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staging: iio: adc: new driver for AD7745/6/7 devices
Signed-off-by: Barry Song <barry.song@analog.com> Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
parent
f84c26e61e
commit
671d85f2aa
@ -85,9 +85,9 @@ config AD799X_RING_BUFFER
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config AD7476
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tristate "Analog Devices AD7475/6/7/8 AD7466/7/8 and AD7495 ADC driver"
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depends on SPI
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select IIO_RING_BUFFER
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select IIO_RING_BUFFER
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select IIO_SW_RING
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select IIO_TRIGGER
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select IIO_TRIGGER
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help
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Say yes here to build support for Analog Devices
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AD7475, AD7476, AD7477, AD7478, AD7466, AD7467, AD7468, AD7495
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@ -96,3 +96,13 @@ config AD7476
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To compile this driver as a module, choose M here: the
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module will be called ad7476.
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config AD7745
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tristate "Analog Devices AD7745, AD7746 AD7747 capacitive sensor driver"
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depends on I2C
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help
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Say yes here to build support for Analog Devices capacitive sensors.
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(AD7745, AD7746, AD7747) Provides direct access via sysfs.
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To compile this driver as a module, choose M here: the
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module will be called ad7745.
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@ -20,3 +20,4 @@ obj-$(CONFIG_AD7152) += ad7152.o
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obj-$(CONFIG_AD7291) += ad7291.o
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obj-$(CONFIG_AD7298) += ad7298.o
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obj-$(CONFIG_AD7314) += ad7314.o
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obj-$(CONFIG_AD7745) += ad7745.o
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734
drivers/staging/iio/adc/ad7745.c
Normal file
734
drivers/staging/iio/adc/ad7745.c
Normal file
@ -0,0 +1,734 @@
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/*
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* AD774X capacitive sensor driver supporting AD7745/6/7
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*
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* Copyright 2010 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/interrupt.h>
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#include <linux/gpio.h>
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#include <linux/workqueue.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/list.h>
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#include <linux/i2c.h>
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#include <linux/rtc.h>
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#include "../iio.h"
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#include "../sysfs.h"
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/*
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* AD774X registers definition
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*/
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#define AD774X_STATUS 0
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#define AD774X_STATUS_RDY (1 << 2)
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#define AD774X_STATUS_RDYVT (1 << 1)
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#define AD774X_STATUS_RDYCAP (1 << 0)
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#define AD774X_CAP_DATA_HIGH 1
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#define AD774X_CAP_DATA_MID 2
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#define AD774X_CAP_DATA_LOW 3
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#define AD774X_VT_DATA_HIGH 4
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#define AD774X_VT_DATA_MID 5
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#define AD774X_VT_DATA_LOW 6
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#define AD774X_CAP_SETUP 7
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#define AD774X_VT_SETUP 8
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#define AD774X_EXEC_SETUP 9
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#define AD774X_CFG 10
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#define AD774X_CAPDACA 11
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#define AD774X_CAPDACB 12
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#define AD774X_CAPDAC_EN (1 << 7)
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#define AD774X_CAP_OFFH 13
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#define AD774X_CAP_OFFL 14
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#define AD774X_CAP_GAINH 15
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#define AD774X_CAP_GAINL 16
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#define AD774X_VOLT_GAINH 17
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#define AD774X_VOLT_GAINL 18
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#define AD774X_MAX_CONV_MODE 6
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/*
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* struct ad774x_chip_info - chip specifc information
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*/
