--- /dev/null
+/*
+ * ADT7310 digital temperature sensor driver supporting ADT7310
+ *
+ * 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/slab.h>
+#include <linux/sysfs.h>
+#include <linux/list.h>
+#include <linux/spi/spi.h>
+#include <linux/rtc.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+
+/*
+ * ADT7310 registers definition
+ */
+
+#define ADT7310_STATUS 0
+#define ADT7310_CONFIG 1
+#define ADT7310_TEMPERATURE 2
+#define ADT7310_ID 3
+#define ADT7310_T_CRIT 4
+#define ADT7310_T_HYST 5
+#define ADT7310_T_ALARM_HIGH 6
+#define ADT7310_T_ALARM_LOW 7
+
+/*
+ * ADT7310 status
+ */
+#define ADT7310_STAT_T_LOW 0x10
+#define ADT7310_STAT_T_HIGH 0x20
+#define ADT7310_STAT_T_CRIT 0x40
+#define ADT7310_STAT_NOT_RDY 0x80
+
+/*
+ * ADT7310 config
+ */
+#define ADT7310_FAULT_QUEUE_MASK 0x3
+#define ADT7310_CT_POLARITY 0x4
+#define ADT7310_INT_POLARITY 0x8
+#define ADT7310_EVENT_MODE 0x10
+#define ADT7310_MODE_MASK 0x60
+#define ADT7310_ONESHOT 0x20
+#define ADT7310_SPS 0x40
+#define ADT7310_PD 0x60
+#define ADT7310_RESOLUTION 0x80
+
+/*
+ * ADT7310 masks
+ */
+#define ADT7310_T16_VALUE_SIGN 0x8000
+#define ADT7310_T16_VALUE_FLOAT_OFFSET 7
+#define ADT7310_T16_VALUE_FLOAT_MASK 0x7F
+#define ADT7310_T13_VALUE_SIGN 0x1000
+#define ADT7310_T13_VALUE_OFFSET 3
+#define ADT7310_T13_VALUE_FLOAT_OFFSET 4
+#define ADT7310_T13_VALUE_FLOAT_MASK 0xF
+#define ADT7310_T_HYST_MASK 0xF
+#define ADT7310_DEVICE_ID_MASK 0x7
+#define ADT7310_MANUFACTORY_ID_MASK 0xF8
+#define ADT7310_MANUFACTORY_ID_OFFSET 3
+
+
+#define ADT7310_CMD_REG_MASK 0x28
+#define ADT7310_CMD_REG_OFFSET 3
+#define ADT7310_CMD_READ 0x40
+#define ADT7310_CMD_CON_READ 0x4
+
+#define ADT7310_IRQS 2
+
+/*
+ * struct adt7310_chip_info - chip specifc information
+ */
+
+struct adt7310_chip_info {
+ const char *name;
+ struct spi_device *spi_dev;
+ struct iio_dev *indio_dev;
+ struct work_struct thresh_work;
+ s64 last_timestamp;
+ u8 config;
+};
+
+/*
+ * adt7310 register access by SPI
+ */
+
+static int adt7310_spi_read_word(struct adt7310_chip_info *chip, u8 reg, u16 *data)
+{
+ struct spi_device *spi_dev = chip->spi_dev;
+ u8 command = (reg << ADT7310_CMD_REG_OFFSET) & ADT7310_CMD_REG_MASK;
+ int ret = 0;
+
+ command |= ADT7310_CMD_READ;
+ ret = spi_write(spi_dev, &command, sizeof(command));
+ if (ret < 0) {
+ dev_err(&spi_dev->dev, "SPI write command error\n");
+ return ret;
+ }
+
+ ret = spi_read(spi_dev, (u8 *)data, sizeof(*data));
+ if (ret < 0) {
+ dev_err(&spi_dev->dev, "SPI read word error\n");
+ return ret;
+ }
+
+ *data = be16_to_cpu(*data);
+
+ return 0;
+}
+
+static int adt7310_spi_write_word(struct adt7310_chip_info *chip, u8 reg, u16 data)
+{
+ struct spi_device *spi_dev = chip->spi_dev;
+ u8 buf[3];
+ int ret = 0;
+
+ buf[0] = (reg << ADT7310_CMD_REG_OFFSET) & ADT7310_CMD_REG_MASK;
+ buf[1] = (u8)(data >> 8);
+ buf[2] = (u8)(data & 0xFF);
+
+ ret = spi_write(spi_dev, buf, 3);
+ if (ret < 0) {
+ dev_err(&spi_dev->dev, "SPI write word error\n");
+ return ret;
+ }
+
+ return ret;
+}
+
