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/ad7416.c | 777 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 785 insertions(+), 0 deletions(-) create mode 100644 drivers/staging/iio/adc/ad7416.c diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig index 07fd1a7..59d6fb6 100644 --- a/drivers/staging/iio/adc/Kconfig +++ b/drivers/staging/iio/adc/Kconfig @@ -68,3 +68,10 @@ config AD7414 help Say yes here to build support for Analog Devices AD7414 and AD7415 temperature sensors. + +config AD7416 + tristate "Analog Devices AD7416/7/8 temperature sensor and ADC driver" + depends on I2C + help + Say yes here to build support for Analog Devices AD74167/8 + temperature sensors and ADC. diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile index c1ab11f..e95c8d4 100644 --- a/drivers/staging/iio/adc/Makefile +++ b/drivers/staging/iio/adc/Makefile @@ -12,3 +12,4 @@ obj-$(CONFIG_AD7291) += ad7291.o obj-$(CONFIG_AD7298) += ad7298.o obj-$(CONFIG_AD7314) += ad7314.o obj-$(CONFIG_AD7414) += ad7414.o +obj-$(CONFIG_AD7416) += ad7416.o diff --git a/drivers/staging/iio/adc/ad7416.c b/drivers/staging/iio/adc/ad7416.c new file mode 100644 index 0000000..b89fc86 --- /dev/null +++ b/drivers/staging/iio/adc/ad7416.c @@ -0,0 +1,777 @@ +/* + * AD7416 digital temperature sensor driver supporting AD7416/7/8 + * + * 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" + +/* + * AD7416 registers definition + */ +#define AD7416_TEMPERATURE 0 +#define AD7416_CONFIG 1 +#define AD7416_T_OTI 2 +#define AD7416_T_HYST 3 +#define AD7416_ADC_VALUE 4 +#define AD7416_CONFIG2 5 + +/* + * AD7416 config + */ +#define AD7416_PD 0x1 +#define AD7416_OTI_INT 0x2 +#define AD7416_OTI_POLARITY 0x4 +#define AD7416_FAULT_QUEUE_MASK 0x18 +#define AD7416_FAULT_QUEUE_OFFSET 3 +#define AD7416_CS_MASK 0xE0 +#define AD7416_CS_OFFSET 5 + +/* + * AD7416 config + */ +#define AD7416_CONVERT 0x80 + +/* + * AD7416 mode + */ +#define AD7416_MODE_FULL 0 +#define AD7416_MODE_SHUTDOWN 1 +#define AD7416_MODE_CONVERT 2 + +/* + * AD7416/7/8 channel maks + */ +#define AD7416_CHANNEL_MASK 0x1 +#define AD7417_CHANNEL_MASK 0x1F +#define AD7418_CHANNEL_MASK 0x11 + +/* + * AD7416 masks + */ +#define AD7416_VALUE_SIGN 0x200 +#define AD7416_VALUE_OFFSET 6 +#define AD7416_BOUND_VALUE_SIGN 0x100 + + +/* + * struct ad7416_chip_info - chip specifc information + */ + +struct ad7416_chip_info { + const char *name; + struct i2c_client *client; + struct iio_dev *indio_dev; + struct work_struct thresh_work; + s64 last_timestamp; + u16 convert_pin; + u8 mode; + u8 channel_id; /* 0 always be temperature */ + u8 channel_mask; +}; + +/* + * ad7416 register access by I2C + */ + +static int ad7416_i2c_read(struct ad7416_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 == AD7416_CONFIG || reg == AD7416_CONFIG2) + 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 ad7416_i2c_write(struct ad7416_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 ad7416_show_mode(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7416_chip_info *chip = dev_info->dev_data; + + switch (chip->mode) { + case AD7416_MODE_SHUTDOWN: + return sprintf(buf, "power-save\n"); + case AD7416_MODE_CONVERT: + return sprintf(buf, "convert\n"); + default: + return