staging:iio:dac:ad5380: 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>

drivers/staging/iio/dac/ad5380.c

@@ -81,103 +81,18 @@ enum ad5380_type {
 	ID_AD5392_5,
 };
 
-#define AD5380_CHANNEL(_bits) {					\
-	.type = IIO_VOLTAGE,					\
-	.indexed = 1,						\
-	.output = 1,						\
-	.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |		\
-		IIO_CHAN_INFO_SCALE_SHARED_BIT |		\
-		IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT |		\
-		IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,		\
-	.scan_type = IIO_ST('u', (_bits), 16, 14 - (_bits))	\
-}
-
-static const struct ad5380_chip_info ad5380_chip_info_tbl[] = {
-	[ID_AD5380_3] = {
-		.channel_template = AD5380_CHANNEL(14),
-		.num_channels = 40,
-		.int_vref = 1250000,
-	},
-	[ID_AD5380_5] = {
-		.channel_template = AD5380_CHANNEL(14),
-		.num_channels = 40,
-		.int_vref = 2500000,
-	},
-	[ID_AD5381_3] = {
-		.channel_template = AD5380_CHANNEL(12),
-		.num_channels = 16,
-		.int_vref = 1250000,
-	},
-	[ID_AD5381_5] = {
-		.channel_template = AD5380_CHANNEL(12),
-		.num_channels = 16,
-		.int_vref = 2500000,
-	},
-	[ID_AD5382_3] = {
-		.channel_template = AD5380_CHANNEL(14),
-		.num_channels = 32,
-		.int_vref = 1250000,
-	},
-	[ID_AD5382_5] = {
-		.channel_template = AD5380_CHANNEL(14),
-		.num_channels = 32,
-		.int_vref = 2500000,
-	},
-	[ID_AD5383_3] = {
-		.channel_template = AD5380_CHANNEL(12),
-		.num_channels = 32,
-		.int_vref = 1250000,
-	},
-	[ID_AD5383_5] = {
-		.channel_template = AD5380_CHANNEL(12),
-		.num_channels = 32,
-		.int_vref = 2500000,
-	},
-	[ID_AD5390_3] = {
-		.channel_template = AD5380_CHANNEL(14),
-		.num_channels = 16,
-		.int_vref = 1250000,
-	},
-	[ID_AD5390_5] = {
-		.channel_template = AD5380_CHANNEL(14),
-		.num_channels = 16,
-		.int_vref = 2500000,
-	},
-	[ID_AD5391_3] = {
-		.channel_template = AD5380_CHANNEL(12),
-		.num_channels = 16,
-		.int_vref = 1250000,
-	},
-	[ID_AD5391_5] = {
-		.channel_template = AD5380_CHANNEL(12),
-		.num_channels = 16,
-		.int_vref = 2500000,
-	},
-	[ID_AD5392_3] = {
-		.channel_template = AD5380_CHANNEL(14),
-		.num_channels = 8,
-		.int_vref = 1250000,
-	},
-	[ID_AD5392_5] = {
-		.channel_template = AD5380_CHANNEL(14),
-		.num_channels = 8,
-		.int_vref = 2500000,
-	},
-};
-
-static ssize_t ad5380_read_dac_powerdown(struct device *dev,
-	struct device_attribute *attr, char *buf)
+static ssize_t ad5380_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 ad5380_state *st = iio_priv(indio_dev);
 
 	return sprintf(buf, "%d\n", st->pwr_down);
 }
 
-static ssize_t ad5380_write_dac_powerdown(struct device *dev,
-	struct device_attribute *attr, const char *buf, size_t len)
+static ssize_t ad5380_write_dac_powerdown(struct iio_dev *indio_dev,
+	 uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
+	 size_t len)
 {
-	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
 	struct ad5380_state *st = iio_priv(indio_dev);
 	bool pwr_down;
 	int ret;
@@ -200,20 +115,14 @@ static ssize_t ad5380_write_dac_powerdown(struct device *dev,
 	return ret ? ret : len;
 }
 
-static IIO_DEVICE_ATTR(out_voltage_powerdown,
-			S_IRUGO | S_IWUSR,
-			ad5380_read_dac_powerdown,
-			ad5380_write_dac_powerdown, 0);
-
-static const char ad5380_powerdown_modes[][15] = {
-	[0]	= "100kohm_to_gnd",
-	[1]	= "three_state",
+static const char * const ad5380_powerdown_modes[] = {
+	"100kohm_to_gnd",
+	"three_state",
 };
 
-static ssize_t ad5380_read_powerdown_mode(struct device *dev,
-	struct device_attribute *attr, char *buf)
+static int ad5380_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 ad5380_state *st = iio_priv(indio_dev);
 	unsigned int mode;
 	int ret;
@@ -224,49 +133,27 @@ static ssize_t ad5380_read_powerdown_mode(struct device *dev,
 
 	mode = (mode >> AD5380_CTRL_PWR_DOWN_MODE_OFFSET) & 1;
 
-	return sprintf(buf, "%s\n", ad5380_powerdown_modes[mode]);
+	return mode;
 }
 
-static ssize_t ad5380_write_powerdown_mode(struct device *dev,
-	struct device_attribute *attr, const char *buf, size_t len)
+static int ad5380_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 ad5380_state *st = iio_priv(indio_dev);
-	unsigned int i;
 	int ret;
 
