On 11/01/2012 04:24 PM, Pantelis Antoniou wrote:
> Add an IIO map interface that consumers can use.
Hi,
Looks like you overlooked the review comments I had inline last time. I've
put them in again, see below.
>
> Signed-off-by: Pantelis Antoniou <panto@xxxxxxxxxxxxxxxxxxxxxxx>
> ---
> drivers/iio/adc/ti_am335x_adc.c | 60 +++++++++++++++++++++++++++++++++--------
> 1 file changed, 49 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
> index 02a43c8..8595a90 100644
> --- a/drivers/iio/adc/ti_am335x_adc.c
> +++ b/drivers/iio/adc/ti_am335x_adc.c
> @@ -20,8 +20,9 @@
> #include <linux/slab.h>
> #include <linux/interrupt.h>
> #include <linux/platform_device.h>
> -#include <linux/io.h>
> #include <linux/iio/iio.h>
> +#include <linux/iio/machine.h>
> +#include <linux/iio/driver.h>
>
> #include <linux/mfd/ti_am335x_tscadc.h>
> #include <linux/platform_data/ti_am335x_adc.h>
> @@ -29,6 +30,8 @@
> struct tiadc_device {
> struct ti_tscadc_dev *mfd_tscadc;
> int channels;
> + char *buf;
buf doesn't seem to be used anywhere
> + struct iio_map *map;
> };
>
> static unsigned int tiadc_readl(struct tiadc_device *adc, unsigned int reg)
> @@ -72,27 +75,62 @@ static void tiadc_step_config(struct tiadc_device *adc_dev)
> tiadc_writel(adc_dev, REG_SE, STPENB_STEPENB);
> }
>
> -static int tiadc_channel_init(struct iio_dev *indio_dev, int channels)
> +static int tiadc_channel_init(struct iio_dev *indio_dev,
> + struct tiadc_device *adc_dev)
> {
> struct iio_chan_spec *chan_array;
> - int i;
> -
> - indio_dev->num_channels = channels;
> - chan_array = kcalloc(indio_dev->num_channels,
> - sizeof(struct iio_chan_spec), GFP_KERNEL);
> + struct iio_chan_spec *chan;
> + char *s;
> + int i, len, size, ret;
> + int channels = adc_dev->channels;
>
> + size = channels * (sizeof(struct iio_chan_spec) + 6);
> + chan_array = kzalloc(size, GFP_KERNEL);
> if (chan_array == NULL)
> return -ENOMEM;
>
> - for (i = 0; i < (indio_dev->num_channels); i++) {
> - struct iio_chan_spec *chan = chan_array + i;
> + /* buffer space is after the array */
> + s = (char *)(chan_array + channels);
> + chan = chan_array;
> + for (i = 0; i < channels; i++, chan++, s += len + 1) {
> +
> + len = sprintf(s, "AIN%d", i);
> +
> chan->type = IIO_VOLTAGE;
> chan->indexed = 1;
> chan->channel = i;
> - chan->info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT;
> + chan->datasheet_name = s;
> + chan->scan_type.sign = 'u';
> + chan->scan_type.realbits = 12;
> + chan->scan_type.storagebits = 32;
> + chan->scan_type.shift = 0;
The scan type assignment should go in a separate patch if possible.
> }
>
> indio_dev->channels = chan_array;
> + indio_dev->num_channels = channels;
> +
> + size = (channels + 1) * sizeof(struct iio_map);
> + adc_dev->map = kzalloc(size, GFP_KERNEL);
> + if (adc_dev->map == NULL) {
> + kfree(chan_array);
> + return -ENOMEM;
> + }
> +
> + for (i = 0; i < indio_dev->num_channels; i++) {
> + adc_dev->map[i].adc_channel_label = chan_array[i].datasheet_name;
> + adc_dev->map[i].consumer_dev_name = "any";
> + adc_dev->map[i].consumer_channel = chan_array[i].datasheet_name;
> + }
> + adc_dev->map[i].adc_channel_label = NULL;
> + adc_dev->map[i].consumer_dev_name = NULL;
> + adc_dev->map[i].consumer_channel = NULL;
The map should be passed in via platform data or similar. All the fields of
the map depend on the specific user, so you can't use a generic map. In fact
if we were able to use a generic map, we wouldn't need a map at all.
> +
> + ret = iio_map_array_register(indio_dev, adc_dev->map);
> + if (ret != 0) {
> + kfree(adc_dev->map);
> + kfree(chan_array);
> + return -ENOMEM;
> + }
>
> return indio_dev->num_channels;
> }
> @@ -168,7 +206,7 @@ static int __devinit tiadc_probe(struct platform_device *pdev)
>
> tiadc_step_config(adc_dev);
>
> - err = tiadc_channel_init(indio_dev, adc_dev->channels);
> + err = tiadc_channel_init(indio_dev, adc_dev);
> if (err < 0)
> goto err_free_device;
>
--
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