901 строка
21 KiB
C
901 строка
21 KiB
C
/*
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* iio/adc/ad799x.c
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* Copyright (C) 2010-2011 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/device.h>
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#include <linux/kernel.h>
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#include <linux/sysfs.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 <linux/module.h>
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#include <linux/bitops.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/events.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#define AD799X_CHANNEL_SHIFT 4
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/*
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* AD7991, AD7995 and AD7999 defines
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*/
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#define AD7991_REF_SEL 0x08
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#define AD7991_FLTR 0x04
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#define AD7991_BIT_TRIAL_DELAY 0x02
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#define AD7991_SAMPLE_DELAY 0x01
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/*
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* AD7992, AD7993, AD7994, AD7997 and AD7998 defines
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*/
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#define AD7998_FLTR BIT(3)
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#define AD7998_ALERT_EN BIT(2)
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#define AD7998_BUSY_ALERT BIT(1)
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#define AD7998_BUSY_ALERT_POL BIT(0)
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#define AD7998_CONV_RES_REG 0x0
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#define AD7998_ALERT_STAT_REG 0x1
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#define AD7998_CONF_REG 0x2
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#define AD7998_CYCLE_TMR_REG 0x3
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#define AD7998_DATALOW_REG(x) ((x) * 3 + 0x4)
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#define AD7998_DATAHIGH_REG(x) ((x) * 3 + 0x5)
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#define AD7998_HYST_REG(x) ((x) * 3 + 0x6)
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#define AD7998_CYC_MASK GENMASK(2, 0)
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#define AD7998_CYC_DIS 0x0
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#define AD7998_CYC_TCONF_32 0x1
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#define AD7998_CYC_TCONF_64 0x2
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#define AD7998_CYC_TCONF_128 0x3
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#define AD7998_CYC_TCONF_256 0x4
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#define AD7998_CYC_TCONF_512 0x5
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#define AD7998_CYC_TCONF_1024 0x6
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#define AD7998_CYC_TCONF_2048 0x7
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#define AD7998_ALERT_STAT_CLEAR 0xFF
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/*
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* AD7997 and AD7997 defines
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*/
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#define AD7997_8_READ_SINGLE BIT(7)
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#define AD7997_8_READ_SEQUENCE (BIT(6) | BIT(5) | BIT(4))
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enum {
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ad7991,
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ad7995,
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ad7999,
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ad7992,
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ad7993,
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ad7994,
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ad7997,
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ad7998
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};
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/**
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* struct ad799x_chip_config - chip specific information
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* @channel: channel specification
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* @default_config: device default configuration
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* @info: pointer to iio_info struct
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*/
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struct ad799x_chip_config {
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const struct iio_chan_spec channel[9];
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u16 default_config;
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const struct iio_info *info;
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};
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/**
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* struct ad799x_chip_info - chip specific information
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* @num_channels: number of channels
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* @noirq_config: device configuration w/o IRQ
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* @irq_config: device configuration w/IRQ
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*/
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struct ad799x_chip_info {
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int num_channels;
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const struct ad799x_chip_config noirq_config;
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const struct ad799x_chip_config irq_config;
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};
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struct ad799x_state {
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struct i2c_client *client;
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const struct ad799x_chip_config *chip_config;
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struct regulator *reg;
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struct regulator *vref;
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unsigned id;
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u16 config;
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u8 *rx_buf;
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unsigned int transfer_size;
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};
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static int ad799x_write_config(struct ad799x_state *st, u16 val)
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{
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switch (st->id) {
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case ad7997:
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case ad7998:
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return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG,
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val);
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case ad7992:
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case ad7993:
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case ad7994:
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return i2c_smbus_write_byte_data(st->client, AD7998_CONF_REG,
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val);
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default:
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/* Will be written when doing a conversion */
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st->config = val;
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return 0;
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}
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}
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static int ad799x_read_config(struct ad799x_state *st)
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{
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switch (st->id) {
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case ad7997:
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case ad7998:
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return i2c_smbus_read_word_swapped(st->client, AD7998_CONF_REG);
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case ad7992:
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case ad7993:
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case ad7994:
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return i2c_smbus_read_byte_data(st->client, AD7998_CONF_REG);
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default:
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/* No readback support */
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return st->config;
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}
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}
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/**
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* ad799x_trigger_handler() bh of trigger launched polling to ring buffer
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*
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* Currently there is no option in this driver to disable the saving of
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* timestamps within the ring.
