--- /dev/null
+/*
+ * iio/adc/ad799x.c
+ * Copyright (C) 2010 Michael Hennerich, Analog Devices Inc.
+ *
+ * based on iio/adc/max1363
+ * Copyright (C) 2008-2010 Jonathan Cameron
+ *
+ * based on linux/drivers/i2c/chips/max123x
+ * Copyright (C) 2002-2004 Stefan Eletzhofer
+ *
+ * based on linux/drivers/acron/char/pcf8583.c
+ * Copyright (C) 2000 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * ad799x.c
+ *
+ * Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
+ * ad7998 and similar chips.
+ *
+ */
+
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/sysfs.h>
+#include <linux/list.h>
+#include <linux/i2c.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/err.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+
+#include "../ring_generic.h"
+#include "adc.h"
+#include "ad799x.h"
+
+/*
+ * ad799x register access by I2C
+ */
+static int ad799x_i2c_read16(struct ad799x_state *st, u8 reg, u16 *data)
+{
+ struct i2c_client *client = st->client;
+ int ret = 0;
+
+ ret = i2c_smbus_read_word_data(client, reg);
+ if (ret < 0) {
+ dev_err(&client->dev, "I2C read error\n");
+ return ret;
+ }
+
+ *data = swab16((u16)ret);
+
+ return 0;
+}
+
+static int ad799x_i2c_read8(struct ad799x_state *st, u8 reg, u8 *data)
+{
+ struct i2c_client *client = st->client;
+ int ret = 0;
+
+ ret = i2c_smbus_read_word_data(client, reg);
+ if (ret < 0) {
+ dev_err(&client->dev, "I2C read error\n");
+ return ret;
+ }
+
+ *data = ret;
+
+ return 0;
+}
+
+static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data)
+{
+ struct i2c_client *client = st->client;
+ int ret = 0;
+
+ ret = i2c_smbus_write_word_data(client, reg, swab16(data));
+ if (ret < 0)
+ dev_err(&client->dev, "I2C write error\n");
+
+ return ret;
+}
+
+static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data)
+{
+ struct i2c_client *client = st->client;
+ int ret = 0;
+
+ ret = i2c_smbus_write_byte_data(client, reg, data);
+ if (ret < 0)
+ dev_err(&client->dev, "I2C write error\n");
+
+ return ret;
+}
+
+static int ad799x_scan_el_set_state(struct iio_scan_el *scan_el,
+ struct iio_dev *indio_dev,
+ bool state)
+{
+ struct ad799x_state *st = indio_dev->dev_data;
+ return ad799x_set_scan_mode(st, st->indio_dev->ring->scan_mask);
+}
+
+/* Here we claim all are 16 bits. This currently does no harm and saves
+ * us a lot of scan element listings */
+
+#define AD799X_SCAN_EL(number) \
+ IIO_SCAN_EL_C(in##number, number, 0, ad799x_scan_el_set_state);
+
+static AD799X_SCAN_EL(0);
+static AD799X_SCAN_EL(1);
+static AD799X_SCAN_EL(2);
+static AD799X_SCAN_EL(3);
+static AD799X_SCAN_EL(4);
+static AD799X_SCAN_EL(5);
+static AD799X_SCAN_EL(6);
+static AD799X_SCAN_EL(7);
+
+static ssize_t ad799x_show_precision(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+ return sprintf(buf, "%d\n", st->chip_info->bits);
+}
+
+static IIO_DEVICE_ATTR(in_precision, S_IRUGO, ad799x_show_precision,
+ NULL, 0);
+
+static int ad7991_5_9_set_scan_mode(struct ad799x_state *st, unsigned mask)
+{
+ return i2c_smbus_write_byte(st->client,
+ st->config | (mask << AD799X_CHANNEL_SHIFT));
+}
+
+static int ad7992_3_4_set_scan_mode(struct ad799x_state *st, unsigned mask)
+{
+ return ad799x_i2c_write8(st, AD7998_CONF_REG,