sprintf(buf, "full\n"); + } +} + +static ssize_t ad7416_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 ad7416_chip_info *chip = dev_info->dev_data; + u8 config, config2; + int ret; + + ret = ad7416_i2c_read(chip, AD7416_CONFIG, &config); + if (ret) + return -EIO; + + ret = ad7416_i2c_read(chip, AD7416_CONFIG2, &config2); + if (ret) + return -EIO; + + if (strcmp(buf, "full")) { + config2 &= ~AD7416_CONVERT; + config &= ~AD7416_PD; + + ret = ad7416_i2c_write(chip, AD7416_CONFIG, config); + if (ret) + return -EIO; + + if (chip->mode == AD7416_MODE_CONVERT) { + ret = ad7416_i2c_write(chip, AD7416_CONFIG2, config2); + if (ret) + return -EIO; + } + + chip->mode = AD7416_MODE_FULL; + } else if (chip->convert_pin && strcmp(buf, "convert")) { + config2 |= AD7416_CONVERT; + + ret = ad7416_i2c_write(chip, AD7416_CONFIG2, config2); + if (ret) + return -EIO; + + chip->mode = AD7416_MODE_CONVERT; + } else { + config |= AD7416_PD; + config2 &= ~AD7416_CONVERT; + + ret = ad7416_i2c_write(chip, AD7416_CONFIG, config); + if (ret) + return -EIO; + + if (chip->mode == AD7416_MODE_CONVERT) { + ret = ad7416_i2c_write(chip, AD7416_CONFIG2, config2); + if (ret) + return -EIO; + } + + chip->mode = AD7416_MODE_SHUTDOWN; + } + + return ret; +} + +static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, + ad7416_show_mode, + ad7416_store_mode, + 0); + +static ssize_t ad7416_show_available_modes(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7416_chip_info *chip = dev_info->dev_data; + + if (chip->convert_pin) + return sprintf(buf, "full\npower-save\nconvert\n"); + else + return sprintf(buf, "full\npower-save\n"); +} + +static IIO_DEVICE_ATTR(available_modes, S_IRUGO, ad7416_show_available_modes, NULL, 0); + +static ssize_t ad7416_show_channel(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7416_chip_info *chip = dev_info->dev_data; + + return sprintf(buf, "%d\n", chip->channel_id); +} + +static ssize_t ad7416_store_channel(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7416_chip_info *chip = dev_info->dev_data; + unsigned long data; + u8 channel_mask; + u8 config; + int ret; + + ret = strict_strtoul(buf, 10, &data); + if (ret) + return -EINVAL; + + channel_mask = 1 << data; + if (!(channel_mask & chip->channel_mask)) { + dev_err(&chip->client->dev, "Invalid channel id %lu.\n", data); + dev_err(&chip->client->dev, "Available channel mask 0x%x.\n", + chip->channel_mask); + return -EINVAL; + } else if (data == chip->channel_id) + return ret; + + ret = ad7416_i2c_read(chip, AD7416_CONFIG, &config); + if (ret) + return -EIO; + + config |= ((data << AD7416_CS_OFFSET) && AD7416_CS_MASK); + ret = ad7416_i2c_write(chip, AD7416_CONFIG, config); + if (ret) + return -EIO; + + return ret; +} + +static IIO_DEVICE_ATTR(channel, S_IRUGO | S_IWUSR, + ad7416_show_channel, + ad7416_store_channel, + 0); + + +static ssize_t ad7416_show_value(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7416_chip_info *chip = dev_info->dev_data; + u16 data; + char sign = ' '; + int ret; + + if (chip->mode == AD7416_MODE_SHUTDOWN) { + /* write to active converter */ + ret = i2c_smbus_write_byte(chip->client, AD7416_TEMPERATURE); + if (ret) + return -EIO; + } else if (chip->mode == AD7416_MODE_CONVERT) { + gpio_set_value(chip->convert_pin, 1); + gpio_set_value(chip->convert_pin, 0); + } + + if (chip->channel_id == 0) { + ret = ad7416_i2c_read(chip, AD7416_TEMPERATURE, (u8 *)&data); + if (ret) + return -EIO; + + data = swab16(data); + data >>= AD7416_VALUE_OFFSET; + if (data & AD7416_VALUE_SIGN) { + data = (AD7416_VALUE_SIGN << 1) - data; + sign = '-'; + } + + return sprintf(buf, "%c%d.