+static int adt7310_spi_read_byte(struct adt7310_chip_info *chip, u8 reg, u8 *data)
+{
+ struct spi_device *spi_dev = chip->spi_dev;
+ u8 command = (reg << ADT7310_CMD_REG_OFFSET) & ADT7310_CMD_REG_MASK;
+ int ret = 0;
+
+ command |= ADT7310_CMD_READ;
+ ret = spi_write(spi_dev, &command, sizeof(command));
+ if (ret < 0) {
+ dev_err(&spi_dev->dev, "SPI write command error\n");
+ return ret;
+ }
+
+ ret = spi_read(spi_dev, data, sizeof(*data));
+ if (ret < 0) {
+ dev_err(&spi_dev->dev, "SPI read byte error\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int adt7310_spi_write_byte(struct adt7310_chip_info *chip, u8 reg, u8 data)
+{
+ struct spi_device *spi_dev = chip->spi_dev;
+ u8 buf[2];
+ int ret = 0;
+
+ buf[0] = (reg << ADT7310_CMD_REG_OFFSET) & ADT7310_CMD_REG_MASK;
+ buf[1] = data;
+
+ ret = spi_write(spi_dev, buf, 2);
+ if (ret < 0) {
+ dev_err(&spi_dev->dev, "SPI write byte error\n");
+ return ret;
+ }
+
+ return ret;
+}
+
+static ssize_t adt7310_show_mode(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7310_chip_info *chip = dev_info->dev_data;
+ u8 config;
+
+ config = chip->config & ADT7310_MODE_MASK;
+
+ switch (config) {
+ case ADT7310_PD:
+ return sprintf(buf, "power-down\n");
+ case ADT7310_ONESHOT:
+ return sprintf(buf, "one-shot\n");
+ case ADT7310_SPS:
+ return sprintf(buf, "sps\n");
+ default:
+ return sprintf(buf, "full\n");
+ }
+}
+
+static ssize_t adt7310_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 adt7310_chip_info *chip = dev_info->dev_data;
+ u16 config;
+ int ret;
+
+ ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ config = chip->config & (~ADT7310_MODE_MASK);
+ if (strcmp(buf, "power-down"))
+ config |= ADT7310_PD;
+ else if (strcmp(buf, "one-shot"))
+ config |= ADT7310_ONESHOT;
+ else if (strcmp(buf, "sps"))
+ config |= ADT7310_SPS;
+
+ ret = adt7310_spi_write_byte(chip, ADT7310_CONFIG, config);
+ if (ret)
+ return -EIO;
+
+ chip->config = config;
+
+ return len;
+}
+
+static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
+ adt7310_show_mode,
+ adt7310_store_mode,
+ 0);
+
+static ssize_t adt7310_show_available_modes(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "full\none-shot\nsps\npower-down\n");
+}
+
+static IIO_DEVICE_ATTR(available_modes, S_IRUGO, adt7310_show_available_modes, NULL, 0);
+
+static ssize_t adt7310_show_resolution(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7310_chip_info *chip = dev_info->dev_data;
+ int ret;
+ int bits;
+
+ ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ if (chip->config & ADT7310_RESOLUTION)
+ bits = 16;
+ else
+ bits = 13;
+
+ return sprintf(buf, "%d bits\n", bits);
+}
+
+static ssize_t adt7310_store_resolution(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7310_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 = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ config = chip->config & (~ADT7310_RESOLUTION);
+ if (data)
+ config |= ADT7310_RESOLUTION;
+
+ ret = adt7310_spi_write_byte(chip, ADT7310_CONFIG, config);
+ if (ret)
+ return -EIO;