+ st->config | (mask << AD799X_CHANNEL_SHIFT));
+}
+
+static int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask)
+{
+ return ad799x_i2c_write16(st, AD7998_CONF_REG,
+ st->config | (mask << AD799X_CHANNEL_SHIFT));
+}
+
+int ad799x_set_scan_mode(struct ad799x_state *st, unsigned mask)
+{
+ int ret;
+
+ if (st->chip_info->ad799x_set_scan_mode != NULL) {
+ ret = st->chip_info->ad799x_set_scan_mode(st, mask);
+ return (ret > 0) ? 0 : ret;
+ }
+
+ return 0;
+}
+
+static ssize_t ad799x_read_single_channel(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+ struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ int ret = 0, len = 0;
+ u32 data ;
+ u16 rxbuf[1];
+ u8 cmd;
+ long mask;
+
+ mutex_lock(&dev_info->mlock);
+ mask = 1 << this_attr->address;
+ /* If ring buffer capture is occuring, query the buffer */
+ if (iio_ring_enabled(dev_info)) {
+ data = ad799x_single_channel_from_ring(st, mask);
+ if (data < 0) {
+ ret = data;
+ goto error_ret;
+ }
+ } else {
+ switch (st->id) {
+ case ad7991:
+ case ad7995:
+ case ad7999:
+ cmd = st->config | (mask << AD799X_CHANNEL_SHIFT);
+ break;
+ case ad7992:
+ case ad7993:
+ case ad7994:
+ cmd = mask << AD799X_CHANNEL_SHIFT;
+ break;
+ case ad7997:
+ case ad7998:
+ cmd = (this_attr->address <<
+ AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
+ break;
+ default:
+ cmd = 0;
+
+ }
+ ret = ad799x_i2c_read16(st, cmd, rxbuf);
+ if (ret < 0)
+ goto error_ret;
+
+ data = rxbuf[0] & 0xFFF;
+ }
+
+ /* Pretty print the result */
+ len = sprintf(buf, "%u\n", data);
+
+error_ret:
+ mutex_unlock(&dev_info->mlock);
+ return ret ? ret : len;
+}
+
+static ssize_t ad799x_read_frequency(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+
+ int ret, len = 0;
+ u8 val;
+ ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
+ if (ret)
+ return ret;
+
+ val &= AD7998_CYC_MASK;
+
+ switch (val) {
+ case AD7998_CYC_DIS:
+ len = sprintf(buf, "0\n");
+ break;
+ case AD7998_CYC_TCONF_32:
+ len = sprintf(buf, "15625\n");
+ break;
+ case AD7998_CYC_TCONF_64:
+ len = sprintf(buf, "7812\n");
+ break;
+ case AD7998_CYC_TCONF_128:
+ len = sprintf(buf, "3906\n");
+ break;
+ case AD7998_CYC_TCONF_256:
+ len = sprintf(buf, "1953\n");
+ break;
+ case AD7998_CYC_TCONF_512:
+ len = sprintf(buf, "976\n");
+ break;
+ case AD7998_CYC_TCONF_1024:
+ len = sprintf(buf, "488\n");
+ break;
+ case AD7998_CYC_TCONF_2048:
+ len = sprintf(buf, "244\n");
+ break;
+ }
+ return len;
+}
+
+static ssize_t ad799x_write_frequency(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+
+ long val;
+ int ret;
+ u8 t;
+
+ ret = strict_strtol(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ mutex_lock(&dev_info->mlock);
+ ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
+ if (ret)
+ goto error_ret_mutex;
+ /* Wipe the bits clean */
+ t &= ~AD7998_CYC_MASK;
+
+ switch (val) {
+ case 15625:
+ t |= AD7998_CYC_TCONF_32;
+ break;
+ case 7812:
+ t |= AD7998_CYC_TCONF_64;
+ break;
+ case 3906:
+ t |= AD7998_CYC_TCONF_128;
+ break;
+ case 1953:
+ t |= AD7998_CYC_TCONF_256;
+ break;
+ case 976:
+ t |= AD7998_CYC_TCONF_512;
+ break;
+ case 488:
+ t |= AD7998_CYC_TCONF_1024;
+ break;
+ case 244:
