924 lines
23 KiB
C
924 lines
23 KiB
C
/*
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* iio/adc/ad799x.c
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* Copyright (C) 2010 Michael Hennerich, Analog Devices Inc.
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*
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* based on iio/adc/max1363
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* Copyright (C) 2008-2010 Jonathan Cameron
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*
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* based on linux/drivers/i2c/chips/max123x
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* Copyright (C) 2002-2004 Stefan Eletzhofer
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*
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* based on linux/drivers/acron/char/pcf8583.c
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* Copyright (C) 2000 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* ad799x.c
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*
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* Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
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* ad7998 and similar chips.
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*
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*/
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#include <linux/interrupt.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/sysfs.h>
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#include <linux/list.h>
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#include <linux/i2c.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/err.h>
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#include "../iio.h"
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#include "../sysfs.h"
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#include "../ring_generic.h"
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#include "adc.h"
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#include "ad799x.h"
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/*
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* ad799x register access by I2C
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*/
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static int ad799x_i2c_read16(struct ad799x_state *st, u8 reg, u16 *data)
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{
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struct i2c_client *client = st->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 ad799x_i2c_read8(struct ad799x_state *st, u8 reg, u8 *data)
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{
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struct i2c_client *client = st->client;
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int ret = 0;
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ret = i2c_smbus_read_byte_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 = (u8)ret;
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return 0;
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}
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static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data)
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{
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struct i2c_client *client = st->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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static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data)
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{
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struct i2c_client *client = st->client;
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int ret = 0;
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ret = i2c_smbus_write_byte_data(client, reg, 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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static int ad799x_scan_el_set_state(struct iio_scan_el *scan_el,
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struct iio_dev *indio_dev,
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bool state)
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{
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struct ad799x_state *st = indio_dev->dev_data;
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return ad799x_set_scan_mode(st, st->indio_dev->ring->scan_mask);
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}
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/* Here we claim all are 16 bits. This currently does no harm and saves
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* us a lot of scan element listings */
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#define AD799X_SCAN_EL(number) \
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IIO_SCAN_EL_C(in##number, number, 0, ad799x_scan_el_set_state);
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static AD799X_SCAN_EL(0);
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static AD799X_SCAN_EL(1);
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static AD799X_SCAN_EL(2);
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static AD799X_SCAN_EL(3);
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static AD799X_SCAN_EL(4);
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static AD799X_SCAN_EL(5);
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static AD799X_SCAN_EL(6);