+
+ chip->config = config;
+
+ return len;
+}
+
+static IIO_DEVICE_ATTR(resolution, S_IRUGO | S_IWUSR,
+ adt7310_show_resolution,
+ adt7310_store_resolution,
+ 0);
+
+static ssize_t adt7310_show_id(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7310_chip_info *chip = dev_info->dev_data;
+ u8 id;
+ int ret;
+
+ ret = adt7310_spi_read_byte(chip, ADT7310_ID, &id);
+ if (ret)
+ return -EIO;
+
+ return sprintf(buf, "device id: 0x%x\nmanufactory id: 0x%x\n",
+ id & ADT7310_DEVICE_ID_MASK,
+ (id & ADT7310_MANUFACTORY_ID_MASK) >> ADT7310_MANUFACTORY_ID_OFFSET);
+}
+
+static IIO_DEVICE_ATTR(id, S_IRUGO | S_IWUSR,
+ adt7310_show_id,
+ NULL,
+ 0);
+
+static ssize_t adt7310_convert_temperature(struct adt7310_chip_info *chip,
+ u16 data, char *buf)
+{
+ char sign = ' ';
+
+ if (chip->config & ADT7310_RESOLUTION) {
+ if (data & ADT7310_T16_VALUE_SIGN) {
+ /* convert supplement to positive value */
+ data = (u16)((ADT7310_T16_VALUE_SIGN << 1) - (u32)data);
+ sign = '-';
+ }
+ return sprintf(buf, "%c%d.%.7d\n", sign,
+ (data >> ADT7310_T16_VALUE_FLOAT_OFFSET),
+ (data & ADT7310_T16_VALUE_FLOAT_MASK) * 78125);
+ } else {
+ if (data & ADT7310_T13_VALUE_SIGN) {
+ /* convert supplement to positive value */
+ data >>= ADT7310_T13_VALUE_OFFSET;
+ data = (ADT7310_T13_VALUE_SIGN << 1) - data;
+ sign = '-';
+ }
+ return sprintf(buf, "%c%d.%.4d\n", sign,
+ (data >> ADT7310_T13_VALUE_FLOAT_OFFSET),
+ (data & ADT7310_T13_VALUE_FLOAT_MASK) * 625);
+ }
+}
+
+static ssize_t adt7310_show_value(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7310_chip_info *chip = dev_info->dev_data;
+ u8 status;
+ u16 data;
+ int ret, i = 0;
+
+ do {
+ ret = adt7310_spi_read_byte(chip, ADT7310_STATUS, &status);
+ if (ret)
+ return -EIO;
+ i++;
+ if (i == 10000)
+ return -EIO;
+ } while (status & ADT7310_STAT_NOT_RDY);
+
+ ret = adt7310_spi_read_word(chip, ADT7310_TEMPERATURE, &data);
+ if (ret)
+ return -EIO;
+
+ return adt7310_convert_temperature(chip, data, buf);
+}
+
+static IIO_DEVICE_ATTR(value, S_IRUGO, adt7310_show_value, NULL, 0);
+
+static ssize_t adt7310_show_name(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7310_chip_info *chip = dev_info->dev_data;
+ return sprintf(buf, "%s\n", chip->name);
+}
+
+static IIO_DEVICE_ATTR(name, S_IRUGO, adt7310_show_name, NULL, 0);
+
+static struct attribute *adt7310_attributes[] = {
+ &iio_dev_attr_available_modes.dev_attr.attr,
+ &iio_dev_attr_mode.dev_attr.attr,
+ &iio_dev_attr_resolution.dev_attr.attr,
+ &iio_dev_attr_id.dev_attr.attr,
+ &iio_dev_attr_value.dev_attr.attr,
+ &iio_dev_attr_name.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group adt7310_attribute_group = {
+ .attrs = adt7310_attributes,
+};
+
+/*
+ * temperature bound events
+ */
+
+#define IIO_EVENT_CODE_ADT7310_ABOVE_ALARM IIO_BUFFER_EVENT_CODE(0)
+#define IIO_EVENT_CODE_ADT7310_BELLOW_ALARM IIO_BUFFER_EVENT_CODE(1)
+#define IIO_EVENT_CODE_ADT7310_ABOVE_CRIT IIO_BUFFER_EVENT_CODE(2)
+
+static void adt7310_interrupt_bh(struct work_struct *work_s)
+{
+ struct adt7310_chip_info *chip =
