On 07/18/2013 11:21 PM, Zubair Lutfullah wrote:
> From: "Patil, Rachna" <rachna@xxxxxx>
>
> Current ADC driver supports only one shot mode.
> Now ADC driver is enhanced to capture data continuously
> from /dev/iio:deviceX interface.
>
> ADC is now IRQ based, on interrupt ADC copies data onto
> a software buffer, which is exposed to user.
>
> Signed-off-by: Patil, Rachna <rachna@xxxxxx>
> Signed-off-by: Zubair Lutfullah <zubair.lutfullah@xxxxxxxxx>
Couple of bits inline.
One reasonably big point though:
What is the mode attribute for? The buffer enabled should handle
that fine within the standard abi.
> ---
> drivers/iio/adc/ti_am335x_adc.c | 350 +++++++++++++++++++++++++----
> drivers/input/touchscreen/ti_am335x_tsc.c | 9 +-
> drivers/mfd/ti_am335x_tscadc.c | 12 +-
> include/linux/mfd/ti_am335x_tscadc.h | 10 +
> 4 files changed, 322 insertions(+), 59 deletions(-)
>
> diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
> index f73fee1..c1b051c 100644
> --- a/drivers/iio/adc/ti_am335x_adc.c
> +++ b/drivers/iio/adc/ti_am335x_adc.c
> @@ -26,14 +26,24 @@
> #include <linux/of_device.h>
> #include <linux/iio/machine.h>
> #include <linux/iio/driver.h>
> -
> #include <linux/mfd/ti_am335x_tscadc.h>
> +#include <linux/stat.h>
> +#include <linux/sched.h>
> +#include <linux/iio/buffer.h>
> +#include <linux/iio/trigger_consumer.h>
> +#include <linux/iio/kfifo_buf.h>
> +#include <linux/iio/sysfs.h>
>
> struct tiadc_device {
> struct ti_tscadc_dev *mfd_tscadc;
> int channels;
> u8 channel_line[8];
> u8 channel_step[8];
> + struct work_struct poll_work;
> + wait_queue_head_t wq_data_avail;
> + int irq;
> + bool is_continuous_mode;
> + u16 *buffer;
> };
>
> static unsigned int tiadc_readl(struct tiadc_device *adc, unsigned int reg)
> @@ -56,7 +66,7 @@ static u32 get_adc_step_mask(struct tiadc_device *adc_dev)
> return step_en;
> }
>
> -static void tiadc_step_config(struct tiadc_device *adc_dev)
> +static void tiadc_step_config(struct tiadc_device *adc_dev, bool mode)
> {
> unsigned int stepconfig;
> int i, steps;
> @@ -72,7 +82,11 @@ static void tiadc_step_config(struct tiadc_device *adc_dev)
> */
>
> steps = TOTAL_STEPS - adc_dev->channels;
> - stepconfig = STEPCONFIG_AVG_16 | STEPCONFIG_FIFO1;
> + if (mode == false)
> + stepconfig = STEPCONFIG_AVG_16 | STEPCONFIG_FIFO1;
> + else
> + stepconfig = STEPCONFIG_AVG_16 | STEPCONFIG_FIFO1
> + | STEPCONFIG_MODE_SWCNT;
>
> for (i = 0; i < adc_dev->channels; i++) {
> int chan;
> @@ -88,6 +102,213 @@ static void tiadc_step_config(struct tiadc_device *adc_dev)
>
> }
>
> +static ssize_t tiadc_show_mode(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct tiadc_device *adc_dev = iio_priv(indio_dev);
> + unsigned int tmp;
> +
> + tmp = tiadc_readl(adc_dev, REG_STEPCONFIG(TOTAL_STEPS));
> + tmp &= STEPCONFIG_MODE(1);
> +
> + if (tmp == 0x00)
> + return sprintf(buf, "oneshot\n");
> + else if (tmp == 0x01)
> + return sprintf(buf, "continuous\n");
> + else
> + return sprintf(buf, "Operation mode unknown\n");
> +}
> +
> +static ssize_t tiadc_set_mode(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t count)
> +{
> + struct iio_dev *indio_dev = dev_get_drvdata(dev);
> + struct tiadc_device *adc_dev = iio_priv(indio_dev);
> + unsigned config;
> +
> + config = tiadc_readl(adc_dev, REG_CTRL);
> + config &= ~(CNTRLREG_TSCSSENB);
> + tiadc_writel(adc_dev, REG_CTRL, config);
> +
> + if (!strncmp(buf, "oneshot", 7))
> + adc_dev->is_continuous_mode = false;
> + else if (!strncmp(buf, "continuous", 10))
> + adc_dev->is_continuous_mode = true;
> + else {
> + dev_err(dev, "Operational mode unknown\n");
> + return -EINVAL;
> + }
> +
> + tiadc_step_config(adc_dev, adc_dev->is_continuous_mode);
> +
> + config = tiadc_readl(adc_dev, REG_CTRL);
> + tiadc_writel(adc_dev, REG_CTRL,
> + (config | CNTRLREG_TSCSSENB));
> + return count;
> +}
> +
This should be controlled by whether the buffer is enabled or not.