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**/
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static irqreturn_t ad799x_trigger_handler(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct ad799x_state *st = iio_priv(indio_dev);
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int b_sent;
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u8 cmd;
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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 |
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(*indio_dev->active_scan_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 = (*indio_dev->active_scan_mask << AD799X_CHANNEL_SHIFT) |
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AD7998_CONV_RES_REG;
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break;
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case ad7997:
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case ad7998:
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cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
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break;
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default:
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cmd = 0;
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}
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b_sent = i2c_smbus_read_i2c_block_data(st->client,
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cmd, st->transfer_size, st->rx_buf);
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if (b_sent < 0)
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goto out;
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iio_push_to_buffers_with_timestamp(indio_dev, st->rx_buf,
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iio_get_time_ns(indio_dev));
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out:
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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}
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static int ad799x_update_scan_mode(struct iio_dev *indio_dev,
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const unsigned long *scan_mask)
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{
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struct ad799x_state *st = iio_priv(indio_dev);
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kfree(st->rx_buf);
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st->rx_buf = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
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if (!st->rx_buf)
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return -ENOMEM;
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st->transfer_size = bitmap_weight(scan_mask, indio_dev->masklength) * 2;
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switch (st->id) {
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case ad7992:
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case ad7993:
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case ad7994:
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case ad7997:
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case ad7998:
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st->config &= ~(GENMASK(7, 0) << AD799X_CHANNEL_SHIFT);
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st->config |= (*scan_mask << AD799X_CHANNEL_SHIFT);
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return ad799x_write_config(st, st->config);
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default:
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return 0;
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}
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}
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static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
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{
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u8 cmd;
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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 | (BIT(ch) << 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 = BIT(ch) << 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 = (ch << AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
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break;
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default:
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return -EINVAL;
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}
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return i2c_smbus_read_word_swapped(st->client, cmd);
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}
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static int ad799x_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val,
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int *val2,
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long m)
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{
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int ret;
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struct ad799x_state *st = iio_priv(indio_dev);
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switch (m) {
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case IIO_CHAN_INFO_RAW:
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ret = iio_device_claim_direct_mode(indio_dev);
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if (ret)
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return ret;
