Input: wm97xx - refactor channel selection in poll_sample()

The current implementation of poll_sample() has the problem that one of
its arguments, the channel to be selected, differs from wm9713 to other
variants. This parameter gets passed to the (currently unused)
mach-specific functions pre_sample() and post_sample() which thus have
to deal with codec-specific differences. Refactor the routine so that
the argument to poll_sample() is generic for all codecs and do necessary
conversions only in the codec-specific driver. The outcome even uses
less code and removes the non-standard use of the PEN_DOWN bit to mark
the AUX-channels.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 9 insertions, 9 deletions

diff --git a/drivers/input/touchscreen/wm9713.c b/drivers/input/touchscreen/wm9713.c
index 13cd9d1fa07a..a7558015429b 100644
--- a/drivers/input/touchscreen/wm9713.c
+++ b/drivers/input/touchscreen/wm9713.c
@@ -270,15 +270,14 @@ static int wm9713_poll_sample(struct wm97xx *wm, int adcsel, int *sample)
         }
 
         /* set up digitiser */
-        if (adcsel & 0x8000)
-                adcsel = 1 << ((adcsel & 0x7fff) + 3);
-
         dig1 = wm97xx_reg_read(wm, AC97_WM9713_DIG1);
         dig1 &= ~WM9713_ADCSEL_MASK;
+        /* WM97XX_ADCSEL_* channels need to be converted to WM9713 format */
+        dig1 |= 1 << ((adcsel & WM97XX_ADCSEL_MASK) >> 12);
 
         if (wm->mach_ops && wm->mach_ops->pre_sample)
                 wm->mach_ops->pre_sample(adcsel);
-        wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1 | adcsel | WM9713_POLL);
+        wm97xx_reg_write(wm, AC97_WM9713_DIG1, dig1 | WM9713_POLL);
 
         /* wait 3 AC97 time slots + delay for conversion */
         poll_delay(delay);
@@ -304,8 +303,9 @@ static int wm9713_poll_sample(struct wm97xx *wm, int adcsel, int *sample)
                 wm->mach_ops->post_sample(adcsel);
 
         /* check we have correct sample */
-        if ((*sample & WM97XX_ADCSEL_MASK) != ffs(adcsel >> 1) << 12) {
-                dev_dbg(wm->dev, "adc wrong sample, read %x got %x", adcsel,
+        if ((*sample ^ adcsel) & WM97XX_ADCSEL_MASK) {
+                dev_dbg(wm->dev, "adc wrong sample, wanted %x got %x",
+                        adcsel & WM97XX_ADCSEL_MASK,
                         *sample & WM97XX_ADCSEL_MASK);
                 return RC_PENUP;
         }
@@ -400,14 +400,14 @@ static int wm9713_poll_touch(struct wm97xx *wm, struct wm97xx_data *data)
                 if (rc != RC_VALID)
                         return rc;
         } else {
-                rc = wm9713_poll_sample(wm, WM9713_ADCSEL_X, &data->x);
+                rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_X, &data->x);
                 if (rc != RC_VALID)
                         return rc;
-                rc = wm9713_poll_sample(wm, WM9713_ADCSEL_Y, &data->y);
+                rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_Y, &data->y);
                 if (rc != RC_VALID)
                         return rc;
                 if (pil) {
-                        rc = wm9713_poll_sample(wm, WM9713_ADCSEL_PRES,
+                        rc = wm9713_poll_sample(wm, WM97XX_ADCSEL_PRES,
                                                 &data->p);
                         if (rc != RC_VALID)
                                 return rc;