![Lars-Peter Clausen](/assets/img/avatar_default.png)
Autogenerated using the following coccinelle semantic patch: // <smpl> @r1@ identifier driver; identifier fn; position p; type T; @@ T driver = { .remove = ( fn@p | __devexit_p(fn@p) ) }; @r2@ identifier r1.fn; position p != r1.p; @@ fn@p @r3@ identifier r1.fn; position r1.p; @@ ( __devexit_p(fn@p) | -fn@p +__devexit_p(fn) ) @depends on !r2@ identifier r1.fn; @@ static -int fn +int __devexit fn (...) { ... } @r11@ identifier driver; identifier fn; position p; type T; @@ T driver = { .probe = fn@p }; @r12@ identifier r11.fn; position p != r11.p; @@ fn@p @depends on !r12@ identifier r11.fn; @@ static -int fn +int __devinit fn (...) { ... } // </smpl> Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
567 lines
14 KiB
C
567 lines
14 KiB
C
/*
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* AD7785/AD7792/AD7793/AD7794/AD7795 SPI ADC driver
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*
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* Copyright 2011-2012 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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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/slab.h>
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#include <linux/sysfs.h>
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#include <linux/spi/spi.h>
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#include <linux/regulator/consumer.h>
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#include <linux/err.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/module.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/buffer.h>
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#include <linux/iio/trigger.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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#include <linux/iio/adc/ad_sigma_delta.h>
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#include "ad7793.h"
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/* NOTE:
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* The AD7792/AD7793 features a dual use data out ready DOUT/RDY output.
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* In order to avoid contentions on the SPI bus, it's therefore necessary
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* to use spi bus locking.
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*
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* The DOUT/RDY output must also be wired to an interrupt capable GPIO.
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*/
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struct ad7793_chip_info {
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const struct iio_chan_spec *channels;
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unsigned int num_channels;
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};
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struct ad7793_state {
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const struct ad7793_chip_info *chip_info;
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struct regulator *reg;
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u16 int_vref_mv;
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u16 mode;
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u16 conf;
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u32 scale_avail[8][2];
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struct ad_sigma_delta sd;
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};
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enum ad7793_supported_device_ids {
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ID_AD7785,
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ID_AD7792,
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ID_AD7793,
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ID_AD7794,
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ID_AD7795,
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};
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static struct ad7793_state *ad_sigma_delta_to_ad7793(struct ad_sigma_delta *sd)
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{
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return container_of(sd, struct ad7793_state, sd);
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}
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static int ad7793_set_channel(struct ad_sigma_delta *sd, unsigned int channel)
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{
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struct ad7793_state *st = ad_sigma_delta_to_ad7793(sd);
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st->conf &= ~AD7793_CONF_CHAN_MASK;
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st->conf |= AD7793_CONF_CHAN(channel);
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return ad_sd_write_reg(&st->sd, AD7793_REG_CONF, 2, st->conf);
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}
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static int ad7793_set_mode(struct ad_sigma_delta *sd,
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enum ad_sigma_delta_mode mode)
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{
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struct ad7793_state *st = ad_sigma_delta_to_ad7793(sd);
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st->mode &= ~AD7793_MODE_SEL_MASK;
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st->mode |= AD7793_MODE_SEL(mode);
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return ad_sd_write_reg(&st->sd, AD7793_REG_MODE, 2, st->mode);
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}
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static const struct ad_sigma_delta_info ad7793_sigma_delta_info = {
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.set_channel = ad7793_set_channel,
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.set_mode = ad7793_set_mode,
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.has_registers = true,
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.addr_shift = 3,
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.read_mask = BIT(6),
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};
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static const struct ad_sd_calib_data ad7793_calib_arr[6] = {
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{AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN1P_AIN1M},
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{AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN1P_AIN1M},
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{AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN2P_AIN2M},
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{AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN2P_AIN2M},
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{AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN3P_AIN3M},
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{AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN3P_AIN3M}
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};
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static int ad7793_calibrate_all(struct ad7793_state *st)
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{
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return ad_sd_calibrate_all(&st->sd, ad7793_calib_arr,
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ARRAY_SIZE(ad7793_calib_arr));
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}
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static int ad7793_setup(struct iio_dev *indio_dev,
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const struct ad7793_platform_data *pdata)
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{
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struct ad7793_state *st = iio_priv(indio_dev);
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int i, ret = -1;
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unsigned long long scale_uv;
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u32 id;
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/* reset the serial interface */
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ret = spi_write(st->sd.spi, (u8 *)&ret, sizeof(ret));
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if (ret < 0)
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goto out;
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msleep(1); /* Wait for at least 500us */
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/* write/read test for device presence */
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ret = ad_sd_read_reg(&st->sd, AD7793_REG_ID, 1, &id);
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if (ret)
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goto out;
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id &= AD7793_ID_MASK;
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if (!((id == AD7792_ID) || (id == AD7793_ID) || (id == AD7795_ID))) {
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dev_err(&st->sd.spi->dev, "device ID query failed\n");
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goto out;
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}
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st->mode = pdata->mode;
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st->conf = pdata->conf;
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ret = ad7793_set_mode(&st->sd, AD_SD_MODE_IDLE);
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if (ret)
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goto out;
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ret = ad7793_set_channel(&st->sd, 0);