%.2d\n", sign, (data >> 2), + (data & 3) * 25); + } else { + ret = ad7416_i2c_read(chip, AD7416_ADC_VALUE, (u8 *)&data); + if (ret) + return -EIO; + + data = swab16(data); + data >>= AD7416_VALUE_OFFSET; + + return sprintf(buf, "%u\n", data); + } +} + +static IIO_DEVICE_ATTR(value, S_IRUGO, ad7416_show_value, NULL, 0); + +static ssize_t ad7416_show_name(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7416_chip_info *chip = dev_info->dev_data; + return sprintf(buf, "%s\n", chip->name); +} + +static IIO_DEVICE_ATTR(name, S_IRUGO, ad7416_show_name, NULL, 0); + +static struct attribute *ad7416_attributes[] = { + &iio_dev_attr_available_modes.dev_attr.attr, + &iio_dev_attr_mode.dev_attr.attr, + &iio_dev_attr_channel.dev_attr.attr, + &iio_dev_attr_value.dev_attr.attr, + &iio_dev_attr_name.dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad7416_attribute_group = { + .attrs = ad7416_attributes, +}; + +/* + * temperature bound events + */ + +#define IIO_EVENT_CODE_AD7416_OTI (IIO_EVENT_CODE_DEVICE_SPECIFIC + 1) + +static void ad7416_interrupt_bh(struct work_struct *work_s) +{ + struct ad7416_chip_info *chip = + container_of(work_s, struct ad7416_chip_info, thresh_work); + + enable_irq(chip->client->irq); + + iio_push_event(chip->indio_dev, 0, + IIO_EVENT_CODE_AD7416_OTI, + chip->last_timestamp); +} + +static int ad7416_interrupt(struct iio_dev *dev_info, + int index, + s64 timestamp, + int no_test) +{ + struct ad7416_chip_info *chip = dev_info->dev_data; + + chip->last_timestamp = timestamp; + schedule_work(&chip->thresh_work); + + return 0; +} + +IIO_EVENT_SH(ad7416, &ad7416_interrupt); + +static ssize_t ad7416_show_oti_mode(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7416_chip_info *chip = dev_info->dev_data; + u8 config; + int ret; + + /* retrive ALART status */ + ret = ad7416_i2c_read(chip, AD7416_CONFIG, &config); + if (ret) + return -EIO; + + if (config & AD7416_OTI_INT) + return sprintf(buf, "interrupt\n"); + else + return sprintf(buf, "comparator\n"); +} + +static ssize_t ad7416_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 ad7416_chip_info *chip = dev_info->dev_data; + u8 config; + int ret; + + /* retrive ALART status */ + ret = ad7416_i2c_read(chip, AD7416_CONFIG, &config); + if (ret) + return -EIO; + + if (strcmp(buf, "comparator") == 0) + ret = ad7416_i2c_write(chip, AD7416_CONFIG, + config & ~AD7416_OTI_INT); + else + ret = ad7416_i2c_write(chip, AD7416_CONFIG, + config | AD7416_OTI_INT); + if (ret) + return -EIO; + + return ret; +} + +static ssize_t ad7416_show_available_oti_modes(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "comparator\ninterrupt\n"); +} + +static ssize_t ad7416_show_fault_queue(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *dev_info = dev_get_drvdata(dev); + struct ad7416_chip_info *chip = dev_info->dev_data; + u8 