staging:iio:dac:ad5064: Convert to extended channel info attributes

Use extended channel info attributes for the powerdown, powerdown_mode and
powerdown_mode_available attributes.

Note that this patch moves the chip info defintion around to avoid having to use
forward declarations for the extended channel info attributes callbacks.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/iio/dac/ad5064.c b/drivers/staging/iio/dac/ad5064.c
index 049a855039c2b8e1c1ca9c1f122eee316236767a..52fef75b82d753a8ecf92f4cbc54825680215a8b 100644 (file)
--- a/drivers/staging/iio/dac/ad5064.c
+++ b/drivers/staging/iio/dac/ad5064.c
@@ -86,47 +86,6 @@ enum ad5064_type {
        ID_AD5064_1,
 };
 
-#define AD5064_CHANNEL(chan, bits) {                           \
-       .type = IIO_VOLTAGE,                                    \
-       .indexed = 1,                                           \
-       .output = 1,                                            \
-       .channel = (chan),                                      \
-       .info_mask = IIO_CHAN_INFO_SCALE_SEPARATE_BIT,  \
-       .address = AD5064_ADDR_DAC(chan),                       \
-       .scan_type = IIO_ST('u', (bits), 16, 20 - (bits))       \
-}
-
-static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
-       [ID_AD5024] = {
-               .shared_vref = false,
-               .channel[0] = AD5064_CHANNEL(0, 12),
-               .channel[1] = AD5064_CHANNEL(1, 12),
-               .channel[2] = AD5064_CHANNEL(2, 12),
-               .channel[3] = AD5064_CHANNEL(3, 12),
-       },
-       [ID_AD5044] = {
-               .shared_vref = false,
-               .channel[0] = AD5064_CHANNEL(0, 14),
-               .channel[1] = AD5064_CHANNEL(1, 14),
-               .channel[2] = AD5064_CHANNEL(2, 14),
-               .channel[3] = AD5064_CHANNEL(3, 14),
-       },
-       [ID_AD5064] = {
-               .shared_vref = false,
-               .channel[0] = AD5064_CHANNEL(0, 16),
-               .channel[1] = AD5064_CHANNEL(1, 16),
-               .channel[2] = AD5064_CHANNEL(2, 16),
-               .channel[3] = AD5064_CHANNEL(3, 16),
-       },
-       [ID_AD5064_1] = {
-               .shared_vref = true,
-               .channel[0] = AD5064_CHANNEL(0, 16),
-               .channel[1] = AD5064_CHANNEL(1, 16),
-               .channel[2] = AD5064_CHANNEL(2, 16),
-               .channel[3] = AD5064_CHANNEL(3, 16),
-       },
-};
-
 static int ad5064_spi_write(struct ad5064_state *st, unsigned int cmd,
        unsigned int addr, unsigned int val, unsigned int shift)
 {
@@ -160,22 +119,25 @@ static const char ad5064_powerdown_modes[][15] = {
        [AD5064_LDAC_PWRDN_3STATE]      = "three_state",
 };
 
-static ssize_t ad5064_read_powerdown_mode(struct device *dev,
-       struct device_attribute *attr, char *buf)
+static ssize_t ad5064_read_powerdown_mode_available(struct iio_dev *indio_dev,
+       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,
+       const struct iio_chan_spec *chan, char *buf)
 {
-       struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-       struct iio_dev *indio_dev = dev_get_drvdata(dev);
        struct ad5064_state *st = iio_priv(indio_dev);
 
        return sprintf(buf, "%s\n",
-               ad5064_powerdown_modes[st->pwr_down_mode[this_attr->address]]);
+               ad5064_powerdown_modes[st->pwr_down_mode[chan->channel]]);
 }
 
-static ssize_t ad5064_write_powerdown_mode(struct device *dev,
-       struct device_attribute *attr, const char *buf, size_t len)
+static ssize_t ad5064_write_powerdown_mode(struct iio_dev *indio_dev,
+       const struct iio_chan_spec *chan, const char *buf, size_t len)
 {
-       struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-       struct iio_dev *indio_dev = dev_get_drvdata(dev);
        struct ad5064_state *st = iio_priv(indio_dev);
        unsigned int mode, i;
        int ret;
@@ -192,31 +154,26 @@ static ssize_t ad5064_write_powerdown_mode(struct device *dev,
                return  -EINVAL;
 
        mutex_lock(&indio_dev->mlock);
-       st->pwr_down_mode[this_attr->address] = mode;
+       st->pwr_down_mode[chan->channel] = mode;
 
-       ret = ad5064_sync_powerdown_mode(st, this_attr->address);
+       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 device *dev,
-                                          struct device_attribute *attr,
-                                          char *buf)
+static ssize_t ad5064_read_dac_powerdown(struct iio_dev *indio_dev,
+       const struct iio_chan_spec *chan, char *buf)
 {
-       struct iio_dev *indio_dev = dev_get_drvdata(dev);
        struct ad5064_state *st = iio_priv(indio_dev);
-       struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 
-       return sprintf(buf, "%d\n", st->pwr_down[this_attr->address]);
+       return sprintf(buf, "%d\n", st->pwr_down[chan->channel]);
 }
 
