Add a debug switch which causes all messages from the touch controller to be
dumped to the dmesg log with a set prefix "MXT MSG:". This is used by Atmel
user-space utilities to debug touch operation. Enabling this output does
impact touch performance.
Signed-off-by: Nick Dyer <nick.d...@itdev.co.uk>
---
drivers/input/touchscreen/atmel_mxt_ts.c | 52 ++++++++++++++++++++++++++----
1 file changed, 45 insertions(+), 7 deletions(-)
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c
b/drivers/input/touchscreen/atmel_mxt_ts.c
index b4bc16f..08cd7ff 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -83,6 +83,9 @@
#define MXT_SPT_MESSAGECOUNT_T44 44
#define MXT_SPT_CTECONFIG_T46 46
+/* MXT_GEN_MESSAGE_T5 object */
+#define MXT_RPTID_NOMSG 0xff
+
/* MXT_GEN_COMMAND_T6 field */
#define MXT_COMMAND_RESET 0
#define MXT_COMMAND_BACKUPNV 1
@@ -264,6 +267,7 @@ struct mxt_data {
bool in_bootloader;
u16 mem_size;
struct bin_attribute mem_access_attr;
+ bool debug_enabled;
/* Cached parameters from object table */
u8 T6_reportid;
@@ -356,11 +360,10 @@ static bool mxt_object_writable(unsigned int type)
}
}
-static void mxt_dump_message(struct device *dev,
- struct mxt_message *message)
+static void mxt_dump_message(struct device *dev, struct mxt_message *message)
{
- dev_dbg(dev, "reportid: %u\tmessage: %*ph\n",
- message->reportid, 7, message->message);
+ dev_dbg(dev, "MXT MSG: %*ph\n",
+ sizeof(struct mxt_message), message);
}
static int mxt_wait_for_completion(struct mxt_data *data,
@@ -669,6 +672,7 @@ static irqreturn_t
mxt_process_messages_until_invalid(struct mxt_data *data)
struct device *dev = &data->client->dev;
u8 reportid;
bool update_input = false;
+ bool dump;
do {
if (mxt_read_message(data, &message)) {
@@ -677,6 +681,7 @@ static irqreturn_t
mxt_process_messages_until_invalid(struct mxt_data *data)
}
reportid = message.reportid;
+ dump = data->debug_enabled;
if (reportid == data->T6_reportid) {
u8 status = payload[0];
@@ -694,9 +699,12 @@ static irqreturn_t
mxt_process_messages_until_invalid(struct mxt_data *data)
mxt_input_button(data, &message);
update_input = true;
} else {
- mxt_dump_message(dev, &message);
+ dump = true;
}
- } while (reportid != 0xff);
+
+ if (dump)
+ mxt_dump_message(dev, &message);
+ } while (reportid != MXT_RPTID_NOMSG);
if (data->enable_reporting && update_input) {
input_mt_report_pointer_emulation(data->input_dev, false);
@@ -823,7 +831,7 @@ static int mxt_make_highchg(struct mxt_data *data)
error = mxt_read_message(data, &message);
if (error)
return error;
- } while (message.reportid != 0xff && --count);
+ } while (message.reportid != MXT_RPTID_NOMSG && --count);
if (!count) {
dev_err(dev, "CHG pin isn't cleared\n");
@@ -1210,6 +1218,33 @@ static ssize_t mxt_update_fw_store(struct device *dev,
return count;
}
+static ssize_t mxt_debug_enable_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct mxt_data *data = dev_get_drvdata(dev);
+ char c;
+
+ c = data->debug_enabled ? '1' : '0';
+ return scnprintf(buf, PAGE_SIZE, "%c\n", c);
+}
+
+static ssize_t mxt_debug_enable_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct mxt_data *data = dev_get_drvdata(dev);
+ int i;
+
+ if (sscanf(buf, "%u", &i) == 1 && i < 2) {
+ data->debug_enabled = (i == 1);
+
+ dev_dbg(dev, "%s\n", i ? "debug enabled" : "debug disabled");
+ return count;
+ } else {
+ dev_dbg(dev, "debug_enabled write error\n");
+ return -EINVAL;
+ }
+}
+
static int mxt_check_mem_access_params(struct mxt_data *data, loff_t off,
size_t *count)
{
@@ -1264,12 +1299,15 @@ static DEVICE_ATTR(fw_version, S_IRUGO,
mxt_fw_version_show, NULL);
static DEVICE_ATTR(hw_version, S_IRUGO, mxt_hw_version_show, NULL);
static DEVICE_ATTR(object, S_IRUGO, mxt_object_show, NULL);
static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mxt_update_fw_store);
+static DEVICE_ATTR(debug_enable, S_IWUSR | S_IRUSR, mxt_debug_enable_show,
+ mxt_debug_enable_store);
static struct attribute *mxt_attrs[] = {
&dev_attr_fw_version.attr,
&dev_attr_hw_version.attr,
&dev_attr_object.attr,
&dev_attr_update_fw.attr,
+ &dev_attr_debug_enable.attr,
NULL
};
--
1.7.10.4
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