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Date: Sat, 7 Dec 2013 01:23:58 +0100
From: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: lars@...afoo.de, Marek Vasut <marex@...x.de>, harald@...ib.org,
hector.palacios@...i.com, linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org,
Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: [PATCHv4 1/3] iio: mxs-lradc: add scale attribute to channels
From: Hector Palacios <hector.palacios@...i.com>
Some LRADC channels have fixed pre-dividers and all have an optional
divider by two which allows a maximum input voltage of VDDIO - 50mV.
This patch
- adds the scaling info flag to all channels
- grabs the max reference voltage per channel
(where the fixed pre-dividers apply)
- allows to read the scaling attribute (computed from the Vref)
Signed-off-by: Hector Palacios <hector.palacios@...i.com>.
Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---
drivers/staging/iio/adc/mxs-lradc.c | 56 +++++++++++++++++++++++++++++++++++--
1 file changed, 54 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
index 5a4499c3d22a..22fef0a408db 100644
--- a/drivers/staging/iio/adc/mxs-lradc.c
+++ b/drivers/staging/iio/adc/mxs-lradc.c
@@ -111,16 +111,59 @@ static const char * const mx28_lradc_irq_names[] = {
struct mxs_lradc_of_config {
const int irq_count;
const char * const *irq_name;
+ const uint32_t *vref_mv;
+};
+
+#define VREF_MV_BASE 1850
+
+static const uint32_t mx23_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
+ VREF_MV_BASE, /* CH0 */
+ VREF_MV_BASE, /* CH1 */
+ VREF_MV_BASE, /* CH2 */
+ VREF_MV_BASE, /* CH3 */
+ VREF_MV_BASE, /* CH4 */
+ VREF_MV_BASE, /* CH5 */
+ VREF_MV_BASE * 2, /* CH6 VDDIO */
+ VREF_MV_BASE * 4, /* CH7 VBATT */
+ VREF_MV_BASE, /* CH8 Temp sense 0 */
+ VREF_MV_BASE, /* CH9 Temp sense 1 */
+ VREF_MV_BASE, /* CH10 */
+ VREF_MV_BASE, /* CH11 */
+ VREF_MV_BASE, /* CH12 USB_DP */
+ VREF_MV_BASE, /* CH13 USB_DN */
+ VREF_MV_BASE, /* CH14 VBG */
+ VREF_MV_BASE * 4, /* CH15 VDD5V */
+};
+
+static const uint32_t mx28_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
+ VREF_MV_BASE, /* CH0 */
+ VREF_MV_BASE, /* CH1 */
+ VREF_MV_BASE, /* CH2 */
+ VREF_MV_BASE, /* CH3 */
+ VREF_MV_BASE, /* CH4 */
+ VREF_MV_BASE, /* CH5 */
+ VREF_MV_BASE, /* CH6 */
+ VREF_MV_BASE * 4, /* CH7 VBATT */
+ VREF_MV_BASE, /* CH8 Temp sense 0 */
+ VREF_MV_BASE, /* CH9 Temp sense 1 */
+ VREF_MV_BASE * 2, /* CH10 VDDIO */
+ VREF_MV_BASE, /* CH11 VTH */
+ VREF_MV_BASE * 2, /* CH12 VDDA */
+ VREF_MV_BASE, /* CH13 VDDD */
+ VREF_MV_BASE, /* CH14 VBG */
+ VREF_MV_BASE * 4, /* CH15 VDD5V */
};
static const struct mxs_lradc_of_config mxs_lradc_of_config[] = {
[IMX23_LRADC] = {
.irq_count = ARRAY_SIZE(mx23_lradc_irq_names),
.irq_name = mx23_lradc_irq_names,
+ .vref_mv = mx23_vref_mv,
},
[IMX28_LRADC] = {
.irq_count = ARRAY_SIZE(mx28_lradc_irq_names),
.irq_name = mx28_lradc_irq_names,
+ .vref_mv = mx28_vref_mv,
},
};
@@ -155,6 +198,8 @@ struct mxs_lradc {
struct completion completion;
+ const uint32_t *vref_mv;
+
/*
* Touchscreen LRADC channels receives a private slot in the CTRL4
* register, the slot #7. Therefore only 7 slots instead of 8 in the
@@ -836,6 +881,8 @@ static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
const struct iio_chan_spec *chan,
int *val, int *val2, long m)
{
+ struct mxs_lradc *lradc = iio_priv(iio_dev);
+
/* Check for invalid channel */
if (chan->channel > LRADC_MAX_TOTAL_CHANS)
return -EINVAL;
@@ -857,7 +904,9 @@ static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
return IIO_VAL_INT_PLUS_MICRO;
}
- return -EINVAL;
+ *val = lradc->vref_mv[chan->channel];
+ *val2 = chan->scan_type.realbits;
+ return IIO_VAL_FRACTIONAL_LOG2;
case IIO_CHAN_INFO_OFFSET:
if (chan->type == IIO_TEMP) {
@@ -1189,7 +1238,8 @@ static const struct iio_buffer_setup_ops mxs_lradc_buffer_ops = {
.type = (chan_type), \
.indexed = 1, \
.scan_index = (idx), \
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_SCALE), \
.channel = (idx), \
.scan_type = { \
.sign = 'u', \
@@ -1381,6 +1431,8 @@ static int mxs_lradc_probe(struct platform_device *pdev)
return ret;
}
+ lradc->vref_mv = of_cfg->vref_mv;
+
platform_set_drvdata(pdev, iio);
init_completion(&lradc->completion);
--
1.8.3.2
--
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