input: ti_am335x_adc: use only FIFO0 and clean up a little

The driver programs a threshold of "coordinate_readouts" say 5. The
REG_FIFO0THR registers says it should it be programmed to "threshold
minus one". The driver does not expect just 5 coordinates but 5 * 2 + 2.
Multiplied by two because 5 for X and 5 for Y and plus 2 because we have
two Z.
The whole thing kind of works because It reads the 5 coordinates for X
and Y from FIFO0 and FIFO1 and the last element in each FIFO is ignored
within the loop and read later.
Nothing guaranties that FIFO1 is ready by the time it is read. In fact I
could see that that FIFO1 reaturns for Y channels 8,9, 10, 12, 6 and for
Y channel 7 for Z. The problem is that channel 7 and channel 12 got
somehow mixed up.
The other Problem is that FIFO1 is also used by the IIO part leading to
wrong results if both (tsc & adc) are used.

The patch tries to clean up the whole thing a little:
- Remove the +1 and -1 in REG_STEPCONFIG, REG_STEPDELAY and its counter
  part in the for loop. This is just confusing.

- Use only FIFO0 in TSC. The fifo has space for 64 entries so should be
  fine.

- Read the whole FIFO in one function and check the channel.

- in case we dawdle around, make sure we only read a multiple of our
  coordinate set. On the second interrupt we will cleanup the remaining
  enties.

Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

1 files changed, 41 insertions, 37 deletions

diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index ff3215ddf9f5..1bceb2591fc7 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -120,11 +120,9 @@ static int titsc_config_wires(struct titsc *ts_dev)
 static void titsc_step_config(struct titsc *ts_dev)
 {
         unsigned int    config;
-        unsigned int    stepenable = 0;
-        int i, total_steps;
-
-        /* Configure the Step registers */
-        total_steps = 2 * ts_dev->coordinate_readouts;
+        int i;
+        int end_step;
+        u32 stepenable;
 
         config = STEPCONFIG_MODE_HWSYNC |
                         STEPCONFIG_AVG_16 | ts_dev->bit_xp;
@@ -142,7 +140,9 @@ static void titsc_step_config(struct titsc *ts_dev)
                 break;
         }
 
-        for (i = 1; i <= ts_dev->coordinate_readouts; i++) {
+        /* 1 … coordinate_readouts is for X */
+        end_step = ts_dev->coordinate_readouts;
+        for (i = 0; i < end_step; i++) {
                 titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
                 titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
         }
@@ -150,7 +150,7 @@ static void titsc_step_config(struct titsc *ts_dev)
         config = 0;
         config = STEPCONFIG_MODE_HWSYNC |
                         STEPCONFIG_AVG_16 | ts_dev->bit_yn |
-                        STEPCONFIG_INM_ADCREFM | STEPCONFIG_FIFO1;
+                        STEPCONFIG_INM_ADCREFM;
         switch (ts_dev->wires) {
         case 4:
                 config |= ts_dev->bit_yp | STEPCONFIG_INP(ts_dev->inp_xp);
@@ -164,12 +164,13 @@ static void titsc_step_config(struct titsc *ts_dev)
                 break;
         }
 
-        for (i = (ts_dev->coordinate_readouts + 1); i <= total_steps; i++) {
+        /* coordinate_readouts … coordinate_readouts * 2 is for Y */
+        end_step = ts_dev->coordinate_readouts * 2;
+        for (i = ts_dev->coordinate_readouts; i < end_step; i++) {
                 titsc_writel(ts_dev, REG_STEPCONFIG(i), config);
                 titsc_writel(ts_dev, REG_STEPDELAY(i), STEPCONFIG_OPENDLY);
         }
 
-        config = 0;
         /* Charge step configuration */
         config = ts_dev->bit_xp | ts_dev->bit_yn |
                         STEPCHARGE_RFP_XPUL | STEPCHARGE_RFM_XNUR |
@@ -178,35 +179,39 @@ static void titsc_step_config(struct titsc *ts_dev)
         titsc_writel(ts_dev, REG_CHARGECONFIG, config);
         titsc_writel(ts_dev, REG_CHARGEDELAY, CHARGEDLY_OPENDLY);
 
-        config = 0;
-        /* Configure to calculate pressure */
+        /* coordinate_readouts * 2 … coordinate_readouts * 2 + 2 is for Z */
         config = STEPCONFIG_MODE_HWSYNC |
                         STEPCONFIG_AVG_16 | ts_dev->bit_yp |
                         ts_dev->bit_xn | STEPCONFIG_INM_ADCREFM |
                         STEPCONFIG_INP(ts_dev->inp_xp);
-        titsc_writel(ts_dev, REG_STEPCONFIG(total_steps + 1), config);
-        titsc_writel(ts_dev, REG_STEPDELAY(total_steps + 1),
+        titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config);
+        titsc_writel(ts_dev, REG_STEPDELAY(end_step),
                         STEPCONFIG_OPENDLY);
 
