Things that can be done to done without using make up:
- reduce config_inp from 20 elements to 4
The loop goes 0…3 so elements 4…19 remain unused.
- put the shift for analog_line into one line, since config_inp is u32 we
don't need to worry about sign extension,
- check if he DT values are 0…3 as expected
- replace "err = -EINVAL; goto err" with "return -EINVAL;" as there is no
cleanup and this is less code
- pull out "config[analog_line[i]][0…3];" from the switch case and use
magic to the 0…3 correct.
- since we removed so much lines, spent a few to get
"config[an_line][wi_order];" done.
- get rid of "val32, wires_conf" and assign the values directly. This is
just init code but we can still save a few cycles.
- remove titsc_config_wires() from resume path. ->bit_yn & friends are only
written once and not changed so as long as we assume that our DDR will
have no biflips we can skip that.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
drivers/input/touchscreen/ti_am335x_tsc.c | 124 ++++++++++++-----------------
1 file changed, 51 insertions(+), 73 deletions(-)
diff --git a/drivers/input/touchscreen/ti_am335x_tsc.c b/drivers/input/touchscreen/ti_am335x_tsc.c
index 0dbf3df..96accaa 100644
--- a/drivers/input/touchscreen/ti_am335x_tsc.c
+++ b/drivers/input/touchscreen/ti_am335x_tsc.c
@@ -59,7 +59,7 @@ struct titsc {
unsigned int bckup_y;
bool pen_down;
int steps_to_configure;
- int config_inp[20];
+ u32 config_inp[4];
int bit_xp, bit_xn, bit_yp, bit_yn;
int inp_xp, inp_xn, inp_yp, inp_yn;
};
@@ -115,69 +115,54 @@ static int regbit_map(int val)
static int titsc_config_wires(struct titsc *ts_dev)
{
- int analog_line[10], wire_order[10];
- int i, temp_bits, err;
+ u32 analog_line[4];
+ u32 wire_order[4];
+ int i, temp_bits;
for (i = 0; i < 4; i++) {
/*
* Get the order in which TSC wires are attached
* w.r.t. each of the analog input lines on the EVM.
*/
- analog_line[i] = ts_dev->config_inp[i] & 0xF0;
- analog_line[i] = analog_line[i] >> 4;
-
+ analog_line[i] = (ts_dev->config_inp[i] & 0xF0) >> 4;
wire_order[i] = ts_dev->config_inp[i] & 0x0F;
+ if (WARN_ON(analog_line[i] > 4))
+ return -EINVAL;
+ if (WARN_ON(wire_order[i] > 4))
+ return -EINVAL;
}
for (i = 0; i < 4; i++) {
+ int an_line;
+ int wi_order;
+
+ an_line = analog_line[i];
+ wi_order = wire_order[i];
+ temp_bits = config[an_line][wi_order];
+ if (temp_bits == 0)
+ return -EINVAL;
switch (wire_order[i]) {
case 0:
- temp_bits = config[analog_line[i]][0];
- if (temp_bits == 0) {
- err = -EINVAL;
- goto ret;
- } else {
- ts_dev->bit_xp = regbit_map(temp_bits);
- ts_dev->inp_xp = analog_line[i];
- break;
- }
+ ts_dev->bit_xp = regbit_map(temp_bits);
+ ts_dev->inp_xp = analog_line[i];
+ break;
+
case 1:
- temp_bits = config[analog_line[i]][1];
- if (temp_bits == 0) {
- err = -EINVAL;
- goto ret;
- } else {
- ts_dev->bit_xn = regbit_map(temp_bits);
- ts_dev->inp_xn = analog_line[i];
- break;
- }
+ ts_dev->bit_xn = regbit_map(temp_bits);
+ ts_dev->inp_xn = analog_line[i];
+ break;
+
case 2:
- temp_bits = config[analog_line[i]][2];
- if (temp_bits == 0) {
- err = -EINVAL;
- goto ret;
- } else {
- ts_dev->bit_yp = regbit_map(temp_bits);
- ts_dev->inp_yp = analog_line[i];
- break;
- }
+ ts_dev->bit_yp = regbit_map(temp_bits);
+ ts_dev->inp_yp = analog_line[i];
+ break;
case 3:
- temp_bits = config[analog_line[i]][3];
- if (temp_bits == 0) {
- err = -EINVAL;
- goto ret;
- } else {
- ts_dev->bit_yn = regbit_map(temp_bits);
- ts_dev->inp_yn = analog_line[i];
- break;
- }
+ ts_dev->bit_yn = regbit_map(temp_bits);
+ ts_dev->inp_yn = analog_line[i];
+ break;
}
}
-
return 0;
-
-ret:
- return err;
}
static void titsc_step_config(struct titsc *ts_dev)
@@ -319,7 +304,6 @@ static irqreturn_t titsc_irq(int irq, void *dev)
unsigned int z1, z2, z;
unsigned int fsm;
unsigned int diffx = 0, diffy = 0;
- int i;
status = titsc_readl(ts_dev, REG_IRQSTATUS);
if (status & IRQENB_FIFO0THRES) {
@@ -387,11 +371,10 @@ static irqreturn_t titsc_irq(int irq, void *dev)
}
static int titsc_parse_dt(struct ti_tscadc_dev *tscadc_dev,
- struct titsc *ts_dev)
+ struct titsc *ts_dev)
{
struct device_node *node = tscadc_dev->dev->of_node;
- int err, i;
- u32 val32, wires_conf[4];
+ int err;
if (!node)
return -EINVAL;
@@ -399,34 +382,30 @@ static int titsc_parse_dt(struct ti_tscadc_dev *tscadc_dev,
node = of_get_child_by_name(node, "tsc");
if (!node)
return -EINVAL;
- err = of_property_read_u32(node, "ti,wires", &val32);
+ err = of_property_read_u32(node, "ti,wires", &ts_dev->wires);
if (err < 0)
- goto error_ret;
- ts_dev->wires = val32;
-
- err = of_property_read_u32(node,
- "ti,x-plate-resistance", &val32);
- if (err < 0)
- goto error_ret;
- ts_dev->x_plate_resistance = val32;
+ return err;
+ switch (ts_dev->wires) {
+ case 4:
+ case 5:
+ case 8:
+ break;
+ default:
+ return -EINVAL;
+ }
- err = of_property_read_u32(node,
- "ti,steps-to-configure", &val32);
+ err = of_property_read_u32(node, "ti,x-plate-resistance",
+ &ts_dev->x_plate_resistance);
if (err < 0)
- goto error_ret;
- ts_dev->steps_to_configure = val32;
+ return err;
- err = of_property_read_u32_array(node, "ti,wire-config",
- wires_conf, ARRAY_SIZE(wires_conf));
+ err = of_property_read_u32(node, "ti,steps-to-configure",
+ &ts_dev->steps_to_configure);
if (err < 0)
- goto error_ret;
+ return err;
- for (i = 0; i < ARRAY_SIZE(wires_conf); i++)
- ts_dev->config_inp[i] = wires_conf[i];
- return 0;
-
-error_ret:
- return err;
+ return of_property_read_u32_array(node, "ti,wire-config",
+ ts_dev->config_inp, ARRAY_SIZE(ts_dev->config_inp));
}
/*
@@ -545,7 +524,6 @@ static int titsc_resume(struct device *dev)
0x00);
titsc_writel(ts_dev, REG_IRQCLR, IRQENB_HW_PEN);
}
- titsc_config_wires(ts_dev);
titsc_step_config(ts_dev);
titsc_writel(ts_dev, REG_FIFO0THR,
ts_dev->steps_to_configure);
--
1.7.10.4
--
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