+ container_of(work_s, struct adt7310_chip_info, thresh_work);
+ u8 status;
+
+ if (adt7310_spi_read_byte(chip, ADT7310_STATUS, &status))
+ return;
+
+ if (status & ADT7310_STAT_T_HIGH)
+ iio_push_event(chip->indio_dev, 0,
+ IIO_EVENT_CODE_ADT7310_ABOVE_ALARM,
+ chip->last_timestamp);
+ if (status & ADT7310_STAT_T_LOW)
+ iio_push_event(chip->indio_dev, 0,
+ IIO_EVENT_CODE_ADT7310_BELLOW_ALARM,
+ chip->last_timestamp);
+ if (status & ADT7310_STAT_T_CRIT)
+ iio_push_event(chip->indio_dev, 0,
+ IIO_EVENT_CODE_ADT7310_ABOVE_CRIT,
+ chip->last_timestamp);
+}
+
+static int adt7310_interrupt(struct iio_dev *dev_info,
+ int index,
+ s64 timestamp,
+ int no_test)
+{
+ struct adt7310_chip_info *chip = dev_info->dev_data;
+
+ chip->last_timestamp = timestamp;
+ schedule_work(&chip->thresh_work);
+
+ return 0;
+}
+
+IIO_EVENT_SH(adt7310, &adt7310_interrupt);
+IIO_EVENT_SH(adt7310_ct, &adt7310_interrupt);
+
+static ssize_t adt7310_show_event_mode(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7310_chip_info *chip = dev_info->dev_data;
+ int ret;
+
+ ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ if (chip->config & ADT7310_EVENT_MODE)
+ return sprintf(buf, "interrupt\n");
+ else
+ return sprintf(buf, "comparator\n");
+}
+
+static ssize_t adt7310_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 adt7310_chip_info *chip = dev_info->dev_data;
+ u16 config;
+ int ret;
+
+ ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ config = chip->config &= ~ADT7310_EVENT_MODE;
+ if (strcmp(buf, "comparator") != 0)
+ config |= ADT7310_EVENT_MODE;
+
+ ret = adt7310_spi_write_byte(chip, ADT7310_CONFIG, config);
+ if (ret)
+ return -EIO;
+
+ chip->config = config;
+
+ return len;
+}
+
+static ssize_t adt7310_show_available_event_modes(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "comparator\ninterrupt\n");
+}
+
+static ssize_t adt7310_show_fault_queue(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7310_chip_info *chip = dev_info->dev_data;
+ int ret;
+
+ ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ return sprintf(buf, "%d\n", chip->config & ADT7310_FAULT_QUEUE_MASK);
+}
+
+static ssize_t adt7310_set_fault_queue(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7310_chip_info *chip = dev_info->dev_data;
+ unsigned long data;
+ int ret;
+ u8 config;
+
+ ret = strict_strtoul(buf, 10, &data);
+ if (ret || data > 3)
+ return -EINVAL;
+
+ ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
+ if (ret)
+ return -EIO;
+
+ config = chip->config & ~ADT7310_FAULT_QUEUE_MASK;
+ config |= data;
+ ret = adt7310_spi_write_byte(chip, ADT7310_CONFIG, config);
+ if (ret)
+ return -EIO;
+
+ chip->config = config;
+
+ return len;
+}
+
+static inline ssize_t adt7310_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 adt7310_chip_info *chip = dev_info->dev_data;
+ u16 data;
+ int ret;
+
+ ret = adt7310_spi_read_word(chip, bound_reg, &data);
+ if (ret)
+ return -EIO;
+
+ return adt7310_convert_temperature(chip, data, buf);
+}
+
