EVENT_CODE_EXTRACT_CHAN(event_code);
261 mutex_lock(&indio_dev->mlock);
262 ret = ad799x_i2c_write16(st,
263 ad799x_threshold_addresses[number][direction],
265 mutex_unlock(&indio_dev->mlock);
270 static int ad799x_read_event_value(struct iio_dev *indio_dev,
275 struct ad799x_state *st = iio_priv(indio_dev);
276 int direction = !!(IIO_EVENT_CODE_EXTRACT_DIR(event_code) ==
278 int number = IIO_EVENT_CODE_EXTRACT_CHAN(event_code);
281 mutex_lock(&indio_dev->mlock);
282 ret = ad799x_i2c_read16(st,
283 ad799x_threshold_addresses[number][direction],
285 mutex_unlock(&indio_dev->mlock);
293 static ssize_t ad799x_read_channel_config(struct device *dev,
294 struct device_attribute *attr,
297 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
298 struct ad799x_state *st = iio_priv(indio_dev);
299 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
303 ret = ad799x_i2c_read16(st, this_attr->address, &val);
307 return sprintf(buf, "%d\n", val);
310 static ssize_t ad799x_write_channel_config(struct device *dev,
311 struct device_attribute *attr,
315 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
316 struct ad799x_state *st = iio_priv(indio_dev);
317 struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
322 ret = strict_strtol(buf, 10, &val);
326 mutex_lock(&indio_dev->mlock);
327 ret = ad799x_i2c_write16(st, this_attr->address, val);
328 mutex_unlock(&indio_dev->mlock);
330 return ret ? ret : len;
333 static irqreturn_t ad799x_event_handler(int irq, void *private)
335 struct iio_dev *indio_dev = private;
336 struct ad799x_state *st = iio_priv(private);
340 ret = ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status);
347 ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
349 for (i = 0; i < 8; i++) {
350 if (status & (1 << i))
351 iio_push_event(indio_dev,
353 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
357 IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
367 static IIO_DEVICE_ATTR(in_voltage0_thresh_both_hyst_raw,
369 ad799x_read_channel_config,
370 ad799x_write_channel_config,
371 AD7998_HYST_CH1_REG);
373 static IIO_DEVICE_ATTR(in_voltage1_thresh_both_hyst_raw,
375 ad799x_read_channel_config,
376 ad799x_write_channel_config,
377 AD7998_HYST_CH2_REG);
379 static IIO_DEVICE_ATTR(in_voltage2_thresh_both_hyst_raw,
381 ad799x_read_channel_config,
382 ad799x_write_channel_config,
383 AD7998_HYST_CH3_REG);
385 static IIO_DEVICE_ATTR(in_voltage3_thresh_both_hyst_raw,
387 ad799x_read_channel_config,
388 ad799x_write_channel_config,
389 AD7998_HYST_CH4_REG);
391 static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
392 ad799x_read_frequency,
393 ad799x_write_frequency);
394 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
396 static struct attribute *ad7993_4_7_8_event_attributes[] = {
397 &iio_dev_attr_in_voltage0_thresh_both_hyst_raw.dev_attr.attr,
398 &iio_dev_attr_in_voltage1_thresh_both_hyst_raw.dev_attr.attr,
399 &iio_dev_attr_in_voltage2_thresh_both_hyst_raw.dev_attr.attr,
400 &iio_dev_attr_in_voltage3_thresh_both_hyst_raw.dev_attr.attr,
401 &iio_dev_attr_sampling_frequency.dev_attr.attr,
402 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
406 static struct attribute_group ad7993_4_7_8_event_attrs_group = {
407 .attrs = ad7993_4_7_8_event_attributes,
411 static struct attribute *ad7992_event_attributes[] = {
412 &iio_dev_attr_in_voltage0_thresh_both_hyst_raw.dev_attr.attr,
413 &iio_dev_attr_in_voltage1_thresh_both_hyst_raw.dev_attr.attr,
414 &iio_dev_attr_sampling_frequency.dev_attr.attr,
415 &iio_const_attr_sampling_frequency_available.dev_attr.attr,
419 static struct attribute_group ad7992_event_attrs_group = {
420 .attrs = ad7992_event_attributes,
424 static const struct iio_info ad7991_info = {
425 .read_raw = &ad799x_read_raw,
426 .driver_module = THIS_MODULE,
429 static const struct iio_info ad7992_info = {
430 .read_raw = &ad799x_read_raw,
431 .event_attrs = &ad7992_event_attrs_group,
432 .read_event_config = &ad799x_read_event_config,
433 .read_event_value = &ad799x_read_event_value,
434 .write_event_value = &ad799x_write_event_value,
435 .driver_module = THIS_MODULE,
438 static const struct iio_info ad7993_4_7_8_info = {