-static ssize_t ad5064_write_dac_powerdown(struct device *dev,
-       struct device_attribute *attr, const char *buf, size_t len)
+static ssize_t ad5064_write_dac_powerdown(struct iio_dev *indio_dev,
+       const struct iio_chan_spec *chan, const char *buf, size_t len)
 {
-       struct iio_dev *indio_dev = dev_get_drvdata(dev);
        struct ad5064_state *st = iio_priv(indio_dev);
-       struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
        bool pwr_down;
        int ret;
 
@@ -225,54 +182,13 @@ static ssize_t ad5064_write_dac_powerdown(struct device *dev,
                return ret;
 
        mutex_lock(&indio_dev->mlock);
-       st->pwr_down[this_attr->address] = pwr_down;
+       st->pwr_down[chan->channel] = pwr_down;
 
-       ret = ad5064_sync_powerdown_mode(st, this_attr->address);
+       ret = ad5064_sync_powerdown_mode(st, chan->channel);
        mutex_unlock(&indio_dev->mlock);
        return ret ? ret : len;
 }
 
-static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,
-                       "1kohm_to_gnd 100kohm_to_gnd three_state");
-
-#define IIO_DEV_ATTR_DAC_POWERDOWN_MODE(_chan) \
-       IIO_DEVICE_ATTR(out_voltage##_chan##_powerdown_mode, \
-                       S_IRUGO | S_IWUSR, \
-                       ad5064_read_powerdown_mode, \
-                       ad5064_write_powerdown_mode, _chan);
-
-#define IIO_DEV_ATTR_DAC_POWERDOWN(_chan)                              \
-       IIO_DEVICE_ATTR(out_voltage##_chan##_powerdown,                 \
-                       S_IRUGO | S_IWUSR,                              \
-                       ad5064_read_dac_powerdown,                      \
-                       ad5064_write_dac_powerdown, _chan)
-
-static IIO_DEV_ATTR_DAC_POWERDOWN(0);
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(0);
-static IIO_DEV_ATTR_DAC_POWERDOWN(1);
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(1);
-static IIO_DEV_ATTR_DAC_POWERDOWN(2);
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(2);
-static IIO_DEV_ATTR_DAC_POWERDOWN(3);
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(3);
-
-static struct attribute *ad5064_attributes[] = {
-       &iio_dev_attr_out_voltage0_powerdown.dev_attr.attr,
-       &iio_dev_attr_out_voltage1_powerdown.dev_attr.attr,
-       &iio_dev_attr_out_voltage2_powerdown.dev_attr.attr,
-       &iio_dev_attr_out_voltage3_powerdown.dev_attr.attr,
-       &iio_dev_attr_out_voltage0_powerdown_mode.dev_attr.attr,
-       &iio_dev_attr_out_voltage1_powerdown_mode.dev_attr.attr,
-       &iio_dev_attr_out_voltage2_powerdown_mode.dev_attr.attr,
-       &iio_dev_attr_out_voltage3_powerdown_mode.dev_attr.attr,
-       &iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,
-       NULL,
-};
-
-static const struct attribute_group ad5064_attribute_group = {
-       .attrs = ad5064_attributes,
-};
-
 static int ad5064_read_raw(struct iio_dev *indio_dev,
                           struct iio_chan_spec const *chan,
                           int *val,
@@ -331,10 +247,70 @@ static int ad5064_write_raw(struct iio_dev *indio_dev,
 static const struct iio_info ad5064_info = {
        .read_raw = ad5064_read_raw,
        .write_raw = ad5064_write_raw,
-       .attrs = &ad5064_attribute_group,
        .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_SCALE_SEPARATE_BIT,  \
+       .address = AD5064_ADDR_DAC(chan),                       \
+       .scan_type = IIO_ST('u', (bits), 16, 20 - (bits)),      \
+       .ext_info = ad5064_ext_info,                            \
+}
+
+static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
+       [ID_AD5024] = {
+               .shared_vref = false,
+               .channel[0] = AD5064_CHANNEL(0, 12),
+               .channel[1] = AD5064_CHANNEL(1, 12),
+               .channel[2] = AD5064_CHANNEL(2, 12),
+               .channel[3] = AD5064_CHANNEL(3, 12),
+       },
+       [ID_AD5044] = {
+               .shared_vref = false,
+               .channel[0] = AD5064_CHANNEL(0, 14),
+               .channel[1] = AD5064_CHANNEL(1, 14),
+               .channel[2] = AD5064_CHANNEL(2, 14),
+               .channel[3] = AD5064_CHANNEL(3, 14),
+       },
+       [ID_AD5064] = {
+               .shared_vref = false,
+               .channel[0] = AD5064_CHANNEL(0, 16),
+               .channel[1] = AD5064_CHANNEL(1, 16),
+               .channel[2] = AD5064_CHANNEL(2, 16),
+               .channel[3] = AD5064_CHANNEL(3, 16),
+       },
+       [ID_AD5064_1] = {
+               .shared_vref = true,
+               .channel[0] = AD5064_CHANNEL(0, 16),
+               .channel[1] = AD5064_CHANNEL(1, 16),
+               .channel[2] = AD5064_CHANNEL(2, 16),
+               .channel[3] = AD5064_CHANNEL(3, 16),
+       },
+};
+
 static inline unsigned int ad5064_num_vref(struct ad5064_state *st)
 {
        return st->chip_info->shared_vref ? 1 : AD5064_DAC_CHANNELS;