+static inline ssize_t adt7310_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 adt7310_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 < -128)
+ return -EINVAL;
+
+ if (pos) {
+ len = strlen(pos);
+
+ if (chip->config & ADT7310_RESOLUTION) {
+ if (len > ADT7310_T16_VALUE_FLOAT_OFFSET)
+ len = ADT7310_T16_VALUE_FLOAT_OFFSET;
+ pos[len] = 0;
+ ret = strict_strtol(pos, 10, &tmp2);
+
+ if (!ret)
+ tmp2 = (tmp2 / 78125) * 78125;
+ } else {
+ if (len > ADT7310_T13_VALUE_FLOAT_OFFSET)
+ len = ADT7310_T13_VALUE_FLOAT_OFFSET;
+ pos[len] = 0;
+ ret = strict_strtol(pos, 10, &tmp2);
+
+ if (!ret)
+ tmp2 = (tmp2 / 625) * 625;
+ }
+ }
+
+ if (tmp1 < 0)
+ data = (u16)(-tmp1);
+ else
+ data = (u16)tmp1;
+
+ if (chip->config & ADT7310_RESOLUTION) {
+ data = (data << ADT7310_T16_VALUE_FLOAT_OFFSET) |
+ (tmp2 & ADT7310_T16_VALUE_FLOAT_MASK);
+
+ if (tmp1 < 0)
+ /* convert positive value to supplyment */
+ data = (u16)((ADT7310_T16_VALUE_SIGN << 1) - (u32)data);
+ } else {
+ data = (data << ADT7310_T13_VALUE_FLOAT_OFFSET) |
+ (tmp2 & ADT7310_T13_VALUE_FLOAT_MASK);
+
+ if (tmp1 < 0)
+ /* convert positive value to supplyment */
+ data = (ADT7310_T13_VALUE_SIGN << 1) - data;
+ data <<= ADT7310_T13_VALUE_OFFSET;
+ }
+
+ ret = adt7310_spi_write_word(chip, bound_reg, data);
+ if (ret)
+ return -EIO;
+
+ return len;
+}
+
+static ssize_t adt7310_show_t_alarm_high(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return adt7310_show_t_bound(dev, attr,
+ ADT7310_T_ALARM_HIGH, buf);
+}
+
+static inline ssize_t adt7310_set_t_alarm_high(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ return adt7310_set_t_bound(dev, attr,
+ ADT7310_T_ALARM_HIGH, buf, len);
+}
+
+static ssize_t adt7310_show_t_alarm_low(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return adt7310_show_t_bound(dev, attr,
+ ADT7310_T_ALARM_LOW, buf);
+}
+
+static inline ssize_t adt7310_set_t_alarm_low(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ return adt7310_set_t_bound(dev, attr,
+ ADT7310_T_ALARM_LOW, buf, len);
+}
+
+static ssize_t adt7310_show_t_crit(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return adt7310_show_t_bound(dev, attr,
+ ADT7310_T_CRIT, buf);
+}
+
+static inline ssize_t adt7310_set_t_crit(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ return adt7310_set_t_bound(dev, attr,
+ ADT7310_T_CRIT, buf, len);
+}
+
+static ssize_t adt7310_show_t_hyst(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct adt7310_chip_info *chip = dev_info->dev_data;
+ int ret;
+ u8 t_hyst;
+
+ ret = adt7310_spi_read_byte(chip, ADT7310_T_HYST, &t_hyst);
+ if (ret)
+ return -EIO;
+
+ return sprintf(buf, "%d\n", t_hyst & ADT7310_T_HYST_MASK);
+}
+
+static inline ssize_t adt7310_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 adt7310_chip_info *chip = dev_info->dev_data;
+ int ret;
+ unsigned long data;
+ u8 t_hyst;
+
+ ret = strict_strtol(buf, 10, &data);
+
+ if (ret || data > ADT7310_T_HYST_MASK)
+ return -EINVAL;
+
+ t_hyst = (u8)data;
+
+ ret = adt7310_spi_write_byte(chip, ADT7310_T_HYST, t_hyst);