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static AD799X_SCAN_EL(7);
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static ssize_t ad799x_show_type(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_ring_buffer *ring = dev_get_drvdata(dev);
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struct iio_dev *indio_dev = ring->indio_dev;
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struct ad799x_state *st = indio_dev->dev_data;
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return sprintf(buf, "%c%d/%d\n", st->chip_info->sign,
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st->chip_info->bits, AD799X_STORAGEBITS);
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}
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static IIO_DEVICE_ATTR(in_type, S_IRUGO, ad799x_show_type, NULL, 0);
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static int ad7991_5_9_set_scan_mode(struct ad799x_state *st, unsigned mask)
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{
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return i2c_smbus_write_byte(st->client,
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st->config | (mask << AD799X_CHANNEL_SHIFT));
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}
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static int ad7992_3_4_set_scan_mode(struct ad799x_state *st, unsigned mask)
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{
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return ad799x_i2c_write8(st, AD7998_CONF_REG,
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st->config | (mask << AD799X_CHANNEL_SHIFT));
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}
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static int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask)
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{
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return ad799x_i2c_write16(st, AD7998_CONF_REG,
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st->config | (mask << AD799X_CHANNEL_SHIFT));
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}
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int ad799x_set_scan_mode(struct ad799x_state *st, unsigned mask)
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{
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int ret;
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if (st->chip_info->ad799x_set_scan_mode != NULL) {
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ret = st->chip_info->ad799x_set_scan_mode(st, mask);
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return (ret > 0) ? 0 : ret;
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}
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return 0;
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}
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static ssize_t ad799x_read_single_channel(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 ad799x_state *st = iio_dev_get_devdata(dev_info);
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struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
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int ret = 0, len = 0;
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u32 data ;
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u16 rxbuf[1];
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u8 cmd;
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long mask;
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mutex_lock(&dev_info->mlock);
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mask = 1 << this_attr->address;
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/* If ring buffer capture is occuring, query the buffer */
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if (iio_ring_enabled(dev_info)) {
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data = ret = ad799x_single_channel_from_ring(st, mask);
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if (ret < 0)
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goto error_ret;
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ret = 0;
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} else {
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switch (st->id) {
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case ad7991:
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case ad7995:
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case ad7999:
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cmd = st->config | (mask << AD799X_CHANNEL_SHIFT);
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break;
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case ad7992:
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case ad7993:
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case ad7994:
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cmd = mask << AD799X_CHANNEL_SHIFT;
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break;
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case ad7997:
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case ad7998:
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cmd = (this_attr->address <<
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AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
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break;
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default:
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cmd = 0;
