staging:iio:dac:ad5686: Convert to extended channel attributes

Use extended channel attributes instead of raw sysfs files for the additional
channel attributes. This allows us to remove some boilerplate code.

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>

1 files changed, 80 insertions, 116 deletions

diff --git a/drivers/staging/iio/dac/ad5686.c b/drivers/staging/iio/dac/ad5686.c
index c1e903ebc7b..f07e19721c9 100644
--- a/drivers/staging/iio/dac/ad5686.c
+++ b/drivers/staging/iio/dac/ad5686.c
@@ -93,40 +93,6 @@ enum ad5686_supported_device_ids {
         ID_AD5685,
         ID_AD5686,
 };
-#define AD5868_CHANNEL(chan, bits, shift) {                     \
-                .type = IIO_VOLTAGE,                            \
-                .indexed = 1,                                   \
-                .output = 1,                                    \
-                .channel = chan,                                \
-                .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |   \
-                IIO_CHAN_INFO_SCALE_SHARED_BIT,                 \
-                .address = AD5686_ADDR_DAC(chan),                       \
-                .scan_type = IIO_ST('u', bits, 16, shift)       \
-}
-static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
-        [ID_AD5684] = {
-                .channel[0] = AD5868_CHANNEL(0, 12, 4),
-                .channel[1] = AD5868_CHANNEL(1, 12, 4),
-                .channel[2] = AD5868_CHANNEL(2, 12, 4),
-                .channel[3] = AD5868_CHANNEL(3, 12, 4),
-                .int_vref_mv = 2500,
-        },
-        [ID_AD5685] = {
-                .channel[0] = AD5868_CHANNEL(0, 14, 2),
-                .channel[1] = AD5868_CHANNEL(1, 14, 2),
-                .channel[2] = AD5868_CHANNEL(2, 14, 2),
-                .channel[3] = AD5868_CHANNEL(3, 14, 2),
-                .int_vref_mv = 2500,
-        },
-        [ID_AD5686] = {
-                .channel[0] = AD5868_CHANNEL(0, 16, 0),
-                .channel[1] = AD5868_CHANNEL(1, 16, 0),
-                .channel[2] = AD5868_CHANNEL(2, 16, 0),
-                .channel[3] = AD5868_CHANNEL(3, 16, 0),
-                .int_vref_mv = 2500,
-        },
-};
-
 static int ad5686_spi_write(struct ad5686_state *st,
                              u8 cmd, u8 addr, u16 val, u8 shift)
 {
@@ -170,73 +136,63 @@ static int ad5686_spi_read(struct ad5686_state *st, u8 addr)
         return be32_to_cpu(st->data[2].d32);
 }
 
-static ssize_t ad5686_read_powerdown_mode(struct device *dev,
-                                      struct device_attribute *attr, char *buf)
+static const char * const ad5686_powerdown_modes[] = {
+        "1kohm_to_gnd",
+        "100kohm_to_gnd",
+        "three_state"
+};
+
+static int ad5686_get_powerdown_mode(struct iio_dev *indio_dev,
+        const struct iio_chan_spec *chan)
 {
-        struct iio_dev *indio_dev = dev_to_iio_dev(dev);
         struct ad5686_state *st = iio_priv(indio_dev);
-        struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 
-        char mode[][15] = {"", "1kohm_to_gnd", "100kohm_to_gnd", "three_state"};
-
-        return sprintf(buf, "%s\n", mode[(st->pwr_down_mode >>
-                                         (this_attr->address * 2)) & 0x3]);
+        return ((st->pwr_down_mode >> (chan->channel * 2)) & 0x3) - 1;
 }
 
-static ssize_t ad5686_write_powerdown_mode(struct device *dev,
-                                       struct device_attribute *attr,
-                                       const char *buf, size_t len)
+static int ad5686_set_powerdown_mode(struct iio_dev *indio_dev,
+        const struct iio_chan_spec *chan, unsigned int mode)
 {
-        struct iio_dev *indio_dev = dev_to_iio_dev(dev);
         struct ad5686_state *st = iio_priv(indio_dev);
-        struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
-        unsigned mode;
-
-        if (sysfs_streq(buf, "1kohm_to_gnd"))
-                mode = AD5686_LDAC_PWRDN_1K;
-        else if (sysfs_streq(buf, "100kohm_to_gnd"))
-                mode = AD5686_LDAC_PWRDN_100K;
-        else if (sysfs_streq(buf, "three_state"))
-                mode = AD5686_LDAC_PWRDN_3STATE;
-        else
-                return  -EINVAL;
 
-        st->pwr_down_mode &= ~(0x3 << (this_attr->address * 2));
-        st->pwr_down_mode |= (mode << (this_attr->address * 2));
+        st->pwr_down_mode &= ~(0x3 << (chan->channel * 2));
+        st->pwr_down_mode |= ((mode + 1) << (chan->channel * 2));
 
-        return len;
+        return 0;
 }
 
-static ssize_t ad5686_read_dac_powerdown(struct device *dev,
-                                           struct device_attribute *attr,
-                                           char *buf)
+static const struct iio_enum ad5686_powerdown_mode_enum = {
+        .items = ad5686_powerdown_modes,
+        .num_items = ARRAY_SIZE(ad5686_powerdown_modes),
+        .get = ad5686_get_powerdown_mode,
+        .set = ad5686_set_powerdown_mode,
+};
+
+static ssize_t ad5686_read_dac_powerdown(struct iio_dev *indio_dev,
+        uintptr_t private, const struct iio_chan_spec *chan, char *buf)
 {
-        struct iio_dev *indio_dev = dev_to_iio_dev(dev);
         struct ad5686_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_mask &
-                        (0x3 << (this_attr->address * 2))));
+                        (0x3 << (chan->channel * 2))));
 }
 
