The normal messages sent after boot or NVRAM update are T6 reports,
containing a status, and the config memory checksum. Parse them and dump
a useful info message.
This patch tested on an MXT224E.
Signed-off-by: Daniel Kurtz <djkurtz@xxxxxxxxxxxx>
---
drivers/input/touchscreen/atmel_mxt_ts.c | 23 +++++++++++++++++++----
1 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 4c9a06c..37190ab 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -248,6 +248,7 @@ struct mxt_data {
unsigned int max_y;
/* Cached parameters from object table */
+ u8 T6_reportid;
u8 T9_reportid_min;
u8 T9_reportid_max;
};
@@ -549,6 +550,11 @@ static void mxt_input_touchevent(struct mxt_data *data,
}
}
+static unsigned mxt_extract_T6_csum(const u8 *csum)
+{
+ return csum[0] | (csum[1] << 8) | (csum[2] << 16);
+}
+
static bool mxt_is_T9_message(struct mxt_data *data, struct mxt_message *msg)
{
u8 id = msg->reportid;
@@ -559,8 +565,8 @@ static irqreturn_t mxt_interrupt(int irq, void *dev_id)
{
struct mxt_data *data = dev_id;
struct mxt_message message;
+ const u8 *payload = &message.message[0];
struct device *dev = &data->client->dev;
- int id;
u8 reportid;
bool update_input = false;
@@ -572,9 +578,13 @@ static irqreturn_t mxt_interrupt(int irq, void *dev_id)
reportid = message.reportid;
- id = reportid - data->T9_reportid_min;
-
- if (mxt_is_T9_message(data, &message)) {
+ if (reportid == data->T6_reportid) {
+ u8 status = payload[0];
+ unsigned csum = mxt_extract_T6_csum(&payload[1]);
+ dev_dbg(dev, "Status: %02x Config Checksum: %06x\n",
+ status, csum);
+ } else if (mxt_is_T9_message(data, &message)) {
+ int id = reportid - data->T9_reportid_min;
mxt_input_touchevent(data, &message, id);
update_input = true;
} else {
@@ -749,6 +759,9 @@ static int mxt_get_object_table(struct mxt_data *data)
object->instances + 1, min_id, max_id);
switch (object->type) {
+ case MXT_GEN_COMMAND_T6:
+ data->T6_reportid = min_id;
+ break;
case MXT_TOUCH_MULTI_T9:
data->T9_reportid_min = min_id;
data->T9_reportid_max = max_id;
@@ -763,8 +776,10 @@ static void mxt_free_object_table(struct mxt_data *data)
{
kfree(data->object_table);
data->object_table = NULL;
+ data->T6_reportid = 0;
data->T9_reportid_min = 0;
data->T9_reportid_max = 0;
+
}
static int mxt_initialize(struct mxt_data *data)
--
1.7.7.3
--
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