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}
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ret = ad799x_i2c_read16(st, cmd, rxbuf);
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if (ret < 0)
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goto error_ret;
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data = rxbuf[0];
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}
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/* Pretty print the result */
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len = sprintf(buf, "%u\n", data & ((1 << (st->chip_info->bits)) - 1));
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error_ret:
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mutex_unlock(&dev_info->mlock);
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return ret ? ret : len;
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}
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static ssize_t ad799x_read_frequency(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 ad799x_state *st = iio_dev_get_devdata(dev_info);
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int ret, len = 0;
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u8 val;
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ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
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if (ret)
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return ret;
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val &= AD7998_CYC_MASK;
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switch (val) {
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case AD7998_CYC_DIS:
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len = sprintf(buf, "0\n");
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break;
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case AD7998_CYC_TCONF_32:
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len = sprintf(buf, "15625\n");
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break;
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case AD7998_CYC_TCONF_64:
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len = sprintf(buf, "7812\n");
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break;
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case AD7998_CYC_TCONF_128:
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len = sprintf(buf, "3906\n");
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break;
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case AD7998_CYC_TCONF_256:
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len = sprintf(buf, "1953\n");
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break;
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case AD7998_CYC_TCONF_512:
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len = sprintf(buf, "976\n");
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break;
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case AD7998_CYC_TCONF_1024:
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len = sprintf(buf, "488\n");
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break;
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case AD7998_CYC_TCONF_2048:
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len = sprintf(buf, "244\n");
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break;
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}
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return len;
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}
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static ssize_t ad799x_write_frequency(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 ad799x_state *st = iio_dev_get_devdata(dev_info);
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long val;
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int ret;
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u8 t;
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ret = strict_strtol(buf, 10, &val);
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if (ret)
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return ret;
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mutex_lock(&dev_info->mlock);
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ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
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if (ret)
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goto error_ret_mutex;
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/* Wipe the bits clean */
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t &= ~AD7998_CYC_MASK;
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switch (val) {
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case 15625:
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t |= AD7998_CYC_TCONF_32;
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break;
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case 7812:
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t |= AD7998_CYC_TCONF_64;
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break;
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case 3906:
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t |= AD7998_CYC_TCONF_128;
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break;
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case 1953:
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t |= AD7998_CYC_TCONF_256;
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break;
