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>

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 7208654..8a8fa4d 100644 (file)
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -24,17 +24,18 @@ config TOUCHSCREEN_88PM860X
          module will be called 88pm860x-ts.
 
 config TOUCHSCREEN_ADS7846
-       tristate "ADS7846/TSC2046 and ADS7843 based touchscreens"
+       tristate "ADS7846/TSC2046/AD7873 and AD(S)7843 based touchscreens"
        depends on SPI_MASTER
        depends on HWMON = n || HWMON
        help
          Say Y here if you have a touchscreen interface using the
-         ADS7846/TSC2046 or ADS7843 controller, and your board-specific
-         setup code includes that in its table of SPI devices.
+         ADS7846/TSC2046/AD7873 or ADS7843/AD7843 controller,
+         and your board-specific setup code includes that in its
+         table of SPI devices.
 
          If HWMON is selected, and the driver is told the reference voltage
          on your board, you will also get hwmon interfaces for the voltage
-         (and on ads7846/tsc2046, temperature) sensors of this chip.
+         (and on ads7846/tsc2046/ad7873, temperature) sensors of this chip.
 
          If unsure, say N (but it's safe to say "Y").
 

diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 8b05d8e..d187be0 100644 (file)
--- 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.
         */

diff --git a/include/linux/spi/ads7846.h b/include/linux/spi/ads7846.h
index 51948eb..5710c15 100644 (file)
--- a/include/linux/spi/ads7846.h
+++ b/include/linux/spi/ads7846.h
@@ -12,7 +12,7 @@ enum ads7846_filter {
 };
 
 struct ads7846_platform_data {
-       u16     model;                  /* 7843, 7845, 7846. */
+       u16     model;                  /* 7843, 7845, 7846, 7873. */
        u16     vref_delay_usecs;       /* 0 for external vref; etc */
        u16     vref_mv;                /* external vref value, milliVolts */
        bool    keep_vref_on;           /* set to keep vref on for differential