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Input: atmel_mxt_ts - parse T6 reports 

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@chromium.org>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
This commit is contained in:
Daniel Kurtz 2012-06-28 21:08:24 +08:00 committed by Henrik Rydberg
parent 64464ae8e1
commit fdf804210f
1 changed files with 19 additions and 4 deletions
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23
drivers/input/touchscreen/atmel_mxt_ts.c
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@ -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)