Added: trunk/drivers/staging/iio/adc/adt7408.c (0 => 8497)
--- trunk/drivers/staging/iio/adc/adt7408.c (rev 0)
+++ trunk/drivers/staging/iio/adc/adt7408.c 2010-03-18 08:59:41 UTC (rev 8497)
@@ -0,0 +1,1016 @@
+/*
+ * ADT7408 digital temperature sensor driver supporting ADT7408
+ *
+ * Copyright 2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/gpio.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/rtc.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+
+/*
+ * ADT7408 registers definition
+ */
+
+#define ADT7408_CAPABILITY 0
+#define ADT7408_CONFIG 1
+#define ADT7408_T_ALARM_HIGH 2
+#define ADT7408_T_ALARM_LOW 3
+#define ADT7408_T_CRIT 4
+#define ADT7408_TEMPERATURE 5
+#define ADT7408_MANUFACTURER_ID 6
+#define ADT7408_DEVICE_ID 7
+
+/*
+ * ADT7408 capability
+ */
+#define ADT7408_CAP_ALARM_CRIT_TRIPS 0x1
+#define ADT7408_CAP_HIGH_PRECISION 0x2
+#define ADT7408_CAP_WIDER_RANGE 0x4
+#define ADT7408_CAP_T_RESOLUTION_MASK 0x18
+#define ADT7408_CAP_T_RESOLUTION_HIGH 0x18
+#define ADT7408_CAP_T_RESOLUTION_LOW 0x8
+
+/*
+ * ADT7408 config
+ */
+#define ADT7408_EVENT_MODE 0x1
+#define ADT7408_EVENT_POLARITY 0x2
+#define ADT7408_EVENT_CRIT_ONLY 0x4
+#define ADT7408_EVENT_ENABLE 0x8
+#define ADT7408_EVENT_STATUS 0x10
+#define ADT7408_EVENT_CLEAR 0x20
+#define ADT7408_EVENT_ALARM_LOCK 0x40
+#define ADT7408_EVENT_CRIT_LOCK 0x80
+#define ADT7408_PD 0x100
+#define ADT7408_HISTERESIS_MASK 0x600
+#define ADT7408_HISTERESIS_1_5 0x200
+#define ADT7408_HISTERESIS_3 0x400
+#define ADT7408_HISTERESIS_6 0x600
+
+/*
+ * ADT7408 masks
+ */
+#define ADT7408_BOUND_VALUE_SIGN 0x400
+#define ADT7408_BOUND_VALUE_OFFSET 2
+#define ADT7408_BOUND_VALUE_MASK 0x3
+#define ADT7408_BOUND_VALUE_FLOAT_OFFSET 2
+#define ADT7408_BOUND_VALUE_FLOAT_MASK 0x3
+#define ADT7408_T_VALUE_SIGN 0x1000
+#define ADT7408_T_VALUE_FLOAT_OFFSET 4
+#define ADT7408_T_VALUE_FLOAT_MASK 0xF
+
+/*
+ * ADT7408 event source
+ */
+#define ADT7408_T_BELLOW_ALARM 0x2000
+#define ADT7408_T_ABOVE_ALARM 0x4000
+#define ADT7408_T_ABOVE_CRIT 0x8000
+
+
+/*
+ * struct adt7408_chip_info - chip specifc information
+ */
+
+struct adt7408_chip_info {
+ const char *name;
+ struct i2c_client *client;
+ struct iio_dev *indio_dev;
+ struct iio_work_cont work_cont_thresh;
+ s64 last_timestamp;
+ u16 config;
+};
+
+/*
+ * adt7408 register access by I2C
+ */
+
+static int adt7408_i2c_read(struct adt7408_chip_info *chip, u8 reg, u16 *data)
+{
+ struct i2c_client *client = chip->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 = ""
+
+ return 0;
+}
+
+static int adt7408_i2c_write(struct adt7408_chip_info *chip, u8 reg, u16 data)
+{
+ struct i2c_client *client = chip->client;
+ int ret = 0;
+
+ ret = i2c_smbus_write_word_data(client, reg, cpu_to_be16(data));
+ if (ret < 0)
+ dev_err(&client->dev, "I2C write error\n");
+
+ return ret;
+}
+
+static int adt7408_is_event_locked(struct adt7408_chip_info *chip)
+{
+ return chip->config & (ADT7408_EVENT_ALARM_LOCK | ADT7408_EVENT_ALARM_LOCK);
+}
+
+static ssize_t adt7408_show_mode(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+
