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/ad7414.c | 573 ++++++++++++++++++++++++++++++++++++++
3 files changed, 581 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/iio/adc/ad7414.c
diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig
index 4e7b6a8..5093901 100644
--- a/drivers/staging/iio/adc/Kconfig
+++ b/drivers/staging/iio/adc/Kconfig
@@ -62,6 +62,13 @@ config AD7314
Say yes here to build support for Analog Devices AD7314
temperature sensors.
+config AD7414
+ tristate "Analog Devices AD7414 and AD7415 temperature sensor driver"
+ depends on I2C
+ help
+ Say yes here to build support for Analog Devices AD7414 and AD7415
+ temperature sensors.
+
config AD799X
tristate "Analog Devices AD799x ADC driver"
depends on I2C
diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile
index 36e66f9..0e6c1ae 100644
--- a/drivers/staging/iio/adc/Makefile
+++ b/drivers/staging/iio/adc/Makefile
@@ -20,3 +20,4 @@ obj-$(CONFIG_AD7152) += ad7152.o
obj-$(CONFIG_AD7291) += ad7291.o
obj-$(CONFIG_AD7298) += ad7298.o
obj-$(CONFIG_AD7314) += ad7314.o
+obj-$(CONFIG_AD7414) += ad7414.o
diff --git a/drivers/staging/iio/adc/ad7414.c b/drivers/staging/iio/adc/ad7414.c
new file mode 100644
index 0000000..150aa06
--- /dev/null
+++ b/drivers/staging/iio/adc/ad7414.c
@@ -0,0 +1,573 @@
+/*
+ * AD7414 digital temperature sensor driver supporting AD7414 and AD7415
+ *
+ * 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"
+
+/*
+ * AD7414 registers definition
+ */
+
+#define AD7414_TEMPERATURE 0
+#define AD7414_CONFIG 1
+#define AD7414_TEMPERATURE_HIGH 2
+#define AD7414_TEMPERATURE_LOW 3
+
+/*
+ * AD7414 config bits
+ */
+#define AD7414_TEST_MODE 0x3
+#define AD7414_ONE_SHOT 0x4
+#define AD7414_ALERT_RESET 0x8
+#define AD7414_ALERT_POLARITY 0x10
+#define AD7414_ALERT_EN 0x20
+#define AD7414_FLTR 0x40
+#define AD7414_PD 0x80
+
+/*
+ * AD7414 masks
+ */
+#define AD7414_TEMP_SIGN 0x200
+#define AD7414_TEMP_MASK 0xFFC0
+#define AD7414_TEMP_OFFSET 6
+#define AD7414_ALERT_FLAG 0x20
+#define AD7414_T_SIGN 0x80
+#define AD7414_T_HIGH_FLAG 0x10
+#define AD7414_T_LOW_FLAG 0x8
+
+
+/*
+ * struct ad7414_chip_info - chip specifc information
+ */
+
+struct ad7414_chip_info {
+ const char *name;
+ struct i2c_client *client;
+ struct iio_dev *indio_dev;
+ struct work_struct thresh_work;
+ s64 last_timestamp;
+ u8 mode;
+};
+
+/*
+ * ad7414 register access by I2C
+ */
+
+static int ad7414_i2c_read(struct ad7414_chip_info *chip, u8 reg, u8 *data)
+{
+ 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 == AD7414_TEMPERATURE)
+ len = 2;
+ else
+ len = 1;
+
+ ret = i2c_master_recv(client, data, len);
+ if (ret < 0) {
+ dev_err(&client->dev, "I2C read error\n");
+ return ret;
+ }
+
+ return ret;
+}
+
+static int ad7414_i2c_write(struct ad7414_chip_info *chip, u8 reg, u8 data)
+{
+ struct i2c_client *client = chip->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 ssize_t ad7414_show_mode(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad7414_chip_info *chip = dev_info->dev_data;
+
+ if (chip->mode)
+ return sprintf(buf, "power-save\n");
+ else
+ return sprintf(buf, "full\n");
+}
+
+static ssize_t ad7414_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 ad7414_chip_info *chip = dev_info->dev_data;
+ u8 config;
+ int ret;
+
+ ret = ad7414_i2c_read(chip, AD7414_CONFIG, &config);
+ if (ret)
+ return -EIO;
+
+ if (strcmp(buf, "full")) {
+ chip->mode = 0;
+ config &= ~AD7414_PD;
+ } else {
+ chip->mode = 1;
+ config |= AD7414_PD;
+ }
+
+ ret = ad7414_i2c_write(chip, AD7414_CONFIG, config);
+ if (ret)
+ return -EIO;
+
+ return ret;
+}
+
+static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
+ ad7414_show_mode,
+ ad7414_store_mode,
+ 0);
+
+static ssize_t ad7414_show_available_modes(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "full\npower-save\n");
+}
+
+static IIO_DEVICE_ATTR(available_modes, S_IRUGO, ad7414_show_available_modes, NULL, 0);
+
