435 строки
10 KiB
C
435 строки
10 KiB
C
/*
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* ti-dac5571.c - Texas Instruments 8/10/12-bit 1/4-channel DAC driver
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*
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* Copyright (C) 2018 Prevas A/S
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*
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* http://www.ti.com/lit/ds/symlink/dac5571.pdf
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* http://www.ti.com/lit/ds/symlink/dac6571.pdf
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* http://www.ti.com/lit/ds/symlink/dac7571.pdf
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* http://www.ti.com/lit/ds/symlink/dac5574.pdf
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* http://www.ti.com/lit/ds/symlink/dac6574.pdf
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* http://www.ti.com/lit/ds/symlink/dac7574.pdf
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* http://www.ti.com/lit/ds/symlink/dac5573.pdf
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* http://www.ti.com/lit/ds/symlink/dac6573.pdf
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* http://www.ti.com/lit/ds/symlink/dac7573.pdf
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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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#include <linux/iio/iio.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/of.h>
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#include <linux/regulator/consumer.h>
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enum chip_id {
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single_8bit, single_10bit, single_12bit,
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quad_8bit, quad_10bit, quad_12bit
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};
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struct dac5571_spec {
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u8 num_channels;
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u8 resolution;
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};
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static const struct dac5571_spec dac5571_spec[] = {
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[single_8bit] = {.num_channels = 1, .resolution = 8},
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[single_10bit] = {.num_channels = 1, .resolution = 10},
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[single_12bit] = {.num_channels = 1, .resolution = 12},
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[quad_8bit] = {.num_channels = 4, .resolution = 8},
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[quad_10bit] = {.num_channels = 4, .resolution = 10},
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[quad_12bit] = {.num_channels = 4, .resolution = 12},
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};
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struct dac5571_data {
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struct i2c_client *client;
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int id;
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struct mutex lock;
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struct regulator *vref;
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u16 val[4];
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bool powerdown;
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u8 powerdown_mode;
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struct dac5571_spec const *spec;
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int (*dac5571_cmd)(struct dac5571_data *data, int channel, u16 val);
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int (*dac5571_pwrdwn)(struct dac5571_data *data, int channel, u8 pwrdwn);
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u8 buf[3] ____cacheline_aligned;
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};
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#define DAC5571_POWERDOWN(mode) ((mode) + 1)
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#define DAC5571_POWERDOWN_FLAG BIT(0)
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#define DAC5571_CHANNEL_SELECT 1
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#define DAC5571_LOADMODE_DIRECT BIT(4)
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#define DAC5571_SINGLE_PWRDWN_BITS 4
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#define DAC5571_QUAD_PWRDWN_BITS 6
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static int dac5571_cmd_single(struct dac5571_data *data, int channel, u16 val)
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{
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unsigned int shift;
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shift = 12 - data->spec->resolution;
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data->buf[1] = val << shift;
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data->buf[0] = val >> (8 - shift);
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if (i2c_master_send(data->client, data->buf, 2) != 2)
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return -EIO;
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return 0;
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}
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static int dac5571_cmd_quad(struct dac5571_data *data, int channel, u16 val)
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{
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unsigned int shift;
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shift = 16 - data->spec->resolution;
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data->buf[2] = val << shift;
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data->buf[1] = (val >> (8 - shift));
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data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) |
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DAC5571_LOADMODE_DIRECT;
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if (i2c_master_send(data->client, data->buf, 3) != 3)
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return -EIO;
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return 0;
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}
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static int dac5571_pwrdwn_single(struct dac5571_data *data, int channel, u8 pwrdwn)
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{
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data->buf[1] = 0;
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data->buf[0] = pwrdwn << DAC5571_SINGLE_PWRDWN_BITS;
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if (i2c_master_send(data->client, data->buf, 2) != 2)
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return -EIO;
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return 0;
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}
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static int dac5571_pwrdwn_quad(struct dac5571_data *data, int channel, u8 pwrdwn)
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{
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data->buf[2] = 0;
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data->buf[1] = pwrdwn << DAC5571_QUAD_PWRDWN_BITS;
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data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) |
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DAC5571_LOADMODE_DIRECT | DAC5571_POWERDOWN_FLAG;
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if (i2c_master_send(data->client, data->buf, 3) != 3)
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return -EIO;
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return 0;
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}
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static const char *const dac5571_powerdown_modes[] = {
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"1kohm_to_gnd", "100kohm_to_gnd", "three_state",
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};
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static int dac5571_get_powerdown_mode(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan)
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{
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struct dac5571_data *data = iio_priv(indio_dev);
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return data->powerdown_mode;