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case 976:
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t |= AD7998_CYC_TCONF_512;
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break;
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case 488:
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t |= AD7998_CYC_TCONF_1024;
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break;
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case 244:
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t |= AD7998_CYC_TCONF_2048;
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break;
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case 0:
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t |= AD7998_CYC_DIS;
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break;
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default:
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ret = -EINVAL;
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goto error_ret_mutex;
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}
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ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
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error_ret_mutex:
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mutex_unlock(&dev_info->mlock);
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return ret ? ret : len;
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}
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static ssize_t ad799x_read_channel_config(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 ad799x_state *st = iio_dev_get_devdata(dev_info);
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struct iio_event_attr *this_attr = to_iio_event_attr(attr);
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int ret;
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u16 val;
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ret = ad799x_i2c_read16(st, this_attr->mask, &val);
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if (ret)
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return ret;
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return sprintf(buf, "%d\n", val);
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}
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static ssize_t ad799x_write_channel_config(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 ad799x_state *st = iio_dev_get_devdata(dev_info);
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struct iio_event_attr *this_attr = to_iio_event_attr(attr);
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long val;
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int ret;
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ret = strict_strtol(buf, 10, &val);
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if (ret)
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return ret;
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mutex_lock(&dev_info->mlock);
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ret = ad799x_i2c_write16(st, this_attr->mask, val);
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mutex_unlock(&dev_info->mlock);
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return ret ? ret : len;
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}
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static void ad799x_interrupt_bh(struct work_struct *work_s)
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{
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struct ad799x_state *st = container_of(work_s,
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struct ad799x_state, work_thresh);
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u8 status;
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int i;
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if (ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status))
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goto err_out;
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if (!status)
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goto err_out;
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ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
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for (i = 0; i < 8; i++) {
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if (status & (1 << i))
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iio_push_event(st->indio_dev, 0,
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i & 0x1 ?
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IIO_EVENT_CODE_IN_HIGH_THRESH(i >> 1) :
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IIO_EVENT_CODE_IN_LOW_THRESH(i >> 1),
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st->last_timestamp);
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}
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err_out:
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enable_irq(st->client->irq);
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}
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static int ad799x_interrupt(struct iio_dev *dev_info,
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int index,
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s64 timestamp,
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int no_test)
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{
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struct ad799x_state *st = dev_info->dev_data;
