diff options
Diffstat (limited to 'drivers/staging/iio/adc/ad7793.c')
| -rw-r--r-- | drivers/staging/iio/adc/ad7793.c | 566 |
1 files changed, 0 insertions, 566 deletions
diff --git a/drivers/staging/iio/adc/ad7793.c b/drivers/staging/iio/adc/ad7793.c deleted file mode 100644 index 691a7be6f5cb..000000000000 --- a/drivers/staging/iio/adc/ad7793.c +++ /dev/null @@ -1,566 +0,0 @@ -/* - * AD7785/AD7792/AD7793/AD7794/AD7795 SPI ADC driver - * - * Copyright 2011-2012 Analog Devices Inc. - * - * Licensed under the GPL-2. - */ - -#include <linux/interrupt.h> -#include <linux/device.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/sysfs.h> -#include <linux/spi/spi.h> -#include <linux/regulator/consumer.h> -#include <linux/err.h> -#include <linux/sched.h> -#include <linux/delay.h> -#include <linux/module.h> - -#include <linux/iio/iio.h> -#include <linux/iio/sysfs.h> -#include <linux/iio/buffer.h> -#include <linux/iio/trigger.h> -#include <linux/iio/trigger_consumer.h> -#include <linux/iio/triggered_buffer.h> -#include <linux/iio/adc/ad_sigma_delta.h> - -#include "ad7793.h" - -/* NOTE: - * The AD7792/AD7793 features a dual use data out ready DOUT/RDY output. - * In order to avoid contentions on the SPI bus, it's therefore necessary - * to use spi bus locking. - * - * The DOUT/RDY output must also be wired to an interrupt capable GPIO. - */ - -struct ad7793_chip_info { - const struct iio_chan_spec *channels; - unsigned int num_channels; -}; - -struct ad7793_state { - const struct ad7793_chip_info *chip_info; - struct regulator *reg; - u16 int_vref_mv; - u16 mode; - u16 conf; - u32 scale_avail[8][2]; - - struct ad_sigma_delta sd; - -}; - -enum ad7793_supported_device_ids { - ID_AD7785, - ID_AD7792, - ID_AD7793, - ID_AD7794, - ID_AD7795, -}; - -static struct ad7793_state *ad_sigma_delta_to_ad7793(struct ad_sigma_delta *sd) -{ - return container_of(sd, struct ad7793_state, sd); -} - -static int ad7793_set_channel(struct ad_sigma_delta *sd, unsigned int channel) -{ - struct ad7793_state *st = ad_sigma_delta_to_ad7793(sd); - - st->conf &= ~AD7793_CONF_CHAN_MASK; - st->conf |= AD7793_CONF_CHAN(channel); - - return ad_sd_write_reg(&st->sd, AD7793_REG_CONF, 2, st->conf); -} - -static int ad7793_set_mode(struct ad_sigma_delta *sd, - enum ad_sigma_delta_mode mode) -{ - struct ad7793_state *st = ad_sigma_delta_to_ad7793(sd); - - st->mode &= ~AD7793_MODE_SEL_MASK; - st->mode |= AD7793_MODE_SEL(mode); - - return ad_sd_write_reg(&st->sd, AD7793_REG_MODE, 2, st->mode); -} - -static const struct ad_sigma_delta_info ad7793_sigma_delta_info = { - .set_channel = ad7793_set_channel, - .set_mode = ad7793_set_mode, - .has_registers = true, - .addr_shift = 3, - .read_mask = BIT(6), -}; - -static const struct ad_sd_calib_data ad7793_calib_arr[6] = { - {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN1P_AIN1M}, - {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN1P_AIN1M}, - {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN2P_AIN2M}, - {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN2P_AIN2M}, - {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN3P_AIN3M}, - {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN3P_AIN3M} -}; - -static int ad7793_calibrate_all(struct ad7793_state *st) -{ - return ad_sd_calibrate_all(&st->sd, ad7793_calib_arr, - ARRAY_SIZE(ad7793_calib_arr)); -} - -static int ad7793_setup(struct iio_dev *indio_dev, - const struct ad7793_platform_data *pdata) -{ - struct ad7793_state *st = iio_priv(indio_dev); - int i, ret = -1; - unsigned long long scale_uv; - u32 id; - - /* reset the serial interface */ - ret = spi_write(st->sd.spi, (u8 *)&ret, sizeof(ret)); - if (ret < 0) - goto out; - msleep(1); /* Wait for at least 500us */ - - /* write/read test for device presence */ - ret = ad_sd_read_reg(&st->sd, AD7793_REG_ID, 1, &id); - if (ret) - goto out; - - id &= AD7793_ID_MASK; - - if (!