+++ /dev/null
-/*
- * ADT75 digital temperature sensor driver supporting ADT75
- *
- * Copyright 2010 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/interrupt.h>
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/sysfs.h>
-#include <linux/i2c.h>
-#include <linux/module.h>
-
-#include "../iio.h"
-#include "../sysfs.h"
-
-/*
- * ADT75 registers definition
- */
-
-#define ADT75_TEMPERATURE 0
-#define ADT75_CONFIG 1
-#define ADT75_T_HYST 2
-#define ADT75_T_OS 3
-#define ADT75_ONESHOT 4
-
-/*
- * ADT75 config
- */
-#define ADT75_PD 0x1
-#define ADT75_OS_INT 0x2
-#define ADT75_OS_POLARITY 0x4
-#define ADT75_FAULT_QUEUE_MASK 0x18
-#define ADT75_FAULT_QUEUE_OFFSET 3
-#define ADT75_SMBUS_ALART 0x8
-
-/*
- * ADT75 masks
- */
-#define ADT75_VALUE_SIGN 0x800
-#define ADT75_VALUE_OFFSET 4
-#define ADT75_VALUE_FLOAT_OFFSET 4
-#define ADT75_VALUE_FLOAT_MASK 0xF
-
-
-/*
- * struct adt75_chip_info - chip specifc information
- */
-
-struct adt75_chip_info {
- struct i2c_client *client;
- u8 config;
-};
-
-/*
- * adt75 register access by I2C
- */
-
-static int adt75_i2c_read(struct iio_dev *dev_info, u8 reg, u8 *data)
-{
- struct adt75_chip_info *chip = iio_priv(dev_info);
- struct i2c_client *client = chip->client;
- int ret = 0, len;
-
- ret = i2c_smbus_write_byte(client, reg);
- if (ret < 0) {
- dev_err(&client->dev, "I2C read register address error\n");
- return ret;
- }
-
- if (reg == ADT75_CONFIG || reg == ADT75_ONESHOT)
- len = 1;
- else
- len = 2;
-
- ret = i2c_master_recv(client, data, len);
- if (ret < 0) {
- dev_err(&client->dev, "I2C read error\n");
- return ret;
- }
-
- return ret;
-}
-
-static int adt75_i2c_write(struct iio_dev *dev_info, u8 reg, u8 data)
-{
- struct adt75_chip_info *chip = iio_priv(dev_info);
- struct i2c_client *client = chip->client;
- int ret = 0;
-
- if (reg == ADT75_CONFIG || reg == ADT75_ONESHOT)
- ret = i2c_smbus_write_byte_data(client, reg, data);
- else
- ret = i2c_smbus_write_word_data(client, reg, data);
-
- if (ret < 0)
- dev_err(&client->dev, "I2C write error\n");
-
- return ret;
-}
-
-static ssize_t adt75_show_mode(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct adt75_chip_info *chip = iio_priv(dev_get_drvdata(dev));
-
- if (chip->config & ADT75_PD)
- return sprintf(buf, "power-save\n");
- else
- return sprintf(buf, "full\n");
-}
-
-static ssize_t adt75_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 adt75_chip_info *chip = iio_priv(dev_info);
- int ret;
- u8 config;
-
- ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
- if (ret)
- return -EIO;
-
- config = chip->config & ~ADT75_PD;
- if (!strcmp(buf, "full"))
- config |= ADT75_PD;
-
- ret = adt75_i2c_write(dev_info, ADT75_CONFIG, config);
- if (ret)
- return -EIO;
-
- chip->config = config;
-
- return ret;
-}
-
-static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
- adt75_show_mode,
- adt75_store_mode,
- 0);
-
-static ssize_t adt75_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, adt75_show_available_modes, NULL, 0);
-
-static ssize_t adt75_show_oneshot(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct adt75_chip_info *chip = iio_priv(dev_get_drvdata(dev));
-
- return sprintf(buf, "%d\n", !!(chip->config & ADT75_ONESHOT));
-}
-
-static ssize_t adt75_store_oneshot(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct adt75_chip_info *chip = iio_priv(dev_info);
