On 06/05/2013 05:24 PM, Sebastian Andrzej Siewior wrote: > The TSC part allows to specify the input lines. The IIO part assumes > that it usues always the last few, that means if IIO has adc-channels > set to 2 it will use channel 6 and 7. However it might make sense to use > only 6. > This patch changes the device property (which was introduced recently > and was never in an official release) in a way that the user can specify > which of the AIN lines should be used. In Addition to this, the name is > now AINx where x is the channel number i.e. for AIN6 we would have 6. > Prior this, it always started counting at 0 which is confusing. In > addition to this, it also checks for correct step number during reading > and does not rely on proper FIFO depth. > Looks like a typo below... Also the change that is in doesn't directly seem to be described in this description.
> Acked-by: Jonathan Cameron <[email protected]> > Signed-off-by: Sebastian Andrzej Siewior <[email protected]> > --- > arch/arm/boot/dts/am335x-evm.dts | 2 +- > drivers/iio/adc/ti_am335x_adc.c | 59 > +++++++++++++++++++++++++------------- > drivers/mfd/ti_am335x_tscadc.c | 20 +++++++++++-- > 3 files changed, 58 insertions(+), 23 deletions(-) > > diff --git a/arch/arm/boot/dts/am335x-evm.dts > b/arch/arm/boot/dts/am335x-evm.dts > index 26fea97..0fa4c7f 100644 > --- a/arch/arm/boot/dts/am335x-evm.dts > +++ b/arch/arm/boot/dts/am335x-evm.dts > @@ -255,6 +255,6 @@ > }; > > adc { > - ti,adc-channels = <4>; > + ti,adc-channels = <4 5 6 7>; > }; > }; > diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c > index 031f8e5..4bf34f2 100644 > --- a/drivers/iio/adc/ti_am335x_adc.c > +++ b/drivers/iio/adc/ti_am335x_adc.c > @@ -32,6 +32,8 @@ > struct tiadc_device { > struct ti_tscadc_dev *mfd_tscadc; > int channels; > + u8 channel_line[8]; > + u8 channel_step[8]; > struct iio_map *map; > }; > > @@ -58,7 +60,7 @@ static u32 get_adc_step_mask(struct tiadc_device *adc_dev) > static void tiadc_step_config(struct tiadc_device *adc_dev) > { > unsigned int stepconfig; > - int i, channels = 0, steps; > + int i, steps; > u32 step_en; > > /* > @@ -72,16 +74,18 @@ static void tiadc_step_config(struct tiadc_device > *adc_dev) > */ > > steps = TOTAL_STEPS - adc_dev->channels; > - channels = TOTAL_CHANNELS - adc_dev->channels; > - > stepconfig = STEPCONFIG_AVG_16 | STEPCONFIG_FIFO1; > > - for (i = steps; i < TOTAL_STEPS; i++) { > - tiadc_writel(adc_dev, REG_STEPCONFIG(i), > - stepconfig | STEPCONFIG_INP(channels)); > - tiadc_writel(adc_dev, REG_STEPDELAY(i), > + for (i = 0; i < adc_dev->channels; i++) { > + int chan; > + > + chan = adc_dev->channel_line[i]; > + tiadc_writel(adc_dev, REG_STEPCONFIG(steps), > + stepconfig | STEPCONFIG_INP(chan)); > + tiadc_writel(adc_dev, REG_STEPDELAY(steps), > STEPCONFIG_OPENDLY); > - channels++; > + adc_dev->channel_step[i] = steps; > + steps++; > } > step_en = get_adc_step_mask(adc_dev); > am335x_tsc_se_set(adc_dev->mfd_tscadc, step_en); > @@ -116,9 +120,9 @@ static int tiadc_channel_init(struct iio_dev *indio_dev, > int channels) > > chan->type = IIO_VOLTAGE; > chan->indexed = 1; > - chan->channel = i; > + chan->channel = adc_dev->channel_line[i]; > chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); > - chan->datasheet_name = chan_name_ain[i]; > + chan->datasheet_name = chan_name_ain[chan->channel]; > chan->scan_type.sign = 'u'; > chan->scan_type.realbits = 12; > chan->scan_type.storagebits = 32; > @@ -165,7 +169,8 @@ static int tiadc_read_raw(struct iio_dev *indio_dev, > { > struct tiadc_device *adc_dev = iio_priv(indio_dev); > int i; > - unsigned int