+ if (chip->config & ADT7408_PD)
+ return sprintf(buf, "power-save\n");
+ else
+ return sprintf(buf, "full\n");
+}
+
+static ssize_t adt7408_store_mode(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ u16 config;
+ int ret;
+
+ if (adt7408_is_event_locked(chip)) {
+ dev_err(dev, "Warning: Events are locked.\n");
+ return -EIO;
+ }
+
+ ret = adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ config = chip->config & (~ADT7408_PD);
+ if (!strcmp(buf, "full"))
+ config |= ADT7408_PD;
+
+ ret = adt7408_i2c_write(chip, ADT7408_CONFIG, config);
+ if (ret)
+ return -EIO;
+
+ chip->config = config;
+
+ return ret;
+}
+
+IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
+ adt7408_show_mode,
+ adt7408_store_mode,
+ 0);
+
+static ssize_t adt7408_show_available_modes(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "full\npower-down\n");
+}
+
+IIO_DEVICE_ATTR(available_modes, S_IRUGO, adt7408_show_available_modes, NULL, 0);
+
+static ssize_t adt7408_show_capability(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ u16 capability;
+ int ret;
+
+ ret = adt7408_i2c_read(chip, ADT7408_CAPABILITY, &capability);
+ if (ret)
+ return -EIO;
+
+ return sprintf(buf, "0x%x\n", capability);
+}
+
+IIO_DEVICE_ATTR(capability, S_IRUGO | S_IWUSR,
+ adt7408_show_capability,
+ NULL,
+ 0);
+
+static ssize_t adt7408_show_manufactory_id(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ u16 id;
+ int ret;
+
+ ret = adt7408_i2c_read(chip, ADT7408_MANUFACTURER_ID, &id);
+ if (ret)
+ return -EIO;
+
+ return sprintf(buf, "0x%x\n", id);
+}
+
+IIO_DEVICE_ATTR(manufactory_id, S_IRUGO | S_IWUSR,
+ adt7408_show_manufactory_id,
+ NULL,
+ 0);
+
+static ssize_t adt7408_show_device_id(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ u16 id;
+ int ret;
+
+ ret = adt7408_i2c_read(chip, ADT7408_MANUFACTURER_ID, &id);
+ if (ret)
+ return -EIO;
+
+ return sprintf(buf, "0x%x\n", id);
+}
+
+IIO_DEVICE_ATTR(device_id, S_IRUGO | S_IWUSR,
+ adt7408_show_device_id,
+ NULL,
+ 0);
+
+static ssize_t adt7408_show_value(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ u16 data;
+ char sign = ' ';
+ int ret;
+
+ if (chip->config & ADT7408_PD) {
+ dev_err(dev, "Can't read value in power-down mode.\n");
+ return -EIO;
+ }
+
+ ret = adt7408_i2c_read(chip, ADT7408_TEMPERATURE, &data);
+ if (ret)
+ return -EIO;
+
+ if (data & ADT7408_T_VALUE_SIGN) {
+ /* convert supplement to positive value */
+ data = "" << 1) - data;
+ sign = '-';
+ }
+
+ return sprintf(buf, "%c%d.%.4d\n", sign,
+ (data >> ADT7408_T_VALUE_FLOAT_OFFSET),
+ (data & ADT7408_T_VALUE_FLOAT_MASK) * 625);
+}
+
+IIO_DEVICE_ATTR(value, S_IRUGO, adt7408_show_value, NULL, 0);
+
+static ssize_t adt7408_show_name(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ return sprintf(buf, "%s\n", chip->name);
+}
+
+IIO_DEVICE_ATTR(name, S_IRUGO, adt7408_show_name, NULL, 0);
+
+static struct attribute *adt7408_attributes[] = {
+ &iio_dev_attr_available_modes.dev_attr.attr,
+ &iio_dev_attr_mode.dev_attr.attr,
+ &iio_dev_attr_capability.dev_attr.attr,
+ &iio_dev_attr_device_id.dev_attr.attr,
