Add an IIO map interface that consumers can use.
Also make sure the mfd device doesn't activate a driver which
the configuration doesn't require.
Signed-off-by: Pantelis Antoniou <pa...@antoniou-consulting.com>
---
drivers/iio/adc/ti_am335x_adc.c | 53 ++++++++++++++++++++++++++++++------
drivers/mfd/ti_am335x_tscadc.c | 30 ++++++++++++++------
include/linux/mfd/ti_am335x_tscadc.h | 8 ++----
3 files changed, 68 insertions(+), 23 deletions(-)
diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index 02a43c8..d48fd79 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;
+ struct iio_map *map;
};
static unsigned int tiadc_readl(struct tiadc_device *adc, unsigned int reg)
@@ -75,25 +78,57 @@ static void tiadc_step_config(struct tiadc_device *adc_dev)
static int tiadc_channel_init(struct iio_dev *indio_dev, int channels)
{
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;
+ size = indio_dev->num_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 + indio_dev->num_channels);
+ chan = chan_array;
+ for (i = 0; i < indio_dev->num_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;
}
indio_dev->channels = chan_array;
+ size = (indio_dev->num_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;
+
+ 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;
}
diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
index e947dd8..cbb8b70c 100644
--- a/drivers/mfd/ti_am335x_tscadc.c
+++ b/drivers/mfd/ti_am335x_tscadc.c
@@ -176,26 +176,38 @@ static int __devinit ti_tscadc_probe(struct
platform_device *pdev)
ctrl |= CNTRLREG_TSCSSENB;
tscadc_writel(tscadc, REG_CTRL, ctrl);
+ tscadc->used_cells = 0;
+ tscadc->tsc_cell = -1;
+ tscadc->adc_cell = -1;
+
/* TSC Cell */
- cell = &tscadc->cells[TSC_CELL];
- cell->name = "tsc";
- cell->platform_data = tscadc;
- cell->pdata_size = sizeof(*tscadc);
+ if (tsc_wires > 0) {
+ tscadc->tsc_cell = tscadc->used_cells;
+ cell = &tscadc->cells[tscadc->used_cells++];
+ cell->name = "tsc";
+ cell->platform_data = tscadc;
+ cell->pdata_size = sizeof(*tscadc);
+ }
/* ADC Cell */
- cell = &tscadc->cells[ADC_CELL];
- cell->name = "tiadc";
- cell->platform_data = tscadc;
- cell->pdata_size = sizeof(*tscadc);
+ if (adc_channels > 0) {
+ tscadc->adc_cell = tscadc->used_cells;
+ cell = &tscadc->cells[tscadc->used_cells++];
+ cell->name = "tiadc";
+ cell->platform_data = tscadc;
+ cell->pdata_size = sizeof(*tscadc);
+ }
err = mfd_add_devices(&pdev->dev, pdev->id, tscadc->cells,
- TSCADC_CELLS, NULL, 0, NULL);
+ tscadc->used_cells, NULL, 0, NULL);
if (err < 0)
goto err_disable_clk;
device_init_wakeup(&pdev->dev, true);
platform_set_drvdata(pdev, tscadc);
+ dev_info(&pdev->dev, "Initialized OK.\n");
+
return 0;
err_disable_clk:
diff --git a/include/linux/mfd/ti_am335x_tscadc.h
b/include/linux/mfd/ti_am335x_tscadc.h
index 9624fea..50a245f 100644
--- a/include/linux/mfd/ti_am335x_tscadc.h
+++ b/include/linux/mfd/ti_am335x_tscadc.h
@@ -128,11 +128,6 @@
#define TSCADC_CELLS 2
-enum tscadc_cells {
- TSC_CELL,
- ADC_CELL,
-};
-
struct mfd_tscadc_board {
struct tsc_data *tsc_init;
struct adc_data *adc_init;
@@ -143,6 +138,9 @@ struct ti_tscadc_dev {
struct regmap *regmap_tscadc;
void __iomem *tscadc_base;
int irq;
+ int used_cells; /* 0-2 */
+ int tsc_cell; /* -1 if not used */
+ int adc_cell; /* -1 if not used */
struct mfd_cell cells[TSCADC_CELLS];
/* tsc device */
--
1.7.12
--
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