If it is not, then we are in oneshot mode, if it is then we are
in continuous mode. No additional control is needed.
> +static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, tiadc_show_mode,
> + tiadc_set_mode, 0);
> +
> +static struct attribute *tiadc_attributes[] = {
> + &iio_dev_attr_mode.dev_attr.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group tiadc_attribute_group = {
> + .attrs = tiadc_attributes,
> +};
> +
> +static irqreturn_t tiadc_irq(int irq, void *private)
> +{
> + struct iio_dev *idev = private;
> + struct tiadc_device *adc_dev = iio_priv(idev);
> + unsigned int status, config;
> +
> + status = tiadc_readl(adc_dev, REG_IRQSTATUS);
Some brief comments in here might be of use to people
like me reading this without enough coffee..
What are the various interrupts and what are you doing in
response to them?
> + if (status & IRQENB_FIFO1THRES) {
> + tiadc_writel(adc_dev, REG_IRQCLR,
> + IRQENB_FIFO1THRES);
> +
> + if (iio_buffer_enabled(idev)) {
> + if (!work_pending(&adc_dev->poll_work))
> + schedule_work(&adc_dev->poll_work);
> + } else {
> + wake_up_interruptible(&adc_dev->wq_data_avail);
> + }
> + tiadc_writel(adc_dev, REG_IRQSTATUS,
> + (status | IRQENB_FIFO1THRES));
> + return IRQ_HANDLED;
> + } else if ((status & IRQENB_FIFO1OVRRUN) ||
> + (status & IRQENB_FIFO1UNDRFLW)) {
> + config = tiadc_readl(adc_dev, REG_CTRL);
> + config &= ~(CNTRLREG_TSCSSENB);
> + tiadc_writel(adc_dev, REG_CTRL, config);
> +
> + if (status & IRQENB_FIFO1UNDRFLW)
> + tiadc_writel(adc_dev, REG_IRQSTATUS,
> + (status | IRQENB_FIFO1UNDRFLW));
> + else
> + tiadc_writel(adc_dev, REG_IRQSTATUS,
> + (status | IRQENB_FIFO1OVRRUN));
> +
> + tiadc_writel(adc_dev, REG_CTRL,
> + (config | CNTRLREG_TSCSSENB));
> + return IRQ_HANDLED;
> + } else {
> + return IRQ_NONE;
> + }
> +}
> +
> +static void tiadc_poll_handler(struct work_struct *work_s)
> +{
> + struct tiadc_device *adc_dev =
> + container_of(work_s, struct tiadc_device, poll_work);
> + struct iio_dev *idev = iio_priv_to_dev(adc_dev);
> + struct iio_buffer *buffer = idev->buffer;
> + unsigned int fifo1count, readx1, status;
> + int i;
> + u32 *inputbuffer;
> +
> + fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
> + inputbuffer = kmalloc((fifo1count + 1) * sizeof(u32), GFP_KERNEL);
Worth keeping a buffer of sufficient size around to avoid the allocation
here?