+ &iio_dev_attr_manufactory_id.dev_attr.attr,
+ &iio_dev_attr_value.dev_attr.attr,
+ &iio_dev_attr_name.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group adt7408_attribute_group = {
+ .attrs = adt7408_attributes,
+};
+
+/*
+ * temperature bound events
+ */
+
+#define IIO_EVENT_CODE_ADT7408_ABOVE_ALARM (IIO_EVENT_CODE_DEVICE_SPECIFIC + 1)
+#define IIO_EVENT_CODE_ADT7408_BELLOW_ALARM (IIO_EVENT_CODE_DEVICE_SPECIFIC + 2)
+#define IIO_EVENT_CODE_ADT7408_ABOVE_CRIT (IIO_EVENT_CODE_DEVICE_SPECIFIC + 3)
+
+static void adt7408_interrupt_bh(struct work_struct *work_s)
+{
+ struct iio_work_cont *wc
+ = container_of(work_s, struct iio_work_cont, ws_nocheck);
+ struct adt7408_chip_info *chip = wc->st;
+ u16 config;
+ u16 data;
+
+ if (adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config))
+ return;
+
+ if (!(chip->config & ADT7408_EVENT_STATUS))
+ return;
+
+ config = chip->config & ~ADT7408_EVENT_CLEAR;
+ if (data)
+ config |= ADT7408_EVENT_CLEAR;
+
+ adt7408_i2c_write(chip, ADT7408_CONFIG, config);
+
+ if (adt7408_i2c_read(chip, ADT7408_TEMPERATURE, &data))
+ goto exit;
+
+ if (data & ADT7408_T_ABOVE_ALARM)
+ iio_push_event(chip->indio_dev, 0,
+ IIO_EVENT_CODE_ADT7408_ABOVE_ALARM,
+ chip->last_timestamp);
+ if (data & ADT7408_T_BELLOW_ALARM)
+ iio_push_event(chip->indio_dev, 0,
+ IIO_EVENT_CODE_ADT7408_BELLOW_ALARM,
+ chip->last_timestamp);
+ if (data & ADT7408_T_ABOVE_ALARM)
+ iio_push_event(chip->indio_dev, 0,
+ IIO_EVENT_CODE_ADT7408_ABOVE_CRIT,
+ chip->last_timestamp);
+exit:
+ enable_irq(chip->client->irq);
+}
+
+static int adt7408_interrupt(struct iio_dev *dev_info,
+ int index,
+ s64 timestamp,
+ int no_test)
+{
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+
+ chip->last_timestamp = timestamp;
+ schedule_work(&chip->work_cont_thresh.ws);
+
+ return 0;
+}
+
+IIO_EVENT_SH(adt7408, &adt7408_interrupt);
+
+static ssize_t adt7408_show_event_mode(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ int ret;
+
+ ret = adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ if (chip->config & ADT7408_EVENT_MODE)
+ return sprintf(buf, "interrupt\n");
+ else
+ return sprintf(buf, "comparator\n");
+}
+
+static ssize_t adt7408_set_event_mode(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ u16 config;
+ int ret;
+
+ if (adt7408_is_event_locked(chip)) {
+ dev_err(dev, "Warning: Events are locked.\n");
+ return -EIO;
+ }
+
+ ret = adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ config = chip->config &= ~ADT7408_EVENT_MODE;
+ if (strcmp(buf, "comparator") != 0)
+ config |= ADT7408_EVENT_MODE;
+
+ ret = adt7408_i2c_write(chip, ADT7408_CONFIG, config);
+ if (ret)
+ return -EIO;
+
+ chip->config = config;
+
+ return ret;
+}
+
+static ssize_t adt7408_show_available_event_modes(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "comparator\ninterrupt\n");
+}
+
+static ssize_t adt7408_show_event_crit_only(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ int ret;
+
+ ret = adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ return sprintf(buf, "%d\n", !!(chip->config & ADT7408_EVENT_CRIT_ONLY));
+}
+