config; + int ret; + + /* retrive ALART status */ + ret = ad7416_i2c_read(chip, AD7416_CONFIG, &config); + if (ret) + return -EIO; + + return sprintf(buf, "%d\n", (config & AD7416_FAULT_QUEUE_MASK) >> + AD7416_FAULT_QUEUE_OFFSET); +} + +static ssize_t ad7416_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 ad7416_chip_info *chip = dev_info->dev_data; + unsigned long data; + u8 config; + int ret; + + ret = strict_strtoul(buf, 10, &data); + if (ret || data > 3) + return -EINVAL; + + /* retrive ALART status */ + ret = ad7416_i2c_read(chip, AD7416_CONFIG, &config); + if (ret) + return -EIO; + + config &= ~AD7416_FAULT_QUEUE_MASK; + config |= (data << AD7416_FAULT_QUEUE_OFFSET); + ret = ad7416_i2c_write(chip, AD7416_CONFIG, config); + if (ret) + return -EIO; + + return ret; +} +static inline ssize_t ad7416_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 ad7416_chip_info *chip = dev_info->dev_data; + u16 data; + s16 value; + int ret; + + ret = ad7416_i2c_read(chip, bound_reg, (u8 *)&data); + if (ret) + return -EIO; + + data = swab16(data); + data >>= (AD7416_VALUE_OFFSET + 1); + + if (chip->channel_id == 0) { + if (data & AD7416_BOUND_VALUE_SIGN) { + value = (s16)(data&(~AD7416_BOUND_VALUE_SIGN)); + value = value - AD7416_BOUND_VALUE_SIGN; + } else + value = (s16)data; + + return sprintf(buf, "%d\n", value >> 1); + } else + return sprintf(buf, "%u\n", data); +} + +static inline ssize_t ad7416_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 ad7416_chip_info *chip = dev_info->dev_data; + long value; + u16 data; + int ret; + + if (chip->channel_id == 0) { + ret = strict_strtol(buf, 10, &value); + + if (ret || value < -128 || value > 127) + return -EINVAL; + if (value < 0) + value = (AD7416_BOUND_VALUE_SIGN + value) | + AD7416_BOUND_VALUE_SIGN; + + data = (u16)value << 1; + } else { + ret = strict_strtoul(buf, 10, &value); + + if (ret || value > 511 || value < 0) + return -EINVAL; + + data = (u16)value; + } + + data <<= (AD7416_VALUE_OFFSET + 1); + data = swab16(data); + ret = ad7416_i2c_write(chip, bound_reg, (u8)data); + if (ret) + return -EIO; + + return ret; +} + +static ssize_t ad7416_show_t_oti(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return ad7416_show_t_bound(dev, attr, + AD7416_T_OTI, buf); +} + +static inline ssize_t ad7416_set_t_oti(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + return ad7416_set_t_bound(dev, attr, + AD7416_T_OTI, buf, len); +} + +static ssize_t ad7416_show_t_hyst(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return ad7416_show_t_bound(dev, attr, + AD7416_T_HYST, buf); +} + +static inline ssize_t ad7416_set_t_hyst(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + return ad7416_set_t_bound(dev, attr, + AD7416_T_HYST, buf, len); +} + +IIO_EVENT_ATTR_SH(oti_mode, iio_event_ad7416, + ad7416_show_oti_mode, ad7416_set_oti_mode, 0); +IIO_EVENT_ATTR_SH(available_oti_modes, iio_event_ad7416, + ad7416_show_available_oti_modes, NULL, 0); +IIO_EVENT_ATTR_SH(fault_queue, iio_event_ad7416, + ad7416_show_fault_queue, ad7416_set_fault_queue, 0); +IIO_EVENT_ATTR_SH(t_oti, iio_event_ad7416, + ad7416_show_t_oti, ad7416_set_t_oti, 0); +IIO_EVENT_ATTR_SH(t_hyst, iio_event_ad7416, + ad7416_show_t_hyst, ad7416_set_t_hyst, 0); + +static