On 05/11/2012 04:53 PM, Lars-Peter Clausen wrote:
> Use extended channel attributes instead of raw sysfs files for the additional
> channel attributes. This allows us to remove some boilerplate code.
One trivial point inline...
>
> Signed-off-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
Acked-by: Jonathan Cameron <jic23@xxxxxxxxxx>
> ---
> drivers/staging/iio/dac/ad5504.c | 164 ++++++++++++++------------------------
> 1 file changed, 58 insertions(+), 106 deletions(-)
>
> diff --git a/drivers/staging/iio/dac/ad5504.c b/drivers/staging/iio/dac/ad5504.c
> index db84d85..07b31f4 100644
> --- a/drivers/staging/iio/dac/ad5504.c
> +++ b/drivers/staging/iio/dac/ad5504.c
> @@ -22,24 +22,6 @@
>
> #include "ad5504.h"
>
> -#define AD5504_CHANNEL(_chan) { \
> - .type = IIO_VOLTAGE, \
> - .indexed = 1, \
> - .output = 1, \
> - .channel = (_chan), \
> - .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
> - IIO_CHAN_INFO_SCALE_SHARED_BIT, \
> - .address = AD5504_ADDR_DAC(_chan), \
> - .scan_type = IIO_ST('u', 12, 16, 0), \
> -}
> -
> -static const struct iio_chan_spec ad5504_channels[] = {
> - AD5504_CHANNEL(0),
> - AD5504_CHANNEL(1),
> - AD5504_CHANNEL(2),
> - AD5504_CHANNEL(3),
> -};
> -
> static int ad5504_spi_write(struct spi_device *spi, u8 addr, u16 val)
> {
> u16 tmp = cpu_to_be16(AD5504_CMD_WRITE |
> @@ -122,65 +104,60 @@ static int ad5504_write_raw(struct iio_dev *indio_dev,
> return -EINVAL;
> }
>
> -static ssize_t ad5504_read_powerdown_mode(struct device *dev,
> - struct device_attribute *attr, char *buf)
> +static const char * const ad5504_powerdown_modes[] = {
> + "20kohm_to_gnd",
> + "three_state",
> +};
> +
> +static int ad5504_get_powerdown_mode(struct iio_dev *indio_dev,
> + const struct iio_chan_spec *chan)
> {
> - struct iio_dev *indio_dev = dev_get_drvdata(dev);
> struct ad5504_state *st = iio_priv(indio_dev);
>
> - const char mode[][14] = {"20kohm_to_gnd", "three_state"};
> -
> - return sprintf(buf, "%s\n", mode[st->pwr_down_mode]);
> + return st->pwr_down_mode;
> }
>
> -static ssize_t ad5504_write_powerdown_mode(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t len)
> +static int ad5504_set_powerdown_mode(struct iio_dev *indio_dev,
> + const struct iio_chan_spec *chan, unsigned int mode)
> {
> - struct iio_dev *indio_dev = dev_get_drvdata(dev);
> struct ad5504_state *st = iio_priv(indio_dev);
> - int ret;
> -
> - if (sysfs_streq(buf, "20kohm_to_gnd"))
> - st->pwr_down_mode = AD5504_DAC_PWRDN_20K;
> - else if (sysfs_streq(buf, "three_state"))
> - st->pwr_down_mode = AD5504_DAC_PWRDN_3STATE;
> - else
> - ret = -EINVAL;
>
> - return ret ? ret : len;
> + st->pwr_down_mode = mode;
blank line here.