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struct ad774x_chip_info {
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const char *name;
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struct i2c_client *client;
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struct iio_dev *indio_dev;
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struct work_struct thresh_work;
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bool inter;
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s64 last_timestamp;
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u16 cap_offs; /* Capacitive offset */
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u16 cap_gain; /* Capacitive gain calibration */
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u16 volt_gain; /* Voltage gain calibration */
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u8 cap_setup;
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u8 vt_setup;
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u8 exec_setup;
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char *conversion_mode;
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};
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struct ad774x_conversion_mode {
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char *name;
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u8 reg_cfg;
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};
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struct ad774x_conversion_mode ad774x_conv_mode_table[AD774X_MAX_CONV_MODE] = {
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{ "idle", 0 },
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{ "continuous-conversion", 1 },
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{ "single-conversion", 2 },
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{ "power-down", 3 },
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{ "offset-calibration", 5 },
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{ "gain-calibration", 6 },
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};
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/*
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* ad774x register access by I2C
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*/
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static int ad774x_i2c_read(struct ad774x_chip_info *chip, u8 reg, u8 *data, int len)
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{
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struct i2c_client *client = chip->client;
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int ret;
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ret = i2c_master_send(client, ®, 1);
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if (ret < 0) {
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dev_err(&client->dev, "I2C write error\n");
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return ret;
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}
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ret = i2c_master_recv(client, data, len);
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if (ret < 0) {
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dev_err(&client->dev, "I2C read error\n");
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return ret;
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}
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return ret;
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}
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static int ad774x_i2c_write(struct ad774x_chip_info *chip, u8 reg, u8 data)
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{
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struct i2c_client *client = chip->client;
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int ret;
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u8 tx[2] = {
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reg,
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data,
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};
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ret = i2c_master_send(client, tx, 2);
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if (ret < 0)
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dev_err(&client->dev, "I2C write error\n");
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return ret;
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}
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/*
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* sysfs nodes
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*/
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#define IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(_show) \
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IIO_DEVICE_ATTR(available_conversion_modes, S_IRUGO, _show, NULL, 0)
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#define IIO_DEV_ATTR_CONVERSION_MODE(_mode, _show, _store) \
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IIO_DEVICE_ATTR(conversion_mode, _mode, _show, _store, 0)
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#define IIO_DEV_ATTR_CAP_SETUP(_mode, _show, _store) \
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IIO_DEVICE_ATTR(cap_setup, _mode, _show, _store, 0)
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#define IIO_DEV_ATTR_VT_SETUP(_mode, _show, _store) \
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IIO_DEVICE_ATTR(in0_setup, _mode, _show, _store, 0)
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#define IIO_DEV_ATTR_EXEC_SETUP(_mode, _show, _store) \
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IIO_DEVICE_ATTR(exec_setup, _mode, _show, _store, 0)
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#define IIO_DEV_ATTR_VOLT_GAIN(_mode, _show, _store) \
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IIO_DEVICE_ATTR(in0_gain, _mode, _show, _store, 0)
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#define IIO_DEV_ATTR_CAP_OFFS(_mode, _show, _store) \
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IIO_DEVICE_ATTR(cap_offs, _mode, _show, _store, 0)
