diff options
| -rw-r--r-- | drivers/staging/iio/adc/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/Makefile | 2 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7745.c | 673 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7746.c | 804 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7746.h | 29 |
5 files changed, 835 insertions, 675 deletions
diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig index 7867ab18913e..0482073744f3 100644 --- a/drivers/staging/iio/adc/Kconfig +++ b/drivers/staging/iio/adc/Kconfig @@ -144,7 +144,7 @@ config AD7793 To compile this driver as a module, choose M here: the module will be called AD7793. -config AD7745 +config AD7746 tristate "Analog Devices AD7745, AD7746 AD7747 capacitive sensor driver" depends on I2C help diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile index 990d3fada305..5ba3cdb631c8 100644 --- a/drivers/staging/iio/adc/Makefile +++ b/drivers/staging/iio/adc/Makefile @@ -33,7 +33,7 @@ obj-$(CONFIG_AD7150) += ad7150.o obj-$(CONFIG_AD7152) += ad7152.o obj-$(CONFIG_AD7291) += ad7291.o obj-$(CONFIG_AD7314) += ad7314.o -obj-$(CONFIG_AD7745) += ad7745.o +obj-$(CONFIG_AD7746) += ad7746.o obj-$(CONFIG_AD7780) += ad7780.o obj-$(CONFIG_AD7793) += ad7793.o obj-$(CONFIG_AD7816) += ad7816.o diff --git a/drivers/staging/iio/adc/ad7745.c b/drivers/staging/iio/adc/ad7745.c deleted file mode 100644 index 827344c21475..000000000000 --- a/drivers/staging/iio/adc/ad7745.c +++ /dev/null @@ -1,673 +0,0 @@ -/* - * AD774X capacitive sensor driver supporting AD7745/6/7 - * - * Copyright 2010 Analog Devices Inc. - * - * Licensed under the GPL-2 or later. - */ - -#include <linux/interrupt.h> -#include <linux/gpio.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/module.h> - -#include "../iio.h" -#include "../sysfs.h" - -/* - * AD774X registers definition - */ - -#define AD774X_STATUS 0 -#define AD774X_STATUS_RDY (1 << 2) -#define AD774X_STATUS_RDYVT (1 << 1) -#define AD774X_STATUS_RDYCAP (1 << 0) -#define AD774X_CAP_DATA_HIGH 1 -#define AD774X_CAP_DATA_MID 2 -#define AD774X_CAP_DATA_LOW 3 -#define AD774X_VT_DATA_HIGH 4 -#define AD774X_VT_DATA_MID 5 -#define AD774X_VT_DATA_LOW 6 -#define AD774X_CAP_SETUP 7 -#define AD774X_VT_SETUP 8 -#define AD774X_EXEC_SETUP 9 -#define AD774X_CFG 10 -#define AD774X_CAPDACA 11 -#define AD774X_CAPDACB 12 -#define AD774X_CAPDAC_EN (1 << 7) -#define AD774X_CAP_OFFH 13 -#define AD774X_CAP_OFFL 14 -#define AD774X_CAP_GAINH 15 -#define AD774X_CAP_GAINL 16 -#define AD774X_VOLT_GAINH 17 -#define AD774X_VOLT_GAINL 18 - -#define AD774X_MAX_CONV_MODE 6 - -/* - * struct ad774x_chip_info - chip specifc information - */ - -struct ad774x_chip_info { - struct i2c_client *client; - bool inter; - u16 cap_offs; /* Capacitive offset */ - u16 cap_gain; /* Capacitive gain calibration */ - u16 volt_gain; /* Voltage gain calibration */ - u8 cap_setup; - u8 vt_setup; - u8 exec_setup; - - char *conversion_mode; -}; - -struct ad774x_conversion_mode { - char *name; - u8 reg_cfg; -}; - -static struct ad774x_conversion_mode -ad774x_conv_mode_table[AD774X_MAX_CONV_MODE] = { - { "idle", 0 }, - { "continuous-conversion", 1 }, - { "single-conversion", 2 }, - { "power-down", 3 }, - { "offset-calibration", 5 }, - { "gain-calibration", 6 }, -}; - -/* - * ad774x register access by I2C - */ - -static int ad774x_i2c_read(struct ad774x_chip_info *chip, u8 reg, u8 *data, int len) -{ - struct i2c_client *client = chip->client; - int ret; - - ret = i2c_master_send(client, ®, 1); - if (ret < 0) { - dev_err(&client->dev, "I2C write error\n"); - return ret; - } - - ret = i2c_master_recv(client, data, len); - if (ret < 0) { - dev_err(&client->dev, "I2C read error\n"); - return ret; - } - - return ret; -} - -static int ad774x_i2c_write(struct ad774x_chip_info *chip, u8 reg, u8 data) -{ - struct i2c_client *client = chip->client; - int ret; - - u8 tx[2] = { - reg, - data, - }; - - ret = i2c_master_send(client, tx, 2); - if (ret < 0) - dev_err(&client->dev, "I2C write error\n"); - - return ret; -} - -/* - * sysfs nodes - */ - -#define IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(_show) \ - IIO_DEVICE_ATTR(available_conversion_modes, S_IRUGO, _show, NULL, 0) -#define IIO_DEV_ATTR_CONVERSION_MODE(_mode, _show, _store) \ - IIO_DEVICE_ATTR(conversion_mode, _mode, _show, _store, 0) -#define IIO_DEV_ATTR_CAP_SETUP(_mode, _show, _store) \ - IIO_DEVICE_ATTR(in_capacitance_setup, _mode, _show, _store, 0) -#define IIO_DEV_ATTR_VT_SETUP(_mode, _show, _store) \ - IIO_DEVICE_ATTR(in_voltage0_setup, _mode, _show, _store, 0) -#define IIO_DEV_ATTR_EXEC_SETUP(_mode, _show, _store) \ - IIO_DEVICE_ATTR(exec_setup, _mode, _show, _store, 0) -#define IIO_DEV_ATTR_VOLT_GAIN(_mode, _show, _store) \ - IIO_DEVICE_ATTR(in_voltage0_gain, _mode, _show, _store, 0) -#define IIO_DEV_ATTR_CAP_OFFS(_mode, _show, _store) \ - IIO_DEVICE_ATTR(in_capacitance_offs, _mode, _show, _store, 0) -#define IIO_DEV_ATTR_CAP_GAIN(_mode, _show, _store) \ - IIO_DEVICE_ATTR(in_capacitance_gain, _mode, _show, _store, 0) -#define IIO_DEV_ATTR_CAP_DATA(_show) \ - IIO_DEVICE_ATTR(in_capacitance0_raw, S_IRUGO, _show, NULL, 0) -#define IIO_DEV_ATTR_VT_DATA(_show) \ - IIO_DEVICE_ATTR(in_voltage0_raw, S_IRUGO, _show, NULL, 0) - -static ssize_t ad774x_show_conversion_modes(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - int i; - int len = 0; - - for (i = 0; i < AD774X_MAX_CONV_MODE; i++) - len += sprintf(buf + len, "%s ", ad774x_conv_mode_table[i].name); - - len += sprintf(buf + len, "\n"); - - return len; -} - -static IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(ad774x_show_conversion_modes); - -static ssize_t ad774x_show_conversion_mode(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - - return sprintf(buf, "%s\n", chip->conversion_mode); -} - -static ssize_t ad774x_store_conversion_mode(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - u8 cfg; - int i; - - ad774x_i2c_read(chip, AD774X_CFG, &cfg, 1); - - for (i = 0; i < AD774X_MAX_CONV_MODE; i++) { - if (strncmp(buf, ad774x_conv_mode_table[i].name, - strlen(ad774x_conv_mode_table[i].name) - 1) == 0) { - chip->conversion_mode = ad774x_conv_mode_table[i].name; - cfg |= 0x18 | ad774x_conv_mode_table[i].reg_cfg; - ad774x_i2c_write(chip, AD774X_CFG, cfg); - return len; - } - } - - dev_err(dev, "not supported conversion mode\n"); - - return -EINVAL; -} - -static IIO_DEV_ATTR_CONVERSION_MODE(S_IRUGO | S_IWUSR, - ad774x_show_conversion_mode, - ad774x_store_conversion_mode); - -static ssize_t ad774x_show_dac_value(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); - u8 data; - - ad774x_i2c_read(chip, this_attr->address, &data, 1); - - return sprintf(buf, "%02x\n", data & 0x7F); -} - -static ssize_t ad774x_store_dac_value(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); - unsigned long data; - int ret; - - ret = strict_strtoul(buf, 10, &data); - - if (!ret) { - ad774x_i2c_write(chip, this_attr->address, - (data ? AD774X_CAPDAC_EN : 0) | (data & 0x7F)); - return len; - } - - return -EINVAL; -} - -static IIO_DEVICE_ATTR(out_capacitance0_raw, S_IRUGO | S_IWUSR, - ad774x_show_dac_value, - ad774x_store_dac_value, - AD774X_CAPDACA); - -static IIO_DEVICE_ATTR(out_capacitance1_raw, S_IRUGO | S_IWUSR, - ad774x_show_dac_value, - ad774x_store_dac_value, - AD774X_CAPDACB); - -static ssize_t ad774x_show_cap_setup(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - - return sprintf(buf, "0x%02x\n", chip->cap_setup); -} - -static ssize_t ad774x_store_cap_setup(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - int ret; - - ret = strict_strtoul(buf, 10, &data); - - if ((!ret) && (data < 0x100)) { - ad774x_i2c_write(chip, AD774X_CAP_SETUP, data); - chip->cap_setup = data; - return len; - } - - return -EINVAL; -} - -static IIO_DEV_ATTR_CAP_SETUP(S_IRUGO | S_IWUSR, - ad774x_show_cap_setup, - ad774x_store_cap_setup); - -static ssize_t ad774x_show_vt_setup(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - - return sprintf(buf, "0x%02x\n", chip->vt_setup); -} - -static ssize_t ad774x_store_vt_setup(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - int ret; - - ret = strict_strtoul(buf, 10, &data); - - if ((!ret) && (data < 0x100)) { - ad774x_i2c_write(chip, AD774X_VT_SETUP, data); - chip->vt_setup = data; - return len; - } - - return -EINVAL; -} - -static IIO_DEV_ATTR_VT_SETUP(S_IRUGO | S_IWUSR, - ad774x_show_vt_setup, - ad774x_store_vt_setup); - -static ssize_t ad774x_show_exec_setup(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - - return sprintf(buf, "0x%02x\n", chip->exec_setup); -} - -static ssize_t ad774x_store_exec_setup(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - int ret; - - ret = strict_strtoul(buf, 10, &data); - - if ((!ret) && (data < 0x100)) { - ad774x_i2c_write(chip, AD774X_EXEC_SETUP, data); - chip->exec_setup = data; - return len; - } - - return -EINVAL; -} - -static IIO_DEV_ATTR_EXEC_SETUP(S_IRUGO | S_IWUSR, - ad774x_show_exec_setup, - ad774x_store_exec_setup); - -static ssize_t ad774x_show_volt_gain(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - - return sprintf(buf, "%d\n", chip->volt_gain); -} - -static ssize_t ad774x_store_volt_gain(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - int ret; - - ret = strict_strtoul(buf, 10, &data); - - if ((!ret) && (data < 0x10000)) { - ad774x_i2c_write(chip, AD774X_VOLT_GAINH, data >> 8); - ad774x_i2c_write(chip, AD774X_VOLT_GAINL, data); - chip->volt_gain = data; - return len; - } - - return -EINVAL; -} - -static IIO_DEV_ATTR_VOLT_GAIN(S_IRUGO | S_IWUSR, - ad774x_show_volt_gain, - ad774x_store_volt_gain); - -static ssize_t ad774x_show_cap_data(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - char tmp[3]; - - ad774x_i2c_read(chip, AD774X_CAP_DATA_HIGH, tmp, 3); - data = ((int)tmp[0] << 16) | ((int)tmp[1] << 8) | (int)tmp[2]; - - return sprintf(buf, "%ld\n", data); -} - -static IIO_DEV_ATTR_CAP_DATA(ad774x_show_cap_data); - -static ssize_t ad774x_show_vt_data(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - char tmp[3]; - - ad774x_i2c_read(chip, AD774X_VT_DATA_HIGH, tmp, 3); - data = ((int)tmp[0] << 16) | ((int)tmp[1] << 8) | (int)tmp[2]; - - return sprintf(buf, "%ld\n", data); -} - -static IIO_DEV_ATTR_VT_DATA(ad774x_show_vt_data); - -static ssize_t ad774x_show_cap_offs(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - - return sprintf(buf, "%d\n", chip->cap_offs); -} - -static ssize_t ad774x_store_cap_offs(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - int ret; - - ret = strict_strtoul(buf, 10, &data); - - if ((!ret) && (data < 0x10000)) { - ad774x_i2c_write(chip, AD774X_CAP_OFFH, data >> 8); - ad774x_i2c_write(chip, AD774X_CAP_OFFL, data); - chip->cap_offs = data; - return len; - } - - return -EINVAL; -} - -static IIO_DEV_ATTR_CAP_OFFS(S_IRUGO | S_IWUSR, - ad774x_show_cap_offs, - ad774x_store_cap_offs); - -static ssize_t ad774x_show_cap_gain(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - - return sprintf(buf, "%d\n", chip->cap_gain); -} - -static ssize_t ad774x_store_cap_gain(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *dev_info = dev_get_drvdata(dev); - struct ad774x_chip_info *chip = iio_priv(dev_info); - unsigned long data; - int ret; - - ret = strict_strtoul(buf, 10, &data); - - if ((!ret) && (data < 0x10000)) { - ad774x_i2c_write(chip, AD774X_CAP_GAINH, data >> 8); - ad774x_i2c_write(chip, AD774X_CAP_GAINL, data); - chip->cap_gain = data; - return len; - } - - return -EINVAL; -} - -static IIO_DEV_ATTR_CAP_GAIN(S_IRUGO | S_IWUSR, - ad774x_show_cap_gain, - ad774x_store_cap_gain); - -static struct attribute *ad774x_attributes[] = { - &iio_dev_attr_available_conversion_modes.dev_attr.attr, - &iio_dev_attr_conversion_mode.dev_attr.attr, - &iio_dev_attr_in_capacitance_setup.dev_attr.attr, - &iio_dev_attr_in_voltage0_setup.dev_attr.attr, - &iio_dev_attr_exec_setup.dev_attr.attr, - &iio_dev_attr_in_capacitance_offs.dev_attr.attr, - &iio_dev_attr_in_capacitance_gain.dev_attr.attr, - &iio_dev_attr_in_voltage0_gain.dev_attr.attr, - &iio_dev_attr_in_voltage0_raw.dev_attr.attr, - &iio_dev_attr_in_capacitance0_raw.dev_attr.attr, - &iio_dev_attr_out_capacitance0_raw.dev_attr.attr, - &iio_dev_attr_out_capacitance1_raw.dev_attr.attr, - NULL, -}; - -static const struct attribute_group ad774x_attribute_group = { - .attrs = ad774x_attributes, -}; - -/* - * data ready events - */ - -#define IIO_EVENT_CODE_CAP_RDY 0 -#define IIO_EVENT_CODE_VT_RDY 1 - -#define IIO_EVENT_ATTR_CAP_RDY_SH(_evlist, _show, _store, _mask) \ - IIO_EVENT_ATTR_SH(cap_rdy, _evlist, _show, _store, _mask) - -#define IIO_EVENT_ATTR_VT_RDY_SH(_evlist, _show, _store, _mask) \ - IIO_EVENT_ATTR_SH(vt_rdy, _evlist, _show, _store, _mask) - -static irqreturn_t ad774x_event_handler(int irq, void *private) -{ - struct iio_dev *indio_dev = private; - struct ad774x_chip_info *chip = iio_priv(indio_dev); - u8 int_status; - - ad774x_i2c_read(chip, AD774X_STATUS, &int_status, 1); - - if (int_status & AD774X_STATUS_RDYCAP) - iio_push_event(indio_dev, - IIO_EVENT_CODE_CAP_RDY, - iio_get_time_ns()); - - if (int_status & AD774X_STATUS_RDYVT) - iio_push_event(indio_dev, - IIO_EVENT_CODE_VT_RDY, - iio_get_time_ns()); - - return IRQ_HANDLED; -} - -static IIO_CONST_ATTR(cap_rdy_en, "1"); -static IIO_CONST_ATTR(vt_rdy_en, "1"); - -static struct attribute *ad774x_event_attributes[] = { - &iio_const_attr_cap_rdy_en.dev_attr.attr, - &iio_const_attr_vt_rdy_en.dev_attr.attr, - NULL, -}; - -static struct attribute_group ad774x_event_attribute_group = { - .attrs = ad774x_event_attributes, - .name = "events", -}; - -static const struct iio_info