1040 lines
25 KiB
C
1040 lines
25 KiB
C
/*
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* AD7291 digital temperature sensor driver supporting AD7291
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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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* AD7291 registers definition
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*/
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#define AD7291_COMMAND 0
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#define AD7291_VOLTAGE 1
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#define AD7291_T_SENSE 2
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#define AD7291_T_AVERAGE 3
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#define AD7291_VOLTAGE_LIMIT_BASE 4
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#define AD7291_VOLTAGE_LIMIT_COUNT 8
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#define AD7291_T_SENSE_HIGH 0x1c
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#define AD7291_T_SENSE_LOW 0x1d
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#define AD7291_T_SENSE_HYST 0x1e
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#define AD7291_VOLTAGE_ALERT_STATUS 0x1f
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#define AD7291_T_ALERT_STATUS 0x20
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/*
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* AD7291 command
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*/
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#define AD7291_AUTOCYCLE 0x1
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#define AD7291_RESET 0x2
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#define AD7291_ALART_CLEAR 0x4
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#define AD7291_ALART_POLARITY 0x8
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#define AD7291_EXT_REF 0x10
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#define AD7291_NOISE_DELAY 0x20
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#define AD7291_T_SENSE_MASK 0x40
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#define AD7291_VOLTAGE_MASK 0xff00
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#define AD7291_VOLTAGE_OFFSET 0x8
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/*
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* AD7291 value masks
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*/
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#define AD7291_CHANNEL_MASK 0xf000
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#define AD7291_VALUE_MASK 0xfff
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#define AD7291_T_VALUE_SIGN 0x400
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#define AD7291_T_VALUE_FLOAT_OFFSET 2
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#define AD7291_T_VALUE_FLOAT_MASK 0x2
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/*
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* struct ad7291_chip_info - chip specifc information
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*/
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struct ad7291_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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s64 last_timestamp;
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u16 command;
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u8 channels; /* Active voltage channels */
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};
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/*
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* struct ad7291_chip_info - chip specifc information
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*/
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struct ad7291_limit_regs {
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u16 data_high;
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u16 data_low;
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u16 hysteresis;
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};
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/*
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* ad7291 register access by I2C
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*/
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static int ad7291_i2c_read(struct ad7291_chip_info *chip, u8 reg, u16 *data)
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{
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struct i2c_client *client = chip->client;
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int ret = 0;
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ret = i2c_smbus_read_word_data(client, reg);
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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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*data = swab16((u16)ret);
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return 0;
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}
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static int ad7291_i2c_write(struct ad7291_chip_info *chip, u8 reg, u16 data)
