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Input: ads7846 - add support for the ads7843 touchscreen 

The ads7843 support has now become almost trivial since the last
rework.

Signed-off-by: Nicolas Ferre <nicolas.ferre@rfo.atmel.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Nicolas Ferre 2007-02-28 23:51:03 -05:00 committed by Dmitry Torokhov
parent bebb8a2bc1
commit 969111e900
1 changed files with 14 additions and 12 deletions
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26
drivers/input/touchscreen/ads7846.c
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@ -39,7 +39,8 @@
/*
* This code has been heavily tested on a Nokia 770, and lightly
* tested on other ads7846 devices (OSK/Mistral, Lubbock).
* Support for ads7843 and ads7845 has only been stubbed in.
* Support for ads7843 tested on Atmel at91sam926x-EK.
* Support for ads7845 has only been stubbed in.
*
* IRQ handling needs a workaround because of a shortcoming in handling
* edge triggered IRQs on some platforms like the OMAP1/2. These
@ -246,18 +247,16 @@ static int ads7846_read12_ser(struct device *dev, unsigned command)
/* REVISIT: take a few more samples, and compare ... */
/* maybe off internal vREF */
if (use_internal) {
req->ref_off = REF_OFF;
req->xfer[4].tx_buf = &req->ref_off;
req->xfer[4].len = 1;
spi_message_add_tail(&req->xfer[4], &req->msg);
/* converter in low power mode & enable PENIRQ */
req->ref_off = PWRDOWN;
req->xfer[4].tx_buf = &req->ref_off;
req->xfer[4].len = 1;
spi_message_add_tail(&req->xfer[4], &req->msg);
req->xfer[5].rx_buf = &req->scratch;
req->xfer[5].len = 2;
CS_CHANGE(req->xfer[5]);
spi_message_add_tail(&req->xfer[5], &req->msg);
}
req->xfer[5].rx_buf = &req->scratch;
req->xfer[5].len = 2;
CS_CHANGE(req->xfer[5]);
spi_message_add_tail(&req->xfer[5], &req->msg);
ts->irq_disabled = 1;
disable_irq(spi->irq);
@ -536,6 +535,9 @@ static void ads7846_rx(void *ads)
} else
Rt = 0;
if (ts->model == 7843)
Rt = ts->pressure_max / 2;
/* Sample found inconsistent by debouncing or pressure is beyond
* the maximum. Don't report it to user space, repeat at least
* once more the measurement