> + return 0;
> }
>
> -static ssize_t ad5504_read_dac_powerdown(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> +static const struct iio_enum ad5504_powerdown_mode_enum = {
> + .items = ad5504_powerdown_modes,
> + .num_items = ARRAY_SIZE(ad5504_powerdown_modes),
> + .get = ad5504_get_powerdown_mode,
> + .set = ad5504_set_powerdown_mode,
> +};
> +
> +static ssize_t ad5504_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_get_drvdata(dev);
> struct ad5504_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 & (1 << this_attr->address)));
> + !(st->pwr_down_mask & (1 << chan->channel)));
> }
>
> -static ssize_t ad5504_write_dac_powerdown(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t len)
> +static ssize_t ad5504_write_dac_powerdown(struct iio_dev *indio_dev,
> + uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
> + size_t len)
> {
> long readin;
> int ret;
> - struct iio_dev *indio_dev = dev_get_drvdata(dev);
> struct ad5504_state *st = iio_priv(indio_dev);
> - struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
>
> ret = strict_strtol(buf, 10, &readin);
> if (ret)
> return ret;
>
> if (readin == 0)
> - st->pwr_down_mask |= (1 << this_attr->address);
> + st->pwr_down_mask |= (1 << chan->channel);
> else if (readin == 1)
> - st->pwr_down_mask &= ~(1 << this_attr->address);
> + st->pwr_down_mask &= ~(1 << chan->channel);
> else
> ret = -EINVAL;
>
> @@ -194,50 +171,6 @@ static ssize_t ad5504_write_dac_powerdown(struct device *dev,
> return ret ? ret : len;
> }
>
> -static IIO_DEVICE_ATTR(out_voltage_powerdown_mode, S_IRUGO |
> - S_IWUSR, ad5504_read_powerdown_mode,
> - ad5504_write_powerdown_mode, 0);
> -
> -static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,
> - "20kohm_to_gnd three_state");
> -
> -#define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr) \
> - IIO_DEVICE_ATTR(out_voltage##_num##_powerdown, \
> - S_IRUGO | S_IWUSR, _show, _store, _addr)
> -static IIO_DEV_ATTR_DAC_POWERDOWN(0, ad5504_read_dac_powerdown,
> - ad5504_write_dac_powerdown, 0);
> -static IIO_DEV_ATTR_DAC_POWERDOWN(1, ad5504_read_dac_powerdown,
> - ad5504_write_dac_powerdown, 1);
> -static IIO_DEV_ATTR_DAC_POWERDOWN(2, ad5504_read_dac_powerdown,
> - ad5504_write_dac_powerdown, 2);
> -static IIO_DEV_ATTR_DAC_POWERDOWN(3, ad5504_read_dac_powerdown,
> - ad5504_write_dac_powerdown, 3);
> -
> -static struct attribute *ad5504_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_voltage_powerdown_mode.dev_attr.attr,
> - &iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,
> - NULL,
> -};
> -
> -static const struct attribute_group ad5504_attribute_group = {
> - .attrs = ad5504_attributes,
> -};
> -
> -static struct attribute *ad5501_attributes[] = {
> - &iio_dev_attr_out_voltage0_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 ad5501_attribute_group = {
> - .attrs = ad5501_attributes,
> -};
> -
> static IIO_CONST_ATTR(temp0_thresh_rising_value, "110000");
> static IIO_CONST_ATTR(temp0_thresh_rising_en, "1");
>
> @@ -267,17 +200,38 @@ static irqreturn_t ad5504_event_handler(int irq, void *private)
> static const struct iio_info ad5504_info = {
> .write_raw = ad5504_write_raw,
> .read_raw = ad5504_read_raw,
> - .attrs = &ad5504_attribute_group,
> .event_attrs = &ad5504_ev_attribute_group,
> .driver_module = THIS_MODULE,
> };
>
> -static const struct iio_info ad5501_info = {
> - .write_raw = ad5504_write_raw,
> - .read_raw = ad5504_read_raw,
> - .attrs = &ad5501_attribute_group,
> - .event_attrs = &ad5504_ev_attribute_group,
> - .driver_module = THIS_MODULE,
> +static const struct iio_chan_spec_ext_info ad5504_ext_info[] = {
> + {
> + .name = "powerdown",
> + .read = ad5504_read_dac_powerdown,
> + .write = ad5504_write_dac_powerdown,
> + },
> + IIO_ENUM("powerdown_mode", true, &ad5504_powerdown_mode_enum),
> + IIO_ENUM_AVAILABLE("powerdown_mode", &ad5504_powerdown_mode_enum),
> + { },
> +};
> +
> +#define AD5504_CHANNEL(_chan) { \
> + .type = IIO_VOLTAGE, \
> + .indexed = 1, \
> + .output = 1, \
> + .channel = (_chan), \
> + .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
> + IIO_CHAN_INFO_SCALE_SHARED_BIT, \
> + .address = AD5504_ADDR_DAC(_chan), \
> + .scan_type = IIO_ST('u', 12, 16, 0), \
> + .ext_info = ad5504_ext_info, \
> +}
> +
> +static const struct iio_chan_spec ad5504_channels[] = {
> + AD5504_CHANNEL(0),
> + AD5504_CHANNEL(1),
> + AD5504_CHANNEL(2),
> + AD5504_CHANNEL(3),
> };
>
> static int __devinit ad5504_probe(struct spi_device *spi)
> @@ -315,13 +269,11 @@ static int __devinit ad5504_probe(struct spi_device *spi)
> st->spi = spi;
> indio_dev->dev.parent = &spi->dev;
> indio_dev->name = spi_get_device_id(st->spi)->name;
> - if (spi_get_device_id(st->spi)->driver_data == ID_AD5501) {
> - indio_dev->info = &ad5501_info;
> + indio_dev->info = &ad5504_info;
> + if (spi_get_device_id(st->spi)->driver_data == ID_AD5501)
> indio_dev->num_channels = 1;
> - } else {
> - indio_dev->info = &ad5504_info;
> + else
> indio_dev->num_channels = 4;
> - }
> indio_dev->channels = ad5504_channels;
> indio_dev->modes = INDIO_DIRECT_MODE;
>
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