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}
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static int dac5571_set_powerdown_mode(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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unsigned int mode)
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{
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struct dac5571_data *data = iio_priv(indio_dev);
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int ret = 0;
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if (data->powerdown_mode == mode)
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return 0;
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mutex_lock(&data->lock);
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if (data->powerdown) {
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ret = data->dac5571_pwrdwn(data, chan->channel,
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DAC5571_POWERDOWN(mode));
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if (ret)
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goto out;
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}
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data->powerdown_mode = mode;
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out:
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mutex_unlock(&data->lock);
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return ret;
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}
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static const struct iio_enum dac5571_powerdown_mode = {
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.items = dac5571_powerdown_modes,
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.num_items = ARRAY_SIZE(dac5571_powerdown_modes),
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.get = dac5571_get_powerdown_mode,
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.set = dac5571_set_powerdown_mode,
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};
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static ssize_t dac5571_read_powerdown(struct iio_dev *indio_dev,
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uintptr_t private,
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const struct iio_chan_spec *chan,
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char *buf)
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{
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struct dac5571_data *data = iio_priv(indio_dev);
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return sprintf(buf, "%d\n", data->powerdown);
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}
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static ssize_t dac5571_write_powerdown(struct iio_dev *indio_dev,
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uintptr_t private,
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const struct iio_chan_spec *chan,
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const char *buf, size_t len)
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{
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struct dac5571_data *data = iio_priv(indio_dev);
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bool powerdown;
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int ret;
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ret = strtobool(buf, &powerdown);
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if (ret)
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return ret;
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if (data->powerdown == powerdown)
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return len;
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mutex_lock(&data->lock);
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if (powerdown)
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ret = data->dac5571_pwrdwn(data, chan->channel,
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DAC5571_POWERDOWN(data->powerdown_mode));
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else
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ret = data->dac5571_cmd(data, chan->channel, data->val[0]);
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if (ret)
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goto out;
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data->powerdown = powerdown;
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out:
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mutex_unlock(&data->lock);
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return ret ? ret : len;
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}
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static const struct iio_chan_spec_ext_info dac5571_ext_info[] = {
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{
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.name = "powerdown",
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.read = dac5571_read_powerdown,
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.write = dac5571_write_powerdown,
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.shared = IIO_SHARED_BY_TYPE,
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},
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IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, &dac5571_powerdown_mode),
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IIO_ENUM_AVAILABLE("powerdown_mode", &dac5571_powerdown_mode),
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{},
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};
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#define dac5571_CHANNEL(chan, name) { \
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.type = IIO_VOLTAGE, \
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.channel = (chan), \
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.address = (chan), \
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.indexed = true, \
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.output = true, \
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.datasheet_name = name, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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.ext_info = dac5571_ext_info, \
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}
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static const struct iio_chan_spec dac5571_channels[] = {
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dac5571_CHANNEL(0, "A"),
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dac5571_CHANNEL(1, "B"),
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dac5571_CHANNEL(2, "C"),
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dac5571_CHANNEL(3, "D"),
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};
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static int dac5571_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct dac5571_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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*val = data->val[chan->channel];
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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(data->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 = data->spec->resolution;
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return IIO_VAL_FRACTIONAL_LOG2;
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default:
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return -EINVAL;
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}
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}
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static int dac5571_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct dac5571_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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if (data->val[chan->channel] == val)
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return 0;
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if (val >= (1 << data->spec->resolution) || val < 0)
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return -EINVAL;
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if (data->powerdown)
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return -EBUSY;
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mutex_lock(&data->lock);
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ret = data->dac5571_cmd(data, chan->channel, val);
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if (ret == 0)