439 .read_raw = &ad799x_read_raw,
440 .event_attrs = &ad7993_4_7_8_event_attrs_group,
441 .read_event_config = &ad799x_read_event_config,
442 .read_event_value = &ad799x_read_event_value,
443 .write_event_value = &ad799x_write_event_value,
444 .driver_module = THIS_MODULE,
447 #define AD799X_EV_MASK (IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_RISING) | \
448 IIO_EV_BIT(IIO_EV_TYPE_THRESH, IIO_EV_DIR_FALLING))
450 static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
457 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
459 .scan_type = IIO_ST('u', 12, 16, 0),
465 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
467 .scan_type = IIO_ST('u', 12, 16, 0),
473 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
475 .scan_type = IIO_ST('u', 12, 16, 0),
481 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
483 .scan_type = IIO_ST('u', 12, 16, 0),
485 [4] = IIO_CHAN_SOFT_TIMESTAMP(4),
489 .info = &ad7991_info,
497 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
499 .scan_type = IIO_ST('u', 10, 16, 2),
505 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
507 .scan_type = IIO_ST('u', 10, 16, 2),
513 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
515 .scan_type = IIO_ST('u', 10, 16, 2),
521 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
523 .scan_type = IIO_ST('u', 10, 16, 2),
525 [4] = IIO_CHAN_SOFT_TIMESTAMP(4),
529 .info = &ad7991_info,
537 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
539 .scan_type = IIO_ST('u', 8, 16, 4),
545 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
547 .scan_type = IIO_ST('u', 8, 16, 4),
553 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
555 .scan_type = IIO_ST('u', 8, 16, 4),
561 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
563 .scan_type = IIO_ST('u', 8, 16, 4),
565 [4] = IIO_CHAN_SOFT_TIMESTAMP(4),
569 .info = &ad7991_info,
577 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
579 .scan_type = IIO_ST('u', 12, 16, 0),
580 .event_mask = AD799X_EV_MASK,
586 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
588 .scan_type = IIO_ST('u', 12, 16, 0),
589 .event_mask = AD799X_EV_MASK,
591 [2] = IIO_CHAN_SOFT_TIMESTAMP(2),
595 .default_config = AD7998_ALERT_EN,
596 .info = &ad7992_info,
604 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
606 .scan_type = IIO_ST('u', 10, 16, 2),
607 .event_mask = AD799X_EV_MASK,
614 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
615 .scan_type = IIO_ST('u', 10, 16, 2),
616 .event_mask = AD799X_EV_MASK,
622 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
624 .scan_type = IIO_ST('u', 10, 16, 2),
625 .event_mask = AD799X_EV_MASK,
631 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
633 .scan_type = IIO_ST('u', 10, 16, 2),
634 .event_mask = AD799X_EV_MASK,
636 [4] = IIO_CHAN_SOFT_TIMESTAMP(4),
640 .default_config = AD7998_ALERT_EN,
641 .info = &ad7993_4_7_8_info,
649 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
651 .scan_type = IIO_ST('u', 12, 16, 0),
652 .event_mask = AD799X_EV_MASK,
658 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
660 .scan_type = IIO_ST('u', 12, 16, 0),
661 .event_mask = AD799X_EV_MASK,
667 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
669 .scan_type = IIO_ST('u', 12, 16, 0),
670 .event_mask = AD799X_EV_MASK,
676 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
678 .scan_type = IIO_ST('u', 12, 16, 0),
679 .event_mask = AD799X_EV_MASK,
681 [4] = IIO_CHAN_SOFT_TIMESTAMP(4),
685 .default_config = AD7998_ALERT_EN,
686 .info = &ad7993_4_7_8_info,
694 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
696 .scan_type = IIO_ST('u', 10, 16, 2),
697 .event_mask = AD799X_EV_MASK,
703 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
705 .scan_type = IIO_ST('u', 10, 16, 2),
706 .event_mask = AD799X_EV_MASK,
712 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
714 .scan_type = IIO_ST('u', 10, 16, 2),
715 .event_mask = AD799X_EV_MASK,
721 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
723 .scan_type = IIO_ST('u', 10, 16, 2),
724 .event_mask = AD799X_EV_MASK,
730 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
732 .scan_type = IIO_ST('u', 10, 16, 2),
738 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