+ t |= AD7998_CYC_TCONF_2048;
+ break;
+ case 0:
+ t |= AD7998_CYC_DIS;
+ break;
+ default:
+ ret = -EINVAL;
+ goto error_ret_mutex;
+ }
+
+ ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
+
+error_ret_mutex:
+ mutex_unlock(&dev_info->mlock);
+
+ return ret ? ret : len;
+}
+
+
+static ssize_t ad799x_read_channel_config(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+ struct iio_event_attr *this_attr = to_iio_event_attr(attr);
+
+ int ret;
+ u16 val;
+ ret = ad799x_i2c_read16(st, this_attr->mask, &val);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t ad799x_write_channel_config(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+ struct iio_event_attr *this_attr = to_iio_event_attr(attr);
+
+ long val;
+ int ret;
+
+ ret = strict_strtol(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ mutex_lock(&dev_info->mlock);
+ ret = ad799x_i2c_write16(st, this_attr->mask, val);
+ mutex_unlock(&dev_info->mlock);
+
+ return ret ? ret : len;
+}
+
+static void ad799x_interrupt_bh(struct work_struct *work_s)
+{
+ struct ad799x_state *st = container_of(work_s,
+ struct ad799x_state, work_thresh);
+ u8 status;
+ int i;
+
+ if (ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status))
+ goto err_out;
+
+ if (!status)
+ goto err_out;
+
+ ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
+
+ for (i = 0; i < 8; i++) {
+ if (status & (1 << i))
+ iio_push_event(st->indio_dev, 0,
+ i & 0x1 ?
+ IIO_EVENT_CODE_IN_HIGH_THRESH(i >> 1) :
+ IIO_EVENT_CODE_IN_LOW_THRESH(i >> 1),
+ st->last_timestamp);
+ }
+
+err_out:
+ enable_irq(st->client->irq);
+}
+
+static int ad799x_interrupt(struct iio_dev *dev_info,
+ int index,
+ s64 timestamp,
+ int no_test)
+{
+ struct ad799x_state *st = dev_info->dev_data;
+
+ st->last_timestamp = timestamp;
+ schedule_work(&st->work_thresh);
+ return 0;
+}
+
+IIO_EVENT_SH(ad799x, &ad799x_interrupt);
+
+/* Direct read attribtues */
+static IIO_DEV_ATTR_IN_RAW(0, ad799x_read_single_channel, 0);
+static IIO_DEV_ATTR_IN_RAW(1, ad799x_read_single_channel, 1);
+static IIO_DEV_ATTR_IN_RAW(2, ad799x_read_single_channel, 2);
+static IIO_DEV_ATTR_IN_RAW(3, ad799x_read_single_channel, 3);
+static IIO_DEV_ATTR_IN_RAW(4, ad799x_read_single_channel, 4);
+static IIO_DEV_ATTR_IN_RAW(5, ad799x_read_single_channel, 5);
+static IIO_DEV_ATTR_IN_RAW(6, ad799x_read_single_channel, 6);
+static IIO_DEV_ATTR_IN_RAW(7, ad799x_read_single_channel, 7);
+
+static ssize_t ad799x_show_scale(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ /* Driver currently only support internal vref */
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+ /* Corresponds to Vref / 2^(bits) */
+
+ if ((1 << (st->chip_info->bits + 1))
+ > st->int_vref_mv)
+ return sprintf(buf, "0.5\n");
+ else
+ return sprintf(buf, "%d\n",
+ st->int_vref_mv >> st->chip_info->bits);
+}
+
+static IIO_DEVICE_ATTR(in_scale, S_IRUGO, ad799x_show_scale, NULL, 0);
+
+static ssize_t ad799x_show_name(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad799x_state *st = iio_dev_get_devdata(dev_info);
+ return sprintf(buf, "%s\n", st->client->name);
+}
+
+static IIO_DEVICE_ATTR(name, S_IRUGO, ad799x_show_name, NULL, 0);
+
+static struct attribute *ad7991_5_9_3_4_device_attrs[] = {