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ret = ad799x_scan_direct(st, chan->scan_index);
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iio_device_release_direct_mode(indio_dev);
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if (ret < 0)
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return ret;
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*val = (ret >> chan->scan_type.shift) &
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GENMASK(chan->scan_type.realbits - 1, 0);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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ret = regulator_get_voltage(st->vref);
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if (ret < 0)
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return ret;
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*val = ret / 1000;
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*val2 = chan->scan_type.realbits;
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return IIO_VAL_FRACTIONAL_LOG2;
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}
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return -EINVAL;
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}
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static const unsigned int ad7998_frequencies[] = {
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[AD7998_CYC_DIS] = 0,
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[AD7998_CYC_TCONF_32] = 15625,
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[AD7998_CYC_TCONF_64] = 7812,
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[AD7998_CYC_TCONF_128] = 3906,
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[AD7998_CYC_TCONF_512] = 976,
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[AD7998_CYC_TCONF_1024] = 488,
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[AD7998_CYC_TCONF_2048] = 244,
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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 *indio_dev = dev_to_iio_dev(dev);
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struct ad799x_state *st = iio_priv(indio_dev);
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int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
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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 *indio_dev = dev_to_iio_dev(dev);
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struct ad799x_state *st = iio_priv(indio_dev);
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long val;
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int ret, i;
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ret = kstrtol(buf, 10, &val);
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if (ret)
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return ret;
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mutex_lock(&indio_dev->mlock);
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ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
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if (ret < 0)
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goto error_ret_mutex;
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/* Wipe the bits clean */
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ret &= ~AD7998_CYC_MASK;
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for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
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if (val == ad7998_frequencies[i])
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break;
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if (i == ARRAY_SIZE(ad7998_frequencies)) {
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ret = -EINVAL;
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goto error_ret_mutex;
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}
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ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
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ret | i);
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if (ret < 0)
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goto error_ret_mutex;
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ret = len;
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error_ret_mutex:
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mutex_unlock(&indio_dev->mlock);
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return ret;
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}
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static int ad799x_read_event_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir)
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{
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struct ad799x_state *st = iio_priv(indio_dev);
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if (!(st->config & AD7998_ALERT_EN))
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return 0;
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if ((st->config >> AD799X_CHANNEL_SHIFT) & BIT(chan->scan_index))
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return 1;
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return 0;
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}
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static int ad799x_write_event_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir,
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int state)