740 .scan_type = IIO_ST('u', 10, 16, 2),
746 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
748 .scan_type = IIO_ST('u', 10, 16, 2),
754 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
756 .scan_type = IIO_ST('u', 10, 16, 2),
758 [8] = IIO_CHAN_SOFT_TIMESTAMP(8),
762 .default_config = AD7998_ALERT_EN,
763 .info = &ad7993_4_7_8_info,
771 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
773 .scan_type = IIO_ST('u', 12, 16, 0),
774 .event_mask = AD799X_EV_MASK,
780 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
782 .scan_type = IIO_ST('u', 12, 16, 0),
783 .event_mask = AD799X_EV_MASK,
789 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
791 .scan_type = IIO_ST('u', 12, 16, 0),
792 .event_mask = AD799X_EV_MASK,
798 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
800 .scan_type = IIO_ST('u', 12, 16, 0),
801 .event_mask = AD799X_EV_MASK,
807 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
809 .scan_type = IIO_ST('u', 12, 16, 0),
815 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
817 .scan_type = IIO_ST('u', 12, 16, 0),
823 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
825 .scan_type = IIO_ST('u', 12, 16, 0),
831 .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT,
833 .scan_type = IIO_ST('u', 12, 16, 0),
835 [8] = IIO_CHAN_SOFT_TIMESTAMP(8),
839 .default_config = AD7998_ALERT_EN,
840 .info = &ad7993_4_7_8_info,
844 static int __devinit ad799x_probe(struct i2c_client *client,
845 const struct i2c_device_id *id)
848 struct ad799x_platform_data *pdata = client->dev.platform_data;
849 struct ad799x_state *st;
850 struct iio_dev *indio_dev = iio_device_alloc(sizeof(*st));
852 if (indio_dev == NULL)
855 st = iio_priv(indio_dev);
856 /* this is only used for device removal purposes */
857 i2c_set_clientdata(client, indio_dev);
859 st->id = id->driver_data;
860 st->chip_info = &ad799x_chip_info_tbl[st->id];
861 st->config = st->chip_info->default_config;
863 /* TODO: Add pdata options for filtering and bit delay */
866 st->int_vref_mv = pdata->vref_mv;
868 st->int_vref_mv = st->chip_info->int_vref_mv;
870 st->reg = regulator_get(&client->dev, "vcc");
871 if (!IS_ERR(st->reg)) {
872 ret = regulator_enable(st->reg);
878 indio_dev->dev.parent = &client->dev;
879 indio_dev->name = id->name;
880 indio_dev->info = st->chip_info->info;
882 indio_dev->modes = INDIO_DIRECT_MODE;
883 indio_dev->channels = st->chip_info->channel;
884 indio_dev->num_channels = st->chip_info->num_channels;
886 ret = ad799x_register_ring_funcs_and_init(indio_dev);
888 goto error_disable_reg;
890 ret = iio_buffer_register(indio_dev,
892 indio_dev->num_channels);
894 goto error_cleanup_ring;
896 if (client->irq > 0) {
897 ret = request_threaded_irq(client->irq,
899 ad799x_event_handler,
900 IRQF_TRIGGER_FALLING |
905 goto error_cleanup_ring;
907 ret = iio_device_register(indio_dev);
914 free_irq(client->irq, indio_dev);
916 ad799x_ring_cleanup(indio_dev);
918 if (!IS_ERR(st->reg))
919 regulator_disable(st->reg);
921 if (!IS_ERR(st->reg))
922 regulator_put(st->reg);
923 iio_device_free(indio_dev);
928 static __devexit int ad799x_remove(struct i2c_client *client)
930 struct iio_dev *indio_dev = i2c_get_clientdata(client);
931 struct ad799x_state *st = iio_priv(indio_dev);
933 iio_device_unregister(indio_dev);
935 free_irq(client->irq, indio_dev);
937 iio_buffer_unregister(indio_dev);
938 ad799x_ring_cleanup(indio_dev);
939 if (!IS_ERR(st->reg)) {
940 regulator_disable(st->reg);
941 regulator_put(st->reg);
943 iio_device_free(indio_dev);
948 static const struct i2c_device_id ad799x_id[] = {
949 { "ad7991", ad7991 },
950 { "ad7995", ad7995 },
951 { "ad7999", ad7999 },
952 { "ad7992", ad7992 },
953 { "ad7993", ad7993 },
954 { "ad7994", ad7994 },
955 { "ad7997", ad7997 },
956 { "ad7998", ad7998 },
960 MODULE_DEVICE_TABLE(i2c, ad799x_id);
962 static struct i2c_driver ad799x_driver = {
966 .probe = ad799x_probe,
967 .remove = __devexit_p(ad799x_remove),
968 .id_table = ad799x_id,
970 module_i2c_driver(ad799x_driver);
972 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
973 MODULE_DESCRIPTION("Analog Devices AD799x ADC");
974 MODULE_LICENSE("GPL v2");