-	for (i = 0; i < ARRAY_SIZE(ad5380_powerdown_modes); ++i) {
-		if (sysfs_streq(buf, ad5380_powerdown_modes[i]))
-			break;
-	}
-
-	if (i == ARRAY_SIZE(ad5380_powerdown_modes))
-		return -EINVAL;
-
 	ret = regmap_update_bits(st->regmap, AD5380_REG_SF_CTRL,
 		1 << AD5380_CTRL_PWR_DOWN_MODE_OFFSET,
-		i << AD5380_CTRL_PWR_DOWN_MODE_OFFSET);
+		mode << AD5380_CTRL_PWR_DOWN_MODE_OFFSET);
 
-	return ret ? ret : len;
+	return ret;
 }
 
-static IIO_DEVICE_ATTR(out_voltage_powerdown_mode,
-			S_IRUGO | S_IWUSR,
-			ad5380_read_powerdown_mode,
-			ad5380_write_powerdown_mode, 0);
-
-static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,
-			"100kohm_to_gnd three_state");
-
-static struct attribute *ad5380_attributes[] = {
-	&iio_dev_attr_out_voltage_powerdown.dev_attr.attr,
-	&iio_dev_attr_out_voltage_powerdown_mode.dev_attr.attr,
-	&iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,
-	NULL,
-};
-
-static const struct attribute_group ad5380_attribute_group = {
-	.attrs = ad5380_attributes,
+static const struct iio_enum ad5380_powerdown_mode_enum = {
+	.items = ad5380_powerdown_modes,
+	.num_items = ARRAY_SIZE(ad5380_powerdown_modes),
+	.get = ad5380_get_powerdown_mode,
+	.set = ad5380_set_powerdown_mode,
 };
 
 static unsigned int ad5380_info_to_reg(struct iio_chan_spec const *chan,
@@ -354,10 +241,105 @@ static int ad5380_read_raw(struct iio_dev *indio_dev,
 static const struct iio_info ad5380_info = {
 	.read_raw = ad5380_read_raw,
 	.write_raw = ad5380_write_raw,
-	.attrs = &ad5380_attribute_group,
 	.driver_module = THIS_MODULE,
 };
 
+static struct iio_chan_spec_ext_info ad5380_ext_info[] = {
+	{
+		.name = "powerdown",
+		.read = ad5380_read_dac_powerdown,
+		.write = ad5380_write_dac_powerdown,
+	},
+	IIO_ENUM("powerdown_mode", true, &ad5380_powerdown_mode_enum),
+	IIO_ENUM_AVAILABLE("powerdown_mode", &ad5380_powerdown_mode_enum),
+	{ },
+};
+
+#define AD5380_CHANNEL(_bits) {					\
+	.type = IIO_VOLTAGE,					\
+	.indexed = 1,						\
+	.output = 1,						\
+	.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT |		\
+		IIO_CHAN_INFO_SCALE_SHARED_BIT |		\
+		IIO_CHAN_INFO_CALIBSCALE_SEPARATE_BIT |		\
+		IIO_CHAN_INFO_CALIBBIAS_SEPARATE_BIT,		\
+	.scan_type = IIO_ST('u', (_bits), 16, 14 - (_bits)),	\
+	.ext_info = ad5380_ext_info,				\
+}
+
+static const struct ad5380_chip_info ad5380_chip_info_tbl[] = {
+	[ID_AD5380_3] = {
+		.channel_template = AD5380_CHANNEL(14),
+		.num_channels = 40,
+		.int_vref = 1250000,
+	},
+	[ID_AD5380_5] = {
+		.channel_template = AD5380_CHANNEL(14),
+		.num_channels = 40,
+		.int_vref = 2500000,
+	},
+	[ID_AD5381_3] = {
+		.channel_template = AD5380_CHANNEL(12),
+		.num_channels = 16,
+		.int_vref = 1250000,
+	},
+	[ID_AD5381_5] = {
+		.channel_template = AD5380_CHANNEL(12),
+		.num_channels = 16,
+		.int_vref = 2500000,
+	},
+	[ID_AD5382_3] = {
+		.channel_template = AD5380_CHANNEL(14),
+		.num_channels = 32,
+		.int_vref = 1250000,
+	},
+	[ID_AD5382_5] = {
+		.channel_template = AD5380_CHANNEL(14),
+		.num_channels = 32,
+		.int_vref = 2500000,
+	},
+	[ID_AD5383_3] = {
+		.channel_template = AD5380_CHANNEL(12),
+		.num_channels = 32,
+		.int_vref = 1250000,
+	},
+	[ID_AD5383_5] = {
+		.channel_template = AD5380_CHANNEL(12),
+		.num_channels = 32,
+		.int_vref = 2500000,
+	},
+	[ID_AD5390_3] = {
+		.channel_template = AD5380_CHANNEL(14),
+		.num_channels = 16,
+		.int_vref = 1250000,
+	},
+	[ID_AD5390_5] = {
+		.channel_template = AD5380_CHANNEL(14),
+		.num_channels = 16,
+		.int_vref = 2500000,
+	},
+	[ID_AD5391_3] = {
+		.channel_template = AD5380_CHANNEL(12),
+		.num_channels = 16,
+		.int_vref = 1250000,
+	},
+	[ID_AD5391_5] = {
+		.channel_template = AD5380_CHANNEL(12),
+		.num_channels = 16,
+		.int_vref = 2500000,
+	},
+	[ID_AD5392_3] = {
+		.channel_template = AD5380_CHANNEL(14),
+		.num_channels = 8,
+		.int_vref = 1250000,
+	},
+	[ID_AD5392_5] = {
+		.channel_template = AD5380_CHANNEL(14),
+		.num_channels = 8,
+		.int_vref = 2500000,
+	},
+};
+
 static int __devinit ad5380_alloc_channels(struct iio_dev *indio_dev)
 {
 	struct ad5380_state *st = iio_priv(indio_dev);