+static ssize_t ad7414_show_temperature(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad7414_chip_info *chip = dev_info->dev_data;
+ u8 config;
+ u16 data;
+ char sign = ' ';
+ int ret;
+
+ if (chip->mode) {
+ ret = ad7414_i2c_read(chip, AD7414_CONFIG, &config);
+ if (ret)
+ return -EIO;
+ ret = ad7414_i2c_write(chip, AD7414_CONFIG,
+ config | AD7414_ONE_SHOT);
+ if (ret)
+ return -EIO;
+ }
+
+ ret = ad7414_i2c_read(chip, AD7414_TEMPERATURE, (u8 *)&data);
+ if (ret)
+ return -EIO;
+
+ data = swab16(data) >> AD7414_TEMP_OFFSET;
+ if (data & AD7414_TEMP_SIGN) {
+ data = (AD7414_TEMP_SIGN << 1) - data;
+ sign = '-';
+ }
+
+ return sprintf(buf, "%c%d.%.2d\n", sign, (data >> 2), (data & 3) * 25);
+}
+
+static IIO_DEVICE_ATTR(temperature, S_IRUGO, ad7414_show_temperature, NULL, 0);
+
+static ssize_t ad7414_show_name(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad7414_chip_info *chip = dev_info->dev_data;
+ return sprintf(buf, "%s\n", chip->name);
+}
+
+static IIO_DEVICE_ATTR(name, S_IRUGO, ad7414_show_name, NULL, 0);
+
+static struct attribute *ad7414_attributes[] = {
+ &iio_dev_attr_available_modes.dev_attr.attr,
+ &iio_dev_attr_mode.dev_attr.attr,
+ &iio_dev_attr_temperature.dev_attr.attr,
+ &iio_dev_attr_name.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ad7414_attribute_group = {
+ .attrs = ad7414_attributes,
+};
+
+/*
+ * temperature bound events
+ */
+
+#define IIO_EVENT_CODE_AD7414_T_HIGH IIO_BUFFER_EVENT_CODE(0)
+#define IIO_EVENT_CODE_AD7414_T_LOW IIO_BUFFER_EVENT_CODE(1)
+
+static void ad7414_interrupt_bh(struct work_struct *work_s)
+{
+ struct ad7414_chip_info *chip =
+ container_of(work_s, struct ad7414_chip_info, thresh_work);
+ u16 status;
+ u8 config;
+ int ret;
+
+ /* retrive ALART status */
+ ret = ad7414_i2c_read(chip, AD7414_TEMPERATURE, (u8 *)&status);
+ if (ret)
+ return;
+ status = swab16(status);
+
+ /* clear ALART pin in chip configuration register */
+ ret = ad7414_i2c_read(chip, AD7414_CONFIG, &config);
+ if (ret)
+ return;
+ ret = ad7414_i2c_write(chip, AD7414_CONFIG,
+ config | AD7414_ALERT_RESET);
+ if (ret)
+ return;
+
+ enable_irq(chip->client->irq);
+
+ if (status & AD7414_T_HIGH_FLAG)
+ iio_push_event(chip->indio_dev, 0,
+ IIO_EVENT_CODE_AD7414_T_HIGH,
+ chip->last_timestamp);
+ else if (status & AD7414_T_LOW_FLAG)
+ iio_push_event(chip->indio_dev, 0,
+ IIO_EVENT_CODE_AD7414_T_LOW,
+ chip->last_timestamp);
+}
+
+static int ad7414_interrupt(struct iio_dev *dev_info,
+ int index,
+ s64 timestamp,
+ int no_test)
+{
+ struct ad7414_chip_info *chip = dev_info->dev_data;
+
+ chip->last_timestamp = timestamp;
+ schedule_work(&chip->thresh_work);
+
+ return 0;
+}
+
+IIO_EVENT_SH(ad7414, &ad7414_interrupt);
+
+static ssize_t ad7414_show_enabled(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad7414_chip_info *chip = dev_info->dev_data;
+ u8 config;
+ int ret;
+
+ /* retrive ALART status */
+ ret = ad7414_i2c_read(chip, AD7414_CONFIG, &config);
+ if (ret)
+ return -EIO;
+
+ return sprintf(buf, "%d\n", !!(config & AD7414_ALERT_EN));
+}
+
+static ssize_t ad7414_set_enabled(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad7414_chip_info *chip = dev_info->dev_data;
+ unsigned long data;
+ u8 config;
+ int ret;
+
+ ret = strict_strtoul(buf, 10, &data);
+ if (ret)
+ return -EINVAL;
+
+ /* retrive ALART status */
+ ret = ad7414_i2c_read(chip, AD7414_CONFIG, &config);
+ if (ret)
+ return -EIO;
+
+ if (data)
+ ret = ad7414_i2c_write(chip, AD7414_CONFIG,
+ config & ~AD7414_ALERT_EN);
+ else
+ ret = ad7414_i2c_write(chip, AD7414_CONFIG,
+ config | AD7414_ALERT_EN);
+ if (ret)
+ return -EIO;
+
+ return ret;
+}
+
+static inline ssize_t ad7414_show_temperature_bound(struct device *dev,
+ struct device_attribute *attr,
+ u8 bound_reg,
+ char *buf)
+{
+ struct iio_dev *dev_info = dev_get_drvdata(dev);
+ struct ad7414_chip_info *chip = dev_info->dev_data;
+ s8 data;
+ int ret;
+
+ ret = ad7414_i2c_read(chip, bound_reg, &data);
+ if (ret)
+ return -EIO;
+
+ if (data & AD7414_T_SIGN)
+ data = (data&(~AD7414_T_SIGN)) - AD7414_T_SIGN;