+static ssize_t adt7408_set_event_crit_only(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ unsigned long data = ""
+ u16 config;
+ int ret;
+
+ if (adt7408_is_event_locked(chip)) {
+ dev_err(dev, "Warning: Events are locked.\n");
+ return -EIO;
+ }
+
+ ret = strict_strtoul(buf, 10, &data);
+ if (ret)
+ return -EINVAL;
+
+ ret = adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ config = chip->config &= ~ADT7408_EVENT_CRIT_ONLY;
+ if (data)
+ config |= ADT7408_EVENT_CRIT_ONLY;
+
+ ret = adt7408_i2c_write(chip, ADT7408_CONFIG, config);
+ if (ret)
+ return -EIO;
+
+ chip->config = config;
+
+ return ret;
+}
+
+static ssize_t adt7408_show_event_enable(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ int ret;
+
+ ret = adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ return sprintf(buf, "%d\n", !!(chip->config & ADT7408_EVENT_ENABLE));
+}
+
+static ssize_t adt7408_set_event_enable(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ unsigned long data;
+ u16 config;
+ int ret;
+
+ if (adt7408_is_event_locked(chip)) {
+ dev_err(dev, "Warning: Events are locked.\n");
+ return -EIO;
+ }
+
+ ret = strict_strtoul(buf, 10, &data);
+ if (ret)
+ return -EINVAL;
+
+ ret = adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ config = chip->config & ~ADT7408_EVENT_ENABLE;
+ if (data)
+ config |= ADT7408_EVENT_ENABLE;
+
+ ret = adt7408_i2c_write(chip, ADT7408_CONFIG, config);
+ if (ret)
+ return -EIO;
+
+ chip->config = config;
+
+ return ret;
+}
+
+static ssize_t adt7408_show_alarm_lock(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ int ret;
+
+ ret = adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ return sprintf(buf, "%d\n", !!(chip->config & ADT7408_EVENT_ALARM_LOCK));
+}
+
+static ssize_t adt7408_set_alarm_lock(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ unsigned long data;
+ u16 config;
+ int ret;
+
+ ret = strict_strtoul(buf, 10, &data);
+ if (ret)
+ return -EINVAL;
+
+ ret = adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ config = chip->config & ~ADT7408_EVENT_ALARM_LOCK;
+ if (data)
+ config |= ADT7408_EVENT_ALARM_LOCK;
+
+ ret = adt7408_i2c_write(chip, ADT7408_CONFIG, config);
+ if (ret)
+ return -EIO;
+
+ chip->config = config;
+
+ return ret;
+}
+
+static ssize_t adt7408_show_crit_lock(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ int ret;
+
+ ret = adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ return sprintf(buf, "%d\n", !!(chip->config & ADT7408_EVENT_CRIT_LOCK));
+}
+
+static ssize_t adt7408_set_crit_lock(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ unsigned long data;
+ u16 config;
+ int ret;
+
+ ret = strict_strtoul(buf, 10, &data);
+ if (ret)
+ return -EINVAL;
+
+ ret = adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ config = chip->config & ~ADT7408_EVENT_CRIT_LOCK;
+ if (data)
+ config |= ADT7408_EVENT_CRIT_LOCK;
+
+ ret = adt7408_i2c_write(chip, ADT7408_CONFIG, config);
+ if (ret)
+ return -EIO;
+
+ chip->config = config;
+
+ return ret;
+}
+
+
+static inline ssize_t adt7408_show_t_bound(struct device *dev,
+ struct device_attribute *attr,