- unsigned long data = 0;
- int ret;
- u8 config;
-
- ret = strict_strtoul(buf, 10, &data);
- if (ret)
- return -EINVAL;
-
-
- ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
- if (ret)
- return -EIO;
-
- config = chip->config & ~ADT75_ONESHOT;
- if (data)
- config |= ADT75_ONESHOT;
-
- ret = adt75_i2c_write(dev_info, ADT75_CONFIG, config);
- if (ret)
- return -EIO;
-
- chip->config = config;
-
- return ret;
-}
-
-static IIO_DEVICE_ATTR(oneshot, S_IRUGO | S_IWUSR,
- adt75_show_oneshot,
- adt75_store_oneshot,
- 0);
-
-static ssize_t adt75_show_value(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct adt75_chip_info *chip = iio_priv(dev_info);
- u16 data;
- char sign = ' ';
- int ret;
-
- if (chip->config & ADT75_PD) {
- dev_err(dev, "Can't read value in power-down mode.\n");
- return -EIO;
- }
-
- if (chip->config & ADT75_ONESHOT) {
- /* write to active converter */
- ret = i2c_smbus_write_byte(chip->client, ADT75_ONESHOT);
- if (ret)
- return -EIO;
- }
-
- ret = adt75_i2c_read(dev_info, ADT75_TEMPERATURE, (u8 *)&data);
- if (ret)
- return -EIO;
-
- data = swab16(data) >> ADT75_VALUE_OFFSET;
- if (data & ADT75_VALUE_SIGN) {
- /* convert supplement to positive value */
- data = (ADT75_VALUE_SIGN << 1) - data;
- sign = '-';
- }
-
- return sprintf(buf, "%c%d.%.4d\n", sign,
- (data >> ADT75_VALUE_FLOAT_OFFSET),
- (data & ADT75_VALUE_FLOAT_MASK) * 625);
-}
-
-static IIO_DEVICE_ATTR(value, S_IRUGO, adt75_show_value, NULL, 0);
-
-static struct attribute *adt75_attributes[] = {
- &iio_dev_attr_available_modes.dev_attr.attr,
- &iio_dev_attr_mode.dev_attr.attr,
- &iio_dev_attr_oneshot.dev_attr.attr,
- &iio_dev_attr_value.dev_attr.attr,
- NULL,
-};
-
-static const struct attribute_group adt75_attribute_group = {
- .attrs = adt75_attributes,
-};
-
-/*
- * temperature bound events
- */
-
-#define IIO_EVENT_CODE_ADT75_OTI IIO_UNMOD_EVENT_CODE(IIO_TEMP, \
- 0, \
- IIO_EV_TYPE_THRESH, \
- IIO_EV_DIR_FALLING)
-
-static irqreturn_t adt75_event_handler(int irq, void *private)
-{
- iio_push_event(private,
- IIO_EVENT_CODE_ADT75_OTI,
- iio_get_time_ns());
-
- return IRQ_HANDLED;
-}
-
-static ssize_t adt75_show_oti_mode(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct adt75_chip_info *chip = iio_priv(dev_info);
- int ret;
-
- /* retrive ALART status */
- ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
- if (ret)
- return -EIO;
-
- if (chip->config & ADT75_OS_INT)
- return sprintf(buf, "interrupt\n");
- else
- return sprintf(buf, "comparator\n");
-}
-
-static ssize_t adt75_set_oti_mode(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct adt75_chip_info *chip = iio_priv(dev_info);
- int ret;
- u8 config;
-
- /* retrive ALART status */
- ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
- if (ret)
- return -EIO;
-
- config = chip->config & ~ADT75_OS_INT;
- if (strcmp(buf, "comparator") != 0)
- config |= ADT75_OS_INT;
-
- ret = adt75_i2c_write(dev_info, ADT75_CONFIG, config);
- if (ret)
- return -EIO;
-
- chip->config = config;
-
- return ret;
-}
-
-static ssize_t adt75_show_available_oti_modes(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "comparator\ninterrupt\n");
-}
-
-static ssize_t adt75_show_smbus_alart(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct adt75_chip_info *chip = iio_priv(dev_info);