((id == AD7792_ID) || (id == AD7793_ID) || (id == AD7795_ID))) { - dev_err(&st->sd.spi->dev, "device ID query failed\n"); - goto out; - } - - st->mode = pdata->mode; - st->conf = pdata->conf; - - ret = ad7793_set_mode(&st->sd, AD_SD_MODE_IDLE); - if (ret) - goto out; - - ret = ad7793_set_channel(&st->sd, 0); - if (ret) - goto out; - - ret = ad_sd_write_reg(&st->sd, AD7793_REG_IO, - sizeof(pdata->io), pdata->io); - if (ret) - goto out; - - ret = ad7793_calibrate_all(st); - if (ret) - goto out; - - /* Populate available ADC input ranges */ - for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) { - scale_uv = ((u64)st->int_vref_mv * 100000000) - >> (st->chip_info->channels[0].scan_type.realbits - - (!!(st->conf & AD7793_CONF_UNIPOLAR) ? 0 : 1)); - scale_uv >>= i; - - st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10; - st->scale_avail[i][0] = scale_uv; - } - - return 0; -out: - dev_err(&st->sd.spi->dev, "setup failed\n"); - return ret; -} - -static const u16 sample_freq_avail[16] = {0, 470, 242, 123, 62, 50, 39, 33, 19, - 17, 16, 12, 10, 8, 6, 4}; - -static ssize_t ad7793_read_frequency(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct iio_dev *indio_dev = dev_to_iio_dev(dev); - struct ad7793_state *st = iio_priv(indio_dev); - - return sprintf(buf, "%d\n", - sample_freq_avail[AD7793_MODE_RATE(st->mode)]); -} - -static ssize_t ad7793_write_frequency(struct device *dev, - struct device_attribute *attr, - const char *buf, - size_t len) -{ - struct iio_dev *indio_dev = dev_to_iio_dev(dev); - struct ad7793_state *st = iio_priv(indio_dev); - long lval; - int i, ret; - - mutex_lock(&indio_dev->mlock); - if (iio_buffer_enabled(indio_dev)) { - mutex_unlock(&indio_dev->mlock); - return -EBUSY; - } - mutex_unlock(&indio_dev->mlock); - - ret = strict_strtol(buf, 10, &lval); - if (ret) - return ret; - - ret = -EINVAL; - - for (i = 0; i < ARRAY_SIZE(sample_freq_avail); i++) - if (lval == sample_freq_avail[i]) { - mutex_lock(&indio_dev->mlock); - st->mode &= ~AD7793_MODE_RATE(-1); - st->mode |= AD7793_MODE_RATE(i); - ad_sd_write_reg(&st->sd, AD7793_REG_MODE, - sizeof(st->mode), st->mode); - mutex_unlock(&indio_dev->mlock); - ret = 0; - } - - return ret ? ret : len; -} - -static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, - ad7793_read_frequency, - ad7793_write_frequency); - -static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( - "470 242 123 62 50 39 33 19 17 16 12 10 8 6 4"); - -static ssize_t ad7793_show_scale_available(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct iio_dev *indio_dev = dev_to_iio_dev(dev); - struct ad7793_state *st = iio_priv(indio_dev); - int i, len = 0; - - for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) - len += sprintf(buf + len, "%d.%09u ", st->scale_avail[i][0], - st->scale_avail[i][1]); - - len += sprintf(buf + len, "\n"); - - return len; -} - -static IIO_DEVICE_ATTR_NAMED(in_m_in_scale_available, - in_voltage-voltage_scale_available, S_IRUGO, - ad7793_show_scale_available, NULL, 0); - -static struct attribute *ad7793_attributes[] = { - &iio_dev_attr_sampling_frequency.dev_attr.attr, - &iio_const_attr_sampling_frequency_available.dev_attr.attr, - &iio_dev_attr_in_m_in_scale_available.dev_attr.attr, - NULL -}; - -static const struct attribute_group ad7793_attribute_group = { - .attrs = ad7793_attributes, -}; - -static int ad7793_read_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int *val, - int *val2, - long m) -{ - struct ad7793_state *st = iio_priv(indio_dev); - int ret; - unsigned long long scale_uv; - bool unipolar = !!