+ u8 bound_reg,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ u16 data;
+ char sign = ' ';
+ int ret;
+
+ ret = adt7408_i2c_read(chip, bound_reg, &data);
+ if (ret)
+ return -EIO;
+
+ data >>= ADT7408_BOUND_VALUE_OFFSET;
+ if (data & ADT7408_BOUND_VALUE_SIGN) {
+ /* convert supplement to positive value */
+ data = "" << 1) - data;
+ sign = '-';
+ }
+
+ return sprintf(buf, "%c%d.%.2d\n", sign,
+ data >> ADT7408_BOUND_VALUE_FLOAT_OFFSET,
+ (data & ADT7408_BOUND_VALUE_FLOAT_MASK) * 25);
+}
+
+static inline ssize_t adt7408_set_t_bound(struct device *dev,
+ struct device_attribute *attr,
+ u8 bound_reg,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ long tmp1, tmp2;
+ u16 data;
+ char *pos;
+ int ret;
+
+ pos = strchr(buf, '.');
+
+ ret = strict_strtol(buf, 10, &tmp1);
+
+ if (ret || tmp1 > 127 || tmp1 < -127)
+ return -EINVAL;
+
+ if (pos) {
+ len = strlen(pos);
+ if (len > ADT7408_BOUND_VALUE_FLOAT_OFFSET)
+ len = ADT7408_BOUND_VALUE_FLOAT_OFFSET;
+ pos[len] = 0;
+ ret = strict_strtol(pos, 10, &tmp2);
+
+ if (!ret)
+ tmp2 = (tmp2 / 25) * 25;
+ }
+
+ if (tmp1 < 0)
+ data = ""
+ else
+ data = ""
+ data = "" << ADT7408_BOUND_VALUE_FLOAT_OFFSET) | (tmp2 & ADT7408_BOUND_VALUE_MASK);
+ if (tmp1 < 0)
+ /* convert positive value to supplyment */
+ data = "" << 1) - data;
+ data <<= ADT7408_BOUND_VALUE_OFFSET;
+
+ ret = adt7408_i2c_write(chip, bound_reg, (u8)data);
+ if (ret)
+ return -EIO;
+
+ return ret;
+}
+
+static ssize_t adt7408_show_t_alarm_high(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return adt7408_show_t_bound(dev, attr,
+ ADT7408_T_ALARM_HIGH, buf);
+}
+
+static inline ssize_t adt7408_set_t_alarm_high(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ return adt7408_set_t_bound(dev, attr,
+ ADT7408_T_ALARM_HIGH, buf, len);
+}
+
+static ssize_t adt7408_show_t_alarm_low(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return adt7408_show_t_bound(dev, attr,
+ ADT7408_T_ALARM_LOW, buf);
+}
+
+static inline ssize_t adt7408_set_t_alarm_low(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ return adt7408_set_t_bound(dev, attr,
+ ADT7408_T_ALARM_LOW, buf, len);
+}
+
+static ssize_t adt7408_show_t_crit(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return adt7408_show_t_bound(dev, attr,
+ ADT7408_T_CRIT, buf);
+}
+
+static inline ssize_t adt7408_set_t_crit(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ return adt7408_set_t_bound(dev, attr,
+ ADT7408_T_CRIT, buf, len);
+}
+
+static ssize_t adt7408_show_t_hyst(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ int ret;
+
+ /* retrive ALART status */
+ ret = adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ switch (chip->config & ADT7408_HISTERESIS_MASK) {
+ case ADT7408_HISTERESIS_1_5:
+ return sprintf(buf, "1.5\n");
+ case ADT7408_HISTERESIS_3:
+ return sprintf(buf, "3\n");
+ case ADT7408_HISTERESIS_6:
+ return sprintf(buf, "6\n");
+ default:
+ return sprintf(buf, "Disabled\n");
+ }
+}
+
+static inline ssize_t adt7408_set_t_hyst(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7408_chip_info *chip = dev_info->dev_data;
