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Diffstat (limited to 'drivers/staging/iio/dac/ad5064.c')
-rw-r--r--drivers/staging/iio/dac/ad5064.c562
1 files changed, 0 insertions, 562 deletions
diff --git a/drivers/staging/iio/dac/ad5064.c b/drivers/staging/iio/dac/ad5064.c
deleted file mode 100644
index 047148aa66b2..000000000000
--- a/drivers/staging/iio/dac/ad5064.c
+++ /dev/null
@@ -1,562 +0,0 @@
-/*
- * AD5024, AD5025, AD5044, AD5045, AD5064, AD5064-1, AD5065, AD5628, AD5648,
- * AD5666, AD5668 Digital to analog converters driver
- *
- * Copyright 2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- */
-
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/spi/spi.h>
-#include <linux/slab.h>
-#include <linux/sysfs.h>
-#include <linux/regulator/consumer.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/sysfs.h>
-#include "dac.h"
-
-#define AD5064_MAX_DAC_CHANNELS 8
-#define AD5064_MAX_VREFS 4
-
-#define AD5064_ADDR(x) ((x) << 20)
-#define AD5064_CMD(x) ((x) << 24)
-
-#define AD5064_ADDR_DAC(chan) (chan)
-#define AD5064_ADDR_ALL_DAC 0xF
-
-#define AD5064_CMD_WRITE_INPUT_N 0x0
-#define AD5064_CMD_UPDATE_DAC_N 0x1
-#define AD5064_CMD_WRITE_INPUT_N_UPDATE_ALL 0x2
-#define AD5064_CMD_WRITE_INPUT_N_UPDATE_N 0x3
-#define AD5064_CMD_POWERDOWN_DAC 0x4
-#define AD5064_CMD_CLEAR 0x5
-#define AD5064_CMD_LDAC_MASK 0x6
-#define AD5064_CMD_RESET 0x7
-#define AD5064_CMD_CONFIG 0x8
-
-#define AD5064_CONFIG_DAISY_CHAIN_ENABLE BIT(1)
-#define AD5064_CONFIG_INT_VREF_ENABLE BIT(0)
-
-#define AD5064_LDAC_PWRDN_NONE 0x0
-#define AD5064_LDAC_PWRDN_1K 0x1
-#define AD5064_LDAC_PWRDN_100K 0x2
-#define AD5064_LDAC_PWRDN_3STATE 0x3
-
-/**
- * struct ad5064_chip_info - chip specific information
- * @shared_vref: whether the vref supply is shared between channels
- * @internal_vref: internal reference voltage. 0 if the chip has no internal
- * vref.
- * @channel: channel specification
- * @num_channels: number of channels
- */
-
-struct ad5064_chip_info {
- bool shared_vref;
- unsigned long internal_vref;
- const struct iio_chan_spec *channels;
- unsigned int num_channels;
-};
-
-/**
- * struct ad5064_state - driver instance specific data
- * @spi: spi_device
- * @chip_info: chip model specific constants, available modes etc
- * @vref_reg: vref supply regulators
- * @pwr_down: whether channel is powered down
- * @pwr_down_mode: channel's current power down mode
- * @dac_cache: current DAC raw value (chip does not support readback)
- * @use_internal_vref: set to true if the internal reference voltage should be
- * used.
- * @data: spi transfer buffers
- */
-
-struct ad5064_state {
- struct spi_device *spi;
- const struct ad5064_chip_info *chip_info;
- struct regulator_bulk_data vref_reg[AD5064_MAX_VREFS];
- bool pwr_down[AD5064_MAX_DAC_CHANNELS];
- u8 pwr_down_mode[AD5064_MAX_DAC_CHANNELS];
- unsigned int dac_cache[AD5064_MAX_DAC_CHANNELS];
- bool use_internal_vref;
-
- /*
- * DMA (thus cache coherency maintenance) requires the
- * transfer buffers to live in their own cache lines.