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{
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struct i2c_client *client = chip->client;
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int ret = 0;
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ret = i2c_smbus_write_word_data(client, reg, swab16(data));
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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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/* Returns negative errno, or else the number of words read. */
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static int ad7291_i2c_read_data(struct ad7291_chip_info *chip, u8 reg, u16 *data)
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{
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struct i2c_client *client = chip->client;
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u8 commands[4];
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int ret = 0;
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int i, count;
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if (reg == AD7291_T_SENSE || reg == AD7291_T_AVERAGE)
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count = 2;
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else if (reg == AD7291_VOLTAGE) {
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if (!chip->channels) {
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dev_err(&client->dev, "No voltage channel is selected.\n");
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return -EINVAL;
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}
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count = 2 + chip->channels * 2;
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} else {
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dev_err(&client->dev, "I2C wrong data register\n");
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return -EINVAL;
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}
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commands[0] = 0;
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commands[1] = (chip->command >> 8) & 0xff;
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commands[2] = chip->command & 0xff;
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commands[3] = reg;
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ret = i2c_master_send(client, commands, 4);
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if (ret < 0) {
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dev_err(&client->dev, "I2C master send error\n");
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return ret;
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}
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ret = i2c_master_recv(client, (u8 *)data, count);
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if (ret < 0) {
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dev_err(&client->dev, "I2C master receive error\n");
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return ret;
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}
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ret >>= 2;
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for (i = 0; i < ret; i++)
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data[i] = swab16(data[i]);
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return ret;
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}
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static ssize_t ad7291_show_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 ad7291_chip_info *chip = dev_info->dev_data;
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if (chip->command & AD7291_AUTOCYCLE)
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return sprintf(buf, "autocycle\n");
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else
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return sprintf(buf, "command\n");
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}
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static ssize_t ad7291_store_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 ad7291_chip_info *chip = dev_info->dev_data;
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u16 command;
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int ret;
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command = chip->command & (~AD7291_AUTOCYCLE);
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if (strcmp(buf, "autocycle"))
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command |= AD7291_AUTOCYCLE;
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ret = ad7291_i2c_write(chip, AD7291_COMMAND, command);
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if (ret)
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return -EIO;
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chip->command = command;
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return ret;
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}
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static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
