linux-kernel - [PATCH] input/spi: add ads7843 support to ads7846 touchscreen driver

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Date:	Tue, 20 Feb 2007 10:19:43 +0100
From:	Nicolas Ferre <nicolas.ferre@....atmel.com>
To:	linux-kernel@...r.kernel.org, Dmitry Torokhov <dtor@...ightbb.com>
CC:	David Brownell <david-b@...bell.net>,
	Patrice Vilchez <patrice.vilchez@....atmel.com>,
	Andrew Victor <andrew@...people.com>, tony@...mide.com,
	imre.deak@...idboot.com
Subject: [PATCH] input/spi: add ads7843 support to ads7846 touchscreen driver

Add support for the ads7843 touchscreen controller to the ads7846
driver code.

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

Signed-off-by: Nicolas Ferre <nicolas.ferre@....atmel.com> 
---
Index: linux-2.6.20-at91/drivers/input/touchscreen/ads7846.c
===================================================================
--- linux-2.6.20-at91.orig/drivers/input/touchscreen/ads7846.c
+++ linux-2.6.20-at91/drivers/input/touchscreen/ads7846.c
@@ -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 dev
 
 	/* 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);
-
-		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);
-	}
+	/* 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);
 
 	ts->irq_disabled = 1;
 	disable_irq(spi->irq);
@@ -536,6 +535,10 @@ 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



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