> + if (inputbuffer == NULL)
> + return;
> +
> + for (i = 0; i < fifo1count; i++) {
> + readx1 = tiadc_readl(adc_dev, REG_FIFO1);
> + readx1 &= FIFOREAD_DATA_MASK;
> + inputbuffer[i] = readx1;
> + }
> +
I'm slightly confused... Can the fifo contain more than one
'scan' of readings? If so you are only pushing the first into the buffer
here.
> + buffer->access->store_to(buffer, (u8 *) inputbuffer);
> + status = tiadc_readl(adc_dev, REG_IRQENABLE);
> + tiadc_writel(adc_dev, REG_IRQENABLE,
> + (status | IRQENB_FIFO1THRES));
> +
> + kfree(inputbuffer);
> +}
> +
> +static int tiadc_buffer_preenable(struct iio_dev *idev)
> +{
> + struct iio_buffer *buffer = idev->buffer;
> +
> + buffer->access->set_bytes_per_datum(buffer, 16);
blank line here
> + return 0;
> +}
> +
> +static int tiadc_buffer_postenable(struct iio_dev *idev)
> +{
> + struct tiadc_device *adc_dev = iio_priv(idev);
> + struct iio_buffer *buffer = idev->buffer;
> + unsigned int enb, status, fifo1count;
> + int stepnum, i;
> + u8 bit;
> +
> + if (!adc_dev->is_continuous_mode) {
> + pr_info("Data cannot be read continuously in one shot mode\n");
This is probably a hint that you are doing it wrong.
The buffer enable should be the thing that switches to continuous mode.
> + return -EINVAL;
> + } else {
> + status = tiadc_readl(adc_dev, REG_IRQENABLE);
> + tiadc_writel(adc_dev, REG_IRQENABLE,
> + (status | IRQENB_FIFO1THRES)|
> + IRQENB_FIFO1OVRRUN |
> + IRQENB_FIFO1UNDRFLW);
> +
> + fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
> + for (i = 0; i < fifo1count; i++)
> + tiadc_readl(adc_dev, REG_FIFO1);
> +
> + tiadc_writel(adc_dev, REG_SE, 0x00);
> + for_each_set_bit(bit, buffer->scan_mask,
> + adc_dev->channels) {
> + struct iio_chan_spec const *chan = idev->channels + bit;
> + /*
> + * There are a total of 16 steps available
> + * that are shared between ADC and touchscreen.
> + * We start configuring from step 16 to 0 incase of
> + * ADC. Hence the relation between input channel
> + * and step for ADC would be as below.
> + */
> + stepnum = chan->channel + 9;
> + enb = tiadc_readl(adc_dev, REG_SE);
> + enb |= (1 << stepnum);
> + tiadc_writel(adc_dev, REG_SE, enb);
> + }
> + return 0;
> + }
> +}
> +
For symmetry I'd expect to see this in predisable. Otherwise,
you might get such an interrupt after the buffer has been ripped
down and fun might ensue.
> +static int tiadc_buffer_postdisable(struct iio_dev *idev)
> +{
> + struct tiadc_device *adc_dev = iio_priv(idev);
> +
> + tiadc_writel(adc_dev, REG_IRQCLR, (IRQENB_FIFO1THRES |
> + IRQENB_FIFO1OVRRUN |
> + IRQENB_FIFO1UNDRFLW));
> + tiadc_writel(adc_dev, REG_SE, STPENB_STEPENB_TC);
blank line here.
> + return 0;
> +}
> +
> +static const struct iio_buffer_setup_ops tiadc_buffer_setup_ops = {
> + .preenable = &tiadc_buffer_preenable,
> + .postenable = &tiadc_buffer_postenable,
> + .postdisable = &tiadc_buffer_postdisable,
> +};
> +
> +static int tiadc_config_buffer(struct iio_dev *idev)
> +{
> + struct tiadc_device *adc_dev = iio_priv(idev);
nitpick time ;) Blank line here.
> + idev->buffer = iio_kfifo_allocate(idev);
> + if (!idev->buffer)
> + return -ENOMEM;
> + idev->setup_ops = &tiadc_buffer_setup_ops;
> + INIT_WORK(&adc_dev->poll_work, &tiadc_poll_handler);
> + idev->modes |= INDIO_BUFFER_HARDWARE;
and here.