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ad7291_show_mode,
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ad7291_store_mode,
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0);
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static ssize_t ad7291_show_available_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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return sprintf(buf, "command\nautocycle\n");
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}
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static IIO_DEVICE_ATTR(available_modes, S_IRUGO, ad7291_show_available_modes, NULL, 0);
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static ssize_t ad7291_store_reset(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 ad7291_chip_info *chip = dev_info->dev_data;
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u16 command;
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int ret;
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command = chip->command | AD7291_RESET;
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ret = ad7291_i2c_write(chip, AD7291_COMMAND, command);
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if (ret)
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return -EIO;
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return ret;
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}
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static IIO_DEVICE_ATTR(reset, S_IWUSR,
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NULL,
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ad7291_store_reset,
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0);
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static ssize_t ad7291_show_ext_ref(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 ad7291_chip_info *chip = dev_info->dev_data;
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return sprintf(buf, "%d\n", !!(chip->command & AD7291_EXT_REF));
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}
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static ssize_t ad7291_store_ext_ref(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 ad7291_chip_info *chip = dev_info->dev_data;
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u16 command;
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int ret;
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command = chip->command & (~AD7291_EXT_REF);
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if (strcmp(buf, "1"))
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command |= AD7291_EXT_REF;
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ret = ad7291_i2c_write(chip, AD7291_COMMAND, command);
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if (ret)
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return -EIO;
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chip->command = command;
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return ret;
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}
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static IIO_DEVICE_ATTR(ext_ref, S_IRUGO | S_IWUSR,
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ad7291_show_ext_ref,
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ad7291_store_ext_ref,
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0);
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static ssize_t ad7291_show_noise_delay(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 ad7291_chip_info *chip = dev_info->dev_data;
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return sprintf(buf, "%d\n", !!(chip->command & AD7291_NOISE_DELAY));
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}
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static ssize_t ad7291_store_noise_delay(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 ad7291_chip_info *chip = dev_info->dev_data;
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u16 command;
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int ret;
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command = chip->command & (~AD7291_NOISE_DELAY);
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if (strcmp(buf, "1"))
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command |= AD7291_NOISE_DELAY;
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ret = ad7291_i2c_write(chip, AD7291_COMMAND, command);
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if (ret)
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return -EIO;
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chip->command = command;
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return ret;
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}
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static IIO_DEVICE_ATTR(noise_delay, S_IRUGO | S_IWUSR,
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ad7291_show_noise_delay,
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ad7291_store_noise_delay,
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0);