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if (ret)
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goto out;
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ret = ad_sd_write_reg(&st->sd, AD7793_REG_IO,
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sizeof(pdata->io), pdata->io);
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if (ret)
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goto out;
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ret = ad7793_calibrate_all(st);
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if (ret)
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goto out;
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/* Populate available ADC input ranges */
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for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) {
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scale_uv = ((u64)st->int_vref_mv * 100000000)
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>> (st->chip_info->channels[0].scan_type.realbits -
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(!!(st->conf & AD7793_CONF_UNIPOLAR) ? 0 : 1));
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scale_uv >>= i;
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st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10;
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st->scale_avail[i][0] = scale_uv;
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}
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return 0;
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out:
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dev_err(&st->sd.spi->dev, "setup failed\n");
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return ret;
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}
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static const u16 sample_freq_avail[16] = {0, 470, 242, 123, 62, 50, 39, 33, 19,
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17, 16, 12, 10, 8, 6, 4};
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static ssize_t ad7793_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 ad7793_state *st = iio_priv(indio_dev);
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return sprintf(buf, "%d\n",
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sample_freq_avail[AD7793_MODE_RATE(st->mode)]);
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}
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static ssize_t ad7793_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 ad7793_state *st = iio_priv(indio_dev);
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long lval;
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int i, ret;
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mutex_lock(&indio_dev->mlock);
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if (iio_buffer_enabled(indio_dev)) {
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mutex_unlock(&indio_dev->mlock);
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return -EBUSY;
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}
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mutex_unlock(&indio_dev->mlock);
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ret = strict_strtol(buf, 10, &lval);
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if (ret)
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return ret;
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ret = -EINVAL;
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for (i = 0; i < ARRAY_SIZE(sample_freq_avail); i++)
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if (lval == sample_freq_avail[i]) {
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mutex_lock(&indio_dev->mlock);
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st->mode &= ~AD7793_MODE_RATE(-1);
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st->mode |= AD7793_MODE_RATE(i);
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ad_sd_write_reg(&st->sd, AD7793_REG_MODE,
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sizeof(st->mode), st->mode);
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mutex_unlock(&indio_dev->mlock);
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ret = 0;
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}
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return ret ? ret : len;
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}
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static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
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ad7793_read_frequency,
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ad7793_write_frequency);
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static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
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"470 242 123 62 50 39 33 19 17 16 12 10 8 6 4");
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static ssize_t ad7793_show_scale_available(struct device *dev,
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struct device_attribute *attr, 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 ad7793_state *st = iio_priv(indio_dev);
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int i, len = 0;
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for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
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len += sprintf(buf + len, "%d.%09u ", st->scale_avail[i][0],
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st->scale_avail[i][1]);
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len += sprintf(buf + len, "\n");
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return len;
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}
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static IIO_DEVICE_ATTR_NAMED(in_m_in_scale_available,
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in_voltage-voltage_scale_available, S_IRUGO,
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ad7793_show_scale_available, NULL, 0);
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static struct attribute *ad7793_attributes[] = {
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&iio_dev_attr_sampling_frequency.dev_attr.attr,
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&iio_const_attr_sampling_frequency_available.dev_attr.attr,
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&iio_dev_attr_in_m_in_scale_available.dev_attr.attr,
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NULL
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};
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static const struct attribute_group ad7793_attribute_group = {
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.attrs = ad7793_attributes,
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};
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static int ad7793_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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struct ad7793_state *st = iio_priv(indio_dev);
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int ret;
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unsigned long long scale_uv;
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bool unipolar = !!(st->conf & AD7793_CONF_UNIPOLAR);
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switch (m) {
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case IIO_CHAN_INFO_RAW:
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ret = ad_sigma_delta_single_conversion(indio_dev, chan, val);
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if (ret < 0)
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return ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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switch (chan->type) {
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case IIO_VOLTAGE:
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if (chan->differential) {
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*val = st->
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scale_avail[(st->conf >> 8) & 0x7][0];
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*val2 = st->
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scale_avail[(st->conf >> 8) & 0x7][1];
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return IIO_VAL_INT_PLUS_NANO;
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} else {
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/* 1170mV / 2^23 * 6 */
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scale_uv = (1170ULL * 100000000ULL * 6ULL);
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}
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break;
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case IIO_TEMP:
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/* 1170mV / 0.81 mV/C / 2^23 */
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scale_uv = 1444444444444ULL;
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break;
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default:
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return -EINVAL;
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}
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scale_uv >>= (chan->scan_type.realbits - (unipolar ? 0 : 1));
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*val = 0;
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*val2 = scale_uv;
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return IIO_VAL_INT_PLUS_NANO;
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case IIO_CHAN_INFO_OFFSET:
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if (!unipolar)