> + return 0;
> +}
> +
> static const char * const chan_name_ain[] = {
> "AIN0",
> "AIN1",
> @@ -120,6 +341,7 @@ static int tiadc_channel_init(struct iio_dev *indio_dev, int channels)
> chan->channel = adc_dev->channel_line[i];
> chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
> chan->datasheet_name = chan_name_ain[chan->channel];
> + chan->scan_index = i;
> chan->scan_type.sign = 'u';
> chan->scan_type.realbits = 12;
> chan->scan_type.storagebits = 32;
> @@ -147,56 +369,62 @@ static int tiadc_read_raw(struct iio_dev *indio_dev,
> u32 step_en;
> unsigned long timeout = jiffies + usecs_to_jiffies
> (IDLE_TIMEOUT * adc_dev->channels);
> - step_en = get_adc_step_mask(adc_dev);
> - am335x_tsc_se_set(adc_dev->mfd_tscadc, step_en);
>
> - /* Wait for ADC sequencer to complete sampling */
> - while (tiadc_readl(adc_dev, REG_ADCFSM) & SEQ_STATUS) {
> - if (time_after(jiffies, timeout))
> - return -EAGAIN;
> - }
> - map_val = chan->channel + TOTAL_CHANNELS;
> -
> - /*
> - * When the sub-system is first enabled,
> - * the sequencer will always start with the
> - * lowest step (1) and continue until step (16).
> - * For ex: If we have enabled 4 ADC channels and
> - * currently use only 1 out of them, the
> - * sequencer still configures all the 4 steps,
> - * leading to 3 unwanted data.
> - * 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))
> + if (adc_dev->is_continuous_mode) {
> + pr_info("One shot mode not enabled\n");
> return -EINVAL;
-EBUSY probably makes more sense.
> -
> - fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT);
> - for (i = 0; i < fifo1count; i++) {
> - read = tiadc_readl(adc_dev, REG_FIFO1);
> - stepid = read & FIFOREAD_CHNLID_MASK;
> - stepid = stepid >> 0x10;
> -
> - if (stepid == map_val) {
> - read = read & FIFOREAD_DATA_MASK;
> - found = true;
> - *val = read;
> + } else {
> + step_en = get_adc_step_mask(adc_dev);
> + am335x_tsc_se_set(adc_dev->mfd_tscadc, step_en);
> +
> + /* Wait for ADC sequencer to complete sampling */
> + while (tiadc_readl(adc_dev, REG_ADCFSM) & SEQ_STATUS) {
> + if (time_after(jiffies, timeout))
> + return -EAGAIN;
> + }
> + map_val = chan->channel + TOTAL_CHANNELS;
> +
> + /*
> + * When the sub-system is first enabled,
> + * the sequencer will always start with the
> + * lowest step (1) and continue until step (16).
> + * For ex: If we have enabled 4 ADC channels and
> + * currently use only 1 out of them, the
> + * sequencer still configures all the 4 steps,
> + * leading to 3 unwanted data.
