linux-kernel - [PATCH 5/5] Input: tsc2005

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 22 Jul 2015 22:04:45 +0200
From:	Sebastian Reichel <sre@...nel.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org
Cc:	Michael Welling <mwelling@...cinc.com>, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, Sebastian Reichel <sre@...nel.org>
Subject: [PATCH 5/5] Input: tsc2005 - convert to gpiod

The GPIOD API can be used from boardcode, so that
the DT check can be removed. To avoid breaking
existing boardcode, _optional() variant has been
chosen. For completly removing the DT check, the
regulator has also been made optional, so that it
could be supplied from boardcode.

As a side-effect the patch fixes the after-probe
reset GPIO state, so that the device is not kept
in reset state.

Signed-off-by: Sebastian Reichel <sre@...nel.org>
---
 drivers/input/touchscreen/tsc2005.c | 47 ++++++++++++++-----------------------
 1 file changed, 18 insertions(+), 29 deletions(-)

diff --git a/drivers/input/touchscreen/tsc2005.c b/drivers/input/touchscreen/tsc2005.c
index f82b860..bf1b782 100644
--- a/drivers/input/touchscreen/tsc2005.c
+++ b/drivers/input/touchscreen/tsc2005.c
@@ -30,11 +30,11 @@
 #include <linux/delay.h>
 #include <linux/pm.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/tsc2005.h>
 #include <linux/regulator/consumer.h>
 #include <linux/regmap.h>
+#include <linux/gpio/consumer.h>
 
 /*
  * The touchscreen interface operates as follows:
@@ -180,7 +180,7 @@ struct tsc2005 {
 
 	struct regulator	*vio;
 
-	int			reset_gpio;
+	struct gpio_desc	*reset_gpio;
 	void			(*set_reset)(bool enable);
 };
 
@@ -318,8 +318,8 @@ static void tsc2005_stop_scan(struct tsc2005 *ts)
 
 static void tsc2005_set_reset(struct tsc2005 *ts, bool enable)
 {
-	if (ts->reset_gpio >= 0)
-		gpio_set_value(ts->reset_gpio, enable);
+	if (ts->reset_gpio)
+		gpiod_set_value_cansleep(ts->reset_gpio, enable);
 	else if (ts->set_reset)
 		ts->set_reset(enable);
 }
@@ -611,34 +611,23 @@ static int tsc2005_probe(struct spi_device *spi)
 	ts->x_plate_ohm = x_plate_ohm;
 	ts->esd_timeout = esd_timeout;
 
-	if (np) {
-		ts->reset_gpio = of_get_named_gpio(np, "reset-gpios", 0);
-		if (ts->reset_gpio == -EPROBE_DEFER)
-			return ts->reset_gpio;
-		if (ts->reset_gpio < 0) {
-			dev_err(&spi->dev, "error acquiring reset gpio: %d\n",
-				ts->reset_gpio);
-			return ts->reset_gpio;
-		}
+	ts->reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset",
+						 GPIOD_OUT_HIGH);
+	if (IS_ERR(ts->reset_gpio)) {
+		error = PTR_ERR(ts->reset_gpio);
+		dev_err(&spi->dev, "error acquiring reset gpio: %d\n", error);
+		return error;
+	}
 
-		error = devm_gpio_request_one(&spi->dev, ts->reset_gpio, 0,
-					      "reset-gpios");
-		if (error) {
-			dev_err(&spi->dev, "error requesting reset gpio: %d\n",
-				error);
-			return error;
-		}
+	ts->vio = devm_regulator_get_optional(&spi->dev, "vio");
+	if (IS_ERR(ts->vio)) {
+		error = PTR_ERR(ts->vio);
+		dev_err(&spi->dev, "vio regulator missing (%d)", error);
+		return error;
+	}
 
-		ts->vio = devm_regulator_get(&spi->dev, "vio");
-		if (IS_ERR(ts->vio)) {
-			error = PTR_ERR(ts->vio);
-			dev_err(&spi->dev, "vio regulator missing (%d)", error);
-			return error;
-		}
-	} else {
-		ts->reset_gpio = -1;
+	if(!ts->reset_gpio && pdata)
 		ts->set_reset = pdata->set_reset;
-	}
 
 	mutex_init(&ts->mutex);
 
-- 
2.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/