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static ssize_t ad7291_show_t_sense(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 ad7291_chip_info *chip = dev_info->dev_data;
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u16 data;
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char sign = ' ';
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int ret;
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ret = ad7291_i2c_read_data(chip, AD7291_T_SENSE, &data);
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if (ret)
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return -EIO;
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if (data & AD7291_T_VALUE_SIGN) {
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/* convert supplement to positive value */
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data = (AD7291_T_VALUE_SIGN << 1) - data;
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sign = '-';
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}
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return sprintf(buf, "%c%d.%.2d\n", sign,
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(data >> AD7291_T_VALUE_FLOAT_OFFSET),
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(data & AD7291_T_VALUE_FLOAT_MASK) * 25);
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}
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static IIO_DEVICE_ATTR(t_sense, S_IRUGO, ad7291_show_t_sense, NULL, 0);
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static ssize_t ad7291_show_t_average(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 ad7291_chip_info *chip = dev_info->dev_data;
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u16 data;
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char sign = ' ';
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int ret;
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ret = ad7291_i2c_read_data(chip, AD7291_T_AVERAGE, &data);
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if (ret)
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return -EIO;
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if (data & AD7291_T_VALUE_SIGN) {
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/* convert supplement to positive value */
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data = (AD7291_T_VALUE_SIGN << 1) - data;
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sign = '-';
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}
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return sprintf(buf, "%c%d.%.2d\n", sign,
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(data >> AD7291_T_VALUE_FLOAT_OFFSET),
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(data & AD7291_T_VALUE_FLOAT_MASK) * 25);
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}
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static IIO_DEVICE_ATTR(t_average, S_IRUGO, ad7291_show_t_average, NULL, 0);
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static ssize_t ad7291_show_voltage(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 ad7291_chip_info *chip = dev_info->dev_data;
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u16 data[AD7291_VOLTAGE_LIMIT_COUNT];
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int i, size, ret;
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ret = ad7291_i2c_read_data(chip, AD7291_VOLTAGE, data);
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if (ret)
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return -EIO;
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for (i = 0; i < AD7291_VOLTAGE_LIMIT_COUNT; i++) {
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if (chip->command & (AD7291_T_SENSE_MASK << i)) {
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ret = sprintf(buf, "channel[%d]=%d\n", i,
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data[i] & AD7291_VALUE_MASK);
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if (ret < 0)
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break;
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buf += ret;
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size += ret;
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}
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}
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return size;
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}
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static IIO_DEVICE_ATTR(voltage, S_IRUGO, ad7291_show_voltage, NULL, 0);
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static ssize_t ad7291_show_channel_mask(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 ad7291_chip_info *chip = dev_info->dev_data;
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return sprintf(buf, "0x%x\n", (chip->command & AD7291_VOLTAGE_MASK) >>
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AD7291_VOLTAGE_OFFSET);
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}
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static ssize_t ad7291_store_channel_mask(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 ad7291_chip_info *chip = dev_info->dev_data;
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u16 command;