+ &iio_dev_attr_in0_raw.dev_attr.attr,
+ &iio_dev_attr_in1_raw.dev_attr.attr,
+ &iio_dev_attr_in2_raw.dev_attr.attr,
+ &iio_dev_attr_in3_raw.dev_attr.attr,
+ &iio_dev_attr_name.dev_attr.attr,
+ &iio_dev_attr_in_scale.dev_attr.attr,
+ NULL
+};
+
+static struct attribute_group ad7991_5_9_3_4_dev_attr_group = {
+ .attrs = ad7991_5_9_3_4_device_attrs,
+};
+
+static struct attribute *ad7991_5_9_3_4_scan_el_attrs[] = {
+ &iio_scan_el_in0.dev_attr.attr,
+ &iio_const_attr_in0_index.dev_attr.attr,
+ &iio_scan_el_in1.dev_attr.attr,
+ &iio_const_attr_in1_index.dev_attr.attr,
+ &iio_scan_el_in2.dev_attr.attr,
+ &iio_const_attr_in2_index.dev_attr.attr,
+ &iio_scan_el_in3.dev_attr.attr,
+ &iio_const_attr_in3_index.dev_attr.attr,
+ &iio_dev_attr_in_precision.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ad7991_5_9_3_4_scan_el_group = {
+ .name = "scan_elements",
+ .attrs = ad7991_5_9_3_4_scan_el_attrs,
+};
+
+static struct attribute *ad7992_device_attrs[] = {
+ &iio_dev_attr_in0_raw.dev_attr.attr,
+ &iio_dev_attr_in1_raw.dev_attr.attr,
+ &iio_dev_attr_name.dev_attr.attr,
+ &iio_dev_attr_in_scale.dev_attr.attr,
+ NULL
+};
+
+static struct attribute_group ad7992_dev_attr_group = {
+ .attrs = ad7992_device_attrs,
+};
+
+static struct attribute *ad7992_scan_el_attrs[] = {
+ &iio_scan_el_in0.dev_attr.attr,
+ &iio_const_attr_in0_index.dev_attr.attr,
+ &iio_scan_el_in1.dev_attr.attr,
+ &iio_const_attr_in1_index.dev_attr.attr,
+ &iio_dev_attr_in_precision.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ad7992_scan_el_group = {
+ .name = "scan_elements",
+ .attrs = ad7992_scan_el_attrs,
+};
+
+static struct attribute *ad7997_8_device_attrs[] = {
+ &iio_dev_attr_in0_raw.dev_attr.attr,
+ &iio_dev_attr_in1_raw.dev_attr.attr,
+ &iio_dev_attr_in2_raw.dev_attr.attr,
+ &iio_dev_attr_in3_raw.dev_attr.attr,
+ &iio_dev_attr_in4_raw.dev_attr.attr,
+ &iio_dev_attr_in5_raw.dev_attr.attr,
+ &iio_dev_attr_in6_raw.dev_attr.attr,
+ &iio_dev_attr_in7_raw.dev_attr.attr,
+ &iio_dev_attr_name.dev_attr.attr,
+ &iio_dev_attr_in_scale.dev_attr.attr,
+ NULL
+};
+
+static struct attribute_group ad7997_8_dev_attr_group = {
+ .attrs = ad7997_8_device_attrs,
+};
+
+static struct attribute *ad7997_8_scan_el_attrs[] = {
+ &iio_scan_el_in0.dev_attr.attr,
+ &iio_const_attr_in0_index.dev_attr.attr,
+ &iio_scan_el_in1.dev_attr.attr,
+ &iio_const_attr_in1_index.dev_attr.attr,
+ &iio_scan_el_in2.dev_attr.attr,
+ &iio_const_attr_in2_index.dev_attr.attr,
+ &iio_scan_el_in3.dev_attr.attr,
+ &iio_const_attr_in3_index.dev_attr.attr,
+ &iio_scan_el_in4.dev_attr.attr,
+ &iio_const_attr_in4_index.dev_attr.attr,
+ &iio_scan_el_in5.dev_attr.attr,
+ &iio_const_attr_in5_index.dev_attr.attr,
+ &iio_scan_el_in6.dev_attr.attr,
+ &iio_const_attr_in6_index.dev_attr.attr,
+ &iio_scan_el_in7.dev_attr.attr,
+ &iio_const_attr_in7_index.dev_attr.attr,
+ &iio_dev_attr_in_precision.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ad7997_8_scan_el_group = {
+ .name = "scan_elements",
+ .attrs = ad7997_8_scan_el_attrs,
+};
+
+IIO_EVENT_ATTR_SH(in0_thresh_low_value,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD7998_DATALOW_CH1_REG);
+
