588 lines
14 KiB
C
588 lines
14 KiB
C
/*
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* AD7152 capacitive sensor driver supporting AD7152/3
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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/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/i2c.h>
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#include <linux/module.h>
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#include "../iio.h"
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#include "../sysfs.h"
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/*
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* AD7152 registers definition
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*/
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#define AD7152_STATUS 0
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#define AD7152_STATUS_RDY1 (1 << 0)
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#define AD7152_STATUS_RDY2 (1 << 1)
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#define AD7152_CH1_DATA_HIGH 1
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#define AD7152_CH1_DATA_LOW 2
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#define AD7152_CH2_DATA_HIGH 3
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#define AD7152_CH2_DATA_LOW 4
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#define AD7152_CH1_OFFS_HIGH 5
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#define AD7152_CH1_OFFS_LOW 6
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#define AD7152_CH2_OFFS_HIGH 7
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#define AD7152_CH2_OFFS_LOW 8
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#define AD7152_CH1_GAIN_HIGH 9
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#define AD7152_CH1_GAIN_LOW 10
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#define AD7152_CH1_SETUP 11
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#define AD7152_CH2_GAIN_HIGH 12
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#define AD7152_CH2_GAIN_LOW 13
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#define AD7152_CH2_SETUP 14
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#define AD7152_CFG 15
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#define AD7152_RESEVERD 16
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#define AD7152_CAPDAC_POS 17
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#define AD7152_CAPDAC_NEG 18
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#define AD7152_CFG2 26
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#define AD7152_MAX_CONV_MODE 6
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/*
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* struct ad7152_chip_info - chip specifc information
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*/
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struct ad7152_chip_info {
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struct i2c_client *client;
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u16 ch1_offset; /* Channel 1 offset calibration coefficient */
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u16 ch1_gain; /* Channel 1 gain coefficient */
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u8 ch1_setup;
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u16 ch2_offset; /* Channel 2 offset calibration coefficient */
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u16 ch2_gain; /* Channel 1 gain coefficient */
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u8 ch2_setup;
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u8 filter_rate_setup; /* Capacitive channel digital filter setup; conversion time/update rate setup per channel */
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char *conversion_mode;
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};
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struct ad7152_conversion_mode {
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char *name;
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u8 reg_cfg;
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};
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static struct ad7152_conversion_mode
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ad7152_conv_mode_table[AD7152_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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* ad7152 register access by I2C
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*/
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static int ad7152_i2c_read(struct ad7152_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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}
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return ret;
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}
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static int ad7152_i2c_write(struct ad7152_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_CH1_OFFSET(_mode, _show, _store) \
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IIO_DEVICE_ATTR(ch1_offset, _mode, _show, _store, 0)
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#define IIO_DEV_ATTR_CH2_OFFSET(_mode, _show, _store) \
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IIO_DEVICE_ATTR(ch2_offset, _mode, _show, _store, 0)
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#define IIO_DEV_ATTR_CH1_GAIN(_mode, _show, _store) \
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IIO_DEVICE_ATTR(ch1_gain, _mode, _show, _store, 0)
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#define IIO_DEV_ATTR_CH2_GAIN(_mode, _show, _store) \
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IIO_DEVICE_ATTR(ch2_gain, _mode, _show, _store, 0)
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#define IIO_DEV_ATTR_CH1_VALUE(_show) \
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IIO_DEVICE_ATTR(ch1_value, S_IRUGO, _show, NULL, 0)
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#define IIO_DEV_ATTR_CH2_VALUE(_show) \
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IIO_DEVICE_ATTR(ch2_value, S_IRUGO, _show, NULL, 0)
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#define IIO_DEV_ATTR_CH1_SETUP(_mode, _show, _store) \
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IIO_DEVICE_ATTR(ch1_setup, _mode, _show, _store, 0)
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#define IIO_DEV_ATTR_CH2_SETUP(_mode, _show, _store) \
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IIO_DEVICE_ATTR(ch2_setup, _mode, _show, _store, 0)
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#define IIO_DEV_ATTR_FILTER_RATE_SETUP(_mode, _show, _store) \