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unsigned long data;
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int i, ret;
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ret = strict_strtoul(buf, 16, &data);
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if (ret || data > 0xff)
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return -EINVAL;
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command = chip->command & (~AD7291_VOLTAGE_MASK);
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command |= data << AD7291_VOLTAGE_OFFSET;
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ret = ad7291_i2c_write(chip, AD7291_COMMAND, command);
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if (ret)
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return -EIO;
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chip->command = command;
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for (i = 0, chip->channels = 0; i < AD7291_VOLTAGE_LIMIT_COUNT; i++) {
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if (chip->command & (AD7291_T_SENSE_MASK << i))
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chip->channels++;
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}
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return ret;
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}
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static IIO_DEVICE_ATTR(channel_mask, S_IRUGO | S_IWUSR,
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ad7291_show_channel_mask,
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ad7291_store_channel_mask,
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0);
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static ssize_t ad7291_show_name(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 ad7291_chip_info *chip = dev_info->dev_data;
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return sprintf(buf, "%s\n", chip->name);
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}
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static IIO_DEVICE_ATTR(name, S_IRUGO, ad7291_show_name, NULL, 0);
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static struct attribute *ad7291_attributes[] = {
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&iio_dev_attr_available_modes.dev_attr.attr,
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&iio_dev_attr_mode.dev_attr.attr,
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&iio_dev_attr_reset.dev_attr.attr,
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&iio_dev_attr_ext_ref.dev_attr.attr,
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&iio_dev_attr_noise_delay.dev_attr.attr,
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&iio_dev_attr_t_sense.dev_attr.attr,
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&iio_dev_attr_t_average.dev_attr.attr,
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&iio_dev_attr_voltage.dev_attr.attr,
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&iio_dev_attr_channel_mask.dev_attr.attr,
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&iio_dev_attr_name.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group ad7291_attribute_group = {
|
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.attrs = ad7291_attributes,
|
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};
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|
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/*
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* temperature bound events
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*/
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|
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#define IIO_EVENT_CODE_AD7291_T_SENSE_HIGH IIO_BUFFER_EVENT_CODE(0)
|
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#define IIO_EVENT_CODE_AD7291_T_SENSE_LOW IIO_BUFFER_EVENT_CODE(1)
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#define IIO_EVENT_CODE_AD7291_T_AVG_HIGH IIO_BUFFER_EVENT_CODE(2)
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#define IIO_EVENT_CODE_AD7291_T_AVG_LOW IIO_BUFFER_EVENT_CODE(3)
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#define IIO_EVENT_CODE_AD7291_VOLTAGE_BASE IIO_BUFFER_EVENT_CODE(4)
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|
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static void ad7291_interrupt_bh(struct work_struct *work_s)
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{
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struct ad7291_chip_info *chip =
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container_of(work_s, struct ad7291_chip_info, thresh_work);
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u16 t_status, v_status;
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u16 command;
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int i;
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if (ad7291_i2c_read(chip, AD7291_T_ALERT_STATUS, &t_status))
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return;
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if (ad7291_i2c_read(chip, AD7291_VOLTAGE_ALERT_STATUS, &v_status))