struct attribute *ad7416_event_attributes[] = { + &iio_event_attr_oti_mode.dev_attr.attr, + &iio_event_attr_available_oti_modes.dev_attr.attr, + &iio_event_attr_fault_queue.dev_attr.attr, + &iio_event_attr_t_oti.dev_attr.attr, + &iio_event_attr_t_hyst.dev_attr.attr, + NULL, +}; + +static struct attribute_group ad7416_event_attribute_group = { + .attrs = ad7416_event_attributes, +}; + +/* + * device probe and remove + */ + +static int __devinit ad7416_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct ad7416_chip_info *chip; + unsigned long convert_pin = (unsigned long)client->dev.platform_data; + int ret = 0; + u8 config; + + chip = kzalloc(sizeof(struct ad7416_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; + if (strcmp(chip->name, "ad7418") == 0) { + chip->channel_mask = AD7418_CHANNEL_MASK; + if (convert_pin) { + ret = gpio_request(convert_pin, chip->name); + if (!ret) { + chip->convert_pin = (u16)convert_pin; + gpio_set_value(chip->convert_pin, 0); + } + } + } else if (strcmp(chip->name, "ad7417") == 0) { + chip->channel_mask = AD7417_CHANNEL_MASK; + if (convert_pin) { + ret = gpio_request(convert_pin, chip->name); + if (!ret) { + chip->convert_pin = (u16)convert_pin; + gpio_set_value(chip->convert_pin, 0); + } + } + } else + chip->channel_mask = AD7416_CHANNEL_MASK; + + 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 = &ad7416_attribute_group; + chip->indio_dev->event_attrs = &ad7416_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_ad7416. + * All event attributes bind to the same event handler. + * So, only register event handler once. + */ + iio_add_event_to_list(&iio_event_ad7416, + &chip->indio_dev->interrupts[0]->ev_list); + + INIT_WORK(&chip->thresh_work, ad7416_interrupt_bh); + + ret = ad7416_i2c_read(chip, AD7416_CONFIG, &config); + if (ret) { + ret = -EIO; + goto error_unreg_irq; + } + + if (client->irq_flags & IRQF_TRIGGER_HIGH) + ret = ad7416_i2c_write(chip, AD7416_CONFIG, + config | AD7416_OTI_POLARITY); + else + ret = ad7416_i2c_write(chip, AD7416_CONFIG, + config & ~AD7416_OTI_POLARITY); + if (ret) { + ret = -EIO; + goto error_unreg_irq; + } + } + + dev_info(&client->dev, "%s temperature sensor and ADC 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 ad7416_remove(struct i2c_client *client) +{ + struct ad7416_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); + if (chip->convert_pin) + gpio_free(chip->convert_pin); + kfree(chip); + + return 0; +} + +static const struct i2c_device_id ad7416_id[] = { + { "ad7416", 0 }, + { "ad7417", 0 }, + { "ad7418", 0 }, + {} +}; + +MODULE_DEVICE_TABLE(i2c, ad7416_id); + +static struct i2c_driver ad7416_driver = { + .driver = { + .name = "ad7416", + }, + .probe = ad7416_probe, + .remove = __devexit_p(ad7416_remove), + .id_table = ad7416_id, +}; + +static __init int ad7416_init(void) +{ + return i2c_add_driver(&ad7416_driver); +} + +static __exit void ad7416_exit(void) +{ + i2c_del_driver(&ad7416_driver); +} + +MODULE_AUTHOR("Sonic Zhang <sonic.zhang@xxxxxxxxxx>"); +MODULE_DESCRIPTION("Analog Devices AD7416/7/8 digital" + " temperature sensor driver"); +MODULE_LICENSE("GPL v2"); + +module_init(ad7416_init); +module_exit(ad7416_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