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st->last_timestamp = timestamp;
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schedule_work(&st->work_thresh);
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return 0;
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}
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IIO_EVENT_SH(ad799x, &ad799x_interrupt);
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/* Direct read attribtues */
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static IIO_DEV_ATTR_IN_RAW(0, ad799x_read_single_channel, 0);
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static IIO_DEV_ATTR_IN_RAW(1, ad799x_read_single_channel, 1);
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static IIO_DEV_ATTR_IN_RAW(2, ad799x_read_single_channel, 2);
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static IIO_DEV_ATTR_IN_RAW(3, ad799x_read_single_channel, 3);
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static IIO_DEV_ATTR_IN_RAW(4, ad799x_read_single_channel, 4);
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static IIO_DEV_ATTR_IN_RAW(5, ad799x_read_single_channel, 5);
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static IIO_DEV_ATTR_IN_RAW(6, ad799x_read_single_channel, 6);
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static IIO_DEV_ATTR_IN_RAW(7, ad799x_read_single_channel, 7);
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static ssize_t ad799x_show_scale(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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/* Driver currently only support internal vref */
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad799x_state *st = iio_dev_get_devdata(dev_info);
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/* Corresponds to Vref / 2^(bits) */
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unsigned int scale_uv = (st->int_vref_mv * 1000) >> st->chip_info->bits;
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return sprintf(buf, "%d.%03d\n", scale_uv / 1000, scale_uv % 1000);
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}
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static IIO_DEVICE_ATTR(in_scale, S_IRUGO, ad799x_show_scale, NULL, 0);
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static ssize_t ad799x_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 ad799x_state *st = iio_dev_get_devdata(dev_info);
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return sprintf(buf, "%s\n", st->client->name);
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}
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static IIO_DEVICE_ATTR(name, S_IRUGO, ad799x_show_name, NULL, 0);
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static struct attribute *ad7991_5_9_3_4_device_attrs[] = {
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&iio_dev_attr_in0_raw.dev_attr.attr,
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&iio_dev_attr_in1_raw.dev_attr.attr,
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&iio_dev_attr_in2_raw.dev_attr.attr,
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&iio_dev_attr_in3_raw.dev_attr.attr,
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&iio_dev_attr_name.dev_attr.attr,
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&iio_dev_attr_in_scale.dev_attr.attr,
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NULL
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};
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static struct attribute_group ad7991_5_9_3_4_dev_attr_group = {
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.attrs = ad7991_5_9_3_4_device_attrs,
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};
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static struct attribute *ad7991_5_9_3_4_scan_el_attrs[] = {
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&iio_scan_el_in0.dev_attr.attr,
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&iio_const_attr_in0_index.dev_attr.attr,
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&iio_scan_el_in1.dev_attr.attr,
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&iio_const_attr_in1_index.dev_attr.attr,
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&iio_scan_el_in2.dev_attr.attr,
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&iio_const_attr_in2_index.dev_attr.attr,
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&iio_scan_el_in3.dev_attr.attr,
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&iio_const_attr_in3_index.dev_attr.attr,
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&iio_dev_attr_in_type.dev_attr.attr,
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NULL,
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};
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static struct attribute_group ad7991_5_9_3_4_scan_el_group = {
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.name = "scan_elements",
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.attrs = ad7991_5_9_3_4_scan_el_attrs,
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};
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static struct attribute *ad7992_device_attrs[] = {
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&iio_dev_attr_in0_raw.dev_attr.attr,
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&iio_dev_attr_in1_raw.dev_attr.attr,
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&iio_dev_attr_name.dev_attr.attr,