+ int ret;
+ u16 config = 0;
+
+ if (strcmp(buf, "disble"))
+ config = ADT7408_HISTERESIS_MASK;
+ else if (strcmp(buf, "1.5"))
+ config = ADT7408_HISTERESIS_1_5;
+ else if (len > 1 && buf[0] == '3')
+ config = ADT7408_HISTERESIS_6;
+ else if (len > 1 && buf[0] == '6')
+ config = ADT7408_HISTERESIS_6;
+
+ if (!config)
+ return -EINVAL;
+
+ /* retrive ALART status */
+ ret = adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ config |= chip->config & ~ADT7408_HISTERESIS_MASK;
+
+ ret = adt7408_i2c_write(chip, ADT7408_CONFIG, config);
+ if (ret)
+ return -EIO;
+
+ chip->config = config;
+ return ret;
+}
+
+static ssize_t adt7408_show_available_t_hyst(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "1.5\n3\n6\ndisable\n");
+}
+
+IIO_EVENT_ATTR_SH(event_mode, iio_event_adt7408,
+ adt7408_show_event_mode, adt7408_set_event_mode, 0);
+IIO_EVENT_ATTR_SH(available_event_modes, iio_event_adt7408,
+ adt7408_show_available_event_modes, NULL, 0);
+IIO_EVENT_ATTR_SH(event_crit_only, iio_event_adt7408,
+ adt7408_show_event_crit_only, adt7408_set_event_crit_only, 0);
+IIO_EVENT_ATTR_SH(event_enable, iio_event_adt7408,
+ adt7408_show_event_enable, adt7408_set_event_enable, 0);
+IIO_EVENT_ATTR_SH(alarm_lock, iio_event_adt7408,
+ adt7408_show_alarm_lock, adt7408_set_alarm_lock, 0);
+IIO_EVENT_ATTR_SH(crit_lock, iio_event_adt7408,
+ adt7408_show_crit_lock, adt7408_set_crit_lock, 0);
+IIO_EVENT_ATTR_SH(t_alarm_high, iio_event_adt7408,
+ adt7408_show_t_alarm_high, adt7408_set_t_alarm_high, 0);
+IIO_EVENT_ATTR_SH(t_alarm_low, iio_event_adt7408,
+ adt7408_show_t_alarm_low, adt7408_set_t_alarm_low, 0);
+IIO_EVENT_ATTR_SH(t_crit, iio_event_adt7408,
+ adt7408_show_t_crit, adt7408_set_t_crit, 0);
+IIO_EVENT_ATTR_SH(t_hyst, iio_event_adt7408,
+ adt7408_show_t_hyst, adt7408_set_t_hyst, 0);
+IIO_EVENT_ATTR_SH(available_t_hyst, iio_event_adt7408,
+ adt7408_show_available_t_hyst, NULL, 0);
+
+static struct attribute *adt7408_event_attributes[] = {
+ &iio_event_attr_event_mode.dev_attr.attr,
+ &iio_event_attr_available_event_modes.dev_attr.attr,
+ &iio_event_attr_event_crit_only.dev_attr.attr,
+ &iio_event_attr_event_enable.dev_attr.attr,
+ &iio_event_attr_alarm_lock.dev_attr.attr,
+ &iio_event_attr_crit_lock.dev_attr.attr,
+ &iio_event_attr_t_alarm_high.dev_attr.attr,
+ &iio_event_attr_t_alarm_low.dev_attr.attr,
+ &iio_event_attr_t_crit.dev_attr.attr,
+ &iio_event_attr_t_hyst.dev_attr.attr,
+ &iio_event_attr_available_t_hyst.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group adt7408_event_attribute_group = {
+ .attrs = adt7408_event_attributes,
+};
+
+/*
+ * device probe and remove
+ */
+
+static int __devinit adt7408_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct adt7408_chip_info *chip;
+ int ret = 0;
+ unsigned int irq_flags = (unsigned int)client->dev.platform_data;
+
+ if (!(irq_flags == IRQF_TRIGGER_HIGH ||
+ irq_flags == IRQF_TRIGGER_LOW)) {
+ dev_err(&client->dev, "Invalid ALART polarity defined.\n");
+ return -EINVAL;
+ }
+
+ chip = kzalloc(sizeof(struct adt7408_chip_info), GFP_KERNEL);
+
+ if (chip == NULL)
