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iio: mxs-lradc: add scale_available file to channels
Adds in_voltageX_scale_available file for every channel to read the different available scales. There are two scales per channel: [0] = divider_by_two disabled (default) [1] = divider_by_two enabled The scale is a struct made of integer and nano parts to build a long decimal number. Signed-off-by: Hector Palacios <hector.palacios@digi.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Acked-by: Marek Vasut <marex@denx.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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f6db68a405
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1 changed files with 105 additions and 1 deletions
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@ -38,6 +38,7 @@
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#include <linux/clk.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/trigger_consumer.h>
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@ -184,6 +185,11 @@ enum lradc_ts_plate {
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LRADC_SAMPLE_VALID,
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};
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struct mxs_lradc_scale {
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unsigned int integer;
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unsigned int nano;
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};
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struct mxs_lradc {
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struct device *dev;
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void __iomem *base;
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@ -199,6 +205,7 @@ struct mxs_lradc {
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struct completion completion;
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const uint32_t *vref_mv;
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struct mxs_lradc_scale scale_avail[LRADC_MAX_TOTAL_CHANS][2];
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/*
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* Touchscreen LRADC channels receives a private slot in the CTRL4
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@ -929,9 +936,84 @@ static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
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return -EINVAL;
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}
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static ssize_t mxs_lradc_show_scale_available_ch(struct device *dev,
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struct device_attribute *attr,
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char *buf,
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int ch)
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{
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struct iio_dev *iio = dev_to_iio_dev(dev);
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struct mxs_lradc *lradc = iio_priv(iio);
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int i, len = 0;
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for (i = 0; i < ARRAY_SIZE(lradc->scale_avail[ch]); i++)
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len += sprintf(buf + len, "%d.%09u ",
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lradc->scale_avail[ch][i].integer,
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lradc->scale_avail[ch][i].nano);
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len += sprintf(buf + len, "\n");
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return len;
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}
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static ssize_t mxs_lradc_show_scale_available(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev_attr *iio_attr = to_iio_dev_attr(attr);
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return mxs_lradc_show_scale_available_ch(dev, attr, buf,
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iio_attr->address);
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}
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#define SHOW_SCALE_AVAILABLE_ATTR(ch) \
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static IIO_DEVICE_ATTR(in_voltage##ch##_scale_available, S_IRUGO, \
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mxs_lradc_show_scale_available, NULL, ch)
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SHOW_SCALE_AVAILABLE_ATTR(0);
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SHOW_SCALE_AVAILABLE_ATTR(1);
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SHOW_SCALE_AVAILABLE_ATTR(2);
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SHOW_SCALE_AVAILABLE_ATTR(3);
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SHOW_SCALE_AVAILABLE_ATTR(4);
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SHOW_SCALE_AVAILABLE_ATTR(5);
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SHOW_SCALE_AVAILABLE_ATTR(6);
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SHOW_SCALE_AVAILABLE_ATTR(7);
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SHOW_SCALE_AVAILABLE_ATTR(8);
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SHOW_SCALE_AVAILABLE_ATTR(9);
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SHOW_SCALE_AVAILABLE_ATTR(10);
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SHOW_SCALE_AVAILABLE_ATTR(11);
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SHOW_SCALE_AVAILABLE_ATTR(12);
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SHOW_SCALE_AVAILABLE_ATTR(13);
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SHOW_SCALE_AVAILABLE_ATTR(14);
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SHOW_SCALE_AVAILABLE_ATTR(15);
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static struct attribute *mxs_lradc_attributes[] = {
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&iio_dev_attr_in_voltage0_scale_available.dev_attr.attr,
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&iio_dev_attr_in_voltage1_scale_available.dev_attr.attr,
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&iio_dev_attr_in_voltage2_scale_available.dev_attr.attr,
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&iio_dev_attr_in_voltage3_scale_available.dev_attr.attr,
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&iio_dev_attr_in_voltage4_scale_available.dev_attr.attr,
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&iio_dev_attr_in_voltage5_scale_available.dev_attr.attr,
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&iio_dev_attr_in_voltage6_scale_available.dev_attr.attr,
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&iio_dev_attr_in_voltage7_scale_available.dev_attr.attr,
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&iio_dev_attr_in_voltage8_scale_available.dev_attr.attr,
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&iio_dev_attr_in_voltage9_scale_available.dev_attr.attr,
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&iio_dev_attr_in_voltage10_scale_available.dev_attr.attr,
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&iio_dev_attr_in_voltage11_scale_available.dev_attr.attr,
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&iio_dev_attr_in_voltage12_scale_available.dev_attr.attr,
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&iio_dev_attr_in_voltage13_scale_available.dev_attr.attr,
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&iio_dev_attr_in_voltage14_scale_available.dev_attr.attr,
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&iio_dev_attr_in_voltage15_scale_available.dev_attr.attr,
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NULL
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};
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static const struct attribute_group mxs_lradc_attribute_group = {
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.attrs = mxs_lradc_attributes,
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};
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static const struct iio_info mxs_lradc_iio_info = {
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.driver_module = THIS_MODULE,
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.read_raw = mxs_lradc_read_raw,
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.attrs = &mxs_lradc_attribute_group,
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};
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static int mxs_lradc_ts_open(struct input_dev *dev)
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@ -1241,6 +1323,7 @@ static const struct iio_buffer_setup_ops mxs_lradc_buffer_ops = {
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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BIT(IIO_CHAN_INFO_SCALE), \
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.channel = (idx), \
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.address = (idx), \
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.scan_type = { \
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.sign = 'u', \
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.realbits = LRADC_RESOLUTION, \
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@ -1386,7 +1469,8 @@ static int mxs_lradc_probe(struct platform_device *pdev)
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struct iio_dev *iio;
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struct resource *iores;
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int ret = 0, touch_ret;
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int i;
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int i, s;
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unsigned int scale_uv;
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/* Allocate the IIO device. */
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iio = devm_iio_device_alloc(dev, sizeof(*lradc));
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@ -1456,6 +1540,26 @@ static int mxs_lradc_probe(struct platform_device *pdev)
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if (ret)
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goto err_trig;
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/* Populate available ADC input ranges */
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for (i = 0; i < LRADC_MAX_TOTAL_CHANS; i++) {
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for (s = 0; s < ARRAY_SIZE(lradc->scale_avail[i]); s++) {
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/*
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* [s=0] = optional divider by two disabled (default)
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* [s=1] = optional divider by two enabled
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*
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* The scale is calculated by doing:
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* Vref >> (realbits - s)
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* which multiplies by two on the second component
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* of the array.
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*/
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scale_uv = ((u64)lradc->vref_mv[i] * 100000000) >>
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(iio->channels[i].scan_type.realbits - s);
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lradc->scale_avail[i][s].nano =
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do_div(scale_uv, 100000000) * 10;
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lradc->scale_avail[i][s].integer = scale_uv;
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}
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}
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/* Configure the hardware. */
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ret = mxs_lradc_hw_init(lradc);
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if (ret)
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