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IIO_DEVICE_ATTR(filter_rate_setup, _mode, _show, _store, 0)
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static ssize_t ad7152_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 < AD7152_MAX_CONV_MODE; i++)
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len += sprintf(buf + len, "%s ", ad7152_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(ad7152_show_conversion_modes);
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static ssize_t ad7152_show_ch1_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 ad7152_chip_info *chip = iio_priv(dev_info);
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u8 data[2];
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ad7152_i2c_read(chip, AD7152_CH1_DATA_HIGH, data, 2);
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return sprintf(buf, "%d\n", ((int)data[0] << 8) | data[1]);
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}
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static IIO_DEV_ATTR_CH1_VALUE(ad7152_show_ch1_value);
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static ssize_t ad7152_show_ch2_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 ad7152_chip_info *chip = iio_priv(dev_info);
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u8 data[2];
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ad7152_i2c_read(chip, AD7152_CH2_DATA_HIGH, data, 2);
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return sprintf(buf, "%d\n", ((int)data[0] << 8) | data[1]);
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}
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static IIO_DEV_ATTR_CH2_VALUE(ad7152_show_ch2_value);
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static ssize_t ad7152_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 ad7152_chip_info *chip = iio_priv(dev_info);
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return sprintf(buf, "%s\n", chip->conversion_mode);
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}
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static ssize_t ad7152_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 ad7152_chip_info *chip = iio_priv(dev_info);
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u8 cfg;
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int i;
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ad7152_i2c_read(chip, AD7152_CFG, &cfg, 1);
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for (i = 0; i < AD7152_MAX_CONV_MODE; i++)
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if (strncmp(buf, ad7152_conv_mode_table[i].name,
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strlen(ad7152_conv_mode_table[i].name) - 1) == 0) {
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chip->conversion_mode = ad7152_conv_mode_table[i].name;
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cfg |= 0x18 | ad7152_conv_mode_table[i].reg_cfg;
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ad7152_i2c_write(chip, AD7152_CFG, cfg);
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return len;
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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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ad7152_show_conversion_mode,
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ad7152_store_conversion_mode);
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static ssize_t ad7152_show_ch1_offset(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 ad7152_chip_info *chip = iio_priv(dev_info);
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return sprintf(buf, "%d\n", chip->ch1_offset);
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}
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static ssize_t ad7152_store_ch1_offset(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 ad7152_chip_info *chip = iio_priv(dev_info);
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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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ad7152_i2c_write(chip, AD7152_CH1_OFFS_HIGH, data >> 8);
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ad7152_i2c_write(chip, AD7152_CH1_OFFS_LOW, data);
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chip->ch1_offset = 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_CH1_OFFSET(S_IRUGO | S_IWUSR,
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ad7152_show_ch1_offset,
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ad7152_store_ch1_offset);
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static ssize_t ad7152_show_ch2_offset(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 ad7152_chip_info *chip = iio_priv(dev_info);
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return sprintf(buf, "%d\n", chip->ch2_offset);
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}
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static ssize_t ad7152_store_ch2_offset(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 ad7152_chip_info *chip = iio_priv(dev_info);
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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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ad7152_i2c_write(chip, AD7152_CH2_OFFS_HIGH, data >> 8);
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ad7152_i2c_write(chip, AD7152_CH2_OFFS_LOW, data);
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chip->ch2_offset = 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_CH2_OFFSET(S_IRUGO | S_IWUSR,
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ad7152_show_ch2_offset,
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ad7152_store_ch2_offset);
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static ssize_t ad7152_show_ch1_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 ad7152_chip_info *chip = iio_priv(dev_info);
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return sprintf(buf, "%d\n", chip->ch1_gain);
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}
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static ssize_t ad7152_store_ch1_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 ad7152_chip_info *chip = iio_priv(dev_info);
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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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ad7152_i2c_write(chip, AD7152_CH1_GAIN_HIGH, data >> 8);
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ad7152_i2c_write(chip, AD7152_CH1_GAIN_LOW, data);
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chip->ch1_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_CH1_GAIN(S_IRUGO | S_IWUSR,
