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. This does impact touch
performance somewhat.
Signed-off-by: Nick Dyer <nick.dyer@xxxxxxxxxxx>
---
drivers/input/touchscreen/atmel_mxt_ts.c | 57 +++++++++++++++++++++++++-----
1 file changed, 49 insertions(+), 8 deletions(-)
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 9cfb124..dad0be9 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -80,6 +80,9 @@
#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
@@ -257,6 +260,7 @@ struct mxt_data {
unsigned int max_x;
unsigned int max_y;
struct bin_attribute mem_access_attr;
+ bool debug_enabled;
/* Cached parameters from object table */
u8 T6_reportid;
@@ -329,11 +333,10 @@ 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_check_bootloader(struct i2c_client *client,
@@ -579,6 +582,7 @@ static irqreturn_t mxt_interrupt(int irq, void *dev_id)
struct device *dev = &data->client->dev;
u8 reportid;
bool update_input = false;
+ bool handled;
do {
if (mxt_read_message(data, &message)) {
@@ -587,20 +591,24 @@ static irqreturn_t mxt_interrupt(int irq, void *dev_id)
}
reportid = message.reportid;
+ handled = false;
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);
+ handled = true;
} 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 {
- mxt_dump_message(dev, &message);
+ handled = true;
}
- } while (reportid != 0xff);
+
+ if (!handled || data->debug_enabled)
+ mxt_dump_message(dev, &message);
+ } while (reportid != MXT_RPTID_NOMSG);
if (update_input) {
input_mt_report_pointer_emulation(data->input_dev, false);
@@ -719,7 +727,7 @@ 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");
@@ -1122,6 +1130,36 @@ 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);
+ int count;
+ char c;
+
+ c = data->debug_enabled ? '1' : '0';
+ count = sprintf(buf, "%c\n", c);
+
+ return count;
+}
+
+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)
{
@@ -1176,12 +1214,15 @@ 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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