ad774x_info = { - .attrs = &ad774x_event_attribute_group, - .event_attrs = &ad774x_event_attribute_group, - .driver_module = THIS_MODULE, -}; -/* - * device probe and remove - */ - -static int __devinit ad774x_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - int ret; - struct ad774x_chip_info *chip; - struct iio_dev *indio_dev; - - 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; - - /* Establish that the iio_dev is a child of the i2c device */ - indio_dev->name = id->name; - indio_dev->dev.parent = &client->dev; - indio_dev->info = &ad774x_info; - indio_dev->modes = INDIO_DIRECT_MODE; - - if (client->irq) { - ret = request_threaded_irq(client->irq, - NULL, - &ad774x_event_handler, - IRQF_TRIGGER_FALLING, - "ad774x", - indio_dev); - if (ret) - goto error_free_dev; - } - - ret = iio_device_register(indio_dev); - if (ret) - goto error_free_irq; - - dev_err(&client->dev, "%s capacitive sensor registered, irq: %d\n", id->name, client->irq); - - return 0; - -error_free_irq: - free_irq(client->irq, indio_dev); -error_free_dev: - iio_free_device(indio_dev); -error_ret: - return ret; -} - -static int __devexit ad774x_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 ad774x_id[] = { - { "ad7745", 0 }, - { "ad7746", 0 }, - { "ad7747", 0 }, - {} -}; - -MODULE_DEVICE_TABLE(i2c, ad774x_id); - -static struct i2c_driver ad774x_driver = { - .driver = { - .name = "ad774x", - }, - .probe = ad774x_probe, - .remove = __devexit_p(ad774x_remove), - .id_table = ad774x_id, -}; - -static __init int ad774x_init(void) -{ - return i2c_add_driver(&ad774x_driver); -} - -static __exit void ad774x_exit(void) -{ - i2c_del_driver(&ad774x_driver); -} - -MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); -MODULE_DESCRIPTION("Analog Devices ad7745/6/7 capacitive sensor driver"); -MODULE_LICENSE("GPL v2"); - -module_init(ad774x_init); -module_exit(ad774x_exit); diff --git a/drivers/staging/iio/adc/ad7746.c b/drivers/staging/iio/adc/ad7746.c new file mode 100644 index 000000000000..0b251ad17808 --- /dev/null +++ b/drivers/staging/iio/adc/ad7746.c @@ -0,0 +1,804 @@ +/* + * AD7746 capacitive sensor driver supporting AD7745, AD7746 and AD7747 + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#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/delay.h> + +#include "../iio.h" +#include "../sysfs.h" + +#include "ad7746.h" + +/* + * AD7746 Register Definition + */ + +#define AD7746_REG_STATUS 0 +#define AD7746_REG_CAP_DATA_HIGH 1 +#define AD7746_REG_CAP_DATA_MID 2 +#define AD7746_REG_CAP_DATA_LOW 3 +#define AD7746_REG_VT_DATA_HIGH 4 +#define AD7746_REG_VT_DATA_MID 5 +#define AD7746_REG_VT_DATA_LOW 6 +#define AD7746_REG_CAP_SETUP 7 +#define AD7746_REG_VT_SETUP 8 +#define AD7746_REG_EXC_SETUP 9 +#define AD7746_REG_CFG 10 +#define AD7746_REG_CAPDACA 11 +#define AD7746_REG_CAPDACB 12 +#define AD7746_REG_CAP_OFFH 13 +#define AD7746_REG_CAP_OFFL 14 +#define AD7746_REG_CAP_GAINH 15 +#define AD7746_REG_CAP_GAINL 16 +#define AD7746_REG_VOLT_GAINH 17 +#define AD7746_REG_VOLT_GAINL 18 + +/* Status Register Bit Designations (AD7746_REG_STATUS) */ +#define AD7746_STATUS_EXCERR (1 << 3) +#define AD7746_STATUS_RDY (1 << 2) +#define AD7746_STATUS_RDYVT (1 << 1) +#define AD7746_STATUS_RDYCAP (1 << 0) + +/* Capacitive Channel Setup Register Bit Designations (AD7746_REG_CAP_SETUP) */ +#define AD7746_CAPSETUP_CAPEN (1 << 7) +#define AD7746_CAPSETUP_CIN2 (1 << 6) /* AD7746 only */ +#define AD7746_CAPSETUP_CAPDIFF (1 << 5) +#define AD7746_CAPSETUP_CACHOP (1 << 0) + +/* Voltage/Temperature Setup Register Bit Designations (AD7746_REG_VT_SETUP) */ +#define AD7746_VTSETUP_VTEN (1 << 7) +#define AD7746_VTSETUP_VTMD_INT_TEMP (0 << 5) +#define AD7746_VTSETUP_VTMD_EXT_TEMP (1 << 5) +#define AD7746_VTSETUP_VTMD_VDD_MON (2 << 5) +#define AD7746_VTSETUP_VTMD_EXT_VIN (3 << 5) +#define AD7746_VTSETUP_EXTREF (1 << 4) +#define AD7746_VTSETUP_VTSHORT (1 << 1) +#define AD7746_VTSETUP_VTCHOP (1 << 0) + +/* Excitation Setup Register Bit Designations (AD7746_REG_EXC_SETUP) */ +#define AD7746_EXCSETUP_CLKCTRL (1 << 7) +#define AD7746_EXCSETUP_EXCON (1 << 6) +#define AD7746_EXCSETUP_EXCB (1 << 5) +#define AD7746_EXCSETUP_NEXCB (1 << 4) +#define AD7746_EXCSETUP_EXCA (1 << 3) +#define AD7746_EXCSETUP_NEXCA (1 << 2) +#define AD7746_EXCSETUP_EXCLVL(x) (((x) & 0x3) << 0) + +/* Config Register Bit Designations (AD7746_REG_CFG) */ +#define AD7746_CONF_VTFS(x) ((x) << 6) +#define AD7746_CONF_CAPFS(x) ((x) << 3) +#define AD7746_CONF_MODE_IDLE (0 << 0) +#define AD7746_CONF_MODE_CONT_CONV (1 << 0) +#define AD7746_CONF_MODE_SINGLE_CONV (2 << 0) +#define AD7746_CONF_MODE_PWRDN (3 << 0) +#define AD7746_CONF_MODE_OFFS_CAL (5 << 0) +#define AD7746_CONF_MODE_GAIN_CAL (6 << 0) + +/* CAPDAC Register Bit Designations (AD7746_REG_CAPDACx) */ +#define AD7746_CAPDAC_DACEN (1 << 7) +#define AD7746_CAPDAC_DACP(x) ((x) & 0x7F) + +/* + * struct ad7746_chip_info - chip specifc information + */ + +struct ad7746_chip_info { + struct i2c_client *client; + /* + * Capacitive channel digital filter setup; + * conversion time/update rate setup per channel + */ + u8 config; + u8 cap_setup; + u8 vt_setup; + u8 capdac[2][2]; + s8 capdac_set; +}; + +enum ad7746_chan { + VIN, + VIN_VDD, + TEMP_INT, + TEMP_EXT, + CIN1, + CIN1_DIFF, + CIN2, + CIN2_DIFF, +}; + +static const struct iio_chan_spec ad7746_channels[] = { + [VIN] = { + .type = IIO_VOLTAGE, + .indexed = 1, + .channel = 0, + .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), + .address = AD7746_REG_VT_DATA_HIGH << 8 | + AD7746_VTSETUP_VTMD_EXT_VIN, + }, + [VIN_VDD] = { + .type = IIO_VOLTAGE, + .indexed = 1, + .channel = 1, + .extend_name = "supply", + .info_mask = (1 << IIO_CHAN_INFO_SCALE_SHARED), + .address = AD7746_REG_VT_DATA_HIGH << 8 | + AD7746_VTSETUP_VTMD_VDD_MON, + }, + [TEMP_INT] = { + .type = IIO_TEMP, + .indexed = 1, + .channel = 0, + .processed_val = IIO_PROCESSED, + .address = AD7746_REG_VT_DATA_HIGH << 8 | + AD7746_VTSETUP_VTMD_INT_TEMP, + }, + [TEMP_EXT] = { + .type = IIO_TEMP, + .indexed = 1, + .channel = 1, + .processed_val = IIO_PROCESSED, + .address = AD7746_REG_VT_DATA_HIGH << 8 | + AD7746_VTSETUP_VTMD_EXT_TEMP, + }, + [CIN1] = { + .type = IIO_CAPACITANCE, + .indexed = 1, + .channel = 0, + .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) | + (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) | + (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) | + (1 << IIO_CHAN_INFO_SCALE_SHARED), + .address = AD7746_REG_CAP_DATA_HIGH << 8, + }, + [CIN1_DIFF] = { + .type = IIO_CAPACITANCE, + .differential = 1, + .indexed = 1, + .channel = 0, + .channel2 = 2, + .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) | + (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) | + (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) | + (1 << IIO_CHAN_INFO_SCALE_SHARED), + .address = AD7746_REG_CAP_DATA_HIGH << 8 | + AD7746_CAPSETUP_CAPDIFF + }, + [CIN2] = { + .type = IIO_CAPACITANCE, + .indexed = 1, + .channel = 1, + .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) | + (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) | + (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) | + (1 << IIO_CHAN_INFO_SCALE_SHARED), + .address = AD7746_REG_CAP_DATA_HIGH << 8 | + AD7746_CAPSETUP_CIN2, + }, + [CIN2_DIFF] = { + .type = IIO_CAPACITANCE, + .differential = 1, + .indexed = 1, + .channel = 1, + .channel2 = 3, + .info_mask = (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE) | + (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED) | + (1 << IIO_CHAN_INFO_OFFSET_SEPARATE) | + (1 << IIO_CHAN_INFO_SCALE_SHARED), + .address = AD7746_REG_CAP_DATA_HIGH << 8 | + AD7746_CAPSETUP_CAPDIFF | AD7746_CAPSETUP_CIN2, + } +}; + +/* Values are Update Rate (Hz), Conversion Time (ms) + 1*/ +static const unsigned char ad7746_vt_filter_rate_table[][2] = { + {50, 20 + 1}, {31, 32 + 1}, {16, 62 + 1}, {8, 122 + 1}, +}; + +static const unsigned char ad7746_cap_filter_rate_table[][2] = { + {91, 11 + 1}, {84, 12 + 1}, {50, 20 + 1}, {26, 38 + 1}, + {16, 62 + 1}, {13, 77 + 1}, {11, 92 + 1}, {9, 110 + 1}, +}; + +static int ad7746_select_channel(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan) +{ + struct ad7746_chip_info *chip = iio_priv(indio_dev); + int ret, delay; + u8 vt_setup, cap_setup; + + switch (chan->type) { + case IIO_CAPACITANCE: + cap_setup = (chan->address & 0xFF) | AD7746_CAPSETUP_CAPEN; + vt_setup = chip->vt_setup & ~AD7746_VTSETUP_VTEN; + delay = ad7746_cap_filter_rate_table[(chip->config >> 3) & + 0x7][1]; + + if (chip->capdac_set != chan->channel) { + ret = i2c_smbus_write_byte_data(chip->client, + AD7746_REG_CAPDACA, + chip->capdac[chan->channel][0]); + if (ret < 0) + return ret; + ret = i2c_smbus_write_byte_data(chip->client, + AD7746_REG_CAPDACB, + chip->capdac[chan->channel][1]); + if (ret < 0) + return ret; + + chip->capdac_set = chan->channel; + } + break; + case IIO_VOLTAGE: + case IIO_TEMP: + vt_setup = (chan->address & 0xFF) | AD7746_VTSETUP_VTEN; + cap_setup = chip->cap_setup & ~AD7746_CAPSETUP_CAPEN; + delay = ad7746_cap_filter_rate_table[(chip->config >> 6) & + 0x3][1]; + break; + default: + return -EINVAL; + } + + if (chip->cap_setup != cap_setup) { + ret = i2c_smbus_write_byte_data(chip->client, + AD7746_REG_CAP_SETUP, + cap_setup); + if (ret < 0) + return ret; + + chip->cap_setup = cap_setup; + } + + if (chip->vt_setup != vt_setup) { + ret = i2c_smbus_write_byte_data(chip->client, + AD7746_REG_VT_SETUP, + vt_setup); + if (ret < 0) + return ret; + + chip->vt_setup = vt_setup; + } + + return delay; +} + +static inline ssize_t ad7746_start_calib(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len, + u8 regval) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad7746_chip_info *chip = iio_priv(indio_dev); + bool doit; + int ret, timeout = 10; + + ret = strtobool(buf, &doit); + if (ret < 0) + return ret; + + if (!doit) + return 0; + + mutex_lock(&indio_dev->mlock); + regval |= chip->config; + ret = i2c_smbus_write_byte_data(chip->client, AD7746_REG_CFG, regval); + if (ret < 0) { + mutex_unlock(&indio_dev->mlock); + return ret; + } + + do { + msleep(20); + ret = i2c_smbus_read_byte_data(chip->client, AD7746_REG_CFG); + if (ret < 0) { + mutex_unlock(&indio_dev->mlock); + return ret; + } + } while ((ret == regval) && timeout--); + + mutex_unlock(&indio_dev->mlock); + + return len; +} + +static ssize_t ad7746_start_offset_calib(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + int ret = ad7746_select_channel(indio_dev, + &ad7746_channels[to_iio_dev_attr(attr)->address]); + if (ret < 0) + return ret; + + return ad7746_start_calib(dev, attr, buf, len, + AD7746_CONF_MODE_OFFS_CAL); +} + +static ssize_t ad7746_start_gain_calib(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + int ret = ad7746_select_channel(indio_dev, + &ad7746_channels[to_iio_dev_attr(attr)->address]); + if (ret < 0) + return ret; + + return ad7746_start_calib(dev, attr, buf, len, + AD7746_CONF_MODE_GAIN_CAL); +} + +static IIO_DEVICE_ATTR(in_capacitance0_calibbias_calibration, + S_IWUSR, NULL, ad7746_start_offset_calib, CIN1); +static IIO_DEVICE_ATTR(in_capacitance1_calibbias_calibration, + S_IWUSR, NULL, ad7746_start_offset_calib, CIN2); +static IIO_DEVICE_ATTR(in_capacitance0_calibscale_calibration, + S_IWUSR, NULL, ad7746_start_gain_calib, CIN1); +static IIO_DEVICE_ATTR(in_capacitance1_calibscale_calibration, + S_IWUSR, NULL, ad7746_start_gain_calib, CIN2); +static IIO_DEVICE_ATTR(in_voltage0_calibscale_calibration, + S_IWUSR, NULL, ad7746_start_gain_calib, VIN); + +static ssize_t ad7746_show_cap_filter_rate_setup(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad7746_chip_info *chip = iio_priv(indio_dev); + + return sprintf(buf, "%d\n", ad7746_cap_filter_rate_table[ + (chip->config >> 3) & 0x7][0]); +} + +static ssize_t ad7746_store_cap_filter_rate_setup(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad7746_chip_info *chip = iio_priv(indio_dev); + u8 data; + int ret, i; + + ret = kstrtou8(buf, 10, &data); + if (ret < 0) + return ret; + + for (i = 0; i < ARRAY_SIZE(ad7746_cap_filter_rate_table); i++) + if (data >= ad7746_cap_filter_rate_table[i][0]) + break; + + if (i >= ARRAY_SIZE(ad7746_cap_filter_rate_table)) + i = ARRAY_SIZE(ad7746_cap_filter_rate_table) - 1; + + mutex_lock(&indio_dev->mlock); + chip->config &= ~AD7746_CONF_CAPFS(0x7); + chip->config |= AD7746_CONF_CAPFS(i); + mutex_unlock(&indio_dev->mlock); + + return len; +} + +static ssize_t ad7746_show_vt_filter_rate_setup(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad7746_chip_info *chip = iio_priv(indio_dev); + + return sprintf(buf, "%d\n", ad7746_vt_filter_rate_table[ + (chip->config >> 6) & 0x3][0]); +} + +static ssize_t ad7746_store_vt_filter_rate_setup(struct device *dev, + struct device_attribute *attr, + const char *buf, + size_t len) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ad7746_chip_info *chip = iio_priv(indio_dev); + u8 data; + int ret, i; + + ret = kstrtou8(buf, 10, &data); + if (ret < 0) + return ret; + + for (i = 0; i < ARRAY_SIZE(ad7746_vt_filter_rate_table); i++) + if (data >= ad7746_vt_filter_rate_table[i][0]) + break; + + if (i >= ARRAY_SIZE(ad7746_vt_filter_rate_table)) + i = ARRAY_SIZE(ad7746_vt_filter_rate_table) - 1; + + mutex_lock(&indio_dev->mlock); + chip->config &= ~AD7746_CONF_VTFS(0x3); + chip->config |= AD7746_CONF_VTFS(i); + mutex_unlock(&indio_dev->mlock); + + return len; +} + +static IIO_DEVICE_ATTR(in_capacitance_sampling_frequency, + S_IRUGO | S_IWUSR, ad7746_show_cap_filter_rate_setup, + ad7746_store_cap_filter_rate_setup, 0); + +static