[PATCH v3 6/6] Input: edt-ft5x06 - show crc and header errors by sysfs

Dario Binacchi
2022-03-13T16:35:47Z

M06 sends packets with header and crc for data verification. Now you can
check at runtime how many packets have been dropped.

Co-developed-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>

---

(no changes since v2)

Changes in v2:
- Add Oliver Graute's 'Acked-by' tag to:
* Input: edt-ft5x06 - show model name by sysfs
* Input: edt-ft5x06 - show firmware version by sysfs
- Fix yaml file. Tested with `make DT_CHECKER_FLAGS=-m dt_binding_check'.

drivers/input/touchscreen/edt-ft5x06.c | 30 ++++++++++++++++++++++++++
1 file changed, 30 insertions(+)

diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
index bab92344b2ea..3deb66d67469 100644
--- a/drivers/input/touchscreen/edt-ft5x06.c
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -133,6 +133,8 @@ struct edt_ft5x06_ts_data {

struct edt_reg_addr reg_addr;
enum edt_ver version;
+ unsigned int crc_errors;
+ unsigned int header_errors;
};

struct edt_i2c_chip_data {
@@ -181,6 +183,7 @@ static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata,
crc ^= buf[i];

if (crc != buf[buflen-1]) {
+ tsdata->crc_errors++;
dev_err_ratelimited(&tsdata->client->dev,
"crc error: 0x%02x expected, got 0x%02x\n",
crc, buf[buflen-1]);
@@ -238,6 +241,7 @@ static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id)
if (tsdata->version == EDT_M06) {
if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa ||
rdbuf[2] != datalen) {
+ tsdata->header_errors++;
dev_err_ratelimited(dev,
"Unexpected header: %02x%02x%02x!\n",
rdbuf[0], rdbuf[1], rdbuf[2]);
@@ -552,6 +556,30 @@ static ssize_t fw_version_show(struct device *dev,

static DEVICE_ATTR_RO(fw_version);

+/* m06 only */
+static ssize_t header_errors_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", tsdata->header_errors);
+}
+
+static DEVICE_ATTR_RO(header_errors);
+
+/* m06 only */
+static ssize_t crc_errors_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", tsdata->crc_errors);
+}
+
+static DEVICE_ATTR_RO(crc_errors);
+
static struct attribute *edt_ft5x06_attrs[] = {
&edt_ft5x06_attr_gain.dattr.attr,
&edt_ft5x06_attr_offset.dattr.attr,
@@ -561,6 +589,8 @@ static struct attribute *edt_ft5x06_attrs[] = {
&edt_ft5x06_attr_report_rate.dattr.attr,
&dev_attr_model.attr,
&dev_attr_fw_version.attr,
+ &dev_attr_header_errors.attr,
+ &dev_attr_crc_errors.attr,
NULL
};

--
2.32.0