From: Sonic Zhang <sonic.zhang@xxxxxxxxxx> Signed-off-by: Sonic Zhang <sonic.zhang@xxxxxxxxxx> Signed-off-by: Mike Frysinger <vapier@xxxxxxxxxx> --- drivers/staging/iio/adc/Kconfig | 7 + drivers/staging/iio/adc/Makefile | 1 + drivers/staging/iio/adc/adt7408.c | 1006 +++++++++++++++++++++++++++++++++++++ 3 files changed, 1014 insertions(+), 0 deletions(-) create mode 100644 drivers/staging/iio/adc/adt7408.c diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig index 5d13918..ea75700 100644 --- a/drivers/staging/iio/adc/Kconfig +++ b/drivers/staging/iio/adc/Kconfig @@ -114,3 +114,10 @@ config ADT7408 help Say yes here to build support for Analog Devices ADT7408 temperature sensors. + +config ADT7410 + tristate "Analog Devices ADT7410 temperature sensor driver" + depends on I2C + help + Say yes here to build support for Analog Devices ADT7410 + temperature sensors. diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile index 6c11363..dc2bdbe 100644 --- a/drivers/staging/iio/adc/Makefile +++ b/drivers/staging/iio/adc/Makefile @@ -21,3 +21,4 @@ obj-$(CONFIG_AD774X) += ad774x.o obj-$(CONFIG_AD7816) += ad7816.o obj-$(CONFIG_ADT75) += adt75.o obj-$(CONFIG_ADT7310) += adt7310.o +obj-$(CONFIG_ADT7408) += adt7408.o diff --git a/drivers/staging/iio/adc/adt7408.c b/drivers/staging/iio/adc/adt7408.c new file mode 100644 index 0000000..25bd594 --- /dev/null +++ b/drivers/staging/iio/adc/adt7408.c @@ -0,0 +1,1006 @@ +/* + * 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/slab.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_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 work_struct thresh_work; + 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 = swab16((u16)ret); + + 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, swab16(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; +} + +static 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"); +} + +static 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); +} + +static 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); +} + +static 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); +} + +static 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 = (ADT7408_T_VALUE_SIGN << 1) - data; + sign = '-'; + } + + return sprintf(buf, "%c%d.%.4d\n", sign, + (data >> ADT7408_T_VALUE_FLOAT_OFFSET), + (data & ADT7408_T_VALUE_FLOAT_MASK) * 625); +} + +static 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); +} + +static 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 adt7408_chip_info *chip = + container_of(work_s, struct adt7408_chip_info, thresh_work); + 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_CRIT) + 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->thresh_work); + + 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 = 0; + 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 = (ADT7408_BOUND_VALUE_SIGN << 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 < -128) + 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 = (u16)(-tmp1); + else + data = (u16)tmp1; + data = (data << ADT7408_BOUND_VALUE_FLOAT_OFFSET) | + (tmp2 & ADT7408_BOUND_VALUE_FLOAT_MASK); + if (tmp1 < 0) + /* convert positive value to supplyment */ + data = (ADT7408_BOUND_VALUE_SIGN << 1) - data; + data <<= ADT7408_BOUND_VALUE_OFFSET; + + ret = adt7408_i2c_write(chip, bound_reg, 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; + + 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) { + ret = iio_register_interrupt_line(client->irq, + chip->indio_dev, + 0, + client->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); + + INIT_WORK(&chip->thresh_work, adt7408_interrupt_bh); + + ret = adt7408_i2c_read(chip, ADT7408_CONFIG, &chip->config); + if (ret) { + ret = -EIO; + goto error_unreg_irq; + } + + if (client->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) + 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 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 <sonic.zhang@xxxxxxxxxx>"); +MODULE_DESCRIPTION("Analog Devices ADT7408 digital" + " temperature sensor driver"); +MODULE_LICENSE("GPL v2"); + +module_init(adt7408_init); +module_exit(adt7408_exit); -- 1.7.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html