- int ret;
-
- /* retrive ALART status */
- ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
- if (ret)
- return -EIO;
-
- return sprintf(buf, "%d\n", !!(chip->config & ADT75_SMBUS_ALART));
-}
-
-static ssize_t adt75_set_smbus_alart(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct adt75_chip_info *chip = iio_priv(dev_info);
- unsigned long data = 0;
- int ret;
- u8 config;
-
- ret = strict_strtoul(buf, 10, &data);
- if (ret)
- return -EINVAL;
-
- /* retrive ALART status */
- ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
- if (ret)
- return -EIO;
-
- config = chip->config & ~ADT75_SMBUS_ALART;
- if (data)
- config |= ADT75_SMBUS_ALART;
-
- ret = adt75_i2c_write(dev_info, ADT75_CONFIG, config);
- if (ret)
- return -EIO;
-
- chip->config = config;
-
- return ret;
-}
-
-static ssize_t adt75_show_fault_queue(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- struct adt75_chip_info *chip = iio_priv(dev_info);
- int ret;
-
- /* retrive ALART status */
- ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
- if (ret)
- return -EIO;
-
- return sprintf(buf, "%d\n", (chip->config & ADT75_FAULT_QUEUE_MASK) >>
- ADT75_FAULT_QUEUE_OFFSET);
-}
-
-static ssize_t adt75_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 adt75_chip_info *chip = iio_priv(dev_info);
- unsigned long data;
- int ret;
- u8 config;
-
- ret = strict_strtoul(buf, 10, &data);
- if (ret || data > 3)
- return -EINVAL;
-
- /* retrive ALART status */
- ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
- if (ret)
- return -EIO;
-
- config = chip->config & ~ADT75_FAULT_QUEUE_MASK;
- config |= (data << ADT75_FAULT_QUEUE_OFFSET);
- ret = adt75_i2c_write(dev_info, ADT75_CONFIG, config);
- if (ret)
- return -EIO;
-
- chip->config = config;
-
- return ret;
-}
-static inline ssize_t adt75_show_t_bound(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- u16 data;
- char sign = ' ';
- int ret;
-
- ret = adt75_i2c_read(dev_info, this_attr->address, (u8 *)&data);
- if (ret)
- return -EIO;
-
- data = swab16(data) >> ADT75_VALUE_OFFSET;
- if (data & ADT75_VALUE_SIGN) {
- /* convert supplement to positive value */
- data = (ADT75_VALUE_SIGN << 1) - data;
- sign = '-';
- }
-
- return sprintf(buf, "%c%d.%.4d\n", sign,
- (data >> ADT75_VALUE_FLOAT_OFFSET),
- (data & ADT75_VALUE_FLOAT_MASK) * 625);
-}
-
-static inline ssize_t adt75_set_t_bound(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- struct iio_dev *dev_info = dev_get_drvdata(dev);
- 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 > ADT75_VALUE_FLOAT_OFFSET)
- len = ADT75_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;
- data = (data << ADT75_VALUE_FLOAT_OFFSET) | (tmp2 & ADT75_VALUE_FLOAT_MASK);
- if (tmp1 < 0)
- /* convert positive value to supplyment */
- data = (ADT75_VALUE_SIGN << 1) - data;
- data <<= ADT75_VALUE_OFFSET;
- data = swab16(data);
-
- ret = adt75_i2c_write(dev_info, this_attr->address, (u8)data);
- if (ret)
- return -EIO;
-
- return ret;
-}
-
-
-static IIO_DEVICE_ATTR(oti_mode,
- S_IRUGO | S_IWUSR,
- adt75_show_oti_mode, adt75_set_oti_mode, 0);
-static IIO_DEVICE_ATTR(available_oti_modes,
- S_IRUGO,
- adt75_show_available_oti_modes, NULL, 0);
-static IIO_DEVICE_ATTR(smbus_alart,
- S_IRUGO | S_IWUSR,
- adt75_show_smbus_alart, adt75_set_smbus_alart, 0);
-static IIO_DEVICE_ATTR(fault_queue,