+
+ return sprintf(buf, "%d\n", data);
+}
+
+static inline ssize_t ad7414_set_temperature_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 ad7414_chip_info *chip = dev_info->dev_data;
+ long data;
+ s8 value;
+ int ret;
+
+ ret = strict_strtol(buf, 10, &data);
+
+ if (ret || data > 127 || data < -128)
+ return -EINVAL;
+
+ value = (s8)data;
+ if (value < 0)
+ value = (AD7414_T_SIGN + value) | AD7414_T_SIGN;
+
+ ret = ad7414_i2c_write(chip, bound_reg, value);
+ if (ret)
+ return -EIO;
+
+ return ret;
+}
+
+static ssize_t ad7414_show_temperature_high(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return ad7414_show_temperature_bound(dev, attr,
+ AD7414_TEMPERATURE_HIGH, buf);
+}
+
+static inline ssize_t ad7414_set_temperature_high(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ return ad7414_set_temperature_bound(dev, attr,
+ AD7414_TEMPERATURE_HIGH, buf, len);
+}
+
+static ssize_t ad7414_show_temperature_low(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return ad7414_show_temperature_bound(dev, attr,
+ AD7414_TEMPERATURE_LOW, buf);
+}
+
+static inline ssize_t ad7414_set_temperature_low(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t len)
+{
+ return ad7414_set_temperature_bound(dev, attr,
+ AD7414_TEMPERATURE_LOW, buf, len);
+}
+
+IIO_EVENT_ATTR_SH(t_bound_enabled, iio_event_ad7414,
+ ad7414_show_enabled, ad7414_set_enabled, 0);
+IIO_EVENT_ATTR_SH(temperature_high, iio_event_ad7414,
+ ad7414_show_temperature_high, ad7414_set_temperature_high, 0);
+IIO_EVENT_ATTR_SH(temperature_low, iio_event_ad7414,
+ ad7414_show_temperature_low, ad7414_set_temperature_low, 0);
+
+static struct attribute *ad7414_event_attributes[] = {
+ &iio_event_attr_t_bound_enabled.dev_attr.attr,
+ &iio_event_attr_temperature_high.dev_attr.attr,
+ &iio_event_attr_temperature_low.dev_attr.attr,
+ NULL,
+};
+
+static struct attribute_group ad7414_event_attribute_group = {
+ .attrs = ad7414_event_attributes,
+};
+
+/*
+ * device probe and remove
+ */
+
+static int __devinit ad7414_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct ad7414_chip_info *chip;
+ int ret = 0;
+ u8 config;
+
+ chip = kzalloc(sizeof(struct ad7414_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 = &ad7414_attribute_group;
+ if (strcmp(id->name, "ad7414") == 0)
+ chip->indio_dev->event_attrs = &ad7414_event_attribute_group;
+ else
+ client->irq = 0;
+ 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_ad7414.
+ * All event attributes bind to the same event handler.
+ * So, only register event handler once.
+ */
+ iio_add_event_to_list(&iio_event_ad7414,
+ &chip->indio_dev->interrupts[0]->ev_list);
+
+ INIT_WORK(&chip->thresh_work, ad7414_interrupt_bh);
+
+ ret = ad7414_i2c_read(chip, AD7414_CONFIG, &config);
+ if (ret) {
+ ret = -EIO;
+ goto error_unreg_irq;
+ }
+
+ if (client->irq_flags & IRQF_TRIGGER_HIGH)
+ ret = ad7414_i2c_write(chip, AD7414_CONFIG,
+ config | AD7414_ALERT_POLARITY);
+ else
+ ret = ad7414_i2c_write(chip, AD7414_CONFIG,
+ config & ~AD7414_ALERT_POLARITY);
+ 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 ad7414_remove(struct i2c_client *client)
+{
+ struct ad7414_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 ad7414_id[] = {
+ { "ad7414", 0 },
+ { "ad7415", 0 },
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, ad7414_id);
+
+static struct i2c_driver ad7414_driver = {
+ .driver = {
+ .name = "ad7414",
+ },
+ .probe = ad7414_probe,
+ .remove = __devexit_p(ad7414_remove),
+ .id_table = ad7414_id,
+};
+
+static __init int ad7414_init(void)
+{
+ return i2c_add_driver(&ad7414_driver);
+}
+
+static __exit void ad7414_exit(void)
+{
+ i2c_del_driver(&ad7414_driver);
+}
+
+MODULE_AUTHOR("Sonic Zhang <sonic.zhang@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Analog Devices AD7414 and AD7415 digital"
+ " temperature sensor driver");
+MODULE_LICENSE("GPL v2");
+
+module_init(ad7414_init);
+module_exit(ad7414_exit);
--
1.7.3.2
--
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