-static ssize_t ad5686_write_dac_powerdown(struct device *dev,
-                                            struct device_attribute *attr,
-                                            const char *buf, size_t len)
+static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
+         uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
+         size_t len)
 {
         bool readin;
         int ret;
-        struct iio_dev *indio_dev = dev_to_iio_dev(dev);
         struct ad5686_state *st = iio_priv(indio_dev);
-        struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
 
         ret = strtobool(buf, &readin);
         if (ret)
                 return ret;
 
         if (readin == true)
-                st->pwr_down_mask |= (0x3 << (this_attr->address * 2));
+                st->pwr_down_mask |= (0x3 << (chan->channel * 2));
         else
-                st->pwr_down_mask &= ~(0x3 << (this_attr->address * 2));
+                st->pwr_down_mask &= ~(0x3 << (chan->channel * 2));
 
         ret = ad5686_spi_write(st, AD5686_CMD_POWERDOWN_DAC, 0,
                                st->pwr_down_mask & st->pwr_down_mode, 0);
@@ -244,48 +200,6 @@ static ssize_t ad5686_write_dac_powerdown(struct device *dev,
         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(_num)                           \
-        IIO_DEVICE_ATTR(out_voltage##_num##_powerdown_mode,             \
-                        S_IRUGO | S_IWUSR,                              \
-                        ad5686_read_powerdown_mode,                     \
-                        ad5686_write_powerdown_mode, _num)
-
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(0);
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(1);
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(2);
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(3);
-
-#define IIO_DEV_ATTR_DAC_POWERDOWN(_num)                                \
-        IIO_DEVICE_ATTR(out_voltage##_num##_powerdown,                  \
-                        S_IRUGO | S_IWUSR,                              \
-                        ad5686_read_dac_powerdown,                      \
-                        ad5686_write_dac_powerdown, _num)
-
-static IIO_DEV_ATTR_DAC_POWERDOWN(0);
-static IIO_DEV_ATTR_DAC_POWERDOWN(1);
-static IIO_DEV_ATTR_DAC_POWERDOWN(2);
-static IIO_DEV_ATTR_DAC_POWERDOWN(3);
-
-static struct attribute *ad5686_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 ad5686_attribute_group = {
-        .attrs = ad5686_attributes,
-};
-
 static int ad5686_read_raw(struct iio_dev *indio_dev,
                            struct iio_chan_spec const *chan,
                            int *val,
@@ -349,10 +263,57 @@ static int ad5686_write_raw(struct iio_dev *indio_dev,
 static const struct iio_info ad5686_info = {
         .read_raw = ad5686_read_raw,
         .write_raw = ad5686_write_raw,
-        .attrs = &ad5686_attribute_group,
         .driver_module = THIS_MODULE,
 };
 
+static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
+        {
+                .name = "powerdown",
+                .read = ad5686_read_dac_powerdown,
+                .write = ad5686_write_dac_powerdown,
+        },
+        IIO_ENUM("powerdown_mode", false, &ad5686_powerdown_mode_enum),
+        IIO_ENUM_AVAILABLE("powerdown_mode", &ad5686_powerdown_mode_enum),
+        { },
+};
+
+#define AD5868_CHANNEL(chan, bits, shift) {                     \
+                .type = IIO_VOLTAGE,                            \
+                .indexed = 1,                                   \
+                .output = 1,                                    \
+                .channel = chan,                                \
+                .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |   \
+                IIO_CHAN_INFO_SCALE_SHARED_BIT,                 \
+                .address = AD5686_ADDR_DAC(chan),                       \
+                .scan_type = IIO_ST('u', bits, 16, shift),      \
+                .ext_info = ad5686_ext_info,                    \
+}
+
+static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
+        [ID_AD5684] = {
+                .channel[0] = AD5868_CHANNEL(0, 12, 4),
+                .channel[1] = AD5868_CHANNEL(1, 12, 4),
+                .channel[2] = AD5868_CHANNEL(2, 12, 4),
+                .channel[3] = AD5868_CHANNEL(3, 12, 4),
+                .int_vref_mv = 2500,
+        },
+        [ID_AD5685] = {
+                .channel[0] = AD5868_CHANNEL(0, 14, 2),
+                .channel[1] = AD5868_CHANNEL(1, 14, 2),
+                .channel[2] = AD5868_CHANNEL(2, 14, 2),
+                .channel[3] = AD5868_CHANNEL(3, 14, 2),
+                .int_vref_mv = 2500,
+        },
+        [ID_AD5686] = {
+                .channel[0] = AD5868_CHANNEL(0, 16, 0),
+                .channel[1] = AD5868_CHANNEL(1, 16, 0),
+                .channel[2] = AD5868_CHANNEL(2, 16, 0),
+                .channel[3] = AD5868_CHANNEL(3, 16, 0),
+                .int_vref_mv = 2500,
+        },
+};
+
+
 static int __devinit ad5686_probe(struct spi_device *spi)
 {
         struct ad5686_state *st;
@@ -385,6 +346,9 @@ static int __devinit ad5686_probe(struct spi_device *spi)
 
         st->spi = spi;
 
+        /* Set all the power down mode for all channels to 1K pulldown */
+        st->pwr_down_mode = 0x55;
+
         indio_dev->dev.parent = &spi->dev;
         indio_dev->name = spi_get_device_id(spi)->name;
         indio_dev->info = &ad5686_info;