staging: IIO: DAC: AD5446: Add power down support
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael Hennerich
Greg Kroah-Hartman
parent
bd51c0b078
commit
bbed4dc791
2 changed files with 153 additions and 19 deletions
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@ -48,6 +48,20 @@ static void ad5660_store_sample(struct ad5446_state *st, unsigned val)
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st->data.d24[2] = val & 0xFF;
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}
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static void ad5620_store_pwr_down(struct ad5446_state *st, unsigned mode)
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{
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st->data.d16 = cpu_to_be16(mode << 14);
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}
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static void ad5660_store_pwr_down(struct ad5446_state *st, unsigned mode)
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{
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unsigned val = mode << 16;
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st->data.d24[0] = (val >> 16) & 0xFF;
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st->data.d24[1] = (val >> 8) & 0xFF;
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st->data.d24[2] = val & 0xFF;
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}
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static ssize_t ad5446_write(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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@ -68,6 +82,7 @@ static ssize_t ad5446_write(struct device *dev,
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}
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mutex_lock(&dev_info->mlock);
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st->cached_val = val;
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st->chip_info->store_sample(st, val);
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ret = spi_sync(st->spi, &st->msg);
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mutex_unlock(&dev_info->mlock);
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@ -102,15 +117,119 @@ static ssize_t ad5446_show_name(struct device *dev,
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}
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static IIO_DEVICE_ATTR(name, S_IRUGO, ad5446_show_name, NULL, 0);
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static ssize_t ad5446_write_powerdown_mode(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad5446_state *st = dev_info->dev_data;
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if (sysfs_streq(buf, "1kohm_to_gnd"))
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st->pwr_down_mode = MODE_PWRDWN_1k;
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else if (sysfs_streq(buf, "100kohm_to_gnd"))
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st->pwr_down_mode = MODE_PWRDWN_100k;
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else if (sysfs_streq(buf, "three_state"))
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st->pwr_down_mode = MODE_PWRDWN_TRISTATE;
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else
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return -EINVAL;
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return len;
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}
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static ssize_t ad5446_read_powerdown_mode(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad5446_state *st = dev_info->dev_data;
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char mode[][15] = {"", "1kohm_to_gnd", "100kohm_to_gnd", "three_state"};
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return sprintf(buf, "%s\n", mode[st->pwr_down_mode]);
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}
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static ssize_t ad5446_read_dac_powerdown(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 *dev_info = dev_get_drvdata(dev);
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struct ad5446_state *st = dev_info->dev_data;
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return sprintf(buf, "%d\n", st->pwr_down);
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}
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static ssize_t ad5446_write_dac_powerdown(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad5446_state *st = dev_info->dev_data;
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unsigned long readin;
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int ret;
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ret = strict_strtol(buf, 10, &readin);
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if (ret)
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return ret;
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if (readin > 1)
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ret = -EINVAL;
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mutex_lock(&dev_info->mlock);
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st->pwr_down = readin;
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if (st->pwr_down)
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st->chip_info->store_pwr_down(st, st->pwr_down_mode);
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else
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st->chip_info->store_sample(st, st->cached_val);
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ret = spi_sync(st->spi, &st->msg);
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mutex_unlock(&dev_info->mlock);
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return ret ? ret : len;
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}
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static IIO_DEVICE_ATTR(out_powerdown_mode, S_IRUGO | S_IWUSR,
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ad5446_read_powerdown_mode,
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ad5446_write_powerdown_mode, 0);
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static IIO_CONST_ATTR(out_powerdown_mode_available,
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"1kohm_to_gnd 100kohm_to_gnd three_state");
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static IIO_DEVICE_ATTR(out0_powerdown, S_IRUGO | S_IWUSR,
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ad5446_read_dac_powerdown,
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ad5446_write_dac_powerdown, 0);
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static struct attribute *ad5446_attributes[] = {
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&iio_dev_attr_out0_raw.dev_attr.attr,
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&iio_dev_attr_out_scale.dev_attr.attr,
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&iio_dev_attr_out0_powerdown.dev_attr.attr,
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&iio_dev_attr_out_powerdown_mode.dev_attr.attr,
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&iio_const_attr_out_powerdown_mode_available.dev_attr.attr,
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&iio_dev_attr_name.dev_attr.attr,
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NULL,
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};
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static mode_t ad5446_attr_is_visible(struct kobject *kobj,
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struct attribute *attr, int n)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct iio_dev *dev_info = dev_get_drvdata(dev);
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struct ad5446_state *st = iio_dev_get_devdata(dev_info);
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mode_t mode = attr->mode;
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if (!st->chip_info->store_pwr_down &&
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(attr == &iio_dev_attr_out0_powerdown.dev_attr.attr ||
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attr == &iio_dev_attr_out_powerdown_mode.dev_attr.attr ||
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attr ==
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&iio_const_attr_out_powerdown_mode_available.dev_attr.attr))
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mode = 0;
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return mode;
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}
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static const struct attribute_group ad5446_attribute_group = {
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.attrs = ad5446_attributes,
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.is_visible = ad5446_attr_is_visible,
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};
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static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
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@ -156,6 +275,7 @@ static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
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.left_shift = 2,
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.int_vref_mv = 2500,