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#define IIO_DEV_ATTR_CAP_GAIN(_mode, _show, _store) \
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IIO_DEVICE_ATTR(cap_gain, _mode, _show, _store, 0)
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#define IIO_DEV_ATTR_CAP_DATA(_show) \
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IIO_DEVICE_ATTR(cap0_raw, S_IRUGO, _show, NULL, 0)
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#define IIO_DEV_ATTR_VT_DATA(_show) \
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IIO_DEVICE_ATTR(in0_raw, S_IRUGO, _show, NULL, 0)
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static ssize_t ad774x_show_conversion_modes(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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int i;
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int len = 0;
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for (i = 0; i < AD774X_MAX_CONV_MODE; i++)
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len += sprintf(buf + len, "%s ", ad774x_conv_mode_table[i].name);
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len += sprintf(buf + len, "\n");
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return len;
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}
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static IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(ad774x_show_conversion_modes);
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static ssize_t ad774x_show_conversion_mode(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad774x_chip_info *chip = dev_info->dev_data;
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return sprintf(buf, "%s\n", chip->conversion_mode);
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}
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static ssize_t ad774x_store_conversion_mode(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad774x_chip_info *chip = dev_info->dev_data;
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u8 cfg;
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int i;
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ad774x_i2c_read(chip, AD774X_CFG, &cfg, 1);
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for (i = 0; i < AD774X_MAX_CONV_MODE; i++) {
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if (strncmp(buf, ad774x_conv_mode_table[i].name,
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strlen(ad774x_conv_mode_table[i].name) - 1) == 0) {
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chip->conversion_mode = ad774x_conv_mode_table[i].name;
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cfg |= 0x18 | ad774x_conv_mode_table[i].reg_cfg;
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ad774x_i2c_write(chip, AD774X_CFG, cfg);
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return len;
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}
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}
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dev_err(dev, "not supported conversion mode\n");
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return -EINVAL;
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}
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static IIO_DEV_ATTR_CONVERSION_MODE(S_IRUGO | S_IWUSR,
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ad774x_show_conversion_mode,
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ad774x_store_conversion_mode);
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static ssize_t ad774x_show_dac_value(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad774x_chip_info *chip = dev_info->dev_data;
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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u8 data;
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ad774x_i2c_read(chip, this_attr->address, &data, 1);
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return sprintf(buf, "%02x\n", data & 0x7F);
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}
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static ssize_t ad774x_store_dac_value(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad774x_chip_info *chip = dev_info->dev_data;
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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unsigned long data;
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int ret;
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ret = strict_strtoul(buf, 10, &data);
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if (!ret) {
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ad774x_i2c_write(chip, this_attr->address,
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(data ? AD774X_CAPDAC_EN : 0) | (data & 0x7F));
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return len;
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}
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return -EINVAL;
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}
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static IIO_DEVICE_ATTR(capdac0_raw, S_IRUGO | S_IWUSR,
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ad774x_show_dac_value,
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ad774x_store_dac_value,
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AD774X_CAPDACA);
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static IIO_DEVICE_ATTR(capdac1_raw, S_IRUGO | S_IWUSR,
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ad774x_show_dac_value,
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ad774x_store_dac_value,
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AD774X_CAPDACB);
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static ssize_t ad774x_show_cap_setup(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad774x_chip_info *chip = dev_info->dev_data;
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return sprintf(buf, "0x%02x\n", chip->cap_setup);
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}