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ad7152_show_ch1_gain,
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ad7152_store_ch1_gain);
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static ssize_t ad7152_show_ch2_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 ad7152_chip_info *chip = iio_priv(dev_info);
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return sprintf(buf, "%d\n", chip->ch2_gain);
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}
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static ssize_t ad7152_store_ch2_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 ad7152_chip_info *chip = iio_priv(dev_info);
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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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ad7152_i2c_write(chip, AD7152_CH2_GAIN_HIGH, data >> 8);
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ad7152_i2c_write(chip, AD7152_CH2_GAIN_LOW, data);
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chip->ch2_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_CH2_GAIN(S_IRUGO | S_IWUSR,
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ad7152_show_ch2_gain,
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ad7152_store_ch2_gain);
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static ssize_t ad7152_show_ch1_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 ad7152_chip_info *chip = iio_priv(dev_info);
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return sprintf(buf, "0x%02x\n", chip->ch1_setup);
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}
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static ssize_t ad7152_store_ch1_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 ad7152_chip_info *chip = iio_priv(dev_info);
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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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ad7152_i2c_write(chip, AD7152_CH1_SETUP, data);
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chip->ch1_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_CH1_SETUP(S_IRUGO | S_IWUSR,
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ad7152_show_ch1_setup,
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ad7152_store_ch1_setup);
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static ssize_t ad7152_show_ch2_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 ad7152_chip_info *chip = iio_priv(dev_info);
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return sprintf(buf, "0x%02x\n", chip->ch2_setup);
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}
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static ssize_t ad7152_store_ch2_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 ad7152_chip_info *chip = iio_priv(dev_info);
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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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ad7152_i2c_write(chip, AD7152_CH2_SETUP, data);
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chip->ch2_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_CH2_SETUP(S_IRUGO | S_IWUSR,
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ad7152_show_ch2_setup,
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ad7152_store_ch2_setup);
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static ssize_t ad7152_show_filter_rate_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 ad7152_chip_info *chip = iio_priv(dev_info);
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return sprintf(buf, "0x%02x\n", chip->filter_rate_setup);
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}
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static ssize_t ad7152_store_filter_rate_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 ad7152_chip_info *chip = iio_priv(dev_info);
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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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ad7152_i2c_write(chip, AD7152_CFG2, data);
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chip->filter_rate_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_FILTER_RATE_SETUP(S_IRUGO | S_IWUSR,
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ad7152_show_filter_rate_setup,
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ad7152_store_filter_rate_setup);
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static struct attribute *ad7152_attributes[] = {
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&iio_dev_attr_available_conversion_modes.dev_attr.attr,
|
|
&iio_dev_attr_conversion_mode.dev_attr.attr,
|
|
&iio_dev_attr_ch1_gain.dev_attr.attr,
|
|
&iio_dev_attr_ch2_gain.dev_attr.attr,
|
|
&iio_dev_attr_ch1_offset.dev_attr.attr,
|
|
&iio_dev_attr_ch2_offset.dev_attr.attr,
|
|
&iio_dev_attr_ch1_value.dev_attr.attr,
|
|
&iio_dev_attr_ch2_value.dev_attr.attr,
|
|
&iio_dev_attr_ch1_setup.dev_attr.attr,
|
|
&iio_dev_attr_ch2_setup.dev_attr.attr,
|
|
&iio_dev_attr_filter_rate_setup.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group ad7152_attribute_group = {
|
|
.attrs = ad7152_attributes,
|
|
};
|
|
|
|
static const struct iio_info ad7152_info = {
|
|
.attrs = &ad7152_attribute_group,
|
|
.driver_module = THIS_MODULE,
|
|
};
|
|
/*
|
|
* device probe and remove
|
|
*/
|
|
|
|
static int __devinit ad7152_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
int ret = 0;
|
|
struct ad7152_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;
|
|
|
|
/* Echipabilish 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 = &ad7152_info;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret)
|
|
goto error_free_dev;
|
|
|
|
dev_err(&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 ad7152_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 ad7152_id[] = {
|
|
{ "ad7152", 0 },
|
|
{ "ad7153", 0 },
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, ad7152_id);
|
|
|
|
static struct i2c_driver ad7152_driver = {
|
|
.driver = {
|
|
.name = "ad7152",
|
|
},
|
|
.probe = ad7152_probe,
|
|
.remove = __devexit_p(ad7152_remove),
|
|
.id_table = ad7152_id,
|
|
};
|
|
|
|
static __init int ad7152_init(void)
|
|
{
|
|
return i2c_add_driver(&ad7152_driver);
|
|
}
|
|
|
|
static __exit void ad7152_exit(void)
|
|
{
|
|
i2c_del_driver(&ad7152_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
|
|
MODULE_DESCRIPTION("Analog Devices ad7152/3 capacitive sensor driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
module_init(ad7152_init);
|
|
module_exit(ad7152_exit);
|