- */
- __be32 data ____cacheline_aligned;
-};
-
-enum ad5064_type {
- ID_AD5024,
- ID_AD5025,
- ID_AD5044,
- ID_AD5045,
- ID_AD5064,
- ID_AD5064_1,
- ID_AD5065,
- ID_AD5628_1,
- ID_AD5628_2,
- ID_AD5648_1,
- ID_AD5648_2,
- ID_AD5666_1,
- ID_AD5666_2,
- ID_AD5668_1,
- ID_AD5668_2,
-};
-
-static int ad5064_spi_write(struct ad5064_state *st, unsigned int cmd,
- unsigned int addr, unsigned int val, unsigned int shift)
-{
- val <<= shift;
-
- st->data = cpu_to_be32(AD5064_CMD(cmd) | AD5064_ADDR(addr) | val);
-
- return spi_write(st->spi, &st->data, sizeof(st->data));
-}
-
-static int ad5064_sync_powerdown_mode(struct ad5064_state *st,
- unsigned int channel)
-{
- unsigned int val;
- int ret;
-
- val = (0x1 << channel);
-
- if (st->pwr_down[channel])
- val |= st->pwr_down_mode[channel] << 8;
-
- ret = ad5064_spi_write(st, AD5064_CMD_POWERDOWN_DAC, 0, val, 0);
-
- return ret;
-}
-
-static const char ad5064_powerdown_modes[][15] = {
- [AD5064_LDAC_PWRDN_NONE] = "",
- [AD5064_LDAC_PWRDN_1K] = "1kohm_to_gnd",
- [AD5064_LDAC_PWRDN_100K] = "100kohm_to_gnd",
- [AD5064_LDAC_PWRDN_3STATE] = "three_state",
-};
-
-static ssize_t ad5064_read_powerdown_mode_available(struct iio_dev *indio_dev,
- uintptr_t private, const struct iio_chan_spec *chan, char *buf)
-{
- return sprintf(buf, "%s %s %s\n", ad5064_powerdown_modes[1],
- ad5064_powerdown_modes[2], ad5064_powerdown_modes[3]);
-}
-
-static ssize_t ad5064_read_powerdown_mode(struct iio_dev *indio_dev,
- uintptr_t private, const struct iio_chan_spec *chan, char *buf)
-{
- struct ad5064_state *st = iio_priv(indio_dev);
-
- return sprintf(buf, "%s\n",
- ad5064_powerdown_modes[st->pwr_down_mode[chan->channel]]);
-}
-
-static ssize_t ad5064_write_powerdown_mode(struct iio_dev *indio_dev,
- uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
- size_t len)
-{
- struct ad5064_state *st = iio_priv(indio_dev);
- unsigned int mode, i;
- int ret;
-
- mode = 0;
-
- for (i = 1; i < ARRAY_SIZE(ad5064_powerdown_modes); ++i) {
- if (sysfs_streq(buf, ad5064_powerdown_modes[i])) {
- mode = i;
- break;
- }
- }
- if (mode == 0)
- return -EINVAL;
-
- mutex_lock(&indio_dev->mlock);
- st->pwr_down_mode[chan->channel] = mode;
-
- ret = ad5064_sync_powerdown_mode(st, chan->channel);
- mutex_unlock(&indio_dev->mlock);
-
- return ret ? ret : len;
-}
-
-static ssize_t ad5064_read_dac_powerdown(struct iio_dev *indio_dev,
- uintptr_t private, const struct iio_chan_spec *chan, char *buf)
-{
- struct ad5064_state *st = iio_priv(indio_dev);
-
- return sprintf(buf, "%d\n", st->pwr_down[chan->channel]);
-}
-
-static ssize_t ad5064_write_dac_powerdown(struct iio_dev *indio_dev,
- uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
- size_t len)
-{
- struct ad5064_state *st = iio_priv(indio_dev);
- bool pwr_down;
- int ret;
-
- ret = strtobool(buf, &pwr_down);
- if (ret)
- return ret;
-
- mutex_lock(&indio_dev->mlock);
- st->pwr_down[chan->channel] = pwr_down;
-
- ret = ad5064_sync_powerdown_mode(st, chan->channel);
- mutex_unlock(&indio_dev->mlock);
- return ret ? ret : len;
-}
-
-static int ad5064_get_vref(struct ad5064_state *st,
- struct iio_chan_spec const *chan)
-{
- unsigned int i;
-
- if (st->use_internal_vref)
- return st->chip_info->internal_vref;
-
- i = st->chip_info->shared_vref ? 0 : chan->channel;
- return regulator_get_voltage(st->vref_reg[i].consumer);
-}
-
-static int ad5064_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val,
- int *val2,
- long m)
-{
- struct ad5064_state *st = iio_priv(indio_dev);
- int scale_uv;
-
- switch (m) {
- case IIO_CHAN_INFO_RAW:
- *val = st->dac_cache[chan->channel];
- return IIO_VAL_INT;
- case IIO_CHAN_INFO_SCALE:
- scale_uv = ad5064_get_vref(st, chan);
- if (scale_uv < 0)
- return scale_uv;
-
- scale_uv = (scale_uv * 100) >> chan->scan_type.realbits;