+IIO_EVENT_ATTR_SH(in0_thresh_high_value,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD7998_DATAHIGH_CH1_REG);
+
+IIO_EVENT_ATTR_SH(in0_thresh_both_hyst_raw,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD7998_HYST_CH1_REG);
+
+IIO_EVENT_ATTR_SH(in1_thresh_low_value,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD7998_DATALOW_CH2_REG);
+
+IIO_EVENT_ATTR_SH(in1_thresh_high_value,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD7998_DATAHIGH_CH2_REG);
+
+IIO_EVENT_ATTR_SH(in1_thresh_both_hyst_raw,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD7998_HYST_CH2_REG);
+
+IIO_EVENT_ATTR_SH(in2_thresh_low_value,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD7998_DATALOW_CH3_REG);
+
+IIO_EVENT_ATTR_SH(in2_thresh_high_value,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD7998_DATAHIGH_CH3_REG);
+
+IIO_EVENT_ATTR_SH(in2_thresh_both_hyst_raw,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD7998_HYST_CH3_REG);
+
+IIO_EVENT_ATTR_SH(in3_thresh_low_value,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD7998_DATALOW_CH4_REG);
+
+IIO_EVENT_ATTR_SH(in3_thresh_high_value,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD7998_DATAHIGH_CH4_REG);
+
+IIO_EVENT_ATTR_SH(in3_thresh_both_hyst_raw,
+ iio_event_ad799x,
+ ad799x_read_channel_config,
+ ad799x_write_channel_config,
+ AD7998_HYST_CH4_REG);
+
+static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
+ ad799x_read_frequency,
+ ad799x_write_frequency);
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
+
+static struct attribute *ad7993_4_7_8_event_attributes[] = {
+ &iio_event_attr_in0_thresh_low_value.dev_attr.attr,
+ &iio_event_attr_in0_thresh_high_value.dev_attr.attr,
+ &iio_event_attr_in0_thresh_both_hyst_raw.dev_attr.attr,
+ &iio_event_attr_in1_thresh_low_value.dev_attr.attr,
+ &iio_event_attr_in1_thresh_high_value.dev_attr.attr,
+ &iio_event_attr_in1_thresh_both_hyst_raw.dev_attr.attr,
+ &iio_event_attr_in2_thresh_low_value.dev_attr.attr,
+ &iio_event_attr_in2_thresh_high_value.dev_attr.attr,
+ &iio_event_attr_in2_thresh_both_hyst_raw.dev_attr.attr,
+ &iio_event_attr_in3_thresh_low_value.dev_attr.attr,
+ &iio_event_attr_in3_thresh_high_value.dev_attr.attr,
+ &iio_event_attr_in3_thresh_both_hyst_raw.dev_attr.attr,
+ &iio_dev_attr_sampling_frequency.dev_attr.attr,
+ &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ad7993_4_7_8_event_attrs_group = {
+ .attrs = ad7993_4_7_8_event_attributes,
+};
+
+static struct attribute *ad7992_event_attributes[] = {
+ &iio_event_attr_in0_thresh_low_value.dev_attr.attr,
+ &iio_event_attr_in0_thresh_high_value.dev_attr.attr,
+ &iio_event_attr_in0_thresh_both_hyst_raw.dev_attr.attr,
+ &iio_event_attr_in1_thresh_low_value.dev_attr.attr,
+ &iio_event_attr_in1_thresh_high_value.dev_attr.attr,
+ &iio_event_attr_in1_thresh_both_hyst_raw.dev_attr.attr,
+ &iio_dev_attr_sampling_frequency.dev_attr.attr,
+ &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ad7992_event_attrs_group = {
+ .attrs = ad7992_event_attributes,
+};
+
+static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
+ [ad7991] = {
+ .num_inputs = 4,
+ .bits = 12,
+ .int_vref_mv = 4096,
+ .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