+ if (ret)
+ return -EIO;
+
+ return len;
+}
+
+IIO_EVENT_ATTR_SH(event_mode, iio_event_adt7310,
+ adt7310_show_event_mode, adt7310_set_event_mode, 0);
+IIO_EVENT_ATTR_SH(available_event_modes, iio_event_adt7310,
+ adt7310_show_available_event_modes, NULL, 0);
+IIO_EVENT_ATTR_SH(fault_queue, iio_event_adt7310,
+ adt7310_show_fault_queue, adt7310_set_fault_queue, 0);
+IIO_EVENT_ATTR_SH(t_alarm_high, iio_event_adt7310,
+ adt7310_show_t_alarm_high, adt7310_set_t_alarm_high, 0);
+IIO_EVENT_ATTR_SH(t_alarm_low, iio_event_adt7310,
+ adt7310_show_t_alarm_low, adt7310_set_t_alarm_low, 0);
+IIO_EVENT_ATTR_SH(t_crit, iio_event_adt7310_ct,
+ adt7310_show_t_crit, adt7310_set_t_crit, 0);
+IIO_EVENT_ATTR_SH(t_hyst, iio_event_adt7310,
+ adt7310_show_t_hyst, adt7310_set_t_hyst, 0);
+
+static struct attribute *adt7310_event_int_attributes[] = {
+ &iio_event_attr_event_mode.dev_attr.attr,
+ &iio_event_attr_available_event_modes.dev_attr.attr,
+ &iio_event_attr_fault_queue.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_hyst.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute *adt7310_event_ct_attributes[] = {
+ &iio_event_attr_event_mode.dev_attr.attr,
+ &iio_event_attr_available_event_modes.dev_attr.attr,
+ &iio_event_attr_fault_queue.dev_attr.attr,
+ &iio_event_attr_t_crit.dev_attr.attr,
+ &iio_event_attr_t_hyst.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group adt7310_event_attribute_group[ADT7310_IRQS] = {
+ {
+ .attrs = adt7310_event_int_attributes,
+ },
+ {
+ .attrs = adt7310_event_ct_attributes,
+ }
+};
+
+/*
+ * device probe and remove
+ */
+
+static int __devinit adt7310_probe(struct spi_device *spi_dev)
+{
+ struct adt7310_chip_info *chip;
+ int ret = 0;
+ unsigned long *adt7310_platform_data = spi_dev->dev.platform_data;
+ unsigned long irq_flags;
+
+ chip = kzalloc(sizeof(struct adt7310_chip_info), GFP_KERNEL);
+
+ if (chip == NULL)
+ return -ENOMEM;
+
+ /* this is only used for device removal purposes */
+ dev_set_drvdata(&spi_dev->dev, chip);
+
+ chip->spi_dev = spi_dev;
+ chip->name = spi_dev->modalias;
+
+ chip->indio_dev = iio_allocate_device();
+ if (chip->indio_dev == NULL) {
+ ret = -ENOMEM;
+ goto error_free_chip;
+ }
+
+ chip->indio_dev->dev.parent = &spi_dev->dev;
+ chip->indio_dev->attrs = &adt7310_attribute_group;
+ chip->indio_dev->event_attrs = adt7310_event_attribute_group;
+ chip->indio_dev->dev_data = (void *)chip;
+ chip->indio_dev->driver_module = THIS_MODULE;
+ chip->indio_dev->num_interrupt_lines = ADT7310_IRQS;
+ chip->indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = iio_device_register(chip->indio_dev);
+ if (ret)
+ goto error_free_dev;
+
+ /* CT critcal temperature event. line 0 */
+ if (spi_dev->irq) {
+ if (adt7310_platform_data[2])
+ irq_flags = adt7310_platform_data[2];
+ else
+ irq_flags = IRQF_TRIGGER_LOW;
+ ret = iio_register_interrupt_line(spi_dev->irq,
+ chip->indio_dev,
+ 0,
+ irq_flags,
+ chip->name);
+ if (ret)
+ goto error_unreg_dev;
+
+ /*
+ * The event handler list element refer to iio_event_adt7310.
