iio: mxs-lradc: make ADC reads not disable touchscreen interrupts

commit 86bf7f3ef7e961e91e16dceb31ae0f583483b204 upstream.

Reading a channel through sysfs, or starting a buffered capture, will
currently turn off the touchscreen. This is because the read_raw() and
buffer preenable()/postdisable() callbacks disable interrupts for all
LRADC channels, including those the touchscreen uses.

So make the callbacks only disable interrupts for the channels they use.
This means channel 0 for read_raw() and channels 0-5 for the buffer (if
the touchscreen is enabled). Since the touchscreen uses different
channels (6 and 7), it no longer gets turned off.

Note that only i.MX28 is affected by this issue, i.MX23 should be fine.

Signed-off-by: Kristina Martšenko <kristina.martsenko@gmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
index 68391c07c913a4760c9504979d1e7134cbe36f65..80512e2d18cd516b3c0c22240662e1a8501a35b5 100644 (file)
--- a/drivers/staging/iio/adc/mxs-lradc.c
+++ b/drivers/staging/iio/adc/mxs-lradc.c
@@ -220,6 +220,9 @@ struct mxs_lradc {
         */
 #define TOUCHSCREEN_VCHANNEL1          7
 #define TOUCHSCREEN_VCHANNEL2          6
+#define BUFFER_VCHANS_LIMITED          0x3f
+#define BUFFER_VCHANS_ALL              0xff
+       u8                      buffer_vchans;
 
        /*
         * Furthermore, certain LRADC channels are shared between touchscreen
@@ -824,7 +827,7 @@ static int mxs_lradc_read_single(struct iio_dev *iio_dev, int chan, int *val)
         * used if doing raw sampling.
         */
        if (lradc->soc == IMX28_LRADC)
-               mxs_lradc_reg_clear(lradc, LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK,
+               mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0),
                        LRADC_CTRL1);
        mxs_lradc_reg_clear(lradc, 0xff, LRADC_CTRL0);
 
@@ -1272,8 +1275,9 @@ static int mxs_lradc_buffer_preenable(struct iio_dev *iio)
        }
 
        if (lradc->soc == IMX28_LRADC)
-               mxs_lradc_reg_clear(lradc, LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK,
-                                                       LRADC_CTRL1);
+               mxs_lradc_reg_clear(lradc,
+                       lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
+                       LRADC_CTRL1);
        mxs_lradc_reg_clear(lradc, 0xff, LRADC_CTRL0);
 
        for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
@@ -1309,8 +1313,9 @@ static int mxs_lradc_buffer_postdisable(struct iio_dev *iio)
 
        mxs_lradc_reg_clear(lradc, 0xff, LRADC_CTRL0);
        if (lradc->soc == IMX28_LRADC)
-               mxs_lradc_reg_clear(lradc, LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK,
-                                       LRADC_CTRL1);
+               mxs_lradc_reg_clear(lradc,
+                       lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
+                       LRADC_CTRL1);
 
        kfree(lradc->buffer);
        mutex_unlock(&lradc->lock);
@@ -1554,6 +1559,11 @@ static int mxs_lradc_probe(struct platform_device *pdev)
 
        touch_ret = mxs_lradc_probe_touchscreen(lradc, node);
 
+       if (touch_ret == 0)
+               lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
+       else
+               lradc->buffer_vchans = BUFFER_VCHANS_ALL;
+
        /* Grab all IRQ sources */
        for (i = 0; i < of_cfg->irq_count; i++) {
                lradc->irq[i] = platform_get_irq(pdev, i);