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input: edt-ft5x06: Only read data for number of points reported

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Rather than always reading the maximum number of points supported
by the chip (which may be as high as 10), read the number of
active points first, and read data for just those.
In most cases this will result in less data on the I2C bus,
with only the maximum touch points taking more due to a second
read that has to configure the start address.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
This commit is contained in:
Dave Stevenson
2023-05-19 18:16:58 +01:00
committed by Dom Cobley
parent a5e4c14408
commit 7216fcfe2e
1 changed files with 9 additions and 1 deletions
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10
drivers/input/touchscreen/edt-ft5x06.c
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@@ -330,6 +330,11 @@ static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
* points.
*/
num_points = min(rdbuf[2] & 0xf, tsdata->max_support_points);
if (num_points)
error = regmap_bulk_read(tsdata->regmap,
tsdata->offset,
&rdbuf[tsdata->tdata_offset],
tsdata->point_len * num_points);
}
for (i = 0; i < num_points; i++) {
@@ -1103,20 +1108,23 @@ static void edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata)
static void edt_ft5x06_ts_set_tdata_parameters(struct edt_ft5x06_ts_data *tsdata)
{
int crclen;
int points;
if (tsdata->version == EDT_M06) {
tsdata->tdata_cmd = 0xf9;
tsdata->tdata_offset = 5;
tsdata->point_len = 4;
crclen = 1;
points = tsdata->max_support_points;
} else {
tsdata->tdata_cmd = 0x0;
tsdata->tdata_offset = 3;
tsdata->point_len = 6;
crclen = 0;
points = 0;
}
tsdata->tdata_len = tsdata->point_len * tsdata->max_support_points +
tsdata->tdata_len = tsdata->point_len * points +
tsdata->tdata_offset + crclen;
}