- *val = scale_uv / 100000;
- *val2 = (scale_uv % 100000) * 10;
- return IIO_VAL_INT_PLUS_MICRO;
- default:
- break;
- }
- return -EINVAL;
-}
-
-static int ad5064_write_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan, int val, int val2, long mask)
-{
- struct ad5064_state *st = iio_priv(indio_dev);
- int ret;
-
- switch (mask) {
- case IIO_CHAN_INFO_RAW:
- if (val > (1 << chan->scan_type.realbits) || val < 0)
- return -EINVAL;
-
- mutex_lock(&indio_dev->mlock);
- ret = ad5064_spi_write(st, AD5064_CMD_WRITE_INPUT_N_UPDATE_N,
- chan->address, val, chan->scan_type.shift);
- if (ret == 0)
- st->dac_cache[chan->channel] = val;
- mutex_unlock(&indio_dev->mlock);
- break;
- default:
- ret = -EINVAL;
- }
-
- return ret;
-}
-
-static const struct iio_info ad5064_info = {
- .read_raw = ad5064_read_raw,
- .write_raw = ad5064_write_raw,
- .driver_module = THIS_MODULE,
-};
-
-static struct iio_chan_spec_ext_info ad5064_ext_info[] = {
- {
- .name = "powerdown",
- .read = ad5064_read_dac_powerdown,
- .write = ad5064_write_dac_powerdown,
- },
- {
- .name = "powerdown_mode",
- .read = ad5064_read_powerdown_mode,
- .write = ad5064_write_powerdown_mode,
- },
- {
- .name = "powerdown_mode_available",
- .shared = true,
- .read = ad5064_read_powerdown_mode_available,
- },
- { },
-};
-
-#define AD5064_CHANNEL(chan, bits) { \
- .type = IIO_VOLTAGE, \
- .indexed = 1, \
- .output = 1, \
- .channel = (chan), \
- .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
- IIO_CHAN_INFO_SCALE_SEPARATE_BIT, \
- .address = AD5064_ADDR_DAC(chan), \
- .scan_type = IIO_ST('u', (bits), 16, 20 - (bits)), \
- .ext_info = ad5064_ext_info, \
-}
-
-#define DECLARE_AD5064_CHANNELS(name, bits) \
-const struct iio_chan_spec name[] = { \
- AD5064_CHANNEL(0, bits), \
- AD5064_CHANNEL(1, bits), \
- AD5064_CHANNEL(2, bits), \
- AD5064_CHANNEL(3, bits), \
- AD5064_CHANNEL(4, bits), \
- AD5064_CHANNEL(5, bits), \
- AD5064_CHANNEL(6, bits), \
- AD5064_CHANNEL(7, bits), \
-}
-
-static DECLARE_AD5064_CHANNELS(ad5024_channels, 12);
-static DECLARE_AD5064_CHANNELS(ad5044_channels, 14);
-static DECLARE_AD5064_CHANNELS(ad5064_channels, 16);
-
-static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
- [ID_AD5024] = {
- .shared_vref = false,
- .channels = ad5024_channels,
- .num_channels = 4,
- },
- [ID_AD5025] = {
- .shared_vref = false,
- .channels = ad5024_channels,
- .num_channels = 2,
- },
- [ID_AD5044] = {
- .shared_vref = false,
- .channels = ad5044_channels,
- .num_channels = 4,
- },
- [ID_AD5045] = {
- .shared_vref = false,
- .channels = ad5044_channels,
- .num_channels = 2,
- },
- [ID_AD5064] = {
- .shared_vref = false,
- .channels = ad5064_channels,
- .num_channels = 4,
- },
- [ID_AD5064_1] = {
- .shared_vref = true,
- .channels = ad5064_channels,
- .num_channels = 4,
- },
- [ID_AD5065] = {
- .shared_vref = false,
- .channels = ad5064_channels,
- .num_channels = 2,
- },
- [ID_AD5628_1] = {
- .shared_vref = true,
- .internal_vref = 2500000,
- .channels = ad5024_channels,
- .num_channels = 8,
- },
- [ID_AD5628_2] = {
- .shared_vref = true,
- .internal_vref = 5000000,
- .channels = ad5024_channels,
- .num_channels = 8,
- },
- [ID_AD5648_1] = {
- .shared_vref = true,
- .internal_vref = 2500000,
- .channels = ad5044_channels,
- .num_channels = 8,
- },
- [ID_AD5648_2] = {
- .shared_vref = true,
- .internal_vref = 5000000,
- .channels = ad5044_channels,
- .num_channels = 8,
- },
- [ID_AD5666_1] = {
- .shared_vref = true,
- .internal_vref = 2500000,
- .channels = ad5064_channels,
- .num_channels = 4,
- },
- [ID_AD5666_2] = {
- .shared_vref = true,
- .internal_vref = 5000000,
- .channels = ad5064_channels,
- .num_channels = 4,
- },
- [ID_AD5668_1] = {
- .shared_vref = true,
- .internal_vref = 2500000,
- .channels = ad5064_channels,
- .num_channels = 8,
- },
- [ID_AD5668_2] = {