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{
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struct ad799x_state *st = iio_priv(indio_dev);
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int ret;
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ret = iio_device_claim_direct_mode(indio_dev);
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if (ret)
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return ret;
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if (state)
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st->config |= BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT;
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else
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st->config &= ~(BIT(chan->scan_index) << AD799X_CHANNEL_SHIFT);
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if (st->config >> AD799X_CHANNEL_SHIFT)
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st->config |= AD7998_ALERT_EN;
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else
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st->config &= ~AD7998_ALERT_EN;
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ret = ad799x_write_config(st, st->config);
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iio_device_release_direct_mode(indio_dev);
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return ret;
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}
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static unsigned int ad799x_threshold_reg(const struct iio_chan_spec *chan,
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enum iio_event_direction dir,
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enum iio_event_info info)
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{
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switch (info) {
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case IIO_EV_INFO_VALUE:
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if (dir == IIO_EV_DIR_FALLING)
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return AD7998_DATALOW_REG(chan->channel);
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else
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return AD7998_DATAHIGH_REG(chan->channel);
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case IIO_EV_INFO_HYSTERESIS:
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return AD7998_HYST_REG(chan->channel);
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int ad799x_write_event_value(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir,
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enum iio_event_info info,
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int val, int val2)
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{
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int ret;
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struct ad799x_state *st = iio_priv(indio_dev);
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if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
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return -EINVAL;
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mutex_lock(&indio_dev->mlock);
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ret = i2c_smbus_write_word_swapped(st->client,
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ad799x_threshold_reg(chan, dir, info),
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val << chan->scan_type.shift);
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mutex_unlock(&indio_dev->mlock);
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return ret;
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}
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static int ad799x_read_event_value(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir,
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enum iio_event_info info,
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int *val, int *val2)
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{
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int ret;
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struct ad799x_state *st = iio_priv(indio_dev);
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mutex_lock(&indio_dev->mlock);
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ret = i2c_smbus_read_word_swapped(st->client,
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ad799x_threshold_reg(chan, dir, info));
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mutex_unlock(&indio_dev->mlock);
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if (ret < 0)
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return ret;
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*val = (ret >> chan->scan_type.shift) &
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GENMASK(chan->scan_type.realbits - 1, 0);
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return IIO_VAL_INT;
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}
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static irqreturn_t ad799x_event_handler(int irq, void *private)
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{
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struct iio_dev *indio_dev = private;
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struct ad799x_state *st = iio_priv(private);
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int i, ret;
