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Input: edt-ft5x06 - show crc and header errors by sysfs 

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>
Link: https://lore.kernel.org/r/20220621123937.1330389-7-dario.binacchi@amarulasolutions.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dario Binacchi 2022-06-28 10:58:59 -07:00 committed by Dmitry Torokhov
parent 480343dc89
commit b777f93b6a
1 changed files with 30 additions and 0 deletions
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30
drivers/input/touchscreen/edt-ft5x06.c
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@ -134,6 +134,8 @@ 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 {
@ -182,6 +184,7 @@ 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]);
@ -239,6 +242,7 @@ 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]);
@ -553,6 +557,30 @@ 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 sysfs_emit(buf, "%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 sysfs_emit(buf, "%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,
@ -562,6 +590,8 @@ 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
};