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static ssize_t ad774x_store_cap_setup(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad774x_chip_info *chip = dev_info->dev_data;
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unsigned long data;
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int ret;
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ret = strict_strtoul(buf, 10, &data);
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if ((!ret) && (data < 0x100)) {
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ad774x_i2c_write(chip, AD774X_CAP_SETUP, data);
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chip->cap_setup = data;
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return len;
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}
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return -EINVAL;
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}
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static IIO_DEV_ATTR_CAP_SETUP(S_IRUGO | S_IWUSR,
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ad774x_show_cap_setup,
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ad774x_store_cap_setup);
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static ssize_t ad774x_show_vt_setup(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad774x_chip_info *chip = dev_info->dev_data;
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return sprintf(buf, "0x%02x\n", chip->vt_setup);
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}
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static ssize_t ad774x_store_vt_setup(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad774x_chip_info *chip = dev_info->dev_data;
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unsigned long data;
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int ret;
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ret = strict_strtoul(buf, 10, &data);
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if ((!ret) && (data < 0x100)) {
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ad774x_i2c_write(chip, AD774X_VT_SETUP, data);
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chip->vt_setup = data;
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return len;
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}
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return -EINVAL;
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}
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static IIO_DEV_ATTR_VT_SETUP(S_IRUGO | S_IWUSR,
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ad774x_show_vt_setup,
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ad774x_store_vt_setup);
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static ssize_t ad774x_show_exec_setup(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad774x_chip_info *chip = dev_info->dev_data;
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return sprintf(buf, "0x%02x\n", chip->exec_setup);
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}
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static ssize_t ad774x_store_exec_setup(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad774x_chip_info *chip = dev_info->dev_data;
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unsigned long data;
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int ret;
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ret = strict_strtoul(buf, 10, &data);
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if ((!ret) && (data < 0x100)) {
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ad774x_i2c_write(chip, AD774X_EXEC_SETUP, data);
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chip->exec_setup = data;
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return len;
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}
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return -EINVAL;
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}
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static IIO_DEV_ATTR_EXEC_SETUP(S_IRUGO | S_IWUSR,
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ad774x_show_exec_setup,
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ad774x_store_exec_setup);
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static ssize_t ad774x_show_volt_gain(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad774x_chip_info *chip = dev_info->dev_data;
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return sprintf(buf, "%d\n", chip->volt_gain);
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}
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static ssize_t ad774x_store_volt_gain(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t len)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad774x_chip_info *chip = dev_info->dev_data;
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unsigned long data;
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int ret;
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ret = strict_strtoul(buf, 10, &data);
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if ((!ret) && (data < 0x10000)) {
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ad774x_i2c_write(chip, AD774X_VOLT_GAINH, data >> 8);
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ad774x_i2c_write(chip, AD774X_VOLT_GAINL, data);
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chip->volt_gain = data;
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return len;
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}
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return -EINVAL;
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}
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static IIO_DEV_ATTR_VOLT_GAIN(S_IRUGO | S_IWUSR,
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ad774x_show_volt_gain,
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ad774x_store_volt_gain);
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static ssize_t ad774x_show_cap_data(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad774x_chip_info *chip = dev_info->dev_data;
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unsigned long data;