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ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
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if (ret <= 0)
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goto done;
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if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
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AD7998_ALERT_STAT_CLEAR) < 0)
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goto done;
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for (i = 0; i < 8; i++) {
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if (ret & BIT(i))
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iio_push_event(indio_dev,
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i & 0x1 ?
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IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
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(i >> 1),
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_RISING) :
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IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,
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(i >> 1),
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_FALLING),
|
|
iio_get_time_ns(indio_dev));
|
|
}
|
|
|
|
done:
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
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 *ad799x_event_attributes[] = {
|
|
&iio_dev_attr_sampling_frequency.dev_attr.attr,
|
|
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group ad799x_event_attrs_group = {
|
|
.attrs = ad799x_event_attributes,
|
|
};
|
|
|
|
static const struct iio_info ad7991_info = {
|
|
.read_raw = &ad799x_read_raw,
|
|
.driver_module = THIS_MODULE,
|
|
.update_scan_mode = ad799x_update_scan_mode,
|
|
};
|
|
|
|
static const struct iio_info ad7993_4_7_8_noirq_info = {
|
|
.read_raw = &ad799x_read_raw,
|
|
.driver_module = THIS_MODULE,
|
|
.update_scan_mode = ad799x_update_scan_mode,
|
|
};
|
|
|
|
static const struct iio_info ad7993_4_7_8_irq_info = {
|
|
.read_raw = &ad799x_read_raw,
|
|
.event_attrs = &ad799x_event_attrs_group,
|
|
.read_event_config = &ad799x_read_event_config,
|
|
.write_event_config = &ad799x_write_event_config,
|
|
.read_event_value = &ad799x_read_event_value,
|
|
.write_event_value = &ad799x_write_event_value,
|
|
.driver_module = THIS_MODULE,
|
|
.update_scan_mode = ad799x_update_scan_mode,
|
|
};
|
|
|
|
static const struct iio_event_spec ad799x_events[] = {
|
|
{
|
|
.type = IIO_EV_TYPE_THRESH,
|
|
.dir = IIO_EV_DIR_RISING,
|
|
.mask_separate = BIT(IIO_EV_INFO_VALUE) |
|
|
BIT(IIO_EV_INFO_ENABLE),
|
|
}, {
|
|
.type = IIO_EV_TYPE_THRESH,
|
|
.dir = IIO_EV_DIR_FALLING,
|
|
.mask_separate = BIT(IIO_EV_INFO_VALUE) |
|
|
BIT(IIO_EV_INFO_ENABLE),
|
|
}, {
|
|
.type = IIO_EV_TYPE_THRESH,
|
|
.dir = IIO_EV_DIR_EITHER,
|
|
.mask_separate = BIT(IIO_EV_INFO_HYSTERESIS),
|
|
},
|
|
};
|
|
|
|
#define _AD799X_CHANNEL(_index, _realbits, _ev_spec, _num_ev_spec) { \
|
|
.type = IIO_VOLTAGE, \
|
|
.indexed = 1, \
|
|
.channel = (_index), \
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
|
|
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
|
|
.scan_index = (_index), \
|
|
.scan_type = { \
|
|
.sign = 'u', \
|
|
.realbits = (_realbits), \
|
|
.storagebits = 16, \
|
|
.shift = 12 - (_realbits), \
|
|
.endianness = IIO_BE, \
|
|
}, \
|
|
.event_spec = _ev_spec, \
|
|
.num_event_specs = _num_ev_spec, \
|
|
}
|
|
|
|
#define AD799X_CHANNEL(_index, _realbits) \
|
|
_AD799X_CHANNEL(_index, _realbits, NULL, 0)
|
|
|
|
#define AD799X_CHANNEL_WITH_EVENTS(_index, _realbits) \
|
|
_AD799X_CHANNEL(_index, _realbits, ad799x_events, \
|
|
ARRAY_SIZE(ad799x_events))
|
|
|
|
static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
|
|
[ad7991] = {
|
|
.num_channels = 5,
|
|
.noirq_config = {
|
|
.channel = {
|
|
AD799X_CHANNEL(0, 12),
|
|
AD799X_CHANNEL(1, 12),
|
|
AD799X_CHANNEL(2, 12),
|
|
AD799X_CHANNEL(3, 12),
|
|
IIO_CHAN_SOFT_TIMESTAMP(4),
|
|
},
|
|
.info = &ad7991_info,
|
|
},
|
|
},
|
|
[ad7995] = {
|
|
.num_channels = 5,
|
|
.noirq_config = {
|
|
.channel = {
|
|
AD799X_CHANNEL(0, 10),
|
|
AD799X_CHANNEL(1, 10),
|
|
AD799X_CHANNEL(2, 10),
|
|
AD799X_CHANNEL(3, 10),
|
|
IIO_CHAN_SOFT_TIMESTAMP(4),
|
|
},
|
|
.info = &ad7991_info,
|
|
},
|
|
},
|
|
[ad7999] = {
|
|
.num_channels = 5,
|
|
.noirq_config = {
|
|
.channel = {
|
|
AD799X_CHANNEL(0, 8),
|
|
AD799X_CHANNEL(1, 8),
|
|
AD799X_CHANNEL(2, 8),
|
|
AD799X_CHANNEL(3, 8),
|
|
IIO_CHAN_SOFT_TIMESTAMP(4),
|
|
},
|
|
.info = &ad7991_info,
|
|
},
|
|
},
|
|
[ad7992] = {
|
|
.num_channels = 3,
|
|
.noirq_config = {
|
|
.channel = {
|
|
AD799X_CHANNEL(0, 12),
|
|
AD799X_CHANNEL(1, 12),
|
|
IIO_CHAN_SOFT_TIMESTAMP(3),
|
|
},
|
|
.info = &ad7993_4_7_8_noirq_info,
|
|
},
|
|
.irq_config = {
|
|
.channel = {
|
|
AD799X_CHANNEL_WITH_EVENTS(0, 12),
|
|
AD799X_CHANNEL_WITH_EVENTS(1, 12),
|
|
IIO_CHAN_SOFT_TIMESTAMP(3),
|
|
},
|
|
.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
|
|
.info = &ad7993_4_7_8_irq_info,
|
|
},
|
|
},
|
|
[ad7993] = {
|
|
.num_channels = 5,
|
|
.noirq_config = {
|
|
.channel = {
|
|
AD799X_CHANNEL(0, 10),
|
|
AD799X_CHANNEL(1, 10),
|
|
AD799X_CHANNEL(2, 10),
|
|
AD799X_CHANNEL(3, 10),
|
|
IIO_CHAN_SOFT_TIMESTAMP(4),
|
|
},
|
|
.info = &ad7993_4_7_8_noirq_info,
|
|
},
|
|
.irq_config = {
|
|
.channel = {
|
|
AD799X_CHANNEL_WITH_EVENTS(0, 10),
|
|
AD799X_CHANNEL_WITH_EVENTS(1, 10),
|
|
AD799X_CHANNEL_WITH_EVENTS(2, 10),
|
|
AD799X_CHANNEL_WITH_EVENTS(3, 10),
|
|