+ * All event attributes bind to the same event handler.
+ * One event handler can only be added to one event list.
+ */
+ iio_add_event_to_list(&iio_event_adt7310,
+ &chip->indio_dev->interrupts[0]->ev_list);
+ }
+
+ /* INT bound temperature alarm event. line 1 */
+ if (adt7310_platform_data[0]) {
+ ret = iio_register_interrupt_line(adt7310_platform_data[0],
+ chip->indio_dev,
+ 1,
+ adt7310_platform_data[1],
+ chip->name);
+ if (ret)
+ goto error_unreg_ct_irq;
+
+ /*
+ * The event handler list element refer to iio_event_adt7310.
+ * All event attributes bind to the same event handler.
+ * One event handler can only be added to one event list.
+ */
+ iio_add_event_to_list(&iio_event_adt7310_ct,
+ &chip->indio_dev->interrupts[1]->ev_list);
+ }
+
+ if (spi_dev->irq && adt7310_platform_data[0]) {
+ INIT_WORK(&chip->thresh_work, adt7310_interrupt_bh);
+
+ ret = adt7310_spi_read_byte(chip, ADT7310_CONFIG, &chip->config);
+ if (ret) {
+ ret = -EIO;
+ goto error_unreg_int_irq;
+ }
+
+ /* set irq polarity low level */
+ chip->config &= ~ADT7310_CT_POLARITY;
+
+ if (adt7310_platform_data[1] & IRQF_TRIGGER_HIGH)
+ chip->config |= ADT7310_INT_POLARITY;
+ else
+ chip->config &= ~ADT7310_INT_POLARITY;
+
+ ret = adt7310_spi_write_byte(chip, ADT7310_CONFIG, chip->config);
+ if (ret) {
+ ret = -EIO;
+ goto error_unreg_int_irq;
+ }
+ }
+
+ dev_info(&spi_dev->dev, "%s temperature sensor registered.\n",
+ chip->name);
+
+ return 0;
+
+error_unreg_int_irq:
+ iio_unregister_interrupt_line(chip->indio_dev, 1);
+error_unreg_ct_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 adt7310_remove(struct spi_device *spi_dev)
+{
+ struct adt7310_chip_info *chip = dev_get_drvdata(&spi_dev->dev);
+ struct iio_dev *indio_dev = chip->indio_dev;
+ unsigned long *adt7310_platform_data = spi_dev->dev.platform_data;
+
+ dev_set_drvdata(&spi_dev->dev, NULL);
+ if (adt7310_platform_data[0])
+ iio_unregister_interrupt_line(indio_dev, 1);
+ if (spi_dev->irq)
+ iio_unregister_interrupt_line(indio_dev, 0);
+ iio_device_unregister(indio_dev);
+ iio_free_device(chip->indio_dev);
+ kfree(chip);
+
+ return 0;
+}
+
+static const struct spi_device_id adt7310_id[] = {
+ { "adt7310", 0 },
+ {}
+};
+
+MODULE_DEVICE_TABLE(spi, adt7310_id);
+
+static struct spi_driver adt7310_driver = {
+ .driver = {
+ .name = "adt7310",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = adt7310_probe,
+ .remove = __devexit_p(adt7310_remove),
+ .id_table = adt7310_id,
+};
+
+static __init int adt7310_init(void)
+{
+ return spi_register_driver(&adt7310_driver);
+}
+
+static __exit void adt7310_exit(void)
+{
+ spi_unregister_driver(&adt7310_driver);
+}
+
+MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
+MODULE_DESCRIPTION("Analog Devices ADT7310 digital"
+ " temperature sensor driver");
+MODULE_LICENSE("GPL v2");
+
+module_init(adt7310_init);
+module_exit(adt7310_exit);
projects / mv-sheeva.git / blobdiff