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59 lines
1.9 KiB
Diff
59 lines
1.9 KiB
Diff
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From 4c2cec3cfad183400f191413e4867f3f07273ed6 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Fri, 19 May 2023 18:16:58 +0100
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Subject: [PATCH] input: edt-ft5x06: Only read data for number of
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points reported
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Rather than always reading the maximum number of points supported
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by the chip (which may be as high as 10), read the number of
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active points first, and read data for just those.
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In most cases this will result in less data on the I2C bus,
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with only the maximum touch points taking more due to a second
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read that has to configure the start address.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/input/touchscreen/edt-ft5x06.c | 10 +++++++++-
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1 file changed, 9 insertions(+), 1 deletion(-)
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--- a/drivers/input/touchscreen/edt-ft5x06.c
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+++ b/drivers/input/touchscreen/edt-ft5x06.c
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@@ -220,6 +220,7 @@ static irqreturn_t edt_ft5x06_ts_isr(int
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offset = 5; /* where the actual touch data starts */
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tplen = 4; /* data comes in so called frames */
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crclen = 1; /* length of the crc data */
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+ datalen = tplen * tsdata->max_support_points + offset + crclen;
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break;
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case EDT_M09:
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@@ -230,6 +231,7 @@ static irqreturn_t edt_ft5x06_ts_isr(int
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offset = 3;
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tplen = 6;
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crclen = 0;
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+ datalen = 3;
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break;
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default:
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@@ -237,7 +239,6 @@ static irqreturn_t edt_ft5x06_ts_isr(int
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}
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memset(rdbuf, 0, sizeof(rdbuf));
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- datalen = tplen * tsdata->max_support_points + offset + crclen;
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error = edt_ft5x06_ts_readwrite(tsdata->client,
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sizeof(cmd), &cmd,
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@@ -267,6 +268,13 @@ static irqreturn_t edt_ft5x06_ts_isr(int
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* points.
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*/
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num_points = min(rdbuf[2] & 0xf, tsdata->max_support_points);
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+ if (num_points) {
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+ datalen = tplen * num_points + crclen;
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+ cmd = offset;
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+ error = edt_ft5x06_ts_readwrite(tsdata->client,
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+ sizeof(cmd), &cmd,
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+ datalen, &rdbuf[offset]);
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+ }
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}
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for (i = 0; i < num_points; i++) {
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