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|
&iio_dev_attr_in_scale.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group ad7992_dev_attr_group = {
|
|
.attrs = ad7992_device_attrs,
|
|
};
|
|
|
|
static struct attribute *ad7992_scan_el_attrs[] = {
|
|
&iio_scan_el_in0.dev_attr.attr,
|
|
&iio_const_attr_in0_index.dev_attr.attr,
|
|
&iio_scan_el_in1.dev_attr.attr,
|
|
&iio_const_attr_in1_index.dev_attr.attr,
|
|
&iio_dev_attr_in_type.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group ad7992_scan_el_group = {
|
|
.name = "scan_elements",
|
|
.attrs = ad7992_scan_el_attrs,
|
|
};
|
|
|
|
static struct attribute *ad7997_8_device_attrs[] = {
|
|
&iio_dev_attr_in0_raw.dev_attr.attr,
|
|
&iio_dev_attr_in1_raw.dev_attr.attr,
|
|
&iio_dev_attr_in2_raw.dev_attr.attr,
|
|
&iio_dev_attr_in3_raw.dev_attr.attr,
|
|
&iio_dev_attr_in4_raw.dev_attr.attr,
|
|
&iio_dev_attr_in5_raw.dev_attr.attr,
|
|
&iio_dev_attr_in6_raw.dev_attr.attr,
|
|
&iio_dev_attr_in7_raw.dev_attr.attr,
|
|
&iio_dev_attr_name.dev_attr.attr,
|
|
&iio_dev_attr_in_scale.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group ad7997_8_dev_attr_group = {
|
|
.attrs = ad7997_8_device_attrs,
|
|
};
|
|
|
|
static struct attribute *ad7997_8_scan_el_attrs[] = {
|
|
&iio_scan_el_in0.dev_attr.attr,
|
|
&iio_const_attr_in0_index.dev_attr.attr,
|
|
&iio_scan_el_in1.dev_attr.attr,
|
|
&iio_const_attr_in1_index.dev_attr.attr,
|
|
&iio_scan_el_in2.dev_attr.attr,
|
|
&iio_const_attr_in2_index.dev_attr.attr,
|
|
&iio_scan_el_in3.dev_attr.attr,
|
|
&iio_const_attr_in3_index.dev_attr.attr,
|
|
&iio_scan_el_in4.dev_attr.attr,
|
|
&iio_const_attr_in4_index.dev_attr.attr,
|
|
&iio_scan_el_in5.dev_attr.attr,
|
|
&iio_const_attr_in5_index.dev_attr.attr,
|
|
&iio_scan_el_in6.dev_attr.attr,
|
|
&iio_const_attr_in6_index.dev_attr.attr,
|
|
&iio_scan_el_in7.dev_attr.attr,
|
|
&iio_const_attr_in7_index.dev_attr.attr,
|
|
&iio_dev_attr_in_type.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group ad7997_8_scan_el_group = {
|
|
.name = "scan_elements",
|
|
.attrs = ad7997_8_scan_el_attrs,
|
|
};
|
|
|
|
IIO_EVENT_ATTR_SH(in0_thresh_low_value,
|
|
iio_event_ad799x,
|
|
ad799x_read_channel_config,
|
|
ad799x_write_channel_config,
|
|
AD7998_DATALOW_CH1_REG);
|
|
|
|
IIO_EVENT_ATTR_SH(in0_thresh_high_value,
|
|
iio_event_ad799x,
|
|
ad799x_read_channel_config,
|
|
ad799x_write_channel_config,
|
|
AD7998_DATAHIGH_CH1_REG);
|
|
|
|
IIO_EVENT_ATTR_SH(in0_thresh_both_hyst_raw,
|
|
iio_event_ad799x,
|
|
ad799x_read_channel_config,
|
|
ad799x_write_channel_config,
|
|
AD7998_HYST_CH1_REG);
|
|
|
|
IIO_EVENT_ATTR_SH(in1_thresh_low_value,
|
|
iio_event_ad799x,
|
|
ad799x_read_channel_config,
|
|
ad799x_write_channel_config,
|
|
AD7998_DATALOW_CH2_REG);
|
|
|
|
IIO_EVENT_ATTR_SH(in1_thresh_high_value,
|
|
iio_event_ad799x,
|
|
ad799x_read_channel_config,
|
|
ad799x_write_channel_config,
|
|
AD7998_DATAHIGH_CH2_REG);
|
|
|
|
IIO_EVENT_ATTR_SH(in1_thresh_both_hyst_raw,
|
|
iio_event_ad799x,
|
|
ad799x_read_channel_config,
|
|
ad799x_write_channel_config,
|
|
AD7998_HYST_CH2_REG);
|
|
|
|
IIO_EVENT_ATTR_SH(in2_thresh_low_value,
|
|
iio_event_ad799x,
|
|
ad799x_read_channel_config,
|
|
ad799x_write_channel_config,
|
|
AD7998_DATALOW_CH3_REG);
|
|
|
|
IIO_EVENT_ATTR_SH(in2_thresh_high_value,
|
|
iio_event_ad799x,
|
|
ad799x_read_channel_config,
|
|
ad799x_write_channel_config,
|
|
AD7998_DATAHIGH_CH3_REG);
|
|
|
|
IIO_EVENT_ATTR_SH(in2_thresh_both_hyst_raw,
|
|
iio_event_ad799x,
|
|
ad799x_read_channel_config,
|
|
ad799x_write_channel_config,
|
|
AD7998_HYST_CH3_REG);
|
|
|
|
IIO_EVENT_ATTR_SH(in3_thresh_low_value,
|
|
iio_event_ad799x,
|
|
ad799x_read_channel_config,
|
|
ad799x_write_channel_config,
|
|
AD7998_DATALOW_CH4_REG);
|
|
|
|
IIO_EVENT_ATTR_SH(in3_thresh_high_value,
|
|
iio_event_ad799x,
|
|
ad799x_read_channel_config,
|
|
ad799x_write_channel_config,
|
|
AD7998_DATAHIGH_CH4_REG);
|
|
|
|
IIO_EVENT_ATTR_SH(in3_thresh_both_hyst_raw,
|
|
iio_event_ad799x,
|
|
ad799x_read_channel_config,
|
|
ad799x_write_channel_config,
|
|
AD7998_HYST_CH4_REG);
|
|
|
|
static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
|
|
ad799x_read_frequency,
|
|
ad799x_write_frequency);
|
|
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
|
|
|
|
static struct attribute *ad7993_4_7_8_event_attributes[] = {
|
|
&iio_event_attr_in0_thresh_low_value.dev_attr.attr,
|
|
&iio_event_attr_in0_thresh_high_value.dev_attr.attr,
|
|
&iio_event_attr_in0_thresh_both_hyst_raw.dev_attr.attr,
|
|
&iio_event_attr_in1_thresh_low_value.dev_attr.attr,
|
|
&iio_event_attr_in1_thresh_high_value.dev_attr.attr,
|
|
&iio_event_attr_in1_thresh_both_hyst_raw.dev_attr.attr,
|
|
&iio_event_attr_in2_thresh_low_value.dev_attr.attr,
|
|
&iio_event_attr_in2_thresh_high_value.dev_attr.attr,
|
|
&iio_event_attr_in2_thresh_both_hyst_raw.dev_attr.attr,
|
|
&iio_event_attr_in3_thresh_low_value.dev_attr.attr,
|
|
&iio_event_attr_in3_thresh_high_value.dev_attr.attr,
|
|
&iio_event_attr_in3_thresh_both_hyst_raw.dev_attr.attr,
|
|
&iio_dev_attr_sampling_frequency.dev_attr.attr,
|
|
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group ad7993_4_7_8_event_attrs_group = {
|
|
.attrs = ad7993_4_7_8_event_attributes,
|
|
};
|
|
|
|
static struct attribute *ad7992_event_attributes[] = {
|
|
&iio_event_attr_in0_thresh_low_value.dev_attr.attr,
|
|
&iio_event_attr_in0_thresh_high_value.dev_attr.attr,
|
|
&iio_event_attr_in0_thresh_both_hyst_raw.dev_attr.attr,
|
|
&iio_event_attr_in1_thresh_low_value.dev_attr.attr,
