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 6d3b8bc..07fd1a7 100644 --- a/drivers/staging/iio/adc/Kconfig +++ b/drivers/staging/iio/adc/Kconfig @@ -61,3 +61,10 @@ config AD7314 help 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. diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile index 04fd93b..c1ab11f 100644 --- a/drivers/staging/iio/adc/Makefile +++ b/drivers/staging/iio/adc/Makefile @@ -11,3 +11,4 @@ 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..b92c880 --- /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_EVENT_CODE_DEVICE_SPECIFIC + 1) +#define IIO_EVENT_CODE_AD7414_T_LOW (IIO_EVENT_CODE_DEVICE_SPECIFIC + 2) + +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 -- 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