linux-kernel - [PATCH] max730x: Added setup/teardown hooks

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Message-Id: <1297425606-13290-1-git-send-email-stigge@antcom.de>
Date:	Fri, 11 Feb 2011 13:00:06 +0100
From:	stigge@...com.de
To:	linux-kernel@...r.kernel.org, info@...gutronix.de
Cc:	Roland Stigge <stigge@...com.de>
Subject: [PATCH] max730x: Added setup/teardown hooks

max730x: Added setup/teardown hooks

This patch adds setup and teardown hooks for configuration of GPIO lines via
platform_data, similar to the pca953x driver.

Signed-off-by: Roland Stigge <stigge@...com.de>

diff --git a/drivers/gpio/max730x.c b/drivers/gpio/max730x.c
index 94ce773..ccd624d 100644
--- a/drivers/gpio/max730x.c
+++ b/drivers/gpio/max730x.c
@@ -219,6 +219,12 @@ int __devinit __max730x_probe(struct max7301 *ts)
 	if (ret)
 		goto exit_destroy;
 
+	if (pdata->setup) {
+		ret = pdata->setup(ts->chip.base,
+				ts->chip.ngpio, pdata->context);
+		if (ret < 0)
+			dev_warn(dev, "setup failed, %d\n", ret);
+	}
 	return ret;
 
 exit_destroy:
@@ -230,12 +236,24 @@ EXPORT_SYMBOL_GPL(__max730x_probe);
 
 int __devexit __max730x_remove(struct device *dev)
 {
+	struct max7301_platform_data *pdata;
 	struct max7301 *ts = dev_get_drvdata(dev);
 	int ret;
 
 	if (ts == NULL)
 		return -ENODEV;
 
+	pdata = dev->platform_data;
+
+	if (pdata && pdata->teardown) {
+		ret = pdata->teardown(ts->chip.base,
+				ts->chip.ngpio, pdata->context);
+		if (ret < 0) {
+			dev_err(dev, "teardown failed, %d\n", ret);
+			return ret;
+		}
+	}
+
 	dev_set_drvdata(dev, NULL);
 
 	/* Power down the chip and disable IRQ output */
diff --git a/include/linux/spi/max7301.h b/include/linux/spi/max7301.h
index bcaa2f7..02d685a 100644
--- a/include/linux/spi/max7301.h
+++ b/include/linux/spi/max7301.h
@@ -28,6 +28,13 @@ struct max7301_platform_data {
 	 * ports of the controller are not used, too.
 	 */
 	u32		input_pullup_active;
+
+	void		*context;	/* param to setup/teardown */
+
+	int		(*setup)(unsigned gpio, unsigned ngpio,
+				void *context);
+	int		(*teardown)(unsigned gpio, unsigned ngpio,
+				void *context);
 };
 
 extern int __max730x_remove(struct device *dev);
--
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