|
|
&iio_event_attr_in1_thresh_high_value.dev_attr.attr,
|
|
&iio_event_attr_in1_thresh_both_hyst_raw.dev_attr.attr,
|
|
&iio_dev_attr_sampling_frequency.dev_attr.attr,
|
|
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group ad7992_event_attrs_group = {
|
|
.attrs = ad7992_event_attributes,
|
|
};
|
|
|
|
static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
|
|
[ad7991] = {
|
|
.num_inputs = 4,
|
|
.bits = 12,
|
|
.sign = IIO_SCAN_EL_TYPE_UNSIGNED,
|
|
.int_vref_mv = 4096,
|
|
.dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
|
|
.scan_attrs = &ad7991_5_9_3_4_scan_el_group,
|
|
.ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
|
|
},
|
|
[ad7995] = {
|
|
.num_inputs = 4,
|
|
.bits = 10,
|
|
.sign = IIO_SCAN_EL_TYPE_UNSIGNED,
|
|
.int_vref_mv = 1024,
|
|
.dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
|
|
.scan_attrs = &ad7991_5_9_3_4_scan_el_group,
|
|
.ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
|
|
},
|
|
[ad7999] = {
|
|
.num_inputs = 4,
|
|
.bits = 10,
|
|
.sign = IIO_SCAN_EL_TYPE_UNSIGNED,
|
|
.int_vref_mv = 1024,
|
|
.dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
|
|
.scan_attrs = &ad7991_5_9_3_4_scan_el_group,
|
|
.ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
|
|
},
|
|
[ad7992] = {
|
|
.num_inputs = 2,
|
|
.bits = 12,
|
|
.sign = IIO_SCAN_EL_TYPE_UNSIGNED,
|
|
.int_vref_mv = 4096,
|
|
.monitor_mode = true,
|
|
.default_config = AD7998_ALERT_EN,
|
|
.dev_attrs = &ad7992_dev_attr_group,
|
|
.scan_attrs = &ad7992_scan_el_group,
|
|
.event_attrs = &ad7992_event_attrs_group,
|
|
.ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
|
|
},
|
|
[ad7993] = {
|
|
.num_inputs = 4,
|
|
.bits = 10,
|
|
.sign = IIO_SCAN_EL_TYPE_UNSIGNED,
|
|
.int_vref_mv = 1024,
|
|
.monitor_mode = true,
|
|
.default_config = AD7998_ALERT_EN,
|
|
.dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
|
|
.scan_attrs = &ad7991_5_9_3_4_scan_el_group,
|
|
.event_attrs = &ad7993_4_7_8_event_attrs_group,
|
|
.ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
|
|
},
|
|
[ad7994] = {
|
|
.num_inputs = 4,
|
|
.bits = 12,
|
|
.sign = IIO_SCAN_EL_TYPE_UNSIGNED,
|
|
.int_vref_mv = 4096,
|
|
.monitor_mode = true,
|
|
.default_config = AD7998_ALERT_EN,
|
|
.dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
|
|
.scan_attrs = &ad7991_5_9_3_4_scan_el_group,
|
|
.event_attrs = &ad7993_4_7_8_event_attrs_group,
|
|
.ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
|
|
},
|
|
[ad7997] = {
|
|
.num_inputs = 8,
|
|
.bits = 10,
|
|
.sign = IIO_SCAN_EL_TYPE_UNSIGNED,
|
|
.int_vref_mv = 1024,
|
|
.monitor_mode = true,
|
|
.default_config = AD7998_ALERT_EN,
|
|
.dev_attrs = &ad7997_8_dev_attr_group,
|
|
.scan_attrs = &ad7997_8_scan_el_group,
|
|
.event_attrs = &ad7993_4_7_8_event_attrs_group,
|
|
.ad799x_set_scan_mode = ad7997_8_set_scan_mode,
|
|
},
|
|
[ad7998] = {
|
|
.num_inputs = 8,
|
|
.bits = 12,
|
|
.sign = IIO_SCAN_EL_TYPE_UNSIGNED,
|
|
.int_vref_mv = 4096,
|
|
.monitor_mode = true,
|
|
.default_config = AD7998_ALERT_EN,
|
|
.dev_attrs = &ad7997_8_dev_attr_group,
|
|
.scan_attrs = &ad7997_8_scan_el_group,
|
|
.event_attrs = &ad7993_4_7_8_event_attrs_group,
|
|
.ad799x_set_scan_mode = ad7997_8_set_scan_mode,
|
|
},
|
|
};
|
|
|
|
static int __devinit ad799x_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
int ret, regdone = 0;
|
|
struct ad799x_platform_data *pdata = client->dev.platform_data;
|
|
struct ad799x_state *st = kzalloc(sizeof(*st), GFP_KERNEL);
|
|
if (st == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
|
|
/* this is only used for device removal purposes */
|
|
i2c_set_clientdata(client, st);
|
|
|
|
atomic_set(&st->protect_ring, 0);
|
|
st->id = id->driver_data;
|
|
st->chip_info = &ad799x_chip_info_tbl[st->id];
|
|
st->config = st->chip_info->default_config;
|
|
|
|
/* TODO: Add pdata options for filtering and bit delay */
|
|
|
|
if (pdata)
|
|
st->int_vref_mv = pdata->vref_mv;
|
|
else
|
|
st->int_vref_mv = st->chip_info->int_vref_mv;
|
|
|
|
st->reg = regulator_get(&client->dev, "vcc");
|
|
if (!IS_ERR(st->reg)) {
|
|
ret = regulator_enable(st->reg);
|
|
if (ret)
|
|
goto error_put_reg;
|
|
}
|
|
st->client = client;
|
|
|
|
st->indio_dev = iio_allocate_device();
|
|
if (st->indio_dev == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_disable_reg;
|
|
}
|
|
|
|
/* Estabilish that the iio_dev is a child of the i2c device */
|
|
st->indio_dev->dev.parent = &client->dev;
|
|
st->indio_dev->attrs = st->chip_info->dev_attrs;
|
|
st->indio_dev->event_attrs = st->chip_info->event_attrs;
|
|
|
|
st->indio_dev->dev_data = (void *)(st);
|
|
st->indio_dev->driver_module = THIS_MODULE;
|
|
st->indio_dev->modes = INDIO_DIRECT_MODE;
|
|
st->indio_dev->num_interrupt_lines = 1;
|
|
|
|
ret = ad799x_set_scan_mode(st, 0);
|
|
if (ret)
|
|
goto error_free_device;
|
|
|
|
ret = ad799x_register_ring_funcs_and_init(st->indio_dev);
|
|
if (ret)
|
|
goto error_free_device;
|
|
|
|
ret = iio_device_register(st->indio_dev);
|
|
if (ret)
|
|
goto error_cleanup_ring;
|
|
regdone = 1;
|
|
|
|
ret = iio_ring_buffer_register(st->indio_dev->ring, 0);
|
|
if (ret)
|
|
goto error_cleanup_ring;
|
|
|
|
if (client->irq > 0 && st->chip_info->monitor_mode) {
|
|
INIT_WORK(&st->work_thresh, ad799x_interrupt_bh);
|
|
|
|
ret = iio_register_interrupt_line(client->irq,
|
|
st->indio_dev,
|
|
0,
|
|
IRQF_TRIGGER_FALLING,
|
|
client->name);
|
|
if (ret)
|
|
goto error_cleanup_ring;
|
|
|
|
/*
|
|
* The event handler list element refer to iio_event_ad799x.