IIO_DEVICE_ATTR(in_voltage_sampling_frequency, + S_IRUGO | S_IWUSR, ad7746_show_vt_filter_rate_setup, + ad7746_store_vt_filter_rate_setup, 0); + +static IIO_CONST_ATTR(in_voltage_sampling_frequency_available, "50 31 16 8"); +static IIO_CONST_ATTR(in_capacitance_sampling_frequency_available, + "91 84 50 26 16 13 11 9"); + +static struct attribute *ad7746_attributes[] = { + &iio_dev_attr_in_capacitance_sampling_frequency.dev_attr.attr, + &iio_dev_attr_in_voltage_sampling_frequency.dev_attr.attr, + &iio_dev_attr_in_capacitance0_calibbias_calibration.dev_attr.attr, + &iio_dev_attr_in_capacitance0_calibscale_calibration.dev_attr.attr, + &iio_dev_attr_in_capacitance1_calibscale_calibration.dev_attr.attr, + &iio_dev_attr_in_capacitance1_calibbias_calibration.dev_attr.attr, + &iio_dev_attr_in_voltage0_calibscale_calibration.dev_attr.attr, + &iio_const_attr_in_voltage_sampling_frequency_available.dev_attr.attr, + &iio_const_attr_in_capacitance_sampling_frequency_available. + dev_attr.attr, + NULL, +}; + +static const struct attribute_group ad7746_attribute_group = { + .attrs = ad7746_attributes, +}; + +static int ad7746_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long mask) +{ + struct ad7746_chip_info *chip = iio_priv(indio_dev); + int ret, reg; + + mutex_lock(&indio_dev->mlock); + + switch (mask) { + case (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE): + if (val != 1) { + ret = -EINVAL; + goto out; + } + + val = (val2 * 1024) / 15625; + + switch (chan->type) { + case IIO_CAPACITANCE: + reg = AD7746_REG_CAP_GAINH; + break; + case IIO_VOLTAGE: + reg = AD7746_REG_VOLT_GAINH; + break; + default: + ret = -EINVAL; + goto out; + } + + ret = i2c_smbus_write_word_data(chip->client, reg, swab16(val)); + if (ret < 0) + goto out; + + ret = 0; + break; + case (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED): + if ((val < 0) | (val > 0xFFFF)) { + ret = -EINVAL; + goto out; + } + ret = i2c_smbus_write_word_data(chip->client, + AD7746_REG_CAP_OFFH, swab16(val)); + if (ret < 0) + goto out; + + ret = 0; + break; + case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE): + if ((val < 0) | (val > 43008000)) { /* 21pF */ + ret = -EINVAL; + goto out; + } + + /* CAPDAC Scale = 21pF_typ / 127 + * CIN Scale = 8.192pF / 2^24 + * Offset Scale = CAPDAC Scale / CIN Scale = 338646 + * */ + + val /= 338646; + + chip->capdac[chan->channel][chan->differential] = (val > 0 ? + AD7746_CAPDAC_DACP(val) | AD7746_CAPDAC_DACEN : 0); + + ret = i2c_smbus_write_byte_data(chip->client, + AD7746_REG_CAPDACA, + chip->capdac[chan->channel][0]); + if (ret < 0) + goto out; + ret = i2c_smbus_write_byte_data(chip->client, + AD7746_REG_CAPDACB, + chip->capdac[chan->channel][1]); + if (ret < 0) + goto out; + + chip->capdac_set = chan->channel; + + ret = 0; + break; + default: + ret = -EINVAL; + } + +out: + mutex_unlock(&indio_dev->mlock); + return ret; +} + +static int ad7746_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, + long mask) +{ + struct ad7746_chip_info *chip = iio_priv(indio_dev); + int ret, delay; + u8 regval, reg; + + union { + u32 d32; + u8 d8[4]; + } data; + + mutex_lock(&indio_dev->mlock); + + switch (mask) { + case 0: + ret = ad7746_select_channel(indio_dev, chan); + if (ret < 0) + goto out; + delay = ret; + + regval = chip->config | AD7746_CONF_MODE_SINGLE_CONV; + ret = i2c_smbus_write_byte_data(chip->client, AD7746_REG_CFG, + regval); + if (ret < 0) + goto out; + + msleep(delay); + /* Now read the actual register */ + + ret = i2c_smbus_read_i2c_block_data(chip->client, + chan->address >> 8, 3, &data.d8[1]); + + if (ret < 0) + goto out; + + *val = (be32_to_cpu(data.d32) & 0xFFFFFF) - 0x800000; + + switch (chan->type) { + case IIO_TEMP: + /* temperature in milli degrees Celsius + * T = ((*val / 2048) - 4096) * 1000 + */ + *val = (*val * 125) / 256; + break; + case IIO_VOLTAGE: + if (chan->channel == 1) /* supply_raw*/ + *val = *val * 6; + break; + default: + break; + } + + ret = IIO_VAL_INT; + break; + case (1 << IIO_CHAN_INFO_CALIBSCALE_SEPARATE): + switch (chan->type) { + case IIO_CAPACITANCE: + reg = AD7746_REG_CAP_GAINH; + break; + case IIO_VOLTAGE: + reg = AD7746_REG_VOLT_GAINH; + break; + default: + ret = -EINVAL; + goto out; + } + + ret = i2c_smbus_read_word_data(chip->client, reg); + if (ret < 0) + goto out; + /* 1 + gain_val / 2^16 */ + *val = 1; + *val2 = (15625 * swab16(ret)) / 1024; + + ret = IIO_VAL_INT_PLUS_MICRO; + break; + case (1 << IIO_CHAN_INFO_CALIBBIAS_SHARED): + ret = i2c_smbus_read_word_data(chip->client, + AD7746_REG_CAP_OFFH); + if (ret < 0) + goto out; + *val = swab16(ret); + + ret = IIO_VAL_INT; + break; + case (1 << IIO_CHAN_INFO_OFFSET_SEPARATE): + *val = AD7746_CAPDAC_DACP(chip->capdac[chan->channel] + [chan->differential]) * 338646; + + ret = IIO_VAL_INT; + break; + case (1 << IIO_CHAN_INFO_SCALE_SHARED): + switch (chan->type) { + case IIO_CAPACITANCE: + /* 8.192pf / 2^24 */ + *val2 = 488; + *val = 0; + break; + case IIO_VOLTAGE: + /* 1170mV / 2^23 */ + *val2 = 139475; + *val = 0; + break; + default: + ret = -EINVAL; + goto out; + } + + ret = IIO_VAL_INT_PLUS_NANO; + break; + default: + ret = -EINVAL; + }; +out: + mutex_unlock(&indio_dev->mlock); + return ret; +} + +static const struct iio_info ad7746_info = { + .attrs = &ad7746_attribute_group, + .read_raw = &ad7746_read_raw, + .write_raw = &ad7746_write_raw, + .driver_module = THIS_MODULE, +}; + +/* + * device probe and remove + */ + +static int __devinit ad7746_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct ad7746_platform_data *pdata = client->dev.platform_data; + struct ad7746_chip_info *chip; + struct iio_dev *indio_dev; + int ret = 0; + unsigned char regval = 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; + chip->capdac_set = -1; + + /* Establish that the iio_dev is a child of the i2c device */ + indio_dev->name = id->name; + indio_dev->dev.parent = &client->dev; + indio_dev->info = &ad7746_info; + indio_dev->channels = ad7746_channels; + if (id->driver_data == 7746) + indio_dev->num_channels = ARRAY_SIZE(ad7746_channels); + else + indio_dev->num_channels = ARRAY_SIZE(ad7746_channels) - 2; + indio_dev->num_channels = ARRAY_SIZE(ad7746_channels); + indio_dev->modes = INDIO_DIRECT_MODE; + + if (pdata) { + if (pdata->exca_en) { + if (pdata->exca_inv_en) + regval |= AD7746_EXCSETUP_NEXCA; + else + regval |= AD7746_EXCSETUP_EXCA; + } + + if (pdata->excb_en) { + if (pdata->excb_inv_en) + regval |= AD7746_EXCSETUP_NEXCB; + else + regval |= AD7746_EXCSETUP_EXCB; + } + + regval |= AD7746_EXCSETUP_EXCLVL(pdata->exclvl); + } else { + dev_warn(&client->dev, "No platform data? using default\n"); + regval = AD7746_EXCSETUP_EXCA | AD7746_EXCSETUP_EXCB | + AD7746_EXCSETUP_EXCLVL(3); + } + + ret = i2c_smbus_write_byte_data(chip->client, + AD7746_REG_EXC_SETUP, regval); + if (ret < 0) + goto error_free_dev; + + ret = iio_device_register(indio_dev); + if (ret) + goto error_free_dev; + + dev_info(&client->dev, "%s capacitive sensor registered\n", id->name); + + return 0; + +error_free_dev: + iio_free_device(indio_dev); +error_ret: + return ret; +} + +static int __devexit ad7746_remove(struct i2c_client *client) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(client); + + iio_device_unregister(indio_dev); + + return 0; +} + +static const struct i2c_device_id ad7746_id[] = { + { "ad7745", 7745 }, + { "ad7746", 7746 }, + { "ad7747", 7747 }, + {} +}; + +MODULE_DEVICE_TABLE(i2c, ad7746_id); + +static struct i2c_driver ad7746_driver = { + .driver = { + .name = KBUILD_MODNAME, + }, + .probe = ad7746_probe, + .remove = __devexit_p(ad7746_remove), + .id_table = ad7746_id, +}; + +static __init int ad7746_init(void) +{ + return i2c_add_driver(&ad7746_driver); +} + +static __exit void ad7746_exit(void) +{ + i2c_del_driver(&ad7746_driver); +} + +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("Analog Devices AD7746/5/7 capacitive sensor driver"); +MODULE_LICENSE("GPL v2"); + +module_init(ad7746_init); +module_exit(ad7746_exit); diff --git a/drivers/staging/iio/adc/ad7746.h b/drivers/staging/iio/adc/ad7746.h new file mode 100644 index 000000000000..ea8572d1df02 --- /dev/null +++ b/drivers/staging/iio/adc/ad7746.h @@ -0,0 +1,29 @@ +/* + * AD7746 capacitive sensor driver supporting AD7745, AD7746 and AD7747 + * + * Copyright 2011 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#ifndef IIO_CDC_AD7746_H_ +#define IIO_CDC_AD7746_H_ + +/* + * TODO: struct ad7746_platform_data needs to go into include/linux/iio + */ + +#define AD7466_EXCLVL_0 0 /* +-VDD/8 */ +#define AD7466_EXCLVL_1 1 /* +-VDD/4 */ +#define AD7466_EXCLVL_2 2 /* +-VDD * 3/8 */ +#define AD7466_EXCLVL_3 3 /* +-VDD/2 */ + +struct ad7746_platform_data { + unsigned char exclvl; /*Excitation Voltage Level */ + bool exca_en; /* enables EXCA pin as the excitation output */ + bool exca_inv_en; /* enables /EXCA pin as the excitation output */ + bool excb_en; /* enables EXCB pin as the excitation output */ + bool excb_inv_en; /* enables /EXCB pin as the excitation output */ +}; + +#endif /* IIO_CDC_AD7746_H_ */ |