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.store_sample = ad5620_store_sample,
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.store_pwr_down = ad5620_store_pwr_down,
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},
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[ID_AD5620_1250] = {
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.bits = 12,
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@ -163,6 +283,7 @@ static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
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.left_shift = 2,
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.int_vref_mv = 1250,
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.store_sample = ad5620_store_sample,
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.store_pwr_down = ad5620_store_pwr_down,
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},
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[ID_AD5640_2500] = {
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.bits = 14,
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@ -170,6 +291,7 @@ static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
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.left_shift = 0,
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.int_vref_mv = 2500,
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.store_sample = ad5620_store_sample,
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.store_pwr_down = ad5620_store_pwr_down,
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},
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[ID_AD5640_1250] = {
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.bits = 14,
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@ -177,6 +299,7 @@ static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
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.left_shift = 0,
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.int_vref_mv = 1250,
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.store_sample = ad5620_store_sample,
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.store_pwr_down = ad5620_store_pwr_down,
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},
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[ID_AD5660_2500] = {
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.bits = 16,
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@ -184,6 +307,7 @@ static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
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.left_shift = 0,
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.int_vref_mv = 2500,
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.store_sample = ad5660_store_sample,
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.store_pwr_down = ad5660_store_pwr_down,
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},
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[ID_AD5660_1250] = {
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.bits = 16,
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@ -191,6 +315,7 @@ static const struct ad5446_chip_info ad5446_chip_info_tbl[] = {
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.left_shift = 0,
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.int_vref_mv = 1250,
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.store_sample = ad5660_store_sample,
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.store_pwr_down = ad5660_store_pwr_down,
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},
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};
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@ -243,20 +368,20 @@ static int __devinit ad5446_probe(struct spi_device *spi)
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spi_message_add_tail(&st->xfer, &st->msg);
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switch (spi_get_device_id(spi)->driver_data) {
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case ID_AD5620_2500:
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case ID_AD5620_1250:
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case ID_AD5640_2500:
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case ID_AD5640_1250:
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case ID_AD5660_2500:
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case ID_AD5660_1250:
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st->vref_mv = st->chip_info->int_vref_mv;
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break;
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default:
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if (voltage_uv)
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st->vref_mv = voltage_uv / 1000;
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else
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dev_warn(&spi->dev,
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"reference voltage unspecified\n");
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case ID_AD5620_2500:
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case ID_AD5620_1250:
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case ID_AD5640_2500:
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case ID_AD5640_1250:
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case ID_AD5660_2500:
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case ID_AD5660_1250:
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st->vref_mv = st->chip_info->int_vref_mv;
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break;
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default:
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if (voltage_uv)
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st->vref_mv = voltage_uv / 1000;
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else
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dev_warn(&spi->dev,
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"reference voltage unspecified\n");
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}
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ret = iio_device_register(st->indio_dev);
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@ -27,6 +27,10 @@
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#define RES_MASK(bits) ((1 << (bits)) - 1)
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#define MODE_PWRDWN_1k 0x1
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#define MODE_PWRDWN_100k 0x2
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#define MODE_PWRDWN_TRISTATE 0x3
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/**
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* struct ad5446_state - driver instance specific data
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* @indio_dev: the industrial I/O device
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@ -47,6 +51,9 @@ struct ad5446_state {
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struct regulator *reg;
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struct work_struct poll_work;
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unsigned short vref_mv;
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unsigned cached_val;
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unsigned pwr_down_mode;
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unsigned pwr_down;
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struct spi_transfer xfer;
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struct spi_message msg;
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union {
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@ -62,14 +69,16 @@ struct ad5446_state {
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* @left_shift: number of bits the datum must be shifted
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* @int_vref_mv: AD5620/40/60: the internal reference voltage
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* @store_sample: chip specific helper function to store the datum
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* @store_sample: chip specific helper function to store the powerpown cmd
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*/
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struct ad5446_chip_info {
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u8 bits;
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u8 storagebits;
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u8 left_shift;
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u16 int_vref_mv;
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void (*store_sample) (struct ad5446_state *st, unsigned val);
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u8 bits;
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u8 storagebits;
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u8 left_shift;
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u16 int_vref_mv;
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void (*store_sample) (struct ad5446_state *st, unsigned val);
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void (*store_pwr_down) (struct ad5446_state *st, unsigned mode);
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};
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/**
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