+ return -ENOMEM;
+
+ /* this is only used for device removal purposes */
+ i2c_set_clientdata(client, chip);
+
+ chip->client = client;
+ chip->name = id->name;
+
+ chip->indio_dev = iio_allocate_device();
+ if (chip->indio_dev == NULL) {
+ ret = -ENOMEM;
+ goto error_free_chip;
+ }
+
+ chip->indio_dev->dev.parent = &client->dev;
+ chip->indio_dev->attrs = &adt7408_attribute_group;
+ chip->indio_dev->event_attrs = &adt7408_event_attribute_group;
+ chip->indio_dev->dev_data = (void *)chip;
+ chip->indio_dev->driver_module = THIS_MODULE;
+ chip->indio_dev->num_interrupt_lines = 1;
+ chip->indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = iio_device_register(chip->indio_dev);
+ if (ret)
+ goto error_free_dev;
+
+ if (client->irq && gpio_is_valid(irq_to_gpio(client->irq)) > 0) {
+ iio_init_work_cont(&chip->work_cont_thresh,
+ adt7408_interrupt_bh,
+ adt7408_interrupt_bh,
+ 0,
+ 0,
+ chip);
+
+ ret = iio_register_interrupt_line(client->irq,
+ chip->indio_dev,
+ 0,
+ irq_flags,
+ chip->name);
+ if (ret)
+ goto error_unreg_dev;
+
+ /*
+ * The event handler list element refer to iio_event_adt7408.
+ * All event attributes bind to the same event handler.
+ * So, only register event handler once.
+ */
+ iio_add_event_to_list(&iio_event_adt7408,
+ &chip->indio_dev->interrupts[0]->ev_list);
+
+ ret = adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config);
+ if (ret) {
+ ret = -EIO;
+ goto error_unreg_irq;
+ }
+
+ if (irq_flags == IRQF_TRIGGER_HIGH)
+ chip->config |= ADT7408_EVENT_POLARITY;
+ else
+ chip->config &= ~ADT7408_EVENT_POLARITY;
+
+ ret = adt7408_i2c_write(chip, ADT7408_CONFIG, chip->config);
+ if (ret) {
+ ret = -EIO;
+ goto error_unreg_irq;
+ }
+ }
+
+ dev_info(&client->dev, "%s temperature sensor registered.\n",
+ id->name);
+
+ return 0;
+
+error_unreg_irq:
+ iio_unregister_interrupt_line(chip->indio_dev, 0);
+error_unreg_dev:
+ iio_device_unregister(chip->indio_dev);
+error_free_dev:
+ iio_free_device(chip->indio_dev);
+error_free_chip:
+ kfree(chip);
+
+ return ret;
+}
+
+static int __devexit adt7408_remove(struct i2c_client *client)
+{
+ struct adt7408_chip_info *chip = i2c_get_clientdata(client);
+ struct iio_dev *indio_dev = chip->indio_dev;
+
+ if (client->irq && gpio_is_valid(irq_to_gpio(client->irq)) > 0)
+ iio_unregister_interrupt_line(indio_dev, 0);
+ iio_device_unregister(indio_dev);
+ kfree(chip);
+
+ return 0;
+}
+
+static const struct i2c_device_id adt7408_id[] = {
+ { "adt7408", 0 },
+};
+
+MODULE_DEVICE_TABLE(i2c, adt7408_id);
+
+static struct i2c_driver adt7408_driver = {
+ .driver = {
+ .name = "adt7408",
+ },
+ .probe = adt7408_probe,
+ .remove = __devexit_p(adt7408_remove),
+ .id_table = adt7408_id,
+};
+
+static __init int adt7408_init(void)
+{
+ return i2c_add_driver(&adt7408_driver);
+}
+
+static __exit void adt7408_exit(void)
+{
+ i2c_del_driver(&adt7408_driver);
+}
+
+MODULE_AUTHOR("Sonic Zhang <[email protected]>");
+MODULE_DESCRIPTION("Analog Devices ADT7408 digital"
+ " temperature sensor driver");
+MODULE_LICENSE("GPL v2");
+
+module_init(adt7408_init);
+module_exit(adt7408_exit);