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return;
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if (!(t_status || v_status))
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return;
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command = chip->command | AD7291_ALART_CLEAR;
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ad7291_i2c_write(chip, AD7291_COMMAND, command);
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|
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command = chip->command & ~AD7291_ALART_CLEAR;
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ad7291_i2c_write(chip, AD7291_COMMAND, command);
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|
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enable_irq(chip->client->irq);
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|
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for (i = 0; i < 4; i++) {
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if (t_status & (1 << i))
|
|
iio_push_event(chip->indio_dev, 0,
|
|
IIO_EVENT_CODE_AD7291_T_SENSE_HIGH + i,
|
|
chip->last_timestamp);
|
|
}
|
|
|
|
for (i = 0; i < AD7291_VOLTAGE_LIMIT_COUNT*2; i++) {
|
|
if (v_status & (1 << i))
|
|
iio_push_event(chip->indio_dev, 0,
|
|
IIO_EVENT_CODE_AD7291_VOLTAGE_BASE + i,
|
|
chip->last_timestamp);
|
|
}
|
|
}
|
|
|
|
static int ad7291_interrupt(struct iio_dev *dev_info,
|
|
int index,
|
|
s64 timestamp,
|
|
int no_test)
|
|
{
|
|
struct ad7291_chip_info *chip = dev_info->dev_data;
|
|
|
|
chip->last_timestamp = timestamp;
|
|
schedule_work(&chip->thresh_work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
IIO_EVENT_SH(ad7291, &ad7291_interrupt);
|
|
|
|
static inline ssize_t ad7291_show_t_bound(struct device *dev,
|
|
struct device_attribute *attr,
|
|
u8 bound_reg,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct ad7291_chip_info *chip = dev_info->dev_data;
|
|
u16 data;
|
|
char sign = ' ';
|
|
int ret;
|
|
|
|
ret = ad7291_i2c_read(chip, bound_reg, &data);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
data &= AD7291_VALUE_MASK;
|
|
if (data & AD7291_T_VALUE_SIGN) {
|
|
/* convert supplement to positive value */
|
|
data = (AD7291_T_VALUE_SIGN << 1) - data;
|
|
sign = '-';
|
|
}
|
|
|
|
return sprintf(buf, "%c%d.%.2d\n", sign,
|
|
data >> AD7291_T_VALUE_FLOAT_OFFSET,
|
|
(data & AD7291_T_VALUE_FLOAT_MASK) * 25);
|
|
}
|
|
|
|
static inline ssize_t ad7291_set_t_bound(struct device *dev,
|
|
struct device_attribute *attr,
|
|
u8 bound_reg,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct ad7291_chip_info *chip = dev_info->dev_data;
|
|
long tmp1, tmp2;
|
|
u16 data;
|
|
char *pos;
|
|
int ret;
|
|
|
|
pos = strchr(buf, '.');
|
|
|
|
ret = strict_strtol(buf, 10, &tmp1);
|
|
|
|
if (ret || tmp1 > 127 || tmp1 < -128)
|
|
return -EINVAL;
|
|
|
|
if (pos) {
|
|
len = strlen(pos);
|
|
if (len > AD7291_T_VALUE_FLOAT_OFFSET)
|
|
len = AD7291_T_VALUE_FLOAT_OFFSET;
|
|
pos[len] = 0;
|
|
ret = strict_strtol(pos, 10, &tmp2);
|
|
|
|
if (!ret)
|
|
tmp2 = (tmp2 / 25) * 25;
|
|
}
|
|
|
|
if (tmp1 < 0)
|
|
data = (u16)(-tmp1);
|
|
else
|
|
data = (u16)tmp1;
|
|
data = (data << AD7291_T_VALUE_FLOAT_OFFSET) |
|
|
(tmp2 & AD7291_T_VALUE_FLOAT_MASK);
|
|
if (tmp1 < 0)
|
|
/* convert positive value to supplyment */
|
|
data = (AD7291_T_VALUE_SIGN << 1) - data;
|
|
|
|
ret = ad7291_i2c_write(chip, bound_reg, data);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t ad7291_show_t_sense_high(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return ad7291_show_t_bound(dev, attr,
|
|
AD7291_T_SENSE_HIGH, buf);
|
|
}
|
|
|
|
static inline ssize_t ad7291_set_t_sense_high(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
return ad7291_set_t_bound(dev, attr,
|
|
AD7291_T_SENSE_HIGH, buf, len);
|
|
}
|
|
|
|
static ssize_t ad7291_show_t_sense_low(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return ad7291_show_t_bound(dev, attr,
|
|
AD7291_T_SENSE_LOW, buf);
|
|
}
|
|
|
|
static inline ssize_t ad7291_set_t_sense_low(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
return ad7291_set_t_bound(dev, attr,
|
|
AD7291_T_SENSE_LOW, buf, len);
|
|
}
|
|
|
|
static ssize_t ad7291_show_t_sense_hyst(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return ad7291_show_t_bound(dev, attr,
|
|
AD7291_T_SENSE_HYST, buf);
|
|
}
|
|
|
|
static inline ssize_t ad7291_set_t_sense_hyst(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
return ad7291_set_t_bound(dev, attr,
|
|
AD7291_T_SENSE_HYST, buf, len);
|
|
}
|
|
|
|
static inline ssize_t ad7291_show_v_bound(struct device *dev,
|
|
struct device_attribute *attr,
|
|
u8 bound_reg,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct ad7291_chip_info *chip = dev_info->dev_data;
|
|
u16 data;
|
|
int ret;
|
|
|
|
if (bound_reg < AD7291_VOLTAGE_LIMIT_BASE ||
|
|
bound_reg >= AD7291_VOLTAGE_LIMIT_BASE +
|
|
AD7291_VOLTAGE_LIMIT_COUNT)
|
|
return -EINVAL;
|
|
|
|
ret = ad7291_i2c_read(chip, bound_reg, &data);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
data &= AD7291_VALUE_MASK;
|
|
|
|
return sprintf(buf, "%d\n", data);
|
|
}