fifo1count, readx1; > + unsigned int fifo1count, read; > + u32 step = UINT_MAX; > > /* > * When the sub-system is first enabled, > @@ -178,11 +183,20 @@ static int tiadc_read_raw(struct iio_dev *indio_dev, > * Hence we need to flush out this data. > */ > > + for (i = 0; i < ARRAY_SIZE(adc_dev->channel_step); i++) { > + if (chan->channel == adc_dev->channel_line[i]) { > + step = adc_dev->channel_step[i]; > + break; > + } > + } > + if (WARN_ON_ONCE(step == UINT_MAX)) > + return -EINVAL; > + > fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT); > for (i = 0; i < fifo1count; i++) { > - readx1 = tiadc_readl(adc_dev, REG_FIFO1); > - if (i == chan->channel) > - *val = readx1 & 0xfff; > + read = tiadc_readl(adc_dev, REG_FIFO1); > + if (read >> 16 == step) > + *val = read & 0xfff; > } > am335x_tsc_se_update(adc_dev->mfd_tscadc); > > @@ -199,8 +213,11 @@ static int tiadc_probe(struct platform_device *pdev) > struct tiadc_device *adc_dev; > struct ti_tscadc_dev *tscadc_dev = ti_tscadc_dev_get(pdev); > struct device_node *node = tscadc_dev->dev->of_node; > + struct property *prop; > + const __be32 *cur; > int err; > - u32 val32; > + u32 val; > + int channels = 0; > > if (!node) { > dev_err(&pdev->dev, "Could not find valid DT data.\n"); > @@ -222,11 +239,13 @@ static int tiadc_probe(struct platform_device *pdev) > err = -EINVAL; > goto err_free_device; > } > - err = of_property_read_u32(node, > - "ti,adc-channels", &val32); > - if (err < 0) > - goto err_free_device; > - adc_dev->channels = val32; > + > + of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) { > + > + adc_dev->channel_line[channels] = val; > + channels++; > + } > + adc_dev->channels = channels; > > indio_dev->dev.parent = &pdev->dev; > indio_dev->name = dev_name(&pdev->dev); > diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c > index 8bdab8d..acdb7b9 100644 > --- a/drivers/mfd/ti_am335x_tscadc.c > +++ b/drivers/mfd/ti_am335x_tscadc.c > @@ -80,9 +80,13 @@ static int ti_tscadc_probe(struct platform_device > *pdev) > struct clk *clk; > struct device_node *node = pdev->dev.of_node; > struct mfd_cell *cell; > + struct property *prop; > + const __be32 *cur; > + u32 val; > int err, ctrl; > int clk_value, clock_rate; > int tsc_wires = 0, adc_channels = 0, total_channels; > + int readouts = 0; > > if (!pdev->dev.of_node) { > dev_err(&pdev->dev, "Could not find valid DT data.\n"); > @@ -91,10 +95,17 @@ static int ti_tscadc_probe(struct platform_device > *pdev) > > node = of_get_child_by_name(pdev->dev.of_node, "tsc"); > of_property_read_u32(node, "ti,wires", &tsc_wires); > + of_property_read_u32(node, "ti,coordiante-readouts", &readouts); Coordiante? I'm guessing coordinate > > node = of_get_child_by_name(pdev->dev.of_node, "adc"); > - of_property_read_u32(node, "ti,adc-channels", &adc_channels); > - > + of_property_for_each_u32(node, "ti,adc-channels", prop, cur, val) { > + adc_channels++; > + if (val > 7) { > + dev_err(&pdev->dev, " PIN numbers are 0..7 (not %d)\n", > + val); > + return -EINVAL; > + } > + } > total_channels = tsc_wires + adc_channels; > if (total_channels > 8) { > dev_err(&pdev->dev, "Number of i/p channels more than 8\n"); > @@ -105,6 +116,11 @@ static int ti_tscadc_probe(struct platform_device > *pdev) > return -EINVAL; > } > > + if (readouts * 2 + 2 + adc_channels > 16) { > + dev_err(&pdev->dev, "Too many step configurations requested\n"); > + return -EINVAL; > + } > + > res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > if (!res) { > dev_err(&pdev->dev, "no memory resource defined.\n"); > -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