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char tmp[3];
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ad774x_i2c_read(chip, AD774X_CAP_DATA_HIGH, tmp, 3);
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data = ((int)tmp[0] << 16) | ((int)tmp[1] << 8) | (int)tmp[2];
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return sprintf(buf, "%ld\n", data);
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}
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static IIO_DEV_ATTR_CAP_DATA(ad774x_show_cap_data);
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||||
|
||||
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 = dev_info->dev_data;
|
||||
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 = dev_info->dev_data;
|
||||
|
||||
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 = dev_info->dev_data;
|
||||
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 = dev_info->dev_data;
|
||||
|
||||
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 = dev_info->dev_data;
|
||||
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 ssize_t ad774x_show_name(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
||||
struct ad774x_chip_info *chip = dev_info->dev_data;
|
||||
return sprintf(buf, "%s\n", chip->name);
|
||||
}
|
||||
|
||||
static IIO_DEVICE_ATTR(name, S_IRUGO, ad774x_show_name, NULL, 0);
|
||||
|
||||
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_cap_setup.dev_attr.attr,
|
||||
&iio_dev_attr_in0_setup.dev_attr.attr,
|
||||
&iio_dev_attr_exec_setup.dev_attr.attr,
|
||||
&iio_dev_attr_cap_offs.dev_attr.attr,
|
||||
&iio_dev_attr_cap_gain.dev_attr.attr,
|
||||
&iio_dev_attr_in0_gain.dev_attr.attr,
|
||||
&iio_dev_attr_in0_raw.dev_attr.attr,
|
||||
&iio_dev_attr_cap0_raw.dev_attr.attr,
|
||||
&iio_dev_attr_capdac0_raw.dev_attr.attr,
|
||||
&iio_dev_attr_capdac1_raw.dev_attr.attr,
|
||||
&iio_dev_attr_name.dev_attr.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static const struct attribute_group ad774x_attribute_group = {
|
||||
.attrs = ad774x_attributes,
|
||||
};
|
||||
|
||||
/*
|
||||
* data ready events
|
||||
*/
|
||||
|
||||
#define IIO_EVENT_CODE_CAP_RDY IIO_BUFFER_EVENT_CODE(0)
|
||||
#define IIO_EVENT_CODE_VT_RDY IIO_BUFFER_EVENT_CODE(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 void ad774x_interrupt_handler_bh(struct work_struct *work_s)
|
||||
{
|
||||
struct ad774x_chip_info *chip =
|
||||
container_of(work_s, struct ad774x_chip_info, thresh_work);
|
||||
u8 int_status;
|
||||
|
||||
enable_irq(chip->client->irq);
|
||||
|
||||
ad774x_i2c_read(chip, AD774X_STATUS, &int_status, 1);
|
||||
|
||||
if (int_status & AD774X_STATUS_RDYCAP)
|
||||
iio_push_event(chip->indio_dev, 0,
|
||||
IIO_EVENT_CODE_CAP_RDY,
|
||||
chip->last_timestamp);
|
||||
|
||||
if (int_status & AD774X_STATUS_RDYVT)
|
||||
iio_push_event(chip->indio_dev, 0,
|
||||
IIO_EVENT_CODE_VT_RDY,
|
||||
chip->last_timestamp);
|
||||
}
|
||||
|
||||
static int ad774x_interrupt_handler_th(struct iio_dev *dev_info,
|
||||
int index,
|
||||
s64 timestamp,
|
||||
int no_test)
|
||||
{
|
||||
struct ad774x_chip_info *chip = dev_info->dev_data;
|
||||
|
||||
chip->last_timestamp = timestamp;
|
||||
schedule_work(&chip->thresh_work);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
IIO_EVENT_SH(data_rdy, &ad774x_interrupt_handler_th);
|
||||
|
||||
static ssize_t ad774x_query_out_mode(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
char *buf)
|
||||
{
|
||||
/*
|
||||
* AD774X provides one /RDY pin, which can be used as interrupt
|
||||
* but the pin is not configurable
|
||||
*/
|
||||
return sprintf(buf, "1\n");
|
||||
}
|
||||
|
||||
static ssize_t ad774x_set_out_mode(struct device *dev,
|
||||
struct device_attribute *attr,
|
||||
const char *buf,
|
||||
size_t len)
|
||||
{
|
||||
return len;
|
||||
}
|
||||
|
||||
IIO_EVENT_ATTR_CAP_RDY_SH(iio_event_data_rdy, ad774x_query_out_mode, ad774x_set_out_mode, 0);
|
||||
IIO_EVENT_ATTR_VT_RDY_SH(iio_event_data_rdy, ad774x_query_out_mode, ad774x_set_out_mode, 0);
|
||||
|
||||
static struct attribute *ad774x_event_attributes[] = {
|
||||
&iio_event_attr_cap_rdy.dev_attr.attr,
|
||||
&iio_event_attr_vt_rdy.dev_attr.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static struct attribute_group ad774x_event_attribute_group = {
|
||||
.attrs = ad774x_event_attributes,
|
||||
};
|
||||
|
||||
/*
|
||||
* device probe and remove
|
||||
*/
|
||||
|
||||
static int __devinit ad774x_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
int ret = 0, regdone = 0;
|
||||
struct ad774x_chip_info *chip = kzalloc(sizeof(*chip), GFP_KERNEL);
|
||||
if (chip == NULL) {
|
||||
ret = -ENOMEM;
|
||||
goto error_ret;
|
||||
}
|
||||
|
||||
/* 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;
|
||||
}
|
||||
|
||||
/* Establish that the iio_dev is a child of the i2c device */
|
||||
chip->indio_dev->dev.parent = &client->dev;
|
||||
chip->indio_dev->attrs = &ad774x_attribute_group;
|
||||
chip->indio_dev->event_attrs = &ad774x_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;
|
||||
regdone = 1;
|
||||
|
||||
if (client->irq) {
|
||||
ret = iio_register_interrupt_line(client->irq,
|
||||
chip->indio_dev,
|
||||
0,
|
||||
IRQF_TRIGGER_FALLING,
|
||||
"ad774x");
|
||||
if (ret)
|
||||
goto error_free_dev;
|
||||
|
||||
iio_add_event_to_list(iio_event_attr_cap_rdy.listel,
|
||||
&chip->indio_dev->interrupts[0]->ev_list);
|
||||
|
||||
INIT_WORK(&chip->thresh_work, ad774x_interrupt_handler_bh);
|
||||
}
|
||||
|
||||
dev_err(&client->dev, "%s capacitive sensor registered, irq: %d\n", id->name, client->irq);
|
||||
|
||||
return 0;
|
||||
|
||||
error_free_dev:
|
||||
if (regdone)
|
||||
iio_device_unregister(chip->indio_dev);
|
||||
else
|
||||
iio_free_device(chip->indio_dev);
|
||||
error_free_chip:
|
||||
kfree(chip);
|
||||
error_ret:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devexit ad774x_remove(struct i2c_client *client)
|
||||
{
|
||||
struct ad774x_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);
|
||||
kfree(chip);
|
||||
|
||||
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);
|
Loading…
Reference in New Issue
Block a user