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*val = -(1 << (chan->scan_type.realbits - 1));
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else
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*val = 0;
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/* Kelvin to Celsius */
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if (chan->type == IIO_TEMP) {
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unsigned long long offset;
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unsigned int shift;
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shift = chan->scan_type.realbits - (unipolar ? 0 : 1);
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offset = 273ULL << shift;
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do_div(offset, 1444);
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*val -= offset;
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}
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return IIO_VAL_INT;
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}
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return -EINVAL;
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}
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static int ad7793_write_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 mask)
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{
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struct ad7793_state *st = iio_priv(indio_dev);
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int ret, i;
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unsigned int tmp;
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mutex_lock(&indio_dev->mlock);
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if (iio_buffer_enabled(indio_dev)) {
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mutex_unlock(&indio_dev->mlock);
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return -EBUSY;
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}
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switch (mask) {
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case IIO_CHAN_INFO_SCALE:
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ret = -EINVAL;
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for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
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if (val2 == st->scale_avail[i][1]) {
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ret = 0;
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tmp = st->conf;
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st->conf &= ~AD7793_CONF_GAIN(-1);
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st->conf |= AD7793_CONF_GAIN(i);
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if (tmp == st->conf)
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break;
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ad_sd_write_reg(&st->sd, AD7793_REG_CONF,
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sizeof(st->conf), st->conf);
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ad7793_calibrate_all(st);
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break;
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}
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break;
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default:
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ret = -EINVAL;
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}
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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 ad7793_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_PLUS_NANO;
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}
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static const struct iio_info ad7793_info = {
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.read_raw = &ad7793_read_raw,
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.write_raw = &ad7793_write_raw,
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.write_raw_get_fmt = &ad7793_write_raw_get_fmt,
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.attrs = &ad7793_attribute_group,
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.validate_trigger = ad_sd_validate_trigger,
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.driver_module = THIS_MODULE,
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};
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#define DECLARE_AD7793_CHANNELS(_name, _b, _sb, _s) \
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const struct iio_chan_spec _name##_channels[] = { \
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AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), (_s)), \
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AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), (_s)), \
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AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), (_s)), \
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AD_SD_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), (_s)), \
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AD_SD_TEMP_CHANNEL(4, AD7793_CH_TEMP, (_b), (_sb), (_s)), \
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AD_SD_SUPPLY_CHANNEL(5, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), (_s)), \
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IIO_CHAN_SOFT_TIMESTAMP(6), \
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}
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#define DECLARE_AD7795_CHANNELS(_name, _b, _sb) \
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const struct iio_chan_spec _name##_channels[] = { \
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AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \
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AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \
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AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \
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AD_SD_DIFF_CHANNEL(3, 3, 3, AD7795_CH_AIN4P_AIN4M, (_b), (_sb), 0), \
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AD_SD_DIFF_CHANNEL(4, 4, 4, AD7795_CH_AIN5P_AIN5M, (_b), (_sb), 0), \
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AD_SD_DIFF_CHANNEL(5, 5, 5, AD7795_CH_AIN6P_AIN6M, (_b), (_sb), 0), \
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AD_SD_SHORTED_CHANNEL(6, 0, AD7795_CH_AIN1M_AIN1M, (_b), (_sb), 0), \
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AD_SD_TEMP_CHANNEL(7, AD7793_CH_TEMP, (_b), (_sb), 0), \
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AD_SD_SUPPLY_CHANNEL(8, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \
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IIO_CHAN_SOFT_TIMESTAMP(9), \
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}
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static DECLARE_AD7793_CHANNELS(ad7785, 20, 32, 4);
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static DECLARE_AD7793_CHANNELS(ad7792, 16, 32, 0);
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static DECLARE_AD7793_CHANNELS(ad7793, 24, 32, 0);
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static DECLARE_AD7795_CHANNELS(ad7794, 16, 32);
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static DECLARE_AD7795_CHANNELS(ad7795, 24, 32);
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static const struct ad7793_chip_info ad7793_chip_info_tbl[] = {
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[ID_AD7785] = {
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.channels = ad7785_channels,
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.num_channels = ARRAY_SIZE(ad7785_channels),
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},
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[ID_AD7792] = {
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.channels = ad7792_channels,
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.num_channels = ARRAY_SIZE(ad7792_channels),
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},
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[ID_AD7793] = {
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.channels = ad7793_channels,
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.num_channels = ARRAY_SIZE(ad7793_channels),
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},
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[ID_AD7794] = {
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.channels = ad7794_channels,
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.num_channels = ARRAY_SIZE(ad7794_channels),
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},
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[ID_AD7795] = {
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.channels = ad7795_channels,
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.num_channels = ARRAY_SIZE(ad7795_channels),
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},
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};
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static int __devinit ad7793_probe(struct spi_device *spi)
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{
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const struct ad7793_platform_data *pdata = spi->dev.platform_data;
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struct ad7793_state *st;
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struct iio_dev *indio_dev;
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int ret, voltage_uv = 0;
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|
|
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");
|