+ .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
+ .ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
+ },
+ [ad7995] = {
+ .num_inputs = 4,
+ .bits = 10,
+ .int_vref_mv = 1024,
+ .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
+ .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
+ .ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
+ },
+ [ad7999] = {
+ .num_inputs = 4,
+ .bits = 10,
+ .int_vref_mv = 1024,
+ .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
+ .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
+ .ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
+ },
+ [ad7992] = {
+ .num_inputs = 2,
+ .bits = 12,
+ .int_vref_mv = 4096,
+ .monitor_mode = true,
+ .default_config = AD7998_ALERT_EN,
+ .dev_attrs = &ad7992_dev_attr_group,
+ .scan_attrs = &ad7992_scan_el_group,
+ .event_attrs = &ad7992_event_attrs_group,
+ .ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
+ },
+ [ad7993] = {
+ .num_inputs = 4,
+ .bits = 10,
+ .int_vref_mv = 1024,
+ .monitor_mode = true,
+ .default_config = AD7998_ALERT_EN,
+ .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
+ .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
+ .event_attrs = &ad7993_4_7_8_event_attrs_group,
+ .ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
+ },
+ [ad7994] = {
+ .num_inputs = 4,
+ .bits = 12,
+ .int_vref_mv = 4096,
+ .monitor_mode = true,
+ .default_config = AD7998_ALERT_EN,
+ .dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
+ .scan_attrs = &ad7991_5_9_3_4_scan_el_group,
+ .event_attrs = &ad7993_4_7_8_event_attrs_group,
+ .ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
+ },
+ [ad7997] = {
+ .num_inputs = 8,
+ .bits = 10,
+ .int_vref_mv = 1024,
+ .monitor_mode = true,
+ .default_config = AD7998_ALERT_EN,
+ .dev_attrs = &ad7997_8_dev_attr_group,
+ .scan_attrs = &ad7997_8_scan_el_group,
+ .event_attrs = &ad7993_4_7_8_event_attrs_group,
+ .ad799x_set_scan_mode = ad7997_8_set_scan_mode,
+ },
+ [ad7998] = {
+ .num_inputs = 8,
+ .bits = 12,
+ .int_vref_mv = 4096,
+ .monitor_mode = true,
+ .default_config = AD7998_ALERT_EN,
+ .dev_attrs = &ad7997_8_dev_attr_group,
+ .scan_attrs = &ad7997_8_scan_el_group,
+ .event_attrs = &ad7993_4_7_8_event_attrs_group,
+ .ad799x_set_scan_mode = ad7997_8_set_scan_mode,
+ },
+};
+
+static int __devinit ad799x_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret, regdone = 0;
+ struct ad799x_platform_data *pdata = client->dev.platform_data;
+ struct ad799x_state *st = kzalloc(sizeof(*st), GFP_KERNEL);
+ if (st == NULL) {
+ ret = -ENOMEM;
+ goto error_ret;
+ }
+
+ /* this is only used for device removal purposes */
+ i2c_set_clientdata(client, st);
+
+ atomic_set(&st->protect_ring, 0);
+ st->id = id->driver_data;
+ st->chip_info = &ad799x_chip_info_tbl[st->id];
+ st->config = st->chip_info->default_config;
+
+ /* TODO: Add pdata options for filtering and bit delay */
+
+ if (pdata)
+ st->int_vref_mv = pdata->vref_mv;
+ else
+ st->int_vref_mv = st->chip_info->int_vref_mv;
+
+ st->reg = regulator_get(&client->dev, "vcc");
+ if (!IS_ERR(st->reg)) {
+ ret = regulator_enable(st->reg);
+ if (ret)
+ goto error_put_reg;
+ }
+ st->client = client;
+
+ st->indio_dev = iio_allocate_device();