|
|
|
|
static inline ssize_t ad7291_set_v_bound(struct device *dev,
|
|
struct device_attribute *attr,
|
|
u8 bound_reg,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct ad7291_chip_info *chip = dev_info->dev_data;
|
|
unsigned long value;
|
|
u16 data;
|
|
int ret;
|
|
|
|
if (bound_reg < AD7291_VOLTAGE_LIMIT_BASE ||
|
|
bound_reg >= AD7291_VOLTAGE_LIMIT_BASE +
|
|
AD7291_VOLTAGE_LIMIT_COUNT)
|
|
return -EINVAL;
|
|
|
|
ret = strict_strtoul(buf, 10, &value);
|
|
|
|
if (ret || value >= 4096)
|
|
return -EINVAL;
|
|
|
|
data = (u16)value;
|
|
ret = ad7291_i2c_write(chip, bound_reg, data);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ad7291_get_voltage_limit_regs(const char *channel)
|
|
{
|
|
int index;
|
|
|
|
if (strlen(channel) < 3 && channel[0] != 'v')
|
|
return -EINVAL;
|
|
|
|
index = channel[1] - '0';
|
|
if (index >= AD7291_VOLTAGE_LIMIT_COUNT)
|
|
return -EINVAL;
|
|
|
|
return index;
|
|
}
|
|
|
|
static ssize_t ad7291_show_voltage_high(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
int regs;
|
|
|
|
regs = ad7291_get_voltage_limit_regs(attr->attr.name);
|
|
|
|
if (regs < 0)
|
|
return regs;
|
|
|
|
return ad7291_show_t_bound(dev, attr, regs, buf);
|
|
}
|
|
|
|
static inline ssize_t ad7291_set_voltage_high(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
int regs;
|
|
|
|
regs = ad7291_get_voltage_limit_regs(attr->attr.name);
|
|
|
|
if (regs < 0)
|
|
return regs;
|
|
|
|
return ad7291_set_t_bound(dev, attr, regs, buf, len);
|
|
}
|
|
|
|
static ssize_t ad7291_show_voltage_low(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
int regs;
|
|
|
|
regs = ad7291_get_voltage_limit_regs(attr->attr.name);
|
|
|
|
if (regs < 0)
|
|
return regs;
|
|
|
|
return ad7291_show_t_bound(dev, attr, regs+1, buf);
|
|
}
|
|
|
|
static inline ssize_t ad7291_set_voltage_low(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
int regs;
|
|
|
|
regs = ad7291_get_voltage_limit_regs(attr->attr.name);
|
|
|
|
if (regs < 0)
|
|
return regs;
|
|
|
|
return ad7291_set_t_bound(dev, attr, regs+1, buf, len);
|
|
}
|
|
|
|
static ssize_t ad7291_show_voltage_hyst(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
int regs;
|
|
|
|
regs = ad7291_get_voltage_limit_regs(attr->attr.name);
|
|
|
|
if (regs < 0)
|
|
return regs;
|
|
|
|
return ad7291_show_t_bound(dev, attr, regs+2, buf);
|
|
}
|
|
|
|
static inline ssize_t ad7291_set_voltage_hyst(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
int regs;
|
|
|
|
regs = ad7291_get_voltage_limit_regs(attr->attr.name);
|
|
|
|
if (regs < 0)
|
|
return regs;
|
|
|
|
return ad7291_set_t_bound(dev, attr, regs+2, buf, len);
|
|
}
|
|
|
|
IIO_EVENT_ATTR_SH(t_sense_high, iio_event_ad7291,
|
|
ad7291_show_t_sense_high, ad7291_set_t_sense_high, 0);
|
|
IIO_EVENT_ATTR_SH(t_sense_low, iio_event_ad7291,
|
|
ad7291_show_t_sense_low, ad7291_set_t_sense_low, 0);
|
|
IIO_EVENT_ATTR_SH(t_sense_hyst, iio_event_ad7291,
|
|
ad7291_show_t_sense_hyst, ad7291_set_t_sense_hyst, 0);
|
|
|
|
IIO_EVENT_ATTR_SH(v0_high, iio_event_ad7291,
|
|
ad7291_show_voltage_high, ad7291_set_voltage_high, 0);
|
|
IIO_EVENT_ATTR_SH(v0_low, iio_event_ad7291,
|
|
ad7291_show_voltage_low, ad7291_set_voltage_low, 0);
|
|
IIO_EVENT_ATTR_SH(v0_hyst, iio_event_ad7291,
|
|
ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0);
|
|
IIO_EVENT_ATTR_SH(v1_high, iio_event_ad7291,
|
|
ad7291_show_voltage_high, ad7291_set_voltage_high, 0);
|
|
IIO_EVENT_ATTR_SH(v1_low, iio_event_ad7291,
|
|
ad7291_show_voltage_low, ad7291_set_voltage_low, 0);
|
|
IIO_EVENT_ATTR_SH(v1_hyst, iio_event_ad7291,
|
|
ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0);
|
|
IIO_EVENT_ATTR_SH(v2_high, iio_event_ad7291,
|
|
ad7291_show_voltage_high, ad7291_set_voltage_high, 0);
|
|
IIO_EVENT_ATTR_SH(v2_low, iio_event_ad7291,
|
|
ad7291_show_voltage_low, ad7291_set_voltage_low, 0);
|
|
IIO_EVENT_ATTR_SH(v2_hyst, iio_event_ad7291,
|
|
ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0);
|
|
IIO_EVENT_ATTR_SH(v3_high, iio_event_ad7291,
|
|
ad7291_show_voltage_high, ad7291_set_voltage_high, 0);
|
|
IIO_EVENT_ATTR_SH(v3_low, iio_event_ad7291,
|
|
ad7291_show_voltage_low, ad7291_set_voltage_low, 0);
|
|
IIO_EVENT_ATTR_SH(v3_hyst, iio_event_ad7291,
|
|
ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0);
|
|
IIO_EVENT_ATTR_SH(v4_high, iio_event_ad7291,
|
|
ad7291_show_voltage_high, ad7291_set_voltage_high, 0);
|
|
IIO_EVENT_ATTR_SH(v4_low, iio_event_ad7291,
|
|
ad7291_show_voltage_low, ad7291_set_voltage_low, 0);
|
|
IIO_EVENT_ATTR_SH(v4_hyst, iio_event_ad7291,
|
|
ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0);
|
|
IIO_EVENT_ATTR_SH(v5_high, iio_event_ad7291,
|
|
ad7291_show_voltage_high, ad7291_set_voltage_high, 0);
|
|
IIO_EVENT_ATTR_SH(v5_low, iio_event_ad7291,
|
|
ad7291_show_voltage_low, ad7291_set_voltage_low, 0);
|
|
IIO_EVENT_ATTR_SH(v5_hyst, iio_event_ad7291,
|
|
ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0);
|
|
IIO_EVENT_ATTR_SH(v6_high, iio_event_ad7291,
|
|
ad7291_show_voltage_high, ad7291_set_voltage_high, 0);
|
|
IIO_EVENT_ATTR_SH(v6_low, iio_event_ad7291,
|
|
ad7291_show_voltage_low, ad7291_set_voltage_low, 0);
|
|