-        config |= STEPCONFIG_INP(ts_dev->inp_yn) | STEPCONFIG_FIFO1;
-        titsc_writel(ts_dev, REG_STEPCONFIG(total_steps + 2), config);
-        titsc_writel(ts_dev, REG_STEPDELAY(total_steps + 2),
+        end_step++;
+        config |= STEPCONFIG_INP(ts_dev->inp_yn);
+        titsc_writel(ts_dev, REG_STEPCONFIG(end_step), config);
+        titsc_writel(ts_dev, REG_STEPDELAY(end_step),
                         STEPCONFIG_OPENDLY);
 
         /* The steps1 … end and bit 0 for TS_Charge */
-        stepenable = (1 << (total_steps + 2)) - 1;
+        stepenable = (1 << (end_step + 2)) - 1;
         am335x_tsc_se_set(ts_dev->mfd_tscadc, stepenable);
 }
 
 static void titsc_read_coordinates(struct titsc *ts_dev,
-                                    unsigned int *x, unsigned int *y)
+                u32 *x, u32 *y, u32 *z1, u32 *z2)
 {
         unsigned int fifocount = titsc_readl(ts_dev, REG_FIFO0CNT);
         unsigned int prev_val_x = ~0, prev_val_y = ~0;
         unsigned int prev_diff_x = ~0, prev_diff_y = ~0;
         unsigned int read, diff;
         unsigned int i, channel;
+        unsigned int creads = ts_dev->coordinate_readouts;
 
+        *z1 = *z2 = 0;
+        if (fifocount % (creads * 2 + 2))
+                fifocount -= fifocount % (creads * 2 + 2);
         /*
          * Delta filter is used to remove large variations in sampled
          * values from ADC. The filter tries to predict where the next
@@ -215,32 +220,32 @@ static void titsc_read_coordinates(struct titsc *ts_dev,
          * algorithm compares the difference with that of a present value,
          * if true the value is reported to the sub system.
          */
-        for (i = 0; i < fifocount - 1; i++) {
+        for (i = 0; i < fifocount; i++) {
                 read = titsc_readl(ts_dev, REG_FIFO0);
-                channel = read & 0xf0000;
-                channel = channel >> 0x10;
-                if ((channel >= 0) && (channel < ts_dev->coordinate_readouts)) {
-                        read &= 0xfff;
+
+                channel = (read & 0xf0000) >> 16;
+                read &= 0xfff;
+                if (channel < creads) {
                         diff = abs(read - prev_val_x);
                         if (diff < prev_diff_x) {
                                 prev_diff_x = diff;
                                 *x = read;
                         }
                         prev_val_x = read;
-                }
 
-                read = titsc_readl(ts_dev, REG_FIFO1);
-                channel = read & 0xf0000;
-                channel = channel >> 0x10;
-                if ((channel >= ts_dev->coordinate_readouts) &&
-                        (channel < (2 * ts_dev->coordinate_readouts - 1))) {
-                        read &= 0xfff;
+                } else if (channel < creads * 2) {
                         diff = abs(read - prev_val_y);
                         if (diff < prev_diff_y) {
                                 prev_diff_y = diff;
                                 *y = read;
                         }
                         prev_val_y = read;
+
+                } else if (channel < creads * 2 + 1) {
+                        *z1 = read;
+
+                } else if (channel < creads * 2 + 2) {
+                        *z2 = read;
                 }
         }
 }
@@ -256,10 +261,8 @@ static irqreturn_t titsc_irq(int irq, void *dev)
 
         status = titsc_readl(ts_dev, REG_IRQSTATUS);
         if (status & IRQENB_FIFO0THRES) {
-                titsc_read_coordinates(ts_dev, &x, &y);
 
-                z1 = titsc_readl(ts_dev, REG_FIFO0) & 0xfff;
-                z2 = titsc_readl(ts_dev, REG_FIFO1) & 0xfff;
+                titsc_read_coordinates(ts_dev, &x, &y, &z1, &z2);
 
                 if (ts_dev->pen_down && z1 != 0 && z2 != 0) {
                         /*
@@ -267,10 +270,10 @@ static irqreturn_t titsc_irq(int irq, void *dev)
                          * Resistance(touch) = x plate resistance *
                          * x postion/4096 * ((z2 / z1) - 1)
                          */
-                        z = z2 - z1;
+                        z = z1 - z2;
                         z *= x;
                         z *= ts_dev->x_plate_resistance;
-                        z /= z1;
+                        z /= z2;
                         z = (z + 2047) >> 12;
 
                         if (z <= MAX_12BIT) {
@@ -391,7 +394,8 @@ static int titsc_probe(struct platform_device *pdev)
                 goto err_free_irq;
         }
         titsc_step_config(ts_dev);
-        titsc_writel(ts_dev, REG_FIFO0THR, ts_dev->coordinate_readouts);
+        titsc_writel(ts_dev, REG_FIFO0THR,
+                        ts_dev->coordinate_readouts * 2 + 2 - 1);
 
         input_dev->name = "ti-tsc";
         input_dev->dev.parent = &pdev->dev;
@@ -468,7 +472,7 @@ static int titsc_resume(struct device *dev)
         }
         titsc_step_config(ts_dev);
         titsc_writel(ts_dev, REG_FIFO0THR,
-                        ts_dev->coordinate_readouts);
+                        ts_dev->coordinate_readouts * 2 + 2 - 1);
         return 0;
 }