|
|
* All event attributes bind to the same event handler.
|
|
* So, only register event handler once.
|
|
*/
|
|
iio_add_event_to_list(&iio_event_ad799x,
|
|
&st->indio_dev->interrupts[0]->ev_list);
|
|
}
|
|
|
|
return 0;
|
|
error_cleanup_ring:
|
|
ad799x_ring_cleanup(st->indio_dev);
|
|
error_free_device:
|
|
if (!regdone)
|
|
iio_free_device(st->indio_dev);
|
|
else
|
|
iio_device_unregister(st->indio_dev);
|
|
error_disable_reg:
|
|
if (!IS_ERR(st->reg))
|
|
regulator_disable(st->reg);
|
|
error_put_reg:
|
|
if (!IS_ERR(st->reg))
|
|
regulator_put(st->reg);
|
|
kfree(st);
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static __devexit int ad799x_remove(struct i2c_client *client)
|
|
{
|
|
struct ad799x_state *st = i2c_get_clientdata(client);
|
|
struct iio_dev *indio_dev = st->indio_dev;
|
|
|
|
if (client->irq > 0 && st->chip_info->monitor_mode)
|
|
iio_unregister_interrupt_line(indio_dev, 0);
|
|
|
|
iio_ring_buffer_unregister(indio_dev->ring);
|
|
ad799x_ring_cleanup(indio_dev);
|
|
iio_device_unregister(indio_dev);
|
|
if (!IS_ERR(st->reg)) {
|
|
regulator_disable(st->reg);
|
|
regulator_put(st->reg);
|
|
}
|
|
kfree(st);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id ad799x_id[] = {
|
|
{ "ad7991", ad7991 },
|
|
{ "ad7995", ad7995 },
|
|
{ "ad7999", ad7999 },
|
|
{ "ad7992", ad7992 },
|
|
{ "ad7993", ad7993 },
|
|
{ "ad7994", ad7994 },
|
|
{ "ad7997", ad7997 },
|
|
{ "ad7998", ad7998 },
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, ad799x_id);
|
|
|
|
static struct i2c_driver ad799x_driver = {
|
|
.driver = {
|
|
.name = "ad799x",
|
|
},
|
|
.probe = ad799x_probe,
|
|
.remove = __devexit_p(ad799x_remove),
|
|
.id_table = ad799x_id,
|
|
};
|
|
|
|
static __init int ad799x_init(void)
|
|
{
|
|
return i2c_add_driver(&ad799x_driver);
|
|
}
|
|
|
|
static __exit void ad799x_exit(void)
|
|
{
|
|
i2c_del_driver(&ad799x_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
|
|
MODULE_DESCRIPTION("Analog Devices AD799x ADC");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("i2c:ad799x");
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module_init(ad799x_init);
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module_exit(ad799x_exit);
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