IIO_EVENT_ATTR_SH(v6_hyst, iio_event_ad7291,
|
|
ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0);
|
|
IIO_EVENT_ATTR_SH(v7_high, iio_event_ad7291,
|
|
ad7291_show_voltage_high, ad7291_set_voltage_high, 0);
|
|
IIO_EVENT_ATTR_SH(v7_low, iio_event_ad7291,
|
|
ad7291_show_voltage_low, ad7291_set_voltage_low, 0);
|
|
IIO_EVENT_ATTR_SH(v7_hyst, iio_event_ad7291,
|
|
ad7291_show_voltage_hyst, ad7291_set_voltage_hyst, 0);
|
|
|
|
static struct attribute *ad7291_event_attributes[] = {
|
|
&iio_event_attr_t_sense_high.dev_attr.attr,
|
|
&iio_event_attr_t_sense_low.dev_attr.attr,
|
|
&iio_event_attr_t_sense_hyst.dev_attr.attr,
|
|
&iio_event_attr_v0_high.dev_attr.attr,
|
|
&iio_event_attr_v0_low.dev_attr.attr,
|
|
&iio_event_attr_v0_hyst.dev_attr.attr,
|
|
&iio_event_attr_v1_high.dev_attr.attr,
|
|
&iio_event_attr_v1_low.dev_attr.attr,
|
|
&iio_event_attr_v1_hyst.dev_attr.attr,
|
|
&iio_event_attr_v2_high.dev_attr.attr,
|
|
&iio_event_attr_v2_low.dev_attr.attr,
|
|
&iio_event_attr_v2_hyst.dev_attr.attr,
|
|
&iio_event_attr_v3_high.dev_attr.attr,
|
|
&iio_event_attr_v3_low.dev_attr.attr,
|
|
&iio_event_attr_v3_hyst.dev_attr.attr,
|
|
&iio_event_attr_v4_high.dev_attr.attr,
|
|
&iio_event_attr_v4_low.dev_attr.attr,
|
|
&iio_event_attr_v4_hyst.dev_attr.attr,
|
|
&iio_event_attr_v5_high.dev_attr.attr,
|
|
&iio_event_attr_v5_low.dev_attr.attr,
|
|
&iio_event_attr_v5_hyst.dev_attr.attr,
|
|
&iio_event_attr_v6_high.dev_attr.attr,
|
|
&iio_event_attr_v6_low.dev_attr.attr,
|
|
&iio_event_attr_v6_hyst.dev_attr.attr,
|
|
&iio_event_attr_v7_high.dev_attr.attr,
|
|
&iio_event_attr_v7_low.dev_attr.attr,
|
|
&iio_event_attr_v7_hyst.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group ad7291_event_attribute_group = {
|
|
.attrs = ad7291_event_attributes,
|
|
};
|
|
|
|
/*
|
|
* device probe and remove
|
|
*/
|
|
|
|
static int __devinit ad7291_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct ad7291_chip_info *chip;
|
|
int ret = 0;
|
|
|
|
chip = kzalloc(sizeof(struct ad7291_chip_info), GFP_KERNEL);
|
|
|
|
if (chip == NULL)
|
|
return -ENOMEM;
|
|
|
|
/* this is only used for device removal purposes */
|
|
i2c_set_clientdata(client, chip);
|
|
|
|
chip->client = client;
|
|
chip->name = id->name;
|
|
chip->command = AD7291_NOISE_DELAY | AD7291_T_SENSE_MASK;
|
|
|
|
chip->indio_dev = iio_allocate_device();
|
|
if (chip->indio_dev == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_free_chip;
|
|
}
|
|
|
|
chip->indio_dev->dev.parent = &client->dev;
|
|
chip->indio_dev->attrs = &ad7291_attribute_group;
|
|
chip->indio_dev->event_attrs = &ad7291_event_attribute_group;
|
|
chip->indio_dev->dev_data = (void *)chip;
|
|
chip->indio_dev->driver_module = THIS_MODULE;
|
|
chip->indio_dev->num_interrupt_lines = 1;
|
|
chip->indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
ret = iio_device_register(chip->indio_dev);
|
|
if (ret)
|
|
goto error_free_dev;
|
|
|
|
if (client->irq > 0) {
|
|
ret = iio_register_interrupt_line(client->irq,
|
|
chip->indio_dev,
|
|
0,
|
|
IRQF_TRIGGER_LOW,
|
|
chip->name);
|
|
if (ret)
|
|
goto error_unreg_dev;
|
|
|
|
/*
|
|
* The event handler list element refer to iio_event_ad7291.
|
|
* All event attributes bind to the same event handler.
|
|
* So, only register event handler once.
|
|
*/
|
|
iio_add_event_to_list(&iio_event_ad7291,
|
|
&chip->indio_dev->interrupts[0]->ev_list);
|
|
|
|
INIT_WORK(&chip->thresh_work, ad7291_interrupt_bh);
|
|
|
|
/* set irq polarity low level */
|
|
chip->command |= AD7291_ALART_POLARITY;
|
|
}
|
|
|
|
ret = ad7291_i2c_write(chip, AD7291_COMMAND, chip->command);
|
|
if (ret) {
|
|
ret = -EIO;
|
|
goto error_unreg_irq;
|
|
}
|
|
|
|
dev_info(&client->dev, "%s temperature sensor registered.\n",
|
|
id->name);
|
|
|
|
return 0;
|
|
|
|
error_unreg_irq:
|
|
iio_unregister_interrupt_line(chip->indio_dev, 0);
|
|
error_unreg_dev:
|
|
iio_device_unregister(chip->indio_dev);
|
|
error_free_dev:
|
|
iio_free_device(chip->indio_dev);
|
|
error_free_chip:
|
|
kfree(chip);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit ad7291_remove(struct i2c_client *client)
|
|
{
|
|
struct ad7291_chip_info *chip = i2c_get_clientdata(client);
|
|
struct iio_dev *indio_dev = chip->indio_dev;
|
|
|
|
if (client->irq)
|
|
iio_unregister_interrupt_line(indio_dev, 0);
|
|
iio_device_unregister(indio_dev);
|
|
iio_free_device(chip->indio_dev);
|
|
kfree(chip);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id ad7291_id[] = {
|
|
{ "ad7291", 0 },
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, ad7291_id);
|
|
|
|
static struct i2c_driver ad7291_driver = {
|
|
.driver = {
|
|
.name = "ad7291",
|
|
},
|
|
.probe = ad7291_probe,
|
|
.remove = __devexit_p(ad7291_remove),
|
|
.id_table = ad7291_id,
|
|
};
|
|
|
|
static __init int ad7291_init(void)
|
|
{
|
|
return i2c_add_driver(&ad7291_driver);
|
|
}
|
|
|
|
static __exit void ad7291_exit(void)
|
|
{
|
|
i2c_del_driver(&ad7291_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
|
|
MODULE_DESCRIPTION("Analog Devices AD7291 digital"
|
|
" temperature sensor driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
module_init(ad7291_init);
|
|
module_exit(ad7291_exit);
|