- .shared_vref = true,
- .internal_vref = 5000000,
- .channels = ad5064_channels,
- .num_channels = 8,
- },
-};
-
-static inline unsigned int ad5064_num_vref(struct ad5064_state *st)
-{
- return st->chip_info->shared_vref ? 1 : st->chip_info->num_channels;
-}
-
-static const char * const ad5064_vref_names[] = {
- "vrefA",
- "vrefB",
- "vrefC",
- "vrefD",
-};
-
-static const char * const ad5064_vref_name(struct ad5064_state *st,
- unsigned int vref)
-{
- return st->chip_info->shared_vref ? "vref" : ad5064_vref_names[vref];
-}
-
-static int __devinit ad5064_probe(struct spi_device *spi)
-{
- enum ad5064_type type = spi_get_device_id(spi)->driver_data;
- struct iio_dev *indio_dev;
- struct ad5064_state *st;
- unsigned int i;
- int ret;
-
- indio_dev = iio_device_alloc(sizeof(*st));
- if (indio_dev == NULL)
- return -ENOMEM;
-
- st = iio_priv(indio_dev);
- spi_set_drvdata(spi, indio_dev);
-
- st->chip_info = &ad5064_chip_info_tbl[type];
- st->spi = spi;
-
- for (i = 0; i < ad5064_num_vref(st); ++i)
- st->vref_reg[i].supply = ad5064_vref_name(st, i);
-
- ret = regulator_bulk_get(&st->spi->dev, ad5064_num_vref(st),
- st->vref_reg);
- if (ret) {
- if (!st->chip_info->internal_vref)
- goto error_free;
- st->use_internal_vref = true;
- ret = ad5064_spi_write(st, AD5064_CMD_CONFIG, 0,
- AD5064_CONFIG_INT_VREF_ENABLE, 0);
- if (ret) {
- dev_err(&spi->dev, "Failed to enable internal vref: %d\n",
- ret);
- goto error_free;
- }
- } else {
- ret = regulator_bulk_enable(ad5064_num_vref(st), st->vref_reg);
- if (ret)
- goto error_free_reg;
- }
-
- for (i = 0; i < st->chip_info->num_channels; ++i) {
- st->pwr_down_mode[i] = AD5064_LDAC_PWRDN_1K;
- st->dac_cache[i] = 0x8000;
- }
-
- indio_dev->dev.parent = &spi->dev;
- indio_dev->name = spi_get_device_id(spi)->name;
- indio_dev->info = &ad5064_info;
- indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->channels = st->chip_info->channels;
- indio_dev->num_channels = st->chip_info->num_channels;
-
- ret = iio_device_register(indio_dev);
- if (ret)
- goto error_disable_reg;
-
- return 0;
-
-error_disable_reg:
- if (!st->use_internal_vref)
- regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);
-error_free_reg:
- if (!st->use_internal_vref)
- regulator_bulk_free(ad5064_num_vref(st), st->vref_reg);
-error_free:
- iio_device_free(indio_dev);
-
- return ret;
-}
-
-
-static int __devexit ad5064_remove(struct spi_device *spi)
-{
- struct iio_dev *indio_dev = spi_get_drvdata(spi);
- struct ad5064_state *st = iio_priv(indio_dev);
-
- iio_device_unregister(indio_dev);
-
- if (!st->use_internal_vref) {
- regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);
- regulator_bulk_free(ad5064_num_vref(st), st->vref_reg);
- }
-
- iio_device_free(indio_dev);
-
- return 0;
-}
-
-static const struct spi_device_id ad5064_id[] = {
- {"ad5024", ID_AD5024},
- {"ad5025", ID_AD5025},
- {"ad5044", ID_AD5044},
- {"ad5045", ID_AD5045},
- {"ad5064", ID_AD5064},
- {"ad5064-1", ID_AD5064_1},
- {"ad5065", ID_AD5065},
- {"ad5628-1", ID_AD5628_1},
- {"ad5628-2", ID_AD5628_2},
- {"ad5648-1", ID_AD5648_1},
- {"ad5648-2", ID_AD5648_2},
- {"ad5666-1", ID_AD5666_1},
- {"ad5666-2", ID_AD5666_2},
- {"ad5668-1", ID_AD5668_1},
- {"ad5668-2", ID_AD5668_2},
- {"ad5668-3", ID_AD5668_2}, /* similar enough to ad5668-2 */
- {}
-};
-MODULE_DEVICE_TABLE(spi, ad5064_id);
-
-static struct spi_driver ad5064_driver = {
- .driver = {
- .name = "ad5064",
- .owner = THIS_MODULE,
- },
- .probe = ad5064_probe,
- .remove = __devexit_p(ad5064_remove),
- .id_table = ad5064_id,
-};
-module_spi_driver(ad5064_driver);
-
-MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
-MODULE_DESCRIPTION("Analog Devices AD5024/25/44/45/64/64-1/65, AD5628/48/66/68 DAC");
-MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-13 13:56:51 +0000