- S_IRUGO | S_IWUSR,
- adt75_show_fault_queue, adt75_set_fault_queue, 0);
-static IIO_DEVICE_ATTR(t_os_value,
- S_IRUGO | S_IWUSR,
- adt75_show_t_bound, adt75_set_t_bound,
- ADT75_T_OS);
-static IIO_DEVICE_ATTR(t_hyst_value,
- S_IRUGO | S_IWUSR,
- adt75_show_t_bound, adt75_set_t_bound,
- ADT75_T_HYST);
-
-static struct attribute *adt75_event_attributes[] = {
- &iio_dev_attr_oti_mode.dev_attr.attr,
- &iio_dev_attr_available_oti_modes.dev_attr.attr,
- &iio_dev_attr_smbus_alart.dev_attr.attr,
- &iio_dev_attr_fault_queue.dev_attr.attr,
- &iio_dev_attr_t_os_value.dev_attr.attr,
- &iio_dev_attr_t_hyst_value.dev_attr.attr,
- NULL,
-};
-
-static struct attribute_group adt75_event_attribute_group = {
- .attrs = adt75_event_attributes,
- .name = "events",
-};
-
-static const struct iio_info adt75_info = {
- .attrs = &adt75_attribute_group,
- .event_attrs = &adt75_event_attribute_group,
- .driver_module = THIS_MODULE,
-};
-
-/*
- * device probe and remove
- */
-
-static int __devinit adt75_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- struct adt75_chip_info *chip;
- struct iio_dev *indio_dev;
- int ret = 0;
-
- indio_dev = iio_allocate_device(sizeof(*chip));
- if (indio_dev == NULL) {
- ret = -ENOMEM;
- goto error_ret;
- }
- chip = iio_priv(indio_dev);
-
- /* this is only used for device removal purposes */
- i2c_set_clientdata(client, indio_dev);
-
- chip->client = client;
-
- indio_dev->name = id->name;
- indio_dev->dev.parent = &client->dev;
- indio_dev->info = &adt75_info;
- indio_dev->modes = INDIO_DIRECT_MODE;
-
- if (client->irq > 0) {
- ret = request_threaded_irq(client->irq,
- NULL,
- &adt75_event_handler,
- IRQF_TRIGGER_LOW,
- indio_dev->name,
- indio_dev);
- if (ret)
- goto error_free_dev;
-
- ret = adt75_i2c_read(indio_dev, ADT75_CONFIG, &chip->config);
- if (ret) {
- ret = -EIO;
- goto error_unreg_irq;
- }
-
- /* set irq polarity low level */
- chip->config &= ~ADT75_OS_POLARITY;
-
- ret = adt75_i2c_write(indio_dev, ADT75_CONFIG, chip->config);
- if (ret) {
- ret = -EIO;
- goto error_unreg_irq;
- }
- }
-
- ret = iio_device_register(indio_dev);
- if (ret)
- goto error_unreg_irq;
-
- dev_info(&client->dev, "%s temperature sensor registered.\n",
- indio_dev->name);
-
- return 0;
-error_unreg_irq:
- free_irq(client->irq, indio_dev);
-error_free_dev:
- iio_free_device(indio_dev);
-error_ret:
- return ret;
-}
-
-static int __devexit adt75_remove(struct i2c_client *client)
-{
- struct iio_dev *indio_dev = i2c_get_clientdata(client);
-
- if (client->irq)
- free_irq(client->irq, indio_dev);
- iio_device_unregister(indio_dev);
-
- return 0;
-}
-
-static const struct i2c_device_id adt75_id[] = {
- { "adt75", 0 },
- {}
-};
-
-MODULE_DEVICE_TABLE(i2c, adt75_id);
-
-static struct i2c_driver adt75_driver = {
- .driver = {
- .name = "adt75",
- },
- .probe = adt75_probe,
- .remove = __devexit_p(adt75_remove),
- .id_table = adt75_id,
-};
-
-static __init int adt75_init(void)
-{
- return i2c_add_driver(&adt75_driver);
-}
-
-static __exit void adt75_exit(void)
-{
- i2c_del_driver(&adt75_driver);
-}
-
-MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
-MODULE_DESCRIPTION("Analog Devices ADT75 digital"
- " temperature sensor driver");
-MODULE_LICENSE("GPL v2");
-
-module_init(adt75_init);
-module_exit(adt75_exit);
projects / platform / kernel / linux-rpi.git / commitdiff