> + * 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++) {
> + read = tiadc_readl(adc_dev, REG_FIFO1);
> + stepid = read & FIFOREAD_CHNLID_MASK;
> + stepid = stepid >> 0x10;
> +
> + if (stepid == map_val) {
> + read = read & FIFOREAD_DATA_MASK;
> + found = true;
> + *val = read;
> + }
> + }
> + if (found == false)
> + return -EBUSY;
> + return IIO_VAL_INT;
> }
> -
> - if (found == false)
> - return -EBUSY;
> - return IIO_VAL_INT;
> }
>
> static const struct iio_info tiadc_info = {
> .read_raw = &tiadc_read_raw,
> + .attrs = &tiadc_attribute_group,
> };
>
> static int tiadc_probe(struct platform_device *pdev)
> @@ -230,18 +458,38 @@ static int tiadc_probe(struct platform_device *pdev)
> channels++;
> }
> adc_dev->channels = channels;
> + adc_dev->irq = adc_dev->mfd_tscadc->irq;
>
> indio_dev->dev.parent = &pdev->dev;
> indio_dev->name = dev_name(&pdev->dev);
> indio_dev->modes = INDIO_DIRECT_MODE;
> indio_dev->info = &tiadc_info;
>
> - tiadc_step_config(adc_dev);
> + /* by default driver comes up with oneshot mode */
> + tiadc_step_config(adc_dev, adc_dev->is_continuous_mode);
> + /* program FIFO threshold to value minus 1 */
> + tiadc_writel(adc_dev, REG_FIFO1THR, FIFO1_THRESHOLD);
>
> err = tiadc_channel_init(indio_dev, adc_dev->channels);
> if (err < 0)
> goto err_free_device;
>
> + init_waitqueue_head(&adc_dev->wq_data_avail);
> +
> + err = request_irq(adc_dev->irq, tiadc_irq, IRQF_SHARED,
> + indio_dev->name, indio_dev);
> + if (err)
> + goto err_free_irq;
> +
> + err = tiadc_config_buffer(indio_dev);
> + if (err < 0)
> + goto err_unregister;
> +
> + err = iio_buffer_register(indio_dev,
> + indio_dev->channels, indio_dev->num_channels);
> + if (err < 0)
> + goto err_unregister;
> +
> err = iio_device_register(indio_dev);
> if (err)
> goto err_free_channels;
> @@ -250,6 +498,10 @@ static int tiadc_probe(struct platform_device *pdev)
>
> return 0;
>
> +err_unregister:
> + iio_buffer_unregister(indio_dev);
> +err_free_irq:
> + free_irq(adc_dev->irq, indio_dev);
> err_free_channels:
> tiadc_channels_remove(indio_dev);
> err_free_device:
> @@ -264,7 +516,9 @@ static int tiadc_remove(struct platform_device *pdev)
> struct tiadc_device *adc_dev = iio_priv(indio_dev);
> u32 step_en;
>
> + free_irq(adc_dev->irq, indio_dev);
> iio_device_unregister(indio_dev);
> + iio_buffer_unregister(indio_dev);
> tiadc_channels_remove(indio_dev);
>
> step_en = get_adc_step_mask(adc_dev);
> @@ -300,13 +554,13 @@ static int tiadc_resume(struct device *dev)
> struct tiadc_device *adc_dev = iio_priv(indio_dev);
> unsigned int restore;
>
> + tiadc_writel(adc_dev, REG_FIFO1THR, FIFO1_THRESHOLD);
> + tiadc_step_config(adc_dev, adc_dev->is_continuous_mode);
> /* Make sure ADC is powered up */
> restore = tiadc_readl(adc_dev, REG_CTRL);
> restore &= ~(CNTRLREG_POWERDOWN);
> tiadc_writel(adc_dev, REG_CTRL, restore);
>
> - tiadc_step_config(adc_dev);
> -
> return 0;
> }
>
> diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
> index edc3d03..ba7abfe 100644
> --- a/drivers/input/touchscreen/ti_am335x_tsc.c
> +++ b/drivers/input/touchscreen/ti_am335x_tsc.c
> @@ -263,11 +263,14 @@ static irqreturn_t titsc_irq(int irq, void *dev)
>
> /*
> * ADC and touchscreen share the IRQ line.
> - * FIFO1 threshold interrupt is used by ADC,
> + * FIFO1 threshold, FIFO1 Overrun and FIFO1 underflow
> + * interrupts are used by ADC,
> * hence return from touchscreen IRQ handler if FIFO1
> - * threshold interrupt occurred.
> + * related interrupts occurred.
> */
> - if (status & IRQENB_FIFO1THRES)
> + if ((status & IRQENB_FIFO1THRES) ||
> + (status & IRQENB_FIFO1OVRRUN) ||
> + (status & IRQENB_FIFO1UNDRFLW))
> return IRQ_NONE;
Can this not be safely merged into the previous patch touching this
bit of input?