+ if (st->indio_dev == NULL) {
+ ret = -ENOMEM;
+ goto error_disable_reg;
+ }
+
+ /* Estabilish that the iio_dev is a child of the i2c device */
+ st->indio_dev->dev.parent = &client->dev;
+ st->indio_dev->attrs = st->chip_info->dev_attrs;
+ st->indio_dev->event_attrs = st->chip_info->event_attrs;
+
+ st->indio_dev->dev_data = (void *)(st);
+ st->indio_dev->driver_module = THIS_MODULE;
+ st->indio_dev->modes = INDIO_DIRECT_MODE;
+ st->indio_dev->num_interrupt_lines = 1;
+
+ ret = ad799x_set_scan_mode(st, 0);
+ if (ret)
+ goto error_free_device;
+
+ ret = ad799x_register_ring_funcs_and_init(st->indio_dev);
+ if (ret)
+ goto error_free_device;
+
+ ret = iio_device_register(st->indio_dev);
+ if (ret)
+ goto error_cleanup_ring;
+ regdone = 1;
+
+ ret = iio_ring_buffer_register(st->indio_dev->ring, 0);
+ if (ret)
+ goto error_cleanup_ring;
+
+ if (client->irq > 0 && st->chip_info->monitor_mode) {
+ INIT_WORK(&st->work_thresh, ad799x_interrupt_bh);
+
+ ret = iio_register_interrupt_line(client->irq,
+ st->indio_dev,
+ 0,
+ IRQF_TRIGGER_FALLING,
+ client->name);
+ if (ret)
+ goto error_cleanup_ring;
+
+ /*
+ * The event handler list element refer to iio_event_ad799x.
+ * All event attributes bind to the same event handler.
+ * So, only register event handler once.
+ */
+ iio_add_event_to_list(&iio_event_ad799x,
+ &st->indio_dev->interrupts[0]->ev_list);
+ }
+
+ return 0;
+error_cleanup_ring:
+ ad799x_ring_cleanup(st->indio_dev);
+error_free_device:
+ if (!regdone)
+ iio_free_device(st->indio_dev);
+ else
+ iio_device_unregister(st->indio_dev);
+error_disable_reg:
+ if (!IS_ERR(st->reg))
+ regulator_disable(st->reg);
+error_put_reg:
+ if (!IS_ERR(st->reg))
+ regulator_put(st->reg);
+ kfree(st);
+error_ret:
+ return ret;
+}
+
+static __devexit int ad799x_remove(struct i2c_client *client)
+{
+ struct ad799x_state *st = i2c_get_clientdata(client);
+ struct iio_dev *indio_dev = st->indio_dev;
+
+ if (client->irq > 0 && st->chip_info->monitor_mode)
+ iio_unregister_interrupt_line(indio_dev, 0);
+
+ iio_ring_buffer_unregister(indio_dev->ring);
+ ad799x_ring_cleanup(indio_dev);
+ iio_device_unregister(indio_dev);
+ if (!IS_ERR(st->reg)) {
+ regulator_disable(st->reg);
+ regulator_put(st->reg);
+ }
+ kfree(st);
+
+ return 0;
+}
+
+static const struct i2c_device_id ad799x_id[] = {
+ { "ad7991", ad7991 },
+ { "ad7995", ad7995 },
+ { "ad7999", ad7999 },
+ { "ad7992", ad7992 },
+ { "ad7993", ad7993 },
+ { "ad7994", ad7994 },
+ { "ad7997", ad7997 },
+ { "ad7998", ad7998 },
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, ad799x_id);
+
+static struct i2c_driver ad799x_driver = {
+ .driver = {
+ .name = "ad799x",
+ },
+ .probe = ad799x_probe,
+ .remove = __devexit_p(ad799x_remove),
+ .id_table = ad799x_id,
+};
+
+static __init int ad799x_init(void)
+{
+ return i2c_add_driver(&ad799x_driver);
+}
+
+static __exit void ad799x_exit(void)
+{
+ i2c_del_driver(&ad799x_driver);
+}
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("Analog Devices AD799x ADC");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("i2c:ad799x");
+
+module_init(ad799x_init);
+module_exit(ad799x_exit);
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff