diff options
| author | Michael Hennerich <michael.hennerich@analog.com> | 2010-03-09 20:38:45 -0800 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2010-03-09 22:12:45 -0800 |
| commit | 06a09124b5ec65f81df66c56695d9a9ae04a0114 (patch) | |
| tree | 6ae81521962ce1d013d00ae1d6915e528d8dc638 /drivers/input/touchscreen/ads7846.c | |
| parent | 9e49f6c1339a7972e23a335c4c71a289b4c6f65b (diff) | |
Input: ads7846 - add support for AD7843 parts
The AD7873 is almost identical to the ADS7846; the only difference is
related to the Power Management bits PD0 and PD1. This results in a
slightly different PENIRQ enable behavior. For the AD7873, VREF should
be turned off during differential measurements.
So, add the AD7873/43 to the list of driver supported devices, and prevent
VREF usage during differential/ratiometric conversion modes.
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input/touchscreen/ads7846.c')
| -rw-r--r-- | drivers/input/touchscreen/ads7846.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c index 8b05d8e97543..d187be05955f 100644 --- a/drivers/input/touchscreen/ads7846.c +++ b/drivers/input/touchscreen/ads7846.c @@ -36,6 +36,7 @@ * TSC2046 is just newer ads7846 silicon. * Support for ads7843 tested on Atmel at91sam926x-EK. * Support for ads7845 has only been stubbed in. + * Support for Analog Devices AD7873 and AD7843 tested. * * IRQ handling needs a workaround because of a shortcoming in handling * edge triggered IRQs on some platforms like the OMAP1/2. These @@ -984,6 +985,15 @@ static int __devinit ads7846_probe(struct spi_device *spi) vref = pdata->keep_vref_on; + if (ts->model == 7873) { + /* The AD7873 is almost identical to the ADS7846 + * keep VREF off during differential/ratiometric + * conversion modes + */ + ts->model = 7846; + vref = 0; + } + /* set up the transfers to read touchscreen state; this assumes we * use formula #2 for pressure, not #3. */ |