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data->val[chan->channel] = val;
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mutex_unlock(&data->lock);
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return ret;
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default:
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return -EINVAL;
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}
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}
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static int dac5571_write_raw_get_fmt(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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long mask)
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{
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return IIO_VAL_INT;
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}
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static const struct iio_info dac5571_info = {
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.read_raw = dac5571_read_raw,
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.write_raw = dac5571_write_raw,
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.write_raw_get_fmt = dac5571_write_raw_get_fmt,
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};
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static int dac5571_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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const struct dac5571_spec *spec;
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struct dac5571_data *data;
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struct iio_dev *indio_dev;
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int ret, i;
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indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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indio_dev->dev.parent = dev;
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indio_dev->dev.of_node = client->dev.of_node;
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indio_dev->info = &dac5571_info;
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indio_dev->name = id->name;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = dac5571_channels;
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spec = &dac5571_spec[id->driver_data];
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indio_dev->num_channels = spec->num_channels;
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data->spec = spec;
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data->vref = devm_regulator_get(dev, "vref");
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if (IS_ERR(data->vref))
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return PTR_ERR(data->vref);
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ret = regulator_enable(data->vref);
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if (ret < 0)
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return ret;
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mutex_init(&data->lock);
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switch (spec->num_channels) {
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case 1:
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data->dac5571_cmd = dac5571_cmd_single;
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data->dac5571_pwrdwn = dac5571_pwrdwn_single;
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break;
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case 4:
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data->dac5571_cmd = dac5571_cmd_quad;
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data->dac5571_pwrdwn = dac5571_pwrdwn_quad;
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break;
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default:
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goto err;
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}
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for (i = 0; i < spec->num_channels; i++) {
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ret = data->dac5571_cmd(data, i, 0);
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if (ret) {
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dev_err(dev, "failed to initialize channel %d to 0\n", i);
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goto err;
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}
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}
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ret = iio_device_register(indio_dev);
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if (ret)
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goto err;
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return 0;
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err:
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regulator_disable(data->vref);
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return ret;
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}
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static int dac5571_remove(struct i2c_client *i2c)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(i2c);
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struct dac5571_data *data = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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regulator_disable(data->vref);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id dac5571_of_id[] = {
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{.compatible = "ti,dac5571"},
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{.compatible = "ti,dac6571"},
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{.compatible = "ti,dac7571"},
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{.compatible = "ti,dac5574"},
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{.compatible = "ti,dac6574"},
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{.compatible = "ti,dac7574"},
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{.compatible = "ti,dac5573"},
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{.compatible = "ti,dac6573"},
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{.compatible = "ti,dac7573"},
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{}
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};
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MODULE_DEVICE_TABLE(of, dac5571_of_id);
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#endif
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static const struct i2c_device_id dac5571_id[] = {
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{"dac5571", single_8bit},
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{"dac6571", single_10bit},
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{"dac7571", single_12bit},
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{"dac5574", quad_8bit},
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{"dac6574", quad_10bit},
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{"dac7574", quad_12bit},
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{"dac5573", quad_8bit},
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{"dac6573", quad_10bit},
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{"dac7573", quad_12bit},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, dac5571_id);
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static struct i2c_driver dac5571_driver = {
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.driver = {
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.name = "ti-dac5571",
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.of_match_table = of_match_ptr(dac5571_of_id),
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},
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.probe = dac5571_probe,
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.remove = dac5571_remove,
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.id_table = dac5571_id,
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};
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module_i2c_driver(dac5571_driver);
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MODULE_AUTHOR("Sean Nyekjaer <sean@geanix.dk>");
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MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 1/4-channel DAC driver");
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MODULE_LICENSE("GPL v2");
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