> else if (status & IRQENB_FIFO0THRES) {
> titsc_read_coordinates(ts_dev, &x, &y, &z1, &z2);
> diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
> index d72001c..9f5c326 100644
> --- a/drivers/mfd/ti_am335x_tscadc.c
> +++ b/drivers/mfd/ti_am335x_tscadc.c
> @@ -282,6 +282,8 @@ static int tscadc_suspend(struct device *dev)
> struct ti_tscadc_dev *tscadc_dev = dev_get_drvdata(dev);
>
> tscadc_writel(tscadc_dev, REG_SE, 0x00);
> + tscadc_dev->irqstat = tscadc_readl(tscadc_dev, REG_IRQENABLE);
> + tscadc_dev->ctrl = tscadc_readl(tscadc_dev, REG_CTRL);
> pm_runtime_put_sync(dev);
>
> return 0;
> @@ -290,22 +292,16 @@ static int tscadc_suspend(struct device *dev)
> static int tscadc_resume(struct device *dev)
> {
> struct ti_tscadc_dev *tscadc_dev = dev_get_drvdata(dev);
> - unsigned int restore, ctrl;
>
> pm_runtime_get_sync(dev);
>
> /* context restore */
> - ctrl = CNTRLREG_STEPCONFIGWRT | CNTRLREG_STEPID;
> - if (tscadc_dev->tsc_cell != -1)
> - ctrl |= CNTRLREG_TSCENB | CNTRLREG_4WIRE;
> - tscadc_writel(tscadc_dev, REG_CTRL, ctrl);
> + tscadc_writel(tscadc_dev, REG_IRQENABLE, tscadc_dev->irqstat);
>
> if (tscadc_dev->tsc_cell != -1)
> tscadc_idle_config(tscadc_dev);
> am335x_tsc_se_update(tscadc_dev);
> - restore = tscadc_readl(tscadc_dev, REG_CTRL);
> - tscadc_writel(tscadc_dev, REG_CTRL,
> - (restore | CNTRLREG_TSCSSENB));
> + tscadc_writel(tscadc_dev, REG_CTRL, tscadc_dev->ctrl);
>
> return 0;
> }
> diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
> index db1791b..3058aef 100644
> --- a/include/linux/mfd/ti_am335x_tscadc.h
> +++ b/include/linux/mfd/ti_am335x_tscadc.h
> @@ -46,17 +46,23 @@
> /* Step Enable */
> #define STEPENB_MASK (0x1FFFF << 0)
> #define STEPENB(val) ((val) << 0)
> +#define ENB(val) (1 << (val))
> +#define STPENB_STEPENB STEPENB(0x1FFFF)
> +#define STPENB_STEPENB_TC STEPENB(0x1FFF)
>
> /* IRQ enable */
> #define IRQENB_HW_PEN BIT(0)
> #define IRQENB_FIFO0THRES BIT(2)
> #define IRQENB_FIFO1THRES BIT(5)
> #define IRQENB_PENUP BIT(9)
> +#define IRQENB_FIFO1OVRRUN BIT(6)
> +#define IRQENB_FIFO1UNDRFLW BIT(7)
>
> /* Step Configuration */
> #define STEPCONFIG_MODE_MASK (3 << 0)
> #define STEPCONFIG_MODE(val) ((val) << 0)
> #define STEPCONFIG_MODE_HWSYNC STEPCONFIG_MODE(2)
> +#define STEPCONFIG_MODE_SWCNT STEPCONFIG_MODE(1)
> #define STEPCONFIG_AVG_MASK (7 << 2)
> #define STEPCONFIG_AVG(val) ((val) << 2)
> #define STEPCONFIG_AVG_16 STEPCONFIG_AVG(4)
> @@ -124,6 +130,7 @@
> #define MAX_CLK_DIV 7
> #define TOTAL_STEPS 16
> #define TOTAL_CHANNELS 8
> +#define FIFO1_THRESHOLD 19
>
> /*
> * ADC runs at 3MHz, and it takes
> @@ -153,6 +160,9 @@ struct ti_tscadc_dev {
>
> /* adc device */
> struct adc_device *adc;
> + /* Context save */
> + unsigned int irqstat;
> + unsigned int ctrl;
> };
>
> static inline struct ti_tscadc_dev *ti_tscadc_dev_get(struct platform_device *p)
>
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