IIO_CHAN_SOFT_TIMESTAMP(4),
|
|
},
|
|
.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
|
|
.info = &ad7993_4_7_8_irq_info,
|
|
},
|
|
},
|
|
[ad7994] = {
|
|
.num_channels = 5,
|
|
.noirq_config = {
|
|
.channel = {
|
|
AD799X_CHANNEL(0, 12),
|
|
AD799X_CHANNEL(1, 12),
|
|
AD799X_CHANNEL(2, 12),
|
|
AD799X_CHANNEL(3, 12),
|
|
IIO_CHAN_SOFT_TIMESTAMP(4),
|
|
},
|
|
.info = &ad7993_4_7_8_noirq_info,
|
|
},
|
|
.irq_config = {
|
|
.channel = {
|
|
AD799X_CHANNEL_WITH_EVENTS(0, 12),
|
|
AD799X_CHANNEL_WITH_EVENTS(1, 12),
|
|
AD799X_CHANNEL_WITH_EVENTS(2, 12),
|
|
AD799X_CHANNEL_WITH_EVENTS(3, 12),
|
|
IIO_CHAN_SOFT_TIMESTAMP(4),
|
|
},
|
|
.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
|
|
.info = &ad7993_4_7_8_irq_info,
|
|
},
|
|
},
|
|
[ad7997] = {
|
|
.num_channels = 9,
|
|
.noirq_config = {
|
|
.channel = {
|
|
AD799X_CHANNEL(0, 10),
|
|
AD799X_CHANNEL(1, 10),
|
|
AD799X_CHANNEL(2, 10),
|
|
AD799X_CHANNEL(3, 10),
|
|
AD799X_CHANNEL(4, 10),
|
|
AD799X_CHANNEL(5, 10),
|
|
AD799X_CHANNEL(6, 10),
|
|
AD799X_CHANNEL(7, 10),
|
|
IIO_CHAN_SOFT_TIMESTAMP(8),
|
|
},
|
|
.info = &ad7993_4_7_8_noirq_info,
|
|
},
|
|
.irq_config = {
|
|
.channel = {
|
|
AD799X_CHANNEL_WITH_EVENTS(0, 10),
|
|
AD799X_CHANNEL_WITH_EVENTS(1, 10),
|
|
AD799X_CHANNEL_WITH_EVENTS(2, 10),
|
|
AD799X_CHANNEL_WITH_EVENTS(3, 10),
|
|
AD799X_CHANNEL(4, 10),
|
|
AD799X_CHANNEL(5, 10),
|
|
AD799X_CHANNEL(6, 10),
|
|
AD799X_CHANNEL(7, 10),
|
|
IIO_CHAN_SOFT_TIMESTAMP(8),
|
|
},
|
|
.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
|
|
.info = &ad7993_4_7_8_irq_info,
|
|
},
|
|
},
|
|
[ad7998] = {
|
|
.num_channels = 9,
|
|
.noirq_config = {
|
|
.channel = {
|
|
AD799X_CHANNEL(0, 12),
|
|
AD799X_CHANNEL(1, 12),
|
|
AD799X_CHANNEL(2, 12),
|
|
AD799X_CHANNEL(3, 12),
|
|
AD799X_CHANNEL(4, 12),
|
|
AD799X_CHANNEL(5, 12),
|
|
AD799X_CHANNEL(6, 12),
|
|
AD799X_CHANNEL(7, 12),
|
|
IIO_CHAN_SOFT_TIMESTAMP(8),
|
|
},
|
|
.info = &ad7993_4_7_8_noirq_info,
|
|
},
|
|
.irq_config = {
|
|
.channel = {
|
|
AD799X_CHANNEL_WITH_EVENTS(0, 12),
|
|
AD799X_CHANNEL_WITH_EVENTS(1, 12),
|
|
AD799X_CHANNEL_WITH_EVENTS(2, 12),
|
|
AD799X_CHANNEL_WITH_EVENTS(3, 12),
|
|
AD799X_CHANNEL(4, 12),
|
|
AD799X_CHANNEL(5, 12),
|
|
AD799X_CHANNEL(6, 12),
|
|
AD799X_CHANNEL(7, 12),
|
|
IIO_CHAN_SOFT_TIMESTAMP(8),
|
|
},
|
|
.default_config = AD7998_ALERT_EN | AD7998_BUSY_ALERT,
|
|
.info = &ad7993_4_7_8_irq_info,
|
|
},
|
|
},
|
|
};
|
|
|
|
static int ad799x_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
int ret;
|
|
struct ad799x_state *st;
|
|
struct iio_dev *indio_dev;
|
|
const struct ad799x_chip_info *chip_info =
|
|
&ad799x_chip_info_tbl[id->driver_data];
|
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
|
|
if (indio_dev == NULL)
|
|
return -ENOMEM;
|
|
|
|
st = iio_priv(indio_dev);
|
|
/* this is only used for device removal purposes */
|
|
i2c_set_clientdata(client, indio_dev);
|
|
|
|
st->id = id->driver_data;
|
|
if (client->irq > 0 && chip_info->irq_config.info)
|
|
st->chip_config = &chip_info->irq_config;
|
|
else
|
|
st->chip_config = &chip_info->noirq_config;
|
|
|
|
/* TODO: Add pdata options for filtering and bit delay */
|
|
|
|
st->reg = devm_regulator_get(&client->dev, "vcc");
|
|
if (IS_ERR(st->reg))
|
|
return PTR_ERR(st->reg);
|
|
ret = regulator_enable(st->reg);
|
|
if (ret)
|
|
return ret;
|
|
st->vref = devm_regulator_get(&client->dev, "vref");
|
|
if (IS_ERR(st->vref)) {
|
|
ret = PTR_ERR(st->vref);
|
|
goto error_disable_reg;
|
|
}
|
|
ret = regulator_enable(st->vref);
|
|
if (ret)
|
|
goto error_disable_reg;
|
|
|
|
st->client = client;
|
|
|
|
indio_dev->dev.parent = &client->dev;
|
|
indio_dev->dev.of_node = client->dev.of_node;
|
|
indio_dev->name = id->name;
|
|
indio_dev->info = st->chip_config->info;
|
|
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->channels = st->chip_config->channel;
|
|
indio_dev->num_channels = chip_info->num_channels;
|
|
|
|
ret = ad799x_write_config(st, st->chip_config->default_config);
|
|
if (ret < 0)
|
|
goto error_disable_reg;
|
|
ret = ad799x_read_config(st);
|
|
if (ret < 0)
|
|
goto error_disable_reg;
|
|
st->config = ret;
|
|
|
|
ret = iio_triggered_buffer_setup(indio_dev, NULL,
|
|
&ad799x_trigger_handler, NULL);
|
|
if (ret)
|
|
goto error_disable_vref;
|
|
|
|
if (client->irq > 0) {
|
|
ret = devm_request_threaded_irq(&client->dev,
|
|
client->irq,
|
|
NULL,
|
|
ad799x_event_handler,
|
|
IRQF_TRIGGER_FALLING |
|
|
IRQF_ONESHOT,
|
|
client->name,
|
|
indio_dev);
|
|
if (ret)
|
|
goto error_cleanup_ring;
|
|
}
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret)
|
|
goto error_cleanup_ring;
|
|
|
|
return 0;
|
|
|
|
error_cleanup_ring:
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
error_disable_vref:
|
|
regulator_disable(st->vref);
|
|
error_disable_reg:
|
|
regulator_disable(st->reg);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ad799x_remove(struct i2c_client *client)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
|
struct ad799x_state *st = iio_priv(indio_dev);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
|
|
iio_triggered_buffer_cleanup(indio_dev);
|
|
regulator_disable(st->vref);
|
|
regulator_disable(st->reg);
|
|
kfree(st->rx_buf);
|
|
|
|
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 = ad799x_remove,
|
|
.id_table = ad799x_id,
|
|
};
|
|
module_i2c_driver(ad799x_driver);
|
|
|
|
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
|
|
MODULE_DESCRIPTION("Analog Devices AD799x ADC");
|
|
MODULE_LICENSE("GPL v2");
|