| Message ID | 20200108111050.19001-2-m.felsch@pengutronix.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | EDT-FT5x06 improvements | expand |
On Wed, Jan 08, 2020 at 12:10:45PM +0100, Marco Felsch wrote: > From: Philipp Zabel <p.zabel@pengutronix.de> > > The EP0700MLP1 returns bogus data on the first register read access > (reading the threshold parameter from register 0x00): > > edt_ft5x06 2-0038: crc error: 0xfc expected, got 0x40 > > It ignores writes until then. This patch adds a dummy read after which > the number of sensors and parameter read/writes work correctly. > > Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> > Signed-off-by: Marco Felsch <m.felsch@pengutronix.de> > Tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> > Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Applied, thank you. > --- > drivers/input/touchscreen/edt-ft5x06.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c > index d61731c0037d..b87b1e074f62 100644 > --- a/drivers/input/touchscreen/edt-ft5x06.c > +++ b/drivers/input/touchscreen/edt-ft5x06.c > @@ -1050,6 +1050,7 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client, > { > const struct edt_i2c_chip_data *chip_data; > struct edt_ft5x06_ts_data *tsdata; > + u8 buf[2] = { 0xfc, 0x00 }; > struct input_dev *input; > unsigned long irq_flags; > int error; > @@ -1140,6 +1141,12 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client, > return error; > } > > + /* > + * Dummy read access. EP0700MLP1 returns bogus data on the first > + * register read access and ignores writes. > + */ > + edt_ft5x06_ts_readwrite(tsdata->client, 2, buf, 2, buf); > + > edt_ft5x06_ts_set_regs(tsdata); > edt_ft5x06_ts_get_defaults(&client->dev, tsdata); > edt_ft5x06_ts_get_parameters(tsdata); > -- > 2.20.1 >
diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c index d61731c0037d..b87b1e074f62 100644 --- a/drivers/input/touchscreen/edt-ft5x06.c +++ b/drivers/input/touchscreen/edt-ft5x06.c @@ -1050,6 +1050,7 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client, { const struct edt_i2c_chip_data *chip_data; struct edt_ft5x06_ts_data *tsdata; + u8 buf[2] = { 0xfc, 0x00 }; struct input_dev *input; unsigned long irq_flags; int error; @@ -1140,6 +1141,12 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client, return error; } + /* + * Dummy read access. EP0700MLP1 returns bogus data on the first + * register read access and ignores writes. + */ + edt_ft5x06_ts_readwrite(tsdata->client, 2, buf, 2, buf); + edt_ft5x06_ts_set_regs(tsdata); edt_ft5x06_ts_get_defaults(&client->dev, tsdata); edt_ft5x06_ts_get_parameters(tsdata);