(st->conf & AD7793_CONF_UNIPOLAR); - - switch (m) { - case IIO_CHAN_INFO_RAW: - ret = ad_sigma_delta_single_conversion(indio_dev, chan, val); - if (ret < 0) - return ret; - - return IIO_VAL_INT; - - case IIO_CHAN_INFO_SCALE: - switch (chan->type) { - case IIO_VOLTAGE: - if (chan->differential) { - *val = st-> - scale_avail[(st->conf >> 8) & 0x7][0]; - *val2 = st-> - scale_avail[(st->conf >> 8) & 0x7][1]; - return IIO_VAL_INT_PLUS_NANO; - } else { - /* 1170mV / 2^23 * 6 */ - scale_uv = (1170ULL * 100000000ULL * 6ULL); - } - break; - case IIO_TEMP: - /* 1170mV / 0.81 mV/C / 2^23 */ - scale_uv = 1444444444444ULL; - break; - default: - return -EINVAL; - } - - scale_uv >>= (chan->scan_type.realbits - (unipolar ? 0 : 1)); - *val = 0; - *val2 = scale_uv; - return IIO_VAL_INT_PLUS_NANO; - case IIO_CHAN_INFO_OFFSET: - if (!unipolar) - *val = -(1 << (chan->scan_type.realbits - 1)); - else - *val = 0; - - /* Kelvin to Celsius */ - if (chan->type == IIO_TEMP) { - unsigned long long offset; - unsigned int shift; - - shift = chan->scan_type.realbits - (unipolar ? 0 : 1); - offset = 273ULL << shift; - do_div(offset, 1444); - *val -= offset; - } - return IIO_VAL_INT; - } - return -EINVAL; -} - -static int ad7793_write_raw(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - int val, - int val2, - long mask) -{ - struct ad7793_state *st = iio_priv(indio_dev); - int ret, i; - unsigned int tmp; - - mutex_lock(&indio_dev->mlock); - if (iio_buffer_enabled(indio_dev)) { - mutex_unlock(&indio_dev->mlock); - return -EBUSY; - } - - switch (mask) { - case IIO_CHAN_INFO_SCALE: - ret = -EINVAL; - for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) - if (val2 == st->scale_avail[i][1]) { - ret = 0; - tmp = st->conf; - st->conf &= ~AD7793_CONF_GAIN(-1); - st->conf |= AD7793_CONF_GAIN(i); - - if (tmp == st->conf) - break; - - ad_sd_write_reg(&st->sd, AD7793_REG_CONF, - sizeof(st->conf), st->conf); - ad7793_calibrate_all(st); - break; - } - break; - default: - ret = -EINVAL; - } - - mutex_unlock(&indio_dev->mlock); - return ret; -} - -static int ad7793_write_raw_get_fmt(struct iio_dev *indio_dev, - struct iio_chan_spec const *chan, - long mask) -{ - return IIO_VAL_INT_PLUS_NANO; -} - -static const struct iio_info ad7793_info = { - .read_raw = &ad7793_read_raw, - .write_raw = &ad7793_write_raw, - .write_raw_get_fmt = &ad7793_write_raw_get_fmt, - .attrs = &ad7793_attribute_group, - .validate_trigger = ad_sd_validate_trigger, - .driver_module = THIS_MODULE, -}; - -#define DECLARE_AD7793_CHANNELS(_name, _b, _sb, _s) \ -const struct iio_chan_spec _name##_channels[] = { \ - AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), (_s)), \ - AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), (_s)), \ - AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), (_s)), \ - AD_SD_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), (_s)), \ - AD_SD_TEMP_CHANNEL(4, AD7793_CH_TEMP, (_b), (_sb), (_s)), \ - AD_SD_SUPPLY_CHANNEL(5, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), (_s)), \ - IIO_CHAN_SOFT_TIMESTAMP(6), \ -} - -#define DECLARE_AD7795_CHANNELS(_name, _b, _sb) \ -const struct iio_chan_spec _name##_channels[] = { \ - AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \ - AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \ - AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \ - AD_SD_DIFF_CHANNEL(3, 3, 3, AD7795_CH_AIN4P_AIN4M, (_b), (_sb), 0), \ - AD_SD_DIFF_CHANNEL(4, 4, 4, AD7795_CH_AIN5P_AIN5M, (_b), (_sb), 0), \ - AD_SD_DIFF_CHANNEL(5, 5, 5, AD7795_CH_AIN6P_AIN6M, (_b), (_sb), 0), \ - AD_SD_SHORTED_CHANNEL(6, 0, AD7795_CH_AIN1M_AIN1M, (_b), (_sb), 0), \ - AD_SD_TEMP_CHANNEL(7, AD7793_CH_TEMP, (_b), (_sb), 0), \ - AD_SD_SUPPLY_CHANNEL(8, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \ - IIO_CHAN_SOFT_TIMESTAMP(9), \ -} - -static DECLARE_AD7793_CHANNELS(ad7785, 20, 32, 4); -static DECLARE_AD7793_CHANNELS(ad7792, 16, 32, 0); -static DECLARE_AD7793_CHANNELS(ad7793, 24, 32, 0); -static DECLARE_AD7795_CHANNELS(ad7794, 16, 32); -static DECLARE_AD7795_CHANNELS(ad7795, 24, 32); - -static const struct ad7793_chip_info ad7793_chip_info_tbl[] = { - [ID_AD7785] = { - .channels = ad7785_channels, - .num_channels = ARRAY_SIZE(ad7785_channels), - }, - [ID_AD7792] = { - .channels = ad7792_channels, - .num_channels = ARRAY_SIZE(ad7792_channels), - }, - [ID_AD7793] = { - .channels = ad7793_channels, - .num_channels = ARRAY_SIZE(ad7793_channels), - }, - [ID_AD7794] = { - .channels = ad7794_channels, - .num_channels = ARRAY_SIZE(ad7794_channels), - }, - [ID_AD7795] = { - .channels = ad7795_channels, - .num_channels = ARRAY_SIZE(ad7795_channels), - }, -}; - -static int __devinit ad7793_probe(struct spi_device *spi) -{ - const struct ad7793_platform_data *pdata = spi->dev.platform_data; - struct ad7793_state *st; - struct iio_dev *indio_dev; - int ret, voltage_uv = 0; - - if (!pdata) { - dev_err(&spi->dev, "no platform data?\n"); - return -ENODEV; - } - - if (!spi->irq) { - dev_err(&spi->dev, "no IRQ?\n"); - return -ENODEV; - } - - indio_dev = iio_device_alloc(sizeof(*st)); - if (indio_dev == NULL) - return -ENOMEM; - - st = iio_priv(indio_dev); - - ad_sd_init(&st->sd, indio_dev, spi, &ad7793_sigma_delta_info); - - st->reg = regulator_get(&spi->dev, "vcc"); - if (!IS_ERR(st->reg)) { - ret = regulator_enable(st->reg); - if (ret) - goto error_put_reg; - - voltage_uv = regulator_get_voltage(st->reg); - } - - st->chip_info = - &ad7793_chip_info_tbl[spi_get_device_id(spi)->driver_data]; - - if (pdata && pdata->vref_mv) - st->int_vref_mv = pdata->vref_mv; - else if (voltage_uv) - st->int_vref_mv = voltage_uv / 1000; - else - st->int_vref_mv = 1170; /* Build-in ref */ - - spi_set_drvdata(spi, indio_dev); - - indio_dev->dev.parent = &spi->dev; - indio_dev->name = spi_get_device_id(spi)->name; - indio_dev->modes = INDIO_DIRECT_MODE; - indio_dev->channels = st->chip_info->channels; - indio_dev->num_channels = st->chip_info->num_channels; - indio_dev->info = &ad7793_info; - - ret = ad_sd_setup_buffer_and_trigger(indio_dev); - if (ret) - goto error_disable_reg; - - ret = ad7793_setup(indio_dev, pdata); - if (ret) - goto error_remove_trigger; - - ret = iio_device_register(indio_dev); - if (ret) - goto error_remove_trigger; - - return 0; - -error_remove_trigger: - ad_sd_cleanup_buffer_and_trigger(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); - - iio_device_free(indio_dev); - - return ret; -} - -static int __devexit ad7793_remove(struct spi_device *spi) -{ - struct iio_dev *indio_dev = spi_get_drvdata(spi); - struct ad7793_state *st = iio_priv(indio_dev); - - iio_device_unregister(indio_dev); - ad_sd_cleanup_buffer_and_trigger(indio_dev); - - if (!IS_ERR(st->reg)) { - regulator_disable(st->reg); - regulator_put(st->reg); - } - - iio_device_free(indio_dev); - - return 0; -} - -static const struct spi_device_id ad7793_id[] = { - {"ad7785", ID_AD7785}, - {"ad7792", ID_AD7792}, - {"ad7793", ID_AD7793}, - {"ad7794", ID_AD7794}, - {"ad7795", ID_AD7795}, - {} -}; -MODULE_DEVICE_TABLE(spi, ad7793_id); - -static struct spi_driver ad7793_driver = { - .driver = { - .name = "ad7793", - .owner = THIS_MODULE, - }, - .probe = ad7793_probe, - .remove = __devexit_p(ad7793_remove), - .id_table = ad7793_id, -}; -module_spi_driver(ad7793_driver); - -MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); -MODULE_DESCRIPTION("Analog Devices AD7793 and simialr ADCs"); -MODULE_LICENSE("GPL v2"); |